Abstract
Bisphenol A (BPA) as the most common endocrine disruptor used in food containers and packaging is causing adverse effects for human beings. Accordingly, in situ detection of BPA is of practical importance for food safety. However, the complicated operations of existed methods and interference of various impurities in food matrix restrict the realization of real-time in situ BPA sensing in food samples. We report here a portable and fully-integrated electrochemical sensing device with an injector as the reaction vessel which assembled with screen printed electrodes (SPEs) as sensing electrodes and a detachable filter unit to filter impurities. This device, namely lab-on-injector, reduces the sampling, pretreatment and detection to a simple on-step operation, making in situ detection of BPA in real samples much easier and more feasible. Moreover, extra-small Au nanodots confined in carbon nanofibers ([email protected]) were synthesized by in situ carbothermic reduction of Au3+ absorbed on cellulose, and were used to modified SPEs surface to greatly enhance detection performance of the lab-on-injector. Using this [email protected] based lab-on-injector, BPA in food matrix was detected directly with recoveries from 93.14% to 94.25%, demonstrating a reliable platform for in situ detection of BPA, and opening a new way for the development of smart devices in electroanalysis.
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