Thermo Fisher, 111780050, L-Cysteine hydrochloride hydrate, 98.5-101.0%

Thermo Scientific L-cysteine hydrochloride hydrate is a laboratory amino-acid reagent supplied as 5 g of white to off-white crystalline material. Its assay specification is 98.5–101.0% on a dried-substance basis by iodometric titration. The hydrochloride salt provides a water-soluble source of the sulfur-containing amino acid and can participate in experimental chemistry where a reactive thiol or nucleophilic functional group is required. In solution, cysteine chemistry may be affected by oxidation, pH and exposure to air, so preparation conditions should be selected with the intended reaction in mind. This material is suitable for laboratory reagent formulation and method development rather than direct clinical administration. Record the exact mass and solution preparation time when repeatability matters, and use appropriate protective equipment while handling the powder. Review the relevant safety information before preparing concentrated solutions. The product is a chemical reagent, not an enriched cell-growth supplement or a validated pharmaceutical formulation.