ArticleFrontiers in nutrition2026
Functional instant tea from black tea waste fiber: effects of extraction conditions on bioactive composition and
Article in Frontiers in nutrition, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Black tea processing generates large amounts of waste fiber that still retains considerable levels of bioactive compounds. In this study, black tea waste fiber was valorized for the production of instant tea powders, and the influence of extraction conditions on both bioactive composition and anticancer activity was investigated. Methods: Instant tea powders were produced using hot extraction (100 °C, 6 min) and cold extraction (25 °C, 2 h). Catechins, gallic acid, caffeine, theanine, theaflavin and thearubigins were quantified. Anticancer activity was evaluated by the MTT assay using prostate cancer cell lines (PC3, 22Rv1 and LNCaP), glioblastoma cell lines (U87MG and A172) and the breast cancer cell line MCF7. Results: Hot extraction resulted in significantly higher levels of catechins, condensed phenolics and theanine ( Discussion: These findings demonstrate that black tea waste fiber can serve as a valuable raw material for functional instant tea production and highlight the importance of extraction conditions in shaping both the bioactive profile and biological activity of instant tea products derived from tea processing residues.
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