ficient that can be predetermined. By determining a specific set of conditions
(i.e., constant geometry, magnetic field, materials, etc.), the selected volumetric
susceptibility range becomes a function of the time that the particles are in
motion. The relationship between the susceptibility range separated and time
could then be condensed into a single mathematical equation. The constant
produced as a result of the fixed variables would give an indication of the ratio
of particles in the upper cavity compared with the number of particles in the
lower cavity at the separating time.
Experiments using inactivated magnetotactic bacteria and a single permanent magnet repeatedly confirmed that rather weak magnetic particles
could be translated at a controlled velocity through an aqueous medium over
distances up to 2 cm.
Multistage Magnetic and Electrophoretic Extraction of Cells, Particles and Macromolecules
151
Fig. 4. Multistage electromagnetic separator compared with a magnetic chromatography
column