This chapter reviews the results that have been obtained over the last few years on the self-assembling mixtures of sitosterol and oryzanol in edible oil and in emulsions. The structuring system based on mixtures of a plant sterol and a plant sterol ester, β-sitosterol and γ-oryzanol, seems to emerge among the most interesting system. The present chapter provides a comprehensive review of this system and a number of very closely related systems. It starts with the description of the single components and continues with the kinetics and structure of the self-assembled structures, followed by the rheology of (water-free) oleogels. The behavior of this type of structuring in the presence of water and several potential applications of the oryzanol + sterol mixture are subsequently discussed.
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