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Analyses of mixtures of t,tΔ9,11‐ and t,tΔ10,12‐linoleic acids by X‐ray diffraction patterns and solidification points
Author(s) -
Witnauer Lee P.,
Nichols Peter L.,
Senti Frederic R.
Publication year - 1949
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/bf02651506
Subject(s) - diffraction , composition (language) , crystallography , x ray crystallography , x ray , chemistry , materials science , physics , optics , philosophy , linguistics
Summary X‐ray diffraction and solidification point data are reported for t,tΔ9,11‐ and t,tΔ10,12‐linoleic acids and their mixtures. The long spacing of the Δ9,11‐isomer was 47.95 Å whereas that of the Δ10,12‐isomer was 44.09 Å. X‐ray diffraction patterns of binary mixtures showed the characteristic pattern of each isomer if the mixture contained not less than 25% of the t,tΔ10,12‐isomer or not less than 5% of the t,tΔ9,11‐isomer. Outside these composition limits only the pattern of the predominant isomer appeared, and solidification point data were used to define the composition. The solidification point in conjunction with the X‐ray data defined the composition of any mixture to ±3%.