02169naa a2200337 a 450000100080000000500110000800800410001902400380006010000280009824501340012626000090026052011390026965000190140865000130142765000260144065000200146665000210148665300270150765300100153465300280154465300250157265300180159765300160161570000200163170000220165170000200167370000210169370000220171470000170173677300780175320100472015-02-26       2014    bl uuuu     u00u1 u    #d7 a10.1080/0972060X.2014.9312542DOI1 aALMEIDA, J. R. G. da S.  aChemical composition of essential oils from Croton conduplicatus (Euphorbiaceae) in two different seasons.h[electronic resource]  c2014  aCroton conduplicatus is a species popularly known in the Brazilian Caatinga (Semi-Arid vegetation) as quebra faca. Essential oils from the fresh lea ves were obtained by hydrodistillation in two different seasons (dry and rainy seasons) after 2, 3 and 4 hour s of extraction. Analyses were made by GC-MS. The main compounds found in the oil of leaves collected in the dry season were 1,8-cineole, p-cymene, spathulenol and caryophyllene oxide. For the essential oil coll ected in rainy season the major constituents identified were 1,8-cineole, -phellandrene, bicyclogermacrene, (E)-caryophyllene and spathulenol. The antioxidant potential was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2-azinobis-3- ethylbenzothiazoline-6-sulfonic acid (ABTS) scavengers methods, as well as the method of co-oxidation of -carotene/linoleic acid. A significant inhibitory effect of essential oils on ABTS free radicals was detected. C. conduplicatus is a natural source of antioxidants. The essential oils from the leaves contain constituents with antioxidative properties and could serve as inhibitors or scave ngers of free radicals  aEssential oils  aCaatinga  aComposição Química  aÓleo essencial  aPlanta medicinal  aAtividade antioxidante  aBioma  aConstituintes voláteis  aCroton conduplicatus  aPlanta nativa  aQuebra faca1 aSOUZA, A. V. de1 aSANTOS, U. S. dos1 aSOUZA, M. D. de1 aBISPO, L. dos P.1 aTURATTI, Z. C. C.1 aLOPES, N. P.  tJournal of Essential Oil Bearing Plantsgv. 17, n. 6, p. 1137-1145, 2014.