Aquilinan,an acidic polysaccharide from Pteridium aquilinum

A water-soluble, acidic polysaccharide, aquilinan, was isolated from storage rhizomes and young fronds of bracken and shown to be homogeneous. The polysaccharide contained galactose, xylose, fucose and arabinose residues together with chains of repeating α(1-2′)glucuronosylmannose units. A method of correcting the mannose content for degradation during the hydrolysis of the aldobiuronic acid is described.     

Phloroglucinol derivatives in Dryopteris parallelogramma and D. patula

The phloroglucinol composition in two tropical American ferns, Dryoperis parallelogramma and D. patula has been investigated. Dryopteris parallelogramma, a member of the D. filix-mas complex, contains filixic acids, which are a characteristic of the group. Dryopteris patula contains aspidin, as do its relatives in the D. dilatata complex, and albaspidin-AA.     

Polypodoaurein,a new phytoecdysone from Polypodium aureum L.

A new phytoecdysone was isolated from Polypodium aureum L. and its structure determined as 25-O-methylecdysterone.