Purification and Identification of Antioxidant Peptides from Hydrolysates of Large Yellow Croaker (Pseudosciaena crocea) Scales

摘要

The scales of large yellow croaker (Pseudosciaena crocea^ are typically discarded as waste during processing. In this study, three peptides with high antioxidant properties were purified from the scales via ultrafiltration and column chromatography. Through matrix-assisted laser desorption ionization/time-of-flight mass spectrometry, the sequences of the three peptides were identified as Gln-Arg-Pro-Pro-Glu-Pro-Arg (M1N4-1, 879.4 Da), Glu-Lys-Val-Trp-Lys-Tyr-Cys-Asp (M1N4-2, 1070.4 Da), and Val-Gly-Leu-Pro-Gly-Leu-Ser-Gly-Pro-Val-Gly (M2N2-1, 952.5 Da). The antioxidant activity of the peptides was directly determined through 1-diphenyl-2-picrylhydrazyl scavenging assay. Results suggested that large yellow croaker scales are a good source of naturalantioxidants.