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chimaphilin/wintergroen
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6 resultaten
Negative pressure cavitation-microwave assisted preparation of extract of Pyrola incarnata Fisch. rich in hyperin, 2'-O-galloylhyperin and chimaphilin and evaluation of its antioxidant activity.
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A novel and effective extraction method, namely negative pressure cavitation-microwave assisted extraction technique (NMAE), was developed for the preparation of extracts of Pyrola incarnata Fisch., which are rich in the main constituents hyperin, 2'-O-galloylhyperin and chimaphilin. Single factor
Phenolic glycosides from Pyrola japonica.
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Five new phenolic glycosides, 2-beta-D-glucopyranosyloxy-5-hydroxyphenylacetic acid methyl ester (4), 4-hydroxy-2-[3-hydroxy-3-methylbutyl]-5-methylphenyl beta-D-glucopyranoside (5), 4-hydroxy-2-[(E)-4-hydroxy-3-methyl-2-butenyl]-5-methylphenyl beta-D-glucopyranoside (7),
A new naphthoquinone from Pyrola japonica.
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A new naphthoquinone, 5,8-dihydro-2,7-dimethyl-[1,4]naphthoquinone (1), which was named 5,8-dihydrochimaphilin, isolated from an ethyl acetate soluble fraction from the root of Pyrola japonica, together with chimaphilin (2). Compound 1 was transformed rapidly to 2 upon exposure to air by HPLC
The 1,4-naphthoquinone derivative from Pyrola rotundifolia activates AMPK phosphorylation in C2C12 myotubes.
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An aqueous ethanol extract of Pyrola rotundifolia L. induced AMP-activated protein kinase (AMPK) phosphorylation in C2C12 myotubes. The bioassay-guided fractionation of the extract led to the isolation a 2-methyl-7-hydroxymethyl-1,4-naphthoquinone, or a 7'-hydroxy-chimaphilin, which showed
[Studies on chemical constituents of in herb Pyrola calliatha].
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OBJECTIVE
To investigate the chemical constituents of Pyrola calliatha.
METHODS
The chemical constituents were isolated by various column chromatographic methods. The structures were identified by spectral data.
RESULTS
Ten compounds were isolated and identified as chimaphilin (1), uvaol(2), ursolic
An effective homogenate-assisted negative pressure cavitation extraction for the determination of phenolic compounds in pyrola by LC-MS/MS and the evaluation of its antioxidant activity.
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A novel extraction method, homogenate-assisted negative pressure cavitation extraction (HNPCE), was designed for the extraction and determination of the main phenolic compounds of Pyrola incarnata Fisch. by LC-MS/MS. The particle sizes and extraction yields in the process of homogenization were
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