53 ResumoAnnona crassiflora (araticum), Solanum lycocarpum (lobeira), Eugenia dysenterica (cagaita), Caryocar brasilense (pequi) e Swartzia langsdorfii (banha de galinha) são frutas do bioma cerrado, conhecidas e consumidas principalmente por populações nativas dessa região. Nesse estudo, as diferentes frações dos frutos acima descritos (polpa, semente e casca) foram avaliadas por meio de extratos aquosos e etanólicos. Alguns extratos mostraram altíssimos conteúdos de compostos fenólicos e foram escolhidos para avaliação do potencial em seqüestrar radicais livres por meio do modelo 2,2 difenil-1-picril hidrazil (DPPH). Os melhores resultados foram: extrato aquoso e etanólico de casca de pequi (IC 50 igual a 9,44 e 17,98 mg.mL -1 respectivamente), extrato etanólico de sementes de cagaita (IC 50 igual a 14,15 mg.mL -1 ), extrato etanólico de sementes e casca de araticum (IC 50 igual a 30,97 e 49,18 mg.mL -1 , respectivamente). Este é o primeiro estudo que avalia o potencial em seqüestrar radicais livres de frações de frutas do cerrado. Os resultados indicam que os extratos possuem grande potencial antioxidante e estudos adicionais são necessários para avaliar essa propriedade dos extratos como uma aplicação sustentável dos recursos do cerrado nos setores farmacêuticos, cosméticos e nutricionais. Palavras-chave: frutas tropicais; cerrado; atividade antioxidante; DPPH; fenóis. AbstractAnnona crassiflora (araticum), Solanum lycocarpum (lobeira), Eugenia dysenterica (cagaita), Caryocar brasilense (pequi) and Swartzia langsdorfii (banha de galinha) are tropical fruits consumed mainly by native people in the Brazilian Cerrado (second biggest biome of Brazil). In this study, pulp, seed and peel of the fruits were extracted using ethanol and water. Some of the extracts showed a high content of total phenols and were screened for their potential as antioxidants using the in vitro model 2,2-diphenyl-1-picryl hydrazyl (DPPH). The best results were found for aqueous and ethanolic extracts of pequi peel (IC 50 of 9,44 and 17,98 mg.mL -1 respectively), etanolic extract of cagaita seeds (IC 50 of 14,15 mg.mL -1 ), etanolic extract of araticum seeds and peel (IC 50 of 30,97 and 49,18 mg.mL -1 respectively). This is the first report on the antioxidant properties of the extracts of cerrado fruit fractions. Owing to these properties, studies can be further extended to use them for possible applications as natural antioxidant for cosmetics, supplements and functional ingredients for food products as well as being able to represent a sustainable application of the natural sources in the Brazilian bioma cerrado. Keywords: tropical fruits; cerrado; antioxidant activity; DPPH; phenols. Atividade antioxidante de frutas do cerrado Antioxidant activity of cerrado fruitsRoberta ROESLER 1 *, Luciana Gomes MALTA 1 , Luciana Cristina CARRASCO 1 , Roseane Barata HOLANDA 1 , Clélia Alves Socorro SOUSA 2 , Glaucia Maria PASTORE 1 IntroduçãoA oxidação é um processo metabólico que leva à produção de energia necessária para as atividades essenciais d...

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The effect of the intake of freeze-dried jaboticaba peel powder on the antioxidant potential of rats' blood plasma was investigated in two experiments. In the first, 35 male rats, divided into 5 groups, received 7 mg of anthocyanins/100 g of body weight, by gavage. The blood was withdrawn 0, 30, 60, and 120 min after gavage. The antioxidant capacity was evaluated in plasma by ORAC and TEAC. There was no significant difference in the plasmatic antioxidant potential among the groups. In the second experiment, 40 male rats were divided into 4 groups that consumed, respectively, 0, 1, 2, and 4% of freeze-dried jaboticaba peel powder added to their diet. An increase in the plasmatic antioxidant potential was observed for groups that received 1 and 2% of jaboticaba peel powder (1.7 times by TEAC method and 1.3 times by ORAC); however, the group that received 4% of the powder did not show antioxidant effects according to the methods used.

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