WO1988007203A1 - Polymer-coated optical structures - Google Patents

Polymer-coated optical structures Download PDF

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Publication number
WO1988007203A1
WO1988007203A1 PCT/GB1988/000177 GB8800177W WO8807203A1 WO 1988007203 A1 WO1988007203 A1 WO 1988007203A1 GB 8800177 W GB8800177 W GB 8800177W WO 8807203 A1 WO8807203 A1 WO 8807203A1
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WO
WIPO (PCT)
Prior art keywords
diffraction grating
binding partner
specific binding
ligand
light
Prior art date
Application number
PCT/GB1988/000177
Other languages
French (fr)
Inventor
Craig George Sawyers
Rosemary Ann Lucy Drake
Original Assignee
Ares-Serono Research & Development Limited Partner
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ares-Serono Research & Development Limited Partner filed Critical Ares-Serono Research & Development Limited Partner
Priority to AT88902173T priority Critical patent/ATE71730T1/en
Priority to US07/270,339 priority patent/US5310686A/en
Priority to DE8888902173T priority patent/DE3867765D1/en
Publication of WO1988007203A1 publication Critical patent/WO1988007203A1/en
Priority to NO884984A priority patent/NO175507C/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55Specular reflectivity
    • G01N21/552Attenuated total reflection
    • G01N21/553Attenuated total reflection and using surface plasmons
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47Scattering, i.e. diffuse reflection
    • G01N21/4788Diffraction
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/531Production of immunochemical test materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/54366Apparatus specially adapted for solid-phase testing
    • G01N33/54373Apparatus specially adapted for solid-phase testing involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/544Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being organic
    • G01N33/545Synthetic resin
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/551Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being inorganic
    • G01N33/553Metal or metal coated
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S436/00Chemistry: analytical and immunological testing
    • Y10S436/805Optical property

Definitions

  • the present invention relates to methods of producing polymer-coated surfaces suitable for use as optical structures.
  • it relates to methods of producing surfaces suitable for use in sensors, for example in biosensors in which one of a pair of binding partners is applied to the surface of a polymer-coated optical structure to form a device for detecting the presence of the complementary component in a sample subsequently brought into contact with the surface.
  • EP-0112721 describes the preparation, and use as biosensors, of metallised diffraction gratings coated with a material (hereinafter called “specific binding partner") capable of binding with the species to be assayed (hereinafter called "ligand”) to form a complex.
  • a material hereinafter called "specific binding partner”
  • ligand capable of binding with the species to be assayed
  • the supporting substrate of such optical structures is often of glass or plastics material but the surface of the structure, particularly where a surface plasmon resonance effect is desired, may comprise a thin metal layer formed, for example, by vacuum deposition.
  • Other inorganic layers e.g. silicon oxide have also been described as diffraction grating surfaces (see, for example, EP-0112721 and EP-0178083) .
  • silicon oxide does not provide complete protection against chemical attack, particularly if a silver layer is to be protected from attack by saline solutions.
  • the extent of the attack will depend on the thickness of the protective layer and the length of time of exposure to corrosive chemicals. For maximum assay sensitivity an appropriate uniform coating thickness must be provided in the range 10-200 nm. If the sensor is exposed to saline solutions for extended periods of time then it appears that ions can penetrate through the oxide or other layer to produce a tarnish on the silver which may eventually result in the removal of the protective layer thus reducing the usefulness of the device.
  • optical properties of an optical structure for example its reflection and/or transmission properties and any surface plasmon resonance effect exhibited, will depend on the composition, thickness and uniformity of any surface layers present; the composition of any such surface layers also governs - 3 - the chemical properties of the optical structure.
  • the range of chemical and physical properties of known inorganic layers is limited.
  • a still further problem which may occur when using such optical structures as biosensors is that some biologicall active materials, e.g. proteins, may be at least partially inactivated by direct contact with metallic and certain inorganic surfaces.
  • the invention provides a method of treating the surface of an optical structure which comprises forming on said surface a thin layer of a material which is capable of cross-polymerising on exposure to light or to heat. Subsequently the said material may be exposed to light or to heat whereby polymerisation occurs.
  • the layer of polymerised material on the surface of the optical structures will have a thickness in the range 10 to 200 nanometers.
  • the material used may be any suitable material which is capable of forming a thin uniform layer which cross-polymerises on exposure to light or to heat.
  • Suitable materials include thermo-polymerisable materials such as polyimide and photo-polymerisable materials such as photoresists e.g. positive, negative and electron (e ⁇ ) beam photoresists.
  • the material is a negative photoresist material such as is used extensively in semiconductor fabrication and mi ⁇ rolithography.
  • photoresist materials are designed to withstand chemical attack and have been found to not only protect the under ⁇ lying surface against such attack but also to protect it against ion penetration.
  • Negative photoresists are typical cyclized polyisoprene based, for example cyclised cis-1,4 polyisoprene.
  • Such material may be applied in a thin uniform layer to the surface of an optical structure in a convenient, well-controlled manner which lends itself to volume manufacture.
