Enzyme-free impedimetric biosensor-based molecularly imprinted polymer for selective determination of L-hydroxyproline

An innovative wireless electrochemical card sensor for field-deployable diagnostics of Hepatitis B surface antigen

“…S1. The characteristic bands of the carbon-based electrode (red line) including C-O stretching at 1025 cm −1 and C=O stretching at 1517 cm −1 were observed on unmodified SPCE 34 . These bands belong to a carboxylic functional group of esters on the carbon surface.…”

Single-step electropolymerization on a printed sensor towards a conductive thin film polymer for the simultaneous determination of drug metabolites: 5-aminosalicylic acid and sulfapyridine

“…S3b,† the R ct values were found to be 5.559 and 2.286 kΩ for the SPGE and poly( l -Met)/SPGE, respectively. Furthermore, the apparent electron-transfer rate constant ( k app ) was calculated as follows: 23,24 where R denotes the universal gas constant (8.31447 J K −1 mol −1 ); T denotes the absolute temperature (298 K); n denotes the number of electrons transferred during the redox reaction; F denotes Faraday's constant (96 485 C mol −1 ); A denotes the surface area of the electrode (cm 2 ); R ct denotes the charge transfer resistance (Ω); and C denotes the concentration of [Fe(CN) 6 ] 3−/4− (5.0 × 10 −6 mol cm −3 ). From the calculation, the k app values were 1.496 × 10 −4 and 3.424 × 10 −4 cm s −1 for the SPGE and poly( l -Met)/SPGE, respectively.…”

“…S3b, † the R ct values were found to be 5.559 and 2.286 kΩ for the SPGE and poly(L-Met)/SPGE, respectively. Furthermore, the apparent electron-transfer rate constant (k app ) was calculated as follows: 23,24…”

Label free electrochemical DNA biosensor for COVID-19 diagnosis

“…Electrochemical detection can be performed in a reagent-free format, providing user-friendly operation for a variety of protein and nucleic acid analytes [ 25 ]. The reagent-free-based biosensor relies on the target-induced conformational change that triggers a change in the electrochemical response either of the DNA bases or of a redox active indicator such as methylene blue (MB) [ 26 , 27 ], [Ru (NH3) 6 ] 3+ [ 28 , 29 ] and [Fe(CN) 6 ] 3−/4− [ 30 , 31 ].…”