Flavonoid Glycosides As Taxonomic Markers In The Ferns Sphaerostephanos


Umi Kalsom Yusuf, Jabatan Biologi, Fakulti Sains dan Pengajian Alam Sekitar, Universiti Pertanian Malaysia, 43400, Serdang, Selangor.


Trends in Traditional Medicine Research, Proceedings of the International Conference on the Use of Traditional Medicine & Other Natural Products in Health Care




Sphaerostephanos unitus, S. polycarpus, S. penniger, S. larutensis, S.heterocarpus, S. peltochlamys, S. hendersonii, S. norisii, S. pterosporus; Thelypteridaceae: flavonoid glycosides.


Flavonoid surveys of hydrolysed and direct leaf extracts from nine Sphaerostephanos species revealed 12 compounds. For the first time in the Thelypteridaceae, isorhamnetin 3-0-glucoside and apigenin 1-0-glucoside were isolated from the leaves of 5. heterocarpus. The leaf flavonoids divides Sphaerostephanos into two groups viz; those with tlavonoid glycosides and aglycones (five species) and those that lack (four species). The five species within the former group can be distinguished from one another by certain variations in their flavonoid patterns. Thus, S. heterocarpus differs markedly from S. polycarpus and S. unitus by the presence of apigenin 7-0-glucoside and isorhamnetin 3-O-glucoside. S. polycarpus is distinguished from S.unitus and S.penniger since it contains kaempferol 3-0-rhamnoside, in contrast to S. unitus and S. penniger that have 5-deoxy-quercetin and S. larutensis with only kaempferol 3-0-galactoside.