L-Cysteine Mono HCL,CAS 7048-04-6

L-cysteine hydrochloride hydrate is a hydrate that is the monohydrate form of L-cysteine hydrochloride. It has a role as an EC 4.3.1.3 (histidine ammonia-lyase) inhibitor, a flour treatment agent and a human metabolite. It contains a L-cysteine hydrochloride.

L-Cysteine, hydrochloride, monohydrate Use and Manufacturing
Methods of Manufacturing
Hydrolyze the hair with hydrochloric acid for 6-8 hours, distill off the hydrochloric acid under reduced pressure, decolorize with activated carbon, and filter. The filtrate is neutralized with ammonia to obtain crude L-cystine crystals, and then recrystallized with ammonia to obtain L-cystine. Using L-cystine as raw material, L-cysteine ​​can be obtained through reduction, and there are two methods. Tin particle reduction method. Dissolve L-cystine in dilute hydrochloric acid, add tin particles and raise the temperature to reflux for 2h, filter out the remaining tin particles in the reducing solution, dilute with water, and then saturate with hydrogen sulfide; filter, and filter residue washed with a small amount of water ; Combine washing solution and filtrate, concentrate under reduced pressure, cool and crystallize, separate, and dry to obtain L-cysteine ​​hydrochloride. HOOCCH(NH2)CH2SSCH2CH(NH2)COOH+Sn[HCl, H2S→HSCH2CH(NH2)COOH·CHl electrolytic reduction method L-cystine and dilute hydrochloric acid are added to the electrolytic cell, stirred and dissolved, and electrolyzed at 50 ℃; electrolysis The solution is saturated with hydrogen sulfide for several hours; filtered, the filtrate is decolorized with activated carbon, the decolorized liquid is concentrated under reduced pressure, cooled and crystallized, separated and dried to obtain L-cysteine ​​hydrochloride, and the consumption of cystine is 0.7t per ton of product , Hydrochloric acid 1t. HOOCCH(NH2)CH2SSCH2CH(NH2)COOH+HCl→HSCH2CH(NH2)COOH·CHl
Uses
L-Cysteine is a non-essential amino acid that can be synthesized by the human body under normal physiological conditions if a sufficient quantity of methionine is available. L-Cysteine is commonly used as a precursor in the food and pharmaceutical industries. L-Cysteine is used as a processing aid for baking, as an additive in cigarettes, as well as in the preparation of meat flavours.