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High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

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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: 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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Chromatographic Resolution01:15

Chromatographic Resolution

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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.
The effectiveness of separation can be evaluated by determining the level of separation between two neighboring peaks in a chromatogram, which represents the individual components of a sample.
In chromatography,...
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Optimizing Chromatographic Separations01:15

Optimizing Chromatographic Separations

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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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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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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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Related Experiment Video

Updated: Aug 22, 2025

Curtain Flow Column: Optimization of Efficiency and Sensitivity
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Curtain Flow Column: Optimization of Efficiency and Sensitivity

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Resolving Solvent Incompatibility in Two-Dimensional Liquid Chromatography with In-Line Mixing Modulation.

Shijia Tang1, Cadapakam J Venkatramani1

  • 1Small Molecule Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States.

Analytical Chemistry
|November 10, 2022
PubMed
Summary

A new in-line mixing modulation (ILMM) technique enhances two-dimensional liquid chromatography (2D-LC) for complex molecule analysis. ILMM improves orthogonality and reduces peak distortion, enabling better characterization of challenging samples like oligonucleotides.

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Area of Science:

  • Analytical Chemistry
  • Chromatography Science

Background:

  • Two-dimensional liquid chromatography (2D-LC) is crucial for analyzing complex samples like polymers and biomacromolecules.
  • Achieving orthogonal 2D-LC separations is challenging due to incompatible chromatographic conditions.
  • Existing methods like active solvent modulation (ASM) have limitations in handling complex sample matrices.

Purpose of the Study:

  • To introduce and evaluate a novel in-line mixing modulation (ILMM) strategy for challenging 2D-LC workflows.
  • To demonstrate the effectiveness of ILMM in coupling orthogonal chromatographic techniques.
  • To compare ILMM performance against state-of-the-art active solvent modulation (ASM).

Main Methods:

  • Developed and implemented an in-line mixer, termed in-line mixing modulation (ILMM).
  • Applied ILMM to couple Gel Permeation Chromatography (GPC) with Reversed-Phase Liquid Chromatography (RPLC).
  • Utilized ILMM for coupling Ion-Pair Reversed-Phase (IPRP) with Hydrophilic Interaction Liquid Chromatography (HILIC).
  • Performed comprehensive RPLC×RPLC analysis using ILMM.

Main Results:

  • ILMM significantly reduced peak distortion in GPC-RPLC, enabling a 67% higher transfer volume.
  • ILMM resolved sample breakthrough issues in IPRP×HILIC for antisense oligonucleotide (ASO) analysis.
  • ILMM outperformed ASM in comprehensive RPLC×RPLC analysis.
  • ILMM simplified system configuration and eliminated the need for additional dilution flow.

Conclusions:

  • ILMM is a facile and effective strategy for enabling challenging 2D-LC separations.
  • ILMM offers significant advantages over ASM, including improved peak shape and transfer volume.
  • The ILMM approach provides a versatile platform for characterizing increasingly complex molecules.