As mentioned above, the CPA value obtained using taste sensor reflects the change in the membrane potential caused by the adsorption of taste substances onto lipid/polymer membranes. The effect of weakly adsorptive substances such as salty and sour substances can be eliminated, showing a high selectivity to each taste. The amount of taste substances adsorbed onto the lipid/polymer membrane generally depends on the content of lipid in the membrane. The following experiment was carried out to confirm the relationship between the amount of taste substances adsorbed onto the lipid/polymer membrane and the CPA value.