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N-nitrosamines in Chinese foods
1Department of Nutrition and Food Hygiene, Beijing Medical University, People's Republic of China.
Summary
Volatile N-nitrosamines were detected in various Chinese foods, including beer, meat, seafood, milk, and pickled vegetables. N-Nitrosodimethylamine (NDMA) was commonly found, with high levels in some seafood samples.
Area of Science:
- Food Chemistry
- Analytical Chemistry
- Toxicology
Background:
- Volatile N-nitrosamines are a group of compounds with potential carcinogenic properties.
- Their presence in food is a public health concern.
- Chinese foods represent a diverse range of dietary items where these compounds may be present.
Purpose of the Study:
- To investigate the occurrence and levels of volatile N-nitrosamines in a variety of Chinese foods.
- To identify specific N-nitrosamines and their concentrations in different food categories.
- To assess potential dietary exposure risks associated with these contaminants.
Main Methods:
- Gas chromatography-thermal energy analysis (GC-TEA) was employed for the primary analysis.
- Gas chromatography-mass spectrometry (GC-MS) was used for confirmation of high levels in seafood.
- A total of 695 Chinese food samples and 10 malt samples were analyzed.
Main Results:
- N-Nitrosodimethylamine (NDMA) was detected in 146 of 176 beers (0.1–6 ppb) and 201 of 271 meat products (0.1–7.4 ppb).
- Seafood samples showed high NDMA levels, reaching up to 131.5 ppb.
- Milk products, flavourings, and pickled vegetables also contained various nitrosamines, including N-nitrosopyrrolidine (NPYR) and N-nitrosopiperidine (NPIP), at varying concentrations.
Conclusions:
- Volatile N-nitrosamines, particularly NDMA, are prevalent in a wide array of Chinese foods.
- Seafood and meat products are significant sources of NDMA.
- Further research is warranted to understand the formation mechanisms and long-term health implications of nitrosamine exposure from these food sources.