Content of vitamins and mineral substancеs in enriched milk

Abstract

The enrichment of food products of industrial production in order to replenish vitamin and mineral deficiency is an actual trend in optimizing the diet of adults and children. Enriched milk as a healthy food is in constant demand. In this regard, monitoring the content of nutrients declared by the manufacturer in fortified milk and identification of its assortment is an important task. The aim of the research was assessment of the content of vitamins and mineral substances as micronutrients that form a balanced diet, in enriched milk marketed in Kemerovo. Material and methods. The content of micronutrients declared by the manufacturer in the information on the individual product label has been determined: vitamins C and B1; mineral substances (calcium, iron, iodine, zinc) in 10 samples of fortified drinking milk with a fat content of 2.5% from different manufacturers. Iron was determined by colorimetric method based on measuring the color intensity of red solution of a complex compound of divalent iron with ortho-phenanthroline. The content of zinc and iodine was determined by inversion voltammetry, the content of calcium and ascorbic acid by titrimetric method, the content of thiamine by the voltammetric method. Results and discussion. The actual content of ascorbic acid in fortified milk was in the range from 6 to 12 mg/100 g, thiamine - from 0.10 to 0.20 mg/100 g, which corresponded to their declared amount. The content of calcium varied from 99 to 155 mg per 100 g, iron - from 1.4 to 1.7 mg per 100 g, zinc - from 0.7 to 1.5 mg per 100 g, iodine - from 94.0 up to 151.0 mcg/kg. The compliance of the declared mineral substances in fortified milk has been confirmed. It has been shown that due to the consumption of 200 ml of product, the daily physiological requirement for the analyzed vitamins and minerals for adults will be: for vitamins C and B1 on average 13-26%; calcium - 18-31%; iron - from 14-18% for women to 28-34% for men; zinc - 12-25%; iodine - 12-20%. Conclusion. It was found that all samples of fortified milk corresponded to the declared characteristics for the content of vitamins and mineral substances. Regular consumption of fortified milk will improve the supply with essential micronutrients in the residents of the Kuzbass region.