J. Lipid Res.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Yano, J.
Right arrow Articles by Kodali, D. R.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Yano, J.
Right arrow Articles by Kodali, D. R.
Social Bookmarking
Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati  
What's this?

The Journal of Lipid Research, Vol. 40, 140-151, January 1999
Copyright © 1999 by Lipid Research, Inc.

Original Article

Structural analyses of polymorphic transitions of sn -1,3-distearoyl-2-oleoylglycerol (SOS) and sn -1,3-dioleoyl-2-stearoylglycerol (OSO): assessment on steric hindrance of unsaturated and saturated acyl chain interactions

Junko Yanoa, Kiyotaka Satoa, Fumitoshi Kanekob, Donald M. Smallc, and Dharma R. Kodalid
a Faculty of Applied Biological Science, Hiroshima University, Higashi-Hiroshima, 739-8528 Japan
b Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, 560-0043 Japan
c Department of Biophysics, Housman Medical Research Center, Boston, MA 02118
d Central Research, Cargill Inc., Minneapolis, MN 55440-5699

Correspondence to: Junko Yano

Polymorphic transformations in two saturated-unsaturated mixed acid triacylglycerols, SOS (sn -1,3-distearoyl-2-oleoylglycerol) and OSO (sn -1,3-dioleoyl-2-stearoylglycerol), have been studied by FT-IR spectroscopy using deuterated specimens in which stearoyl chains are fully deuterated. A reversible phase transition between sub {alpha} and {alpha} and a series of irreversible transitions ({alpha}->{gamma}->ß'->ß (ß2, ß1) for SOS and {alpha}->ß'->ß for OSO) were studied with an emphasis on the conformational ordering process of stearoyl and oleoyl chains. The {alpha}->sub {alpha} reversible transition was due to the orientational change of stearoyl chains in the lateral directions from the hexagonal subcell to a perpendicularly packed one. As the first stage of the series of irreversible transitions from {alpha} to ß, the conformational ordering of saturated chains took place in the {alpha}->{gamma} transition of SOS and in the {alpha}->ß' transition of OSO; one stearoyl chain in SOS and OSO takes the all-trans conformation and the second stearoyl chain in SOS takes the bent conformation like those observed in the most stable ß-type. As the final stage, the ordering of unsaturated chains occurred in the ß'->ß transition both for SOS and OSO. A conversion in the layered structure from bilayer to trilayer was also accompanied by the conformational ordering in the {alpha}->{gamma} transition of SOS and in the ß'->ß transition of OSO.—Yano, J., K. Sato, F. Kaneko, D. M. Small, and D. R. Kodali. Structural analyses of polymorphic transitions of sn -1,3-distearoyl-2-oleoylglycerol (SOS) and sn-1,3-dioleoyl-2-stearoylglycerol (OSO): assessment on steric hindrance of unsaturated and saturated acyl chain interactions. J. Lipid Res. 1999. 40: 140–151.

Supplementary key words: polymorphism, phase behavior, infrared spectroscopy, molecular packing, molecular conformation, deuteration


Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati    What's this?




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
 All ASBMB Journals   Journal of Biological Chemistry 
 Molecular and Cellular Proteomics   ASBMB Today 
Copyright © 1999 by the American Society for Biochemistry and Molecular Biology.