Design and Development of Portable Potentiostat for Advanced Research in Electrochemical Biosensing

Embedded system based, portable potentiostat for Linear Sweep Voltammetry(LSV) is successfully developed. The uniqueness of the system is that it is developed by using off the shelf components for high performance, high resolution and low cost three electrode electrochemical biosensor. It is interfaced with PC by USB. Most important parameters that need to set in electrochemical analysis are scan rate, start potential, end potential and step size of linear sweep voltage. In this system, external 16-bit DAC and 24-bit ADC are interfaced which gives the LSV resolution of 763nV and can capture minimum sensor current of 125nA. This kind of signal resolution is needed for detection of low analyte concentration. Most importantly the system does not need any external memory to store the captured sensor data. An employment of cool term software aids the real-time data capture from biosensor and save it in .txt file format for further parameter estimation.