PURPOSE: To provide an LB film for measuring the concentration of a sample correctly by correcting decrease in the intensity of fluorescence due to deterioration of an optical chemical sensor easily and accurately. ;CONSTITUTION: In a Langmuir-Blodgett film prepared by transferring a monomolecular film formed by Langmuir-Blodgett method onto a support, an amphiphilic substance 11, a film potential sensitive coloring matter 13 and a substance 12 having recognizability of specific substance are contained in the film. A film potential insensitive coloring matter 14 inactive to the film potential sensitive coloring matter 13 and having optical characteristics different from those of the coloring matter 13 is also contained in the film.;COPYRIGHT: (C)1994,JPO&Japio
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