Sequential extraction of industrial spent coffee grounds using pressurized fluids as solvents

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL Journal of Supercritical Fluids Pub Date : 2024-12-27 DOI:10.1016/j.supflu.2024.106503

Akel F. Kanaan, Kallynca C. dos Santos, Maria A.H. Menezes, Fabiane Hamerski, Fernando A.P. Voll, Marcos L. Corazza

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Abstract

This study explores the sequential extraction of valuable compounds from industrial spent coffee grounds (SCG) using sustainable pressurized fluid methods: compressed propane (CPE), pressurized liquid extraction (PLE), and supercritical CO₂ with ethanol (coscCO₂). The extracts were analyzed for yield, fatty acid profile, total phenolic content (TPC), and antioxidant activity (AA). Sequential extractions increased the total extraction yield by up to 9.0 % and 6.2 % when PLE or coscCO₂ followed CPE, respectively. Optimal conditions were PLE at 80°C, 100 bar, 6 mL/min, yielding 6258 ± 521 mg GAE.100/g TPC and 22957 ± 206 µmol TE.100/g AA, and coscCO₂ at 80°C, 200 bar, 2 mL/min, yielding 2154 ± 56 mg GAE.100/g TPC and 4196 ± 140 µmol TE.100/g AA. These results highlight the efficiency of sequential extraction for recovering bioactive compounds from SCG, promoting sustainable waste valorization.

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用加压流体作溶剂连续提取工业废咖啡渣

本研究探索了采用可持续的加压流体方法从工业废咖啡渣（SCG）中顺序提取有价值的化合物：压缩丙烷（CPE）、加压液体萃取（PLE）和乙醇超临界CO2 （coscCO2）。对提取物的产率、脂肪酸谱、总酚含量（TPC）和抗氧化活性（AA）进行分析。连续提取时，总提取率分别提高了9.0 %和6.2 %。最优条件请耐心在80°C, 100 酒吧,6 毫升/分钟,6258年收益率 ± 521 毫克GAE.100 / g TPC和22957年 ± 206µ摩尔TE.100 / g AA,和coscCO2在80°C, 200 酒吧,2 毫升/分钟,产生2154 ± 56 mg GAE.100 / g TPC和4196年 ± 140µ摩尔TE.100 / g AA。这些结果强调了顺序提取从SCG中回收生物活性化合物的效率，促进了废物的可持续增值。

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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.