1 research outputs found
Method for Low Nanomolar Concentration Analyte Sensing Using Electrochemical Enzymatic Biosensors
We introduce a new
electrochemical measurement method compatible
with an enzymatic biosensor that is capable of analyte sensing down
to the low nanomolar concentration regime. This method is termed accumulation
mode sensing and utilizes an immobilized redox polymer mediator wired
to an oxidoreductase enzyme to store charge during a premeasurement
charge concentration step, followed by a measurement step in which
this accumulated charge is quantified. We demonstrate this new method
using a model glucose sensor and show how the sensitivity of a sensor
can be modified simply by adjusting the time duration of the charge
concentration step. We achieve a limit of detection of 4.7 ±
1.4 nM using accumulation mode sensing, which represents a 25-fold
improvement over traditional amperometry