Related Experiment Video
Updated: Aug 24, 2026

Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
Published on: July 5, 2017
Antioxidant and free radical scavenging activities of 5,7,3'-trihydroxy-3,6,4'-trimethoxyflavone from Brickellia
R M Pérez G1, R Vargas S, F J Martinez M
1Laboratorio de Investigacion de Productos Naturales, Escuela Superior de Ingeniería Química e Industias extractivas IPN, Punto fi jo 16, col. Torres Lindavista cp 07708, México D.F. México. rmpg@prodigy.net.mx
Abstract:
The antioxidant and antiradical activities of 5,7,3'-trihydroxy-3,6,4'-trimethoxyflavone or centaureidin isolated and characterized from Brickellia veronicaefolia were elucidated by heat-induced oxidation in a beta-carotene and linoleic acid system and by the 1,1-diphenyl-2-picrylhydrazyl decoloration test. The centaureidin (32.1%) exhibited antioxidative activity less than that of BHT (95.5%) and alpha-tocopherol (95.9%) on oxidation in a beta-carotene and linoleic acid system. A moderate antiradical effect (47.6%) compared with BHT (96.7%) and alpha-tocopherol (94.6%) in DPPH decoloration test was found.
Related Concept Videos
Radical Autoxidation
Oxidation of Phenols to Quinones
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
Radical Reactivity: Steric Effects
Along with electronic factors, steric factors also account...
Radical Chain-Growth Polymerization: Overview
