DETECTION OF BITTER OR SCENT SUBSTANCE

PURPOSE:To detect a bitter or scent substance, by making the bitter or scent substance absorb on a film of an immobilized 2mol. membrane to measure changes in the film potential or film resistance. CONSTITUTION:An immobilized 2mol. membrane film 1 is fixed, for example, at the tip of a polyethylene tube 2 and arranged by way of an inner water phase 6 containing no bitter and scant substance and an outer water phase containing a bitter or scant substance as injected at a bitter or scent substance injection port 5. Two measuring points of a galvanostat which composes a means to measure changes in the membrane potential or membrane resistance are inserted into the outer water phase 4 and the inner water phase 6 separately. The membrane potential is measured with an Ag/AgCl/KClsat electrode in an NaCl aqueous solution, for example, with 5mM for the inner water phase 6 and 0.5mM for the outer water phase 4. The membrane resistance is measured with an LCR meter in an NaCl aqueous solution with 0.1M both for the inner and outer water phases using a platinum electrode.