Valorisation of tuna viscera by endogenous enzymatic treatment Derouiche Ben Maiz, Habiba Guadix Escobar, Emilia María Guadix Escobar, Antonio María Gargouri, Mohamed Espejo Carpio, Francisco Javier ACE-inhibitory activity antioxidant activity endogenous enzymes fish by-products functional properties Fish processing industry generates a considerable amount of by-products which represent an environmental problem. Only a small portion of these residues is used for the production of low marketable products. Therefore, industrially scalable processes yielding value-added products would be highly desirable. Different to others studies, this work deals with potential valorisation of bullet tuna (Auxis rochei) viscera using its endogenous enzymes without previous separation stage for the production of bioactive hydrolysates. Functional and bioactive properties of hydrolysates produced at different degree of hydrolysis (DH 3%, 6% and 9%) were evaluated. The endogenous enzyme hydrolysates (EH) obtained by the proposed low cost treatment were compared with hydrolysates produced with a well-known commercial enzyme: subtilisin. Regarding functional properties, EH presented similar or even better solubility, emulsifying and oil binding capacities than subtilisin hydrolysate (SH). EH also showed very interesting antioxidative properties, particularly metal reducing and radical scavenging activity. Additionally, the ACE inhibitory activity of EH at low degree of hydrolysis was comparable to SH. According to these results, bullet tuna viscera protein can be value-added by endogenous enzyme hydrolysis. 2024-02-07T10:08:35Z 2024-02-07T10:08:35Z 2019 info:eu-repo/semantics/article Habiba Derouiche Ben Maiz, Emilia M. Guadix, Antonio Guadix, Mohamed Gargouri, F.Javier Espejo-Carpio (2019). International Journal of Food Science and Technology, 54, 1100–1108 https://hdl.handle.net/10481/88527 10.1111/ijfs.14009 eng http://creativecommons.org/licenses/by-nc-sa/4.0/ info:eu-repo/semantics/openAccess Atribución-NoComercial-CompartirIgual 4.0 Internacional Wiley