Multiplex Analysis on a Single Porous Hydrogel Bead with Encoded SERS Nanotags

Area of Science:

• Biomedical engineering
• Nanotechnology
• Analytical chemistry

Background:

• Bead-based assays are increasingly important in biomedical research.
• Multiplex analysis allows for simultaneous detection of multiple analytes.
• Existing methods face limitations in sensitivity and dynamic range.

Purpose of the Study:

• To develop a novel, highly sensitive multiplex analysis method.
• To leverage porous hydrogel beads (PHB) and surface-enhanced Raman scattering (SERS) nanotags for enhanced detection.
• To improve the linear dynamic range (LDR) of bead-based assays.

Main Methods:

• Fabrication of core-shell SERS nanotags encoded with Raman dyes (RDs).
• Encoding nanotags onto porous hydrogel beads (PHB) for multiplexing.
• Utilizing the high surface area to volume ratio (SVR) of PHB for signal amplification.
• Employing SERS for sensitive detection of encoded nanotags.

Main Results:

• Demonstrated successful multiplex analysis on a single PHB.
• Achieved significantly improved sensitivity due to SERS signal amplification and PHB's high SVR.
• Extended the linear dynamic range (LDR) of the multiplex assay.
• The combination of RDs, core-shell nanotags, and PHB resulted in enhanced analytical performance.

Conclusions:

• The proposed method offers a powerful platform for sensitive and quantitative multiplex analysis.
• This approach holds significant potential for applications in biosensing and diagnostics.
• The novel combination of PHB and SERS nanotags represents a breakthrough in bead-based assay technology.