Sustainable Drying and Green Deep Eutectic Extraction of Carotenoids from Tomato Pomace. 2022

Celeste Lazzarini, and Enrico Casadei, and Enrico Valli, and Matilde Tura, and Luigi Ragni, and Alessandra Bendini, and Tullia Gallina Toschi
Department of Agricultural and Food Sciences (DISTAL), Alma Mater Studiorum-Università di Bologna, Piazza Goidanich 60, 47521 Cesena, Italy.

The extraction of molecules with high added value plays an important role in the recovery of food waste. This work aimed to valorize tomato pomace, a by-product composed of skin and seeds, through extraction of carotenoids, especially lycopene and β-carotene. The tomato pomace was dried using three different methods (freeze-drying, heat drying, and non-thermal air-drying) to reduce its weight, volume, and water activity and to concentrate the carotenoid fraction. These drying approaches were compared considering the extractive potential. Three solvent mixtures were compared, a traditional one (n-hexane:acetone) and two green deep eutectic solvent mixtures (ethyl acetate:ethyl lactate and menthol:lactic acid) in combination with different drying procedures. The extract obtained using ethyl acetate:ethyl lactate with non-thermal air-drying showed the highest contents of lycopene and β-carotene (75.86 and 3950.08 µg/g of dried sample, respectively) compared with the other procedures.

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