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Method development, novel applications and fundamental studies of ambient ionization methods: Desorption electrospray ionization (DESI) and low temperature plasma (LTP) ionization.

机译:环境电离方法的方法开发,新颖应用和基础研究:解吸电喷雾电离(DESI)和低温等离子体(LTP)电离。

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摘要

Ambient ionization is a novel field in mass spectrometry. Ambient ionization methods are promising as they permit direct analysis of samples in their native environment with minimal sample preparation. The first part of my dissertation research focused on the application of two particular ambient ionization methods to various chemical systems. These experiments have included systematic and proof-of-concept analyses in the areas of biology (analysis of drugs of abuse in high salt matrix), microbiology (analysis of targeted analytes in bacterial matrix and development of high-throughput screen targeting biosynthesized analytes), and agriculture (direct analysis of leaves) using the methods of desorption electrospray ionization (DESI) and supplemented by extractive electrospray ionization (EESI) in select studies. DESI and the low temperature plasma (LTP) probe, a recently developed plasma ambient ionization source, were both explored in the direct analysis and derivation of olefin molecules. Fundamental studies to investigate the LTP probe were performed for the new source. Elaboration of the LTP ionization mechanism was derived from fundamental optical emission studies investigating various emission profiles of the low temperature plasma. LTP was also used to evaluate matrix effects and forensic applications in the analysis of drugs of abuse from biological matrices. In summary, my dissertation work has focused on method development and applications as well as fundamental studies which illustrate the robust capabilities of ambient ionization mass spectrometry methods.
机译:环境电离是质谱领域的一个新领域。环境电离方法是有前途的,因为它们允许以最少的样品制备直接在其自然环境中分析样品。我的论文研究的第一部分集中在两种特定的环境电离方法在各种化学系统中的应用。这些实验包括生物学(高盐基质中滥用药物的分析),微生物学(细菌基质中目标分析物的分析以及针对生物合成分析物的高通量筛选的开发)领域的系统性和概念验证分析,和农业(叶片的直接分析)使用解吸电喷雾电离(DESI)的方法,并在选择研究中辅以萃取电喷雾电离(EESI)。在直接分析和推导烯烃分子中,都探索了DESI和低温等离子体(LTP)探针(一种最近开发的等离子体环境电离源)。对新来源进行了基础研究以调查LTP探针。对LTP电离机理的阐述源自基础光学发射研究,该研究研究了低温等离子体的各种发射曲线。 LTP还用于评估基质效应和法医应用,以分析来自生物基质的滥用药物。总之,我的论文工作集中在方法开发和应用以及基础研究上,这些研究说明了环境电离质谱方法的强大功能。

著录项

  • 作者

    Jackson, Ayanna U.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Chemistry Analytical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 268 p.
  • 总页数 268
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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