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DEVELOPMENT OF FAB/MS-MS FOR ENVIRONMENTAL HEALTH SCIENCES

DEVELOPMENT OF FAB/MS-MS FOR ENVIRONMENTAL HEALTH SCIENCES
环境健康科学 FAB/MS-MS 的开发
批准号:
3941541
负责人:
K B TOMER
金额:
$0.0万
依托单位国家:
美国
项目类别:
财政年份:
--
资助国家:
美国
项目状态:
未结题
起止时间:

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中文摘要
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英文摘要
Fast atom bombardment (FAB) has become one of the most widely utilized techniques for obtaining mass spectra of thermally labile and/or very polar substances. In conjunction with tandem MS (MS-MS), the fragmentation information so vital for structure elucidation can be obtained from ions normally not observed to fragment and from mixtures where the parent ion-daughter ion relationships are not known. This project involves three areas: 1) instrumental developments in MS-MS; 2) determination of underlying structural features which influence the spectra obtained so that data from unknowns can more easily be used for structure elucidation; and 3) application of FAB/MS and FAB/MS-MS for structure elucidation. As part of the instrumental development we have extended our present instrument capabilities from MS-MS to MS-MS-MS-MS (MS4). With MS4, the consecutive fragmentations of a molecule can be followed. In the determination of structural effects on MS-MS data, we have investigated the effects various N- and C-terminal amino acids have on the data and the utility of MS-MS spectra of (M+Na)+ ions of peptides for sequencing peptides. We have applied FAB/MS and FAB/MS-MS to the structure elucidation of chemically modified analogs of Leu-enkephalin in which a CH2S moiety replaces as amide linkage, to the structure elucidation of phospholipids containing unusual fatty acids and head groups, to the differentiation of steroid glucuronide stereoisomers by MS-MS, and to the characterization of cross- linked peptides.
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