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Related Concept Videos

Ion-Exchange Chromatography01:09

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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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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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: 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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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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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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Updated: Apr 5, 2026

A Two-Step Pyrolysis-Gas Chromatography Method with Mass Spectrometric Detection for Identification of Tattoo Ink Ingredients and Counterfeit Products
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Chromatographic Analysis of Inks for Forensic Science Applications.

I R Tebbett1

  • 1Department of Pharmacodynamics, University of Illinois at Chicago, Chicago, IL, USA.

Forensic Science Review
|August 13, 2015
PubMed
Summary
This summary is machine-generated.

Chromatography techniques like Thin Layer Chromatography (TLC) and High-Performance Liquid Chromatography (HPLC) are used to analyze and compare ink components for forensic applications. These methods also help determine ink age by tracking compositional changes over time.

Keywords:
ChromatographyHPLCTLCink analysisquestioned documents

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Area of Science:

  • Analytical Chemistry
  • Forensic Science

Background:

  • Chromatography is a key technique for separating and comparing complex mixtures.
  • Ink analysis is crucial in forensic science for document examination and authentication.

Purpose of the Study:

  • To review chromatographic methods for ink component separation and comparison.
  • To evaluate Thin Layer Chromatography (TLC) and High-Performance Liquid Chromatography (HPLC) for ink analysis.
  • To explore the application of these techniques in determining ink age.

Main Methods:

  • Review of existing literature on TLC and HPLC for ink analysis.
  • Description of TLC systems for separating different ink types.
  • Outline of recent advancements and applications of HPLC in ink analysis.

Main Results:

  • TLC is the standard method for ink comparison.
  • HPLC offers greater sensitivity and resolution, making it a powerful alternative.
  • Both TLC and HPLC can measure ink composition changes over time to estimate ink age.

Conclusions:

  • Chromatographic techniques, particularly HPLC, are valuable tools for detailed ink analysis.
  • These methods contribute significantly to forensic investigations and document dating.
  • Future research trends point towards further advancements in chromatographic ink analysis.