Manufacture of l-ascorbic acid and d-erythorbic acid

Details Manufacture of l-ascorbic acid and d-erythorbic acid Manufacture of l-ascorbic acid and d-erythorbic acid

C - Chemistry, Metallurgy

12

P

C12P 17/04 (2006.01)

Patent

CA 2296020

A process for producing L-ascorbic acid (vitamin C) from 2-keto-L-gulonic acid or D-erythorbic acid from 2-keto-D-gluconic acid comprises contacting 2-keto-L- gulonic acid or 2-keto-D-gluconic acid, respectively, in solution with a lactonase, particularly one belonging to the enzyme class EC 3.1.1.x according to the classification of Enzyme Nomenclature. The solvent for this reaction can be water, an aqueous alcohol, a non-alcoholic organic solvent or a mixture of an aqueous alcohol and a non- alcoholic organic solvent. The contacting is generally performed in a temperature range of 0°C to 120°C and a pH range of 1.5 to 12. In each case the starting material can be in the form of the free acid, the sodium salt or the calcium salt. The so-produced vitamin C has very well known uses, and the alternatively produced D-erythorbic acid is useful as an antioxidant for food additives.

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