CYSTEINE- ▸ Dough conditioner: Reducing agent and dough strengthener in baking.
- ▸ Flavoring agent: Food flavor ingredient (e.g., reaction/savory flavors).
- ▸ Nutritional supplement: Amino-acid ingredient for foods.
- ▸ Cosmetic ingredient: Reducing and hair-conditioning agent.
- ▸ Research substrate: Reagent for biochemical research.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →L-Cysteine (CAS 52-90-4) is a sulfur-containing alpha-amino acid (C3H7NO2S) bearing a reactive thiol group. It is used as a reducing agent and dough conditioner in baking, as a flavoring agent and nutritional supplement in food, and as a substrate in biochemical research. In cosmetics it functions as a reducing and hair-conditioning agent.
Frequently Asked Questions
What is L-cysteine used for?
L-Cysteine (CAS 52-90-4) is a sulfur-containing alpha-amino acid (C3H7NO2S) with a reactive thiol group, used as a reducing agent and dough conditioner in baking, as a flavoring agent and nutritional supplement in food, and as a substrate in biochemical research. In cosmetics it functions as a reducing and hair-conditioning agent. RawSource supplies it as a bulk raw material.
What is another name for L-cysteine?
L-Cysteine is also written as (R)-cysteine or 2-amino-3-mercaptopropanoic acid, reflecting its thiol (mercapto) side chain; CAS 52-90-4. The same compound is also supplied as its hydrochloride salt for higher water solubility. Identity is confirmed on the CoA.
Is L-cysteine the same as lysine?
No. L-Cysteine is a sulfur-containing amino acid with a thiol group (C3H7NO2S, CAS 52-90-4), while lysine is a separate basic amino acid with no sulfur. They are distinct raw materials sourced and specified independently.
How is L-Cysteine base sold in bulk?
It is supplied as a crystalline powder in industrial packaging (bags, drums) sized for baking, food, and research use. Contact us for bulk pack sizes, minimum order quantity, available grade, lead time, and a current quote. CoA and SDS are provided with every shipment.
What is the CAS number and HS code for L-Cysteine?
L-Cysteine base is CAS 52-90-4 with molecular formula C3H7NO2S. As an organo-sulfur compound it is classified under HS subheading 2930.90. Full identity and specification data accompany each order on the CoA.