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2D-HPLC-MS Technology Combined with Molecular Network for the Identification of Components in Tibetan Medicine Aconitum pendulum

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New labdane diterpenes from Leonurus cardiaca.

Vijai K Agnihotri¹, Hala N Elsohly, Troy J Smillie

¹National Center for Natural Products Research, School of Pharmacy, University of Mississippi, University, Mississippi, USA.

|July 31, 2008

Summary

Researchers isolated three new labdane diterpenes from Leonurus cardiaca L. leaves. These compounds showed antiplasmodial activity against malaria parasites and were tested for cytotoxicity.

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A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

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Published on: October 4, 2019

Area of Science:

Natural Product Chemistry
Medicinal Chemistry
Pharmacology

Background:

Leonurus cardiaca L. (motherwort) possesses a history of traditional use in oriental medicine for various ailments.
Phytochemical investigations of Leonurus cardiaca are crucial for identifying bioactive compounds with therapeutic potential.

Purpose of the Study:

To isolate and characterize novel labdane-type diterpenes from the ethanolic leaf extract of Leonurus cardiaca L.
To evaluate the in vitro antiplasmodial activity and cytotoxicity of the isolated compounds.

Main Methods:

Extraction of Leonurus cardiaca L. leaves using ethanol.
Structure elucidation of isolated compounds using comprehensive 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopic techniques (1H-1H COSY, HMQC, HMBC, ROESY).
In vitro assessment of antiplasmodial activity against Plasmodium falciparum (D6 and W2 clones) and cytotoxicity against Vero cells.

Main Results:

Three new labdane-type diterpenes, designated 15-O-ethylleopersin C (1), 15-O-methylleopersin C (2), and 15-EPI-O-methylleopersin C (3), were successfully isolated and characterized.
The structures of compounds 1-3 were definitively determined through advanced NMR spectroscopic analysis.
Preliminary evaluation indicated antiplasmodial activity for compounds 1-3, with varying degrees of efficacy against the tested Plasmodium falciparum clones.

Conclusions:

The ethanolic leaf extract of Leonurus cardiaca L. is a source of novel labdane diterpenes.
Compounds 1-3 warrant further investigation for their potential as antimalarial agents.
Further studies are needed to determine the safety profile and mechanism of action of these compounds.