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Application of near infrared spectrophotometry to the study of the autoxidation products of fats
Author(s) -
Slover Hal T.,
Dugan L. R.
Publication year - 1958
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/bf02640550
Subject(s) - chemistry , autoxidation , absorbance , peroxide , infrared spectroscopy , alcohol , spectrophotometry , peroxide value , organic chemistry , infrared , bicarbonate , infrared spectrophotometry , photochemistry , chromatography , physics , optics
Summary The usefulness and limitations of near infrared spectroscopy as applied to the oxygenated products of fat oxidation has been studied. Hydroperoxides, acids, alcohols, esters, aldehydes, and ketones all absorb in the narrow range from 2,700 mμ to 3,000 mμ. Alcohols may be distinguished from hydroperoxides and acids, but the latter are too close together to be resolved. In mixtures all the C=O absorptions attributable to esters, aldehydes, and ketones combine to form one band. In autoxidizing methyl oleate, the increase in alcohol, carbonyl, and combined acid‐hydroperoxide can be followed in the near infrared spectra of CCl 4 solutions. In the absence of acid the increase in hydroperoxide absorbance is linear with peroxide value. The changes in the spectra of a reduced and bicarbonate‐washed sample of oxidized methyl oleate correlate well with the expected chemical changes.