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Related Concept Videos

Overview of Fatty Acid Metabolism01:28

Overview of Fatty Acid Metabolism

Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...

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Challenges with fats and fatty acid methods.

D L Palmquist1, T C Jenkins

  • 1Department of Animal Sciences, OARDC/OSU, Wooster, USA. palmquist.1@osu.edu

Journal of Animal Science
|December 18, 2003
PubMed
Summary
This summary is machine-generated.

The Weende ether extraction method inaccurately measures feed fat content. A new method using fatty acid methyl esters quantified by gas-liquid chromatography (GLC) offers a more accurate analysis of total fatty acids for feedstuffs.

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Area of Science:

  • Animal Nutrition
  • Analytical Chemistry
  • Feed Science

Background:

  • The Weende ether extraction method is the official standard for feed fat analysis but has limitations.
  • It inadequately characterizes fat content, extracting nonnutritive lipids and failing to extract all nutritionally valuable fatty acids.
  • Acid hydrolysis, used in some official procedures, is time-consuming and reduces precision.

Purpose of the Study:

  • To introduce a preferred method for feed fat analysis.
  • To accurately determine total fatty acid concentration in feedstuffs.
  • To provide detailed fatty acid profiles for improved feed evaluation.

Main Methods:

  • A one-step esterification procedure converts all lipid classes into fatty acid methyl esters.
  • Quantification of fatty acid methyl esters is performed using gas-liquid chromatography (GLC).
  • The method accounts for nonsaponifiable materials and provides corrected glycerol content.

Main Results:

  • GLC analysis provides comprehensive information on both the quantity and profile of fatty acids in a single run.
  • The method accurately determines total fatty acid content, offering a more precise measure of fat value.
  • It can identify and quantify nonsaponifiable materials and heat-damaged fat polymers.

Conclusions:

  • The total fatty acid content, determined via fatty acid methyl ester analysis, is the correct descriptor for the energy value of fats in feedstuffs.
  • This GLC-based method offers superior accuracy and detail compared to traditional ether extraction.
  • Further adjustments may be needed for commercial fat supplements to ensure quantitative ester preparation.