One-Step Surface Modification to Graft DNA Codes on Paper: The Method, Mechanism, and Its Application

Area of Science:

• Biomaterials Science
• Analytical Chemistry
• Biosensor Technology

Background:

• Traditional glass slides for DNA immobilization have limitations including low probe density and high costs.
• Existing DNA modification methods are often time-consuming and require expensive equipment.

Purpose of the Study:

• To develop a simple, efficient, and cost-effective method for DNA immobilization on paper.
• To create a paper-based device for sensitive and specific bioassays.

Main Methods:

• One-step surface modification of paper using 3-aminopropyl trimethoxysilane (APTMS).
• Characterization of surface modification and DNA immobilization using fluorescence detection, XPS, and FT-IR.
• Development of an APTMS-modified paper-based device for pathogen detection.

Main Results:

• Achieved higher DNA immobilization efficiency on paper compared to glass slides.
• Demonstrated the mechanism involves ionic interactions between APTMS-modified paper and DNA.
• Developed a paper-based device for sensitive (22 nM detection limit) and specific detection of *Giardia lamblia*.

Conclusions:

• The APTMS method is simpler, faster, and more versatile than conventional techniques.
• Paper-based bioassays offer a low-cost alternative for point-of-care diagnostics, especially in resource-limited settings.