  • optical characteristics of an optical surface depend not only on its physical relief profile but also on the composition of the surface layer or layers.
  • the process of the present invention can be applied to produce novel coated optical structures which may prove to be useful tools for experimental physicists and the like.
  • certain preferred surface layers such as, for example, those capable of supporting surface plasmon resonance e.g. silver may be particularly susceptible to corrosion by, for example, aqueous environments; the present invention provides a means of passivating such a layer such that its integrity is maintained under practical working conditions.
  • the present invention is of particular advantage where the optical structures are diffraction gratings intended to be used as biosensors in a manner analogous to previous proposals (see, for example, EP-0112721) .
  • Direct contact between a biologically active material, such as, for example, an antibody or antigen, and a metallic surface may result in contamination or destruction of its biological activity.
  • the polymer layer conveniently acts as a barrier.
  • the wide range of chemical properties of different polymer surfaces e.g. availability of free groups for covalent bonding, hydrophilicity or hydrophobicity, surface charge and dielectric properties
  • any particular binding partner such as, for example, an antibody or an antigen. It is important to maintain the native conformation and biological activity of the desired binding partner and to obtain satisfactory immobilisation onto the surface of the optical structure whilst minimising any non-specific binding or steric hindrance.
  • the method of the present invention hence has particular . use in the preparation of biosensors and thus according to one embodiment of the present invention there is provided a method of preparing a device for the detection of a ligand which comprises: a) forming on the surface of an optical structure a thin layer of a material which is capable of cross-polymerising on exposure to light; b) exposing said material to light whereby polymerisation occurs; and c) adsorbing on or binding to said polymerised material, either directly or indirectly, a specific binding partner for the ligand it is desired to detect.
  • Biosensors produced in accordance with the invention are especially useful for the detection of antibodies or antigens (in which case the specific binding partner may be an antigen or an antibody, monoclonal or polyclonal, respectively) but other ligands may be detected by the use of other specific binding partners, as discussed hereinafter.
  • the sensors produced in accordance with the invention are not limited to biosensors and may comprise chemical sensors such as, for example, gaseous chemical detectors wherein specific adsorption 5 onto or absorption into the polymer layer may occur.
  • optical properties of an optical structure coated with a specific binding partner are altered by complex formation between the specific binding partner and the complementary ligand and, in one 0 embodiment of the invention, by comparing the optical characteristics of a standard (untreated) region with those of a treated test region of the surface it is possible to determine qualitatively or quantitatively whether a binding reaction has occurred in the 5 test region.
  • the specific binding partner is an antibody
  • an antibody specific to the antigen to be tested for is adsorbed on or bound to at least one discrete test region on the surface of an optical 0 structure and a protein which is not a specific binding partner for any ligand which may be present in the sample to be tested (denoted herein as a "non-specific protein") is adsorbed on or bound to at least one discrete reference region on said 5 surface.
  • the non-specific protein may be, for example, an inactivated antibody or an antibody raised against a ligand not present in the samples to be tested e.g. where the samples to be tested are human sera, the non-specific protein may be 0 an antirmouse antibody.
  • any differences between the non-specific binding of e.g. proteins present in the test sample to either the specific antibody or the non-specific protein can be determined by comparing the optical properties of the test region 5 with the reference region after exposure to a sample which does not contain the antigen to be tested for, so that an appropriate correction can, if - 7 - necessary, be made. Comparison of the optical characteristics of the test and standard regions of a similar biosensor during or after exposure to a sample to be tested can then provide a measurement 5 of complex formation between the antigen to be tested for and its specific antibody.
  • Each region may comprise a continuous layer of a specific binding partner or each binding partner may be present at discrete intervals within any given region to form a discontinuous layer.
  • the biosensors produced in accordance with the invention may, for example, be used in assays in ways analogous to those described in EP-0112721 and EP-0178083. Techniques for bonding specific binding partners to solid phase supports are described in the literature.
  • the binding partner may be bound to the polymer either directly or indirectly. Indirect binding may, for example, be effected by binding to the polymer a reagent Y which selectively interacts with a reagent Z provided on the specific binding partner.
  • the reagent Z may for example be such as to render the specific binding partner antigenic to reagent Y which in that case will be an antibody raised to Z.
  • Reagents Y and Z may for example be fluorescein isothiocyanate, rhodamine isothiocyanate, 2,4-dinitrofluorobenzene, phenyl isothiocyanate . or dansyl chloride.
  • Reagents Y and Z may alternatively be a specific binding protein and the corresponding ligand such as for example avidin and biotin.
  • the bonding of the specific binding partner, either directly or indirectly, to the polymer may be facilitated by activating the polymer layer, to provide free reactive groups for bonding.
  • an organo functional silane layer such as aminopropyltriethoxysilane may be applied followed by treatment with glutaraldehyde. This provides aldehyde groups on the surface of the optical structure which may covalently couple to amino groups present on proteins, or other entities comprising the specific binding partner.
