N-nitrosodimethylamine, nitrate and nitrate-reducing microorganisms in human milk

Area of Science:

• Environmental Health
• Toxicology
• Human Physiology

Background:

• Volatile N-nitrosamines are potential carcinogens.
• Human milk is a critical source of nutrition for infants.
• Endogenous formation of N-nitrosamines is a growing concern.

Purpose of the Study:

• To investigate the presence of volatile N-nitrosamines in human milk.
• To determine the levels of N-nitrosodimethylamine in breast milk.
• To assess the potential for endogenous N-nitrosamine formation in nursing mothers.

Main Methods:

• Analysis of 54 human milk samples from healthy nursing women.
• Quantification of volatile N-nitrosamines using analytical techniques.
• Measurement of nitrate and nitrate-reducing microorganisms in milk samples.

Main Results:

• 42 out of 54 milk samples were negative for volatile N-nitrosamines.
• N-nitrosodimethylamine was detected in 10 samples at trace levels (below 0.5 µg/L).
• Two samples contained N-nitrosodimethylamine at 1.1 and 1.2 µg/L.
• All samples contained nitrate and nitrate-reducing microorganisms.

Conclusions:

• The presence of N-nitrosodimethylamine in human milk suggests endogenous formation.
• Nitrate and microbial activity in milk may contribute to N-nitrosamine synthesis.
• Further research is needed to understand the implications for infant health.