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Determination of cis unsaturation in oils by near infrared spectroscopy
Author(s) -
Fenton A. J.,
Crisler R. O.
Publication year - 1959
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/bf02640270
Subject(s) - degree of unsaturation , molar absorptivity , absorbance , chemistry , infrared spectroscopy , absorption (acoustics) , spectroscopy , analytical chemistry (journal) , infrared , near infrared spectroscopy , organic chemistry , chromatography , materials science , optics , physics , quantum mechanics , composite material
Conclusion An analytical method has been developed capable of giving reproducible and accurate determinations of the cis unsaturation present in refined oils, hydrogenated oils, and finished shortenings. Molar absorptivity measurements indicate that similar methods are applicable to the analyses of mixed esters or fatty acids. The method depends upon the measurement of a band in the near infrared at 2.143 μ that is caused by cis unsaturation. The following pertinent conclusions are drawn from data obtained in this investigation.The areas under the absorption bands for cis polyenes are integral multiples of the areas under the bands of cis monoenes. The cis content of oils containing less than 10% trans triglycerides can be determined accurately by measuring the area under the absorption band. Accurate results can be obtained for samples containing quantities of trans fatty acids in excess of 10% if a point baseline is used and the peak absorbance measured.