Structural study on polymorphism of cis-unsaturated triacylglycerol: triolein

The Journal of Physical Chemistry. B
Chikayo AkitaFumitoshi Kaneko

Abstract

To clarify the influence of cis-unsaturation on solid-state structures of triacylglycerols (TAGs), the crystal structures of three crystalline phases (alpha, beta' and beta) of triolein [C3H5(OCOC17H33)3] were investigated by powder X-ray diffractometry and IR and Raman spectroscopy. The influence on the structural change of the alpha phase in the course of cooling was also studied. With respect to the subcell structure and conformational order of hydrocarbon chains in the beta and beta' phases, triolein resembles saturated TAGs; trans-zigzag hydrocarbon chains are adopted in the T(parallel) subcell for the beta phase and in the O(perpendicular) subcell for the beta' phase. The influence of cis-unsaturation was most obvious in the structure of the alpha phase and its temperature dependence. The alpha phase of triolein does not form the ordinary hexagonal subcell but a rather loose distorted subcell, which hardly changes in cooling, forming a striking contrast to the hexagonal-->pseudohexagonal subcell transformation found in the alpha phase of saturated TAGs.

References

Nov 10, 1966·Acta Crystallographica·L H Jensen, A J Mabis
Aug 1, 1996·Current Opinion in Structural Biology·I Pascher
Sep 8, 1998·Current Opinion in Structural Biology·F KanekoK Sato
May 4, 2000·Acta Crystallographica. Section B, Structural Science·C CulotF Durant
Jun 1, 1947·Journal of the American Chemical Society·R H FERGUSON, E S LUTTON

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Citations

Jul 31, 2008·Physical Chemistry Chemical Physics : PCCP·Eric Da Silva, Dérick Rousseau
Jul 15, 2009·Journal of Lipid Research·Ravi Kanth KamlekarMusti J Swamy
Dec 8, 2009·Chemistry and Physics of Lipids·Kirsi I PakkanenJohn Hjort Ipsen
Dec 6, 2008·Chemistry and Physics of Lipids·Eric Da SilvaDérick Rousseau
Nov 5, 2015·Reports on Progress in Physics·Thomas A Vilgis
Jul 12, 2013·The Journal of Physical Chemistry. B·Laura Bayés-GarcíaKiyotaka Sato

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