ArticleScientific reports2023
Effects of tea, catechins and catechin derivatives on Omicron subvariants of SARS-CoV-2.
Article in Scientific reports, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed, 13 citations in OpenAlex.
- Effects of Green Tea Gargling on COVID-19: A Multicenter RCT.AJPM focus · 2026Article
- Beyond Composition: Processing-Driven Transformations and Functional Trade-Offs of Matcha Tea in Foods.Foods (Basel, Switzerland) · 2026Review
- Dose-dependent antiviral effects of glycyrrhizin, curcumin, and harmaline against clinical SARS-CoV-2 isolates, including D614G, Omicron BA.5, and Omicron XBB.1.BMC complementary medicine and therapies · 2026Article
- Galloylated polyphenols represent a new class of antithrombotic agents with broad activity against thiol isomerases.Journal of thrombosis and haemostasis : JTH · 2025Article
- Diverse Structures of Tea Polyphenols from Rougui Wuyi Rock Tea and Their Potential as Inhibitor of 3C-like Protease.Molecules (Basel, Switzerland) · 2025Article
- Comparative analysis of COVID-19 responses in Japan and Africa: diet, phytochemicals, vitamin D, and gut microbiota in reducing mortality-A systematic review and meta-analysis.Frontiers in nutrition · 2024Article
- Natural products as a source of Coronavirus entry inhibitors.Frontiers in cellular and infection microbiology · 2024Review
- Possible roles of phytochemicals with bioactive properties in the prevention of and recovery from COVID-19.Frontiers in nutrition · 2024Article
Corrections and comments
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Authors and funding
14 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The Omicron subvariants of SARS-CoV-2 have multiple mutations in the S-proteins and show high transmissibility. We previously reported that tea catechin (-)-epigallocatechin gallate (EGCG) and its derivatives including theaflavin-3,3'-di-O-digallate (TFDG) strongly inactivated the conventional SARS-CoV-2 by binding to the receptor binding domain (RBD) of the S-protein. Here we show that Omicron subvariants were effectively inactivated by green tea, Matcha, and black tea. EGCG and TFDG strongly suppressed infectivity of BA.1 and XE subvariants, while effect on BA.2.75 was weaker. Neutralization assay showed that EGCG and TFDG inhibited interaction between BA.1 RBD and ACE2. In silico analyses suggested that N460K, G446S and F490S mutations in RBDs crucially influenced the binding of EGCG/TFDG to the RBDs. Healthy volunteers consumed a candy containing green tea or black tea, and saliva collected from them immediately after the candy consumption significantly decreased BA.1 virus infectivity in vitro. These results indicate specific amino acid substitutions in RBDs that crucially influence the binding of EGCG/TFDG to the RBDs and different susceptibility of each Omicron subvariant to EGCG/TFDG. The study may suggest molecular basis for potential usefulness of these compounds in suppression of mutant viruses that could emerge in the future and cause next pandemic.
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