Toward total structural analysis of cardiolipins: multiple-stage linear ion-trap mass spectrometry on the [M - 2H + 3Li]+ ions.

Toward total structural analysis of cardiolipins: multiple-stage linear ion-trap mass spectrometry on the [M - 2H + 3Li]+ ions.
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DOI:
10.1016/j.jasms.2010.07.003
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发表时间:
2010-11
影响因子:
3.2
通讯作者:
Turk J
Turk J
中科院分区:
化学3区
文献类型:
--
作者:
Hsu FF;Turk J

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本文描述了ESI多级线性离子阱(LIT)质谱法用于心脏磷脂(CLs)近乎完整的结构表征,包括脂肪酸取代基的鉴定,甘油主链上脂肪酸取代基的分配,以及脂肪酸链上双键或环丙基的位置。离子陷阱(MS2)中CL的[M−2H + 3Li]+离子发生碰撞激活解离(CAD)后,观察到两组片段离子(指定为(a + 136)和(b + 136)离子),类似于先前报道的[M−2H + 3Na]+离子,导致磷脂酰部分附着在中心甘油的1'-或3'-位置。进一步解离(a + 136)(或(b + 136))离子(MS3)产生(a + 136−R1(或2)CO2Li)(或b + 136−R1(或2)CO2Li)离子对,识别脂肪酸部分及其在甘油主链上的位置。然后在(a + 136−R1(或2)CO2Li)(或b + 136−R1(或2)CO2Li)离子上进行MS4,以消除三羧基甘油磷酸酯残留物(136 Da),生成(a−R1(或2)CO2Li)离子,然后进行MS5。MS5光谱包含脂肪酸取代基的双键或环丙基的结构信息。最后,由MS5产生的二稀脂肪酸离子上的后续MS6也产生确认分配的特征离子。
ESI multiple-stage linear ion-trap (LIT) mass spectrometric approaches for a near-complete structural characterization of cardiolipins (CLs), including identification of the fatty acyl substituents, assignment of the fatty acid substituents on the glycerol backbone, and location of the double bond(s) or cyclopropyl group along the fatty acid chain are described. Upon collisionally activated dissociation (CAD) on the [M − 2H + 3Li]+ ions of CL in an ion-trap (MS2), two sets of fragment ions (designated as (a + 136) and (b + 136) ions) analogous to those previously reported for the [M − 2H + 3Na]+ ions were observed, leading to assignment of the phosphatidyl moieties attached to 1'- or 3'-position of the central glycerol. Further dissociation of the (a + 136) (or (b + 136)) ions (MS3) gives rise to the (a + 136 − R1(or 2)CO2Li) (or b + 136 − R1(or 2)CO2Li) ion pairs that identify the fatty acid moieties and their position on the glycerol backbone. This is followed by MS4 on the (a + 136 − R1(or 2)CO2Li) (or b + 136 − R1(or 2)CO2Li) ion to eliminate a tricylic glycerophosphate ester residue (136 Da) to yield the (a − R1(or 2)CO2Li) ion, which is then subjected to MS5. The MS5 spectrum contains the structural information that locates the double bond(s) or cyclopropyl group of the fatty acid substituents. Finally, the subsequent MS6 on the dilithiated fatty acid ions generated from MS5 also yields feature ions that confirm the assignment.
DOI: 10.1016/0003-2697(91)90332-n
发表时间: 1991-06-01
影响因子: 2.9
作者:
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通讯作者: OTTEN, D
通过多阶段线性离子陷阱质谱法用电喷雾电离阐明长链不饱和脂肪酸的双键位置。
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发表时间: 2008-11
影响因子: 3.2
作者:
Hsu FF;Turk J
通讯作者: Turk J
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期刊: BIOCHEMISTRY
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