Boron-doped diamond sensors have been proposed to measure the concentration of various substances by taking advantage of the characteristics of a wide potential window and a small electric double-layer capacitance current. In addition, we also report the measurement of dissolved ozone concentration. The previous sensor had disadvantages in that the measurement part was large and required management owing to using an Ag/AgCl electrode with a glass body. We have developed a tiny sensor with stable sensitivity by mounting three diamond electrodes on the surface. This diamond sensor has slight individual differences in dissolved ozone concentration, high repeatability, and the capability to measure from low concentrations. We propose that this sensor is suitable for mass production and can easily measure ozone water concentration anywhere.

View full abstract

Simple and convenient allergen removal method from food preparation equipment is required. We carried out a model experiment using strongly acidic hypochlorous acid water in order to examine its capability of removing egg white as a typical allergen from food preparation equipment. Circular stainless plates with 3cm diameter were spread with 50µL of 10 times diluted egg white preparation, air-dried for 45 min. and then added with 1 mL of strongly acidic hypochlorous acid water for 20 sec. Subsequently, the plate surface was wiped off five times in the linear direction followed by four times in the circumferential direction using a sterilized gauze supplemented with 2 mL of strongly acidic hypochlorous acid water. It turned out that allergen was markedly removed when evaluated by immunochromatography with 25ng/mL of sensitivity. However, no significant reduction was observed by ELISA.

View full abstract