A weighed amount (14 mg) of dried ethanol extract of the aerial
parts of P. argentea was dissolved in 1 mL of DMSO. In the same way,
15 mg of the lyophilized decoction and infusion were dissolved in
1 mL of a hot mixture of H2O–DMSO 1:1 (v/v). One aliquot of each
sample was then filtered through a 0.45 m cellulose acetate filter
and injected into the HPLC system.