A new phytochemical survey of Malaysia V. Preliminary screening and plant chemical studies

Alkaloids and Anthraquinones from Malaysian Flora

“…Phytochemical survey of the flora of the Peninsula Malaysia and Sabah, with systematic screening for alkaloids resulted in reports on chemical constituents of several plants from Annonaceae illustrating great interest in this field (Teo, et al, 1990). Lavault et al, (1981) analysed the alkaloid content of three Annonaceae plants; Disepalum pulchrum, Polyalthia macropoda and Polyalthia stenopetala which led to the isolation of several isoquinoline compounds.…”

In vitrobiological evaluation of 100 selected methanol extracts from the traditional medicinal plants of Asia

“…The dried extracts used in the experiments were dissolved in 0.05% DMSO. α-glucosidase inhibitory activity (%) 3) α-tyrosinase inhibitory activity (%) 4) Anti-inflammatory activity Anticancer activity (%) 7) Cell viability (%) 5) NO inhibition (%) 6) 1 α-glucosidase inhibitory activity (%) 3) α-tyrosinase inhibitory activity (%) 4) Anti-inflammatory activity Anticancer activity (%) 7) Cell viability (%) 5) NO inhibition (%) 6) 55 One hundred methanol extracts were purchased from the Plant Extract Bank (Korea). All experiments were performed independently in triplicate (n = 3).…”

“…The percent α-glucosidase inhibitory activity was calculated as: (%) = [Acontrol -(Asample -Ablank)]/Acontrol × 100. 4) Tyrosinase inhibition activity was determined using L-DOPA as the substrate. Tyrosinase activation was tested by measuring the absorbance at 492 nm.…”

“…Unlike synthetic medicines, natural medicinal plants promote the natural functions of the body. In recent decades, study of natural medicines has been highly suggested by an increasing number of scientific observers in biological activity research [3][4][5][6][7][8][9].…”

5-Hydroxytryptamine1Areceptor binding activity of bisbenzyltetrahydroisoquinoline alkaloids fromPopowia odoardi

“…is indicated for the treatments of mental diseases and snake bites in East Africa (Hedberg et al, 1982), while P. herenthas is used in Madagascar as febrifuge (Rasoanaivo et al, 1992). A phytochemical screening survey reported that P. odoardi contain several alkaloids which have not been isolated and identified (Teo et al, 1990).…”