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High-pressure Sapphire Cell for Phase Equilibria Measurements of CO2/Organic/Water Systems
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Mixed State Diagrams of Rice Starch/glycerol/water Ternary Systems
Kaya Torii1, Yota Oda2, Atsuro Takahashi2
1Department of Applied Chemical Engineering and Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, Jonan, Yonezawa, Yamagata 4-3-16, 992-8510, JAPAN.
Journal of Oleo Science
|April 1, 2026
Summary
Amorphous rice starch shows enhanced water adsorption due to more hydroxyl groups. Adding glycerol expands the stable
Area of Science:
- Food Science
- Materials Science
- Biochemistry
Background:
- Amorphous rice starch/glycerol/water systems are vital in food, cosmetics, and functional materials.
- Understanding their water adsorption and mixed states is crucial for product development.
Purpose of the Study:
- To investigate the water adsorption of crystalline and amorphous rice starches.
- To analyze the mixed state of rice starch/glycerol/water ternary systems.
- To evaluate the impact of amorphization on these systems.
Main Methods:
- Thermogravimetric analysis (TGA) to assess thermal properties.
- Wide-angle X-ray diffraction (XRD) to determine structural changes.
- Analysis of water adsorption and mixed states (funicular and capillary).
Main Results:
- Amorphous rice starch exhibits greater water affinity due to increased free hydroxyl groups.
- Amorphous systems showed a higher water evaporation temperature (14 °C increase).
- Glycerol addition expanded the funicular region in amorphous rice starch systems, enhancing adhesion and viscosity.
Conclusions:
- Amorphization significantly enhances water adsorption in rice starch systems.
- Glycerol's hydroxyl groups improve starch particle adhesion and system viscosity.
- Findings aid in formulating products using rice starch and glycerol mixtures.
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