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Related Concept Videos

Gas Chromatography: Sample Injection Systems01:08

Gas Chromatography: Sample Injection Systems

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In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
Two primary injection methods are used...
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Supercritical Fluid Chromatography01:18

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Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
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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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High-performance liquid chromatography, or HPLC, is an analytical technique that separates liquid samples under high pressures. An HPLC instrument consists of glass bottles for storing solvents called mobile phase reservoirs. HPLC-grade solvents are used to maintain high purity, and the dissolved gases are removed using a degasser, such as a vacuum pumping system or sparging with helium. The solvents are then pumped into the analytical column using a screw-driven syringe or reciprocating pumps.
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High-Performance Liquid Chromatography: Introduction01:11

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High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
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Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
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Curtain Flow Column: Optimization of Efficiency and Sensitivity
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Development of a split-flow system for high precision variable sample introduction in supercritical fluid

Miho Sakai1, Yoshihiro Hayakawa2, Yasuhiro Funada2

  • 1Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Miyazaki Agricultural Research Institute, 5805 Shimonaka, Sadowara-cho, Miyazaki, Miyazaki 880-0212, Japan.

Journal of Chromatography. A
|August 14, 2017
PubMed
Summary

A new split-flow sample introduction system for supercritical fluid chromatography (SFC) offers robust, variable sample injection. This system precisely controls sample introduction rates using differential pressure, ensuring high reproducibility for diverse compounds.

Keywords:
Back pressure regulatorMake-up pumpSample injectionSplit-flowSupercritical fluid chromatography

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Area of Science:

  • Analytical Chemistry
  • Chromatography
  • Separation Science

Background:

  • Supercritical Fluid Chromatography (SFC) requires precise sample introduction for optimal separation.
  • Existing injection systems may lack the flexibility for variable sample volumes and diverse analytes.
  • Controlling injection rates is crucial for reproducibility and method robustness in SFC.

Purpose of the Study:

  • To develop and validate a novel variable sample injection system for SFC.
  • To investigate the control mechanisms and factors influencing sample introduction rate.
  • To demonstrate the system's reproducibility and universality across various compounds.

Main Methods:

  • Implementation of a split-flow sample introduction system utilizing full-loop injection.
  • Mobile phase splitting achieved via differential pressure between two back pressure regulators (BPRs).
  • Analysis of control factors, including column-side pressure drops (ΔPcolumnsideinsplitless and ΔPcolumnsideinsplit) and make-up flow.

Main Results:

  • The split-flow system demonstrated high reproducibility and universality for nine diverse compounds.
  • Sample introduction rate was effectively controlled by the ratio of column-side pressure drops.
  • Increasing make-up flow precisely reduced the injected sample amount, allowing fine control even at low rates.

Conclusions:

  • The proposed split-flow sample introduction system is a robust solution for variable sample injection in SFC.
  • The system offers precise control over sample introduction rates, independent of introduction conditions.
  • This technology enhances SFC method development by providing a versatile and reliable injection mechanism.