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Electrophoresis of plain and DNA-substituted MnFe2O4 nanoparticles, reacted with (from left to right) (1) oleth 10 carboxylate, (2) oleth 10 carboxylate and DNA, (3) succinimidyl oleth 10 carboxylate, (4) a mixture of 1 and 5, prepared at room temperature less than 5 min before starting the migration; (5) succinimidyl oleth 10 carboxylate and DNA. The DNA is functionalized with an aminohexyl group at the 5′ end and is 24 bases long. Migration is toward the anode.
