Abstract
Five flavonoid compounds were isolated from two Polypodium species (P. decumanum and P. triseriale) with the common name Calaguala. Structure elucidation was carried out using different
NMR techniques and revealed the presence of one new glycoside (kaempferol 3-O-β-D-xylopyranosyl-(1-2)-β-D-arabinopyranoside) (1), two known flavonoid glycosides, rutin and kaempferol 3-O-α-D-arabinopyranoside (2, 3), the trimeric proanthocyanidin, selligueain (4), and the coumarinic acid derivative, melilotoside (5). The compounds were tested for their activity in PAF induced exocytosis in human
neutrophils but none of the compounds showed PAF specific activity. Instead, they
showed more general effects on the neutrophil including inhibition of the spontaneous
elastase release (5) and potentiation of the release induced by PAF (1). Selligueain was found to inhibit the proteolytic enzyme, elastase in vitro.
Key words
Calaguala -
Polypodium decumanum
-
Polypodium triseriale
- Polypodiaceae - platelet activating factor - flavonoids - human neutrophil - elastase
release
