One-step and real-time detection of Hg in brown rice flour using a biosensor integrated with AC electrothermal enrichment.

Mercury (Hg) is one of the most toxic heavy metals in farm products, so rapid detection of trace Hg has always been sought after with high interest. Herein, we report a biosensor to specifically recognize Hg in leaching solutions of brown rice flour. This sensor is simple and of low cost, with a very short assay time of 30 s.

Real-time, selective, and low-cost detection of trace level SARS-CoV-2 spike-protein for cold-chain food quarantine.

Due to the friendly temperature for virus survival, SARS-CoV-2 is frequently found in cold-chain foods, posing a serious threat to public health. Utilizing an interdigitated microelectrode chip modified with an antibody probe and integrating dielectrophoresis enrichment with interfacial capacitance sensing, a strategy is presented for the detection of trace level spike-protein from SARS-CoV-2. It achieves a limit of detection as low as 2.