| 摘要 |
A process for producing L-ascorbic acid or its sodium, potassium or calcium salt from 2-keto-L-gulonic acid or its sodium, potassium or calcium salt, or D-erythorbic acid or its sodium, potassium or calcium salt from 2-keto-D-gluconic acid or its sodium, potassium or calcium salt, comprising incubating 2-keto-L-gulonic acid or 2-keto-D-gluconic acid, each as the free acid or as its sodium, potassium or calcium salt, and cells of a thermoacidophilic microorganism at temperatures from about 30 DEG C to about 100 DEG C and at a pH from about 1 to about 6 in a solution to form L-ascorbic acid or D-erythorbic acid or an appropriate salt thereof, and isolating said L-ascorbic acid, D-erythorbic acid or appropriate salt thereof from the solution.
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