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Related Concept Videos

Thin-Layer Chromatography (TLC): Overview01:11

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Thin-layer chromatography (TLC) is a chromatography technique that separates compounds based on their polarity. TLC typically uses polar silica gel, a form of silicon dioxide, as the stationary phase. The silica gel contains hydroxyl (OH) groups on its surface, which form hydrogen bonds with polar compounds, influencing their adhesion to the stationary phase.
To begin the analysis, a mixture of compounds is spotted on the starting line on the TLC plate using a thin capillary. The bottom of the...
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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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Gas Chromatography: Types of Columns and Stationary Phases01:17

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Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves.
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Chromatography: Introduction01:10

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Chromatography is a technique used to separate compounds based on differences of partitioning between two phases, the stationary phase and the mobile phase.
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High-Performance Liquid Chromatography: Types of Detectors01:15

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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...
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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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Thin-layer Chromatographic TLC Separations and Bioassays of Plant Extracts to Identify Antimicrobial Compounds
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Instrument platforms for thin-layer chromatography.

Pierre Bernard-Savary1, Colin F Poole2

  • 1Chromacim SAS, L'Ancienne Eglise, 38340 Pommiers-la-Placette, France.

Journal of Chromatography. A
|August 12, 2015
PubMed
Summary
This summary is machine-generated.

High-performance thin-layer chromatography (TLC) offers flexible, automated analysis using separate devices for each step. This review covers contemporary TLC instrumentation, emphasizing variety and performance for enhanced analytical workflows.

Keywords:
Charged-coupled devicesDensitometersDerivatizationDevelopment chambersGradient developmentHigh-performanceMass spectrometryRadiochromatographySample applicatorsSpectroscopic interfacesThin-layer chromatography

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Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Column and thin-layer chromatography (TLC) are key instrumental techniques.
  • TLC offers greater flexibility with separate devices for each unit operation, typically at atmospheric pressure, supporting diverse analytical workflows.

Purpose of the Study:

  • To review contemporary instrumentation for thin-layer chromatography (TLC).
  • To emphasize the variety and performance of commercially available systems for TLC unit operations.

Main Methods:

  • Review of contemporary instrumentation for TLC sample application, development, and evaluation.
  • Discussion of optional derivatization, photodocumentation, densitometric evaluation, and hyphenation with spectroscopic detectors.

Main Results:

  • TLC instrumentation allows for manual, semi-automated, or fully automated separation processes.
  • Contemporary trends focus on user-independent unit operations and simultaneous sample separation.
  • A wide variety of commercial systems are available, impacting performance, repeatability, and detectability.

Conclusions:

  • The diversity of TLC equipment enhances analytical flexibility and automation.
  • Instrument platforms significantly influence analytical outcomes and efficiency.
  • Best practices and common mistake avoidance are crucial for optimal TLC analysis.