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Related Concept Videos

Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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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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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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Overview Of Cell Separation And Isolation01:20

Overview Of Cell Separation And Isolation

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Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.
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Precipitation and Co-precipitation01:17

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Centrifugation01:05

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Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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Principles Of Column Chromatography01:13

Principles Of Column Chromatography

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The chromatography technique was first invented in 1901 by Michael S. Tswett, a Russian botanist, to separate plant pigments using organic solvents. Further, in 1941, Archer John Porter Martin and R. L. M. Synge modified the technique by packing silica gel into a column. A mixture of amino acids was then separated on the packed column using chloroform and water mixture as the mobile phase. This was the first report on column chromatography. At present, column chromatography is a widely used...
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Related Experiment Video

Updated: Jan 13, 2026

Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography
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Countercurrent Separations as Effective Purification Techniques for Iridoids.

Ana Mayela Ramos-de-la-Peña1, Gilda Guimarães Leitão2,3, Emilio Méndez-Merino4

  • 1School of Engineering and Science, Tecnologico de Monterrey, Monterrey, NL, Mexico.

Journal of Separation Science
|October 28, 2025
PubMed
Summary
This summary is machine-generated.

Countercurrent separation (CCS) effectively purifies iridoids, natural compounds with significant biological activities. This review details CCS fundamentals and optimization factors for industrial-scale iridoid recovery in food, pharmaceutical, and cosmetic applications.

Keywords:
Iridoidscentrifugal partition chromatographyhigh‐speed countercurrent chromatographynatural compound isolation

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Separation of Bioactive Small Molecules, Peptides from Natural Sources and Proteins from Microbes by Preparative Isoelectric Focusing IEF Method
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Last Updated: Jan 13, 2026

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Separation of Bioactive Small Molecules, Peptides from Natural Sources and Proteins from Microbes by Preparative Isoelectric Focusing IEF Method
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Area of Science:

  • Natural Product Chemistry
  • Separation Science
  • Process Engineering

Background:

  • Iridoids are natural compounds with diverse biological and pharmacological activities.
  • Purification of iridoids is crucial for their application in various industries.
  • Countercurrent separation (CCS) is a liquid-liquid partitioning technique suitable for natural product purification.

Purpose of the Study:

  • To review the fundamentals of countercurrent separation (CCS).
  • To critically analyze existing studies on iridoid purification using CCS.
  • To identify key factors for optimizing CCS of iridoids for industrial scale-up.

Main Methods:

  • Literature review of countercurrent separation techniques.
  • Analysis of studies focusing on iridoid purification via CCS.
  • Identification and discussion of critical process parameters.

Main Results:

  • CCS is a scalable and effective method for iridoid purification.
  • Solvent system selection, processing parameters, and sample pretreatment significantly impact separation efficiency.
  • Existing studies demonstrate the potential of CCS for high-purity iridoid recovery.

Conclusions:

  • CCS offers a promising approach for the industrial-scale purification of iridoids.
  • Optimization of CCS parameters is essential for efficient iridoid recovery.
  • Successful implementation of CCS can facilitate iridoid utilization in the food, pharmaceutical, and cosmetic industries.