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Decaffeination of yerba mate (Ilex paraguariensis) by pressurized liquid CO2 extraction: A feasible process?
The Journal of Supercritical Fluids ( IF 3.4 ) Pub Date : 2024-07-26 , DOI: 10.1016/j.supflu.2024.106368
L.I. Granone , F.A. Sánchez , P. Hegel , S. Pereda

This work introduces a pumpless high-pressure Soxhlet cross-current solid-liquid extraction method using liquid CO 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 CO 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.

中文翻译:


通过加压液体 CO2 萃取对马黛茶(Ilex paraguariensis)进行脱咖啡因:可行的工艺吗?



本工作介绍了一种使用液态 CO 和水合乙醇的无泵高压索氏错流固液萃取方法,用于研究马黛茶的脱咖啡因。通过将实验结果与热力学模型相结合,可以对共溶剂成分的影响进行综合评估。据观察,特定组成为 85 wt% 的乙醇/水混合物在温和的操作条件(283 K 和 4.5 MPa)下是从切碎的马黛茶叶中提取咖啡因的最佳选择,同时咖啡酰衍生物抗氧化剂的共提取可忽略不计。获得的选择性与相平衡模拟一起证明了液体二氧化碳萃取作为马黛茶脱咖啡因替代品的巨大潜力。因此,高压索氏提取作为一种简单的技术来获取有价值的实验信息,并具有进一步可扩展的半连续过程的概念设计的潜力。
更新日期:2024-07-26
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