直接从组织中使用电子诱导解离的和离子化酸丁胆区域体的结构解和相对量化
Tingting Yan1, Matthias-Erich N Born1, Boone M Prentice1
1Department of Chemistry, University of Florida, Gainesville, FL 32611.
概括
电子诱导解离 (EID) 在MALDI成像质谱学中使用和添加物有效地表征酸胆 (PCs). 这种方法可以直接从生物组织中获得详细的脂质结构,包括区域异构体和双键位置.
科学领域:
- 利皮多米克 (Lipidomics) 是一种消化剂.
- 质谱测量质量谱测量
- 结构生物学 结构生物学
背景情况:
- 类胆 (PCs) 是重要的脂质,需要全面的结构分析来理解生物作用.
- 质子PC的电子诱导解离 (EID) 提供了详细的结构见解,包括头组,脂肪基区域化学和双键位置.
- 金属化PCs ([M + Na]+和[M + K]+) 在MALDI成像质谱学中很常见,但它们从组织中获得的EID行为没有被描述.
研究的目的:
- 研究EID对于直接从生物组织中生成的和离子化酸丁胆离子的结构特征的实用性.
- 建立一个MALDI成像质谱工作流程,利用EID进行深入的脂质分析.
主要方法:
- 在MALDI成像质谱学框架内利用电子诱导解离 (EID) 在 ([M + Na]+) 和 ([M + K]+) 化酸丁胆离子上.
- 分析碎片化模式以获取结构信息,包括脂质头组,脂肪酸链位置和双键位置.
主要成果:
- 化PC的EID提供了近乎完整的结构信息,包括头组碎片化和脂肪尾细节.
- EID促进了sn特定的糖骨干裂变和sn-2脂肪酸的优先损失,使PC区域异构体的容易分化和量化成为可能.
- 在大鼠大脑组织中,对sn位置异构体的相对量化显示了和化异构体百分比的显著区域差异.
结论:
- 和酸化PC的EID是MALDI成像质谱学中全面的脂质结构特征的强大工具.
- 这种方法可以直接从生物样本中对脂质头组,脂肪酸区域化学和双键位置进行详细分析.
- 该方法可以准确区分和PC区域异构体的相对量化,揭示特定组织的分布模式.
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