Journal of the American Oil Chemists’ Society

, Volume 73, Issue 11, pp 1567–1572 | Cite as

Synchrotron radiation X-ray diffraction study on phase behavior of PPP-POP binary mixtures

  • A. Minato
  • S. Ueno
  • J. Yano
  • Z. H. Wang
  • H. Seto
  • Y. Amemiya
  • K. Sato


The phase behavior of thesn-1,3-dipalmitoyl-2-oleoylglycerol (PPP-POP) binary mixture system was studied by powder X-ray diffraction with synchrotron radiation and by differential scanning calorimetry. The results showed that the immiscible phases were observed in metastable and in the most stable forms. In particular, synchrotron X-ray diffraction enabled us to reveal the monotectic nature of α as a kinetic phase behavior. The equilibrium phase diagram of the PPP-POP mixture is divided into two regions. In POP concentration ratios below 40%, solid-state transformation from α to β was observed, indicating that the α-β transition of PPP was promoted in the presence of POP. By contrast, the polymorphic transition proceeds from α to β through the occurrence of the intermediate β′ form at POP concentration ratios above 50%.

Key Words

Differential scanning calorimetry mixture phase behavior 2-oleodipalmitin polymorphism synchrotron radiation X-ray diffraction tripalmitin 


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Copyright information

© AOCS Press 1996

Authors and Affiliations

  • A. Minato
    • 1
  • S. Ueno
    • 1
  • J. Yano
    • 1
  • Z. H. Wang
    • 2
  • H. Seto
    • 3
  • Y. Amemiya
    • 4
  • K. Sato
    • 1
  1. 1.Faculty of Applied Biological ScienceHiroshima UniversityHigashi-HiroshimaJapan
  2. 2.Hei Long Jiang Commercial CollegePeople’s Republic of China
  3. 3.Faculty of Integrated Arts and SciencesHiroshima UniversityHigashi-HiroshimaJapan
  4. 4.National Laboratory for High-Energy PhysicsTsukubaJapan

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