Sensory and chemical evaluation of tea brews prepared with the assistance of ultrasound
AUTOR(ES)
Kowalski, Radosław
FONTE
Cienc. Rural
DATA DE PUBLICAÇÃO
07/10/2019
RESUMO
RESUMO: O objetivo do estudo foi verificar a atividade sensorial e fitoquímica (polifenóis, flavonóides e cafeína) de infusões de chá preto e verde empregando o ultrassom. As infusões produzidas com a aplicação de sonicação por 2 e 1 minutos foram as mais preferidas pela equipe de avaliação sensorial. A avaliação das infusões em termos de descritores de componentes, isto é, fragrância, sabor e cor, foi variada e dependeu dos tipos de chás e dos fatores experimentais aplicados. Foi demonstrado que o ultrassom tem um efeito significativo na extração de substâncias ativas, ou seja, polifenóis, flavonóides e cafeína, do chá preto e verde. A aplicação de sonicação causou um aumento significativo na concentração de flavonóides (em cerca de 29% e 73%), polifenóis (em cerca de 34% e 41%) e cafeína (em cerca de 51% e 60%) das infusões de chá.ABSTRACT: The aim of the study was to evaluate sensory and phytochemical (polyphenols, flavonoids and caffeine) estimation of black and green tea brews obtained in an alternative way through brewing with the assistance of ultrasound. Brews produced with the application of sonication for 2 minutes and 1 minute were the most preferred by the sensory evaluation team. Evaluation of the brews in terms of component descriptors, i.e. fragrance, flavour and colour, was varied and depended on the kinds of tea and on the applied experimental factors. It was demonstrated that ultrasound have a significant effect on the extraction of active substances, i.e. polyphenols, flavonoids and caffeine, from black and green tea. The application of sonication caused a significant increase in the concentration of flavonoids (by ca. 29% and 73%), polyphenols (by ca. 34% and 41%) and caffeine (by ca. 51% and 60%) in the tea brews.
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