Microflow Vessel Improving Reproducibility and Sensitivity of Electrochemical Measurements

A new microflow system was designed and developed for electrochemical measurements. The electrochemical electrodes prepared using thick film technology were used in this arrangement. Results of various measurements such as simple amperometric measurement on the example of H2O2 detection, measurement with glucose oxidase (GOx) biosensor, soluble enzyme activity measurement etc. carried out using this system are reported. It was observed that the sensitivity and reproducibility of the electrochemical measurements is improved significantly. The new device performance was proved on H2O2 detection, activity of GOx measurement and heavy metals detection (measured concentration range: H2O2 10−9 to 10−1 M, glucose 10−6 to 10−2 M, activity of GOx 10−1 to 102 IU, heavy metals (Cu, Pb) 10−4 to 10−3 M). The microflow insert greatly reduces the overall size of the electrolyte vessel and measurements with sample quantity as low as 2 mL can be accomplished.