2.4. Accelerated functional stability of quercetin
The stability test was performed according to the World Health Organization. Firstly, the possible interferences of the formulations constituents were evaluated using the DPPH•assay (seeSection2.2).The raw material was diluted in propyleneglycol (5000g/mL).This solution was diluted100-foldinethanol, to obtain quercetin concentration of 50g/mL of which 50L were utilized for the reaction(1g/mL).