... , Amino Acid, Feed Grade/Amino Acid, Appearance:White crystals or pale yellow crystalline powderL-Tryptophan/Feed Grade/Amino Acid,CAS NO: 73 ... Analysis: ItemStandard(Q/AFF08-2008/ AJI92 )Test ResultAppearanceWhite crystals or pale yellow crystalline powderPass testContent (On dry base)≥98%98.57%Specific ...