Os chás são ricos em compostos com propriedades antioxidantes que devem ser preservadas em bebidas elaboradas a partir de seus extratos. Nesse estudo, a estabilidade de compostos fenólicos totais (CFT) e a capacidade antioxidante (CA) pelos métodos ABTS e FRAP foram avaliadas em formulações de chá mate e branco prontas para beber (sabores natural, limão e pêssego). As bebidas foram armazenadas por 8 semanas em frascos âmbar ou expostas à luz, em temperatura ambiente e analisadas a cada 2 semanas. O teor de CFT das formulações com chá mate no escuro e expostas à luz permaneceu estável durante o armazenamento. Para as formulações de chá branco expostas à luz, foi detectada uma queda de 24 a 31% nos teores de CFT ao final do armazenamento. Houve uma queda expressiva na CA avaliada por FRAP, nas formulações de chá, a partir de 2 semanas de armazenamento, na ausência e presença de luz. Pouca alteração na CA das bebidas avaliada pelo método ABTS foi observada no escuro, enquanto na luz houve queda de 31 a 44% para os chás mate e branco, respectivamente. Os chás prontos para beber, mesmo que envasados em embalagem âmbar, não foram estáveis com relação ao potencial de redução de ferro. Contudo, o conteúdo de CFT e a CA por ABTS foram preservados. Os compostos fenólicos e a CA, das formulações à base de chá branco e do mate são conservados desde que as bebidas sejam envasadas em frascos âmbar a temperatura ambiente, por no máximo duas semanas.
Teas are rich in antioxidant compounds and many ready-to-drink teas are being developed with great acceptance in the market. However, the bioactive potential for these products should be preserved during the storage. The aim of this work was to evaluate changes in total phenolic content (TPC) and antioxidant capacity (AC) from six formulations of green and black ready-to-drink teas, stored in the dark or exposed to light during eight weeks at room temperature. The stability was evaluated every two weeks by measuring TPC by Folin-Ciocalteu and AC by ABTS and FRAP assays. In the absence of light TPC of green tea remained stable throughout the storage, but it dropped after two weeks when exposed to light. TPC for black tea decreased after four and two weeks, in the absence and presence of light, respectively. The AC for green tea decreased after two weeks, in the presence of light, however the decay was greater for the FRAP assay. In the absence of light, changes in AC for black tea were observed only for samples assayed by FRAP after two weeks. A reduction in the AC (FRAP and ABTS) occurred after four weeks for both samples exposed to light. The results show that to retain the majority of their TPC and AC these tea drinks should be commercialized in opaque packages and stored for up to eight weeks.
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