leonurus japonicus/silica

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[Coumarins from Leonurus japonicus and their anti-platelet aggregative activity].

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Chemical constituents of Leonurus japonicus were isolated and purified by a combination of various chromatographic techniques including column chromatography over silica gel, Sephadex LH-20, MCI, and Rp C18. Structures of the isolates were determined by spectroscopic analysis as 10 coumarins:

[A new C-28 nortriterpenoid from fruits of Leonurus japonicus].

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OBJECTIVE To study the chemical constituents from the fruits of Leonurus japonicus. METHODS The compounds were extracted by 70% methanol, then isolated and purified by column chromatography on silica gel, RP-18, Sephedax LH-20 and HPLC. Their structures were determined on the basis of spectroscopic

Soluble epoxide hydrolase inhibitory activity of components from Leonurus japonicus.

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One new compound, 10-methoxy-leonurine (1), and four known compounds (2-5) were purified by silica gel, C-18, and Sephadex LH-20 column chromatography from Leonurus japonicus. Their structures were elucidated using one-dimensional (1D)/two-dimensional (2D)-nuclear magnetic resonance (NMR),

[Chemical constituents and antitumor activity on leukemia K562 cell of Leonurus heterophyllus].

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The chemical constituents of Leonurus heterophyllus were separated and purified by repeated column chromatography on silica gel, HPD 100, Sephadex LH-20, and PHPLC. Each compound was characterized by spectroscopic and physical data. Eight compounds have been purified and identified to be quercetin

Leojaponic acids A and B, two new homologous terpenoids, isolated from Leonurus japonicus.

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The present study aimed at isolation and purification of the bioactive terpenoids from the herb of Leonurus japonicus by chromatographic separations such as silica gel, sephadex LH-20 and C18 reversed phase silica gel, as well as preparative HPLC. As a result, leojaponic acids A (1, C17H24O4) and B

Multi-residue analysis of pesticides in traditional Chinese medicines using gas chromatography-negative chemical ionisation tandem mass spectrometry.

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In this study, a residue analysis method for the simultaneous determination of 107 pesticides in traditional Chinese medicines (TCMs), Angelica sinensis, A. dahurica, Leonurus heterophyllus Sweet, Pogostemon cablin and Lonicera japonica Thunb., was developed using gas chromatography coupled with

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