L-Cysteine factory CAS NO.52-90-4

product name:

l-cysteine hcl monohydrate

quantity: 1000kgs

batch no:141012

producing date: 2014.10.12

sampling date: 2014.10.12

shelf life: two years

reference standard: usp28

item

specifications

test results

assay,%

98.5-101.5

99.6

identification

pass test

pass test

specific rotation

+5.7°-+6.8°

+6.3°

loss on drying,%

8.0-12.0

8.5

residue on ignition, %

≤0.4

<0.4

sulfate,%

≤0.03

<0.03

iron(as fe), %

≤0.003

<0.003

heavy metals(as pb), %

≤0.0015

<0.0015

organic volatile impurities

meets the requirements

meets the requirements

conclusion: this product conforms to usp28 standard.