Dielectrophoresis (DEP) of single DNA (about 40 kbp) labeled with a fluorop
hore was successfully observed in a planar quadrupole electrode cell whose
working area was 65 mum in radius. The DEP behavior depended on frequency (
f) of alternating current: positive DEP at lower f and negative DEP at high
er f: The combination of the DEP force and a laminar flow in a capillary (8
2.5 mum in inner radius) with a quadrupole electrode controlled the elution
of DNA from the capillary as a function off.