Premium
Identification of fatty acid polymorphic modifications by infrared spectroscopy
Author(s) -
Mitcham D.,
Bailey A. V.,
Tripp V. W.
Publication year - 1973
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/bf02639851
Subject(s) - degree of unsaturation , elaidic acid , infrared spectroscopy , carbon chain , carbon fibers , chemistry , infrared , spectral line , cis–trans isomerism , crystal (programming language) , spectroscopy , fatty acid , crystallography , stereochemistry , organic chemistry , materials science , optics , physics , quantum mechanics , astronomy , composite number , computer science , linoleic acid , composite material , programming language
IR spectra in the 7.5–25.0 μ region are shown to be unique for the individual long chain odd carbon numbered saturated fatty acids and for the monounsaturated even carbon numbered fatty acids, their isomers, and polymorphic modifications. IR spectra are presented which illustrate similarites and dissimilarities resulting from chain length differences and polymorphic variations for monounsaturated acids. X‐ray crystal long spacings for the saturated odd carbon numbered acids are compared with literature values. X‐ray crystal long spacings for monounsaturated trans acids are shown to be related to carbon chain length and independent of the location of unsaturation. Diffractograms and IR spectra of the 2 polymorphic modifications of elaidic acids are presented. IR spectra illustrating band differences for cis and trans isomers are shown.