Efficient Sulfamethoxazole Removal by an Isolated Strain Microbacterium esteraromaticum S13
Guihua Leng1, Yanlan Wen2, Feng Zhang3
1College of Chemistry and Bioengineering, Yichun University, 576 Xuefu Road, Yichun, 336000, Jiangxi, China.
Current Microbiology
|July 1, 2025
Summary
A novel Microbacterium esteraromaticum S13 strain effectively degrades sulfamethoxazole (SMX) and other antibiotics. Immobilization significantly enhanced SMX removal efficiency, showing great potential for environmental antibiotic remediation.
Area of Science:
- Environmental microbiology
- Bioremediation
- Antibiotic resistance
Background:
- Antibiotic pollution poses a significant environmental and health risk.
- Developing efficient microbial degradation methods is crucial for addressing this challenge.
- Sulfamethoxazole (SMX) is a widely used antibiotic frequently detected in aquatic environments.
Purpose of the Study:
- To screen and identify SMX-degrading bacteria.
- To investigate the degradation characteristics and pathways of the identified strain.
- To enhance SMX removal efficiency through immobilization.
Main Methods:
- Screening of bacterial strains for SMX degradation.
- Optimization of degradation conditions (temperature, pH, substrate concentration).
- Identification of transformation products using LC-MS.
- Immobilization of bacterial cells using polyvinyl alcohol and sodium alginate.
Main Results:
- Microbacterium esteraromaticum S13 was identified as an SMX-degrading strain.
- Optimal degradation occurred at 35°C, pH 8.0, with 100 mg/L SMX and 5 g/L glucose.
- The strain showed broad-spectrum degradation of other sulfonamide antibiotics and amoxicillin.
- Immobilized S13 cells achieved nearly 100% SMX removal within 24 hours and maintained high efficiency over multiple cycles.
Conclusions:
- Microbacterium esteraromaticum S13 is a promising candidate for SMX bioremediation.
- Immobilization technology significantly enhances the efficiency and reusability of the degrading strain.
- This study provides a foundation for developing practical strategies for removing antibiotics from the environment.
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