The objective of the study was to determine quality changes in strawberry juices stored at 4 °C during a period of 1, 2, and 3 months. Four (4) juice variants were prepared: (1) without mash maceration; (2) without mash maceration and with the addition of taxifolin; (3) after mash maceration using a Panzym BE enzymatic preparation; and (4) after mash maceration using a Panzym BE enzymatic preparation with taxifolin. In the juices studied, the contents of the following components were determined: total polyphenolic, anthocyanins, catechins, vitamin C; the antioxidant activity was also analysed. The juice after mash maceration and without any additions was characterized by the highest total content of anthocyanins (47.07 mg/100 ml); the juice after mash maceration and with the addition of taxifolin had the highest content level of vitamin C (11.73 mg/100 ml). Furthermore, this juice (after mash maceration and with taxifolin) had the highest content of polyphenols and catechin (194.1 mg/100 ml and 17.9 mg/100 ml, respectively). Among the juices studied, the highest antioxidant activity (14.4 µmol Troloxu/ml) was found in the juices after mash maceration and with taxifolin added. While storing the juices analyzed for 3 months, it was also found that the contents of anthocyanins, catechins, vitamin C, and total polyphenols were reduced, and this fact had an effect of a lower antioxidant activity. The degradation rate of components and the decrease in the antioxidant properties were most intense during the first month of storing the juices.
strawberry, juices, polyphenols, antioxidant activity, taxifolin