鉴别

meets the requirements

性状

white crystals or
crystalline powder

比旋光度 [α]_D²⁰

+24.0°to +26.5°

溶液的透过率

clear and colorless
not less than 98.0%

氯化物

not more than 0.039%

铵盐(NH₄)

not more than 0.02%

硫酸盐 (SO₄)

not more than 0.030%

铁盐(Fe)

not more than 30ppm

重金属 (Pb)

not more than 10ppm

砷盐 (As₂O₃)

not more than 1ppm

其它氨基酸

chromatographically
not detectable

干燥失重

not more than 0.50%

灼烧残渣

not more than 0.20%

含量

98.0% to 101.0%

PH

5.0 to 7.0