Study of Influential Parameters of the Caffeine Extraction from Spent Coffee Grounds: From Brewing Coffee Method to the Waste Treatment Conditions
| Autor: | Micheline Draye, Christine Piot, Alexandre Vandeponseele, Gregory Chatel |
|---|---|
| Přispěvatelé: | Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), VALORWaste |
| Rok vydání: | 2021 |
| Předmět: |
Liquid ratio
purification 020209 energy Ethyl acetate Extraction 02 engineering and technology 010501 environmental sciences biomass valorization 01 natural sciences lcsh:TD1-1066 chemistry.chemical_compound Coffee grounds [CHIM.GENI]Chemical Sciences/Chemical engineering Supercritical fluid 0202 electrical engineering electronic engineering information engineering extraction parameters lcsh:Environmental technology. Sanitary engineering lcsh:TA170-171 caffeine 0105 earth and related environmental sciences storage conditions business.industry Extraction (chemistry) General Engineering Pulp and paper industry lcsh:Environmental engineering spent coffee grounds Solvent Waste treatment chemistry Brewing Caffeine business |
| Zdroj: | Clean Technologies Clean Technologies, MDPI, 2021, 3 (2), pp.335-350. ⟨10.3390/cleantechnol3020019⟩ Clean Technologies, Vol 3, Iss 19, Pp 335-350 (2021) Volume 3 Issue 2 Pages 19-350 |
| ISSN: | 2571-8797 |
| Popis: | This article aims to study the interest of spent coffee grounds (SCG) valorization through caffeine recovery. In an original way, this study takes into account all the parameters such as (i) the brewing coffee methods (household, coffee shops, etc.) (ii) the storage conditions, in particular the drying step (iii) the solid/liquid extraction parameters such as the nature of solvent, the temperature, the extraction time and the solid/liquid ratio and (iv) the liquid/liquid purification parameters such as the nature, the volume and the pH of extraction medium. Results have shown that spent coffee grounds from coffee-shops obtained by percolation contain a higher amount of caffeine than spent coffee grounds from households obtained from spent pods or filters. A drying treatment is not required when extraction is performed under one week after the spent coffee grounds collection with 96.4% of not degraded caffeine. Solid/liquid extraction performed with 25 mL.g−1SCG of hydroalcoholic solvent (water/EtOH, v/v 60/40) at 60 °C during 15 min have given a caffeine yield up to 4.67 mg.g−1SCG. When using ethyl acetate, 93.4% of the caffeine has been selectively recovered by liquid/liquid extraction. Finally, the extraction of caffeine for the valorization of spent coffee grounds is a promising and easy way, which fits with an already important and well established market. |
| Databáze: | OpenAIRE |
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