Appearance : A white or yellow-white powder Assay(On dried basis) : 98.0%~100.5% Whiteness : Not less than 68 State of solution : Clear and <= BY4 Optical rotation : Between +21°and+24° Melting range : Between 107℃ and 117℃ Loss on drying : <= 0.8% Residue on ingition : <= 0.1% Bacteria amount : <= 1000cfu/g Coliforms bacteria : Not mor than 30 MPN/100g Pathogenic bacteria (salmonella, shigella, staphylococcus aureus) : Negative Heavy metal : <= 4ppm Lead : <= 3ppm Arsenic : <= 1ppm Cadmium : <= 1ppm Mercury : <= 0.01 ppm Identification : Positive