Separation and Purification of Small Peptides from Fermented Sesame Meal and Their Antioxidant Activities
Xu Fazhi, Peng Huihui, Li Yang, Li Lumu, Qian Kun and Ding Xioling
Affiliation: School of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China.
Protein hydrolysates are widely applied as antioxidants in nutrition, but the potential antioxidant activities of
small peptides remain unknown. Therefore, we investigated the antioxidant activities of small peptides isolated from
solid-state fermented sesame meal via Sephadex G-15 chromotography. The scavenging capacities for 2, 2-
diphenylpicrylhydrazyl (DPPH) and hydroxyl (•OH) radicals as well as the total reducing capacity were determined. The
in vivo antioxidant activity was determined upon 30-d intragastric administration of the isolated small peptides (tripeptide,
tetrapeptide, and hexapeptide) at different doses (0.1, 0.2, and 0.4 g/kg•d) in healthy Kunming mice. The results showed
that the DPPH and •OH scavenging rates of the three peptides exceeded 80%. The total reducing activities of 4 mg/mL
tetrapeptide or hexapeptide and 2 mg/mL tripeptide were comparable to that of 0.5 mg/mL glutathione. In mice fed sesame
peptides, malondialdehyde levels in the serum and liver were lower than those in controls, whereas the activities of
liver superoxide dismutase and glutathione peroxidase were significantly higher than those in controls (P<0.05). The antioxidant
activity of tripeptide was significantly higher than those of tetrapeptide and hexapeptide (P<0.05). In conclusion,
small peptides extracted from solid-state fermented sesame meal possess strong antioxidant activities that increase with
decreasing peptide molecular weight.
Keywords: Antioxidant activity, fermented sesame meal, separation and purification, small peptides.
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