Surface Functionalization of Gold Nanorods Improves Nanostructure Assemblies on Amyloid Fibril Scaffolds

Abstract

A hybrid scaffold containing gold nanorods and lysozyme amyloid fibrils has been fabricated, and the effect of surface modification on improving nanostructure assembly on the biological template has been investigated. The nanohybrid system was characterized by monitoring surface plasmon resonance bands, dynamic light scattering spectroscopy, Thioflavin-T assay, and transmission electron microscopy. Surface of gold nanorods (GNRs) was modified with polystyrene sulfonate (PSS), and possible difference in assembly of the pristine and modified nanostructures was compared upon interaction with amyloid fibrils. Analysis of transmission electron microscopy showed that changing the surface charge of GNRs with biocompatible polymer improved electrostatic interactions between the nanostructures and amyloid fibril templates. Analysis of cell viability assays also showed that surface functionalization of GNRs remarkably improved biocompatibility of the nanoscaffold. Results of this study encourage utilization of modification strategies to fabricate a new generation of nanoscaffolds with fruitful applications in regenerative medicine.