The genus Phlogacanthus belongs to the family Acanthaceae and consists of more than 49 species, These species are widespread in tropical and subtropical zones such as Bangladesh, Bhutan, China, Indonesia, India, Myanmar and Vietnam. In Vietnam, the genus contains about 06 species. The extracts from some species in this genus have been evaluated for biological activities as analgesic, antiinflammatory, antimicrobial, antioxidant, antihyperglycemic and cytotoxic activities. In this study, the whole plant of Phlogacanthus turgidus was collected, dried, cut into small species, and extracted with ethanol to yield the ethanolic extract. Isolation of chemical constituents was performed using column chromatography on silica gel; their structures were elucidated by HRESI-MS, 1D & 2D-NMR and compared with published data. Six compounds, including two nor-isoprenoids: (+)-dehydrovomifoliol (1), (3S,5R,6R,7E,9S)-megastiman-7-ene-3,5,6,9-tetrol (2), two steroids b - sitosterol (3), daucosterol (4), one lignan (+)-syringaresinol (5), a derivative of phenylethanoid glycosides: martynoside (6) were isolated from the ethyl acetate extract of the whole plant of P. turgidus. Among them, 1, 2 were reported for the first time from the genus Phlogacanthus, while 3, 4, 5, 6, were found for the first time from this species.

In Vietnam, the medicinal plant Drynaria bonii H. Christ is used for the treatment of osteoporosis, bone fractures, and stimulate the growth of hair, treat tinnitus (Ho 2002; Loi 2004). In this article, experiments were designed to investigate the proliferation activity of ethanol, n-hexane, chloroform, ethyl acetate and methanol extracts from D. bonii rhizomes on MG-63 human osteoblast-like cells. The results showed that methanol and hexane extracts had the ability to proliferate MG-63 cells at the concentration varying from 0.1 to 0.01 μg/mL. In particular, at the concentration of 0.01 μg/mL, hexane and methanol extracts illustrated the highest proliferation ratio with 9.31% and 6.16%, respectively. By column chromatography, a new compound named drynaether A (1) and five known compounds uracil (2), 4'-hydroxy-7-methoxyflavan (3), kaempferol (4), indole-3-carboxylic acid (5) and protocatechuic acid (6) were isolated and identified from the methanol extract.