background and purpose: gastric cancer (gc) is one of the most common cancers worldwide and in iran. as conventional therapies such as surgery and chemotherapy are invasive with adverse effects, current studies are important as they are conducted to find natural compounds with few adverse effects. in this study, melittin with 26 amino acids was isolated and purified from bee venom and its effec...

Bennett RD and Heftmann E (1962) Thin-layer chromatography of sterols. Journal of Chromatography 9: 359. Copius-Peereboom JW and Beekes HW (1965) The analysis of mixtures of animal and vegetable fats. V. Separation of sterol acetates by thin-layer chromatography in reversed-phase systems and on silica gel G} silver nitrate layers. Journal of Chromatography 17: 99. Hung GWC and Harris AZ (1989) ...

A rapid method for the separation and quantitation of unesterified cholesterol and cholesteryl esters by high-performance liquid chromatography is described. All of the cholesteryl esters typically present in plasma were resolved on Zorbax ODS reversed-phase columns using a linear gradient of water (3%-0%) in acetonitrile-tetrahydrofuran 65:35 (v/v) as eluting solvent. Results obtained by this ...

The possibility of carbohydrate separation in BEH HILIC (Ethylene Bridged Hybride, Hydrophilic Interaction Liquid Chromatography) column was studied by ultra-performance liquid chromatography (UPLC) with evaporative light scattering detector (ELSD) and mobile phase containing amine compounds as modifiers. The chromatography conditions and ELSD parameters were optimized to separate five typical ...

We report a new and simple design of a fully automated dual-online ultra-high pressure liquid chromatography system. The system employs only two nano-volume switching valves (a two-position four port valve and a two-position ten port valve) that direct solvent flows from two binary nano-pumps for parallel operation of two analytical columns and two solid phase extraction (SPE) columns. Despite ...

3. Soldin, S. J., and Hill, ,J. R., A rapid micromethod for measuring theophylline in serum by reversed-phase high-performance liquid chromatography. Clin. Biochem. 10, 74-77(1977). 4. Nelson, J. W., Cordry, A. L., Aron, C. C., and Baitell, R. A., Simplified micro-scale procedure for preparing samples for theophylline determination by liquid chromatography. Clin. Chem. 23, 124-126 (1977). 5. Pe...

A high-performance liquid chromatographic technique for the simultaneous determination of prednisolone and prednisone in human plasma, whole blood, urine, and bound-to-plasma proteins, using betamethasone as internal standard, is presented. Liquid-liquid extraction is used for whole blood samples, and solid phase extraction is used for plasma, urine, and proteins bound to plasma. The accuracy, ...

After a brief recall of the chromatographic principles, t h e different applications of gas chromatographic measurements of thermodynamic equilibria were reviewed. Gas and liquid chromatographies are now well known and elegant methods for measuring the physicochemical properties and phase equil ibrium thermodynamic constants. Although fundamentally a dynamical method and mostly known as a power...