2.1. Preparation and extraction of aqueous extract
To prepare the aqueous extract of Salvia officinalis , 6 g of the dried part of the mill was poured into 150 ml of boiling water and boiled for ten minutes. Then the extract was allowed to cool down gradually. After complete cooling, the resulting extract was clarified by a high-speed centrifuge (20,000 rpm) for 15 minutes. The resulting sample was wrapped in aluminum foil and kept in the refrigerator.