Denfigenin, a diosgenin derivative from Dendrobium fimbriatum

In Vitro Propagation by Asymbiotic Seed Germination and 1,1-Diphenyl-2-picrylhydrazyl (DPPH) Radical Scavenging Activity Studies of Tissue Culture Raised Plants of Three Medicinally Important Species of Dendrobium

“…45) Based on this principle, the antioxidant activity of a substance can be expressed as its ability to scavenge the DPPH free radical. The methanolic extracts of Dendrobium species are known to contain a wide variety of potentially useful chemical compounds that include alkaloids, 46) fluorenones and sesquiterpenoids, 47) stilbenoids, 15) alkyl ferulates. 48) Some of these chemical constituents, like stilbenoids, 49) alkyl ferulates, 48) aromatic phenolic compounds 50) are known to possess antioxidant activity.…”

Constituintes químicos de Bombacopsis glabra (bombacaceae)

“…Esta análise possibilitou a identificação do composto 4 como o p-cumarato de triacontila (defuscina). Este composto foi isolado pela primeira vez da espécie Dendrobium fuscescens 21 , sendo posteriormente também isolado da espécie D. fimbriatum 19 . Compostos deste tipo também foram isolados de Tapirira guianensis (Anacardiaceae) 22 , no entanto, na família Bombacaceae, este é o primeiro relato da ocorrência de um cumarato.…”

Cytotoxic bibenzyl dimers from the stems of Dendrobium fimbriatum Hook

“…1,2 It is distributed mainly in the southwest of China and some others Asian countries, such as Myanmar, Vietnam, Thailand, Nepal, and India. 3,4 Previous chemical investigations of its stems led to the isolation of phenanthrenes, 5,6 bibenzyls, 7,8 diosgenin derivatives, 9 anthraquinones, 5,6 coumarins 6 and so on. In addition, bioactivity studies on pure components have been reported to possess multiple positive effects in vitro experiments, including anti-tumor, anti-mutagenic, antiinflammatory and antioxidant effects.…”

“…The bioassay-guided chemical investigation of the stems of Dendrobium fimbriatum Hook led to the isolation of seven first reported bibenzyl dimers with a linkage of a methylene moiety, fimbriadimerbibenzyls A-G (1-7), together with a new dihydrophenanthrene derivative (S)-2,4,5,9-tetrahydroxy-9, 10-dihydrophenanthrene (8) and thirteen known compounds (9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21). The structure of the new compound was established by spectroscopic analysis.…”