To provide a sample concentrating device which can concentrate particles to be detected to a high concentration.
The inner wall surface of a passage 14 is negatively charged, and positive ions 30 contained in a sample solution 28 in the passage 14 are adsorbed on the inner wall surface of the passage 14. When an electric field is generated between electrodes 18, 19 for concentration, negatively charged particles 29 in the sample solution 28 in a concentration area between the electrodes 18, 19 for concentration is forced in the reverse direction of the electric field and moved (electrophoresis), and attracted to the electrode 18 for concentration to be flocculated and to be concentrated at the electrode 18 for concentration. The positive ions 30 are moved in the electric field direction by Coulomb force to generate a flow (electroosmotic flow) of the sample solution 28. Consequently, the particles 29 are continuously supplied to the concentration area by the electroosmotic flow, and the supplied particles 29 are concentrated by the electrophoresis.
KAMIYAMA SUSUMU
IWASAKA HIROYUKI
