An improved micromethod for theophylline determination by reversed-phase liquid chromatography.

Care in use of phenazine methosulfate in the laboratory.

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...

Reversed-phase Salt Assisted Liquid-liquid Extraction: A New Technique for Preconcentration and Determination of Crocin in Herbal Medicines by HPLC

A reversed-phase salt assisted liquid-liquid extraction (RP-SALLE) method was developed for the preconcentration and determination of trace crocin in herbal medicines by high-performance liquid chromatography (HPLC). In developed method, the roles of the aqueous and organic phases are inverted so that the analyte is extracted from the organic into the aqueous phase after salt addition and phase...

Interferenceinthe Proposed Selected Methodfor Determination of Theophyllineby Liquid Chromatography

recovery, a 10.72 0.49 84.3 6.Orcutt, J.J.,Kozak,P.P.,Gillman, S.A., and Cummins, L. H., Microscale method for theophylline in body fluids by reversed-phase high pressure liquid chromatography. Clin. Chem. 23,559-601 (1977). 7. Van den Bemd, A. A., Van Gorp, M. J. L. M.,and Verhoff, M. C. C., Bepaling van theophylline inserum met behulp van HPLC. Pharm. Weekbl. 113, 424-428 (1978). 8. Tang, D. ...

A simple, sensitive and rapid isocratic reversed-phase high-performance liquid chromatography method for determination and stability study of curcumin in pharmaceutical samples

Objective: This study was designed to develop and validate a new reversed-phase high-performance liquid chromatography (RP-HPLC) method based on Q2 (R1) International Conference on Harmonization (ICH) guideline for determination of curcumin in pharmaceutical samples. Materials and Methods: The HPLC instrument method was optimized with isocratic elution with acetonitrile: ammonium acetate (45:55...

Separation and quantitation of theophylline and paraxanthine by reversed-phase liquid chromatography.