RESUMO
The quality and safety of food, intended for baby in particular, is one of the global issues of our time. The group of carcinogenic N-nitrosamines is of especially dangerous. It is worth mentioning that currently there are no standards for their content in Vietnam. Therefore, to ensure the chemical safety of infant food, it is necessary to improve the control system, including the development of modern technical and methodological base. The aim of the research is the comparative assessment of contamination with highly toxic, N-nitrosoamines of baby canned meat and vegetable products by the gas chromatography-mass spectrometry (GC/MS) using an automatic solid-phase extraction system and gas chromatography-tandem mass spectrometry (GC-MS/MS). Material and methods. The objects of research were homogenized canned meat-vegetable products for baby nutrition - 21 samples taken from the distribution network of the Republic of Vietnam: vegetables and rice with chicken (sample No. 1); sweet corn with mashed potatoes and turkey (sample No. 2); potatoes with veal (sample No. 3); each species has 7 samples. Each food sample was analyzed thrice by two methods. At the Federal Center of Perm, the screening studies of canned foods were performed using GC/ MS with application of the automatic solid-phase extraction system (SPE) after distillation using alkaline catalysis at the sample preparation stage. At the National Institute of Food Control of Republic of Viеtnam, canned samples were studied using GC-MS/MS. The extraction method was developed on the base of QuEChERS-approach. Results and discussion. During the research, the following chemical contaminants were found in the canned samples: N-nitrosodimethylamine, N-nitrosodiethylamine, N-methylethyl nitrosoamine, N-dipropylnitrosoamine, N-dibutyl nitrosoamine, N-piperidinitrozoamine, N-pyrrolidinin nitrosoamine, N-morpholinithrosamine and N-diphenyl nitrosoamine. It was demonstrated that the results of quantitative determination of the content of N-nitrosoamines in canned meat of Vietnam producers obtained in different laboratories are comparable and have good validation characteristics for the determination of N-nitrosoamines in baby food. Thus, N-nitrosodimethylamine was detected by both methods in all analyzed samples in the concentration range from 0.00045 to 0.00077 mg/kg. Values exceeding the maximum permissible level of N-nitrosoamines (N-nitrosodimethylamine and N-nitrosodiethylamine) in canned meat and vegetable samples (0.001 mg/kg according to Technical Regulations of the Customs Union TR TC 021/ 2011 "On Food Safety") were not found. The application of low-resolution gas chromatography-mass spectrometry and the use of an automatic SPE system made it possible to achieve high comparability of the results in chemical analysis of N-nitrosoamines in canned products obtained in the laboratory of the Center and the National Institute for Food Control of Vietnam. Conclusion. The executed studies indicate the need for further monitoring of the content of chemicals in baby products in order to justify methodological approaches to the analysis of the risk of the simultaneous effect of chemical contaminants on the health of children. In this regard, it seems extremely important and relevant issue of hygienic regulation of the content of the studied compounds in products for baby food.
