Chromatography Techniques

Hyphenated Chromatography-HPLC Methods

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The hyphenated technique is developed from the coupling of a separation technique and an on-line spectroscopic detection technology. Several remarkable improvements in hyphenated analytical methods over the last two decades have significantly broadened their applications in the analysis of biomaterials, especially natural products, pre-isolation analyses of crude extracts or fraction from various natural sources, isolation and detection of natural products, chemical fingerprinting, testing of herbal products, de-replication of natural products, and metabolomics. Rapid identification and characterization of known and new natural products directly from plant and marine sources without the necessity of isolation and purification can be achieved by various modern hyphenated techniques. Techniques like HPLC coupled to NMR (Nuclear Magnetic Resonance) or electrospray ionization tandem mass spectrometry (ESI-MS-MS) have been proven to be extremely powerful tools in natural product analysis, as they aid in the fast screening of crude natural product extracts or fractions for detailed information about metabolic profiles, with minimum quantity of material. Hyphenated HPLC techniques include HPLC-MS, HPLC-ESI-MS, HPLC-IC-MS, HPLC-NMR-MS, HPLC-DAD, HPLC-CE-MS, HPLC-UV, Coupling LC and MALDI-TOF.