皮膚pH計測用乾式センサシステムの開発 ―乾式測定手法の検討―

抄録

It is a well-known fact that the skin surface pH has weak acid. Recent many studies have shown that skin barrier role and atopic dermatitis (AD) related to the skin surface pH. The final goal of this study is to develop a multifunctional skin measurement system for portable use, to evaluate data as pH, water content and etc. However, those methods have some limits, such as when measuring skin surface pH which by using the glass electrode, there is the need to add water on the skin, influencing the water content measurement. We developed the measurement system with Dry-pH-sensor that consists of a platinum wire electrode and Ag/AgCl wire electrode, based on the Nernstian response. The purpose of this study was to examine whether the pH sensor could measure the skin surface pH without any water added, same as using water added glass electrode. Skin surface pH was measured for 2 minutes with using the sensor and glass electrode measurement was performed. The correlation between the sensor response averages of 90-120 s and skin surface pH was found (R=0.98). We concluded that Dry-pH-sensor could measure skin surface pH with same response as traditional sensor, without using any water.