Formation of traces of conjugated tetraenoic and trienoic constituents in autoxidized linolenic and linoleic acids and vegetable oils during alkali-isomerization View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1949-06

AUTHORS

Margaret L. Swain, B. A. Brice

ABSTRACT

It has been shown that the low-intensity absorption bands characteristics of conjugated tetraenoic and trienoic fatty acids frequently encountered in the ultra-violet spectra of alkali-isomerized vegetable oils prepared by ordinary commercial or laboratory extraction techniques have their probable origin in oxidation products of linolenic and linoleic acid, respectively. Similar bands are found in the spectra of mildly autoxidized preparations of pure linolenic and linoleic acids after either alkali-isomerization or heating at 180°C. in neutral ethylene glycol.Tetraenoic and trienoic conjugation formed from oxidation products of linolenic and linoleic acids during alkali-isomerization can be differentiated from the tetraenoic and trienoic conjugation produced by alkali-isomerization of arachidonic and linolenic acids, respectively, by spectrophotometric examination of the sample after heating in neutral ethylene glycol. Essentially equal amounts of conjugation are formed from the fatty acid oxidation products on heating and on alkali-isomerization while no conjugation is obtained from arachidonic and linolenic acids on heating in the absence of alkali. More... »

PAGES

272-277

References to SciGraph publications

  • 1948-02. Decomposition of methyl hydroperoxido oleate in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1946-05. Applied ultraviolet spectrophotometry of fats and oils in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1945-09. Spectrophotometric determination of small proportions of polyunsaturated constituents in fatty materials in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1945-02. A spectrophotometric method for differentiating between lard and hydrogenated vegetable oils in OIL & SOAP
  • 1946-01. Spectral properties of linoleic and linolenic acids prepared by debromination in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
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    URI

    http://scigraph.springernature.com/pub.10.1007/bf02651482

    DOI

    http://dx.doi.org/10.1007/bf02651482

    DIMENSIONS

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