Development of Sensing System of Human Chemical Senses Using EQCM Method

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The EQCM measurement system was constructed during year first. Afterwards, basic characteristics of the electrochemical measurement method and the QCM measurement method were examined. Next year, the method of being form the sensing layer of lipid molecule on a Quartz resonator was examined. An electrochemical measurement and the QCM measurement were done by using the sensing element. The lipid membrane as the sensing layer was formed on the surface of the sensing element that was a Quartz resonator. Combining the simultaneous of electrochemical measurement and the QCM measurement was done by using this sensing element.At first, stability was lacked when QCM measurement was executed. The problem turned out in the structure of software and the cell of EQCM analyzer. It straightened out that problem by changing the material of the experiment procedure, data processing and the cell structure.It searched for the method of forming the lipid membrane with high receptivity to the taste substa … More nces on the surface of the Quartz resonator with high stability. The method of distributing a small amount of lipid in aqueous solution, and making the surface of the Quartz resonator physically adsorb the lipid molecule was adopted. The sensitivity improvement of one digit or more on the QCM measurement was obtained from a past formation method of sensing layer for the bitter substance by this physical adsorption method. Then, the electrochemical measurement and the QCM measurement were combined simultaneously using the EQCM analyzer and the Quartz resonator to make the lipid physically adsorbed. However, the response of the EQCM analyzer did not adjust to the result of QCM single measurement, and enough sensitivity was not obtained from EQCM analyzer.It has been estimated not to obtain an enough response by the difference of the driving circuit. Then, the electrochemical method was changed from cyclic voltammetry to the pulse voltammetry. As a result, a selective response to a strong adsorbent bitter substance that was one of the purposes of this research was obtained. Less