Microbead-assisted PDA sensor for the detection of genetically modified organisms

Area of Science:

• Biotechnology
• Biosensing
• Materials Science

Background:

• Polydiacetylene (PDA) vesicles offer unique colorimetric responses to stimuli, making them attractive for biosensing.
• Existing PDA-based biosensors often require complex analytical instruments for signal detection.
• Detecting marker proteins in genetically modified (GM) crops is crucial for food safety and regulation.

Purpose of the Study:

• To develop a simple, sensitive, and visually detectable method for quantifying phosphinothricin acetyltransferase (PAT).
• To enhance the colorimetric signal of PDA vesicles for naked-eye or RGB analysis.
• To overcome limitations of traditional PDA biosensors by integrating them with silica microbeads.

Main Methods:

• Conjugating antibody-functionalized PDA vesicles to silica microbeads.
• Utilizing antigen-antibody interactions to induce stress and color transition in PDA vesicles.
• Employing visual inspection or RGB analysis for detecting color changes.

Main Results:

• The developed biosensor detected PAT down to 20 nM concentrations.
• Immobilization on silica microbeads significantly enhanced the blue-red color transition of PDA vesicles.
• The system enabled visual detection without requiring fluorescence microscopes or UV-Vis spectrometers.

Conclusions:

• PDA vesicles coupled with silica microbeads provide a promising platform for sensitive protein detection.
• This approach offers a simplified and accessible method for biosensing applications, including GM crop analysis.
• The enhanced colorimetric response facilitates naked-eye detection, broadening the utility of PDA-based sensors.