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Publication
Estudo da composição fenólica e da capacidade antioxidante de genótipos de Rubus Idaeus L.
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| 2.96 MB | Adobe PDF |
Authors
Abstract(s)
A produção de framboesa em Portugal assume hoje um grande interesse económico para os agricultores, especialmente no Alentejo Litoral e no Algarve. As framboesas são frutos nutricionalmente densos e abundantes em compostos bioativos. A ingestão destes frutos tem sido associada a efeitos fisiológicos benéficos, para além dos nutricionais. Em 2018, o INIAV, I.P. e a empresa Beira Baga iniciaram um pequeno programa de melhoramento genético visando o fornecimento de cultivares de framboesa para todos os produtores.
Este trabalho compreendeu uma revisão narrativa (2011-2021) sobre efeitos benéficos para a saúde de polifenóis da framboesa com atividade antioxidante e a determinação do teor em humidade, grau Brix, conteúdo em fenóis totais e da atividade antioxidante in vitro (método FRAP) de 5 genótipos de framboesa vermelha (GFV) e 1 de framboesa amarela (GFA), selecionados no âmbito do programa de melhoramento referido, e de 4 cultivares de framboesa vermelha (Cv).
Na revisão narrativa, foram encontrados artigos sobre diversos temas ligados à saúde (síndrome metabólica, doenças neurodegenerativas, fotoenvelhecimento), que alegam benefícios para a mesma sobretudo resultado de polifenóis da framboesa. Alguns artigos relatam estudos de intervenção em humanos, nomeadamente estudos randomizados e controlados e estudos de biodisponibilidade.
Os dados obtidos para as diferentes amostras estão dentro dos valores publicados para a framboesa. Os resultados médios obtidos para o teor de humidade e o grau Brix, variaram entre 87,4 - 90,7 e 6,9 - 9,8. Os conteúdos em fenóis totais e os valores FRAP (mg EAG e μmoles de eq. Trolox/ 100 g framboesa fresca, respetivamente) apresentavam-se, em média, entre 96,2 - 124,1 e 722,5 -1011,1 (para os GFV), 104,6 e 899,3 (para o GFA) e 151,4 -202,3 e 1113,6 - 1436,2 (para as Cv).
No futuro, seria desejável que os programas de melhoramento de framboesa incluíssem parâmetros relativos a compostos bioativos, nomeadamente elagitaninos e antocianinas.
Raspberry production in Portugal is currently of great economic interest to farmers, especially in the Alentejo Litoral and Algarve. Raspberries are nutritionally dense fruits rich in bioactive compounds. The ingestion of these fruits has been associated with beneficial physiological effects, in addition to nutritional ones. In 2018, the INIAV, IP and the Beira Baga company started a small genetic improvement program aimed at supplying all growers with raspberry cultivars. This work comprised a narrative review (2011-2021) on the beneficial health effects of raspberry polyphenols with antioxidant activity and the determination of moisture content, Brix degree, total phenol content and in vitro antioxidant activity (FRAP method) of 5 red raspberry (GFV) and 1 yellow raspberry (GFA) genotypes, selected under the aforementioned breeding program, and 4 red raspberry (Cv) cultivars. In the narrative review, articles were found on various topics related to health (metabolic syndrome, neurodegenerative diseases, photoaging), which allege benefits to health, especially as a result of raspberry polyphenols. Some articles report intervention studies in humans, namely randomized and controlled studies and bioavailability studies. The data obtained for the different samples are within the published values for the raspberry. The average results obtained for the moisture content and the Brix degree ranged between 87.4 - 90.7 and 6.9 - 9.8. The total phenol contents and the FRAP values (mg EAG and μmoles of Trolox eq./100 g fresh raspberry, respectively) were, on average, between 96.2 - 124.1 and 722.5 -1011.1 (for GFVs, 104.6 and 899.3 (for GFA) and 151.4 -202.3 and 1113.6 - 1436.2 (for Cv). In the future, it would be desirable for raspberry breeding programs to include parameters related to bioactive compounds, namely ellagitannins and anthocyanins.
Raspberry production in Portugal is currently of great economic interest to farmers, especially in the Alentejo Litoral and Algarve. Raspberries are nutritionally dense fruits rich in bioactive compounds. The ingestion of these fruits has been associated with beneficial physiological effects, in addition to nutritional ones. In 2018, the INIAV, IP and the Beira Baga company started a small genetic improvement program aimed at supplying all growers with raspberry cultivars. This work comprised a narrative review (2011-2021) on the beneficial health effects of raspberry polyphenols with antioxidant activity and the determination of moisture content, Brix degree, total phenol content and in vitro antioxidant activity (FRAP method) of 5 red raspberry (GFV) and 1 yellow raspberry (GFA) genotypes, selected under the aforementioned breeding program, and 4 red raspberry (Cv) cultivars. In the narrative review, articles were found on various topics related to health (metabolic syndrome, neurodegenerative diseases, photoaging), which allege benefits to health, especially as a result of raspberry polyphenols. Some articles report intervention studies in humans, namely randomized and controlled studies and bioavailability studies. The data obtained for the different samples are within the published values for the raspberry. The average results obtained for the moisture content and the Brix degree ranged between 87.4 - 90.7 and 6.9 - 9.8. The total phenol contents and the FRAP values (mg EAG and μmoles of Trolox eq./100 g fresh raspberry, respectively) were, on average, between 96.2 - 124.1 and 722.5 -1011.1 (for GFVs, 104.6 and 899.3 (for GFA) and 151.4 -202.3 and 1113.6 - 1436.2 (for Cv). In the future, it would be desirable for raspberry breeding programs to include parameters related to bioactive compounds, namely ellagitannins and anthocyanins.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Framboesa vermelha Compostos fenólicos Genótipo Atividade antioxidante (FRAP)