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.

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The COVID-19 (Corona Virus) is an intensely rising virus that has intentioned countries to utilize technologies to identify Covid disease. Several countries are working incredibly to battle against COVID-19. Numerous countries have been utilizing a range of gadgets to contest the pandemic, looking for data about growth, perceiving as well as the emancipating the personal data of the inhabitants. In the present situation of COVID-19 (Corona Virus) legislative institutes all around the world make an effort to build a monitoring system that notifies about declared cases throughout the world. Several Researcher suggested IoT and Blockchain-based applications for this reason. The significant thought behind a IoT and Blockchain-based system for monitoring is quality services, information handling and prevent from Single Point of Failure. Even now , it raises various issues concerning to Security Issues, Legal Disputes, Privacy Requirements, Latency, Throughput, Scalability, Intense Traffic and Block Size. This article aims to discuss these IoT and Blockchain-based applications Challenges.