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Currently, the use of agro-industrial waste represents a viable alternative for obtaining valuable compounds that, in the case of biorefineries, is an opportunity for improvement. In this context, the aim of our study was to determine the flavonoid content and the antioxidant capacity of 30 byproducts from fruit processing in Colombia and propose possible applications. We analyzed the antioxidant capacity of the ethanolic extracts from each byproduct using the ferric reducing antioxidant power (FRAP) and the reducing power of antioxidant activity (RPAA) assays, as well as the oxygen radical absorbance capacity (ORAC) test. We found that tree tomato peels and stem and peach peels had a high flavonoid content, with values greater than 8,271.82 ± 702.70 μg quercetin per gram of dry sample. We also found that mango (22,676.57 ± 759.71 μg TE1/g Sdb, 3,692.38 ± 92.67 μg GAE/g Sdb), soursop (22,117.13 ± 754.94 μg TE1/g Sdb, 4,858.79 ± 156.71 μg GAE/g Sdb, 14,713.39 ± 757.95 μg TE2/g Sdb), grape (17,027.85 ± 765.11 μg TE1/g Sdb, 13,395.15 ± 659.31 μg TE2/g Sdb), peach peels (17,910.21 ± 1,424.33 μg TE2/g Sdb) and seeds (4,316.46 ± 112.00 μg GAE/g Sdb, 20,093.32 ± 1,317.93 μg TE2/g Sdb), and grape stalk (3,552.26 ± 31.63 μg GAE/g Sdb) showed a high antioxidant capacity in the different tests performed. Our results demonstrate that fruit byproducts have potential use in the pharmaceutical, food, and cosmetic industry due to their flavonoids content and their high antioxidant capacity.

Prospective use of fruit byproducts in Colombia according to their antioxidant capacity