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Modification and Application of Gold Nanorods in Surface Enhanced Raman Scattering Based Assays Open Access

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Other title
Subject/Keyword
Gold nanorods, surface enhancement Raman spectroscopy, Bioassay, thyroxine, Goat IgG
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Elbayomy,Shereen A
Supervisor and department
McDermott, Mark (Chemistry)
Examining committee member and department
Campbell, Robert (Chemistry)
Masson, Jean-Francois (Chemistry)
Charles, Lucy (Chemistry)
McDermott, Mark (Chemistry)
Loppnow, Glen (Chemistry)
Department
Department of Chemistry
Specialization

Date accepted
2015-03-09T13:42:52Z
Graduation date
2015-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Surface enhanced Raman scattering (SERS) is an ultrasensitive vibrational spectroscopic technique to detect molecules on or near the surface of plasmonic nanoparticles. More recently, this technique has been used to design novel nanoprobes named “SERS labels” that combine metallic nanoparticles and specific organic Raman reporter molecules. Such SERS labels can be conjugated to capture probes of biological molecules to be used to indirectly sense the target biological molecules by using laser Raman spectroscopy. Various metal nanoparticles act as a Raman signal amplifier for engineering of nanoprobes. In general, their size, geometry, chemical composition, and surface chemistry can influence the Raman enhancement ability. Recently, interest in gold nanorods (GNRs) has increased, as they possess unique optical and electronic properties. Many of the targeted applications for GNRs require their surface modification, but it can often be a challenge due to their cetyltrimethylammonium bromide (CTAB) coating, which is a stabilizing agent used during GNR synthesis. The work presented in Chapter 2 of this thesis explored spectroscopic and electronic microscopy characterization of GNRs after CTAB replacement with a mixed thiolate layer of a Raman reporter such as 4-nitrobenzenethiol (tNB) and 2-(2-{2-[2-(2-[2-(11-mercapto-undecyloxy)-ethoxy]-ethoxy)–ethoxy]-ethoxy}–ethoxy)-ethoxy–acetic acid (HSC11(EO)6~COOH). This HSC11(EO)6~COOH linker provides; steric stability through hydrophobic alkyl chain; water solubility due to presence of an ethoxy moiety that improves ligand exchange in aqueous solution; and anchor points such as carboxylic acid or amino groups for further conjugation with biological molecules. Chapter 3 presents the SERS response of the −SC11(EO)6~COO-/tNB modified GNRs of four different aspect ratios and 30 nm diameter spherical gold nanoparticles, the characteristic Raman spectrum of 4-nitrobenzenethiol was measured for five gold nanoparticle solutions. The capability of using the −SC11(EO)6~COO-/tNB modified GNRs of aspect ratio 2.4, which were covalently linked to immunoglobulin G (IgG) through terminal-carboxylic acid group of thiolate linker were explored with a chip-based SERS immunoassay in Chapter 4. The sensitivity of SERS based sandwich immunoassay utilizing gold nanorods of aspect ratio 2.4 for goat IgG detection was translated to a limit of detection (LOD) of 15 fM. The detection and quantification of small metabolite molecules is being targeted as a promising diagnostic method in disease assessment. Chapter 5 in this thesis presents an indirect competitive SERS based assay for the analysis of the thyroid hormone thyroxine in its free form (fT4). In this assay, we used fT4 conjugated SERS labels of GNRs to compete with fT4 standard solutions for monoclonal antibody binding sites. Lower levelss of free thyroxine than threshold, that accompanies hypothyroidism disease, can be detected and the results were correlated well with the results from a commercial enzyme-linked immunosorbent assay (ELISA) kit.
Language
English
DOI
doi:10.7939/R37M0478W
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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