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[Objective] The study was to investigate the yield and the content of the emodin extracts from Polygonum cuspidatum in Mount Emei.[Method] Using the content and purity of emodin as the indices,we employed the 95% ethanol-water-saturated chloroform method to isolate emodin,alkaline of different pH gradient to extract and HPLC to measure the emodin content.[Result] The emodin content in crude emodin extract reached 94.90%,and the yield of emodin extracted from P.cuspidatum was 0.62%.[Conclusion] The 95% ethanol-chloroform method has stable extraction technology and performs high purity of emodin extracted from P.cuspidatum,which could be used as the extraction technology.The results provided a scientific basis for the exploitation,utilization and quality control of P.cuspidatum resource in Mount Emei.
[Objective] The study was to investigate the yield and the content of the emodin extracts from Polygonum cuspidatum in Mount Emei. [Method] Using the content and purity of emodin as the indices, we employed the 95% ethanol-water-saturated chloroform method to isolate emodin, alkaline of different pH gradient to extract and HPLC to measure the emodin content. [Result] The emodin content in crude emodin extract reached 94.90%, and the yield of emodin extracted from P. cuspidatum was 0.62%. [Conclusion] The 95% ethanol-chloroform method has stable extraction technology and performs high purity of emodin extracted from P. cuspidatum, which could be used as the extraction technology. The results provide a scientific basis for the exploitation, utilization and quality control of P. cuspidatum resource in Mount Emei.