Productive technology for directly synthesizing S-carboxymethyl-L-semicystine by electrolyzing L-cystine in alkaline medium

Productive technology for directly synthesizing S-carboxymethyl-L-semicystine by electrolyzing L-cystine in alkaline medium

CN
  • CN 1,333,388 A
  • Filed: 12/14/2000
  • Published: 01/30/2002
  • Est. Priority Date: 12/14/2000
  • Status: Abandoned Application
First Claim
Patent Images

1. , a kind of production technique that electrolysis L-Gelucystine directly synthesizes S-carboxymethyl-L-halfcystine in alkaline medium, this production technique may further comprise the steps:

  • (A) the L-Gelucystine in electrolyzer, is 20A with the electric current in alkaline aqueous solution, and voltage is electrolysis 11 hours under the condition of 22V;

    (B) keep the condition electrolysis of pH>

    8 to add the Mono Chloro Acetic Acid condensation, in checking reaction solution, do not have sulfydryl;

    (C) adding acidic aqueous solution then neutralizes and is adjusted to pH2--3;

    (D) crystallization separates obtaining crude product;

    (E) step (D) gained crude product is dissolved in the 1--4mol aqueous hydrochloric acid, adds activated carbon decolorizing when pH15--6, remove the trace heavy metals ion then, filter, it is pH2--3 that filtrate is stirred with the acid neutralization;

    (F) crystallization is filtered, and to there not being chlorine Cl ion, obtains the recrystallization purifying product with the deionized water flushing.

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