| Autor: |
Lai-Bo Yu, Qi Feng Chen, Li-Jun Li, Hao Cheng, Hong-Xing Kong, Jian-Ling Wu, Feng-Min Wu |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Chinese Journal of Analytical Chemistry. 35:933-937 |
| ISSN: |
1872-2040 |
| DOI: |
10.1016/s1872-2040(07)60060-7 |
| Popis: |
L-cysteine self-assembled monolayers have been fabricated on the surface of gold electrode (L-Cys/SAM-Au/CME), and also the electrochemical behaviors of ferulic acid on the modified electrode were investigated. The self-assembled monolayer modified electrode was applied to the flow-injection irreversible biamperometric analysis. The irreversible system was composed of electrocatalytic oxidation of ferulic acid on L-cysteine-gold-modified electrode and reduction of permanganate at the other bare gold electrode. This novel method was used to establish the flow-injection irreversible biamperometric system under the applied potential difference of 0 V. In the 0.05 M sulfuric acid, the oxidative peak current increases linearly with the concentration of ferulic acid in the range of 5 × 10−7−8 × 10−5 M, linear regression equation: i(nA) = 4.16 × 107 C + 50, and in the range of 1 × 10−4−1 × 10−3 M, linear regression equation: i(nA) = 5.6 × 106 C + 300 with a sampling frequency of 80 samples per hour. The detection limit for ferulic acid is 1.2 × 10−7 M, and the RSD for 25 replicate determination of 2.00 × 10−5 M ferulic acid is 1.20%. This proposed method has the advantage of wide linear range, high selectivity and sensitivity. This proposed method was applied to the analysis of sodium ferulate injection with satisfactory results. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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