Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 174 for “"size-exclusion chromatography"”.
-
Indirect conductivity detection in size exclusion chromatography of small molecules
Size Exclusion Chromatography (SEC) is a liquid chromarographic technique used for the characterization of polymers and polymer related materials and also for the separation of small molecules. The major drawback of SEC is the lack of availability of a universal and true mass detector for providing …
-
The evaluation of crosslinked poly-4-vinylpyridine as a packing material for size exclusion chromatography
… (XPVP) has not previously been used as a size exclusion chromatographic packing material. This material appears attractive for the analysis of nitrogen containing polymers because of its basic nitrogen functionality, and desirable physical properties. Its use as such is investigated with …
-
Study of the dilute solution properties of various homo- and block co-polymers by variable temperature size exclusion chromatography
The Variable Temperature Size Exclusion Chromatography (VTSEC) was used to study the dilute solution properties of various homo- and block copolymers as well as polymer blends, focus being primarily on the configuration-dependent properties such as average chain dimensions and hydrodynamic behavior …
-
Size Exclusion Chromatography of Poly(2-ethyl-2-oxazoline) Homopolymers and Poly(ethylene oxide)-b-Poly(2-ethyl-2-oxazoline) Copolymers
Size exclusion chromatography is the method of choice for characterizing molecular weights and molecular weight distributions of polymers. An important advancement in SEC is multidetection SEC which includes multi-angle laser light scattering, viscometry, refractive index and UV spectroscopy to …
-
Synthesis, Characterization and Electrochemical Properties of Gold Nanomolecules
… out this dissertation are discussed in detail. Size dependent properties of the gold nanomolecules are described. The structure of gold nanomolecules is explained based on the crystal structure of Au25(SCH2CH2Ph)18. The theoretical basis for the stability of the gold nanomolecules is explained …
-
Chromatography of Latex Particles in Packed Columns (Hydrodynamic, Dispersion)
… particles has been the adaptation of liquid chromatography techniques to the determination of particle size distributions of polymer latexes. In this work, techniques that involve packed columns with either nonporous packing material (termed hydrodynamic chromatography) or porous packing …
-
Living cationic polymerization
… were conducted for these experiments using size exclusion chromatography. These studies indicated that transfer/termination reactions were present. The observed kinetics may be explained by a polymerization mechanism involving a single propagating species which is present in low …
-
Ring-opening metathesis polymerization of 3-substituted cyclooctenes initiated by group 6 alkylidene complexes
… were isolated, characterized by ¹H and ¹³C NMR, size-exclusion chromatography, and differential scanning calorimetry, and hydrogenated to generate the corresponding saturated polymer.
-
Identification and quantification of natural organic matter in the Windhoek operating company water treatment plant in Windhoek, Namibia
… fractions was determined using high pressure size exclusion chromatography (HPSEC) with fluorescence and UV detection methods. Raw water (ponds) had high dissolved organic matter, however this was greatly reduced after the dissolved air flotation, biological and granular activated carbon …
-
Proteomic Identification of Hemp (Cannabis sativa) Seeds by Tandem Mass Spectrometry and Evaluation of Cytotoxic Activity
… techniques, including top-down proteomics, size exclusion chromatography, affinity chromatography, high-resolution ESI QTOF LC/MS/MS, and De Novo protein sequencing bioinformatics tools. The process involved defatting cannabis sativa seeds in hexane and extracting protein in PBS buffer over …
-
Identifying iron-binding antioxidants in New Zealand honeydew honey
… could not be isolated from the XAD-2 resin, size exclusion chromatography was used to separate the honey components based on their molecular sizes. The technique was successsful in separating antioxidants from free sugars in honey. However, size exclusion chromatography did not give any …
-
Investigations into the digestive system proteases of Argiope aurantia (Araneae: Araneidae), hemolytic agents of spider venoms, and the role of both in necrotic arachnidism
… A2.</p><p>Through a combination of ion exchange chromatography, size exclusion chromatography, ultracentrifugation, and electrophoresis, an attempt was made to isolate several digestive fluid proteases, and seine protease inhibitors in milligram quantities from the digestive fluid of Argiope …
-
Engineering approaches to control polymer architecture
… Chapter 6 will cover the challenges of size exclusion chromatography for the analysis of bottlebrush polymers. This chapter is a culmination of critical data analysis and practical information to help improve the rigor of polymer characterization by size exclusion chromatography to …
-
Part I: Crystal Engineering Using Trimesic Acid Analogs. Part II: An Extremely Stable Hydrogen-Bonded Hexamer
… and 10% (v/v) DMSO/chloroform. The results of size exclusion chromatography (SEC) with polystyrene standards, as well as comparisons with covalent dendritic control compounds 11 and 23, suggest that the aggregate is a hexamer.
-
The establishment of the oligomeric purity and molecular structure for n-methylated bis(8-hydroxyquinoline) zinc (n = 0, 2, 4, and 5)
… on the device properties. By utilization of size exclusion chromatography it has been determined that the dominant species of nMeq2Zn (n = 0, 4, 5) is tetrameric in crystalline form dissolved in chloroform, in thermally vapor deposited films, and in crystalline form dissolved in chloroform …
-
Interaction Between Two E3 ligases, NEDD8ylated Cullin and HHARI
… and stabilize complex formation. Analytical size-exclusion chromatography, autoubiquitination, and electron microscopy reveal consistent behavior for this triple-mutant. Future structure-based studies will help elucidate the mechanism of the unsolved mystery of RBR activation and its …
-
Chemical and Chromatographic Studies on Dimeric Fatty Acids (Heated Fats)
… the diketo dimer of methyl stearate were synthesized, purified and chemically characterized by the use of mass spectrometry, spectroscopy and chemical analysis. Effective chromatographic systems including gel permeation chromatography, high performance size exclusion chromatography, gas liquid …
-
Characterization of Slr1098, a Protein with Similarity to the Bilin Lyase Subunit CpcE from the Cyanobacterium Synechocystis sp. PCC 6803
… to phycocyanin. This protein is hypothesized to be involved in oligomerization of phycocyanin due to previous results showing the mutant made shorter phycocyanin rods. The recombinant Slr1098 protein was produced and purified from E. coli cells. Binding assays showed interaction between …
-
Urinary Excretion of (1-3)-Beta-D-Glucans.
… and analyzed by fluorescence spectroscopy, size-exclusion chromatography and GPC/MALLS. 71 ± 3% of fluorescence remained in the >5K MWCO fraction; this fraction showed a minor peak with a molecular mass (171 ± 11K) corresponding to injected glucan (~150K). Most excreted glucans were of lower …
-
Synthesis and <sup>1</sup>H-NMR characterization of amphiphilic acrylate block copolymers to investigate the effect of chain rigidity on micelle formation in solution
… to aggregate is also influenced by polymer size. Acrylate and methacrylate monomers were chosen for their similar chemical properties but their difference in reported glass transition temperature (<em>T<sub>g</sub>) </em><sup>1</sup>H-NMR methods were developed to measure molecular weight of …
Page 1 of 9