Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1247412 | Talanta | 2006 | 5 Pages |
Abstract
Several hydroxyanthraquinones (emodin, rhein and physcion) were found to strongly enhance the cathodic electrochemiluminescence (ECL) of the lucigenin by scanning under the mode of differential pulse voltammetry. The enhanced intensity was linear with the concentrations of rhein, emodin and physcion. The linear calibration ranges of 8.0 Ã 10â8 to 2.0 Ã 10â6, 3.0 Ã 10â7 to 8.0 Ã 10â6 and 1.0 Ã 10â7 to 1.0 Ã 10â6 mol/L, the detection limits of 2.1 Ã 10â8, 1.6 Ã 10â7 and 5.2 Ã 10â8 mol/L were obtained for rhein, emodin and physcion, respectively. Potential-resolved ECL was used to study the possible mechanism of the enhancement effect. An electron transfer pathway was found to be involved in the ECL process. It has been confirmed that the reduced hydroxyanthraquinones reacted with dioxygen to give superoxide radical anion which increased the ECL of the lucigenin. Furthermore, these three hydroxyanthraquinones revealed the different enhanced ECL efficiency in the following order: rhein > physcion > emodin.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Yingying Su, Jian Wang, Guonan Chen,