In the present work, leaves of mangrove plant, Derris trifoliata was successively extracted with methanol and for characterization, the leaf extract was subjected to thin layer chromatography and high performance thin layer chromatography. Different compounds were isolated and the structure of one particular compound was elucidated by NMR, IR, UV and GC-MS spectra.

antibacterial activity of the aerial extracts from xanthium brasilicum prepared in methanol, diethyl ether, petroleum benzene and an equal mixture of the three solvents were studied against bacterial laboratory standards and clinical isolates using the disk diffusion method. the best antibacterial results were obtained when methanol or the solvent mixture was used. the crude extract with the hi...

The 2-hydroxy fatty acids tend to yield streaks in thin-layer chromatography on silica gel plates. If potassium oxalate is included with binder-free silica gel, good spots are obtained. Similar difficulties are found in paper chromatography of the fatty acid derivatives of coenzyme A, especially with long-chain acids. The same thin-layer system gives good spots with these compounds.