Merck 102839 0025 Cysteine Hydrochloride Monohydrate For Biochemistry 25 GR.

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

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Product Information
CAS number	7048-04-6
EC number	200-157-7
Hill Formula	C₃H₈ClNO₂S * H₂O
Molar Mass	175.60 g/mol
HS Code	2930 90 16
Structure formula Image
Quality Level	MQ100

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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

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

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

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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