The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 2008
Filed:
Oct. 31, 2002
Applicants:
Tatsuo Hoshino, Kanagawa-ken, JP;
Tatsuya Kiyasu, Kanagawa-ken, JP;
Masako Shinjoh, Basel, CH;
Inventors:
Assignee:
DSM IP Assets B.V., TE Heerlen, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C12P 17/04 (2006.01); C07D 305/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
A process for producing L-ascorbic acid from 2-keto-L-gulonic acid or D-erythorbic acid from 2-keto-D-gluconic acid by contacting 2-keto-L-gulonic acid or 2-keto-D-gluconic acid, respectively, with an enzym having α-amylase activity in solution. The solvent for this reaction can be water, an aqueous alcohol, an organic solvent or a mixture thereof. In each case, the starting material can be in the form of the free acid, the sodium salt, or the calcium salt.