Application of mutagenicity test for milk

Area of Science:

• Food safety and toxicology
• Molecular biology and genetics

Background:

• Milk and dairy products are staple foods globally.
• Assessing potential mutagenicity in food is crucial for public health.
• Previous studies on milk mutagenicity are limited.

Purpose of the Study:

• To investigate the presence of mutagenic activity in milk and milk products.
• To characterize the mutagenic potential using the Salmonella mammalian-microsome mutagenicity test (Ames test).

Main Methods:

• Utilized the Salmonella mammalian-microsome mutagenicity test (Ames test).
• Tested heat-sterilized milk samples.
• Employed the S-9 fraction of microsomes for metabolic activation.
• Analyzed chloroform extracts of milk for mutagenic compounds.

Main Results:

• Positive mutagenic results were observed in heat-sterilized milk, particularly after S-9 activation.
• A significant increase in His+ revertants (more than double the spontaneous rate) was recorded.
• Mutagenic activity was detected in the chloroform extract of milk, suggesting a lipophilic nature.

Conclusions:

• Heat-sterilized milk contains mutagenic activity detectable by the Ames test.
• The mutagenic compound requires metabolic activation for full expression.
• Further research is needed to chemically identify the mutagenic substance in milk.