Isolation and identification of antioxidative peptides from frog (Hylarana guentheri) protein hydrolysate by consecutive chromatography and electrospray ionization mass spectrometry.
Frog (Hylarana guentheri) proteins were hydrolyzed by papain and Flavourzyme to obtain antioxidative peptides. The antioxidant activities of the frog protein hydrolysates (FPHs) were measured, including 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity (IC50=9.94±0.13 mg/mL), reducing power (0.39±0.01 at 5.0 mg/mL), and oxygen radical absorbance capacity (ORAC) value (789.15±75.10 μmol Trolox equivalents/g). The hydrolysates were purified by ultrafiltration, ion exchange chromatography, gel filtration chromatography, and reverse-phase high-performance liquid chromatography (RP-HPLC). Through analysis of ESI-MS/MS, two dipeptides were identified as Leu/Ile-Lys (259.1607 Da) and Phe-Lys (293.1446 Da), respectively.
College of Light Industry and Food Science, South China University of Technology, Guangzhou, 510641, China.
Min
M
Gu
Jiaoyan
J
Ren
Weizheng
W
Sun
Lijun
L
You
Bao
B
Yang
Mouming
M
Zhao
D000595:Amino Acid Sequence; D029845:Amphibian Proteins / Q000378:metabolism*; D000818:Animals; D002845:Chromatography; D016166:Free Radical Scavengers / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006868:Hydrolysis; D010446:Peptide Fragments / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D011898:Ranidae; D021241:Spectrometry, Mass, Electrospray Ionization; D014462:Ultrafiltration
D029845:Amphibian Proteins; D016166:Free Radical Scavengers; D010446:Peptide Fragments