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Flavonols were extracted from Acanthopanax Senticosus Harms by Soxhlet extraction(SE),atmospheric pressure microwave-assisted extraction(AMAE) and pressurized microwave-assisted extraction(PMAE).The influences of experimental conditions,such as concentration of ethanol in the eluent,microwave irradiation time,etc.on the extraction yield were studied.Four flavonols(hyperin,rutin,quercitrin and quercetin) in the extracts were determined quantitatively by HPLC method.The experimental results demonstrate the advantages of PMAE and AMAE over those of conventional SE,that is the extraction time is dramatically reduced,and the yields of flavonols are effective improved.Although the yield of flavonols is higher and the extraction time is shorter by PMAE than those of AMAE,flavonols are easy to be decomposed over a certain time.
Flavonols were extracted from Acanthopanax Senticosus Harms by Soxhlet extraction (SE), atmospheric pressure microwave-assisted extraction (AMAE) and pressurized microwave-assisted extraction (PMAE). These influences of experimental conditions, such as concentration of ethanol in the eluent, microwave irradiation time, etc.on the extraction yield were studied.Four flavonols (hyperin, rutin, quercitrin and quercetin) in the extracts were determined quantitatively by HPLC method. the experimental results demonstrate the advantages of PMAE and AMAE over those of conventional SE, that is the extraction time is dramatically reduced, and the yields of flavonols are effective improved. Although the yield of flavonols is higher and the extraction time is shorter by PMAE than those of AMAE, flavonols are easy to be decomposed over a certain time.