L-Tryptophan, Feed Additive, Amino Acid, Feed Grade/Amino Acid, Appearance:White crystals or pale yellow crystalline powder L-Tryptophan/Feed Grade/Amino Acid,CAS NO: 73-22-3,Certificate of Analysis:ItemStandard(Q/AFF08-2008/ AJI92 )Test ResultAppearanceWhite crystals or pale yellow crystalline powderPass testContent (On dry base)≥98%98.57%Specific rotation-29.0°—-33.0°-31.04° Chloride≤0.03%0.004 ...