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Published on: January 22, 2015
Complexes of dextran sulfate and anthocyanins from Vaccinium myrtillus: Formation and stability
Rima Klimaviciute1, Vesta Navikaite1, Valdas Jakstas2
1Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania.
Abstract:
To improve the stability and antioxidant activity of anthocyanins (ATC), complexes of dextran sulfate (DESU) and ATC extracted from Vaccinium myrtillus were formed during electrostatic interaction between sulfo groups of DESU and cationic moieties of ATC. At the optimal weight ratio DESU/ATC=0.4 g/g, the amount of ATC introduced into a complex depended on the total concentration of the reagents. About 1.7 g of ATC per g of DESU could be incorporated into a complex. The formation of DESU/ATC complexes was confirmed by HPLC and FT-IR spectroscopy. According to HPLC analysis, the amount of individual ATC incorporated into a complex varied from 73.7% in the case of malvidin-3-O-glucoside to 90.8% in the case of delphinidin-3-arabinoside.
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