Thermal and structural properties of sn-1,3-dipalmitoyl-2-oleoylglycerol and sn-1,3-dioleoyl-2-palmitoylglycerol binary mixtures examined with synchrotron radiation X-ray diffraction |
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| Authors: | A Minato S Ueno J Yano K Smith H Seto Y Amemiya K Sato |
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| Affiliation: | (1) Faculty of Applied Biological Science, Hiroshima University, 739 Higashi-Hiroshima, Japan;(2) Colworth Laboratory, Unilever Research, MK44 1LQ Bedford, United Kingdom;(3) Faculty of Integrated Arts and Science, Hiroshima University, 739 Higashi-Hiroshima, Japan;(4) Faculty of Engineering, University of Tokyo, Bunkyo-ku, 113 Tokyo, Japan |
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| Abstract: | Thermodynamic and polymorphic behavior of POP (sn-1,3-dipalmitoyl-2-oleoylglycerol) and OPO (sn-1,3-dioleoyl-2-palmitoylglycerol) binary mixtures was examined using differential scanning calorimetry and conventional and
synchrotron radiation X-ray diffraction. A molecular compound, βC, was formed at the 1:1 (w/w) concentration ratio of POP and OPO, giving rise to two monotectic phases of POP/compound and
compound/OPO in juxtaposition. βC has a long-spacing value of 4.2 nm with a double chainlength structure and the melting point of 31.9°C. A structural model
of the POP-OPO compound is proposed, involving the separation of palmitoyl and oleoyl chain leaflets in the double chainlength
structure. In the polymorphic occurrence of the POP-OPO mixtures, the POP fraction transformed from α to β′ with no passage
through γ, then transformed to β. The presence of OPO in POP promoted the β′-β transformation of POP during the melt-mediated
crystallization. |
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| Keywords: | Binary mixture differential scanning calorimetry phase behavior polymorphism synchrotron radiation X-ray diffraction triacylglycerol |
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