The determination of sunny day for photolytic degradation
studies was done using quinine chemical actinometry method
studied by ICH [22,23] and USFDA [24] working groups. The
referred method was slightly modified in terms to dissolve it.
The stock solution of Quinine was prepared in solvent medium
containing water: methanol in the ratio of 90:10, respectively,
instead of water alone. The day of photo-degradation study was
declared to be “sunny” as the difference in the absorbance of
control (AC) and test (AT) was 1.012 (Limit: ΔA should be more
than 0.9).