Changes in Transmitted Light of Monoolein PVC Membrane for Sour Solutions.

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In this paper we describe the optical characteristics of the Monoolein PVC membrane to sour solutions. The Monoolein PVC membrane was composed of polyvinyl chloride (PVC) and a synthetic lipid (Monoolein). Optical transmittance of the membrane changed remarkably after the membrane was immersed in six different sour solutions (Acetic acid, Citric acid, Formic acid, Hydrochloric acid, Lactic acid and Oxalic acid). Using an optical measurement system with optical semi-conductor devices (Light Emitting Diodes and Photo Transistors), the optical characteristics of the membrane for the sour solutions could be measured quantitatively as an intensity variation of the transmitted light of the membrane. Since the optical intensity of the transmitted light increased with different patterns in the sour solutions, the membrane had an optical selectivity. The transmitted light intensity to sour solutions were similar to the human sourness responses. To improve the time responses of the membrane reacting sour solutions, we mixed a plasticizer (di-n-butyl phthalate or tri-n-butyl phosphate) into the membrane. As a result, the time responses of the membrane became quick, and approached to the human characteristics for several sour solutions. By taking advantage of those optical characteristics, new usages, optical taste sensor and so on, are expected in the field of an ion sensing material.
一般社団法人日本生体医工学会の論文