Patent ID: 9683228
Date: 2017-06-20
CPC Classifications: C12N,C12Y

Claim:
1. A method for stabilizing a cholesterol oxidase which comprises the steps of: preparing an aqueous solution of cholesterol oxidase; adding an α-keto acid or a salt thereof to the aqueous medium to prepare an aqueous solution comprising the α-keto acid or a salt thereof and the cholesterol oxidase; and preserving the aqueous solution comprising the α-keto acid or a salt thereof and the cholesterol oxidase at −5 to 45° C. for at least two weeks, wherein a concentration of the α-keto acid or a salt thereof in said aqueous solution is from 0.05 to 40 mmol/L, and the α-keto acid is selected from the group consisting of pyruvic acid, α-ketoglutaric acid and oxaloacetic acid.