An effective method for the extraction and purification of chlorogenic acid from ramie (Boehmeria nivea L.) leaves using acidic ionic liquids
文献类型: 外文期刊
第一作者: Tan, Zhijian
作者: Tan, Zhijian;Yang, Zizhen;Li, Fenfang;Li, Xiangdong
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关键词: Ionic liquid;Ultrasonic-assisted extraction;Aqueous two-phase system;Chlorogenic acid;Purification
期刊名称:INDUSTRIAL CROPS AND PRODUCTS ( 影响因子:5.645; 五年影响因子:5.749 )
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收录情况: SCI
摘要: As a green solvent, ionic liquid was developed as a substitute for conventional volatile organic solvents in the extraction field. In this work, several task-specific acidic ionic liquids (TAILs) were applied for ultrasonic-assisted extraction (UAE) of chlorogenic acid (CGA) from ramie leaves. The influencing parameters, viz. ionic liquid (IL) concentration, liquid-solid ratio, and ultrasonic time, were optimized using response surface methodology (RSM). Of the ILs examined, 1-butyl-3-methylimidazolium hydrogen sulfate ([C(4)mim]HSO4) exhibited the best extraction ability. The RSM results revealed that optimized conditions are IL concentration 52.28% (w/w), liquid-solid ratio 89.05:1, and ultrasonic time 49.88 min. An aqueous two-phase system (ATPS) formed by IL extract and salt was then developed for further extraction and purification of CGA. The influencing factors of salt type and concentration, pH, and temperature were investigated in detail. The maximum extraction efficiency of 96.18% was obtained in the IL-rich phase under the conditions of 35.83% (w/w) [C(4)mim]HSO4 and 14.13% (w/w) Na2SO4, pH 3 and temperature 37 degrees C. After extraction, the isolation of CGA and recycling of IL were achieved by back-extraction using a water immiscible organic solvent. This simple and efficient IL-UAE coupled with ATPS has potentiality for the extraction and purification of CGA and other compounds in pilot- or large-scale operations. (C) 2016 Elsevier B.V. All rights reserved.
分类号: S5
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