Abstract
A novel, simple and precise electrochemical biosensor, was developed for measuring mevalonic acid (MA) concentration, which is thought to be a good indicator of HMG-CoA reductase activity. This sensor is based on noncovalent-linking NAD+/MWNTs nanocomposite coated on a screen-printed electrode (SPE). The resulting biosensor exhibited excellent electrocatalytic activity, fast response and good stability to MA. At the NAD+/MWNTs-modified SPE, the current is linear with the concentration of MA being within a concentration range from 18.1 to 145 μM with a limit of detection down to 4.25 μM (S/N = 3), and the sensor exhibited a sensitivity of 92.2 μA/mM.
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