  • a biosensor for detecting a ligand comprising an optical structure bearing a thin layer of a material which has been cross- polymerised by exposure to light or to heat, the said material having adsorbed thereon or bound thereto, either directly or indirectly, a specific binding partner for the ligand it is desired to detect.
  • the present invention further provides a method of detecting a ligand in a sample which comprises contacting said sample with a biosensor as described herein and determining whether, and if desired the extent to which and/or rate at which, an optical characteristic of the biosensor is altered by formation of a complex between the ligand and the specific binding partner.
  • the invention will be particularly described hereinafter with reference to an antibody or an antigen as the specific binding partner or ligand.
  • the invention is not to be taken as being limited to methods of preparing biosensors suitable for use in antibody or antigen assays but includes within its scope any sensors prepared by the process of the invention which can be used to detect any chemical, biochemical or biological species in a sample.
  • suitable binding partners which may be immobilised on an optical structure prepared by the process of the invention and of ligands which may be assayed by the method of the invention are given in Table I below. - 9 - Table I
  • the method of the invention has very broad applicability but in particular may be used to provide biosensors suitable for assaying: hormones, including peptide hormones (e.g. thyroid stimulating hormone (TSH) , luteinising hormone (LH) , human chorionic gonadotrophin (hCG) , follicle stimulating hormone (FSH) , insulin and prola ⁇ tin) and non-peptide hormones (e.g. steroid hormones such as cortisol, estradiol, progesterone and testosterone, or thyroid hormones such as thyroxine (T4) and triiodothyronine) , proteins (e.g. carcinoembryonic antigen (CEA) and alphafetoprotein (AFP)), drugs (e.g. digoxin) , sugars, toxins, vitamins, viruses, bacteria or microorganisms.
  • TSH thyroid stimulating hormone
  • LH luteinising hormone
  • hCG human chorionic gonadotrophin
  • FSH
  • any of the various classes or sub-classes of immunoglobulin e.g. IgG, IgM, derived from any of the animals conventionally used, e.g. sheep, rabbits, goats or mice, b) monoclonal antibodies, c) intact molecules or "fragments" of antibodies, monoclonal or polyclonal, the fragments being those which contain the binding region of the antibody, i.e. fragments devoid of the Fc portion (e.g., Fab, Fab', F(ab') 2 ) or the so-called "half-molecule" fragments obtained by reductive cleavage of the disulphide bonds connecting the heavy chain components in the intact antibody.
  • immunoglobulin e.g. IgG, IgM
  • monoclonal antibodies e.g. fragments devoid of the Fc portion (e.g., Fab, Fab', F(ab') 2 ) or the so-called "half-molecule" fragments obtained by reductive cle
  • antigen as used herein will be understood to include both permanently antigenic species (for example, proteins, bacteria, bacteria fragments, cells, cell fragments and viruses) and haptens which may be rendered antigenic under suitable conditions.
  • the invention will be described in more detail with reference to a preferred embodiment wherein the optical structure is a diffraction grating. However, it is to be understood that other optical structures such as, for example, optical waveguides, optical fibres and metal-coated prisms in the correct configuration to exhibit surface plasmon resonance, are all included within the scope of the invention. - 11 -
  • the supporting substrate of a diffraction grating may comprise glass or plastics material; polycarbonate is particularly preferred.
  • the diffraction grating may be formed in the surface of the supporting substrate which may be covered with, for example, a metal film, such as silver, gold, copper, nickel or aluminium, formed by a process of vapour deposition, electroplating, sputtering, coating, painting, spraying or otherwise.
  • a metal film such as silver, gold, copper, nickel or aluminium, formed by a process of vapour deposition, electroplating, sputtering, coating, painting, spraying or otherwise.
  • the metal surface is capable of supporting surface plasmon resonance, and more particularly is of silver, and the metallic film is deposited by vacuum deposition.
  • the metal film must be sufficiently thin, for example up to 50 nm for silver, so as not to unduly impede the passage of light therethrough.
  • the metal layer can be thicker, for example up to 500 nm, preferably around 100 nm for silver, and is preferably made sufficiently dense to provide a good reflecting surface on the diffraction grating pattern in the surface of the supporting substrate e.g. of plastics or glass.
  • a preferred method of applying a thin layer of a material which is capable of cross-polymerising on exposure to light, preferably a photoresist, to the surface of a metallised diffraction grating comprises the steps of:
  • securing the diffraction grating to the spinner preferably by means of a vacuum applied between the spinner and the diffraction grating; iii) applying a metered volume of a negative photoresist material or a solution of the negative photoresist material in a suitable solvent, for example in a mixture of xylene isomers to the surface of the diffraction grating;
  • the negative photoresist layer may be exposed, either directly or indirectly, to a solution containing a specific binding partner e.g. an antibody or an antigen such that adsorption or binding of the specific binding partner to the surface of the negative photoresist material occurs.
  • a specific binding partner e.g. an antibody or an antigen such that adsorption or binding of the specific binding partner to the surface of the negative photoresist material occurs.
