【Description】 This product is white, loose, needle-like crystals or a crystalline powder; odorless, with a bitter taste; it gradually changes color upon exposure to light or heat.

Melting point After drying this product at 130°C, determine as described in the method (Appendix VII C), the melting point is 232–240°C.

Specific rotation Accurately weigh this product, dissolve in methanol to prepare a solution containing 20mg per 1ml, determine as described in the method (Appendix VII), calculated on the dried basis, the specific rotation is.

【Tests】Loss on drying Dry this product at 130°C to constant weight, the loss in weight is not more than 6.0% (Appendix IX G).

Sulfated ash Not more than 0.1% (Appendix IX J).

【Assay】 Accurately weigh about 20mg of this product, place in a 50ml volumetric flask, dissolve in alcohol and dilute to volume, mix well. Accurately measure 1ml, place in a 25ml volumetric flask, dilute to volume, mix well. According to the spectrophotometric method (Appendix V A), measure the absorbance at a wavelength of 275nm, calculate based on the absorption coefficient (E_1cm^1%) of bergenin (C₁₄H₁₆O₉) 248, then obtain.

Sichuan Jiexiang Medicinal Material Raw Material Co., Ltd.