t The present study involves the development of
nanobiosensor to determine toxicological behavior of
Mitoxantrone (MTX). Mitoxantrone intercalates with DNA
and produces MTX–DNA adduct, resulting in blockade of
protein synthesis and excessive production of free radicals
in the myocardium eventually leads to cardiac toxicity.
Potentiometry was applied to develop an electroanalytical
procedure for the determination of MTX and its interaction
with DNA immobilized on the electrode surface modified
with Silicon dioxide (SiO2) nanoparticles. The nanobiosensor
immersed in MTX solution to monitor MTX–DNA
interaction with respect to time and alters the resistance of
the nanobiosensor. It was observed that MTX–DNA
interaction is fast initially and as time elapses, the change
in interaction gets slow due to formation of MTX–DNA
adduct. Determination limit of the nanobiosensor is
100–10 ng/ml. This study suggests that the nanobiosensor
allows real-time monitoring of the drug–DNA interaction
changes by measuring the potential at sensor interface
which can prove to be an important tool in drug discovery
pipelines and molecular toxicology.