  • a sheet of diffraction grating has an area greater than that required the sheet can be cut up into suitably sized parts.
  • the solvent must be compatible with the surface material of the diffraction grating - 13 - and must be readily removable by evaporation, for example by heating the coated " diffraction grating in an oven at a temperature of e.g. 80-120°C for a period of e.g. 10-60 minutes (using fume extraction equipment where appropriate) .
  • a further material may be applied to the negative photoresist layer to provide
  • the negative photoresist layer may be exposed to an organo functional silane such as aminopropyltriethoxysilane in a suitable solvent e.g. in aqueous solution and, after removing excess silane, any suitable activating agent e.g. glutaraldehyde can be added thereto. Subsequently any excess can be removed before exposing the activated surface of the diffraction grating to a specific binding partner for the ligand it is desired to detect.
  • organo functional silane such as aminopropyltriethoxysilane in a suitable solvent e.g. in aqueous solution
  • any suitable activating agent e.g. glutaraldehyde
  • Biological materials for example, sheep serum proteins, ribonucleases and immunoglobulins, have been found to bind very efficiently to some polymers. Simple addition of an aqueous protein solution at room temperature or lower has resulted in bound protein which could not easily be removed by washing with water, buffer solutions or detergents.
  • a monomeric material is allowed to diffuse into the light-induced polymer affixed to the diffracti grating.
  • the monomer is then polymerised to give a network of the second polymer entangled in the first, affixed polymer.
  • the second polymer is chosen to have chemical groups that are reactive towards protein or other biological materials.
  • a further protective barrier coating may be applied to protect the coatings so far applied or, if appropriate, the coated substrate may be freeze-dried or simply dried to allow the sensor to be stored dry.
  • a preferred method of applying a thin layer of a material which is capable of cross-polymerising on exposure to heat, preferably polyimide, onto a glass surface comprises the steps of:

Abstract

A method of treating the surface of an optical structure which comprises forming on said surface a thin layer of a material which is capable of cross-polymerising on exposure to light and subsequently exposing said material to light whereby polymerisation occurs. Preferably the process includes the subsequent treatment of the polymer layer with a solution of a specific ligand. Complex formation between the bound ligand and its specific binding partner present in a sample to be analysed alters the optical properties of the diffraction grating surface and the change can form the basis of an assay method.

Description

Polymer-coated optical structures
The present invention relates to methods of producing polymer-coated surfaces suitable for use as optical structures. In particular it relates to methods of producing surfaces suitable for use in sensors, for example in biosensors in which one of a pair of binding partners is applied to the surface of a polymer-coated optical structure to form a device for detecting the presence of the complementary component in a sample subsequently brought into contact with the surface.
The properties of simple optical structures have been known for many years and structures such as, for example, diffraction gratings have widespread use, not only as tools for understanding and analysing the wave properties of electromagnetic radiation but also, more recently, as sensors for detecting chemical, biochemical or biological species in a sample. US-3926564 and US-3979184 both describe the adsorption of immunologically reactive proteins onto rough metallic surfaces such that binding of a complementary component changes the optical properties of the surface in a manner detectable by the unaided eye.
EP-0112721 describes the preparation, and use as biosensors, of metallised diffraction gratings coated with a material (hereinafter called "specific binding partner") capable of binding with the species to be assayed (hereinafter called "ligand") to form a complex. The optical properties of such diffraction gratings are altered as a result of complex formation between the specific binding partner and the ligand and this phenomenon can consequently form the basis of an assay system.
A problem common not only to the use of coated optical structures as biosensors but also to the use of standard optical structures by experimental physicists, is the difficulty of controlling their surface properties. The supporting substrate of such optical structures is often of glass or plastics material but the surface of the structure, particularly where a surface plasmon resonance effect is desired, may comprise a thin metal layer formed, for example, by vacuum deposition. Problems can arise with the use of metal-coated surfaces in corrosive environments which may destroy the integrity of a metal layer. Other inorganic layers e.g. silicon oxide have also been described as diffraction grating surfaces (see, for example, EP-0112721 and EP-0178083) . However, it has been observed that silicon oxide does not provide complete protection against chemical attack, particularly if a silver layer is to be protected from attack by saline solutions. The extent of the attack will depend on the thickness of the protective layer and the length of time of exposure to corrosive chemicals. For maximum assay sensitivity an appropriate uniform coating thickness must be provided in the range 10-200 nm. If the sensor is exposed to saline solutions for extended periods of time then it appears that ions can penetrate through the oxide or other layer to produce a tarnish on the silver which may eventually result in the removal of the protective layer thus reducing the usefulness of the device.
Certain of the optical properties of an optical structure, for example its reflection and/or transmission properties and any surface plasmon resonance effect exhibited, will depend on the composition, thickness and uniformity of any surface layers present; the composition of any such surface layers also governs - 3 - the chemical properties of the optical structure. However, the range of chemical and physical properties of known inorganic layers is limited. A still further problem which may occur when using such optical structures as biosensors is that some biologicall active materials, e.g. proteins, may be at least partially inactivated by direct contact with metallic and certain inorganic surfaces.
