VITAMIN VALUE AND SAFETY OF KEFIR ENRICHED WITH FRUITS AND BERRIES
The research was conducted in 2021 on the basis of the laboratory of the Department of Technolo-gy of Storage and Processing of Agricultural Products of the I. A. Bunin Yelets State University. The aim of the research was to find out the comparative effect of adding some fruits and berries on the vitamin value of kefir. As the main raw material for the experiment, drinking pasteurized milk was used according to the state standard 31450-2013. Cranberry berries were used frozen from the retail chain, the rest were collected in the Yelets district and frozen before the start of the experiment. Of all the berries used, only cranberries and mountain ash did not worsen the organo-leptic parameters of kefir. Judging by the acidity of kefir, the shelf life of the control sample and with cranberries was the longest – 14 days. On the 12th day, the options with mountain ash and black currant went beyond the standard for acidity. The shelf life of kefir with sea buckthorn fruits was only 9 days. The addition of fruits and berries to kefir increased the content of biologically active substances in it: rowan-dry substances, carotenoids and flavonols, and black currant-coloring substances and anthocyanins. Taking into account the organoleptic indicators, the shelf life for acidity and the content of useful substances in kefir, it is necessary to single out the option with the addition of rowan fruits as the most successful.