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Preliminary extraction of tannins by 1-butyl-3-methylimidazole bromide and its subsequent removal from Galla chinensis extract using macroporous resins

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文献类型：外文期刊

作者： Lu, Chunxia ¹ ; Luo, Xiaoling ¹ ; Lu, Liliang ¹ ; Li, Hongmin ¹ ; Chen, Xia ¹ ; Ji, Yong ¹ ;

作者机构： 1.Xinjiang Acad Agr & Reclamat Sci, Anal & Testing Ctr, Shihezi, Peoples R China

2.Minist Agr Shihezi, Supervis & Testing Ctr Food Qual, Shihezi, Peoples R China

关键词： Galla chinensis;Ionic liquid;Macroporous resins;Tannins

期刊名称：JOURNAL OF SEPARATION SCIENCE （影响因子：3.645；五年影响因子：2.943 ）

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收录情况： SCI

摘要： In recent years, ionic liquids have become increasingly attractive as 'green solvents' used in the extraction of bioactive compounds from natural plant. However, the separation of ionic liquid from the target compounds was difficult, due to their low vapour pressure and high stabilities. In our study, ionic liquid-based ultrasonic and microwave-assisted extraction was used to obtain the crude tannins, then the macroporous resin adsorption technology was further employed to purify the tannins and remove the ionic liquid from crude extract. The results showed that XDA-6 had higher separation efficiency than other tested resins, and the equilibrium experimental data were well fitted to Langmuir isotherms. Dynamic adsorption and desorption were performed on XDA-6 packed in glass columns to optimise the separation process. The optimum conditions as follows: the ratio of column height to diameter bed was 1:8, flow rate 1 BV/h (bed volume per hour), 85% ethanol was used as eluant while the elution volume was 2 BV. Under the optimised conditions, the adsorption and desoption rate of tannins in XDA-6 were 94.81 and 91.63%, respectively. The content of tannins was increased from 70.24% in Galla chinensis extract to 85.12% with a recovery of 99.06%. The result of ultra-performance liquid chromatography (UPLC)-MS/MS analysis showed that [bmim]Br could be removed from extract.

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