Technical University of Cotopaxi, Postgraduate Direction, Faculty of Agricultural Sciences and Natural Resources, P.O. Box 050103, Latacunga, Ecuador.
Bolìvar State University, Faculty of Agricultural Sciences, Natural Resources and Environment, P.O. Box 020150, Campus Laguacoto, Guaranda, Ecuador.
Technical University of Cotopaxi, Postgraduate Direction, Faculty of Agricultural Sciences and Natural Resources, P.O. Box 050103, Latacunga, Ecuador.
https://orcid.org/0000-0001-9048-1538
Departamento de Tecnología de Alimentos, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain.
The growing demand for sustainable sources rich in protein has sparked interest in researching environmentally friendly protein sources, with seeds being a promising alternative to animal proteins. This study evaluated the antioxidant activity and functional properties of protein concentrates from banana, passion fruit and passion fruit seeds. Proximal analysis of the seeds revealed that passion fruit had the highest protein content (21.08%) compared to taxus (10.59%). Protein concentrates were obtained from the seeds by alkaline solubilization at pH 10-12 and precipitation at acidic pH (4-5). Protein quantification was performed using three methods. CPG 12-4 showed the highest protein content according to the Dumas method (65.16%) and 0.69% in Bradford, while CPT 12-5 stood out in BCA with 27.76%. Water retention capacity (WAC) ranged from 1.39 to 242 g water/g sample, oil absorption capacity (AOC) from 1.48 to 2.92 g oil/g sample, and solubility exceeded 100% in CPT at pH 9 and 12. SDS-PAGE revealed high-intensity bands of 29 kDa and 35 kDa. The phenolic compounds content was determined by ABTS, FRAP, and DPPH. It should be noted that the taxo concentrates demonstrated exceptional antioxidant capacity ranging from 7042.44 to 7770.97 µmol ET/g. The FTIR technique revealed specific functional groups as primary amines, amides, and carboxylic acids. The results of this research present the protein concentrates of these seeds as a promising source of vegetable proteins due to their valuable antioxidant compounds and techno-functional properties, contributing to the development of new nutritious and sustainable products.

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