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An Economical Bioprocess for Lipopeptide Production From Bacillus subtilis
Derya Maral-Gül1, Zülal Günay1, Baran Mis2
1Department of Bioengineering, Graduate School of Natural and Applied Sciences, Ege University, Bornova, Izmir, Turkey.
Microbiologyopen
|May 8, 2026
Summary
Bacillus strains produce antifungal lipopeptides (LPs) to combat plant pathogens like Fusarium solani. Optimized conditions significantly boosted Bacillus subtilis 4-Ka-22
Area of Science:
- Agricultural Microbiology
- Biotechnology
- Plant Pathology
Background:
- Phytopathogenic fungi cause substantial crop losses globally.
- Lipopeptides (LPs) from Bacillus species show promise as natural antifungal agents.
- Optimizing LP production is crucial for agricultural applications.
Purpose of the Study:
- To investigate the lipopeptide (LP) production capabilities of Bacillus isolates.
- To select the optimal Bacillus strain and optimize its production medium and parameters for enhanced antifungal lipopeptide yield.
- To evaluate the antifungal efficacy of produced lipopeptides against key plant pathogens.
Main Methods:
- Screening of 69 Bacillus isolates for hemolytic activity.
- Cultivation in Lysogeny Broth (LB) for lipopeptide extraction.
- Antifungal activity assay using the agar well diffusion method.
- Analysis of iturin and surfactin content via mass spectrometry.
- Optimization of production medium and parameters for selected Bacillus strains.
Main Results:
- All 69 Bacillus isolates exhibited hemolytic activity.
- Bacillus subtilis 4-Ka-22 showed the highest cell growth among selected isolates.
- Optimized medium (0.1% molasses, 1% soybean meal, 0.5% CaCl2, 1% glycerol) and parameters (30°C, 195 rpm, pH 5, 4.3% inoculum) increased cell growth 13.4-fold compared to LB medium.
Conclusions:
- Bacillus subtilis 4-Ka-22 is a potent producer of antifungal lipopeptides.
- The optimized production strategy significantly enhances Bacillus cell growth and lipopeptide yield.
- This study provides a cost-effective method for producing antifungal lipopeptides for crop protection.
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