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Limitations of periodate‐permanganate oxidation in determination of glyceride composition: Nonquantitative oxidation and hydrolysis of azelaoglycerides
Author(s) -
Kaimal T. N. B.,
Lakshminarayana Gollamudi
Publication year - 1970
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02638868
Subject(s) - glyceride , permanganate , chemistry , periodate , hydrolysis , triolein , reagent , chromatography , organic chemistry , oleic acid , fatty acid , biochemistry , lipase , enzyme
Oleic acid, methyl oleate, mono‐ and diunsaturated triglyceride concentrates, triolein, Garcinia indica fat and saffower oil were oxidized with periodate‐permanganate reagent in aqueous 60% tert ‐butanol at 80 C (reflux temperature), 65 C and 28 to 30 C under different conditions. Significant proportions of unoxidized and partially oxidized compounds, mainly ketohydroxy compounds, were found in oxidation products. Hydrolysis of azelaoglycerides, particularly triazelain also occurred. The di‐ and trisaturated glyceride contents are therefore likely to be higher than the actual for all fats when determined by Youngs and Subbaram's method and for fats containing high proportions of triunsaturated glycerides by Youngs' method.