ABSTRACT
Objective To establish a method for Emodin assay in Ampelopsis radix, and to improve the quality control of Ampelopsis radix. Methods Reversed phase high performance liquid chromatography was used. The column: Apollo-C18 (4.6 mm×250 mm, 5 μm); mobile phase: methanol:0.2% phosphoric acid (85:15); flow rate: 1.0 ml/min; column temperature: room temperature; detection wavelength: 220 nm. Results With the specified chromatographic conditions, there was a good linear relationship for Emodin in Ampelopsis radix in the range of 0.124-3.968 μg/ml. The linear regression equation was Y= 53 962X–966.46, r=0.999 7. The average recovery was 99.7%. RSD=2.5% (n=9). Conclusion This method is accurate, sensitive and repeatable. It is suitable for the determination of emodin in Ampelopsis radix.