[PDF] Chemical Approaches To The Stabilization Of Non Covalent Complexes In Matrix Assisted Laser Desorption Ionization Mass Spectrometry eBook

Author : Jinlian Hu
Publisher : Elsevier
Page : 366 pages
File Size : 16,3 MB
Release : 2013-04-16
Category : Technology & Engineering
ISBN : 0857098543

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Shape memory materials are immensely useful because of their capability to recover their original shapes upon exposure to an external stimulus such as heat, moisture, light or a magnetic field. This book reviews key recent research in shape memory polymers, their properties and applications. Topics include the relationship between morphological structures and shape memory properties; high performance Tg and Tm type shape memory polymers; structures of shape memory polymers with supramolecular switches; and the thermally-active and moisture-active shape memory effect of supermolecular shape memory polymers. Advances in shape memory polymers is an essential reference for polymer and textile material students, scientists, designers, engineers and manufacturers. It is also an invaluable guide for professionals in the biomedical, electronics and engineering industries. Reviews key recent research in shape-memory polymers, their properties and applications Opening chapters address the relationship between morphological structures and shape memory properties and high performance Tg and Tm type shape memory polymers Chapters cover thermally-active and moisture-active shape memory effect of supermolecular shape memory polymers, among other topics

Author :
Publisher :
Page : pages
File Size : 24,47 MB
Release : 2004
Category :
ISBN :

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Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is an important tool for high throughput analysis in the field of genome mapping, medical diagnostics and protein identification. Though it is the best option for rapid complex mixture analysis, it does suffer from ion suppression effects, which depend on the type of analytes in the mixture and the sample preparation techniques. The goal of this dissertation is to develop surfactant-aided MALDI-MS (SA-MALDI-MS) for the characterization of complex mixtures and to understand the role of the surfactant in such analyses. Critical micellar concentrations (CMC) of sodium dodecylsulfate (SDS), 0.1%-0.3% w/v, were found to be optimal for SA-MALDI-MS of complex mixtures. The presence of micelles was confirmed by surface tension experiments. To determine the role of these micelles, interactions between SDS and peptides of varying hydrophobicities were studied by fluorescence. Further, SA-MALDI-MS was used in peptide mass fingerprinting, modification mapping and serum profiling experiments to demonstrate the versatility of this technique. Peptide mapping experiments were performed on model proteins using MALDI and SA-MALDI MS. From these experiments it was found that on addition of SDS prior to MALDI analysis there was an increase in the number of tryptic peptides detected thereby improving the total sequence coverage of the analysis. It was found that interactions between peptides and SDS micelles depended on peptide hydrophobicity, sequence, size and charge. In an approach to determine the sites of interactions between MSP and other oxygen-evolving protein complex, chemical protection assays were used to label MSP, and SA-MALDI-MS along with sample fractionation were used to increase sequence coverage from peptide mapping experiments to identify sites of chemical modification. SA-MALDI-MS was also investigated as a sample preparation approach for serum protein profiling. Various clean-up methods were used in conjunction with SDS and other surfactants to study the differences in serum protein profiles. This approach offers the potential for higher throughput sample preparation during protein profiling of biological fluids.

Author : Moon-Ju Kim
Publisher : Springer Nature
Page : 107 pages
File Size : 49,71 MB
Release : 2023-11-11
Category : Science
ISBN : 981996878X

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This book presents innovative laser desorption ionization (LDI)-active nanophotonic structures for addressing the challenges that matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) is currently facing and for enhancing LDI efficiency. It presents a variety of cutting-edge nanophotonic structures to satisfy the mass-analytical needs of sensitivity, reproducibility, and quantification. As opposed to the commercialized, conventional organic matrix used in MALDI-MS, these nanostructures are validated to be highly effective in detecting small metabolites and drugs, highlighting their considerable potential in the mass spectrometry field. It also systematically elucidates fundamental LDI processes in terms of the photo-thermal, electronic, and structural characteristics of nanophotonic structures, offering mechanistic knowledge of LDI-MS. Even though LDI-MS performance is heavily influenced by a number of nanostructure parameters, relatively little is known about the LDI processes associated with those characteristics. An in-depth understanding of nanostructure characteristics and LDI mechanisms thus paves the way for more effective, rational design and development of nanostructures with improved LDI capabilities. Further, with a focus on multiple cascades in nanostructure functions in response to laser pulse stimuli, this book provides detailed, step-by-step procedures to design and construct a nanophotonic, LDI-active platform, which may serve as a roadmap for graduate students in the field of mass spectrometry. Readers, including graduate students, researchers, and experts working in the related areas of mass spectrometry, nanophotonics, and material science and material engineering, will find a wealth of useful information in this book.