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Separation and quantitation of linoleic acid oxidation products in mammary gland tissue from mice fed low- and high-fat diets

  • Published:
Lipids

Abstract

We have developed an assay for the isolation and quantitation by gas chromatography-mass spectrometry (GC-MS) of free 9- and 13-hydroxyoctadecadienoic acid (9-HODE, 13-HODE) in the mammary glands of female mice. Internal standards consisting of 18O2-labeled analogs of 9- and 13-HODE are added to pulverized frozen tissue prior to extraction with ethanol. Nonlipid materials are removed in a chloroform/methanol/water extraction step. The remaining lipid material is methylated with ethereal diazomethane, and much of the nonoxygenated fatty acid methyl esters are removed via silica solid-phase extraction. Samples are either further derivatized with bis(trimethylsilyl)trifluoroacetamide to form the trimethylsilyl ethers for quantitative analysis by GC-MS or are analyzed as the methyl esters by chiral high-performance liquid chromatography to determine the enantiomeric distribution of the 9- and 13-HODE. The extraction and quantitation protocol was applied to the analysis of mammary glands for free 9- and 13-HODE from mice fed isocaloric diets containing 20% corn oil, 5% corn oil, or 20% beef tallow. Chiral analysis of the products showed higher production of 13(S)-HODE relative to 13(R)-HODE; the enantiomeric excess is most likely due to enzymatic production of 13-HODE superimposed on a background of autoxidative production of 13(R)-plus 9(S)- and 9(R)-HODE. In addition, the effect of sample handling and storage conditions on the formation of 9- and 13-HODE in the samples was assessed by exposing aliquots of a common pool of rat mammary gland tissue to specified conditions prior to analysis. This methodology will be important during investigations of the contribution of linoleate oxidation products to the enhancement of mammary tumorigenesis by dietary fat.

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Abbreviations

ANOVA:

analysis of variance

BHT:

butylated hydroxytoluene

BSTFA:

bis(trimethylsilyl)trifluoroacetamide

GC-MS:

gas chromatography-mass spectrometry

9-HODE:

9-hydroxyoctadecadienoic acid

13-HODE:

13-hydroxyoctadecadienoic acid

HPLC:

high-performance liquid chromatography

ME:

methyl ester

TMCS:

trimethylchlorosilane

TMS:

trimethylsilyl

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Authors and Affiliations

  1. Oakland University, 48309, Rochester, Michigan

    Mary L. Blackburn & Arthur W. Bull

  2. MSU/NIH Mass Spectrometry Facility, Department of Biochemistry, Michigan State University, 48824, East Lansing, MI

    Jennifer A. Johnson, Clifford W. Welsch & J. Throck Watson

Authors
  1. Jennifer A. Johnson
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  2. Mary L. Blackburn
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  3. Arthur W. Bull
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  4. Clifford W. Welsch
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  5. J. Throck Watson
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Johnson, J.A., Blackburn, M.L., Bull, A.W. et al. Separation and quantitation of linoleic acid oxidation products in mammary gland tissue from mice fed low- and high-fat diets. Lipids 32, 369–375 (1997). https://doi.org/10.1007/s11745-997-0047-7

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  • DOI: https://doi.org/10.1007/s11745-997-0047-7

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