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首页> 外文期刊>Separation and Purification Technology >Extraction characteristics and kinetic studies of oleanolic and ursolic acids from Hedyotis diffusa under ultrasound-assisted extraction conditions
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Extraction characteristics and kinetic studies of oleanolic and ursolic acids from Hedyotis diffusa under ultrasound-assisted extraction conditions

机译：超声波辅助提取条件下白花蛇舌草中齐墩果酸和熊果酸的提取特性及动力学研究

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摘要

We report a hyphenated procedure for the extraction of oleanolic acid (OA) and ursolic acid (UA) from Hedyotis diffusa. The hyphenated ultrasound-assisted extraction (HUAE) procedure consists of heat-reflux extraction (HRE) followed by ultrasound-assisted extraction (UAE). This hyphenated technique uses a lower temperature, consumes less solvent and is faster than previous methods. Compared to heat-reflux and traditional ultrasound-assisted extractions, HUAE gave a 12% higher yield of OA and UA from H. diffusa and required less severe operating conditions. Thus, mild operating conditions can be used, which results in a higher quality product. HUAE is an effective and selective method for the extraction of OA and UA Additionally, the HUAE of OA and UA from H. diffusa were interpreted using a second-order kinetic model to predict the extraction parameters at various temperatures. Furthermore, the activation energies for the extractions of OA and UA were 9.073 and 10.575 kJ/mol, respectively, based on the second-order extraction rate constants used to build the models. By fitting the main parameters of the model, we could compare the effects of the extraction parameters on the H. diffusa material and better understand the extraction process.
机译：我们报告了从白花蛇舌草中提取齐墩果酸（OA）和熊果酸（UA）的联用程序。联用超声辅助提取（HUAE）程序包括热回流提取（HRE），然后是超声辅助提取（UAE）。这种联用技术使用较低的温度，消耗较少的溶剂，并且比以前的方法更快。与热回流和传统超声辅助提取相比，HUAE的白花蛇舌草OA和UA收率提高了12％，并且所需的操作条件也更少。因此，可以使用温和的操作条件，从而获得更高质量的产品。 HUAE是提取OA和UA的有效且选择性的方法。此外，使用二阶动力学模型解释了白花蛇舌草OA和UA的HUAE，以预测在不同温度下的提取参数。此外，基于用于构建模型的二阶萃取速率常数，用于OA和UA萃取的活化能分别为9.073和10.575 kJ / mol。通过拟合模型的主要参数，我们可以比较提取参数对白花蛇舌草材料的影响，并更好地了解提取过程。

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