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首页> 外文期刊>Journal of mass spectrometry: JMS >The McLafferty rearrangement in the Glu residue in a cyclic lipopeptide determined by Q-TOF MS/MS
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The McLafferty rearrangement in the Glu residue in a cyclic lipopeptide determined by Q-TOF MS/MS

机译：通过Q-TOF MS / MS测定的环状脂肽中Glu残基的McLafferty重排

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摘要

The intraresidue rearrangement and loss of the side chain of the Glut residue was found through MS/MS analysis of both original and methanol-esterified lipopeptides. Both Glu and Asp residues in the cyclic lipopeptide were esterified. The MS/MS results showed that the loss of fragment 72 or 86 was induced by McLafferty-type rearrangement from the Glu or esterified Glu. The mechanism of loss of the Glu residue can be used to determine or to corroborate the existence of the Glu and to help understand the fragment formation in MS/MS. The cleavage mechanism and m/z intensities imply that the sodium ion was easier attached and the cleavage would easily occur at specific sites.
机译：通过对原始和甲醇酯化脂肽的MS / MS分析，发现了Glut残基的残基内部重排和丢失。环状脂肽中的Glu和Asp残基均被酯化。 MS / MS结果显示片段72或86的丢失是由Glu或酯化Glu的McLafferty型重排引起的。 Glu残基丢失的机制可用于确定或证实Glu的存在，并有助于理解MS / MS中的片段形成。裂解机理和m / z强度暗示钠离子更容易附着，并且裂解将容易在特定部位发生。

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