| Registro completo |
| Provedor de dados: |
BJPS
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| País: |
Brazil
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| Título: |
Influence of preparation procedures on the phenolic content, antioxidant and antidiabetic activities of green and black teas
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| Autores: |
Almeida,Tânia Santos de
Araújo,Maria Eduarda Machado
Rodríguez,Lucía González
Júlio,Ana
Mendes,Beatriz Garcia
Santos,Rui Miguel Borges dos
Simões,José Artur Martinho
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| Data: |
2019-01-01
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| Ano: |
2019
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| Palavras-chave: |
Black tea
Green tea
Antioxidant activity
Α-Glucosidase activity
Water mineralization
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| Resumo: |
The influence of common tea preparation procedures (temperature, infusion time, consumption time interval and tea bag/loose-leaf) and the type of water used, on the total phenolic content (TPC), the radical scavenging activity and the α-glucosidase inhibitory activity were assessed. Higher TPC and antioxidant activity were obtained when using lower mineralized waters. Tea bags also evidenced higher antioxidant activity than loose-leaf samples. Under the same conditions (90 ºC and five minutes of infusion time) green tea contains almost twice the quantity of polyphenols and the free radical scavenging ability of black tea. In the α-glucosidase assay all infusions were active (97-100 %). Furthermore, HPLC allowed to identify some of the polyphenols present in both teas and to monitor their composition change with time. After twenty-four hours, the antioxidant activity was maintained without significant changes, but a small decrease in enzyme inhibition was observed, although this activity was still very high.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502019000100529
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| Editor: |
Universidade de São Paulo, Faculdade de Ciências Farmacêuticas
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| Relação: |
10.1590/s2175-97902019000117695
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| Formato: |
text/html
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| Fonte: |
Brazilian Journal of Pharmaceutical Sciences v.55 2019
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| Direitos: |
info:eu-repo/semantics/openAccess
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