Comparative study of thermal stability of magnetostrictive biosensor between two kinds of biorecognition elements

A Review of Piezoelectric and Magnetostrictive Biosensor Materials for Detection of COVID-19 and Other Viruses

The spread of the severe acute respiratory syndrome coronavirus has changed the lives of people around the world with a huge impact on economies and societies. The development of wearable sensors that can continuously monitor the environment for viruses may become an important research area. Here, the state of the art of research on biosensor materials for virus detection is reviewed. A general description of the principles for virus detection is included, along with a critique of the experimental work dedicated to various virus sensors, and a summary of their detection limitations. The piezoelectric sensors used for the detection of human papilloma, vaccinia, dengue, Ebola, influenza A, human immunodeficiency, and hepatitis B viruses are examined in the first section; then the second part deals with magnetostrictive sensors for the detection of bacterial spores, proteins, and classical swine fever. In addition, progress related to early detection of COVID-19 (coronavirus disease 2019) is discussed in the final section, where remaining challenges in the field are also identified. It is believed that this review will guide material researchers in their future work of developing smart biosensors, which can further improve detection sensitivity in monitoring currently known and future virus threats.

Determination of stability characteristics for electrochemical biosensors via thermally accelerated ageing

Biosensors are devices that are prone to ageing; this phenomenon can be characterized as a decrease in signal over time. Biosensor stability is of a crucial importance for commercial success and as biosensors are presently being applied to an increasing and variety of applications. Stability characteristics related to shelf life, reusability and/or continuous use stability are often poorly investigated or unreported in literature, yet are important factors. Instability or ageing can be accelerated at an elevated temperature; Arrhenius (exponential) and linear models were investigated in order to propose a novel method for rapid ageing characteristics determination. Linear correlation proved more suitable with higher coefficients of determination than exponential correlation. Degradation rate is linearly dependent on temperature and by utilizing the proposed models, long term shelf life of a biosensor can be determined in 4 days and continuous use stability in less than 24h. Reusability studies are found to correlate poorly due to the unpredictable nature of biosensor handling. Basic constructed screen printed electrode glucose oxidase biosensors were used as a model biosensor in order to propose models for shelf life, reusability and continuous use stability.