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Doctoral Thesis
DOI
https://doi.org/10.11606/T.9.2008.tde-13012009-130211
Document
Author
Full name
Marcia da Silva Pinto
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Genovese, Maria Inês (President)
Gamboa, Ian Castro
Hassimotto, Neuza Mariko Aymoto
Salatino, Antonio
Shetty, Kalidas
Title in Portuguese
Compostos bioativos de cultivares brasileiras de morango (Fragaria x ananassa Duch.): caracterização e estudo da biodisponibilidade dos derivados de ácido elágico
Keywords in Portuguese
Ácido elágico
Antioxidante (Atividade)
Biodisponibilidade
Capacidade antioxidante
Compostos bioativos
Elagitaninos
Flavonóides (Determinação)
Morango (Estudo; Composição)
Vitamina C
Abstract in Portuguese
O morango representa boa fonte de vitamina C, flavonóides e derivados de ácido elágico e tem ampla aceitação pela população brasileira. Os objetivos deste trabalho foram: caracterizar diferentes cultivares quanto aos teores de compostos bioativos, otimizar a metodologia para quantificação do conteúdo de ácido elágico total, purificar e caracterizar estruturalmente os elagitaninos, avaliar sua potencial atividade antiproliferativa, anti-diabetes tipo 2 e anti-hipertensão, estudar a biodisponibilidade desses compostos in vivo. Os resultados demonstraram que existem diferenças significativas nos teores de compostos bioativos entre as cultivares. As melhores condições para determinação dos teores de ácido elágico total foram: extração em acetona 80% e posterior hidrólise com ácido trifluoracético (TFA) 2N a 120 °C por 60 minutos. A precipitação com acetato de itérbio foi o método mais eficiente para a purificação dos elagitaninos. Após administração por gavagem a ratos de um purificado de elagitaninos, nenhum composto foi detectado no plasma e tecidos analisados.
Title in English
Bioactive compounds from Brazilian strawberry cultivars (Fragaria x ananassa Duch.): Characterization and bioavailability of ellagic acid derivatives
Keywords in English
Antioxidant capacity
Bioactive compounds
Bioavailability
Ellagic acid
Ellagitannins
Flavonoids (Determination)
Strawberry
Vitamin C
Abstract in English
Strawberries are a good source of vitamin C, flavonoids and ellagic acid derivatives and are consumed in Brazil in large quantities. The objectives of the present work were: characterization of different cultivars with respect to the content of bioactive compounds, optimization of the method for quantification of total ellagic acid content, purification and structural identification of ellagitannins, evaluation of their antiproliferative, anti-type 2 diabetes and anti-hypertension potentials, investigation of their in vivo bioavailability. The results indicated that there were significant differences in bioactive compounds among the strawberry cultivars. The best conditions for the determination of the total ellagic acid content in strawberries were extraction with 80% acetone, and hydrolysis using 2N TFA at 120 °C for 60 minutes. The precipitation method using ytterbium acetate was the most efficient in purifying the ellagitannins. After administration of purified ellagitannins to rats by gavage, no compound was detected in plasma or tissue samples analyzed.
 
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TESE.pdf (1.29 Mbytes)
Publishing Date
2009-03-10
 
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