A portability self-powered sensor facilitates sensitive Cd detection: Dual mechanism and three quantitative mode.

As a common heavy metal contaminant, Cd has adverse effects on food safety and consumer health. It is very important for human health to realize highly sensitive Cd detection methods. The self-powered sensing system based on enzyme biofuel cells (EBFCs) does not need an external power supply, which can simplify the experimental equipment and has great application value in portable detection. Thus, the biosensor is innovatively integrated into the screen-printed electrode to construct a new type of portable sensor suitable for on-site and real-time Cd detection. Hybridization chain reaction (HCR) combined with the Cd-dependent deoxyribose (DNAzyme) signal amplification strategy is used to enhance the detection sensitivity while specifically recognizing the Cd. Moreover, the self-powered sensor combines with smartphones to realize quantitative Cd detection without other instruments and has the characteristic of Effectively improving the hazard detection technology is essential to ensure food safety. Portability, simplicity, and speed are suitable for real-time Cd detection in the field. The dual mechanism and three quantitative modes combining colorimetric and two electrical signals output modes are adopted to realize the visualization and accurate detection. A series of research results confirm that this strategy is of great significance to strengthen the development of intelligent Cd technology, expand the application of self-powered sensing technology, and improve the safety detection system.