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Peptide Identification Using Tandem Mass Spectrometry01:33

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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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使用红外光谱学和计算方法描述小和二甲基硫氧化物之间的相互作用.

Aneta Panuszko1, Przemysław Pastwa1, Jacek Gajewski1

  • 1Department of Physical Chemistry, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland.

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二甲基硫氧化物 (DMSO) 不直接与小酸,如甘氨酸和N-乙-甘氨酸-甲基胺 (NAGMA) 结合. 相反,DMSO通过改变周围的水分子来间接影响的水化,从而影响的稳定性.

关键词:
DFT计算的计算方法在FTIR光谱学中使用.甲基二甲基硫氧化物二甲基硫氧化物质化的水合化.水水水的水水的水

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科学领域:

  • 生物物理化学 生物物理化学
  • 计算化学计算化学
  • 频谱学是一种光谱学.

背景情况:

  • 了解溶剂-相互作用对于预测生物系统中的行为至关重要.
  • 甲基二硫氧化物 (DMSO) 是用于类研究的常见辅溶剂,但其与类的精确相互作用机制仍然不完全理解.
  • 小可以作为研究基本-溶剂相互作用的模型系统.

研究的目的:

  • 阐明二甲基硫氧化物 (DMSO) 和两个小型模型:二甲酸氨酸和N-乙-甘氨酸-甲基胺 (NAGMA) 之间的相互作用机制.
  • 调查DMSO如何影响这些在水溶液中的水化和键网络.
  • 为了确定DMSO是否直接与结合,或者通过调节水结构来间接影响它们.

主要方法:

  • 减弱总反射度里埃变换红外光谱法 (ATR-FTIR) 用于研究-溶剂相互作用.
  • 密度函数理论 (DFT) 计算,包括DFT/ONIOM方法,用于在分子层面上建模相互作用.
  • 对HDO光谱的分析允许隔离和描述受和DMSO影响的水分子.

主要成果:

  • FTIR和DFT的结果表明,DMSO和研究中的之间没有直接的化学键.
  • 发现DMSO通过改变周围水分子的键来间接影响酸水化外.
  • 在滴糖系统中,DMSO在的水化球中加强了水键.
  • 由于水化结构的相似性,DMSO对NAGMA的水化外产生了较为温和的影响,略微削弱了键.

结论:

  • DMSO对的水分和稳定性的影响是间接的,通过周围水结构的变化来调解.
  • DMSO对的水化外的影响是不同的,这取决于的特定结构特征和水化特性.
  • 这些发现强调了考虑溶剂介导相互作用在理解的行为和稳定性方面的重要性.