juices prevents degradation of betalains. In the case of “pH 3,5 MIXes”,
the decrease of betalain content after both storage periods was
also observed. The protective effect of added fruit based acidity
regulators on betalains in these samples was assessed by comparison
of MIX-es with control samples in which the potential acidity
regulators were replaced with deionized water. It has been shown
in the case of “pH 3,5 MIX-es” (Table 4), that the decrease of
betalain content depended not only on the kind of added acidity
regulator, but also on its amount which determined pH of the final
mixture. As mentioned before, it is well known that betalains are
more stable in low pH environment, so the observed protective
effect of fruit based acidity regulators may be explained in terms of
the optimal pH level.