[Name]: L-Tryptophan, L-Trp [Structural formula]: [Molecular Formula]: C11H12N2O2 [Molecular weight]: 204.23 [Properties]: White crystals or crystalline powder,slightly bitterness.. Melting point at 289℃. Slightly soluble in water, insoluble in ethanol and in ether. We are the main manufacture of L-TRYPTOPHAN in CHINA, Quality standard as Food Grade (FCC Ⅴ), Pharma Grade(USP32)，F(xiàn)eed Grade or discuss. Items Pharma Grade(USP32) Food Grade(FCC Ⅴ) Feed Grade Appearance White crystalline powder White crystalline powder Light yellow powder Assay(on dry basis) 98.5% ～ 101.5% 98.5% ～ 101.5% 98.0% Min Specific rotation -29.4º ～ -32.8º -30.0º ～ -33.0º -- PH 5.5 ～ 7.0 -- -- Loss on drying 0.3% Max 0.3% Max 1.0% Max Residue on ignition 0.1% Max 0.1% Max 0.5% Max Chloride 0.05% Max -- -- Sulfate 0.03% Max -- -- Iron 0.003% Max -- -- Heavy metals 0.0015% Max -- -- Lead -- 5mg/kg Max -- [USAGE]: L-TRYPTOPHAN is one of the essential amino acids for human and animal, mainly used as A: Food Grade L-TRYPTOPHAN is mainly used as nutritional supplement in food additive. B: Pharma Grade L-TRYPTOPHAN is mainly used in formatting complex amino acid perfusion and preparation. C: Feed Grade L-TRYPTOPHAN is mainly used as nutritional supplement in feed. [Packing]: In kraft paper bags or in fiber drum 25KG net each. [Transport and Storage]: Handle with cares to avoid damaging the package, protects them from sunshine or rain. Don't transport it with poisonous or harmful goods. Stored in shaded, cool and dry places.