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Structural characterization of flavonol 3,7-di-O-glycosides and determination of the glycosylation position by using negative ion electrospray ionization tandem mass spectrometry.
TLDR
Investigation of negative ion ESI-MS(2) and MS(3) spectra of Flavonol O-glycosides allows their rapid characterization as flavonol 3,7-di-O-gly coside and their differentiation from isomeric mono-O -diglycosides, and also enables their direct analysis in crude plant extracts.
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Lignans and neolignans from Sinocalamus affinis and their absolute configurations.
TLDR
Twenty-two new lignans and neolignans (1-22), together with 14 known analogues, have been isolated from an ethanolic extract of the stem (with skin removed) of Sinocalamus affinis by spectroscopic and chemical methods.
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Structures, biogenesis, and biological activities of pyrano[4,3-c]isochromen-4-one derivatives from the Fungus Phellinus igniarius.
Further chemical investigation of the Chinese medicinal fungus Phellinus igniarius has resulted in the isolation and structural elucidation of three pyrano[4,3-c]isochromen-4-one derivatives,…
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Indole alkaloid sulfonic acids from an aqueous extract of Isatis indigotica roots and their antiviral activity
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Sesquiterpenes from the red alga Laurencia tristicha.
TLDR
Seven new sesquiterpenes (1-7), together with seven known sesQuiterpeners, together with laurebiphenyl (14) have been isolated from the red alga Laurencia tristicha and showed moderate cytotoxicity against all tested cell lines.
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Bioactive neolignans and lignans from the bark of Machilus robusta.
TLDR
Sixteen new neolignans and lignans (1-16), together with 12 known analogues, have been isolated from an ethanol extract of the bark of Machilus robusta, and the known compounds (-)-pinoresinol and (+)-lyoniresinol were active against serum deprivation induced PC12 cell damage.
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Glycosides from the root of Iodes cirrhosa.
TLDR
In the in vitro assays, compound 4 and liriodendrin both showed activity against glutamate-induced PC12 cell damage at 10 (-5) M M, and the validity of J 7,8 and Deltadelta C8-C7 values to distinguish threo and erythro derivatives was discussed.
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Phelligridins C-F: cytotoxic pyrano[4,3-c][2]benzopyran-1,6-dione and furo[3,2-c]pyran-4-one derivatives from the fungus Phellinus igniarius.
Three unique pyrano[4,3-c][2]benzopyran-1,6-dione derivatives and a new furo[3,2-c]pyran-4-one, named phelligridins C-F (2-5), together with hispolon (8), (E)-4-(3,4-dihydroxyphenyl)but-3-en-2-one…
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Mono-, Bi-, and triphenanthrenes from the tubers of Cremastra appendiculata.
Six newphenanthrene derivatives, including three monophenanthrenes (1-3), two biphenanthrenes (4 and 5), and a triphenanthrene (6), have been isolated from an ethanolic extract of the tubers of…
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Chemical constituents of Pyrrosia petiolosa
TLDR
The new flavone diglycoside 7-O-[6-O-(α-L-arabifuranosyl)-β-D-glucopyranosyl]-gossypetin, named as pyrropetioside, along with 13 known compounds have been isolated from Pyrrosia petiolosa.
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