MF: C3H7NO2S· HCl· H2O

Molecular Weight: 175.64

L-cysteine hydrochloride is a colorless to white crystalline or crystalline powder, with a slight special odor and sour taste, and a melting point of 175 °C (decomposition). Soluble in water, the aqueous solution is acidic, the pH value of the 1% solution is about 1.7, and the pH value of the 0.1% solution is about 2.4.

L-cysteine hydrochloride quality requirements: quality standards (FCC, IV.)

Content (after drying)/% 98.0~101.5

Loss on drying/% 8.0~12.0

Residue on ignition/% ≤ 0.1

Optical rotation [α] 20 +5.0°~ +8.0°

[α]25 +4.9°~ +7.9°

Arsenic (as As)/% ≤ 0.0003

Heavy metals (in Pb)/% ≤ 0.002

Lead/% ≤ 0.0010

Gold/% ≤ 0.001

L-cysteine hydrochloride uses and precautions: flour treatment agent, nutritional supplement. As a nutritional supplement, it should not be added at a maximum of 2.3% of the total protein content (including L-cystine). China's "Hygienic Standard for the Use of Food Additives" (GB2760-2011) stipulates that it is used for fermented flour products, 0.06g/kg. The dosage of frozen rice flour products is 0.6g/kg (based on L-cysteine hydrochloride).