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<p>The production of petrochemical substitutes through the biological conversion of renewable biomass is gaining attention as an eco-friendly process. Surfactin is highly regarded as an effective biosurfactant for commercial uses. In this study, we developed a fed-batch fermentation process for lipopeptide production using turnip peel, an agricultural waste biomass rich in neutral sugars, as a co-substrate. Fermentation was initiated in a medium containing both turnip peel and glucose as co-substrates. Overflowing foam was collected into a foam tank, and the reduced volume was replenished with fresh media containing turnip peel. Compared with glucose-only fermentation, the co-substrate system increased total lipopeptide production and appeared to promote a relative increase in the proportion of surfactin among the produced lipopeptides. Moreover, the lipopeptides obtained from the co-substrate fermentation exhibited a lower critical micelle concentration and a higher emulsification index, suggesting enhanced surface activity. These findings demonstrate that turnip peel can serve as a cost-effective and sustainable resource for improving surfactin production while maintaining product distribution and enhancing functional performance.</p>

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Enhanced lipopeptide production by Bacillus subtilis via controlled fed-batch fermentation using turnip peel as a sustainable substrate

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Jun Hyuk Oh,
  • Jong Geun Yoo,
  • Bum Jun Jang,
  • Jae Ahn Shin,
  • Young-Jin Ryu,
  • Hwa Sung Shin

摘要

The production of petrochemical substitutes through the biological conversion of renewable biomass is gaining attention as an eco-friendly process. Surfactin is highly regarded as an effective biosurfactant for commercial uses. In this study, we developed a fed-batch fermentation process for lipopeptide production using turnip peel, an agricultural waste biomass rich in neutral sugars, as a co-substrate. Fermentation was initiated in a medium containing both turnip peel and glucose as co-substrates. Overflowing foam was collected into a foam tank, and the reduced volume was replenished with fresh media containing turnip peel. Compared with glucose-only fermentation, the co-substrate system increased total lipopeptide production and appeared to promote a relative increase in the proportion of surfactin among the produced lipopeptides. Moreover, the lipopeptides obtained from the co-substrate fermentation exhibited a lower critical micelle concentration and a higher emulsification index, suggesting enhanced surface activity. These findings demonstrate that turnip peel can serve as a cost-effective and sustainable resource for improving surfactin production while maintaining product distribution and enhancing functional performance.