Gold nanoparticles (AuNPs) have unique optical and chemical properties. Dynamic light scattering (DLS) is an analytical tool used routinely for nanoparticle size measurement. The combined use of AuNPs and DLS has led to a novel analytical assay technology called D2Dx (from diameter to diagnostics). Herein, my dissertation highlights the extended use of D2Dx for biomolecule detection and analysis. Under this general theme, Chapter 1 provides some background information of AuNPs, DLS, the principle of D2Dx technique and its potential applications. Chapter 2 summarizes a study on the effect of AuNP concentrations and laser power on the hydrodynamic size measurement of AuNPs by DLS. This study demonstrated the multiple scattering effect on DLS analysis, and how to use the exceptionally high sensitivity of DLS in AuNP aggregate detection for bioassay design and development. Chapter 3 explores a cooperative interaction between AuNP and certain proteins in blood serum that are key to the immune system, leading to a novel diagnostic tool that can conveniently monitor the humoral immunity development from neonates to adults and detect active infections in animals. Chapter 4 reports an application of D2Dx technique for acute viral infection detection based on the active immune responses elicited from mouse models infected with influenza virus. Chapter 5 describes another application of D2Dx for prostate cancer detection. The D2Dx assay identifies prostate cancer patients from non-cancer controls with improved specificity and sensitivity than PSA test. Chapter 6 demonstrates the use of AuNPs and DLS for hydrodynamic size measurement of protein disulfide isomerase with two different conformations. Chapter 7 investigates the concentration-dependent self-assembling behavior of ribostamycin through its interaction with AuNPs in aqueous solution. Overall, this dissertation established several lines of applications of using AuNPs and DLS for biomolecular research and in vitro diagnostics.
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Doctor of Philosophy (Ph.D.)
College of Sciences
Length of Campus-only Access
Doctoral Dissertation (Open Access)
Zheng, Tianyu, "Light Scattering Property of Gold Nanoparticles with Applications to Biomolecule Detection and Analysis" (2018). Electronic Theses and Dissertations. 6230.