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Chemistry and function of vegetable polyphenols with high molecular weights
1Faculty of Pharmaceutical Sciences, Okayama University, Tsushima, Japan.
Biofactors (Oxford, England)
|March 10, 2001
Summary
High molecular weight polyphenols (tannins) were studied. New ellagitannins from Myrtaceae and Elaeagnaceae species showed significant cytotoxicity against oral tumor cells and antibacterial activity against Helicobacter pylori.
Area of Science:
- Phytochemistry
- Pharmacology
- Natural Products Chemistry
Background:
- Polyphenols, particularly high molecular weight tannins, are significant bioactive compounds found in foods and beverages.
- Ellagitannins are a class of polyphenols with diverse biological activities.
Purpose of the Study:
- To review the structure and function of high molecular weight polyphenols (tannins).
- To identify and elucidate the structures of new oligomeric ellagitannins from Myrtaceae and Elaeagnaceae species.
- To evaluate the cytotoxic and antibacterial activities of these ellagitannins.
Main Methods:
- Spectroscopic and chemical methods for structure elucidation.
- In vitro assays to evaluate cytotoxicity against human oral tumor cell lines.
- Antibacterial assays against Helicobacter pylori.
Main Results:
- New oligomeric ellagitannins, eucarpanins and elaeagnatins, were identified.
- Macrocyclic dimer ellagitannins (oentothein B, camelliin B, woodfordin C) exhibited remarkable cytotoxicity against oral squamous cell carcinoma, inducing apoptosis.
- Monomeric ellagitannins (tellimagrandin I, stricitinin) showed potent antibacterial activity against Helicobacter pylori.
Conclusions:
- Ellagitannins from Myrtaceae and Elaeagnaceae possess significant cytotoxic and antibacterial properties.
- Specific ellagitannins demonstrate targeted anti-cancer effects and potent pathogen inhibition.