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Related Concept Videos

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:
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.
Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
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...
Optimizing Chromatographic Separations01:15

Optimizing Chromatographic Separations

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.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...

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Updated: Jul 4, 2026

Simple In-House Ultra-High Performance Capillary Column Manufacturing with the FlashPack Approach
13:36

Simple In-House Ultra-High Performance Capillary Column Manufacturing with the FlashPack Approach

Published on: December 4, 2021

Separation efficiency of particle-packed HPLC microchips.

Steffen Ehlert1, Karsten Kraiczek, Jose-Angel Mora

  • 1Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany.

Analytical Chemistry
|June 12, 2008
PubMed
Summary

Achieving high separation efficiency in microchip high-performance liquid chromatography (HPLC) requires dense packing of the separation channels. This study demonstrates that microchip HPLC can reach efficiencies comparable to nano-HPLC through optimized packing techniques.

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Last Updated: Jul 4, 2026

Simple In-House Ultra-High Performance Capillary Column Manufacturing with the FlashPack Approach
13:36

Simple In-House Ultra-High Performance Capillary Column Manufacturing with the FlashPack Approach

Published on: December 4, 2021

Automated HPLC Separation Using LC-Mate: An Integrated Repetitive Autosampler and Fraction Collector for Microscale Purification
07:11

Automated HPLC Separation Using LC-Mate: An Integrated Repetitive Autosampler and Fraction Collector for Microscale Purification

Published on: February 27, 2026

Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Microfluidics

Background:

  • Microchip high-performance liquid chromatography (HPLC) offers miniaturization advantages but faces challenges in achieving high separation efficiency.
  • Traditional HPLC relies on packed columns, where packing density critically influences separation performance.
  • Optimizing packing density in microchip-based separation channels is essential for realizing their full potential.

Purpose of the Study:

  • To experimentally investigate the impact of bed density on separation efficiency in prototype HPLC microchips.
  • To determine optimal packing conditions for microchip HPLC separation channels.
  • To compare the separation efficiency of microchip HPLC with conventional nano-HPLC.

Main Methods:

  • Development of prototype HPLC microchips with minimal dead volume, trapezoidal channels, and on-chip UV detection.
  • Utilizing a custom stainless steel holder for microchip packing under high pressure (up to 400 bar) and ultrasonication.
  • Systematic investigation of bed densities, pressure drop, and separation efficiency under isocratic elution.
  • Analysis of plate height curves to assess mobile phase mass transfer resistance and hydrodynamic dispersion.

Main Results:

  • Bed density was consistently related to pressure drop and separation efficiency.
  • Increased bed density led to decreased mobile phase mass transfer resistance.
  • High bed densities are crucial for mitigating hydrodynamic dispersion in noncylindrical microchannels.
  • Achieved packing densities in microchip HPLC channels comparable to those in nano-HPLC fused-silica capillaries.

Conclusions:

  • Dense packing of HPLC microchips is critical for achieving high separation efficiency.
  • Microchip HPLC can attain separation efficiencies comparable to nano-HPLC when packing is optimized.
  • This study validates the potential of microchip HPLC for high-performance separations.