Mutagens in coffee and other beverages.

Area of Science:

• Food Science
• Toxicology
• Biochemistry

Background:

• Coffee contains mutagens, including methylglyoxal, which is also found in other beverages.
• Methylglyoxal can induce tumors in rats upon subcutaneous injection.
• The mutagenic properties of coffee differ from those of pure methylglyoxal.

Purpose of the Study:

• To investigate the mutagenic components in coffee.
• To understand the role of hydrogen peroxide in coffee's mutagenicity.
• To explore the interaction between methylglyoxal and hydrogen peroxide.

Main Methods:

• Bacterial mutagenicity assays using Salmonella typhimurium TA 100.
• Identification of mutagens using chromatographic and spectroscopic techniques.
• Measurement of hydrogen peroxide concentration in coffee solutions.
• Assessment of catalase activity and its effect on mutagenicity.

Main Results:

• Coffee contains mutagens, producing significant revertants in Salmonella typhimurium TA 100.
• Methylglyoxal was identified as a coffee mutagen, also present in black tea, whisky, and brandy.
• Coffee's mutagenicity was suppressed by catalase, indicating the presence of hydrogen peroxide.
• Coffee solutions possess a hydrogen peroxide-generating system, with concentrations increasing over time.
• Hydrogen peroxide significantly enhanced the mutagenicity of methylglyoxal by up to 30-fold.
• Catalase suppressed the mutagenicity of black tea but not whisky.

Conclusions:

• Coffee's mutagenicity is influenced by a hydrogen peroxide-generating system.
• Hydrogen peroxide potentiates the mutagenic effects of methylglyoxal.
• The findings highlight a complex interplay of compounds contributing to the biological activity of coffee and other beverages.