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Chromatographic Methods: Terminology01:18

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Chromatography is an analytical technique widely used in fields such as chemistry, biology, environmental science, and pharmaceuticals to separate the components of a mixture and identify substances between them. The process of chromatography is based on the interactions between two distinct phases: the stationary phase and the mobile phase. The stationary phase is fixed in place by a supporting material, while the mobile phase moves over it, carrying the solutes. As the mobile phase travels,...
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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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The rate theory of chromatography provides quantitative insight into the shapes and widths of elution bands. These bands are based on the random-walk mechanism governing molecular migration within a column. The Gaussian profile of chromatographic bands arises from the cumulative effect of random molecular motions as they progress through the column.
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In chromatography, a solute moves through a chromatographic column and tends to spread, forming a Gaussian-shaped band. The longer the solute spends in the column, the broader the band becomes. The broadening can lead to overlaps within the column, affecting separation effectiveness.
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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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Chromatographic speed classification for liquid chromatography using average theoretical peak time (ATPT).

Tiago Schena1, Carin von Mühlen2

  • 1Faculty of Technology, Universidade Estadual do Rio de Janeiro (UERJ), Presidente Dutra highway, km 298, Resende, (RJ), 27537-000, Brazil; LECO Instruments, Av. Das Nações Unidas, 12399 - Cj121B, São Paulo, (SP), 04578-000, Brazil.

Analytica Chimica Acta
|January 5, 2024
PubMed
Summary

A new metric, Average Theoretical Peak Time (ATPT), classifies liquid chromatography (LC) speed. This metric moves beyond simple analysis time to categorize methods from normal to hyper-speed separations, aiding in LC method optimization.

Keywords:
Average theoretical peak timeChromatographic speedLiquid chromatography methodsOptimization parameterPCA

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Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Liquid chromatography (LC) techniques have advanced significantly, improving performance and speed.
  • Existing methods for classifying chromatographic speed are outdated and analyte-dependent.
  • A unified metric is needed to accurately evaluate and compare the analytical speed of diverse LC techniques.

Purpose of the Study:

  • To introduce and validate the Average Theoretical Peak Time (ATPT) as a novel, unified metric for classifying chromatographic speed.
  • To establish objective categories for LC separation speeds.
  • To demonstrate ATPT's utility in evaluating LC method optimization over time.

Main Methods:

  • Utilized Principal Component Analysis (PCA) on a dataset of over 50 publications.
  • Calculated ATPT values for various LC techniques.
  • Classified LC methods into speed categories based on ATPT values.

Main Results:

  • Developed a classification system for LC methods: normal (ATPT > 18000 ms/peak), high (4000-18000 ms/peak), and hyper-speed (1000-4000 ms/peak).
  • Identified HPLC, nano-LC, SFC, and CEC as normal-speed methods.
  • UHPLC techniques were classified as high-speed, while LC x LC methods fell into hyper-speed separations.
  • Observed a trend of decreasing ATPT values in recent publications, indicating method improvement.

Conclusions:

  • ATPT is a robust metric for classifying the separation speed of one-dimensional and multidimensional LC techniques.
  • ATPT serves as a valuable tool for evaluating LC method optimization.
  • This metric corrects the historical reliance on separation time for speed assessment.