Fe–CoS2/CC exhibits enhanced catalytic OER performance, needing an overpotential of 302 mV at 10 mA cm−2 in 1.0 M KOH.

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A novel “turn-on” fluorescent trypsin detection platform dependant on carbon dot-MnO2 (CD-MnO2) nanocomposites and ascorbic acid-loaded apoferritin (APOAA) was fabricated. The detection mechanism relied on trypsin-catalyzed enzymolysis of APOAA, which released ascorbic acid (AA) as a reducing agent to disintegrate the MnO2 nanosheets, causing the recovery of the fluorescence of CDs. An excellent performance and high sensitivity of trypsin determination were observed with a detection limit (LOD) of 0.3411 ng/mL. This work provides us with a unique strategy for trypsin detection in human serum samples, which reveals the potential applications in clinical detection.

The authors describe a novel method for the determination of glutathione (GSH). Detection is based on target induced release of glucose from MnO nanosheet-gated aminated mesoporous silica nanoparticles (MSNs). In detail, glucose is loaded into the pores of MSNs. Negatively charged MnO nanosheets are assembled on the MSNs through electrostatic interactions. The nanosheets are reduced by GSH, and this results in the release of glucose which is quantified by using a commercial electrochemical glucose meter. GSH can be quantified by this method in the 100 nM to 10 μM concentration range, with a 34 nM limit of detection. Graphical abstract Glucose is loaded into the pores of mesoporous silica nanoparticles (MSNs). MnO nanosheets are assembled on MSNs through electrostatic interactions. Glutathione (GSH) can reduce the nanosheets, and this results in the release of glucose which is quantified by using a commercial glucose meter.