Test items

Specifications          

Results

Assay (%)

98.5-101.0

99.2

pH value

2.5~3.5

3.0

Specific optical rotation [a]²⁰

-24゜~-26゜

-25.23゜

State of solution min

≥98.0%

98.8%

Loss on drying max

0.20%

0.16%

Residue on ignition

≤ 0.10

< 0.1

Chloride% max

≤ 0.02

< 0.02

Sulphate (SO₄) max

≤ 0.02

< 0.02

Heavy metals max

≤10 ppm

< 10 ppm

Iron  max

≤10 ppm

< 10 ppm

Ammonium%

≤ 0.02

< 0.02

As %

≤1 ppm

< 1 ppm

Other amino acid

Not detectable

Not detectable