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相关概念视频

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

448
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
448
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
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High-Performance Liquid Chromatography: Elution Process01:05

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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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相关实验视频

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Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples
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双模式单元固相微提取的理论和协议.

Yun-Jiao Ma1, Ling Zhang1, Bei-Wei Zhu1

  • 1SKL of Marine Food Processing & Safety Control, National Engineering Research Center of Seafood, Collaborative Innovation Center of Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian, 116034, China.

Talanta
|December 23, 2023
PubMed
概括

一种新的双模式单元固相微提取 (DMU-SPME) 方法平衡了挥发性和低挥发性化合物的提取. 这种技术可以增强复杂样品中的化合物分析,例如食品和环境矩阵.

关键词:
平衡固体相微提取的微提取方法双模式单元 双模式单元低挥发性化合物是一种低挥发性化合物.挥发性化合物 挥发性化合物

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科学领域:

  • 分析化学 分析化学
  • 分离科学 分离科学
  • 样品准备技术 样品准备技术

背景情况:

  • 固相微提取 (SPME) 由于提取偏差,在全面分析挥发性化合物方面面临限制.
  • 现有的方法,如Headspace SPME (HS-SPME) 和直接浸泡SPME (DI-SPME),在同时提取具有不同挥发性的化合物方面存在挑战.

研究的目的:

  • 引入和验证一种新的SPME模式,双模式单元固相微提取 (DMU-SPME).
  • 从复杂样本中实现平衡地提取挥发性和低挥发性化合物.
  • 为了克服传统的SPME方法中固有的偏差.

主要方法:

  • 开发和应用双模式单元固相微提取 (DMU-SPME) 技术.
  • 评估DMU-SPME方法的线性,量化极限和稳定性.
  • 用大豆作为复杂矩阵对DMU-SPME与HS-SPME和DI-SPME进行比较分析.

主要成果:

  • DMU-SPME表现出极好的线性 (R2 ≥0.994) 和较低的定量限值 (0.12-240μg/L).
  • 该方法显示出高稳定性,在日内和日内分析中相对标准偏差低于20%.
  • 对大豆的应用确定了107种化合物,包括所有由HS-SPME和DI-SPME检测到的化合物,证实了全面的提取.

结论:

  • DMU-SPME有效地平衡了挥发性和低挥发性化合物的提取,克服了传统SPME的局限性.
  • 与HS/DI-SPME相比,该方法受到分区系数 (Kfs0和Kfs) 的影响较小.
  • DMU-SPME是一种高效和多功能提取技术,用于分析复杂的食品,医疗和环境样本.