In contrast, an extremely wide range of chemical and physical properties can be achieved by using appropriate organic polymers and a large number of techniques are known for bonding thereto or adsorbing thereon chemical, biochemical and biological entities. Unfortunately, previous attempts to prepare polymer- coated diffraction gratings have resulted in the polymer coating failing to conform adequately to the surface relief profile of the grating thereby grossly distorting its inherent physical properties.
We have now found that by using a material which is capable of cross-polymerising on exposure to light or to heat it is possible to prepare an optical structure having a uniformly distributed surface layer of organic polymer which conforms well to the surface relief profile of the optical structure. This layer provides an appropriate surface to resist chemical attack, and thus to protect any underlying metal layer, and for the optional attachment of a specific binding partner thereto. Thus, in its broadest aspect, the invention provides a method of treating the surface of an optical structure which comprises forming on said surface a thin layer of a material which is capable of cross-polymerising on exposure to light or to heat. Subsequently the said material may be exposed to light or to heat whereby polymerisation occurs. In general, the layer of polymerised material on the surface of the optical structures will have a thickness in the range 10 to 200 nanometers. The material used may be any suitable material which is capable of forming a thin uniform layer which cross-polymerises on exposure to light or to heat.
Suitable materials include thermo-polymerisable materials such as polyimide and photo-polymerisable materials such as photoresists e.g. positive, negative and electron (e~) beam photoresists. Preferably the material is a negative photoresist material such as is used extensively in semiconductor fabrication and miσrolithography. Such photoresist materials are designed to withstand chemical attack and have been found to not only protect the under¬ lying surface against such attack but also to protect it against ion penetration. Negative photoresists are typical cyclized polyisoprene based, for example cyclised cis-1,4 polyisoprene. Such material may be applied in a thin uniform layer to the surface of an optical structure in a convenient, well-controlled manner which lends itself to volume manufacture.
As mentioned previously the optical characteristics of an optical surface depend not only on its physical relief profile but also on the composition of the surface layer or layers. Thus, the process of the present invention can be applied to produce novel coated optical structures which may prove to be useful tools for experimental physicists and the like. In addition, certain preferred surface layers such as, for example, those capable of supporting surface plasmon resonance e.g. silver may be particularly susceptible to corrosion by, for example, aqueous environments; the present invention provides a means of passivating such a layer such that its integrity is maintained under practical working conditions.
However, the present invention is of particular advantage where the optical structures are diffraction gratings intended to be used as biosensors in a manner analogous to previous proposals (see, for example, EP-0112721) . Direct contact between a biologically active material, such as, for example, an antibody or antigen, and a metallic surface may result in contamination or destruction of its biological activity. In this situation the polymer layer conveniently acts as a barrier. Furthermore, the wide range of chemical properties of different polymer surfaces (e.g. availability of free groups for covalent bonding, hydrophilicity or hydrophobicity, surface charge and dielectric properties) provide versatility and scope for optimising the binding or adsorption of any particular binding partner, such as, for example, an antibody or an antigen. It is important to maintain the native conformation and biological activity of the desired binding partner and to obtain satisfactory immobilisation onto the surface of the optical structure whilst minimising any non-specific binding or steric hindrance.
The method of the present invention hence has particular.use in the preparation of biosensors and thus according to one embodiment of the present invention there is provided a method of preparing a device for the detection of a ligand which comprises: a) forming on the surface of an optical structure a thin layer of a material which is capable of cross-polymerising on exposure to light; b) exposing said material to light whereby polymerisation occurs; and c) adsorbing on or binding to said polymerised material, either directly or indirectly, a specific binding partner for the ligand it is desired to detect.
Biosensors produced in accordance with the invention are especially useful for the detection of antibodies or antigens (in which case the specific binding partner may be an antigen or an antibody, monoclonal or polyclonal, respectively) but other ligands may be detected by the use of other specific binding partners, as discussed hereinafter. However, - 6 - the sensors produced in accordance with the invention are not limited to biosensors and may comprise chemical sensors such as, for example, gaseous chemical detectors wherein specific adsorption 5 onto or absorption into the polymer layer may occur. The optical properties of an optical structure coated with a specific binding partner are altered by complex formation between the specific binding partner and the complementary ligand and, in one 0 embodiment of the invention, by comparing the optical characteristics of a standard (untreated) region with those of a treated test region of the surface it is possible to determine qualitatively or quantitatively whether a binding reaction has occurred in the 5 test region. In an alternative embodiment where, for example, the specific binding partner is an antibody, an antibody specific to the antigen to be tested for is adsorbed on or bound to at least one discrete test region on the surface of an optical 0 structure and a protein which is not a specific binding partner for any ligand which may be present in the sample to be tested (denoted herein as a "non-specific protein") is adsorbed on or bound to at least one discrete reference region on said 5 surface. The non-specific protein may be, for example, an inactivated antibody or an antibody raised against a ligand not present in the samples to be tested e.g. where the samples to be tested are human sera, the non-specific protein may be 0 an antirmouse antibody. Any differences between the non-specific binding of e.g. proteins present in the test sample to either the specific antibody or the non-specific protein can be determined by comparing the optical properties of the test region 5 with the reference region after exposure to a sample which does not contain the antigen to be tested for, so that an appropriate correction can, if - 7 - necessary, be made. Comparison of the optical characteristics of the test and standard regions of a similar biosensor during or after exposure to a sample to be tested can then provide a measurement 5 of complex formation between the antigen to be tested for and its specific antibody. Each region may comprise a continuous layer of a specific binding partner or each binding partner may be present at discrete intervals within any given region to form a discontinuous layer.
