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Personne àcontacter Kelly
NO 1, HUANG XIAO BEI ROAD, Wuhan, Hubei
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Item
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Specification (EP6)
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Characters
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White or almost white,
crystalline powder or colourless crystals, freely soluble in water
and in ethanol, practically insoluble in methylene
chloride.
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Infrared Spectrum
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Conforms to
standard
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Identification
reaction
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A dark violet colour
develops
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Appearance of
solution
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Clear and
colourless
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pH
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2.0 to 2.8
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Specific rotation
[α]D*0
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**1.0 to **7.0°
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Related
substances
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By Liquid
chromatography
L-Cystine:
<0.5%
L-Cysteine:
<0.5%
N, N’-diacetyl-L-Cystine:
<0.5%
N,S’-diacetyl-L-Cysteine:
<0.5%
Each known impurity and each
unknown impurity is not greater than 0.5%.
The sum of known and unknown
impurities is not greater than 0.5%.
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Heavy metals (Pb)
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Not more than
*0ppm
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Zinc
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Not more than
*0ppm
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Loss on drying
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Not more than
1.0%
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Sulphated ash
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Not more than
0.2%
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Assay
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*8.0 to **1.0 %
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