2.2. Formulations
For the chemical stability study, gel formulation containing R.
kordesii petal extract with final concentration of 0.1% (w/w)
and 1.5% (w/w) of carbomer 973 was prepared. All formulations
were stored in well-closed dark glass flasks and were
compounded fresh for all studies. The concentration was the
minimal active antioxidant concentration. A formulation was
prepared with the addition of active ingredient % (w/w) which
is shown in Table 1.