The procedure followed was according to Mellidis,
Papageorgiou, and Kokkalou (1993). The cartridge
was put in a Soxhlet apparatus (1 l) and extracted successively with three solvents of increasing polarity ((a)
toluene, (b) dichloromethane, (c) methanol) until
decoloration ( 3 times). The three extracts obtained
were evaporated under vacuum to dryness. Their
weights were 2.82 g for toluene extract, 2.80 g for
dichloromethane extract and 136.41 g for methanol
extract