cysteine

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Item	Specifications
Item	USP	AJI
外观	White crystals or crystalline powder; strongly acid taste.
Identification	Infrared Absorption	—
Specific optical rotation	+5.6 °- +8.9 °	+5.5 °- +7.0 °
State of solution (Transmittance)	—	>= 98.0% clear and colorless
Chloride (Cl)	—	19.89-20.29%
Ammonium(NH4)	—	=< 0. 002%
Sulfate	=< 0. 03 %	=< 0. 020%
铁	=< 0. 003 %	10ppm
Heavy Metals (as Pb),	=< 0.00 15%	=< 10ppm
Arsenic (as As),	—	=< 1ppm
Other amino acids	—	Not detected
Organic volatile impurities	Meets the requirement	—
Loss on drying,	8-12 %	8.5-12 %
Residue on ignition,	c	=< 0.1 0 %
化验	98.5-101.5 %	9 9.0-10 0.5 %
pH value	—	1.5-2.0
Organic volatile impurities	Meets the requirement	—
Chromatographic purity	0.5% max Individual impurity, 2% max total	—

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