L-Tryptophan is one of our main products, and the the table below shows its specifications Product NameL-TryptophanCAS #73-22-3MFC11H12N2O2MW204.22 AppearanceWhite or off-white Powder Assay 98.5% -101.5%Loss on drying Not more than 0.50%pH5.5 to 7.0Specific Rotation [20/D] -30°to-33°