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L-Cysteine monohydrochloride
Molecular formula: C3H7NO2S·HCL·H2O
Molecular weight: 175.63
Description:
Colorless to white fine columnar crystal or white crystalline powder with slight odor and taste (slightly sour). A reduction, there has antioxidant and prevent non-enzymatic browning effect. Melting point 175 °C (decomposition). Soluble in water, acidic aqueous solution, pH value was 1.2 when 3% solubility,1.7 when 1% solubility,2.4 when 0.1% solubility. Is also soluble in ethanol, ammonia and acetic acid, insoluble in ether, acetone, benzene, carbon disulfide and chlorine imitation.
One amino acid, but non-essential amino acids
Preparation:
By a hair (or animal hair, feathers) with hydrochloric acid heated 6 ~ 8h, hydrolysis, hydrochloric acid distillate by vacuum distillation, plus active carbon, filtration, and after that with ammonia in the crude crystalline L-cystine, and then dissolved and the liquid ammonia and, after recrystallization, and then dissolved in hydrochloric acid and the electrolytic reduction, and concentration, cooling, crystallization, drying derived,
Quality standard FCC,1996
1.Assay(dyring base) | 98.0%~101.5% |
2.Loss on drying | 8.0%~12.0% |
3.Residue ignition(GT-27) | ≤0.1% |
4.Test about Cystine and other amino acids | Negative |
5.Lead(GT-18) | ≤10mg/kg |
6.Heavy metal | ≤0.002% |
7.Ammonium salt | ≤0.03 |
Application:
Bread improver; nutritional supplements; antioxidants; color fixative. Of acrylonitrile and aromatic acid poisoning detoxification; the prevention of radiation injury; have a therapeutic effect of bronchitis and phlegm; the absorption of alcohol to acetaldehyde in the body into the role of the solution drunk.
According to GB2760-96 requirements, mutatis mutandis, to spices.
