Disposable Sensor for Organophosphorus Pesticides

摘要

This work demonstrates the potential for application of potentiometric enzyme electrodes based on mediatorless enzyme electrocatalysis for fast and sensitive assay of organophosphorus pesticides. The sensing element based on screen-printed carbon material permits mass fabrication of the sensing elements at low cost which is essential for the disposable sensor concept. The electrode does not require any low-molecular weight mediator and can be arranged as an 'all-solid-state' sensor. Such electrodes, being based on a potentiometric principle, are suitable for miniaturization and arrangement in multi-sensor array for simultaneous determination of several analytes in real samples This work demonstrates the optimization of the assay parameters: it establishes the optimal pH and temperature rang for maximal electrode response. Further studies will involve investigation of the sensors shelf life at different temperature and extension to a number of OPCs analytes including common pesticide samples.