An optical microsensor to measure fluorescent light intensity in biofilms

Area of Science:

• Biophotonics
• Microbiology
• Biotechnology

Background:

• Biofilms are complex microbial communities often studied using fluorescence microscopy.
• Quantifying fluorescence intensity distribution within biofilms is challenging with current methods.
• Fluorescent proteins are widely used as reporters in biofilm research.

Purpose of the Study:

• To develop and validate a novel optical microsensor for quantifying fluorescent light intensity distribution in biofilms.
• To provide a tool for accurate and sensitive measurement of fluorescence in microbial communities.
• To enhance the study of biofilm dynamics and gene expression.

Main Methods:

• Development of an optical microsensor system including a beam splitter, light couplers, filters, and a spectrophotometer.
• Utilized a fiberoptic cable to collect emitted fluorescence from the biofilm.
• Employed numerical integration of the emission spectrum to evaluate total fluorescent light intensity.
• Tested the microsensor using Staphylococcus aureus biofilms producing yellow fluorescent protein (YFP) with 405-nm laser excitation.

Main Results:

• The optical microsensor successfully quantified fluorescent light intensity distribution in Staphylococcus aureus biofilms.
• The system measured fluorescence emission between 480 nm and 540 nm.
• Demonstrated the microsensor's capability to detect and quantify fluorescence generated by yellow fluorescent protein.

Conclusions:

• The developed fiberoptic optical microsensor is a promising tool for biofilm research.
• This technology enables precise quantification of fluorescent light intensity distribution in biofilms.
• The microsensor facilitates advanced studies on biofilm properties and microbial behavior.