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The unusual fragmentation of long-chain feruloyl esters under negative ion electrospray conditions

机译:负离子电喷雾条件下的长链二氧酰酯的不寻常片段化

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摘要

Long-chain ferulic acid esters, such as eicosyl ferulate (1), show a complex and analytically valuable fragmentation behavior under negative ion electrospay collision-induced dissociation ((-)-ESI-CID) mass spectrometry, as studied by use of a high-resolution (Orbitrap) mass spectrometer. In a strong contrast to the very simple fragmentation of the [M + H](+) ion, which is discussed briefly, the deprotonated molecule, [M - H](-), exhibits a rich secondary fragmentation chemistry. It first loses a methyl radical (MS2) and the ortho-quinoid [M - H - Me](-center dot) radical anion thus formed then dissociates by loss of an extended series of neutral radicals, CnH2n + 1 center dot (n = 0-16) from the long alkyl chain, in competition with the expulsion of CO and CO2 (MS3). The further fragmentation (MS4) of the [M - H - Me - C3H7](-) ion, discussed as an example, and the highly specific losses of alkyl radicals from the [M - H - Me - CO](-center dot) and [M - H - Me - CO2](-center dot) ions provide some mechanistic and structural insights.
机译:长链阿魏酸酯,例如eicosyl erulate(1),显示在负离子电雨碰撞碰撞诱导的解离(( - ) - eSI-cid)质谱法下的复合物和分析有价值的碎片行为,如通过使用高的研究 - 效果(orbitrap)质谱仪。在简单地讨论的[M + H](+)离子的基础上的强烈对比,将去质子化分子[M - H]( - ),表现出丰富的二次碎裂化学。它首先失去甲基自由基(MS2)和由此形成的邻喹啉( - 中心点)自由基阴离子,然后通过丢失延伸系列中性自由基,CNH2N + 1中心点(n = 0-16)从长烷基链,在与CO和CO2的驱逐竞争中(MS3)。 [M - H-ME - C3H7]( - )离子的其他碎片(MS4),作为示例,以及[M - H-ME-CO]( - 中心点)的烷基的高度特异性损失)和[M - H - ME - CO2]( - 中心点)离子提供了一些机械和结构见解。

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