Fiber-optic detectors with terpolymeric analyte-permeable matrix coating
First Claim
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1. A fiber-optic blood analyte detector comprising:
- at least one fiber-optic filament with an end having a detecting element for immersion in blood to be analyzed, the detecting element comprising an analyte-permeable matrix for detecting analytes in said blood, the matrix comprising;
(i) a terpolymer of methyl methacrylate, butyl acrylate and methacrylamidopropyltrimethylammonium chloride; and
(ii) an indicator for analytes to be detected in blood;
wherein said matrix has a permeability to the analytes that allows detection of pH at t90% in less than about 150 seconds.
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Abstract
The invention provides fiber-optic detectors with rapid response times for measuring analytes in aqueous solutions, including blood. The detectors, because of their size, accuracy, and sterilizability may be used in vitro. In a preferred embodiment, pellets comprising a unique, permeable terpolymer of methyl methacrylate, butyl acrylate and methacrylamidopropyltrimethylammonium chloride; and an indicator for an analyte are used as the detecting element of a fiber-optic sensor. Response times for pH testing are better than 150 seconds at t90%. The pellets are easily made by solvent casting techniques and failure rates are low.
278 Citations
20 Claims
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1. A fiber-optic blood analyte detector comprising:
at least one fiber-optic filament with an end having a detecting element for immersion in blood to be analyzed, the detecting element comprising an analyte-permeable matrix for detecting analytes in said blood, the matrix comprising; (i) a terpolymer of methyl methacrylate, butyl acrylate and methacrylamidopropyltrimethylammonium chloride; and (ii) an indicator for analytes to be detected in blood; wherein said matrix has a permeability to the analytes that allows detection of pH at t90% in less than about 150 seconds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fiber-optic blood analyte detector comprising:
at least one fiber-optic filament with an end having a detecting element for immersion in blood to be analyzed;
the detecting element comprising an analyte-permeable matrix for detecting analytes in said blood, the matrix comprising a terpolymer comprising from about 85 to about 60 mole percent methyl methacrylate, from about 10 to about 25 mole percent butyl acrylate, and from about 5 to about 10 mole percent of methacrylarnidopropyltrimethylammonium chloride; and
an indicator for analytes to be detected in blood.- View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A fiber-optic detector for detecting changes in the pH of blood, comprising:
at least one fiber-optic filament with a detecting element at one end thereof for immersion in blood to be analyzed for pH;
the detecting element comprising;(i) an analyte-permeable matrix comprising a terpolymer of from about 85 to about 60 mole percent methyl methacrylate, from about 10 to about 25 mole percent butyl acrylate, and from about 5 to about 10 mole percent methacrylamidopropyltrimethylammonium chloride; and (ii) an indicator sensitive to and changing light reflected therefrom in response to changes in hydrogen ion concentration, wherein said matrix has a permeability to hydrogen ions that allows detection of pH at t90% in less than about 150 seconds. - View Dependent Claims (19, 20)
Specification