The antioxidative potential among tested “9:1 MIX-es” (Table 3),
was the highest for beetroot juice combined with blue-berried
honeysuckle juice. Next in line were the mixtures of beetroot
juice with sea buckthorn juice and mirabelle plum juice. As in the
case of “pH 3.5 MIX-es”, the lowest antioxidant potential was determined for the mixture of beetroot juice with citric acid solution.
Moreover, when combined in 1:9 proportion, 0.16 mol/L citric
acid solution reduced the own antioxidant activity of beetroot juice.
The storage of “9:1 MIX-es” for one week significantly decreased
the content of antioxidants, which in the case of samples containing
fruit juices was restored to some extent after subsequent week.