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The article is devoted to the study of antioxidant activity (AOA) food ingredients (FI) containing fucoidan used as dressers bakery and dairy products, and evaluate their impact on the quality and persistence of the products. The use of FI possessing AOA in food production will ensure their functionality from the point of view of increasing the resistance of the body to noninfectious diseases. Objects of research were fucoidan from different manufacturers, as well as experimental samples of bread wheat and yoghurt-based products restored dry milk. Evaluation of antioxidant activity of FI based on fucoidan showed that the total concentration of antioxidants varies in significant range from (43,32 ± 0,2) to (69,17 ± 0,2) mg of ascorbic acid per 100 g was Also determined the effect of any FI on the organoleptic and physico-chemical quality parameters of bread and yogurt product in storage. The use of FI in the technology of bread contributes to the prolongation of periods of storage. Thus the deviation values increased humidity decreases by 1.3%, porosity – by 1.4%. In addition, we studied the temperature stability of fucoidan after baking bread. The residual content of his made up 0,196 ± 0.0015 mg/g when introducing 0.2 g. study of the effect of FI with fucoidan on the inhibition of the processes of molding bread confirmed the strong bactericidal properties of fucoidans, due to the high AOA. During storage of yoghurt for 120 hours was observed decrease in the activity of capacity operated of acidity that may be due to the action of FI.