Macromolecular amplification of binding response in superaptamer hydrogels

Area of Science:

• Biomolecular engineering
• Nanotechnology
• Analytical chemistry

Background:

• Detecting ultralow analyte concentrations is crucial for biomedical, environmental, and security applications.
• Current methods often require complex instrumentation and signal amplification strategies.
• Macromolecular signal amplification has advanced through various polymer-based approaches.

Purpose of the Study:

• To introduce a novel aptamer-based hydrogel system for protein detection.
• To demonstrate a new category of macromolecular signal amplification using supramolecular assemblies.
• To develop a portable, naked-eye detectable biosensor for ultralow analyte concentrations.

Main Methods:

• Development of superaptamer hydrogels utilizing protein-specific aptamers.
• Exploitation of protein-aptamer interactions to induce hydrogel volume changes.
• Characterization of hydrogel response to target proteins at femtomolar concentrations.

Main Results:

• Superaptamer hydrogels exhibit visible volume shrinking in response to target proteins.
• Detection limits reach femtomolar concentrations, visible to the naked eye.
• The system maintains specificity in biological matrices like urine and tears.
• Dried hydrogels are stable for long-term storage and reusable.

Conclusions:

• A novel aptamer-based hydrogel enables visible, amplified protein detection.
• This technology offers a simple, portable, and cost-effective alternative to traditional analytical methods.
• The superaptamer hydrogel represents a significant advancement in macromolecular signal amplification for biosensing.