Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10554471 | Journal of Pharmaceutical and Biomedical Analysis | 2005 | 7 Pages |
Abstract
An amperometric biosensor for total biogenic amine determinations, using a carbon paste electrode modified with horseradish peroxidase (HRP) enzyme is described. The HRP immobilization on graphite was made using bovine serum albumin, carbodiimide and glutaraldehyde. The biosensor response was optimized using serotonin and it presented the best performance in 0.1 mol lâ1 phosphate buffer (pH = 7.0) containing 10 μmol lâ1 of hydrogen peroxide. Under optimized operational conditions at â50 mV versus SCE, a linear response range from 40 to 470 ng mlâ1 was obtained. The detection limit was 17 ng mlâ1 and the response time was 0.5 s. The proposed sensor presented a stable response during 4 h under continuous monitoring. The difference of the response between six sensor preparations was <2%. The sensor was applied in the determination of total biogenic amines (neurotransmitters) in rat blood samples with success, obtaining a recovery average of 102%.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Tânia Jacometo Castilho, Maria del Pilar Taboada Sotomayor, Lauro Tatsuo Kubota,