Decaffeination of yerba mate (Ilex paraguariensis) by pressurized liquid CO2 extraction: A feasible process?

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL Journal of Supercritical Fluids Pub Date : 2024-07-26 DOI:10.1016/j.supflu.2024.106368

L.I. Granone , F.A. Sánchez , P. Hegel , S. Pereda

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Abstract

This work introduces a pumpless high-pressure Soxhlet cross-current solid-liquid extraction method using liquid CO₂ and hydrated ethanol for studying the decaffeination of yerba mate. By combining experimental results with thermodynamic modelling, a comprehensive evaluation of the impact of the co-solvent composition is achieved. It is observed that an ethanol/water mixture with a specific composition of 85 wt% is optimal under mild operating conditions (283 K and 4.5 MPa) for extracting caffeine from chopped yerba mate leaves with a negligible co-extraction of caffeoyl derivative antioxidants. The obtained selectivity, together with the phase equilibrium simulation, provide evidence of the significant potential of liquid CO₂ extraction as a decaffeination alternative for yerba mate. Thus, high-pressure Soxhlet extraction serves as simple technique to access valuable experimental information with potential for the conceptual design of further scalable semi-continuous processes.

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用加压液体二氧化碳萃取法对耶巴马黛茶（Ilex paraguariensis）进行脱咖啡因处理：可行的工艺？

本研究介绍了一种使用液态二氧化碳和水合乙醇的无泵高压索氏跨流固液萃取法，用于研究耶巴马黛茶的脱咖啡因作用。通过将实验结果与热力学模型相结合，实现了对助溶剂成分影响的全面评估。研究发现，在温和的操作条件下（283 K 和 4.5 MPa），乙醇/水混合物的特定成分为 85 wt%，是从切碎的耶巴马黛茶叶中萃取咖啡因的最佳选择，同时咖啡因酰衍生物抗氧化剂的共萃取量可以忽略不计。所获得的选择性和相平衡模拟结果证明，液态二氧化碳萃取作为耶巴马黛茶的脱咖啡因替代品具有巨大潜力。因此，高压索氏提取是获取宝贵实验信息的简单技术，具有进一步设计可扩展半连续工艺的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.