This report describes the electrochemical detection of a redox component in droplets using a local redox cycling-based electrochemical (LRC-EC) chip device consisting of 256 sensors. The time-course analyses showed that the redox compound in the droplet was dynamically changed during droplet evaporation or mass transfer through a water/oil interface.
We have previously reported a local redox cycling-based electrochemical (LRC-EC) system for the incorporation of many electrochemical sensors into a small chip device. In the present study, a new type of LRC-EC chip device was fabricated for the detection of a droplet array. To detect electrochemically redox compounds in droplets, Pt pseudo-reference/counter electrodes were incorporated into the individual sensors of the LRC-EC chip device. Cyclic voltammetry for the LRC-EC chip device with internal Pt pseudo-reference electrodes indicated well-defined voltammograms based on redox cycling for the individual sensor points. The device was successfully applied to the addressable detection of alkaline phosphatase (ALP) activity of HeLa cells in single droplets on the sensor points. Therefore, the LRC-EC chip device is considered to be a useful device for the bioanalysis of droplet systems.
Synthetic saponite containing a photosensitizing metal complex, tris(2,2'-bipyridine)ruthenium(II)), in the interlayer space was complexed with anatase nanoparticles to obtain transparent hybrid film photocatalyst. The catalyst film was mounted in a flow reactor device to catalyze such photocatalytic reactions as the decomposition of aqueous acetic acid and N-alkylation of benzylamine with ethanol.
Synthetic saponite containing a photosensitizing metal complex was complexed with colloidal anatase and used for the visible light photocatalytic reaction of aqueous benzene to phenol.
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