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Caracterização farmacológica de diferentes partes da planta Vaccinium cylindraceum endémica dos Açores tendo em vista a sua valorização como alimento funcional e nutracêutico
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Abstract(s)
A elevada incidência nas sociedades industrializadas ocidentais de doenças relacionadas com distúrbios alimentares, está a conduzir a grandes mudanças nos padrões dietéticos da população em geral, levando a que haja um maior interesse por alimentos promotores de saúde.
Entre a grande variedade de alimentos naturais benéficos para a saúde humana, encontram-se os frutos vermelhos, nomeadamente o mirtilo (Vaccinium spp.), fruto muito conhecido quer pelo seu extraordinário poder antioxidante (atribuído sobretudo ao seu elevado teor e diversidade em compostos fenólicos), quer pelo seu sabor e aroma exóticos. De facto, o cultivo comercial deste fruto tem vindo a aumentar exponencialmente, em particular nos países da América do Sul, devido à extraordinária procura do mercado americano e europeu por este fruto fresco, seus subprodutos, ou produtos de valor acrescentado. Por outro lado, outras partes da planta do género Vaccinium, como por exemplo as folhas e os caules, embora menos conhecidas e estudadas do que o fruto, apresentam também propriedades antioxidantes que podem contribuir, em grande parte, para os efeitos terapêuticos que lhes são atribuídas.
Sendo o setor agrário relevante para a economia da Região Autónoma dos Açores, reveste-se de grande importância a investigação das propriedades antioxidantes do mirtilo endémico da região (Vaccinium cylindraceum) que se encontra escassamente estudado, apesar de pertencer ao género Vaccinium muito valorizado pelos seus potentes efeitos farmacológicos, nomeadamente antioxidantes, atribuídos à sua fitoquímica única e diversificada. Acresce o facto de que Portugal continental cultiva e comercializa mirtilos, com sucesso, já desde a década de 90, colocando o fruto no mercado europeu nos meses de Maio/Junho de cada ano, ou seja, antes dos demais concorrentes. O fruto comestível do mirtilo-silvestre dos Açores, se comprovado cientificamente como sendo um produto diferenciado, poderá também vir a competir, pela diferença, com os mirtilos produzidos na América e Europa.
Neste contexto, amostras de frutos, folhas e caules do mirtilo açoriano da ilha de São Miguel foram avaliadas, no presente trabalho, quanto ao seu potencial antioxidante, através do uso de diferentes ensaios antioxidantes (poder redutor, capacidade de sequestrar o radical DPPH, capacidade de sequestrar o radical anião superóxido, poder quelante e capacidade de inibição da oxidação lipídica pelo sistema β-caroteno/ácido linoleico) e da determinação do teor de compostos fenólicos (fenólicos totais, flavonóides totais e antocianinas totais). Para comparação do potencial antioxidante das amostras de V. cylindraceum foram analisadas, nas mesmas condições experimentais, amostras de fruto fresco maduro (comercial) de V. angustifolium, mirtilo selvagem de plantio biológico proveniente do norte do Canadá (Quebec), e de chá verde da Gorreana (Gorreana Hysson), da ilha de São Miguel (Açores), um poderoso antioxidante natural.
