Molecules, Vol. 29, Pages 1318: Valorization of Coffee Silverskin Using Extraction Cycles and Water as a Solvent: Design of Process

Molecules, Vol. 29, Pages 1318: Valorization of Coffee Silverskin Using Extraction Cycles and Water as a Solvent: Design of Process
Molecules doi: 10.3390/molecules29061318
Authors:
Aziadé Chemat
Didier Touraud
Rainer Müller
Werner Kunz
Anne-Sylvie Fabiano-Tixier

Coffee silverskin is a byproduct of the coffee industry, appearing in large quantities during the roasting step. In this work, a sober and simple water process is proposed, using extractions cycles, to produce valuable products including (a) an extract rich in caffeine, (b) possibly pure caffeine, and (c) insoluble fibers. The hypothetical number of necessary cycles was calculated and compared to the number of cycles used experimentally. Two types of cycles, with and without water compensation, were compared for their water consumption and the amount of caffeine extracted. The use of cycles, with the resulting product from a previous extraction as a solvent for fresh biomass, drove a significant rise in the content of caffeine determined by a UV–visible detector with a spectrophotometer and ultra-performance liquid chromatography (UPLC). After 11 extraction cycles with water compensation, we obtained an extract 4.5 times more concentrated in caffeine (4.25 mg/mL) than after a single extraction (1.03 mg/mL).

Source: Molecules - March 15, 2024 Category: Chemistry Authors: Aziad é Chemat Didier Touraud Rainer M üller Werner Kunz Anne-Sylvie Fabiano-Tixier Tags: Article Source Type: research