ArticleAntioxidants (Basel, Switzerland)2024
From Spent Black and Green Tea to Potential Health Boosters: Optimization of Polyphenol Extraction and Assessment of Their Antioxidant and Antibacterial Activities.
Article in Antioxidants (Basel, Switzerland), 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Ultrasound-Assisted Extraction of Antioxidant Polyphenols from Zheng'an White Tea: Process Optimization and Bioactivity.Foods (Basel, Switzerland) · 2026Article
- Unveiling of phytochemicals, antioxidants, cytotoxic effects and anthelmintic potency of green tea (Camellia sinensis) beverage against albendazole resistant Hamonchus contortus.Scientific reports · 2026Article
- Valorization of Onion By-Products and Assessment of Their Biological Activities.Foods (Basel, Switzerland) · 2026Article
- Optimized extraction of polyphenols from rooibos tea (Frontiers in nutrition · 2026Article
- Valorization of Hazelnut (Antioxidants (Basel, Switzerland) · 2025Article
- Dietary polyphenols and human health: sources, biological activities, nutritional and immunological aspects, and bioavailability- a comprehensive review.Frontiers in immunology · 2025Review
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Authors and funding
8 authors.
Funding
Abstract
Tea, one of the most popular beverages worldwide, generates a substantial amount of spent leaves, often directly discarded although they may still contain valuable compounds. This study aims to optimize the extraction of polyphenols from spent black tea (SBT) and spent green tea (SGT) leaves while also exploring their antioxidant and antibacterial properties. Response surface methodology was utilized to determine the optimal experimental conditions for extracting polyphenols from SBT and SGT. The total phenolic content (TPC) was quantified using the Folin-Ciocalteu method, while antioxidant activity was evaluated through the DPPH assay. Antibacterial activity was assessed using the disk diffusion method. Additionally, high-performance liquid chromatography (HPLC) was employed to analyze the phytochemical profiles of the SBT and SGT extracts. Optimal extraction for SBT achieved 404 mg GAE/g DM TPC and 51.5% DPPH inhibition at 93.64 °C, 79.9 min, and 59.4% ethanol-water. For SGT, conditions of 93.63 °C, 81.7 min, and 53.2% ethanol-water yielded 452 mg GAE/g DM TPC and 78.3% DPPH inhibition. Both tea extracts exhibited antibacterial activity against Gram-positive bacteria, with SGT showing greater efficacy against
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