items standard results description white or practically white white crystalline powder crystalline powder identification complies with the standard complies solubility in water sparingly soluble complies in ethanol, chloroform and other insoluble complies melting point about 258-264? 260? specific rotation -95º~-100º -98.0º ph 4.5~6.5 5.80 (c=1.5g/100ml water) loss on drying max.1.0% 0.36% sulphated ash max 1.0% 0.21% heavy metal max 20ppm 1.9 absorption (50ug in 1ml water) 79.6~86.2(289nm) 82.6 assay(hplc) min.99.0%(232nm) 99.68% (basis on dry )