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Study on microwave-assisted extraction of gypenosides from leaves of Gynostemma pentaphyllum

ZHANG Yu-song(Science and Technology Developing Corporation,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China)  
Microwave-assisted extraction of gypenosides from leaves of Gynostemma pentaphyllum were studied by using single factor test methods.The results showed that the optimum conditions were as follows: the solid-liquid ratio was 1∶25,pH was 8,the extract temperature was 70 ℃,the duration for extraction was 120 min,medium intensity microwave,microwave treatment duration was 180 s.
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