L- Cystine / L Cystine

L- Cystine For Analys Merck
kemasan 25Gram SEGEL.!!

Description
Catalogue Number 102839
Synonyms Cys, L-Cysteinium Chloride Monohydrate, L-Cysteine Hydrochloride, Monohydrate
Product Information
CAS number 7048-04-6
EC number 200-157-7
Hill Formula CHClNOS * HO
Molar Mass 175.64 g/mol
HS Code 2930 90 16
Structure formula Image
Physicochemical Information
Melting Point 168 - 170 C
pH value 0.8 - 1.2 (100 g/l, HO, 20 C)
Bulk density 780 kg/m3
Solubility 650 g/l

Specifications
Assay (alkalimetric, calculated on dried substance) 98.5 - 101.0 %
Identity (IR-spectrum) passes test
Identity (Chloride) passes test
Appearance white or almost white, crystalline powder or colorless crystals
Appearance of solution (25 g/l, water) clear and not more intense in color than reference solution BY6
Spec. rotation ( 20/D, 80g/l, hydrochloric acid 250g/l, calc. on dried substance) +5.5 to +7.0
Spec. rotation ( 25/D, 80g/l, hydrochloric acid 6mol/l, calc. on dried substance) +5.7 to +6.8
Sulphate (SO) 300 ppm
Heavy metals (as Pb) 10 ppm
Fe (Iron) 20 ppm
Related Compounds, total (TLC) 0.5 %
Ninhydrin-positive substances (LC) (impurity A (570 nm)) 0.5 %
Ninhydrin-positive substances (LC) (any ninhydrin-positive impurity) 0.2 %
Ninhydrin-positive substances (LC) (ammonium (570 nm)) 0.02 %
Ninhydrin-positive substances (LC) (total impurities) 1.0 %
Residual solvents (ICH Q3C) excluded by manufacturing process
Sulfated ash (600C) 0.1 %
Loss on drying (Vacuum <0.7kPa, PO, 24h) 8.0 - 12.0 %
Bacterial endotoxins 6.0 I.U./g