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DBT degradation enhancement by decorating Rhodococcus erythropolis IGST8 with magnetic Fe3O4 nanoparticles
F Ansari1, P Grigoriev, S Libor
1Microsystems & Nanotechnology Centre, Cranfield University, Bedfordshire MK430AL, UK. f.ansari@cranfield.ac.uk
Biotechnology and Bioengineering
|November 18, 2008
Summary
Magnetic nanoparticles enhance Rhodococcus erythropolis IGST8 bacteria for biodesulfurization (BDS) of dibenzothiophene (DBT). This boosts efficiency by increasing cell membrane permeability, facilitating easier separation of bacteria post-reaction.
Area of Science:
- Environmental Microbiology
- Biotechnology
- Materials Science
Background:
- Dibenzothiophene (DBT) is a persistent organic pollutant found in fossil fuels.
- Biodesulfurization (BDS) offers an eco-friendly method for removing sulfur compounds.
- Efficient separation of microbial catalysts is crucial for industrial BDS applications.
Purpose of the Study:
- To enhance the biodesulfurization activity of Rhodococcus erythropolis IGST8.
- To facilitate the magnetic separation of bacteria after the desulfurization process.
- To investigate the effect of magnetic Fe3O4 nanoparticles on bacterial membrane permeability.
Main Methods:
- Synthesis of magnetic Fe3O4 nanoparticles (45-50 nm) via a chemical method.
- Decoration of Rhodococcus erythropolis IGST8 with Fe3O4 nanoparticles.
- Scanning Electron Microscopy (SEM) to confirm nanoparticle coating.
- Assay of DBT desulfurization activity in Basic Salt Medium (BSM).
- Black Lipid Membrane (BLM) experiments to assess membrane permeability.
Main Results:
- SEM confirmed substantial coating of bacteria with Fe3O4 nanoparticles.
- Magnetically decorated cells exhibited 56% higher DBT desulfurization activity compared to non-decorated cells.
- BLM experiments indicated that nanoparticles enhance membrane permeability.
Conclusions:
- Fe3O4 nanoparticle decoration significantly improves the biodesulfurization efficiency of Rhodococcus erythropolis IGST8.
- Enhanced membrane permeability is proposed as the mechanism for increased activity.
- Magnetic decoration facilitates easier post-reaction separation, paving the way for industrial applications.
