An 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS)-immobilized carbon nanotube (CNT) electrode was used to simultaneously detect dopamine (DA) and uric acid (UA) in the presence of ascorbic acid (AA) with differential pulse voltammetry. When ABTS was immobilized onto the CNT electrode in the presence of DA, UA and 100. μM AA, the sensitivity to DA increased from 0.600 (±0.013) to 1.334 (±0.010). μA/μM in the concentration ranges of 0.90-10. μM and 1.87-20. μM, respectively, and the sensitivity to UA increased from 0.030 (±0.005) to 0.078 (±0.006). μA/μM in the concentration ranges of 2.16-240. μM and 3.07-400. μM, respectively. These findings demonstrate that the ABTS-immobilized CNT electrode attained a higher sensitivity to UA and also a wider linear range of concentrations.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry