Corksorb Enhances Alkane Degradation by Hydrocarbonoclastic Bacteria

Area of Science:

• Environmental Microbiology
• Bioremediation
• Marine Pollution

Background:

• Biosorbent materials are effective for oil spill cleanup.
• The impact of biosorbents on hydrocarbon-degrading bacteria remains largely unknown.
• Understanding bacterial responses to biosorbents is crucial for optimizing bioremediation strategies.

Purpose of the Study:

• To investigate the effect of corksorb, a cork-based biosorbent, on the growth and alkane degradation capabilities of hydrocarbonoclastic bacteria.
• To elucidate the mechanisms underlying corksorb's influence on bacterial activity.
• To assess the potential of corksorb for enhancing in situ bioremediation of marine oil spills.

Main Methods:

• Culturing of Rhodococcus opacus B4 and Alcanivorax borkumensis SK2 with and without corksorb.
• Quantification of alkane degradation and bacterial growth.
• Gene expression analysis (transcriptomics) to assess metabolic activity.
• Scanning electron microscopy (SEM) to visualize bacterial-biosorbent interactions.

Main Results:

• Corksorb significantly enhanced alkane degradation by Rhodococcus opacus B4 (96%) and Alcanivorax borkumensis SK2 (72%).
• Bacterial growth, particularly of Alcanivorax borkumensis SK2 (51% increase), was promoted by corksorb.
• Transcriptomic analysis revealed increased expression of rRNA and tRNA genes, indicating higher metabolic activity.
• SEM images and gene expression data suggest cell attachment to corksorb enhances bacterial activity, rather than soluble factors.

Conclusions:

• Corksorb acts as a beneficial substrate for hydrocarbonoclastic bacteria, enhancing both growth and alkane biodegradation.
• Bacterial attachment to the biosorbent surface is a key factor driving improved activity.
• Corksorb shows significant potential for combined sorption and enhanced biodegradation in marine oil spill scenarios, improving in situ bioremediation.