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de Souza Mesquita, Leonardo M.; Sosa, Filipe H.B.; Contieri, Letícia S.; Marques, Priscilla R.; Viganó, Juliane; Coutinho, João A.P.; Dias, Ana C.R.V.; Ventura, Sónia P.M.; Rostagno, Maurício A.
Food chemistry, 04/2023, Volume: 406Journal Article
•Valorization of grape pomace by extracting natural pigments.•A new sustainable and economically feasible process for extracting anthocyanins.•Nicotinamide-based eutectic mixture was used to recover anthocyanins.•Stabilizing anthocyanins in SiO2 material approved in food and pharmaceutical sector.•Obtaining high-purity and thermal stable anthocyanins. Concentrated in the skins of red grapes are the anthocyanins, the primary colorants responsible for the fruits' reddish-purple color. These colorants are recognized for their significant antioxidant properties and potent nutraceutical and pharmaceutical ingredients. Nevertheless, their widespread use is compromised by the (i) need for more efficient yet sustainable downstream processes for their recovery and (ii) by the challenges imposed by their poor stability. In this work, these drawbacks were overcome by applying eutectic solvents and stabilizing agents. Besides, the anthocyanins were successfully loaded into a solid host material (approved in both food and pharmaceutical sectors) based on silicon dioxide (SiO2, loading capacity: 1extract:7silica m/m). Summing up, with the process developed, the extraction yield (21 mganthocyanins.gbiomass−1) and the stability (under 55, 75, and 95 °C) of the recovered anthocyanins were over three times better than with the conventional process. Finally, the raw materials and solvents were recycled, allowing an economical and environmentally friendly downstream process.
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