avaliação do potencial antioxidante e extração subcrítica do óleo de linhaça evaluation of the antioxidant potential and sub-critical extraction of linseed oil

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ID: 207659
2008
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Abstract
As sementes de linhaça são ricas em ácidos graxos essenciais, fibras e compostos fenólicos, que exercem atividade antioxidante. O presente trabalho propôs a obtenção do óleo de linhaça a partir de diferentes métodos de extração (solvente orgânico e com CO2 subcrítico), a observação da presença de compostos com potencial antioxidante nas sementes, utilizando a Cromatografia em Camada Delgada (CCD) e ainda, a avaliação da efetividade através da co-oxidação de substratos do sistema β-caroteno/ácido linoléico. Para a CCD, foram utilizados os reveladores β-caroteno/ácido linoléico e cloreto férrico/ferricianeto de potássio. Para a atividade antioxidante foram feitas medidas espectrofotométricas de soluções contendo o sistema oxidante β-caroteno/ácido linoléico, com leituras a cada 15 minutos/2 horas. Em todos os extratos evidenciou-se a presença de compostos fenólicos antioxidantes, contudo, o extrato aquoso apresentou melhor atividade antioxidante nos volumes de 100 e 200 µL. O processo que apresentou maior rendimento foi a extração com Solvente Orgânico (SO), com o éter etílico como solvente (25,89%).
Linseeds are rich in essential fatty acids, fibers and phenolic compounds, which have antioxidant activity. This work proposed obtaining linseed oil through different extraction methods (organic solvent and sub-critical CO2), observing the presence of compounds with antioxidant potential in the seeds through Thin-Layer Chromatography (TLC) and evaluating the co-oxidation of substrates of the β-carotene/linoleic acid system. For TLC, the detection reagents β-carotene/linoleic acid and ferric chloride/potassium ferricyanide were used. For antioxidant activity, spectrophotometric measurements of solutions containing the oxidant system β-carotene/linoleic acid were made, with readings every 15 minutes/2 hours. The presence of phenolic antioxidant compounds was evidenced in all extracts; however, the aqueous extract presented greater antioxidant activity in the volumes of 100 and 200 µL. The highest extraction yield was obtained through organic solvent extraction, with ethyl ether as solvent (25.89%).
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galvo2008foodavaliao Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Elisângela Lopes Galvão, Débora Cristina Fernandes da Silva, Jamile Oliveira da Silva, Ana Vládia Bandeira Moreira, Elisa Maria Bittencourt Dutra de Sousa
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Journal software - practice and experience
Year 2008
DOI
10.1590/S0101-20612008000300008
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612008000300008
Keywords
antioxidant activity foods and food supplytechnology (general)

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