在MALDI质谱成像过程中监测源内脂碎片化的程度
Samantha L Cousineau1, Mohammed H Sarikahya2, Kristina Jurcic3
1Department of Chemistry, Canada.
Analytica chimica acta
|July 3, 2025
概括
这项研究引入了脂标准,用于监测和减轻矩阵辅助激光脱/电离质谱成像 (MALDI-MSI) 中的源片断. 这提高了脂肪酸 (FA) 信号检测在组织脂质分析中的可靠性.
科学领域:
- 分析化学 分析化学
- 生物化学 生物化学
- 质谱测量质量谱测量
背景情况:
- 矩阵辅助激光脱/电离质谱成像 (MALDI-MSI) 对于组织脂质分析至关重要.
- 在源中的脂质碎片化可能会损害MALDI-MSI中脂肪酸 (FA) 信号的准确性.
- 调查和减轻这种碎片化对于可靠的脂质分析至关重要.
研究的目的:
- 为了评估在MALDI-MSI中源脂碎片化的程度.
- 评估脂标准对监测碎片化的有用性.
- 在MALDI-MSI实验中开发一个工作流程,以尽量减少源中碎片化.
主要方法:
- 使用的脂标准 (PE,PG,PS,PC) 具有不同的脂肪酸尾巴.
- 在负离子模式下使用四个MALDI矩阵 (NRM,9AA,DAN,DPH) 评估碎片化.
- 进行比较的标准沉积技术 (手动喷涂,自动喷涂,预沉积,直接应用).
主要成果:
- 脂标准有效地检测到源中碎片化,由外源FA 17:0尾部信号证明.
- 不同的矩阵表现出不同程度的碎片化.
- 与感兴趣的脂质相匹配的标准选择是优化激光能量和最大限度地减少碎片化的关键.
结论:
- 外源脂标准可以在MALDI-MSI期间可靠地监测源内碎片化.
- 优化标准沉积和矩阵选择对于准确的脂质分析至关重要.
- 这项研究提供了一个实用的工作流程,以提高使用MALDI-MSI复杂生物样本中的脂质量定量的可靠性.
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