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US 5,630,923 AGranted
Separation system for preparing high .alpha.-glycosyl-L-ascorbic acid
AssigneeKabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo
InventorsHajime Aga, Masaru Yoneyama, Shuzo Sakai
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Abstract
A separation system to prepare a high .alpha.-glycosyl-L-ascorbic acid content product involves the use of a specific anion-exchange membrane having a molecular weight cut-off in the range of about 100-1,000. The system readily separates .alpha.-glycosyl-L-ascorbic acid from L-ascorbic acid and other impurities and provides a relatively-high yield.
Claims1
A separation system for preparing a high .alpha.-glycosyl-L-ascorbic acid content product, which consists essentially of:
- (a) a container which holds a solution having a pH of 2-7 containing .alpha.-glycosyl-L-ascorbic acid and L-ascorbic acid;
- (b) a plurality of pairs of (1) cation-exchange membranes and (2) anion-exchange membranes which are provided within said container and spaced apart from one another and which separate said container into 50-5,000 cells of material-feed cells and permeation cells, said anion-exchange membranes having a molecular weight cut-off in the range of about 100-1,000;
- (c) an anode and a cathode in different end cells of said container;
- and
- (d) a DC power supply means, connected to said anode and cathode, for decreasing stepwisely voltage across said anode and said cathode as specific electric resistance of the solution in said material-feed cell increases.
2 more elements
Dependencies are inferred from the claim text.