Abstract
Millet bran as a by-product of millet grain processing remains a reservoir of active substances. In this study, functional millet bran peptides (MBPE) were obtained from bran proteins after alcalase hydrolysis and ultrafiltration. The activity of MBPE was assessed in vitro and in the model organism Caenorhabditis elegans (C. elegans). In vitro, compared to unhydrolyzed proteins, MBPE significantly enhanced the 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2’-Azinobis-(3-ethylbenzthiazoline-6-sulphonate (ABTS) and hydroxyl radicals scavenging activity, and the scavenging rate of MBPE with 15,000 U/g alcalase reached 42.79 ± 0.31%, 61.38 ± 0.41 and 45.69 ± 0.84%, respectively. In C. elegans, MBPE at 12.5 µg/mL significantly prolonged the lifespan by reducing lipid oxidation, oxidative stress, and lipofuscin levels. Furthermore, MBPE increased the activities of the antioxidant enzymes. Genetic analyses showed that MBPE-mediated longevity was due to a significant increase in the expression of daf-16 and skn-1, which are also involved in xenobiotic and oxidative stress responses. In conclusion, this study found that MBPE had antioxidant and life-prolonging effects, which are important for the development and utilization of millet bran proteins as resources of active ingredients.
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The datasets used in the current study are available from the corresponding author on reasonable request.
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Funding
This work was supported by the Basic Research Program of Shanxi Province (202203021221015), the Shanxi Scholarship Council of China (2020-015) and the Xinghuacun College of Shanxi University (XCSXU-KF-202215).
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Chen Li: conceptualization, methodology, investigation, writing – original draft and funding acquisition. Wenjing Xu and Xiangyu Zhang: investigation, data curation and writing – original draft. Xiaodong Cui: investigation and methodology. Apollinaire Tsopmo: writing – review & editing. Jiao Li: conceptualization, writing – review & editing, project administration, and supervision.
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Li, C., Xu, W., Zhang, X. et al. Antioxidant Peptides Derived from Millet Bran Promote Longevity and Stress Resistance in Caenorhabditis elegans. Plant Foods Hum Nutr 78, 790–795 (2023). https://doi.org/10.1007/s11130-023-01100-7
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DOI: https://doi.org/10.1007/s11130-023-01100-7