Flavonoid analysis and antioxidant action in Croton echinocarpus Müll.Arg. and Croton vulnerarius Baill - Ravanelli, Natália; Motta, Lucimar Barbosa da; Santos, Deborah Yara Alves Cursino dos; Salatino, Maria Luiza Faria; Salatino, Antonio; Furlan, Cláudia Maria (Brazilian Conference on Natural Products, 2011)