Chemat, Aziade and Touraud, Didier and Mueller, Rainer and Kunz, Werner and Fabiano-Tixier, Anne-Sylvie (2024) Valorization of Coffee Silverskin Using Extraction Cycles and Water as a Solvent: Design of Process. MOLECULES, 29 (6): 1318. ISSN 1420-3049
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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).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ANTIOXIDANT CAPACITY; CAFFEINE; SOLUBILITY; INGREDIENT; ACID; coffee; silverskin; extraction; water; cycles; enrichment |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Dec 2025 05:51 |
| Last Modified: | 10 Dec 2025 05:51 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64459 |
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