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Related Experiment Video

Updated: Jul 6, 2026

The Lambda Select cII Mutation Detection System

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Published on: April 26, 2018

Genotoxicity studies on green tea catechin.

R Ogura¹, N Ikeda, K Yuki

¹Safety Science Research Laboratories, Kao Corporation, 2606 Akabane, Ichikai-Machi, Haga-Gun, Tochigi 321-3497, Japan.

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association

|April 3, 2008

Summary

Green tea catechins showed mixed results in genotoxicity tests. While in vitro assays indicated potential concerns, in vivo studies found no significant genotoxic effects, suggesting safety for consumers.

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Area of Science:

Pharmacology
Toxicology
Molecular Biology

Background:

Tea catechins are widely recognized for their health benefits.
Genotoxicity assessment is crucial for evaluating the safety of dietary compounds like green tea catechins.
Understanding the genotoxic potential informs risk assessment for human consumption.

Purpose of the Study:

To evaluate the genotoxic potential of a green tea catechin preparation.
To determine if green tea catechins pose a genotoxic risk using a battery of in vitro and in vivo assays.
To correlate genotoxicity findings with epidemiological data on tea consumption and cancer prevention.

Main Methods:

Bacterial reverse mutation assay (Ames test).
In vitro chromosomal aberration assay in Chinese hamster lung (CHL/IU) cells.
In vitro mouse lymphoma L5178Y/tk assay.
In vivo bone marrow micronucleus (MN) assay in mice and rats.

Main Results:

The Ames test showed no significant increase in revertant colonies.
Positive responses were observed in the in vitro chromosomal aberration and mouse lymphoma assays.
No significant increase in micronucleated polychromatic erythrocytes (MNPCE) was detected in vivo, even at high doses (2000mg/kg).

Conclusions:

Despite some positive in vitro findings, the in vivo genotoxicity studies indicate a lack of significant genotoxic concern for green tea catechins.
The results align with epidemiological data suggesting a chemopreventive role for tea catechins.
Green tea catechin is considered safe under anticipated conditions of use regarding genotoxicity.