This study aimed to construct zeolite/chitosan-based magnetic microparticles (MMPs) using ZSM-5 zeolite, Fe3O4, and chitosan with incorporated Ligustrum robustum (Rxob.) Blume polyphenol extract (LRE) for oil quality control. Magnetic characterization and X-ray diffraction analysis demonstrated that the obtained MMPs had a saturation magnetization of 12.07 emu/g and showed magnetic separation ability due to the presence of ferric oxide crystals. Meanwhile, MMPs exhibited good resistance against heating and had a uniform structure with an intermediate diameter of 125.79 μm. Furthermore, scanning electron microscopy and sustained-release analysis indicated that MMPs could well embed LRE and slowly release LRE in weakly polar solvents. Finally, the oil protection experiments demonstrated that MMPs could inhibit the quality deterioration of peanut oils during the frying process and show good recyclability. The findings provide promise for using magnetic microparticles in oil quality control during high-temperature processing in agriculture and food industries.
The low solubility of phenolic compounds in oils limits their protective effect on oil quality. In the present study, novel microemulsions were designed and prepared with Ligustrum robustum (Rxob.) Blume polyphenols extract (LRE) using soybean oil as the oil phase, a combination of Tween80 and Span80 as surfactants, and ethanol as the co-surfactant, and subsequently characterized and evaluated their properties and performance in oil. Results showed that the amount of LRE dissolved in prepared microemulsions could reach 0.025 g/g oil. According to the droplet size, rheology, differential scanning calorimetry, and transmission electron microscopy measurements, LRE had no negative effects on microemulsion structure and increased the particle size, viscosity, and interfacial strength of microemulsion. Moreover, LRE exhibited remarkable antioxidant activities, and the LRE-loaded microemulsions showed no obvious cytotoxicity on Caco-2 cells. Furthermore, the LRE-loaded microemulsions exhibited superior effectiveness in inhibiting oil oxidation during storage, compared to the direct addition of LRE. All results suggest that the microemulsion has the potential used as an embedded material for natural antioxidants in food industry.
危险品化学品经营许可证（带存储）