Antioxidant activity of extracts of freeze-dried Brazilian plants / Atividade antioxidante de extratos liofilizados de plantas brasileiras

AUTOR(ES)
DATA DE PUBLICAÇÃO

1985

RESUMO

Antioxidant aetivity of liophilized extraets of Brasilian plants, The antioxidante aetivities of 140 lyophilized extraets of different parts of 4S Brasilian plants were evaluated in amodel aqueous system eontaining B-earotene and linolei aeid. The exttaets that presented a marked proteetive effeet were subsequen-.tly tested in a lipid system (soybean oil). Different ehromatographie teehniques (paper, thinlayer, high performanee liquid and gas-liquid) were used to separa te toe eompounds present in four extraets whieh were most aetive in the two systems. Fraetions of extraets of Piptadenia macrocarpa (leaves}, Mikania smiZacina (leaves), SoZanum viarum (leavesand branehesl and. Coch Zospermum insigne (roots) showed antioxidant., aetivi" ty similar to or greater than that shown by BHT (2,6 di-ter -butil p~eresol) in the lipidie system. It was not possible to identify these fraetions since each was a mixture of various components. Using ultraviolet speetroseopy (UV), proton magnetic resonanee (.PMR) and mass spectrometry (MS) , the presence of the flavonoid dihydrokaempferol (.3, 4 I, S, 7-tetrahydroxydihydroflavo-noll was deteeted in the e.xtraet of the roót of CochZospermum in-si gne. This substanee had not been previously reported in the Íamily Coehlospermaeeae.Dihydrokaempferol, although present in an extract.with a oigh antioxidant activity, showed no aetivity in soybean oilwhen added at a eoneentration

ASSUNTO(S)

oilseed plants antioxidantes antioxidants plantas oleaginosas - brasil food products produtos alimenticios - armazenagem

ACESSO AO ARTIGO

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