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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estrat?gias de obten??o do corante do jambo vermelho (Syzygium malaccense) e avalia??o de sua funcionalidade

Azev?do, Juliana Chris Silva de 17 December 2010 (has links)
Made available in DSpace on 2014-12-17T15:01:24Z (GMT). No. of bitstreams: 1 JulianaCSA_DISSERT.pdf: 2885300 bytes, checksum: 18768d46af6895ea630731a4c28b4d2d (MD5) Previous issue date: 2010-12-17 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The food industry is interested in natural products. Anthocyanins are phenolic antioxidants of great importance with health-relevant applications. Several studies have linked the intake of fruits and vegetables with reduced risk of chronic degenerative diseases because of its antioxidant properties. This study aimed to compare different strategies for obtaining natural pigments from red jambo (Syzygium malaccence) and analyze its functional potential. Two different strategies were studied: (1) solid-liquid extraction (SLE) in reactor with controlled parameters, (2) powder obtention. The investigation of the functional potential was conducted taking into account the total phenolic content (TPC), the antioxidant activity (AA), the total anthocyanins concentration (TA) and α-amylase and α-glucosidase inhibition. The best extracts obtained by SLE showed TPC of 174.15 mg GAE/100g, AA of 3.56 μmol Trolox eq/g and TA of 133.59 mg cyd-3-glu/100 g. The best results for the second strategy were TPC of 1024.22 mg GAE/100 g, AA of 29.03 μmol Trolox eq/g and TA of 1193.41 mg cyd-3- glu/100 g. It was observed moderate amylase inhibition (26.30%) and high glucosidase inhibitory activity (97.47%). Skin extracts showed, in general, superior results when compared to whole red jambo, with superior values for dehydrated products. Based on our result, red jambo can be considered as a rich source of phenolic antioxidants, as well on amylase and glucosidase inhibitors / A ind?stria aliment?cia demonstra forte interesse em estudos de extra??o envolvendo produtos naturais. A antocianina ? um fen?lico antioxidante de grande import?ncia e atua??o no organismo dos seres vivos. V?rios estudos relacionam ? ingest?o de frutas e vegetais com a diminui??o do risco e desenvolvimento de doen?as cr?nicodegenerativas em fun??o de suas propriedades antioxidantes. Este trabalho teve como objetivo comparar diferentes estrat?gias de obten??o do corante da casca e do jambo inteiro sem caro?o e analisar seu potencial funcional. Duas diferentes estrat?gias foram estudadas: (1) extra??o s?lido-l?quido em reator enjaquetado com controle de par?metros; (2) obten??o do p?. A investiga??o do potencial funcional foi realizada por meio de an?lises quanto ao teor de compostos fen?licos totais (CFT), a atividade antioxidante (AA), a concentra??o de antocianinas totais (AT) e a inibi??o das enzimas α-amilase e α-glicosidase. Os extratos com os melhores resultados para a estrat?gia 1 foram para CFT de 174,15 mg GAE/100 g, para a AA de 3,56 μmol Trolox eq/g e para AT de 133,59 mg ci-3-gli/100 g. Os melhores valores para a estrat?gia 2 foram para CFT de 1024,22 mg GAE/100 g, para AA de 29,03 μmol Trolox eq/g e para AT de 1193,41 mg ci-3-gli/100 g. A a??o inibit?ria das enzimas α-amilase (26,30%) e α-glicosidase (97,47%) mostraram-se potentes. Os extratos da casca apresentaram, de maneira geral, resultados superiores quando comparados aos valores dos extratos do jambo inteiro e as maiores quantifica??es foram obtidas dos produtos desidratados. As amostras analisadas exibiram fontes satisfat?rias de fen?licos antoci?nicos, com potente capacidade antioxidante e atividade inibit?ria das enzimas α-amilase e α-glicosidase

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