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Optimisation of Beetroot Juice Encapsulation by Freeze-Drying
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Faculty of Technology, University of Novi Sad, Bulevar cara Lazara 1, 21000 Novi Sad, Serbia
Submission date: 2019-08-27
Final revision date: 2019-12-06
Acceptance date: 2019-12-09
Online publication date: 2020-02-12
Publication date: 2020-02-12
Corresponding author
Jelena J. Vulić   

Faculty of Technology, University of Novi Sad, Serbia
Pol. J. Food Nutr. Sci. 2020;70(1):25-34
Sensitivity of natural antioxidants could be improved using encapsulation technologies. In this study, encapsulation of beetroot juice (BJ) with soy proteins has been optimized in terms of the wall:core ratio, BJ dilution and mixing time of both components, maximizing DPPH radical scavenging activity (SA) and the encapsulation efficiency (EE) based on the total phenolics content. Multi response optimization has indicated that the optimal encapsulation is accomplished when soy protein is mixed with undiluted BJ at a wall:core ratio of 50 g/L for 9.8 min. Applying these conditions, the optimal encapsulate has been produced, where the contents of total phenolics, flavonoids and betalains were 150.71 mg GAE/100 g, 9.31 mg RE/100 g, and 521.28 mg/100 g, respectively, while EE and SA were in accordance with the values obtained by optimization, i.e. 92.48% and 1.01 mmol TE/100 g, respectively, confirming the validity of the optimization process. The resulting encapsulates have favorable physicochemical and functional characteristics and can be potentially applied as natural color additives.
This work was supported by the Ministry of Education, Science and Technological Development of Serbia under Grant no. TR31044.
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