Patent ID: 7453573

Claim:
A measuring apparatus comprising: a first measuring unit that measures a concentration of an organic solvent in a sample solution obtained by dissolving a sample substance as a measurement target in the organic solvent; a second measuring unit that measures a concentration of the organic solvent in a concentration control solution which does not contain the sample substance but contains the organic solvent; a calculating unit that calculates a mixture amount of the concentration control solution to be mixed into a preset amount of the sample solution so that the concentration of the organic solvent in the sample solution is equal to a preset concentration based on the concentration measured by the first measuring unit and the concentration measured by the second measuring unit; a mixing unit that mixes the mixture amount of the concentration control solution calculated by the calculating unit with the preset amount of the sample solution; and a third measuring unit that supplies a mixture solution obtained by the mixing unit to a measurement region in which a bioactive substance is immobilized in advance, and measuring an interaction between the bioactive substance and the sample substance in the mixture solution based on a result of measuring a refraction index of a light incident on the measurement region.