Resumo

GALEANA-LOPEZ, José Andrés et al. Corn husk extracts as an antioxidant additive in diets for Nile tilapia (Oreochromis niloticus) fingerlings: Effect on growth performance, feed intake and toxicity. Biotecnia [online]. 2020, vol.22, n.2, pp.147-154.  Epub 07-Ago-2020. ISSN 1665-1456.  https://doi.org/10.18633/biotecnia.v22i2.1256.

Corn stover, a corn harvest by-product, can be used to add value to feeds for farmed fish through their extracts, which are rich in phenolic compounds (PCs) and could confer antioxidant properties and possible health benefits to fish. In this study, PCs from corn husk extracts (CHE) were identified by ultra-performance liquid chromatography-electrospray ionization-quadrupole time of fly-mass spectroscopy (UPLC-ESI-Q-ToF-MS/MS), and used to provide antioxidant potential to diets for Nile tilapia fingerlings. Three experimental diets for tilapia were formulated with 0, 100 and 200 mg PCs from CHE/kg feed and their antioxidant capacity was determined by DPPH• and ORAC assays. A total of 180 Nile tilapia fingerlings (0.35 ± 0.06 g) were fed for 14 days to determine the effect of experimental diets on feed intake and growth performance. PCs from CHE such as ferulic, p-coumaric and chlorogenic acids were the most abundant. The inclusion of PCs into tilapia diets increases linearly (p < 0.05) their antioxidant capacity (DPPH and ORAC). Growth performance and feed intake increased linearly (p < 0.05) as the level of CHE inclusion increased. Results suggest that the CHE can provide antioxidant potential to tilapia diets, promote growth performance and feed intake without toxic effects.

Palavras-chave : Phenolic compounds; antioxidants; tilapia; corn by-products.

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