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Appearance White crystalline powder Assay 98.0～102.0% [α]D20?Specific rotation ＋84.0°～＋87.5° Water ≤2.0% pH of 10% aqucous solution 5-8 Heay metals(Pb) ≤10ppm Lead ≤1ppm Arsenic ≤1ppm Residue on lgnition ≤0.2% Hydrolysis products ≤1.5% Two sugar chloride ≤0.5% Single sugar chloride ≤0.1% Triphenylphosphine oxide ≤150 ppm Methanol ≤0.1% Total plate counmt NMT 250/g Mold NMT 50/g Escherichia Coli Negative Salmonella spp. Negative

Description White crystalline powder Identification Meets the requirements Assay ,% min 98.5~101.0 pH value 5.0～7.0 Specific Rotation [a] D20° +24.5o~ +26.8o State of solution，% min 98.0 Loss on drying,% max 0.30 Residue on ignition,% max 0.10 Chloride (as Cl),% max 0.02 Sulphate(as SO4),% max 0.02 Heay metals (as Pb),% max 0.001 Iron (as Fe) , % max 0.001 Ammonium (as NH4) ,% max 0.02 Arsenic (as As),% max 0.0001

DL-Alanine 302-72-7 C3H7NO2 99%min A colorless to white odorless crystalline powder,99%min

Appearance White crystals or crystalline powder Assay 98.5-101.5% Specific rotation +13.7°~ +15.1° PH 5.5-7.0 Loss on drying 0.2% max Residue on ignition 0.15% max Chloride 0.05% max Sulfate 0.03% max Iron 0.003% max Heay metals(as Pb) 0.0015% max Chromatographic purity Total impurity: 2.0% max Individual impurity: 0.5% max

Appearance White crystals or crystalline powder Assay 98.5-101.5% PH 5.5-7.0 Specific rotation (20/D) -29.4°~ -32.8° Hevy metals(as Pb) 0.0015% max Chloride 0.05% max Sulfate 0.03% max Iron 0.003% max Loss on drying 0.3% max Residue on ignition 0.1% max

Appearance White crystals or crystalline powder Indentification(IR) Conforms to standard spectrum Assay 98.5-101.0% Chromatographic purity(TLC) Total impurities: 2.0%max Individual impurities: 0.5% max Specific rotation +14.0°~ +15.6° Chloride(as Cl) 0.05% max Sulphate 0.02% max Iron 0.003% max Heay metals(as Pb) 0.0015% max Loss on drying 0.2% max Residue on ignition 0.1% max Solution transmittance 98.0%min

Appearance White crystals or crystalline powder Assay 98.5%~101.5% Speciific rotation -27.6°~-29.0° PH 5.0-6.5 Chloride 0.02% max Ammonium 200ppm max Sulfate 0.02% max Hevy metals 10PPM max Arsenic 1 PPM max Iron 10PPM max Other amino acids 0.5% max Residue on ignition 0.1% max Loss on drying 0.2% max

White to creamy-yellow crystalline powder,50%min, PH 5.5-7.5, Loss on drying 8.0% max, heay metals 10ppm max

Appearance White crystals or crystalline powder Assay 98.5-101.5% PH 5.4-6.0 Specific rotation (20/D) -32.7°~ -34.7° Heay metals(as Pb) 15ppm max Chloride 0.05% max Sulfate 0.03% max Iron 0.003% max Loss on drying 0.2% max Residue on ignition 0.4% max

Appearance White crystals or crystalline powder Identification IR: Complies with the ref. spectrum Assay 98.5-101.5% Chromatagraphic purity Complies Specific rotation (20/D) -9.8°~ -11.2° Hevy metals(as Pb) 0.0015% max Chloride 0.04% max Sulfate 0.04% max Iron 0.003% max Organic volatile impurities Meets the requirement Loss on drying 0.3% max Residue on ignition 0.4% max

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