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Dynamic microwave-assisted extraction of flavonoids from Herba Epimedii

机译：微波辅助提取淫羊Herb中的黄酮

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摘要

An apparatus for extraction of flavonoids from Herba Epimedii has been constructed which utilizes a microwave technique for heating in a dynamic mode. A TM_(010) microwave resonance cavity was applied to concentrate the microwave energy; the power needed to achieve efficient extraction was significantly reduced. The method has been compared with other extraction methods, such as pressurized microwave-assisted extraction (PMAE), ultrasonic extraction (UE), heat reflux extraction (RE) and Soxhlet extraction (SOX). The four flavonoids in extract were identified by HPLC-MS. The influence of extraction parameters on the extraction yield of flavonoids has been evaluated by comparison with the peak areas of HPLC-DAD spectra in the different extraction methods. The results showed that the extraction yield of flavonoids in Herba Epimedii obtained by dynamic microwave-assisted extraction (DMAE) was higher than that obtained by UE, RE and SOX, and the extraction time is dramatically reduced. The extraction yield obtained by DMAE is similar to that obtained by PMAE. But the flavonoids in Herba Epimedii would not decompose easily when increasing the extraction time in DMAE. This is the benefit of dynamic extraction system which can transfer the analytes extracted from the sample matrix with flowed fresh solvent to the out of extraction vessel.
机译：已经构造了从淫羊Herb中提取黄酮类的设备，该设备利用微波技术以动态模式进行加热。用TM_（010）微波谐振腔集中微波能量。实现有效提取所需的功率大大降低了。该方法已与其他提取方法进行了比较，例如加压微波辅助提取（PMAE），超声提取（UE），热回流提取（RE）和索氏提取（SOX）。 HPLC-MS鉴定了提取物中的四种黄酮。通过与不同提取方法中HPLC-DAD谱图的峰面积比较，评估了提取参数对类黄酮提取率的影响。结果表明，动态微波辅助萃取（DMAE）法提取的淫羊Herb中黄酮类化合物的提取率高于UE，RE和SOX法，提取时间明显减少。通过DMAE获得的提取收率与通过PMAE获得的提取收率相似。但是，当增加DMAE中的提取时间时，淫羊Herb中的类黄酮不会轻易分解。这是动态提取系统的优势，它可以将从样品基质中提取的分析物与流动的新鲜溶剂一起转移到提取容器之外。

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