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High-Performance Liquid Chromatography: Elution Process01:05

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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(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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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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Silica Gel Column Chromatography: Overview01:10

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Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
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Nanoparticle Tracking Analysis of Gold Nanoparticles in Aqueous Media through an Inter-Laboratory Comparison
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Performance of nanoflow liquid chromatography using core-shell particles: A comparison study.

Ya Liu1, Kaiyue Sun1, Chuyi Shao1

  • 1Department of Chemistry and The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

Journal of Chromatography. A
|May 16, 2021
PubMed
Summary

Core-shell materials show high efficiency in nanoLC separations for proteomics, achieving significant peak capacity. While not always outperforming porous particles, they offer complementary protein identification in nanoLC-MS analyses.

Keywords:
Capillary column technologyCore-shell particleNanoflow liquid chromatographyProteomicsSingle particle fritSuperficially porous particle

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Area of Science:

  • Chromatography
  • Proteomics
  • Analytical Chemistry

Background:

  • Core-shell materials offer improved chromatographic performance over conventional porous materials in analytical columns.
  • The proteomics field requires high-resolution microseparation tools for complex biological samples.
  • NanoLC (nanoscale liquid chromatography) is a key technique for protein analysis.

Purpose of the Study:

  • To investigate the chromatographic performance and resolving power of core-shell materials in a nanoLC format for proteomics.
  • To evaluate the efficiency and peak capacity of core-shell nanoLC columns for protein digests.
  • To compare the protein identification capabilities of core-shell and totally porous nanoLC columns using mass spectrometry.

Main Methods:

  • Packed nanoLC columns (100 µm i.d.) with core-shell and totally porous particles (5 µm).
  • Evaluated van Deemter curves and achieved plate heights for dynamic studies.
  • Performed isocratic and gradient separations of neutral compounds and protein digests (HeLa cell lysate).
  • Analyzed identified proteins using nanoLC-MS/MS.

Main Results:

  • Core-shell nanoLC columns exhibited similar van Deemter curves to totally porous columns, with no significant dynamic advantage in 100 µm i.d. columns.
  • High efficiencies were achieved for both column types, reaching plate heights of ~11 µm (90,000 plates/meter) with 5 µm particles.
  • A 60 cm core-shell nanoLC column yielded 72,000 plates in isocratic separation; a 15 cm column achieved a peak capacity of 220 in a 5-hour gradient.
  • Identification of 2546 proteins with core-shell vs. 2916 with totally porous columns, with 1830 common proteins and unique identifications suggesting complementarity.

Conclusions:

  • Core-shell nanoLC columns demonstrate high efficiency and resolving power suitable for proteomics applications.
  • While not universally superior to totally porous columns in nanoLC, core-shell materials provide valuable complementary data in proteomics.
  • The findings support the use of both core-shell and totally porous nanoLC columns for comprehensive protein identification in nanoLC-MS based proteomics.