Purity >98.0%
Loss on drying <0.2 % (105°C, 3 小时)
Heavy metals (as Pb) <10 ppm
Sulfated ash <0.1 %
4.7 - 6.2 (2.5% ， 25°C)
Other amino acids <0.5 % (TLC)
Specific rotation [a]20/D +21.4° - +23.6°(c=8, 6 N HCl)
Trace analysis :
SO4 < 300 ppm
NH4 < 200 ppm
Fe < 10 ppm
Transmittance >95 % (c=10, H2O, 430 nm) 1 cm cell
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