Gold Nanorods Protected with Thiol-end Capped Diblock Copolymer (PHEMA-b-PVEAQ-SH): Synthesis and Applications in Drug Delivery

Document Type: Original Article


Halal Research Center of IRI, FDA, Tehran, Iran



Theranostic nanoparticles with multifunctional ability have been emerging as a new platform for biomedical applications such as imaging, sensing and drug delivery. Despite gold nanorods (GNRs) being an excellent nanosource with multifunctional versatility, they have certain limitations in biomedical applications, which include surfactant toxicity, biological stability and controlled drug release kinetics. Hence, we fabricated thiol-end caped diblock copolymer [poly(2-hydroxyethyl methacrylate)-b-poly[(N-4-vinylbenzyl), N,N-diethylamine)]; [PHEMA-b-PVEA] encapsulated gold nanorods (GNRs) via RAFT polymerization techniques. pH responsive drug release ability of the synthesized biocompatible nanocomposite were also investigated .Also the success of coating was verified by fourier transform infrared (FTIR), zeta potential, transmission electron microscopy (TEM), dynamic light scattering (DLS), proton nuclear magnetic resonance (1H NMR) spectroscopies, gel permeation chromatography (GPC) analysis and UV-Vis spectroscopy. We developed a GNRs@copolymer as narnocarier by using MTX-loading and to enhanced pharmacokinetics. The anti-cancer drug (MTX) was encapsulated into the GNRs@copolymer by the electrostatic force. The MTX-encapsulation efficiency was calculated to be 97% . Release behaviors of MTX from the nanocomposite shown that the rate of MTX release could be controlled by pH value.

Graphical Abstract

Gold Nanorods Protected with Thiol-end Capped Diblock Copolymer (PHEMA-b-PVEAQ-SH): Synthesis and Applications in Drug Delivery


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