Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving oxidoreductase
Reexamination Certificate
2006-02-28
2006-02-28
Prats, Francisco (Department: 1651)
Chemistry: molecular biology and microbiology
Measuring or testing process involving enzymes or...
Involving oxidoreductase
C435S004000, C435S014000, C436S067000, C436S066000
Reexamination Certificate
active
07005273
ABSTRACT:
A method of determining the percentage of glycated hemoglobin in a blood sample is disclosed wherein at least one of the assay steps is performed electrochemically. The method includes determining the total amount of hemoglobin in a sample by electrochemically measuring, in an oxygen electroreduction reaction at a cathode, the amount of oxygen in the sample. Because the amount of oxygen dissolved in the sample is known, the total hemoglobin is determined by subtracting the amount of free oxygen from the total oxygen measured, recognizing the fast equilibrium Hb+O2⇄HbO2. This can be followed by determining the amount of glycated hemoglobin in the sample. The cathode reaction is accomplished by contacting the sample with an enzyme, the enzyme being a copper-containing enzyme having four copper ions per active unit. The family of these enzymes includes, for example, laccases and bilirubin oxidases.
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Parsons Hsue & de Runtz LLP
Prats Francisco
TheraSense Inc.
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