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Article Dans Une Revue Clean Technologies Année : 2021

Study of Influential Parameters of the Caffeine Extraction from Spent Coffee Grounds: From Brewing Coffee Method to the Waste Treatment Conditions

Résumé

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 temper-ature, the extraction time and the solid/liquid ratio; and iv) the liquid/liquid purification param-eters 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 caf-feine 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−1 SCG 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−1 SCG. When using ethyl acetate, 93.4% of the caffeine has been se-lectively recovered by liquid/liquid extraction. Finally, the extraction of caffeine for the valoriza-tion of spent coffee grounds is a promising and easy way, which fits with an already important and well established market.

Domaines

Génie chimique
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Dates et versions

hal-03188993 , version 1 (02-04-2021)

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Alexandre Vandeponseele, Micheline Draye, Christine Piot, Gregory Chatel. Study of Influential Parameters of the Caffeine Extraction from Spent Coffee Grounds: From Brewing Coffee Method to the Waste Treatment Conditions. Clean Technologies, 2021, 3 (2), pp.335-350. ⟨10.3390/cleantechnol3020019⟩. ⟨hal-03188993⟩
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