The biosensors produced in accordance with the invention may, for example, be used in assays in ways analogous to those described in EP-0112721 and EP-0178083. Techniques for bonding specific binding partners to solid phase supports are described in the literature. The binding partner may be bound to the polymer either directly or indirectly. Indirect binding may, for example, be effected by binding to the polymer a reagent Y which selectively interacts with a reagent Z provided on the specific binding partner. In such cases, the reagent Z may for example be such as to render the specific binding partner antigenic to reagent Y which in that case will be an antibody raised to Z. Z may for example be fluorescein isothiocyanate, rhodamine isothiocyanate, 2,4-dinitrofluorobenzene, phenyl isothiocyanate . or dansyl chloride. Reagents Y and Z may alternatively be a specific binding protein and the corresponding ligand such as for example avidin and biotin.
It is a desirable but not an essential feature of the invention to provide covalent bonding of the binding partner to the polymer.
The bonding of the specific binding partner, either directly or indirectly, to the polymer may be facilitated by activating the polymer layer, to provide free reactive groups for bonding. Thus, for example an organo functional silane layer such as aminopropyltriethoxysilane may be applied followed by treatment with glutaraldehyde. This provides aldehyde groups on the surface of the optical structure which may covalently couple to amino groups present on proteins, or other entities comprising the specific binding partner.
Thus according to a further aspect of the invention there is provided a biosensor for detecting a ligand comprising an optical structure bearing a thin layer of a material which has been cross- polymerised by exposure to light or to heat, the said material having adsorbed thereon or bound thereto, either directly or indirectly, a specific binding partner for the ligand it is desired to detect.
The present invention further provides a method of detecting a ligand in a sample which comprises contacting said sample with a biosensor as described herein and determining whether, and if desired the extent to which and/or rate at which, an optical characteristic of the biosensor is altered by formation of a complex between the ligand and the specific binding partner.
The invention will be particularly described hereinafter with reference to an antibody or an antigen as the specific binding partner or ligand. However, the invention is not to be taken as being limited to methods of preparing biosensors suitable for use in antibody or antigen assays but includes within its scope any sensors prepared by the process of the invention which can be used to detect any chemical, biochemical or biological species in a sample. Examples of suitable binding partners which may be immobilised on an optical structure prepared by the process of the invention and of ligands which may be assayed by the method of the invention are given in Table I below. - 9 - Table I
Ligand Specific Binding Partner
antigen specific antibody antibody antigen hormone hormone receptor hormone receptor hormone polynucleotide complementary polynucleotide strand strand avidin biotin biotin avidin protein A immunoglobulin immunoglobulin protein A enzyme enzyme cofactor (substrate) or inhibitor enzyme cofactor enzyme
(substrate) or inhibitor leσtins specific carbohydrate specific carbohydrate lectins of lectins
The method of the invention has very broad applicability but in particular may be used to provide biosensors suitable for assaying: hormones, including peptide hormones (e.g. thyroid stimulating hormone (TSH) , luteinising hormone (LH) , human chorionic gonadotrophin (hCG) , follicle stimulating hormone (FSH) , insulin and prolaσtin) and non-peptide hormones (e.g. steroid hormones such as cortisol, estradiol, progesterone and testosterone, or thyroid hormones such as thyroxine (T4) and triiodothyronine) , proteins (e.g. carcinoembryonic antigen (CEA) and alphafetoprotein (AFP)), drugs (e.g. digoxin) , sugars, toxins, vitamins, viruses, bacteria or microorganisms.
It will be understood that the term "antibody" used herein includes within its scope
a) any of the various classes or sub-classes of immunoglobulin, e.g. IgG, IgM, derived from any of the animals conventionally used, e.g. sheep, rabbits, goats or mice, b) monoclonal antibodies, c) intact molecules or "fragments" of antibodies, monoclonal or polyclonal, the fragments being those which contain the binding region of the antibody, i.e. fragments devoid of the Fc portion (e.g., Fab, Fab', F(ab')2) or the so-called "half-molecule" fragments obtained by reductive cleavage of the disulphide bonds connecting the heavy chain components in the intact antibody.
The method of preparation of fragments of antibodies is well known in the art and will not be described herein.
