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Synthesis of Functionalized 10-nm Polymer-coated Gold Particles for Endothelium Targeting and Drug Delivery

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Surface Functionalization of Gold Nanoparticles Using Alkyne Derivatives: Applications in Chemical Sensing.

Yun-Qiao Liu¹, Yi-Cheng Chao¹, Shun-Qiang Xu¹

¹Department of Chemistry, National Tsing Hua University, 101 Section 2, Kuang-Fu Road, Hsinchu 300044, Taiwan.

ACS Applied Materials & Interfaces

|October 19, 2024

Summary

Researchers developed a new alkyne-based method for functionalizing gold nanoparticles (AuNPs). This approach offers superior stability and efficiency compared to traditional thiolation for sensing and therapeutic applications.

Keywords:

alkyne chemical sensing gold nanoparticles lateral flow assay surface functionalization

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Area of Science:

Nanomaterials Science
Surface Chemistry
Bioconjugation

Background:

Colloidal gold nanoparticles (AuNPs) are crucial for sensing and therapeutics.
Current thiol (SH) functionalization methods for AuNPs are limited by complex preparation, oxidation sensitivity, and incompatibility with certain chemical groups.
A robust and versatile surface functionalization is needed for diverse applications and stability in biological environments.

Purpose of the Study:

To report a novel surface functionalization method for AuNPs using alkyne derivatives.
To demonstrate the advantages of alkyne functionalization over traditional thiolation and peptide-bond methods.
To explore the application of alkynylated AuNPs in sensitive detection assays.

Main Methods:

Preparation of alkynylated biotin and fluorescein derivatives.
Functionalization of AuNPs with alkyne derivatives.
Characterization of alkynylated AuNPs using lateral flow assay, gel electrophoresis, and spectroscopy.
Assessment of conjugation efficiency, size distribution, and protein interaction properties.

Main Results:

Alkyne functionalization of AuNPs demonstrated straightforward preparation, rapid conjugation in various media, and higher efficiency.
Alkynylated AuNPs exhibited long-term stability and resistance to decomposition under harsh conditions.
The Au-alkyne bond properties were investigated, showing suitability for protein interactions.

Conclusions:

Alkyne-based surface functionalization is a superior alternative to thiolation for gold nanoparticles.
Alkynylated AuNPs offer enhanced stability, efficiency, and versatility for biosensing and therapeutic applications.
This method enables sensitive detection of analytes like hydrogen peroxide and streptavidin proteins.