ayapin/dendrobium

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[Study on distributed patterns of scoparone and ayapin in Dendrobium species from Yunnan].

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An HPLC method for determination of scoparone and ayapin was established for investigating the distributed patterns of scoparone and ayapin in 37 species of Dendrobium. The contents of scoparone and ayapin in varied collected samples were determined by the established HPLC method. The pseudo-bulbs

Ayapin, scopoletin and 6,7-dimethoxycoumarin from Dendrobium thyrsiflorum (Reichb. f.).

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[Studies on the chemical constituents of Dendrobium fimbriatum].

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OBJECTIVE To investigate the chemical constituents of Dendrobium fimbriatum Hook. METHODS Various chromatographic techniques were employed for isolation and purification of the constituents. The structures were elucidated by IR, MS, 1HNMR, 13CNMR and 2D-NMR. RESULTS Eight compounds were obtained and

Simultaneous analysis of trans- and cis-isomers of 2-glucosyloxycinnamic acids and coumarin derivatives in Dendrobium thyrsiflorum by high-performance liquid chromatography (HPLC)-photodiode array detection (DAD)-electrospray ionization (ESI)-tandem mass spectrometry (MS).

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A novel method has been developed for simultaneous analysis for three pairs of trans- and cis-isomers of 2-glucosyloxycinnamic acids, along with their biogenic metabolites (three coumarin derivatives including scopoletin, scoparone and ayapin) in a Chinese medicinal herb Dendrobium thyrsiflorum by

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