title: [Investigation on electrochemical behavior of emodin and its application].
abstract: Emodin showed a second-order derivative reduction wave with peak potential of -0.75 V (SCE) by single sweep oscillopolarography using H3BO3-Na2B4O7 (pH 8.50) as base solution. The peak height of emodin is proportional to the concentration in the range of 1.42 x 10(-7)-5.7 x 10(-6) mol.L-1 and 7.1 x 10(-6)-7.1 x 10(-5) mol.L-1, respectively. The detection limit is 0.7 x 10(-7) mol.L-1. It can be employed for the determination of emodin in Rheum officinale Baill with satisfaction. The electrochemical behavior of emodin was studied and the electrode reaction mechanism was proposed. In addition, it was found that emodin, aloe-emodin, chrysophanol, rhein and physcion can scavenge superoxide anion radical produced by the autoxidation of pyrogallol. The scavenging activity is in the order: emodin > aloe-emodin > chrysophanol > rhein > physcion.
authors.affiliation: Graduate School, USTC, Academia Sinica, Beijing 100039.
authors.forename: H
authors.initials: H
authors.lastname: Zou
authors.forename: Z B
authors.initials: ZB
authors.lastname: Yuan
mesh_terms: D000880:Anthraquinones; D004563:Electrochemistry; D004642:Emodin / Q000032:analysis* / Q000737:chemistry; D016166:Free Radical Scavengers; D010946:Plants, Medicinal; D011048:Polarography / Q000379:methods; D012250:Rheum / Q000737:chemistry*
chemical_list: D000880:Anthraquinones; D016166:Free Radical Scavengers; C518327:aloe emodin; D004642:Emodin