An Aptasensing Strategy Using the Phosphatase-mimic Nanozyme and pH Meter as Signal Readout

The demand for point-of-care testing (POCT) is growing dramatically, especially for district where health facilities are poorly staffed, poorly skilled and ill-equipped. As a commercialized portable device, pH meters can be used for detection of various targets, relying on bioactive enzymes. The nanozymes, as the alternative of the natural enzymes, have rarely been used for pH-metric POCT strategies. Herein, we developed an ultrasensitive pH-metric sandwich-type aptasensor based on the CeO2 nanorods (CeO2 NRs) as phosphatase-mimic and sodium monofluorophosphate (MFP) as catalytic substrate. Under optimal conditions, such strategy yields a detection limit of 1.17 nM with eligible selectivity for detecting thrombin.

Automated summary

In this study, an ultrasensitive pH-metric sandwich-type aptasensor was developed using CeO2 nanorods and MFP for detecting thrombin, showing eligible selectivity and detection limit of 1.17 nM.