Adsorption and desorption characteristics of epigallocatechin-3-gallate from discarded green tea leaves on macroporous resin

IF 2.5 4区化学 Q2 Engineering

Chemical Papers Pub Date : 2025-08-25 DOI:10.1007/s11696-025-04305-z

Basak Bilcanoglu Cagan, Huseyin Karakaya, Murat Yilmaztekin

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Abstract

Green tea (Camellia sinensis) is intensely consumed all over the world and tea leaves discarded from production are a rich source of catechins, especially epigallocatechin-3-gallate (EGCG). This study aimed to perform preparative separation of EGCG from green tea waste by using macroporous resin and to reveal adsorption and desorption characteristics. Nine types of resins were compared for their adsorption and desorption capacities and desorption rate of EGCG, and NKA-2 was found the most suitable resin for the purpose. Adsorption isotherms were evaluated at 25 °C, 35 °C and 45 °C. Experimental data were well described with pseudo-second-order kinetics model and fitted best to the Langmuir model in tested temperatures. In dynamic separation process, 83% of adsorbed EGCG was recovered from the resin by using 70% ethanol. It has been thought that using macroporous resin can be an effective way of EGCG separation from green tea waste for commercial purposes.

Graphical abstract

Abstract Image

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大孔树脂对废弃绿茶中表没食子儿茶素-3-没食子酸酯的吸附和解吸特性

绿茶（Camellia sinensis）在世界各地都被大量消费，生产过程中丢弃的茶叶是儿茶素的丰富来源，尤其是表没食子儿茶素-3-没食子酸酯（EGCG）。采用大孔树脂对绿茶废弃物中EGCG进行制备分离，并对其吸附解吸特性进行研究。比较了9种树脂对EGCG的吸附解吸能力和解吸速率，发现NKA-2树脂是最合适的树脂。在25°C、35°C和45°C条件下测定吸附等温线。实验数据用拟二阶动力学模型很好地描述，在测试温度下最适合Langmuir模型。在动态分离过程中，以70%乙醇为溶剂，吸附的EGCG回收率为83%。利用大孔树脂从绿茶废料中分离EGCG是一种具有商业用途的有效方法。图形抽象

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来源期刊

Chemical Papers Chemical Engineering-General Chemical Engineering

CiteScore

3.30

自引率

4.50%

发文量

590

期刊介绍： Chemical Papers is a peer-reviewed, international journal devoted to basic and applied chemical research. It has a broad scope covering the chemical sciences, but favors interdisciplinary research and studies that bring chemistry together with other disciplines.