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Related Concept Videos

Principles Of Column Chromatography01:13

Principles Of Column Chromatography

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...
High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

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...
High-Performance Liquid Chromatography: Instrumentation00:57

High-Performance Liquid Chromatography: Instrumentation

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.
High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

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.
In HPLC, two phases play a critical role in the separation process:
Types Of Column Chromatography01:29

Types Of Column Chromatography

The stability and compatibility of column material with samples are crucial for efficient purification in chromatographic techniques. Various operating parameters such as pH, temperature, or solvent affect the packing of the column material, thereby determining the purification efficiency. The choice of column material also plays an essential role in deciding the operating parameters and can be modified based on the proteins that need to be purified.
Gel Filtration Chromatography
When the...
Gas Chromatography: Types of Columns and Stationary Phases01:17

Gas Chromatography: Types of Columns and Stationary Phases

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.
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...

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Method development validation for corticoids in animal feed samples by liquid chromatography using a monolithic

Roberto Muñiz-Valencia1, Raquel Gonzalo-Lumbreras, Ana Santos-Montes

  • 1Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain.

Journal of Separation Science
|November 22, 2007
PubMed
Summary
This summary is machine-generated.

A new LC method accurately determines corticosteroids (CC) in poultry feed. This validated method ensures reliable detection for enhanced food safety and quality control.

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Area of Science:

  • Analytical Chemistry
  • Food Science
  • Veterinary Medicine

Background:

  • Corticosteroids (CC) are used in animal feed, necessitating accurate detection methods.
  • Existing methods may lack the sensitivity or specificity required for regulatory compliance.
  • Ensuring the safety and quality of poultry products requires robust analytical techniques.

Purpose of the Study:

  • To develop and validate a reliable liquid chromatography (LC) method for determining corticosteroids in poultry feed.
  • To optimize separation conditions for sensitive and accurate CC quantification.
  • To validate the method according to EU criteria for quantitative screening.

Main Methods:

  • Development of an LC method using a Chromolith column and UV detection.
  • Optimization of mobile phase composition (acetonitrile/water), flow rate, and temperature.
  • Sample preparation involving leaching, saponification, and solid-phase extraction (SPE).
  • Method validation including extraction efficiency, decision limits (CCα), and detection capabilities (CCβ).

Main Results:

  • Optimized separation achieved at 40°C with ACN/water (21:79 v/v) and 3 mL/min flow rate, separating 4/7 CCs in ~10 min.
  • Extraction efficiencies ranged from 86-92%.
  • Decision limits (CCα) were 27-36 µg/kg, and detection capabilities (CCβ) were 33-43 µg/kg.
  • Repeatability and reproducibility were below 9.0% and 9.4%, respectively.
  • Method accuracy was 98-103%, with robustness CV < 3.8%.

Conclusions:

  • A validated LC-UV method provides accurate and reliable determination of corticosteroids in poultry feed.
  • The method meets EU criteria for quantitative screening, ensuring regulatory compliance.
  • This analytical approach contributes to enhanced food safety and quality control in the poultry industry.