ArticleArchives of microbiology2025
Bioconversion of olive mill wastewater into rhamnolipids with biostimulant potential.
Article in Archives of microbiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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5 authors.
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Abstract
This study explores the sustainable production and multifunctional applications of rhamnolipids synthesized by Pseudomonas aeruginosa using olive mill wastewater (OMW) as a low-cost, renewable substrate. Under optimized conditions (pH 7, 30 °C, 120 rpm), the culture achieved a high biomass density (OD = 13.51 ± 0.48). Biosurfactant production was confirmed by a reduction in surface tension (42.0 mN/m), a strong emulsification index (72.22%), and enhanced oil displacement compared to synthetic surfactants. The rhamnolipid yield reached 6 g/L. Antimicrobial assays showed no inhibitory effect against E. coli, S. aureus, or S. typhimurium at concentrations up to 3 g/L, indicating a low toxicity profile. Seed germination assays revealed significant stimulation in Trigonella foenum-graecum and Zea mays, with peak germination indices of 151.71% and 176.83% at 0.5 g/L and 0.75 g/L, respectively. The novelty of this study lies in the dual approach of simultaneous OMW detoxification and the production of rhamnolipids with plant growth-promoting potential. Overall, this work highlight the promise of rhamnolipids as eco-friendly agents for agricultural applications, while contributing to waste valorization and environmental protection.
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