Verification of antioxidant activity, stability evaluation, and mechanism analysis of yak bone collagen peptide

  • WANG Zijun ,
  • XU Pengfei ,
  • ZHU Tianqing ,
  • HU Bo ,
  • GU Zhenghua ,
  • XIN Yu ,
  • GUO Zhongpeng ,
  • GUO Zitao ,
  • ZHANG Liang
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  • 1(National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing Technology, School of Biotechnology, Jiangnan University, Wuxi 214122, China)
    2(National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China)
    3(School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China)

Received date: 2024-11-27

  Revised date: 2025-02-12

  Online published: 2025-11-03

Abstract

In recent years, food-derived antioxidant peptides have attracted increasing attention in food science and medicine due to their high bioavailability and safety.The prior research identified four bioactive peptides with antioxidant properties derived from yak bone collagen, including GPPGPAGPAG (P1), GPPGPAGPAG (P2), GPAGPAGPIGPVG (P3), and GPAGPSGPAGK (P4).This study validated the antioxidant activity of these four peptides through DPPH free radical scavenging ability, Fe2+ chelating ability, hydroxyl radical scavenging ability, and ABTS cationic radical scavenging ability.Subsequently, employing DPPH free radical scavenging as the primary metric, this study examined the influence of various factors, including temperature, pH, food additives, metal ions, solar radiation, and digestion phases, on the antioxidant efficacy of the four yak bone collagen peptides.Ultimately, molecular docking techniques were utilized to model the interaction and binding dynamics between the four peptides and the Keap1 protein.Results showed that all four peptides possessed good antioxidant activity, with P1 demonstrating the highest DPPH free radical scavenging ability[(50.36±0.33)%] and P4 showing the strongest Fe2+ chelating ability[(45.99±0.32)%].Following simulated gastrointestinal digestion in vitro, the DPPH free radical scavenging ability of all peptides increased, exceeding 60%.Furthermore, the peptides generally demonstrated high antioxidant stability, retaining over 85% of their activity across various conditions.Molecular docking analyses revealed that P1, P2, and P3 could effectively bind with the key antioxidant pathway protein Keap1 through Van der Waals forces and hydrogen bonds.This study lays the groundwork for transforming yak bone collagen into natural functional foods and health supplements.

Cite this article

WANG Zijun , XU Pengfei , ZHU Tianqing , HU Bo , GU Zhenghua , XIN Yu , GUO Zhongpeng , GUO Zitao , ZHANG Liang . Verification of antioxidant activity, stability evaluation, and mechanism analysis of yak bone collagen peptide[J]. Food and Fermentation Industries, 2025 , 51(19) : 126 -134 . DOI: 10.13995/j.cnki.11-1802/ts.041706

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