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Mutagens in Coffee and Other Beverages

Minako Nagao, Yuki Fujita, Keiji Wakabayashi, Haruo Nukaya, Takuo Kosuge and Takashi Sugimura
Environmental Health Perspectives
Vol. 67 (Aug., 1986), pp. 89-91
DOI: 10.2307/3430321
Stable URL: http://www.jstor.org/stable/3430321
Page Count: 3
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Mutagens in Coffee and Other Beverages
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Abstract

A cup of coffee contains mutagens which produce about 5× 104-105 revertants of Salmonella typhimurium TA 100 without S9 mix. One of the mutagens was identified to be methylglyoxal. Methylglyoxal was present in various beverages such as black tea, whisky, and brandy. Methylglyoxal itself induced tumors in rats when administered by subcutaneous injection. However, the mutagenic properties of coffee were different from those of methylglyoxal. The mutagenicity of coffee was suppressed by catalase, and coffee was found to contain hydrogen peroxide. Furthermore, coffee solution was found to have a hydrogen peroxide-generating system. Instant coffee (15 mg/mL) contains 130 μM hydrogen peroxide immediately after the dissolution of coffee powder in water at room temperature. The concentration of hydrogen peroxide increased with time. The mutagenicity of methylglyoxal was increased by the copresence of hydrogen peroxide. A maximum of 30-fold enhancement was observed. The mutagenicity of black tea but not that of whisky was suppressed by catalase.

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