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Phytosterols and γ-Oryzanol as Cholesterol Solid Phase Modifiers during Digestion.

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Phytosterols and γ-oryzanol form solid solutions and liquid crystals with cholesterol, potentially lowering cholesterol absorption during digestion. This study explores their thermodynamic interactions and in vitro digestibility.

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Area of Science:

  • Nutritional Science
  • Food Chemistry
  • Thermodynamics

Background:

  • Dietary phytosterols and γ-oryzanol are known to lower cholesterol levels.
  • Thermodynamic principles may explain cholesterol-lowering mechanisms during digestion.

Purpose of the Study:

  • To elucidate the solid-liquid phase equilibrium diagrams of cholesterol with phytosterols and γ-oryzanol.
  • To evaluate the impact of these compounds on cholesterol's physical state and digestibility.

Main Methods:

  • Differential scanning calorimetry (DSC) for phase equilibria.
  • Powder X-ray diffraction and microscopy for structural analysis.
  • Thermodynamic modeling and in vitro digestibility assays.

Main Results:

  • Cholesterol and phytosterols formed complete solid solutions.
  • Cholesterol and γ-oryzanol formed stable liquid crystalline phases with reduced melting points.
  • In vitro digestion supported phase changes influencing cholesterol solubility.

Conclusions:

  • Phytosterols and γ-oryzanol induce physical changes in cholesterol.
  • These changes, potentially driven by mechanochemical forces during digestion, may reduce cholesterol absorption.