Polypodoside from Polypodium glycyrrhiza

Another sweet-tasting saponin, osladin (17), occurs at rather low concentrations (about 0.03%) in the roots of the fern Polypodium vulgare (Hodge and Inglett, 1974). Similar steroidal glycosides have been isolated from the rhizomes of Polypodium glycyrrhiza (Kim et al., 1988 Kim and Kinghom, 1989). The major intensely sweet compound of that plant is polypodoside A, a 26-0-a-L-rhamnopyranosyl-pol-... 

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