Introduction. Plant raw materials can be a source of biologically active substances and increase the nutritional value of food products. The present research objective was to determine the content of biologically active substances in powdered viburnum and barberry. Study objects and methods. The study featured viburnum (Viburnum opulus L.) and barberry (Berberis vulgaris L.), dried by convection and crushed into particles of 50 microns. Results and discussion. The total content of phenolic compounds in powdered viburnum was 3114.07 mg/100 g, in powdered barberry – 2272.7 mg/100 g. The content of flavonoids in powdered viburnum was 324.52 mg/100 g, in powdered barberry – 390.00 mg/100 g. The flavonoid profile of the powders included rutin, hyperoside, quercitrin, isoquercintrin, and astralagin. The total content of catechins was 446 mg/100 g for viburnum and 506 mg/100 g for barberry. The catechins included mainly epigallocatechin and catechin. In powdered viburnum, the catechin composition was as follows: epicatechin – 196, catechin – 118, and epigallocatechin – 89 mg/100 g; in powdered barberry: epigallocatechin – 173, catechin – 111, and epicatechin – 74 mg/100 g. The antiradical activity in relation to trolox equivalent was 7560 mg/100 g in powdered viburnum and 9460 mg/100 g in powdered barberry. Conclusion. The obtained viburnum and barberry powders can fortify food with biologically active substances and expand the range of functional products.

The objects of the study were the fruits of viburnum vulgaris (Viburnum opulus L) and barberry (Berberis vulgaris). Powders were obtained from fresh viburnum and barberry fruits by convective drying. The lipid complex of powders from viburnum and barberry fruits was studied. The total content of lipids in barberry powder was determined to be 7.6%, and in viburnum powder–7.1%.The group composition of lipids of powders, which is represented by neutral and polar lipids, was examined. The main part of lipids is triglycerides. Unsaturated fatty acids (LC) predominate in the composition of lipids of powders. Barberry powder contains essential fatty acids, such as linoleic–35.54% and linolenic–35.60%, which indicates a high biological efficiency of barberry lipids, viburnum powder has 46.56 % of oleic acid and 46.14 % of linoleic acid. The fractional composition of sterols of viburnum and barberry powders was studied. It was revealed that the fractional composition of viburnum powder sterols contains more fractions than the sterols of barberry powder.7 fractions were identified in the composition of viburnum powder sterols: campesterol, beta-sitosterol, beta-amyrin, stigmasta-5.24(25) - dien-3-ol, alpha-amyrin, cycloartenol, citrostadienol. The predominant fractions are alpha-amyrin, beta-amyrin, and beta-sitosterol. 3 fractions were identified in the composition of barberry powder sterols: campesterol, beta-sitosterol, delta-5-avenasterol, the main fraction is beta-sitosterol.

The analysis of methods for determining the glycemic index (GI) of food products in vivo and in vitro. The authors note that the difference in the methodological approach to the determination of GI in vitro leads to obtaining results that are difficult to compare. A modified method for determining the GI for glucose is proposed, which is based on the method for determining the glycemic index for glucose, which makes it possible to assess the digestibility of various ingredients in products in terms of sugar load, and to calculate the glycemic index for glucose formed in the process of "digestion” of the test product in vitro. The modified technique provides for the use of digestive enzyme preparations: Acedin-pepsin and Panzinorm to provide a deeper "digestion” in vitro, providing a deep degree of hydrolysis of the main macronutrients in in vitro model experiments. The conditions for carrying out enzymatic hydrolysis reactions (temperature, pH, reaction duration) were selected experimentally. The studies carried out to determine the GI in vitro, according to the proposed method, showed comparable values, which indicates the possibility of using this method for the determination of GI in vitro. The results obtained should be considered as indicative, since the authors adhere to the position that the true value of the GI index can only be determined by blood analysis. But in this case, the value of GI is influenced by many factors, including the individual characteristics of the human organism.

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