光共振能量转移在气态,质量选择的聚烯酸中
Francis O Talbot1, Anthony Rullo, Huihui Yao
1Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada.
Journal of the American Chemical Society
|October 23, 2010
概括
光共振能量转移 (FRET) 探测电喷离子化 (ESI) 的气相生物聚合物构造. 这种技术揭示了结构如何随着链长和质谱中的电荷状态而变化.
科学领域:
- 分析化学 分析化学
- 生物物理化学 生物物理化学
- 频谱学是一种光谱学.
背景情况:
- 质谱 (MS) 对于分析生物样本至关重要.
- 了解凝聚相特性与电喷离子化 (ESI) 物种之间的关系仍然是一个挑战.
- 在MS中,凝结相和气态之间的结构联系尚未完全理解.
研究的目的:
- 通过使用光共振能量转移 (FRET) 来研究ESI产生的气态生物聚合物的构造.
- 探索FRET效率作为质链长度和电荷状态的函数.
- 建立气相FRET作为探测大型气态离子结构的新方法.
主要方法:
- 气相FRET的罗达胺染料对的表征.
- 使用稳定状态光谱和光寿命测量.
- 在四极离子陷内监测染料标记的聚烯基的能量转移MS.
主要成果:
- 根据链长度和电荷状态,FRET效率有所不同.
- 观察到一个8-proline重复的完全能量转移.
- 对14-proline重复的能量转移减少,电荷状态增加,这表明库伦排斥诱导的延伸.
- 一个曲的配置被推断为一个20-proline重复.
- 光寿命测量表明,被困离子中存在多种构造.
结论:
- 气相FRET是一种可行的技术,用于ESI产生的生物聚合物的结构分析.
- 由于库伦排斥而导致的体脊柱延长会影响气相结构.
- FRET提供了对MS中离子构造异质性的洞察.
- 这种方法为研究大型气态离子提供了新的途径.
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