The term "antigen" as used herein will be understood to include both permanently antigenic species (for example, proteins, bacteria, bacteria fragments, cells, cell fragments and viruses) and haptens which may be rendered antigenic under suitable conditions. The invention will be described in more detail with reference to a preferred embodiment wherein the optical structure is a diffraction grating. However, it is to be understood that other optical structures such as, for example, optical waveguides, optical fibres and metal-coated prisms in the correct configuration to exhibit surface plasmon resonance, are all included within the scope of the invention. - 11 -
As previously mentioned, the supporting substrate of a diffraction grating may comprise glass or plastics material; polycarbonate is particularly preferred. The diffraction grating may be formed in the surface of the supporting substrate which may be covered with, for example, a metal film, such as silver, gold, copper, nickel or aluminium, formed by a process of vapour deposition, electroplating, sputtering, coating, painting, spraying or otherwise. Preferably the metal surface is capable of supporting surface plasmon resonance, and more particularly is of silver, and the metallic film is deposited by vacuum deposition.
Where the diffraction grating is to be used in an optical transmission mode, the metal film must be sufficiently thin, for example up to 50 nm for silver, so as not to unduly impede the passage of light therethrough. Where the diffraction grating is to be used in a reflective mode, then the metal layer can be thicker, for example up to 500 nm, preferably around 100 nm for silver, and is preferably made sufficiently dense to provide a good reflecting surface on the diffraction grating pattern in the surface of the supporting substrate e.g. of plastics or glass.
A preferred method of applying a thin layer of a material which is capable of cross-polymerising on exposure to light, preferably a photoresist, to the surface of a metallised diffraction grating comprises the steps of:
i) locating the diffraction grating, with the optical surface uppermost, on a spinner;
ii) securing the diffraction grating to the spinner, preferably by means of a vacuum applied between the spinner and the diffraction grating; iii) applying a metered volume of a negative photoresist material or a solution of the negative photoresist material in a suitable solvent, for example in a mixture of xylene isomers to the surface of the diffraction grating;
iv) spinning the diffraction grating secured to the spinner, for example at several thousand r.p.m. for a period of e.g. 30 seconds, such that the negative photoresist material or the solution thereof is distributed as a thin uniform layer over the surface of the diffraction grating;
v) if required, heating the diffraction grating such that any solvent remaining in the negative photoresist layer evaporates; and
vi) exposing the negative photoresist layer to light such that polymerisation, preferably polymerisation of substantially all reactive groups in the negative photoresist material, occurs.
Subsequently, if desired, the negative photoresist layer may be exposed, either directly or indirectly, to a solution containing a specific binding partner e.g. an antibody or an antigen such that adsorption or binding of the specific binding partner to the surface of the negative photoresist material occurs.
Where a sheet of diffraction grating has an area greater than that required the sheet can be cut up into suitably sized parts. It will be appreciated that where a solution of photoresist material is used the solvent must be compatible with the surface material of the diffraction grating - 13 - and must be readily removable by evaporation, for example by heating the coated" diffraction grating in an oven at a temperature of e.g. 80-120°C for a period of e.g. 10-60 minutes (using fume extraction equipment where appropriate) .
Binding of Biological Materials to the Polymer Surface
Three different methods of coupling biological materials to a polymer surface on a diffraction grating, have been considered: a) covalent bonding b) non-covalent adsorption c) covalent bonding of the biological material to a second polymer which is entrapped within the first polymer.
a) Covalent Bonding
Established procedures exist for covalently bonding biological materials, such as proteins, to polymers. Published procedures include the use of chemical reagents which modify the polymer unit to form reactive groups which covalently bind to typical protein groups such as, for example, free amino groups.
Commonly used chemical reagents include:
- cyanogen bromide
- tosyl chloride - titanium complexes
- carbodiimide cyanuric chloride
- oxirane
- periodate.
Alternatively, a further material may be applied to the negative photoresist layer to provide
Figure imgf000016_0001
- 14 - appropriate bonding groups for subsequent covalent coupling. Thus, for example, the negative photoresist layer may be exposed to an organo functional silane such as aminopropyltriethoxysilane in a suitable solvent e.g. in aqueous solution and, after removing excess silane, any suitable activating agent e.g. glutaraldehyde can be added thereto. Subsequently any excess can be removed before exposing the activated surface of the diffraction grating to a specific binding partner for the ligand it is desired to detect.
b) Non-Covalent Adsorption
Biological materials, for example, sheep serum proteins, ribonucleases and immunoglobulins, have been found to bind very efficiently to some polymers. Simple addition of an aqueous protein solution at room temperature or lower has resulted in bound protein which could not easily be removed by washing with water, buffer solutions or detergents.
c) Reactive Polymer Entrapment
This procedure separates the two important functions of the diffraction grating layer
- adhesion and conformation to the grating surface
- reactivity towards protein or other biological material or binding partner and meets each requirement with a separate polymer.
A monomeric material is allowed to diffuse into the light-induced polymer affixed to the diffracti grating. The monomer is then polymerised to give a network of the second polymer entangled in the first, affixed polymer. The second polymer is chosen to have chemical groups that are reactive towards protein or other biological materials.
