Influence of alkali concentration and other factors on the conjugation of natural polyunsaturated acids as determined by ultraviolet absorption measurements View Full Text


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Article Info

DATE

1952-11

AUTHORS

S. F. Herb, R. W. Riemenschneider

ABSTRACT

Optimum conditions for production of maximum conjugation of methyl arachidonate were determined. These comprise heating the sample in 21% KOH glycol for 15 minutes at 180°C. The optimum conditions of isomerization have also been applied to methyl linoleate, methyl linolenate, methyl eicosapentaenoate, and docosapentaenoate prepared by physical methods. These conditions greatly increased the sensitivity of the spectrophotometric method for all the polyun-saturated acids except linoleic, for which the sensitivity was unchanged.Analyses of a series of fats and oils isomerized under optimum conditions and also under standard conditions were in good agreement. Constants are given for use when pentaene acids are present as well as for acids of less unsaturation.Spectroscopic evidence strongly indicates than pentaene acids are present in lard. More... »

PAGES

456-461

References to SciGraph publications

  • 1952-07. Standardization of spectrophotometric methods for determination of polyunsaturated fatty acids using pure natural acids in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1951-12. Isolation of eicosapentaenoic and docosapentaenoic acids from natural sources as their methyl esters by adsorption and distillation techniques in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1951-02. Isolation of natural arachidonic acid as its methyl ester 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
  • 1945-10. Spectrophotometric estimation of soybean oil in admixture with cottonseed and peanut oils in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1950-09. Kinetics of alkali isomerization of linoleic, linolenic, and arachidonic acids in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1945-06. Fatty acid analyses of known mixtures of purified methyl esters in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1949-06. Formation of traces of conjugated tetraenoic and trienoic constituents in autoxidized linolenic and linoleic acids and vegetable oils during alkali-isomerization in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1949-07. Isolation of pure natural linoleic and linolenic acids as their methyl esters by adsorption fractionation on silicic acid in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1949-08. Report of the Spectroscopy Committee in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
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    http://scigraph.springernature.com/pub.10.1007/bf02632628

    DOI

    http://dx.doi.org/10.1007/bf02632628

    DIMENSIONS

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