Appearance White crystals or crystalline powder Solubility Soluble in water and practically insoluble in alcohol and in ether Infrared absorption As per FCCVI Specific rotation [α]D20 +6.3°~ +7.3° Lead ≤5mg/kg Loss on drying ≤0.30% Residue on ignition ≤0.10% Assay 98.5~101.5% Melting point 185℃ with decomposition

Appearance light yellow or off-white powder Assay,% (on dried basis) ≥99 Loss on drying,% ≤0.3 Ash,% ≤0.50

Appearance White crystals or crystalline powder Assay 98.5%min Identification Meet the requirements Specific rotation [α]D25 +22.4°~+24.7° Chloride(Cl) 0.05% max Sulfate(SO4) 0.03% max Iron(Fe) 0.003% max Heay metals(Pb) 0.0015% max Loss on drying 0.30% max Residue on ignition 0.40%max Chromatographic purity Not more than 0.5% of any individual impurity is found； Not more than 2.0% of total impurities is found Organic volatile impurities Meets the requirements pH 5.6~6.1

Appearance White crystals or crystalline powder Assay 98.5%~101.5% Specific rotation[α]D20 +20.4°~+21.4° Iron(Fe) 30ppm max Chloride(Cl) 19.0~19.6% Sulfate(SO4) 0.03% max Heay metals, as Pb 15ppm max Loss on drying 0.40% max Residue on ignition 0.10% max Chromatographic purity Any individual impurity 0.5% max Total impurities 2.0% max Organic volatile impurities Meets the requirements PH 5.5-7.0

Appearance White powder Assay 98.0% Specific rotation[α]D20 +24.0°~+27.0° Iron(Fe) 10ppm max Chloride(Cl) 0.02% max Ammonium(NH4) 0.02% max Heay metals, as Pb 10ppm max Arsenic 1ppm max Loss on drying 5.0% max Residue on ignition 0.20% max Other Amino acids Meets the requirements

Appearance White crystalline solid Identification Passes test A, B,C Oxalate Passes test Assay 98.0% min Specific rotation [a]D25 +95.0°~ + 98.0° Lead (mg/kg) 2 max Loss on drying 0.25% max pH value 5.5~8.0 Arsenic (mg/kg) 3 max Mercury (mg/kg) 1 max

Appearance White crystalline powder Assay 99.5%min Melting point 200-206℃ Sulphate 0.02% max Hevy metal 0.001% max Arsenic 0.0002% max Chloride 0.002% max Oxalate Qualified Loss on drying 0.5% max Residue on ignition 0.10% max

Appearance White or off-white powder Odor taste Characteristic Assay 98%min Active content 45%min PH(3%) 9.0-10.0 Solubility(in water) 0.1%min(10% ap.Soln is clear) Water 11% max As 2ppm max Heay metal(Pb) 20ppm max

Appearance White crystal or crystalline powder Identification A:It responds to the tests for Tartrate. B:When ignited,it gradually decomposes emitting an odor resembling that of burning sugar. Assay(By C4H606) 99.7-100.5% Specific optical rotation +12~+13˚ Heay metals(asPb) 0.001% max Residue on ignition 0.1% max Loss on drying 0.5% max Sulfate 0.015% max Oxalate 0.035% max Arsenic(As) 0.0003% max Calcium 0.02% max Chlorides 0.01% max Transparency and Colority Passed test Solubility Passed test

D-Serine 312-84-5 C3H7NO3 99%min White crystalline powder,Assay:99%min

Appearance white or pale white crystalline powder or colorless crystals Identification As per USP33 Specific rotation +21.4°~ +23.6 ° Loss on drying 0.2% max Residue on ignition 0.1% max Sulfate 0.03% max Heay metals 0.002% max Chromatograhic purity As per USP33 Residual solvents As per USP33 Chloride 16.5-17.1% Assay 98.5-101.5%

Appearance White crystals or crystalline powder Assay 98.5~101.0% pH 10.5~12.0 Specific rotation[α]D20 +26.9°~ +27.9° Transmittance T430 98.0%min Chloride (Cl) 0.020% max Ammonium (NH4) 0.02% max Sulfate (SO4) 0.020% max Iron (Fe) 10ppm max Heay metals(Pb) 10ppm max Arsenic (As) 1ppm max Other amino acids 0.5% max Loss on drying 0.50% max Residue on ignition 0.10% max Pyrogen C=5