title: On-line HPLC method for screening of antioxidants against superoxide anion radical from complex mixtures.
abstract: A practical approach for rapidly screening antioxidants against superoxide anion radicals from complex mixtures was developed based on the quantitative difference in active compounds before and after their reaction. To test the effectiveness of the approach, seven flavonoids with antioxidative properties were investigated both individually and in a mixture. Using the approach, antioxidants could be rapidly separated and screened with a ranked order of activities in the meantime. The radical scavenging activities were in the following order: quercetin > kaempferol > fisetin > puerarin > luteolin > rutin > baicalein. The order of activity was conducted by comparing the scavenging ratio of the antioxidant, which was completely consistent with the results obtained from the traditional electronic spin resonance. Then, the method was successfully applied to black tea extracts. This approach is fast and convenient for screening, isolating, and analyzing potential antioxidants from a mixture with good quantitative and reproducible ability.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou, PR China. suncuirong@zju.edu.cn
authors.forename: Cuirong
authors.initials: C
authors.lastname: Sun
authors.forename: Jindi
authors.initials: J
authors.lastname: Fu
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Chen
authors.forename: Liyan
authors.initials: L
authors.lastname: Jiang
authors.forename: Yuanjiang
authors.initials: Y
authors.lastname: Pan
mesh_terms: D000838:Anions / Q000737:chemistry; D000975:Antioxidants / Q000032:analysis* / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D045424:Complex Mixtures / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D015203:Reproducibility of Results; D013237:Stereoisomerism; D013481:Superoxides / Q000737:chemistry*
chemical_list: D000838:Anions; D000975:Antioxidants; D045424:Complex Mixtures; D016166:Free Radical Scavengers; D010936:Plant Extracts; D013481:Superoxides