A tyrosinase-immobilized biosensor was developed based on various amine-modified multi-walled carbon nanotube (MWNT) supports for the detection of phenolic compounds. MWNTs with various amine groups were prepared by radiation-induced graft polymerization of glycidyl methacrylate (GMA) onto MWNT supports and the subsequent amination of poly(GMA) graft chains. The physical and chemical properties of the poly(GMA)-grafted MWNT supports and the aminated MWNT supports were investigated by SEM, XPS, and TGA. Furthermore, the electrochemical properties of the prepared tyrosinase-modified biosensor based on MWNT supports with amine groups were also investigated. The response of the enzymatic biosensor was in the range of 0.1-0.9 mM for the concentration of phenol in a phosphate buffer solution. Various parameters influencing biosensor performance have been optimized: binder effects, pH, temperature, and the response to various phenolic compounds. The biosensor was tested on phenolic compounds contained in two different commercial red wines.

Respiratory tract infections caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) originating from China began in late 2019 and became prevalent worldwide in early 2020. Korea was one of the closest countries to China and was forced to go through this pandemic. In the absence of vaccines or effective antiviral drugs, we have no choice but to re-use the old preventive measures used by humans in the past. In this review, I would like to discuss the preventive measures used in Korea during the pandemic.

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