Biotechnology Bulletin ›› 2023, Vol. 39 ›› Issue (9): 58-70.doi: 10.13560/j.cnki.biotech.bull.1985.2023-0163

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Process Optimization of Multi-strain Fermented Oat Bran and Hair Efficacy Evaluation

ZHANG Yue-yi(), LAN She-yi(), PEI Hai-run, FENG Di   

  1. School of Light Industry, Beijing Technology and Business University, Beijing 100048
  • Received:2023-02-27 Online:2023-09-26 Published:2023-10-24
  • Contact: LAN She-yi E-mail:wsyy262525@126.com;lansy@th.btbu.edu.cn

Abstract:

The fermentation conditions for co-extraction of β-glucan and polypeptide from oat bran by mixed bacteria and yeast culture were optimized using single factor and orthogonal test. The fermentation broth was analyzed for antioxidant and bacteriostatic performance, as well as application in hair protection. The optimal strain mixture for fermentation contained Bacillus subtilis, Bacillus licheniformis and Saccharomyces cerevisiae at an inoculation ratio of 7∶3∶5 by detecting of the viable number of B. subtilis and B. licheniformis during fermentation. The optimized fermentation conditions, resulting in β-glucan yield at 5.98% and oat polypeptide yield at 16.21%, were found to be the ratio of solid to liquid at 1∶7.5, temperature at 30℃, inoculation volume at 2% and fermentation time for 42 h and the main and secondary order of the effects of various factors on the fermentation yield of oat bran is material liquid ratio > inoculation amount > fermentation time > fermentation temperature. The fermentation broth reduced the radical formation as the radical scavenging rate of DPPH, ABTS and hydroxyl radical was 89.00%, 99.50% and 93.01%, respectively, with IC50 of 89.35, 1.315 and 91.26 mg/mL, respectively. The antibacterial activity of the fermentation broth against Escherichia coli, Staphylostreptococcus aureus and Malassezia furfur was analyzed and the minimum inhibitory concentration was 12.5, 25 and 12.5 mg/mL, respectively. The fermentation broth had significant effect on increasing hair glossiness, repairing hair scales, reducing dry hair combing force and improving reducibility of α-keratin. Based on the detection of the target active substance content and the evaluation of its efficacy in three extraction processes, the experimental results showed that the fermentation extraction process improved the comprehensive extraction efficiency of β-glucan and peptides compared to the heating extraction method and enzymatic extraction method, and had higher activity in antioxidant, antibacterial, repairing hair scales, and reducing keratin functions.

Key words: fermentation, oat bran, multiple strains, process optimization, antioxidation, bacteriostasis, hair efficacy evaluation