Opportunities and Methods for Using Fluorescent Gel as a Proxy for Pathogen Transfer in Biosecurity Research

Area of Science:

• Agricultural science
• Microbiology
• Public health

Background:

• Glo Germ fluorescing material is widely used for demonstrating and researching contaminant transfer.
• Understanding its properties is crucial for effective application in agriculture and beyond.

Purpose of the Study:

• Quantify the relationship between gel area density and luminance.
• Identify key factors influencing Glo Germ gel transfer between surfaces.

Main Methods:

• Applied varying densities of Glo Germ gel to paper, plastic, and rubber surfaces.
• Analyzed digital images under UV light for luminance and measured mass changes.
• Conducted gel transfer tests with wet and dried material on different surfaces.

Main Results:

• Luminance remained constant during gel evaporation.
• Luminance increased with density up to a specific threshold for each surface.
• Wet gel transfer was more quantifiable on the receptor than the source; dried gel showed no transfer.

Conclusions:

• Fluorescent gel luminance is a stable indicator of contamination, even with evaporation.
• Luminance thresholds define optimal application densities for imaging purposes.
• Gel transfer is effective only when wet, supporting its role in contamination research and demonstration.