Study of antioxidant indicators of fruit and berry raw materials zoned in the Sverdlovsk region
Fruit and berry raw materials are a valuable source of nutrients and antioxidants in the diet of the population of the Sverdlovsk region [2]. The aim of the study is to determine the total antioxidant activity of the fruit and berry raw materials of the Ussury plum and thorn growing in the territory of the Sverdlovsk region. Generally accepted standard physic and chemical research methods were used. The material for the study was the fruits of the Ussury plum, represented by the following varieties: Pionerka, Dostoynaya, Ural’skie zori, Shelest, Gorlitsa, as well as thorn plum Sergo, Tagil, Iset’, Ermak growing in the Sverdlovsk Horticulture Breeding Station - a structural subdivision of the Ural Federal Agrarian Research Center - Ural Branch of the Russian Academy of Sciences in Ekaterinburg. Results. It is established that the growing fruit and berry raw materials in the Sverdlovsk horticulture breeding station can be an important source of antioxidant indicators. The largest values were shown by varieties of thorn plum: Iset’ - 52,404 mmol/l × eq, Ermak - 45,416 mmol/l × eq, Sergo - 32,748 mmol/l × eq, Tagil - 26,359 mmol/l × eq. Varieties of Ussury plum have lower antioxidant indicators. Thus, the antioxidant activity of the Dostoynaya late ripening variety is 23.993 mmol/l × eq, in the Pionerka variety - 21.644 mmol/l × eq. In the varieties Gorlitsa and Shelest of the average ripening period, the antioxidant activity is 18.776 mmol/l × eq, and 17.842 mmol/l × eq. The lowest index in the early ripening variety Ural’skie zori is 4,713 mmol/ l × eq. In addition, physic and chemical parameters such as acidity, mass fraction of reducing and total sugars were studied in all the presented varieties of Ussury and thorn plums, organoleptic indicators of fruits were given, the results of the sugar-acid index were presented. Scientific novelty. The new data obtained indicate that the use of fruit and berry raw materials growing in the Sverdlovsk Horticulture Breeding Station - a structural subdivision of the Ural Federal Agrarian Research Center - Ural Branch of the Russian Academy of Sciences in Ekaterinburg, in the future can be used as a promising source of functional and biologically active substances, antioxidants for the development of formulations, as well as for a more correct calculation of the nutritional value of diets in order to increase antioxidant activity.