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<p>Lignocellulosic waste is a promising alternative for reducing raw material costs for the microbial production of biosurfactants – amphiphilic biomolecules with promising tensoative and emulsifying properties. The current study promoted the valorization of sunflower stalk by using it as a partial substitute for glucose in the production of biosurfactants by <i>Bacillus subtilis</i> LMA-ICF-PC 001. The liquor obtained after an alkaline pretreatment of sunflower stalk samples was rich in hemicelluloses (67.30%) but did not present any growth-inhibitory compounds, such as furfural and hydroxymethylfurfural. A central composite design (CCD) was performed considering hemicellulosic liquor from sunflower stalk, glucose, and mineral salt solution as independent variables. The biosurfactant had a strong capacity for surface tension reduction (58.70%) in media containing 8.16% hemicellulosic liquor, 1.02% glucose, and 1.61% mineral salt solution. Results also indicated that the biosurfactant obtained at 8.16% hemicellulosic liquor, 4.02% glucose, and 1.61% mineral salt solution showed an affinity for emulsifying open-chain hydrocarbons, such as hexane (57.23%). These results highlight the potential of sunflower stalk as a cost-effective and sustainable substrate for biotechnological applications.</p>

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A statistical approach for the valorization of hemicellulosic liquor from sunflower stalk in biosurfactant production

  • 期刊论文

  • 发表日期：

    2025年4月12日

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  • Aline Alves Oliveira Santos Prado,
  • Brenda Lohanny Passos Santos,
  • Kayque Silva Brasil,
  • Isabela Maria Monteiro Vieira,
  • Larissa Castor Ramos,
  • Roberto Rodrigues de Souza,
  • Daniel Pereira Silva,
  • Denise Santos Ruzene

摘要

Lignocellulosic waste is a promising alternative for reducing raw material costs for the microbial production of biosurfactants – amphiphilic biomolecules with promising tensoative and emulsifying properties. The current study promoted the valorization of sunflower stalk by using it as a partial substitute for glucose in the production of biosurfactants by Bacillus subtilis LMA-ICF-PC 001. The liquor obtained after an alkaline pretreatment of sunflower stalk samples was rich in hemicelluloses (67.30%) but did not present any growth-inhibitory compounds, such as furfural and hydroxymethylfurfural. A central composite design (CCD) was performed considering hemicellulosic liquor from sunflower stalk, glucose, and mineral salt solution as independent variables. The biosurfactant had a strong capacity for surface tension reduction (58.70%) in media containing 8.16% hemicellulosic liquor, 1.02% glucose, and 1.61% mineral salt solution. Results also indicated that the biosurfactant obtained at 8.16% hemicellulosic liquor, 4.02% glucose, and 1.61% mineral salt solution showed an affinity for emulsifying open-chain hydrocarbons, such as hexane (57.23%). These results highlight the potential of sunflower stalk as a cost-effective and sustainable substrate for biotechnological applications.