analysis and tests of the tuna dark muscle hydrolysate anti-oxidation effect.

Hydrolysate is a mixture of various peptides with specific functions. However, functional identification of hydrolysate with high throughput is still a difficult task. Furthermore, using tests animal or cell experiments is time and labor-intensive. In this study, the peptides component of hydrolysate derived from the tuna dark muscle was measured MALDI-TOF/TOF-MS, and the functions of the KEFT (Lys-Glu-Phe-Thr), EEASA (Glu-Glu-Ala-Ser-Ala) and RYDD (Arg-Tyr-Asp-Asp) peptides, which were found with the highest proportion, were predicted Discovery Studio 2016 software. All three peptides were predicted to bind to the Keap1 protein with the highest fit-value and to affect the activity of Keap1, which is involved in anti-oxidation pathways. Subsequently, mice experiments showed that administration of tuna dark muscle hydrolysate increased the levels of superoxide dismutase and glutathione peroxidase in the serum and liver ( < 0.05) and decreased the malondialdehyde level ( < 0.05) as well as transcription of Keap1 ( > 0.05), which are consistent with the analysis results using Discovery Studio 2016 software. The combination of analysis and tests provided an alternative strategy for identifying hydrolysate function and provided insight into high-value utilization of protein hydrolysate.