Determination of Oxaliplatin and Curcumin in Combination via Micellar HPLC and Its Method Validation

BACKGROUND

A micellar-HPLC method was developed for the determination of oxaliplatin (OHP) and curcumin (CUR) employing a C18 column [4.6 × 250 mm, particle size (dp)  = 5 µm] and diode array detector.

OBJECTIVE

A rapid, cost-effective, environmentally friendly, time-efficient, easy-to-handle, and safe method was developed.

METHODS

The conditions were optimized for the estimation of OHP and CUR: 0.15 M sodium dodecyl sulfate (SDS) in 6% (v/v) pentanol buffered to pH 5.0 with a flow rate of 1.0 mL/min, injection volume of 20 µL, and detection at 325 nm. Different analytical parameters, including linearity, accuracy, precision, robustness, specificity, LOD, and LOQ, were determined in compliance with the International Council on Harmonisation (ICH) guidelines.

RESULTS

The LOD (S/N = 3) of OHP was 0.004 µg/mL and for CUR it was 0.005 µg/mL. The calibration curves for OHP and CUR were linear over the range 0.015-10 µg/mL (determination coefficient r2 = 0.9999) and 0.015-10 µg/mL (r2 = 0.9994), respectively.

CONCLUSION

The drugs were eluted in <12 min and the developed method was applicable for analyzing multiple samples per day. Moreover, it was determined to be robust and was used to quantify OHP and CUR in mice serum/blood. The method could pave the way for quantitative analysis of these drugs during the development of a pharmaceutical preparation for the treatment of colorectal cancer.

HIGHLIGHTS

A simple, cost-effective, eco-friendly HPLC method was developed to simultaneously estimate oxaliplatin and curcumin. The developed method was validated as per the ICH guidelines.

Stability studies of rifampicin in plasma and urine of tuberculosis patients according to the European Medicines Agency Guidelines

Aim: The macrolide antibiotic rifampicin is prescribed against several infections, like tuberculosis disease. This drug decays to rifampicin quinone. Results/methodology: The biological fluids were diluted in a micellar solution and directly injected. Using a C18 column and a mobile phase of 0.15 M SDS-6% 1-pentanol phosphate-buffered at pH 7, running at 1 ml/min, the analytes were resolved in less than 15 min. The detection was by absorbance at 337 nm. Method was validated by the guidelines of the European Medicines Agency. Decomposition of rifampicin to rifampicin quinone was also studied. Discussion/conclusion: Procedure is rapid, easy-to-handle, economic, eco-friendly and with a high sample throughput. It was successfully used to monitor rifampicin in the plasma and urine of tubercular patients.

Development of a method to determine axitinib, lapatinib and afatinib in plasma by micellar liquid chromatography and validation by the European Medicines Agency guidelines

A method based on micellar liquid chromatography to quantify the tyrosine kinase inhibitors axitinib, lapatinib and afatinib in plasma is reported. The sample pretreatment was a simple 1/5-dilution in a pure micellar solution, filtration and direct injection, without requiring extraction or purification steps. The three drugs were resolved from the matrix in 17min, using an aqueous solution of 0.07M sodium dodecyl sulfate - 6.0% 1-pentanol, buffered at pH7 with 0.01M phosphate salt as mobile phase, running under isocratic mode at 1mL/min through a C18 column. The detection was performed by absorbance at 260nm. An accurate mathematical relationship was established between the retention factor of each drug and the surfactant/organic solvent concentration in the mobile phase, achieved with a limited number of experiments, in order to optimize these factors. A binding behavior of the analytes face to the micelles was found out. The method was successfully validated by the guidelines of the European Medicines Agency in terms of: selectivity, linearity (r²>0.9995), calibration range (0.5 to 10mg/L), limit of detection (0.2mg/L), carry-over effect, accuracy (-8.1 to +6.9%), precision (<13.8%), dilution integrity, matrix effect, stability and robustness. The procedure was found reliable, practical, economic, accessible, short-time, easy-to-handle, inexpensive, environmental-friendly, safe, useful for the analysis of many samples per day. Finally, the method was applied to the analysis of incurred, using quality control samples in the same analytical run, with adequate results. Therefore, it can be implementable for routine analysis in clinical laboratories.

Use of micellar liquid chromatography for rapid monitoring of fungicides post harvest applied to citrus wastewater

A method based on micellar liquid chromatography has been developed to simultaneously monitor four pesticides largely post-harvest applied to citrus: thiabendazole, pyrimethanil, o-phenylphenol and imazalil. Water samples were filtered and directly injected without other treatment, thus avoiding extraction steps. The composition of the mobile phase was optimized using a chemometrical approach to achieve and excellent resolution to 0.07 mol/L SDS/5%, V/V 1-pentanol buffered at pH3. Mobile phase run through a C18 column at 1 mL/min at room temperature. The detection was performing by UV-Visible absorbance using a wavelength program: 0-10 min, 305 nm (for thiabendazole); 10-12; 265 nm (for pyrimethanil) and 12-18, 220 nm (o-phenylphenol and imazalil). The developed method was validated following the guidelines of the US Environmental Protection Agency in terms of: quantitation range, (0.5-4 to 15 μg/mL), linearity (r(2)>0.9995), sensitivity (LOD, 0.18-1.4 μg/mL), precision (<9.2%), trueness (93.9%-103.7%), and ruggedness (<9.9%). It was found that the fungicides remain up to eight days in surface water at outdoor conditions. The method was used to screen the presence of the analytes in several waste water samples, and was proved to be useful in routine analysis.

Micellar Liquid Chromatography from Green Analysis Perspective

Micellar liquid chromatography (MLC) is a simple well-established branch of high-performance liquid chromatography. The applications of MLC for the determination of numerous compounds in pharmaceutical formulations, biological samples, food, and environmental samples have been growing very rapidly. MLC technique has several advantages over other techniques, such as simultaneous separation of charged and uncharged solutes, rapid gradient capability, direct on-column injection of physiological fluids, unique separation selectivity, high reproducibility, robustness, enhanced luminescence detection, low cost, and safety. This review is devoted to the evaluation of the agreement of MLC with the principles of green chemistry which recently represents a universal trend. Also, it provides an overview on the basics of MLC, in addition to a survey of MLC methods published in the past five years for the assay of various compounds in different matrices.