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Obtaining an extract rich in carotenoids with antioxidant capacity on a bank scale from agro-industrial residues of tree tomato (Solanum betaceum)

Abstract:

Carotenoids are the chemical compounds with the most significant presence in tomato peels; they are natural pigments with antioxidant capacity; these are extracted using organic solvents such as ethanol. In this research, a carotenoid extraction was carried out using ethanol with a plant material / solvent volume ratio of 1/70 in the volumes of 0.5 L, 3 L, and 5 L. The extracts were physically chemically characterized, and the means were compared obtained from each test for a significance level of 95%, obtaining for the bench-scale an extract with a refractive index of 1.36, the kinematic viscosity of 2.09 cSt.s-1, lycopene concentration of 0.51 mg.L-1 and efficiency of the extraction process of 34.34 mg.k-1, showing no significant differences with the laboratory scales (0.5 L and 3 L). The values of the percentage of humidity and pH on the bench scale were 99.90% and 5.69, respectively, presenting significant differences between the three scales. The extract obtained on a bench scale with maltodextrin and gum Arabic polymers was microencapsulated by spray drying, obtaining a 99.39% microencapsulation efficiency, by infrared spectroscopy, the presence of carotenoids within the microcapsules was corroborated. Microcapsules were obtained with a DPPH inhibition percentage of 21.72%, equivalent to a Trolox concentration of 142.72 µmol. L-1