Phytochemical Analysis
Superheated water chromatography-nuclear magnetic resonance spectroscopy of kava lactones.
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Three kava lactone constituents of Piper methysticum, namely, kawain, methysticin and desmethoxyyangonin, have been separated and identified by reversed-phase HPLC using superheated deuterium oxide as the mobile phase and on-line 1H-NMR detection. The method avoids the use of organic solvents in the mobile phase and hence interferences in the NMR analysis are minimised.