Appearance white crystalline or crystalline power Infrared spectrometry complies to structure
Purity ≥98.5% (TLC) Solubility in Water clear
Specific rotation [a]20/D +9.0 ～ +10.3 °(c=11, 6 N HCl) Heavy metals (as Pb) <10 ppm Sulfated ash <0.1 % Other amino acids <0.5 % (TLC) Loss on drying ≤2.0 % SO4 < 200 ppm NH4 < 100 ppm Fe < 10 ppm pH 3 - 5 (2.5% solution，25°C)
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