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实验和计算评估的脂质体源内碎片化由于定位与矩阵辅助激光消毒/电离的结果

Gregory W Vandergrift¹, William Kew¹, Amity Andersen¹

¹Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States.

Analytical chemistry

|September 19, 2024

概括

与MALDI-1相比,矩阵辅助激光消耗/电离质谱成像-2 (MALDI-2) 增加了源内碎片化 (ISF). 这种后离子化技术提高了灵敏度,但也提高了脂质碎片化,影响了MALDI-MSI中的分子识别.

科学领域:

分析化学分析化学
质谱仪成像成像质谱仪成像
分子光谱学分子光谱学

背景情况:

矩阵辅助激光消耗/电离质谱成像 (MALDI-MSI) 提供空间分辨率的分子数据.
定位 (MALDI-2) 提高了MALDI-MSI的灵敏度和空间分辨率.
马尔迪-2对源内碎片化 (ISF) 的影响需要进一步调查.

研究的目的:

与MALDI-1相比,在MALDI-2中统计评估源内碎片化 (ISF) 的水平.
通过计算建模,研究MALDI-2中ISF的潜在机制.
评估MALDI-2对生物样本峰值检测的影响.

主要方法:

在MALDI-1和MALDI-2条件下进行脂质标准分析.
使用密度函数理论 (DFT) 的气相分子建模.
使用MALDI-MSI与这两种方法对老鼠大脑同质化的分析.

主要成果:

MALDI-2显示了脂质标准的ISF在统计学上显著增加 (65-172%).
计算机建模表明,脂质和键在MALDI-2激光波长下易受碎片化.
MALDI-2检测到老鼠大脑同质体中更多的正离子模式峰值,主要是在低m/z (75-500).

结论:

与MALDI-1相比,MALDI-2中的定位在统计上增加了源中碎片化.
在MALDI-2中增加的ISF可能会影响低m/z离子的准确识别.
虽然提高了灵敏度,但MALDI-2的碎片化增加在数据解释过程中需要仔细考虑.

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