CAS Registry Number

CAS 56-89-3 — L-Cystine

L-Cystine is a disulfide-bonded dimer of the amino acid L-cysteine, used in biochemical research, cell culture media, and pharmaceutical formulations for its role in protein structure and antioxidant activity. In food manufacturing it serves as a flour treatment agent and dough strengthener, a flavoring agent and a nutritional supplement, and it is also used as a cosmetic ingredient. It has a CAS number of 56-89-3, molecular formula [-SCH2CH(NH2)CO2H]2, and a molecular weight of 240.30 g/mol. Stable at ambient storage conditions. Molekula supplies L-Cystine from research to bulk quantities with full documentation and ISO 9001:2015 traceability.

Also known as: 1-Cystine · beta,beta'-Dithiodialanine · Cysteine disulfide · Cystin · cystine · Cystine acid · Cystine, L- · Dicysteine · L-Cysteine disulfide · L-Dicysteine · L-Cystine EP grade · L-Cystine - EDQM reference standard