Isolation of (+)-Catechin from Food Waste Using Ionic Liquids-Modified ZIF67 Covered Silica

Preprints.org Pub Date : 2026-01-13 DOI:10.20944/preprints202601.0882.v1

Mengshuai Liu, Xiaoman Li, Mengmeng Zhao, Xuyang Jiu, Chuang Yao, Minglei Tian

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Abstract

Background: Food waste contains abundant (+)-catechin, but its efficient recovery remains challenging. This study aimed to prepare ionic liquid (IL)-modified sorbents and establish an efficient method for (+)-catechin recovery from chocolate waste via solid-phase extraction (SPE); Methods: Three serious of IL-modified sorbents (Sil-IL, ZIF67-IL, Sil@ZIF67-IL) were synthesized. Their adsorption performance was evaluated under different conditions; adsorption isotherms and kinetics were fitted to Langmuir/Freundlich and pseudo-first/second-order models, respectively. Sorbent stability and (+)-catechin recovery from chocolate waste extracts were tested; Results: Sil@ZIF67-Hmim showed the highest adsorption capacity (154.4 mg/g) at 25 °C within 120 min. Adsorption followed the Langmuir model (R²=0.99), indicating chemical adsorption. Sil@ZIF67-Hmim was subjected to repeated solid phase extraction (SPE) for five consecutive days, the recovery rate ranged from 98.1%-99.2%, and the relative standard deviation (RSD) was 3.2%-4.4%; Conclusion: Sil@ZIF67-Hmim is a high-efficiency sorbent for (+)-catechin recovery from chocolate waste, providing a novel approach for food waste valorization and highlighting the application potential of IL-modified MOF-silica composites.

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离子液体修饰ZIF67覆盖二氧化硅从食物垃圾中分离(+)-儿茶素

背景：食物垃圾中含有丰富的(+)-儿茶素，但其有效回收仍然具有挑战性。本研究旨在制备离子液体（IL）改性吸附剂，并建立固相萃取（SPE）法从巧克力废弃物中回收(+)-儿茶素的高效方法；方法：合成三种il改性吸附剂（Sil-IL, ZIF67-IL, Sil@ZIF67-IL）。在不同条件下对其吸附性能进行了评价；吸附等温线和动力学分别符合Langmuir/Freundlich模型和拟一/二阶模型。研究了巧克力废提取物的吸附剂稳定性和(+)-儿茶素的回收率；结果：Sil@ZIF67-Hmim在25℃条件下，120 min内吸附量最高（154.4 mg/g）。吸附符合Langmuir模型（R²=0.99），表明化学吸附。Sil@ZIF67-Hmim连续5 d进行重复固相萃取（SPE），回收率为98.1% ~ 99.2%，相对标准偏差（RSD）为3.2% ~ 4.4%；结论：Sil@ZIF67-Hmim是一种从巧克力垃圾中回收(+)-儿茶素的高效吸附剂，为食品垃圾的价值化提供了新的途径，突出了il改性mof -二氧化硅复合材料的应用潜力。

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