Flash chromatography was performed according to Still, Kahn,
and Mitra (1978). The column was packed with 40–63 lm silicagel
flash F60 (Silicycle, Quebec, Canada) suspended in hexane/ethyl
acetate (35:65, v/v). The oil was solubilised with methanol and
mixed with a small amount of silica. After solvent removal, the
resulting powder was put at the top of the silicagel column and
eluted with the same solvent mixture used to pack the column. A
pump was used for elution of the mobile phase about 5 cm/min.
The fractions collected (each vial with 100 mL) were grouped by
similarity according to their thin layer chromatography (TLC) profile
and the solvent removed by evaporation under reduced pressure.
Cafestol + kahweol were obtained together and referred
here as standard mixture.