Chemical timer for a direct-reading reagent test strip

Details Chemical timer for a direct-reading reagent test strip Chemical timer for a direct-reading reagent test strip

C - Chemistry, Metallurgy

12

Q

C12Q 1/54 (2006.01) C12M 1/36 (2006.01) C12M 1/40 (2006.01) C12Q 1/26 (2006.01) G01N 33/52 (2006.01) G01N 33/558 (2006.01)

Patent

CA 2172681

A chemical timer for a direct-reading reagent test strip changes color a predetermined time after a biological fluid is applied to the strip. The strip measures the concentration of an analyte in the fluid. The timer is a dry coating of an indicator, a reagent that when hydrated can react with glucose to change the color of the indicator, an inhibitor to inhibit the change in color of the indicator, and glucose. Preferably, the reagent and glucose are present in excess in the coating, and the time it takes for the timer color to change can be controlled by the inhibitor concentration.

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