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Related Concept Videos

High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

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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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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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Gas Chromatography: Introduction01:13

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Gas chromatography (GC) is a technique for separating and analyzing volatile compounds in a sample. Its primary purpose is to identify and quantify components in complex mixtures, making it essential in fields such as environmental analysis, pharmaceuticals, and petrochemicals. GC is also called vapor-phase chromatography (VPC) or gas-liquid partition chromatography (GLPC).
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Gas Chromatography: Types of Columns and Stationary Phases

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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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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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pH-Gradient Liquid Chromatography: Fundamentals and Examples.

Łukasz Kubik1, Paweł Wiczling1, Roman Kaliszan1

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This paper introduces gradient separation techniques, including organic modifier and pH gradients, and their comparison to isocratic separation. A double gradient method is presented for simultaneous determination of analyte properties in complex mixtures.

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Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Gradient elution offers advantages over isocratic separation in chromatography.
  • Understanding elution principles is crucial for analyzing complex mixtures.

Purpose of the Study:

  • To review the fundamentals and recent innovations in gradient separation.
  • To explain organic modifier and pH gradient elution principles.
  • To introduce a double gradient method for simultaneous analyte property determination.

Main Methods:

  • Description of organic modifier- and pH-gradient elution principles.
  • Comparison of gradient elution with isocratic separation.
  • Review of double organic modifier-/pH-gradient elution.

Main Results:

  • Elucidation of differences and similarities between gradient and isocratic separation.
  • Demonstration of the utility of double gradients for complex mixture analysis.

Conclusions:

  • Gradient separation techniques are advanced methods for chromatographic analysis.
  • The double gradient method enables simultaneous determination of logkw and pka values.