The Importance Of LC-MS And LC-NMR In The Discovery Of New Lead Compounds From Plants

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Analytical Chemistry

Background:

• Phytochemical investigations require rapid detection of biologically active natural products from crude plant extracts.
• High-Performance Liquid Chromatography (HPLC) with various detection methods is crucial for efficient screening.

Purpose of the Study:

• To evaluate hyphenated techniques for rapid structural determination and identification of bioactive natural products.
• To demonstrate the utility of LC/NMR as a complement to LC/UV/MS screening.

Main Methods:

• HPLC coupled to UV photodiode array detection (LC/DAD-UV).
• HPLC coupled to mass spectrometry (LC/MS and LC/MS/MS).
• HPLC coupled to Nuclear Magnetic Resonance (LC/NMR).
• On-line bioautographic assays for antifungal constituents.

Main Results:

• Hyphenated techniques (LC/UV, LC/MS, LC/MS/MS, LC/NMR) enabled rapid structural determination of known plant constituents using minimal plant material.
• On-line bioassays facilitated quick localization of bioactive antifungal compounds.
• Combined approaches avoided time-consuming isolation of common natural products.

Conclusions:

• Hyphenated LC techniques, particularly LC/NMR, are powerful tools for efficient phytochemical screening and dereplication.
• These methods allow targeted isolation of compounds with significant spectroscopic or biological activity.
• The study showcases applications for identifying antifungal constituents in Gentianaceae and Leguminosae species.