L-Tryptophan 98.5% Feed Grade. Product NameL-Tryptophan(feed grade)Test StandardQ/AFF08-2008,AJI92 ItemStandard dateActual dataDescription:White crystalline or pale yellowcrystalline powderPass testContent (On dry base), % ≥9898.57Specific rotation-29.0°—-33.0°-31.04° Chloride, % ≤0.030.004 Sulfate % ≤0.030.0005 Heavy metals (Pb), % ≤0.0020.0006Loss on dry, % ≤0.50.14Residue on ignition, % ≤0. 50 ...