Abstract
A biosensor for amperometric determination of nitrite was developed using cytochrome c nitrite reductase (ccNiR) from Desulfovibrio desulfuricans immobilized and electrically connected on a glassy carbon electrode by entrapment into redox active [ZnCr-AQS] layered double hydroxide containing anthraquinone-2-sulfonate (AQS). The transduction step corresponded to the electro-enzymatic reduction of nitrite by immobilized AQS molecules at -0.6 V. The biosensor showed a fast response to nitrite (5 s) with a linear range between 0.015 and 2.35 μM, a sensitivity of 1.8 A M-1 cm-2 and a detection limit of 4 nM. The apparent Michaelis-Menten constant (KMapp) was 7.5 μM.
| Original language | English |
|---|---|
| Pages (from-to) | 2240-2245 |
| Number of pages | 6 |
| Journal | Electrochemistry Communications |
| Volume | 9 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sept 2007 |
Keywords
- Anthraquinone sulfonate
- Biosensor
- Layered double hydroxides
- Nitrite
- Nitrite reductase