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