Dynamics of changes of biologically active substances in the fruit of different species of hawthorn Crataegus L. depending on storage conditions

Crataegus pentagyna Waldst. et Kit. ex Willd. and C. caucasica K. Koch when the fruits of the species are stored frozen after 6 months, the amount of vitamin C increases by 20-25%, catechins by 45-55%, carotenoids by 20-25%, flavonoids by 5-10%, leucoanthocyanins by 30-35%, chlorogenic acid is reduced by 8-10%, anthocyanin is increased by 6-10%. The amount of biologically active substances is reduced by 20-25% when drying fruits in different ways, with fixation at 120°C, 20°C, 70°C and without fixation at 20°C, 70°C. The best drying methods are vacuum and freeze drying. When drying by this method, the loss of biologically active substances is 5-8%.