MERCK 102838.0025 L-Cysteine for Biochemistry - Laboratuvar Malzemeleri ve Cihazları Tedarikçisi

Ürün Kodu

SD.M.102838.0025

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MERCK 102838.0025 L-Cysteine for Biochemistry

Description
Catalogue Number	102838
Synonyms	a-Amino-ß-mercapto propionic acid, αlpha-Amino-ß-mercapto propionic acid, Cys, αlpha-Amino-beta-mercapto propionic acid

Applications
Application	L-Cysteine for biochemistry. CAS 52-90-4, pH 4.5 - 5.5 (100 g/l, H₂O, 20 °C).

Physicochemical Information
Density	1.66 g/cm3 (45 °C)
Ignition temperature	420 °C
Melting Point	>203 °C
pH value	4.5 - 5.5 (100 g/l, H₂O, 20 °C)
Bulk density	300 kg/m3
Solubility	280 g/l

Toxicological Information
LD 50 oral	LD50 Rat 1890 mg/kg

Safety Information according to GHS
RTECS	HA1600000
Storage class	10 - 13 Other liquids and solids
WGK	WGK 1 slightly hazardous to water
Disposal	3Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.

Safety Information
Categories of danger	harmful

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

Specifications
Assay (perchloric acid titration, calculated on dried substance)	≥ 99.0
Identity (IR-spectrum)	passes test
Appearance	colorless to white, needle-shaped crystals
Appearance of solution (100 g/l, hydrochloric acid 2 mol/l)	clear and colorless
Spec. rotation (α 20/D, 80 g/l, hydrochloric acid 1 mol/l, calc. on dried substance)	+8.3 to +9.5
pH (25 g/l; CO₂-free water)	4.5 - 5.5
Chloride (Cl)	≤ 0.04 %
Sulfate (SO₄)	≤ 0.03 %
Heavy metals (as Pb)	≤ 0.001 %
As (Arsenic)	≤ 0.0001 %
Ca (Calcium)	≤ 0.001 %
Co (Cobalt)	≤ 0.0005 %
Fe (Iron)	≤ 0.001 %
K (Potassium)	≤ 0.0005 %
Mg (Magnesium)	≤ 0.0005 %
Na (Sodium)	≤ 0.01 %
NH₄ (Ammonium)	≤ 0.02 %
Zn (Zinc)	≤ 0.0005 %
Foreign amino acids	≤ 0.5 %
Other ninhydrine positive substances	≤ 0.1 %
Loss on drying (105 °C; 3 h)	≤ 0.5 %