The general approach of the suggested test is selective adsorption
of synthetic dyes in a test system resulting in color changes in a
drink sample.
In particular, the main component of the test system was suggested
to be a specifically developed adsorbent that provides an
adsorption of synthetic food dyes and substantially does not
interact with natural dyes of drinks.
Different polymeric adsorbents meeting this criterion were tested.
The test samples were divided into two groups: N - natural
red wines and juices; S - model drinks made by addition to white
wine or apple juice the predetermined amount of synthetic dyes to
give the same color characteristics, i.e. intensity (I) and tint (T) as
measured for the drinks of the first group.
The exemplified compositions of natural drinks (N1eN3) and
drinks containing synthetic dyes (S1eS3), the total amounts of dyes
as well as the color intensity and tint of such drinks are presented in