Embodiments of the present invention are directed to an optical sensor capable of measuring two analytes simultaneously with a single indicator system. In preferred embodiments, the sensor comprises a fluorescent dye having acid and base forms that facilitate ratiometric pH sensing, wherein the dye is...http://www.google.fr/patents/US7751863?utm_source=gb-gplus-shareBrevet US7751863 - Optical determination of ph and glucose
