item standard descriptionwhite crystals or crystalline powder identificationinfrared absorption spectrum specific rotation(a)d20° +46.5°~ +49.0° stateof solution (transmittance) ≥96.0% chioride(cl) ≤0.020% ammonium(nh4) ≤0.02% heavy metals(pb) ≤10ppm iron(fe) ≤10ppm sulfate(so4) ≤0.020% arsenic(as203) ≤2ppm loss on drying ≤0.5% residue on ignition (suifated) ≤0.1% assay 99.0 ~ 101.0% tyrosine ≤0.1% ph 2.0 ~ 3.0 产品名称 n-乙酰-酪酸 化学名 n-acetyl-l-tyrosine 型号 aji97 用途 医药中间体 外观性状 白色粉状结晶 重金属 5（ppm） 规格 25kg/桶 cas 537-55-3 含量 99