Abstract
The antioxidant and antithrombotic activities of crude rapeseed peptides (CRPs) and peptide fractions (RP25 and RP55) prepared from aqueous enzymatic extraction (AEE) of rapeseed were determined. The reducing power of RP55 and CRPs was higher than that of RP25 at the same concentrations. Rapeseed peptides exhibited marked antioxidant activities. The median effective dose (ED50) values of CRPs, RP25 and RP55 for α,α-diphenyl-β-picrylhydrazyl (DPPH) radical scavenging were 72, 499 and 41 μg/mL, respectively. The ED50 values for RP25 and RP55 for hydroxyl radicals scavenging were 2.53 and 6.79 mg/mL, respectively while the ED50 values of RP55 and CRPs for inhibition of lipid peroxidation in a liposome model system were 4.06 and 4.69 mg/mL, respectively. The inhibitory effect on lipid oxidation of RP55 was similar to that of ascorbic acid at a concentration of 5.0 mg/mL. A good positive correlation existed between the peptide concentration and antioxidant activity. RP55 generally showed more potent antioxidant activities except for hydroxyl radicals scavenging ability than RP25 and CRPs at the same concentrations, which was thought to relate to the significantly higher contents of hydrophobic amino acid, tannin, and the brown color substances in RP55. Rapeseed peptides possessed marked inhibitory activities on the thrombin-catalyzed coagulation of fibrinogen, however, their inhibitory effects were not comparable to that of heparin.
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Zhang, S.B., Wang, Z. & Xu, S.Y. Antioxidant and Antithrombotic Activities of Rapeseed Peptides. J Am Oil Chem Soc 85, 521–527 (2008). https://doi.org/10.1007/s11746-008-1217-y
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DOI: https://doi.org/10.1007/s11746-008-1217-y