[Contamination of human milk with nitrates and nitrites]

Area of Science:

• Environmental Health
• Human Nutrition
• Analytical Chemistry

Context:

• Assessing human milk composition is crucial for infant nutrition and health.
• Industrial emissions can introduce environmental contaminants into the food chain.
• Colostrum, the first milk produced, provides vital nutrients and antibodies to newborns.

Purpose:

• To quantify nitrate and nitrite levels in colostrum from mothers potentially exposed to industrial nitrogen compounds.
• To compare these levels with a control group from an unexposed region.
• To evaluate the intake of nitrates and nitrites by breastfed neonates and compare it with established safety guidelines.

Summary:

• Human milk nitrates and nitrites were measured colorimetrically in colostrum from 59 women in the Puławy region, potentially exposed to industrial nitrogen compounds, and compared to 35 controls from Lublin.
• While the geometric mean concentrations of nitrates (2.83 mg/L vs. 2.76 mg/L) and nitrites (0.46 mg/L vs. 0.32 mg/L) were slightly higher in the exposed group, the differences were not statistically significant.
• The average daily intake of nitrates (0.12 mg/kg body weight) and nitrites (0.02 mg/kg body weight) by neonates did not exceed the Acceptable Daily Intake (ADI) levels set by the Joint Expert Committee of FAO/WHO.
• A statistically significant positive correlation was observed between maternal age and parity with nitrate content in colostrum (p < 0.001).

Impact:

• The study suggests that colostrum in the studied region contains low amounts of nitrates and nitrites, posing no immediate health risk to breastfed neonates based on current ADI.
• Findings contribute to understanding the potential impact of industrial pollution on human milk composition and infant nutrition.
• Highlights the need for continued monitoring of environmental contaminants in breast milk, especially in industrialized areas.