附加诱导变量在并联质谱学中的变量
Botao Liu1, Zhifeng Tang2,3, Tao Huan1
1Department of Chemistry, Faculty of Science, University of British Columbia, Vancouver Campus, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.
Analytical chemistry
|July 30, 2025
概括
前体离子类型在代谢学中显著影响着双重质谱 (MS/MS) 光谱. 考虑到这些变化对于准确的化合物识别和分析至关重要.
科学领域:
- 分析化学 分析化学
- 代谢学 代谢学 代谢学
- 质谱测量质量谱测量
背景情况:
- 双重质谱 (MS/MS) 对于在代谢学中的结构阐明和化合物注释至关重要.
- 关于前体离子类型如何影响MS/MS光谱变异性的系统研究有限.
- 了解这种变异性是提高代谢数据分析准确性的关键.
研究的目的:
- 系统地研究不同前体离子类型对MS/MS光谱生成和可变性的影响.
- 评估前体离子类型对各种碰撞能量的光谱相似性的影响.
- 强调在代谢学化合物注释中需要前体离子类型意识的策略.
主要方法:
- 来自NIST 20光谱库的50多万个MS/MS光谱的分析,包括24,686种独特的化合物.
- 从各种前体离子类型 ([M+H]+,[M-H]-,添加等) 生成的光谱的比较. 与参考光谱相比.
- 评估一系列碰撞能量 (CE) 的光谱相似性.
主要成果:
- 酸盐添加离子 ([M+Na]+,[M+K]+) 由于电荷载体差异,显示出明显的碎片化和低光谱相似性.
- 其他离子类型 ([M+NH4]+, [2M+H]+,等等) 具有中等到高的相似性,往往分裂为参考离子.
- 碎片化在低CE时是结构驱动的,在高CE时是能量驱动的,增加相似性,除了 [2M+H]+/[2M-H]-在高CE时.
结论:
- 前体离子类型显著影响MS/MS光谱数据,影响化合物注释.
- 忽视前体离子类型可能会导致光谱库搜索,分子网络和机器学习模型中的错误.
- 预体离子类型意识的方法对于在代谢学中强大而准确的代谢物识别至关重要.
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