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相关概念视频

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...

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相关实验视频

Updated: Jun 14, 2026

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
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一个低成本的内部标准装载器,用于固相吸附工具.

F M Vivaldi1, S Reale1, S Ghimenti1

  • 1Department of Chemistry and Industrial Chemistry, University of Pisa, via Giuseppe Moruzzi 13, 56124 Pisa, Italy.

Journal of breath research
|August 11, 2023
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概括
此摘要是机器生成的。

一个新的便携式系统可靠地产生和分发化 (D-) 作为气体样本分析的内部标准. 这提高了呼吸分析等技术的分析精度,确保高达三周的稳定度.

关键词:
呼吸分析 呼吸分析我们的内部标准是内部标准.针陷微提取微提取方法质量控制质量控制质量控制固相提取固相提取的方法

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科学领域:

  • 分析化学 分析化学
  • 环境科学 环境科学
  • 生物医学工程 生物医学工程

背景情况:

  • 固体相吸附对于预先缩和储存气态分析剂至关重要.
  • 内部标准 (IS) 对于减少分析方法的变化和提高分析方法的可靠性至关重要.
  • 准确且可重复的气体内部标准生成对于稳健的分析工作流程至关重要.

研究的目的:

  • 开发和验证一个便携式系统,以产生和装载气态D-toluene作为内部标准.
  • 用各种固体相吸附技术来评估系统的性能,用于气体样本分析.
  • 为了确保内部标准的稳定性和可重复性,用于潜在的呼吸分析应用.

主要方法:

  • 开发一个微控制器控制的便携式系统,配备数字质量流量控制器,用于精确调节流量.
  • 使用旋转编码器或Android应用程序来设置流量和样本体积.
  • 用针式微提取,固相提取和薄膜微提取来测试系统.
  • 使用选择性离子流管质谱学和气色谱学质谱学量化D-托的度.

主要成果:

  • 该系统表现出了优异的空气流控制,在5-200毫升分钟-1的流速范围内,其变化率低于1%.
  • 分配的D-托度的变化小于3%,导致负载量在一天内和一天间的精度低于15%.
  • 在装载器中没有检测到任何转载,D-托的度在室温下在西洛尼特中保持稳定长达三周.

结论:

  • 开发的便携式系统提供了一种可靠和可重复的方法来生成和加载气体内部标准.
  • 该系统显著提高了固体相吸附技术的精度和可靠性,用于气体样本分析,包括呼吸分析.
  • 该系统的稳定性和易用性使其成为各种需要精确气体样本采集和分析的应用的宝贵工具.