The stability, reusability, and reproducibility of the aptasensor
for detecting TMB was tested by DPV. The relative standard
deviation (RSD) of the current peak at the aptasensor were 1.9%
for 10 continuous cycles and 6.0% for five parallel measurements of
TMB. Since the aptasensor was easily regenerated in 2 M NaCl, the
current response of TMB retained 85% of the original response after
7 days. Additionally, the batch-prepared six sensors that were
tested at same conditions and exhibited the RSD of 3.9%, showing
acceptable reproducibility.