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Comparative Study
. 2020 Sep 25;75(9-10):319-325.
doi: 10.1515/znc-2020-0003.

Natural antioxidants in emulsions O/W

Soukaina El-Guendouz  1   2 , Smail Aazza  3 , Susana Anahi Dandlen  2 , Nessrine Majdoub  2 , Badiaa Lyoussi  1 , Sara Raposo  4 , Vera Gomes  5 , Vassya Bankova  6 , Milena Popova  6 , Dulce Antunes  7 , Maria Graça Miguel  2
Affiliations
Comparative Study

Natural antioxidants in emulsions O/W

Soukaina El-Guendouz et al. Z Naturforsch C J Biosci. .

Abstract

This study compared the capacity of propolis extract (PE) and thyme waste extract (TWE) to prevent the oxidation of oil in water (O/W) emulsion, as well as their impact on emulsion apparent viscosity (AV) in the presence of wheat germ and almond oils as lipid phase. For this, central composite design (CCD) and principal component analysis (PCA) were performed. Oxidation process was monitored by evaluating the formation of primary and secondary lipid oxidation products, at the same time the AV behavior was determined evaluating consistency index and flow behavior index. The results revealed that the increase of PE% and TWE% decreases TBARS (Thiobarbituric Acid Reactive Substances) and hydroperoxides formation. Viscosity increases with the rise of TWE% over (0.04%), whereas lower concentrations of PE% decreases it. Those results have been confirmed in the PCA analysis. TWE showed higher resistance to oxidation, although PE was more effective as antioxidant than TWE.

Keywords: TBARS; apparent viscosity; hydroperoxides; propolis; thyme.

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