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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
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了解MS/MS扫描的范围设置:用完整的葡萄糖进行案例研究.

Tim S Veth1, Kathryn Kothlow1, Nicholas M Riley1

  • 1Department Chemistry, University of Washington, Seattle, Washington 98195, United States.

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概括

在串联质谱法 (MS/MS) 中打破"5-10-15规则"可以通过扩大扫描范围来改善糖的识别. 这可以更好地检测低质量和高质量电荷比离子,这对于糖分析至关重要.

关键词:
碎片化 碎片化 碎片化葡萄糖类是葡萄糖类中的一种.质量范围范围的质量范围.质谱测量质谱测量质谱测量质谱测量质量测量质谱测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量质量测量双联质谱质量测量技术

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科学领域:

  • 分析化学 分析化学
  • 生物化学 生化学
  • 质谱测量质量谱测量

背景情况:

  • 使用双重质谱法 (MS/MS) 进行有效的糖标识需要分析低质量到电荷 (m/z) 的氧离子和高m/z的片段.
  • 传统的MS/MS扫描范围设置,通常以"5-10-15规则"为指导,可能会限制这些关键离子的检测.
  • 糖蛋白组学受益于MS/MS扫描范围比通常用于非修饰的更广泛.

研究的目的:

  • 调查偏离"5-10-15规则"对MS/MS扫描范围对糖特征的影响.
  • 为了确定是否违反"5-10-15规则"会影响离子传输效率在较低和较高的m/z极端.
  • 为优化MS/MS扫描参数提供洞察力,以进行增强的糖分析.

主要方法:

  • 使用了一种四极-轨道-线性离子陷Tribrid MS系统 (轨道上升).
  • 使用高能碰撞解离 (HCD),电子转移解离 (ETD) 和电子转移/高能碰撞解离 (EThcD) 进行MS/MS扫描.
  • 通过遵守和打破扫描范围设置的"5-10-15规则"获得的糖特性结果进行比较,特别是当第一个m/z值在120左右时.

主要成果:

  • 打破第一个m/z值约为120的"5-10-15规则"并没有显著减少在低或高m/z端的碎片离子传输.
  • 通过不严格遵守"5-10-15规则"来实现更广泛的扫描范围,可以改善糖特异性离子的覆盖范围.
  • 该研究表明了扫描范围设置对糖分析的实际含义.

结论:

  • 在特定的MS/MS场景中,可以务实地忽略"5-10-15规则",例如糖分析,以实现更广泛的扫描范围.
  • 通过打破 "5-10-15 规则"来优化MS/MS扫描范围,可以提高糖的识别和表征.
  • 这种方法提供了一种实际的策略,可以提高糖蛋白质组数据的质量和深度.