Electrochemical molecularly imprinted polymer sensors in viral diagnostics: Innovations, challenges and case studies

Molecularly imprinted polymers (MIPs) are synthetic equivalent of antibodies and have been widely used in electrochemical sensing as recognition elements. They offer advantages over traditional recognition elements such as antibodies, nucleic acids and aptamers due to their simple synthesis, lower production costs, greater chemical and physical stability, and robust performance in diverse environments. Improved detection techniques and combining MIPs with materials like metal nanoparticles, carbon nanotubes, aptamers, metal organic frameworks, quantum dots, and electrochemically active internal probes show increasing potential. These combinations could become a reliable method for detecting viruses quickly, with performance similar or better than standard techniques. In this review article we provide detailed case studies covering ten different viruses (Bean pod mottle virus, Dengue virus, Zika virus, Foot-and-mouth disease virus, Human papillomavirus, Hepatitis C virus, Human immunodeficiency virus, Influenza A virus, Norovirus, Severe acute respiratory syndrome coronavirus 2) and over forty specific examples. We summarize the recent advances in the development of electrochemical MIP-based sensors for the diagnostics of viral diseases and compare their performance. Additionally, challenges and future perspectives of MIPs as promising recognition elements are discussed.