The Phase Behavior of γ-Oryzanol and β-Sitosterol in Edible Oil

H.I.M. Sawalha*, P. Venema, A. Bot, E. Flöter, R. den Adel, E. van der Linden

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

33 Citations (Scopus)

Abstract

The phase behavior of binary mixtures of ¿-oryzanol and ß-sitosterol and ternary mixtures of ¿-oryzanol and ß-sitosterol in sunflower oil was studied. Binary mixtures of ¿-oryzanol and ß-sitosterol show double-eutectic behavior. Complex phase behavior with two intermediate mixed solid phases was derived from differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS) data, in which a compound that consists of ¿-oryzanol and ß-sitosterol molecules at a specific ratio can be formed. SAXS shows that the organization of ¿-oryzanol and ß-sitosterol in the mixed phases is different from the structure of tubules in ternary systems. Ternary mixtures including sunflower oil do not show a sudden structural transition from the compound to a tubule, but a gradual transition occurs as ¿-oryzanol and ß-sitosterol are diluted in edible oil. The same behavior is observed when melting binary mixtures of ¿-oryzanol and ß-sitosterol at higher temperatures. This indicates the feasibility of having an organogelling agent in dynamic exchange between solid and liquid phase, which is an essential feature of triglyceride networks.
Original languageEnglish
Pages (from-to)1651-1659
JournalJournal of the American Oil Chemists Society
Volume92
Issue number11
DOIs
Publication statusPublished - 2015

Keywords

  • DSC
  • Eutectic point
  • Oleogel
  • Organogel
  • Phase behavior
  • Phase diagram
  • SAXS
  • Solidification
  • Tubule
  • β-Sitosterol
  • γ-Oryzanol

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