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ABSTRACT: The high incidence in Western industrialized societies of diseases related to eating disorders, is leading to major changes in dietary patterns of the general population, and consequently in a greater interest in promoting health food. Among the wide range of beneficial natural foods for human health, the red fruits are, in particular blueberry (Vaccinium spp.), well-known fruits by its extraordinary antioxidant power (attributed mainly to its high content and diversity in phenolic compounds), and for its taste and exotic aroma. In fact, the commercial production of this fruit has increased exponentially, particularly in South America countries, due to the extraordinary demand for the American and European markets by this fresh fruit, its by-products, or value-added products. On the other hand, other parts of the genus Vaccinium, such as leaves and stems, although less known and investigated than the fruit, also have antioxidant properties that can contribute largely to the therapeutic effects attributed to them. The local agrarian sector is relevant to the economy of the Azores islands, therefore it is important to investigate the antioxidant properties of endemic blueberry (Vaccinium cylindraceum) which is poorly studied, although belong to the Vaccinium genus that is highly valued for their potent pharmacological effects, including antioxidant properties, attributed to its unique and diverse phytochemical products. Moreover, Portugal (main land) produces and successfully sells blueberries since the 90´s, placing the fruit on the European market in the months of May/ June each year before the other competitors. The edible fruit of the Azorean wild blueberry, if proven scientifically as a better quality product, can also come to compete, in the future, with the blueberries produced in America and Europe In this context, samples of fruits, leaves and stems of the Azorean blueberry from São Miguel island were evaluated in this study, as to its antioxidant potential by using different antioxidant tests (reducing power, ability to scavenge the DPPH radical, capacity to scavenge superoxide anion radical, chelating power and ability to inhibit lipid oxidation by β-carotene system/linoleic acid) and determining the content of phenolic compounds (total phenolics, total flavonoids and total anthocyanins). In order to compare the antioxidant potential of V. cylindraceum (VC) samples, were analyzed, under the same experimental conditions, ripe fresh fruit samples of V. angustifolium (VA), biological commercial plantation of wild blueberry from northern Canada (Quebec), and green tea (Gorreana Hysson), a powerful natural antioxidant from São Miguel island (Azores). […]
ABSTRACT: The high incidence in Western industrialized societies of diseases related to eating disorders, is leading to major changes in dietary patterns of the general population, and consequently in a greater interest in promoting health food. Among the wide range of beneficial natural foods for human health, the red fruits are, in particular blueberry (Vaccinium spp.), well-known fruits by its extraordinary antioxidant power (attributed mainly to its high content and diversity in phenolic compounds), and for its taste and exotic aroma. In fact, the commercial production of this fruit has increased exponentially, particularly in South America countries, due to the extraordinary demand for the American and European markets by this fresh fruit, its by-products, or value-added products. On the other hand, other parts of the genus Vaccinium, such as leaves and stems, although less known and investigated than the fruit, also have antioxidant properties that can contribute largely to the therapeutic effects attributed to them. The local agrarian sector is relevant to the economy of the Azores islands, therefore it is important to investigate the antioxidant properties of endemic blueberry (Vaccinium cylindraceum) which is poorly studied, although belong to the Vaccinium genus that is highly valued for their potent pharmacological effects, including antioxidant properties, attributed to its unique and diverse phytochemical products. Moreover, Portugal (main land) produces and successfully sells blueberries since the 90´s, placing the fruit on the European market in the months of May/ June each year before the other competitors. The edible fruit of the Azorean wild blueberry, if proven scientifically as a better quality product, can also come to compete, in the future, with the blueberries produced in America and Europe In this context, samples of fruits, leaves and stems of the Azorean blueberry from São Miguel island were evaluated in this study, as to its antioxidant potential by using different antioxidant tests (reducing power, ability to scavenge the DPPH radical, capacity to scavenge superoxide anion radical, chelating power and ability to inhibit lipid oxidation by β-carotene system/linoleic acid) and determining the content of phenolic compounds (total phenolics, total flavonoids and total anthocyanins). In order to compare the antioxidant potential of V. cylindraceum (VC) samples, were analyzed, under the same experimental conditions, ripe fresh fruit samples of V. angustifolium (VA), biological commercial plantation of wild blueberry from northern Canada (Quebec), and green tea (Gorreana Hysson), a powerful natural antioxidant from São Miguel island (Azores). […]
Description
Dissertação de Mestrado, Tecnologia e Segurança Alimentar, 23 de março de 2017, Universidade dos Açores.
Keywords
Alimentos Funcionais Antioxidantes Compostos Bioactivos Mirtilo-Silvestre Oxidação Lipídica Vaccinium cylindraceum (Uva-da-Serra) Nutracêuticos Azorean Wild Blueberry Functional Foods Lipid Oxidation Nutraceuticals
Citation
Lima, Vera Catarina Branco Furtado. "Caracterização farmacológica de diferentes partes da planta Vaccinium cylindraceum endémica dos Açores tendo em vista a sua valorização como alimento funcional e nutracêutico". 2017. 101 p.. (Dissertação de Mestrado em Tecnologia e Segurança Alimentar). Ponta Delgada: Universidade dos Açores, 2016. [Consult. Dia Mês Ano]. Disponível em www:<http://hdl.handle.net/10400.3/4623>.