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通过气相离子/离子反应化学,聚离子中选择性共价键的形成
Hongling Han1, Scott A McLuckey
1Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084, USA.
Journal of the American Chemical Society
|August 26, 2009
概括
本研究展示了如何使用双功能试剂在气相中化学修改多离子. 这种选择性修改技术对于多阶段质谱分析非常有用.
科学领域:
- 分析化学 分析化学
- 质谱测量质量谱测量
- 化学生物学 化学生物学
背景情况:
- 聚上的主要氨基是修改的关键位置.
- 气相离子/离子反应为选择性化学转换提供了独特的机会.
- 多阶段质谱法 (MS/MS) 是分析和蛋白质的强大工具.
研究的目的:
- 为了证明在气相中的多离子上初级氨基的选择性共价变异.
- 在质谱实验中,利用双功能试剂离子进行针对性的化学反应.
- 建立一种方法,在随后的碰撞激活步骤中保留共价变化.
主要方法:
- 气相离子/离子反应发生在质子聚离子和双功能试剂离子之间.
- 使用具有强电荷位点 (例如硫酸) 的试剂离子形成长寿命添加物.
- 一个独特的功能组 (aldehyde) 与聚原氨基在试剂上的后续反应,形成一个 imine (Schiff 基).
- 碰撞激活以诱导水损失,并确认 imine 形成和修改稳定性.
主要成果:
- 在多离子和双功能试剂离子之间成功形成了长寿命的添加物.
- 通过化基与原始氨基的反应,证明了选择性胺基 (Schiff基) 的形成.
- 证实,在随后的碰撞激活下,共价变化是稳定的.
- 在多阶段质谱学框架内展示了这种方法的实用性.
结论:
- 使用双功能试剂离子,可以实现聚原胺的选择性气相共价修饰.
- 这种方法可以在质谱仪设置中对酸进行有针对性的化学标记.
- 开发的技术增强了多阶段质谱学的功能,用于详细的聚分析.
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