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High-Performance Liquid Chromatography: Instrumentation00:57

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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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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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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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High-Performance Liquid Chromatography: Types of Detectors01:15

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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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Gas chromatography (GC) is a technique for separating and analyzing volatile compounds in a sample. Its primary purpose is to identify and quantify components in complex mixtures, making it essential in fields such as environmental analysis, pharmaceuticals, and petrochemicals. GC is also called vapor-phase chromatography (VPC) or gas-liquid partition chromatography (GLPC).
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High Performance Liquid Chromatography at -196 °C.

Tomohiro Motono1, Shinya Kitagawa1, Hajime Ohtani1

  • 1Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology , Gokiso, Showa, Nagoya 466-8555, Japan.

Analytical Chemistry
|June 11, 2016
PubMed
Summary
This summary is machine-generated.

Ultralow temperature high-performance liquid chromatography (HPLC) using liquefied gas mobile phases successfully separated alkanes where gas chromatography failed. Retention control was achieved by adjusting mobile phase composition, demonstrating a novel approach for ultralow temperature separations.

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Area of Science:

  • Analytical Chemistry
  • Chromatography
  • Physical Chemistry

Background:

  • Gas chromatography (GC) struggles with low molecular weight alkane separation at ultralow temperatures due to strong analyte adsorption.
  • High-performance liquid chromatography (HPLC) has not been extensively explored at ultralow temperatures.

Purpose of the Study:

  • To develop and investigate ultralow temperature HPLC using liquefied gases as mobile phases.
  • To explore the chromatographic behavior and retention mechanisms of alkanes at -196 °C.
  • To demonstrate control over analyte retention by manipulating mobile phase composition.

Main Methods:

  • Development of an ultralow temperature HPLC system utilizing liquefied gas mobile phases (e.g., liquid nitrogen).
  • Investigation of alkane separation at -196 °C.
  • Systematic study of column temperature effects on analyte retention.
  • Experimentation with mixed mobile phases (nitrogen and methane) to control retention.

Main Results:

  • Successful separation of low molecular weight alkanes at -196 °C using liquid nitrogen as the mobile phase, overcoming GC limitations.
  • Analyte retention significantly increased when column temperature exceeded the mobile phase boiling point.
  • Mobile phase composition (nitrogen-methane mixtures) effectively controlled analyte retention, similar to conventional HPLC.
  • Altered selectivity for n- and iso-alkanes compared to room temperature GC.
  • Significant enhancement in alkane retention observed in ultralow temperature HPLC.

Conclusions:

  • Ultralow temperature HPLC with liquefied gas mobile phases is a viable technique for separating challenging analytes like low molecular weight alkanes.
  • Analyte retention at -196 °C can be effectively controlled by mobile phase composition.
  • This technique offers unique selectivity and enhanced retention compared to traditional GC.