Studies on visual detection and surface modification testing of glass microfiber filter paper based biosensor.

Area of Science:

• Biomaterials Science
• Biosensor Technology
• Surface Chemistry

Background:

• Glass microfibers are essential components in optical biosensors, serving as biomolecule adsorption media and structural elements.
• Improving the performance of these components is critical for advancing biosensor capabilities.
• Traditional methods can offer simple yet effective solutions for sensor development.

Purpose of the Study:

• To investigate the surface modification of glass microfiber paper using 3-aminopropyltriethoxysilane (APTES).
• To evaluate the impact of APTES modification on cell entrapment and DNA sequence binding.
• To establish a method for validating APTES surface coverage for biosensor applications.

Main Methods:

• Surface modification of glass microfiber paper with APTES.
• Assessment of cell entrapment capacity using Gram staining.
• Evaluation of DNA sequence binding using the fluorescent stain YOYO-1.
• Analysis of YOYO-1 emission profiles to distinguish between glass-adsorbed and DNA-bound forms.

Main Results:

• APTES modification visually enhanced cell entrapment capacity, validated by Gram staining.
• DNA binding assessment was less straightforward, requiring visualization with YOYO-1.
• YOYO-1 adsorption onto unmodified glass was observed, affecting DNA-YOYO-1 interactions.
• Distinct YOYO-1 emission profiles indicated successful APTES coverage, differentiating it from non-specific adsorption.

Conclusions:

• APTES surface modification improves cell entrapment on glass microfiber paper.
• A novel method using YOYO-1 emission distinguishes APTES surface coverage, crucial for biosensor development.
• This approach provides a reliable validation for surface modification, essential for precise control over biosensor performance and interaction kinetics.