Selective Detection of Hydroxyl Radical Scavenging Capacity Based on Electrogenerated Chemiluminescence Detection Using Tris(2,2′-bipyridine)ruthenium(III) by Flow Injection Analysis

We describe a new method for detecting hydroxyl radical scavenging capacity based on tris(2,2'-bipyricline)ruthenium(III) [Ru(bpy)(3)(3+)] chemiluminescence and flow injection analysis. Hydroxyl radicals were generated by the Fenton reaction. The scavenging capacity of the six antioxidants tested decreased in the following order: edaravone>L-tryptophan>gailic acid >Trolox >N-acetyl-L-cysteine> ascorbic acid. The proposed method allowed a sample throughput of about 80 samples/h. The six antioxidants were found to inhibit chemiluminescence intensity of Ru(bpy)(3)(2+). The proposed method is a rapid, selective, and accurate procedure for the study of hydroxyl radical scavenging capacity by Ru(bpy)(3)(3+) chemiluminescence.