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Related Concept Videos

High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

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...
High-Performance Liquid Chromatography: Instrumentation00:57

High-Performance Liquid Chromatography: Instrumentation

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.
High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

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.
In HPLC, two phases play a critical role in the separation process:
Gas Chromatography: Sample Injection Systems01:08

Gas Chromatography: Sample Injection Systems

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...
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

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 properties and...
Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall. The coating...

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Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts
08:15

Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts

Published on: February 7, 2017

Temperature Programming for High-Speed GC.

C Leonard1, A Grall, R Sacks

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109.

Analytical Chemistry
|June 14, 2011
PubMed
Summary
This summary is machine-generated.

High-speed gas chromatography uses fast temperature programming and short columns for rapid separations. Optimal conditions balance speed and peak capacity for complex mixtures.

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Published on: January 23, 2018

Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • High-speed separations are crucial for analyzing complex mixtures efficiently.
  • Traditional gas chromatography (GC) methods can be time-consuming.
  • Optimizing temperature programming and column parameters is key to achieving faster analyses.

Purpose of the Study:

  • To evaluate high-speed temperature-programmed gas chromatography (HS-TPGC) for separating wide boiling point range mixtures.
  • To determine the impact of programming rate, column length, and carrier gas velocity on peak capacity and analysis time.
  • To identify optimal conditions for maximizing peak capacity generation rate and total peak capacity.

Main Methods:

  • Utilized fast temperature programming (20-50 °C/min) with short separation columns (3.6-25.4 m).
  • Employed a cryofocusing inlet to generate narrow injection plugs.
  • Analyzed normal alkanes (C8-C19) to assess local peak capacity, peak capacity generation rate, and total cumulative peak capacity.
  • Varied average carrier gas velocities (50-200 cm/s).

Main Results:

  • A 6.8-m column at 50 °C/min and 100 cm/s achieved 168 peaks for C19 in 178 s.
  • Reducing the programming rate to 20 °C/min doubled elution time with only a 20% increase in peak capacity.
  • A 25.4-m column at 50 °C/min yielded 279 peaks for C19 in 262 s.
  • Carrier gas velocities >100 cm/s significantly reduced total peak capacity with minimal time savings.

Conclusions:

  • Fast temperature programming with optimized column length and carrier gas velocity enables high-speed GC separations.
  • Slower programming rates offer diminishing returns in peak capacity for increased analysis time.
  • High carrier gas velocities common in isothermal GC are detrimental to peak capacity in HS-TPGC.