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The richest chemical composition of honey determines its extremely high biological activity. The composition and concentration of bioactive compounds of honey largely depend on its botanical origin, i.e. they are determined by nectar and the pollen chemical composition of the nectariferous plant, on the soil on which they grow, as well as on climate and weather conditions. Along with enzymes and minerals, vitamins are found in honey in small but measurable amounts. Vitamins of honey are mainly represented by B-group vitamins. The content of vitamins in honey varies according to its botanical origin. The following types of honey were used for the study: acacia, sunflower, chestnut, linden, buckwheat. The quantitative determination of water-soluble B-group vitamins (thiamine, riboflavin, pyridoxine, pantothenic acid, nicotinic acid) in honey of various botanical origin was carried out in the accredited laboratory of the direction of chemical and biological research of beekeeping products of the Federal Research Center of Beekeeping by the method of capillary electrophoresis. It was revealed that chestnut and buckwheat honey present the highest levels of water-soluble vitamins content; that confirms the prospects of their use as a source of vitamins. Vitamins are unstable compounds that can be easily destroyed by various factors. Under the impact of daylight, the studied water-soluble vitamins contained in honey are destroyed during storage. The dynamics of changes in the vitamins content was traced during the storage of honey for 12 months in a dark place and in the light. Riboflavin andnicotinic acid, which is significantly reduced, is caracterized by a higher sensitivity to the action of daylight during storage of honey.

Water-soluble vitamins in honeys of various botanical origin and their change during storage of honey