Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving glucose or galactose
Patent
1997-11-07
1999-10-19
Gitomer, R.
Chemistry: molecular biology and microbiology
Measuring or testing process involving enzymes or...
Involving glucose or galactose
422 55, 422 56, 422 57, C12Q 154
Patent
active
059687606
ABSTRACT:
A method for determining the presence of an analyte in a fluid is described along with various components of an apparatus specifically designed to carry out the method. The method involves taking a reflectance reading from one surface of an inert porous matrix impregnated with a reagent that will interact with the analyte to produce a light-absorbing reaction product when the fluid being analyzed is applied to another surface and migrates through the matrix to the surface being read. Reflectance measurements are made at two separate wavelengths in order to eliminate interferences, and a timing circuit is triggered by an initial decrease in reflectance by the wetting of the surface whose reflectance is being measured by the fluid which passes through the inert matrix. Repeatability in insured by a normalization technique performed on the light source before each reading, and an alignment method operated on the reagent strip prior to emplacement on the apparatus. The method and apparatus are particularly suitable for tho measurement of flucose levels in blood without requiring separation of red blood cells from serum or plasma.
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Jurik Franklin A.
McGarraugh Geoffery
Phillips Roger
Underwood Raymond D.
Gitomer R.
Lifescan Inc.
Riesenfeld James
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