Synthesis and Cytotoxicity Studies of Gold Nanoparticle Systems
type: CreativeWork
description: In this work, the immobilisation of different biomolecules on thioalkylated polyethelene glycol (PEG)-capped gold monolayer protected clusters (MPCs) has been successfully conducted. This followed a series of aqueous and nonaqueous synthetic protocols carried out to synthesize gold nanoparticles and MPCs of sizes ranging between 4 – 200 nm. Hetero-bifunctional PEG ligands possessing functionalities such as carboxyl, hydroxyl, biotin and nitrilotriacetic acid (NTA) were introduced resulting in stable, biocompatible gold MPCs, templates for biomolecular functionalisation reactions. Biomolecular functionalisation strategies such as carbodiimide coupling, biotin-avidin interaction and Ni-NTA-histidine interactions following the introduction of the bivalent hexadentate Ni(II) onto the NTA matrix of the MPCs, were conducted to formulate the biomolecular hybrid systems. A range of biomolecules including the cell-penetrating TAT peptide (YGRKKRRQRRR), mitogen-activated protein kinase (MAP kinase), streptavidin and fluorescent-labelled FAM-TAT peptide were successfully immobilised on the gold MPCs. The simplicity of the synthetic approaches and the stability of the resultant biomolecular systems strengthened their potential applications in targeted drug delivery, molecular recognition tools for diagnostics and in the purification, quantification and beneficiation of tagged fusion biomolecules. The colloidal gold nanoparticles, MPCs and bioconjugates were further investigated for inherent biologic effects through a series of end-point based in vitro assays. The cytotoxicity, namely the causation of necrotic cell death was studied using the neutral red assay on CHO22 cell line. All three system types showed benign cytotoxicity properties; demonstrating minor dose-dependence decline in cell viability through necrotic cell death. Additionally, dose-dependent patterns were also observed in the apoptosis-induction effects of these gold systems on CHO22 and CD4 expressing Jurkat ce…
abstract: In this work, the immobilisation of different biomolecules on thioalkylated polyethelene glycol (PEG)-capped gold monolayer protected clusters (MPCs) has been successfully conducted. This followed a series of aqueous and nonaqueous synthetic protocols carried out to synthesize gold nanoparticles and MPCs of sizes ranging between 4 – 200 nm. Hetero-bifunctional PEG ligands possessing functionalities such as carboxyl, hydroxyl, biotin and nitrilotriacetic acid (NTA) were introduced resulting in stable, biocompatible gold MPCs, templates for biomolecular functionalisation reactions. Biomolecular functionalisation strategies such as carbodiimide coupling, biotin-avidin interaction and Ni-NTA-histidine interactions following the introduction of the bivalent hexadentate Ni(II) onto the NTA matrix of the MPCs, were conducted to formulate the biomolecular hybrid systems. A range of biomolecules including the cell-penetrating TAT peptide (YGRKKRRQRRR), mitogen-activated protein kinase (MAP kinase), streptavidin and fluorescent-labelled FAM-TAT peptide were successfully immobilised on the gold MPCs. The simplicity of the synthetic approaches and the stability of the resultant biomolecular systems strengthened their potential applications in targeted drug delivery, molecular recognition tools for diagnostics and in the purification, quantification and beneficiation of tagged fusion biomolecules. The colloidal gold nanoparticles, MPCs and bioconjugates were further investigated for inherent biologic effects through a series of end-point based in vitro assays. The cytotoxicity, namely the causation of necrotic cell death was studied using the neutral red assay on CHO22 cell line. All three system types showed benign cytotoxicity properties; demonstrating minor dose-dependence decline in cell viability through necrotic cell death. Additionally, dose-dependent patterns were also observed in the apoptosis-induction effects of these gold systems on CHO22 and CD4 expressing Jurkat ce…
author: Sosibo, Ndabenhle Mercury Sosibo
keywords: Gold Nanoparticle Systems
license: https://devspace.unizulu.ac.za/bitstreams/9a62fbb9-194e-4355-8e07-f473f52eaf2a/download
date published: 2010
date modified: 2026-07-24T06:17:08Z
provider: University of Zululand
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Zululand