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1)Name:L-Cysteine
Synonyms:(+)-2-Amino-3-mercaptopropionic acid; L-beta-Mercaptoalanine; CySH
Molecular Formula:C3H7NO2S
Molecular Weight:121.15
CAS Registry Number:52-90-4
EINECS:200-158-2
FEMA:3263
Cysteine (abbreviated as Cys or C) is an α-amino acid with the chemical formula HO2CCH(NH2)CH2SH.
Its codons are UGU and UGC. With a thiol side chain, cysteine is classified as a hydrophobic amino acid. Because of the high reactivity of this thiol, cysteine is an important structural and functional component of many proteins and enzymes. Cysteine is named after cystine, its oxidized dimer.
Specification:
Product name
 L-Cysteine
 
Items
 Specifications
 
Appearance
 White crystal or crystalline powder
 
Identification
 Meets the requirements
 
Optical rotation
 +8.3 ~ +9.5°
 
Heavy metals
 10 ppm Max.
 
Moisture
 0.50 % Max.
 
Residue on ignition
 0.10 % Max.
 
Assay
 98.0 ~ 101.0 %
 
pH
 4.5 ~ 5.5
 
 
(2)Name:DL-Cysteine
Synonyms:2-Amino-3-mercaptopropionic acid
Molecular Structure:
Molecular Formula:C3H7NO2S
Molecular Weight:121.16
CAS Registry Number:3374-22-9
EINECS:222-160-2