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The objective of this work was the development of a green extraction method based on the use of a deep eutectic solvent (DES) to extract caffeine from coffee pulp (CP). Choline chloride and glycerol were used as hydrogen bond acceptor and hydrogen bond donor, respectively. ATR-FTIR and viscosity measurements were conducted for the characterization of DES mixtures. The effects of DES mixtures concentration (CDES), liquid-to-solid ratio (L/S), extraction temperature (T) on caffeine extraction yield (CCaf) and extract antiradical activity (AAR) were studied, and the extraction process was optimized. The optimum of extraction was achieved at a temperature of 55 °C, a solvent/pulp ratio of 47 mL/g, and a DES concentration of 70% w/v in aqueous solution. In addition, a mathematical model to describe the kinetic mechanisms of the extraction was developed, whereas the dependence of the best descriptive model constants on extraction variables was expressed by an appropriate model. These results would offer scientific reference for promoting the valorization of coffee pulp.
Loukri et al. (Fri,) studied this question.