Visualizing Antimicrobials in Bacterial Biofilms: Three-Dimensional Biochemical Imaging Using TOF-SIMS

Area of Science:

• Life Sciences
• Analytical Chemistry
• Microbiology

Background:

• Bacterial biofilms contribute to persistent infections due to high antimicrobial resistance.
• Pseudomonas aeruginosa biofilms are a key model for studying biofilm biology and antimicrobial interactions.
• Understanding antimicrobial distribution within biofilms is crucial for combating infections.

Purpose of the Study:

• To compare two Time of Flight-Secondary Ion Mass Spectrometry (TOF-SIMS) imaging methods for analyzing bacterial biofilms.
• To investigate the distribution of antimicrobials and endogenous biochemicals within Pseudomonas aeruginosa biofilms.
• To assess the utility of TOF-SIMS for 3D imaging of biofilms in complex biological samples.

Main Methods:

• Utilized TOF-SIMS for high-resolution, sensitive chemical imaging of biofilms.
• Employed cryosectioning and depth profiling techniques to generate pseudo-3D images of biofilm structures.
• Analyzed both simple biofilms on glass slides and biofilms within an ex vivo pig lung model.

Main Results:

• Demonstrated the capability of TOF-SIMS to image antimicrobials and biochemicals within P. aeruginosa biofilms.
• Compared the effectiveness of cryosectioning and depth profiling for 3D biofilm imaging.
• Showcased the potential of TOF-SIMS for analyzing antimicrobial distribution in complex biological matrices.

Conclusions:

• TOF-SIMS is a valuable tool for the 3D imaging of bacterial biofilms and antimicrobial distribution.
• Cryosectioning and depth profiling offer complementary approaches for biofilm analysis.
• This technique holds significant promise for understanding antimicrobial efficacy and bacterial survival in complex infection models.