Tryptophan

tryptophan(L-tryptophane) Test ltemSpecificationPh5.4 6.47Specific rotation[α]D20°-30.0 -32.5 Ammonnium(NH4)Not More Than 0.02%Chloride contentNot More Than 0.02%Sulfate(SO4)Not More Than 0.02%lron(Fe)Not More Than 0.002%Heavy metals(as Pb)Not More Than 0.001%Arsenic (As2O3)Not More Than 0.0001%Loss on dryingNot More Than 0.2%Resdue on ignitionNot More Than 0.1%Foreign amino acidsNot More Than 0.5%Pyrogen*FreeAssay (dry basis)98.0 102.0%1.Light greycrystal or crystalline powder 2.Almost odorless3.Characteristic taste4.ISO14000, ISO19000,Hala.STORAGE: keep in cool and dry place and in seal closed container