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Phytochemistry in the microgram domain - a LC-NMR perspective
Jean-Luc Wolfender1, Emerson F Queiroz, Kurt Hostettmann
1Laboratoire de Pharmacognosie et Phytochimie, Ecole de Pharmacie Genève-Lausanne, Section des Sciences Pharmaceutiques, Université de Genève, Switzerland. Jean-Luc.Wolfender@pharm.unige.ch
Magnetic Resonance in Chemistry : MRC
|July 29, 2005
Summary
Discovering new plant-derived medicines requires effective dereplication. Advanced hyphenated techniques like LC-NMR are crucial for identifying novel compounds in complex plant extracts, aiding therapeutic screening.
Area of Science:
- Natural Product Chemistry
- Phytochemistry
- Drug Discovery
Background:
- Plants are a rich source of novel molecules with therapeutic potential.
- Dereplication of crude plant extracts is vital to avoid isolating known compounds.
- Hyphenated techniques are increasingly used for chemical screening of plant-derived compounds.
Purpose of the Study:
- To explore the utility of hyphenated techniques for dereplication and identification of natural products in crude plant extracts.
- To integrate advanced analytical methods into the natural product isolation workflow.
- To enable on-line structure determination of bioactive compounds from complex matrices.
Main Methods:
- Liquid chromatography coupled with UV-Diode Array Detection (LC/UV-DAD), Mass Spectrometry (LC-MS), and Nuclear Magnetic Resonance (LC-NMR) were employed.
- LC-UV-MS was used as a primary dereplication step against UV and MS databases.
- LC-NMR was utilized for on-line structure elucidation, especially for unstable or inseparable compounds.
Main Results:
- The integrated hyphenated approach allowed for partial or complete on-line identification of natural products in crude plant extracts.
- This strategy facilitated the study of unstable compounds that degrade rapidly or are difficult to isolate preparatively.
- LC-NMR proved essential for detailed structural information within the multi-hyphenated (hypernation) workflow.
Conclusions:
- Hyphenated techniques, particularly LC-NMR, are powerful tools for dereplicating and identifying novel natural products from plants.
- The described approach enhances efficiency in drug discovery by streamlining the screening of plant extracts.
- At-line strategies using microfractionation and microflow probes offer solutions for low-sensitivity experiments in natural product analysis.