Prior to the identification of individual compounds using LC–
MS, the crude extracts were purified by solid-phase extraction.
For this purpose, the extracts were evaporated under a stream of
nitrogen and filled up to 50 mL (arils) and 100 mL (pericarp) with
methylene chloride. Single-use cartridges were filled with 2 g of
polyamide and activated with 25 mL methanol and 50 mL methylene
chloride. Aliquots of 5 mL (pericarp) and 10 mL (arils) were
applied to the sorbent and after washing with 50 mL of methylene
chloride, xanthones were eluted with 100 mL of methanol. After
evaporation to dryness in vacuo at 30 C, the eluates were dissolved
in 3 mL of methanol, membrane-filtered (0.45 lm) and used for
LC–MS analysis.