The extract was filtered under vacuum through filter paper No. 390 (Filtrak, Niederschlag, Germany) on a Büchner funnel with 200 mg magnesium hydroxide carbonate.
This extraction was repeated until colourlessness
The combined extracts were rotary-evaporated under reduced pressure at 30 °C.
The dried residues were dissolved in 5 mL (volumetric flask) of ethanol using an ultrasonic bath.