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Physical Properties, Microstructure, Intermolecular Forces, and Oxidation Stability of Soybean Oil Oleogels Structured by Different Cellulose Ethers

Meng, Zong, Qi, Keyu, Guo, Ying, Wang, Yong, Liu, Yuanfa
European journal of lipid science and technology 2018 v.120 no.6 pp. e1700287
Fourier transform infrared spectroscopy, X-ray diffraction, additives, binding capacity, dietary fiber, droplets, drying, emulsions, ethers, fatty acids, human health, hydrogen bonding, light microscopy, methylcellulose, microstructure, oil-water interface, oxidative stability, polymerization, scanning electron microscopy, soybean oil, strength (mechanics), viscosity, xanthan gum
Edible oleogels are prepared by different kinds of hydroxypropyl methyl cellulose (HPMC) and methylcellulose (MC) through emulsion‐templated method. Physical properties of the oleogels such as rheological behavior and oil binding capacity are evaluated. Polarizing light microscopy (PLM) as well as scanning electron microscopy (SEM) are used to gain information on the microstructure of the samples. Fourier transform infrared spectroscopy (FTIR), and X‐ray diffraction (XRD) are used to evaluate intermolecular forces between the polysaccharides in the oleogels. It is found that oil‐water interface layers of the emulsions are strengthened by polysaccharides (HPMC and xanthan gum [XG] or MC and XG), and it prohibits oil droplets from coalescing during drying. The formation of semi‐crystalline structure of oleogels to trap the oil is attributed to intramolecular/intermolecular hydrogen bonding between the polysaccharides. The higher viscosity grade results in better structure with respect to emulsions, vacuum dried emulsions, and oleogels compared to that of lower viscosity grade for HPMC or MC. The mechanical strengths of vacuum dried emulsions and oleogels stabilized by HPMC are harder compared to that of MC. The study will provide guidance for the production of functional fat products with zero trans and low saturated fatty acids. Practical Applications: HPMC and MC, two types of dietary fiber, are two kinds of the most commonly used cellulose ethers which are food‐approved additives. The oleogels prepared by HPMC and MC using an emulsion‐templated method can be used to produce functional fat products with zero trans and low saturated fatty acids, which will be beneficial to human health. The properties of oleogels structured by different HPMC and MC with the different degree of polymerization (DP) and substitution (DS) are different. The physical properties, microstructure, and intermolecular forces for oleogels are evaluated in order to lay the basis for the application of the oleogels. A schematic representation of the structure of oleogels stabilized by hydroxypropyl methyl cellulose (HPMC) and xanthan gum (XG).