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Description
Catalogue Number	102839
Synonyms	Cys, L-Cysteinium Chloride Monohydrate, L-Cysteine Hydrochloride, Monohydrate

Physicochemical Information
Density	1.51 g/cm3
Melting Point	176 °C
pH value	0.8 – 1.2 (100 g/l, H₂O, 20 °C)
Vapor pressure	<0.1 hPa (20 °C)
Bulk density	780 kg/m3
Solubility	650 g/l

Safety Information according to GHS
RTECS	HA2285000
Storage class	10 – 13 Other liquids and solids
WGK	WGK 1 slightly hazardous to water
Disposal	3 Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.

Storage and Shipping Information
Storage	Store below +30°C.

Specifications
Assay (alkalimetric, calculated on dried substance)	98.5 – 101.0 %
Identity (IR-spectrum)	passes test
Identity (wet chemistry)	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 (α 20/D, 80 g/l, hydrochloric acid 250 g/l, calc. on dried substance)	+5.5 to +7.0
Sulfate (SO₄)	≤ 200 ppm
Heavy metals (as Pb)	≤ 10 ppm
Fe (Iron)	≤ 10 ppm
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 %
Sulfated ash (600 °C)	≤ 0.1 %
Loss on drying (Vacuum < 2,0 kPa, P₂O₅, 20 h)	8.5 – 12.0 %
Residual solvents (ICH Q3C)	excluded by manufacturing process
Sulfated ash (600 °C)	≤ 0.1 %
Loss on drying (Vacuum < 0.7 kPa, P₂O₅, 24 h)	8.0 – 12.0 %
Bacterial endotoxins	≤ 6.0 I.U./g

Merck 102839 0025 Cysteine Hydrochloride Monohydrate For Biochemistry 25 GR.