title: Pallidol, a resveratrol dimer from red wine, is a selective singlet oxygen quencher.
abstract: Pallidol is a naturally occurring resveratrol dimer from red wine with antioxidant and antifungal activities. In this report, with the use of the EPR spin-trapping technique, the scavenging and quenching effects of pallidol on reactive oxygen species (ROS) were investigated. The results demonstrated that pallidol showed strong quenching effects on singlet oxygen at very low concentrations, but it was ineffective to scavenge hydroxyl radicals or superoxide anions. Further kinetic study revealed that the reaction of pallidol with singlet oxygen had an extremely high rate constant (k(a)=1.71x10(10)). Therefore, pallidol is a potent and selective singlet oxygen quencher in aqueous systems. It may be used in singlet oxygen-mediated diseases as a pharmacological agent, which may contribute to the health beneficial effects of red wine.
authors.affiliation: Department of Chemistry, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China.
authors.forename: Shan
authors.initials: S
authors.lastname: He
authors.forename: Liyan
authors.initials: L
authors.lastname: Jiang
authors.forename: Bin
authors.initials: B
authors.lastname: Wu
authors.forename: Yuanjiang
authors.initials: Y
authors.lastname: Pan
authors.forename: Cuirong
authors.initials: C
authors.lastname: Sun
mesh_terms: D019281:Dimerization; D016166:Free Radical Scavengers / Q000737:chemistry* / Q000494:pharmacology; D011083:Polycyclic Compounds / Q000737:chemistry* / Q000494:pharmacology; D000077185:Resveratrol; D026082:Singlet Oxygen / Q000737:chemistry*; D013267:Stilbenes / Q000737:chemistry* / Q000494:pharmacology; D014920:Wine
chemical_list: D016166:Free Radical Scavengers; D011083:Polycyclic Compounds; D013267:Stilbenes; C535072:pallidol; D026082:Singlet Oxygen; D000077185:Resveratrol