相关实验视频

Updated: Jun 23, 2025

GC-based Detection of Aldononitrile Acetate Derivatized Glucosamine and Muramic Acid for Microbial Residue Determination in Soil

GC-based Detection of Aldononitrile Acetate Derivatized Glucosamine and Muramic Acid for Microbial Residue Determination in Soil

Published on: May 19, 2012

自动化方法用于海水中挥发性氨基的灵敏分析

Preston Chebai Akenga¹, Mark F Fitzsimons¹

¹Biogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus,Plymouth PL4 8AA, U.K.

ACS ES&T water

|June 21, 2024

概括

一种新的自动化方法增强了海水中甲基胺 (MA) 的分析,提高了我们对它们在海洋循环中的作用的理解. 这种技术为像二甲基胺和三甲基胺这样的关键化合物提供了更高的灵敏度和样品吞吐量.

科学领域:

海洋化学海洋化学
分析化学分析化学
生物地质化学生物地质化学

背景情况:

甲基胺 (MAs) 是极性,挥发性,含有的有机化合物,对海洋循环至关重要.
准确分析MAs是具有挑战性的,阻碍了对其发生和生态意义的全面理解.
现有的分析方法往往缺乏详细海洋研究所需的灵敏度和吞吐量.

研究的目的:

开发和验证一种自动化头部空间固体相微提取 (HS-SPME) 方法,用于分析海水中的甲基胺.
与现有的MA分析技术相比,提高灵敏度和样本吞吐量.
应用开发的方法来量化南洋海水样本中的MA.

主要方法:

采用了一种自动化的HS-SPME技术,加上气体染色学和酸检测 (GC-NPD).
优化SPME条件,包括温度,平衡和提取参数.
使用海水矩阵对灵敏度,检测极限和样本吞吐量进行方法验证.

主要成果:

与二甲基胺 (DMA) 和单甲基胺 (MMA) 相比,该方法对三甲基胺 (TMA) 的敏感性显著提高 (6-24倍).
使用小海水体积 (2.5-10毫升) 实现了DMA和TMA的检测,检测极限分别为6.6nM和4.1nM.
该方法的样本吞吐量是该方法的4-6倍,并被归类为"实用",BAGI得分为62.5.5.

结论:

开发的自动化HS-SPME-GC-NPD方法为海水中的甲基胺分析提供了标准化和高效的方法.
这一进步有助于更准确地量化MA,从而更深入地了解它们在海洋循环中的作用.
该方法在南洋样本中成功量化了DMA和TMA,证明了其在现实海洋环境中的适用性.

更多相关视频

Fruit Volatile Analysis Using an Electronic Nose

Fruit Volatile Analysis Using an Electronic Nose

Published on: March 30, 2012

Author Spotlight: An Improved Technique for Trimethylamine Detection in Animal-Derived Medicine by Headspace Gas Chromatography-Tandem Quadrupole Mass Spectrometry

Author Spotlight: An Improved Technique for Trimethylamine Detection in Animal-Derived Medicine by Headspace Gas Chromatography-Tandem Quadrupole Mass Spectrometry

Published on: March 10, 2023

相关概念视频

Atomic Absorption Spectroscopy: Lab

Atomic Absorption Spectroscopy: Lab

For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...

Mass Spectrometry of Amines

Mass Spectrometry of Amines

In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule: a molecule with an odd number of nitrogen atoms produces a parent ion with an odd molecular weight. The remaining fragments have an even mass.
Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit...

Volatilization

Volatilization

Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...