Abstract
Vitamin deficiency among children in Russia is urgently issue. Chemical substances of technogenic origin are considered as a significant factor affecting the level of vitamin provision for children. The study aimed to analyze vitamin A, C, D, B6 and B12 level in the blood of 188 children aged 6 years attending pre-school educational institution located in the territory of a large industrial centre with determined concentration content of organic substances of technogenic origin (phenol, formaldehyde, ethylbenzene and chlorinated organic compounds) exceeding the hygienic standards in the ambient air, the air in pre-school educational institution and drinking water. Child diet was assessed. Besides, sampling and assessment of the quality of atmospheric air, indoor air and drinking water in pre-school educational institution were carried out. It was found that more than 75 % of children have a reduced level of vitamins in the blood, even under the provision of nutrition with vitamins at the level of physiological requirements and diet balance. The relation between the decrease in the vitamin level provision for children and high level of organic compounds in the blood of the children examined was revealed. A long-term intake of organic compounds with air and water leads to disorders of the antioxidant system, as evidenced by the decrease in the level of antioxidant enzymes (succinate dehydrogenase and glutathione peroxidase) and the level of total antioxidant activity of blood serum among children examined. Under chronic entering of chemical substances of technogenic origin and decrease in functional activity of the oxidative-antioxidant system enzyme link, the role of non-enzymatic reactions of antioxidant protection supported by vitamins increases that leads to their increased consumption. The vitamin deficiency is caused by their increased consumption under chronic toxicant load that requires a new approach when developing a set of measures aimed at preventing hypovitaminosis in children living under sanitary and hygienic disadvantage caused by the organic compound complex of technogenic origin in environmental objects. Key words: children; hypovitaminosis, chemical substances of technogenic
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