Changes in the fermented dairy products quality for baby food during storage

The aim of the study is to investigate the integral antioxidant activity of fermented milk products for chil-dren's nutrition during storage. Objectives: to evaluate the IAA of fermented milk products for baby food of the Kazan manufacturer OAO Detskaya Molochnaya Kukhnya and to identify the dynamics of changes in this indicator during their storage; to evaluate the level of oxidative processes in these products and the content of available thiol groups of protein molecules of the studied samples. The object of the study is the range of fermented milk drinks for baby food of the Kazan manufacturer OAO Detskaya Molochnaya Kukhnya (Bioyogurt, Narine, Bifilife). The integral antioxidant activity was determined on the coulometric analyzer Expert-006 by galvanostatic coulometry using electrogenerated bromine, which covers almost all groups of antioxidants in the product sample, is express, has good reproducibility of measurement results, simplicity of instrumental execution, and high accuracy. Additionally, we studied the change in the content of available thiol groups of protein molecules in the samples under study (spectrophotometric method using 5,5'-dithiobis-(2-nitrobenzoic acid) reagent, which play a key role in oxidation-reduction processes and are one of the key components of the antioxidant system of fermented milk products, and lipid peroxi-dation using malonic dialdehyde registration (spectrophotometric method using thiobarbituric acid). During storage of the studied products, their antioxidant activity decreased, which was confirmed by a decrease in the amount of available sulfhydryl groups of milk proteins and an increase in the intensity of lipid peroxida-tion processes. The integral antioxidant activity of fermented milk drinks for nutrition of young children of the Kazan manufacturer OAO Detskaya Molochnaya Kukhnya was studied: Narine had the highest antiox-idant activity (99.35 mg/100 ml). The occurrence of oxidation processes during storage of fermented milk products, accumulation of malonic dialdehyde, has been established, which confirms the results obtained on their antioxidant activity. The fermented milk product Bioyogurt had the highest biological value and the lowest accumulation of toxic oxidation products at the end of the shelf life. The prospects of the integral antioxidant activity indicator measured by galvanostatic coulometry for assessing the quality of milk-based products have been shown.