Antioxidative Effects and Mechanism Study of Bioactive Peptides from Defatted Walnut ( Juglans regia L. ) Meal Hydrolysate

peer-reviewed · Journal of Agricultural and Food Chemistry · 2019

peer-reviewed · Journal of Agricultural and Food Chemistry · 2019. Jianyong Sheng et al. The peptide components of defatted walnut (Juglans regia L.) meal hydrolysate (DWMH) remain unclear…
Date 2019-03-27
Type peer-reviewed
Venue Journal of Agricultural and Food Chemistry
Publisher American Chemical Society (ACS)
Contribution downstream-application
DOI 10.1021/acs.jafc.8b05722
Citations (OpenAlex) 94

Abstract

The peptide components of defatted walnut (Juglans regia L.) meal hydrolysate (DWMH) remain unclear, hindering the investigation of biological mechanisms and exploitation of bioactive peptides. The present study aims to identify the peptide composition of DWMH, followed by to evaluate in vitro antioxidant effects of selected peptides and investigate mechanisms of antioxidative effect. First, more than 1 000 peptides were identified by de novo sequencing in DWMH. Subsequently, a scoring method was established to select promising bioactive peptides by structure based screening. Eight brand new peptides were selected due to their highest scores in two different batches of DWMH. All of them showed potent in vitro antioxidant effects on H 2 O 2 -injured nerve cells. Four of them even possessed significantly stronger effects than DWMH, making the selected bioactive peptides useful for further research as new bioactive entities. Two mechanisms of hydroxyl radical scavenging and ROS reduction were involved in their antioxidative effects at different degrees. The results showed peptides possessing similar capacity of hydroxyl radical scavenging or ROS reduction may have significantly different in vitro antioxidative effects. Therefore, comprehensive consideration of different antioxidative mechanisms were suggested in selecting antioxidative peptides from DWMH.

Authors

  1. Jianyong Sheng · Huazhong University of Science and Technology
  2. Xiaoyu Yang · Huazhong University of Science and Technology
  3. Jitang Chen · Huazhong University of Science and Technology
  4. Tianhao Peng · Huazhong University of Science and Technology
  5. Xiquan Yin · Huazhong University of Science and Technology, Infinitus (China)
  6. Wei Liu (Huazhong University of Science and Technology) · Huazhong University of Science and Technology
  7. Ming Liang · Huazhong University of Science and Technology, Infinitus (China)
  8. Jiangling Wan · Huazhong University of Science and Technology
  9. Xiangliang Yang · Huazhong University of Science and Technology

Methods and tools

  • Walnut meal antioxidative peptides: Over a thousand peptides in defatted walnut meal hydrolysate were identified by de novo sequencing, and eight selected peptides showed antioxidant effects on injured nerve cells.

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