Currently, microcapsules are attracting great attention and becoming more and more widely used in sustained release system. In this research, zein‐based microcapsules were prepared by anti‐solvent precipitation technology and spray drying. The properties of as‐prepared microcapsules were optimized by adjusting the reaction conditions and parameters such as the mass ratio of zein to vanillin, the drying temperature and whether polyethylene glycol was added or not. Meanwhile, the morphologies, chemical structures, and application performances of microcapsules were characterized and determined by SEM, FT‐IR, TG, and so on. The results showed that the morphology of as‐obtained microcapsules was a regular spherical shape with no cracks when the mass ratio of zein to vanillin was 1:1, the inlet temperature was 120 C and the polyethylene glycol was introduced. Meanwhile, it was also proved that the polyethylene glycol has a positive effect on the encapsulation efficiency in microcapsules. Moreover, zein microcapsules can effectively improve the thermal stability and release behavior of vanillin, meanwhile the exist of polyethylene glycol can further improve the properties of zein microcapsules. This research provided guidelines for the study of microcapsules.
In order to further enhance the application eld of zein-based microcapsule. Zein-based amorphous TiO 2 composite microcapsules (ZTCMs) were innovatively prepared from zein, tetra butyl ortho titanate (TBOT) and PEO 106 PPO 70 PEO 106 (F127) via interface template synthesis. The Effects of TBOT amount on ZTCMs structures and photo-catalytic performances were mainly investigated. Chemical structure and microstructure of the obtained composite microcapsules were characterized mainly by fourier-transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), scanning electron microscope (SEM) and energy disperse spectroscopy (EDS). The results show ZTCMs exhibited evident hollow structure with titanium dioxide (TiO 2 ) wrapped in the outer layer. The average size of ZTCMs 300 was approximately 4 µm, which increased as the increase of TBOT dosage. Signi cantly, ZTCMs showed excellent photo-catalytic ability on dyes, red wine and coffee alike. The degradation rate of Rhodamine B (RB) was more than 80% after irradiation for 5 h under sunlight. This study provides a facile method to fabricate natural-based photo-catalytic material, which will be a good candidate in many elds such as medicine, food packaging, leather and textile.
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