Where a sensor (either before or after the adsorbtion thereon or binding thereto of a specific binding partner e.g. an antibody) is to be stored for a period of time, a further protective barrier coating may be applied to protect the coatings so far applied or, if appropriate, the coated substrate may be freeze-dried or simply dried to allow the sensor to be stored dry. A preferred method of applying a thin layer of a material which is capable of cross-polymerising on exposure to heat, preferably polyimide, onto a glass surface comprises the steps of:
1) washing glass surface for 60 minutes in a de- ionised water weir;
2) washing in 10% Decon 90 Ultrasonic tank for 7 minutes;
3) wash with de-ionised water; 4) spin dry in FSI rinser drier;
5) dry for 3 hours at 100°C;
6) treat surface with standard silane coupling reagent;
7) spin on standard polyimide e.g. NOLIMID 32; 8) conveyor baking at approximately 130°C for
5 minutes; and 9) final bake for 1 hour at 200°C.

Claims

Claims
1. A method of treating the surface of an optical structure which comprises forming on said surface a thin layer of a material which is capable of cross-polymerising on exposure to light or to heat.
2. A method as claimed in claim 1 wherein the said material is subsequently exposed to light or to heat whereby polymerisation occurs.
3. A method of preparing a device for the detection of a ligand which comprises: a) forming on the surface of an optical structure a thin layer of a material which is capable of cross-polymerising on exposure to light; b) exposing said material to light whereby polymer¬ isation occurs; and c) adsorbing on or binding to said polymerised material, either directly or indirectly, a specific binding partner for the ligand it is desired to detect.
4. A method as claimed in claim 3 wherein the specific binding partner is an antigen or an antibody.
5. A method as claimed in any one of the preceding claims wherein the optical structure is a diffraction grating.
6. A method as claimed in any one of claims 2 to 5 wherein the cross-polymerised material is cyclised cis-1,4-polyisoprene.
7. A method as claimed in any one of claims 2. to 6 wherein the layer of cross-polymerised material is 10 to 200 nanometers thick.
Figure imgf000019_0001
- 17 -
8. A method as claimed in any one of the preceding claims wherein the surface of the optical structure is capable of exhibiting surface plasmon resonance.
9. A method of applying a thin layer of a material which is capable of cross-polymerising on exposure to light to the surface of a metallised diffraction grating which comprises the steps of:-
i) locating the diffraction grating, with the optical surface uppermost, on a spinner;
ii) securing the diffraction grating to the. spinner;
iii) applying a metered volume of a negative photoresist material or a solution of the negati photoresist material in a suitable solvent," to the surface of the diffraction grating;
iv) spinning the diffraction grating secured to the spinner such that the negative photoresis material or the solution thereof distributes as a thin layer over the surface of the diffraction grating;
v) if required, heating the diffraction grating such that any solvent remaining in the negative photoresist layer evaporates; and
vi) exposing the negative photoresist layer to light such that polymerisation occurs.
10. A method as claimed in claim 9 wherein the diffraction grating is secured to the spinner by means of a vacuum applied between the spinner and the diffraction grating.
11. A method as claimed in claim 9 or claim 10 which further comprises the step of:-
vii) exposing, either directly or indirectly, the negative photoresist layer to a solution containing a specific binding partner such that adsorption or binding of the specific binding partner to the surface of the negative photoresist material occurs.
12. A biosensor for detecting a ligand comprising an optical structure bearing a thin layer of a material which has been cross-polymerised by exposure to light or to heat, the said material having adsorbed -thereon or bound thereto, either directly or indirectly, a specific binding partner for the ligand it is desired to detect.
13. A biosensor as claimed in claim 12 wherein the optical structure is a diffraction grating.
14. A method of detecting a ligand in a sample which comprises contacting said sample with a biosensor as claimed in claim 12 or claim 13 and determining whether, and if desired the extent to which and/or rate at which, an optical characteristic of the biosensor is altered by formation of a complex between the ligand and the specific binding partner.
PCT/GB1988/000177 1987-03-10 1988-03-09 Polymer-coated optical structures WO1988007203A1 (en)

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DE8888902173T DE3867765D1 (en) 1987-03-10 1988-03-09 POLYMER COATED OPTICAL STRUCTURES.
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ATE71730T1 (en) 1992-02-15
JPH01502935A (en) 1989-10-05
NO884984D0 (en) 1988-11-09
CA1339409C (en) 1997-09-02
NO175507B (en) 1994-07-11
NO175507C (en) 1994-10-19
GB8705649D0 (en) 1987-04-15
DE3867765D1 (en) 1992-02-27
EP0305439A1 (en) 1989-03-08
JP2710243B2 (en) 1998-02-10
EP0305439B1 (en) 1992-01-15
AU613352B2 (en) 1991-08-01
NO884984L (en) 1988-11-09
US5310686A (en) 1994-05-10
AU1391088A (en) 1988-10-10

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