The simultaneous determination of naringenin and its valine carbamate prodrug in rat plasma using supercritical fluid chromatography -tandem mass spectrometric method

Establishment and optimization of a high-throughput UPLC-MS/MS method for the simultaneous quantitation of cycloicaritin and its valine carbamate prodrug in rat plasma

An ultra-performance liquid chromatography-tandem mass spectrometry was developed to assay the concentration for the quantification of cycloicaritin and its carbamate prodrug (3-O-L-valyl carbamate prodrug of cycloicaritin) in the plasma of Sprague-Dawley rats. Analytes were separated on an Acquity UPLC BEH C18 (2.1 × 50 mm, 1.7 μm) after liquid-liquid extraction with methyl tert-butyl ether. Acetonitrile and water containing 0.1 % formic acid were the mobile phases of the method. Using electrospray ionization in the positive ion mode, the method was performed with a total run time of 2.60 min. The response of the experiments was linear over the concentration ranges from 1 to 250 ng/mL for cycloicaritin and 1-250 ng/mL for prodrug. The intra- and inter-day precision and accuracy were within the recommended limits of the FDA. The matrix effect that we observed met the criteria. The method was successfully applied to the pharmacokinetics of cycloicaritin and its carbamate prodrug in Sprague-Dawley rats.

Development and validation of UV spectrophotometric method for estimation of naringenin in phytosomal formulation: interlaboratory comparison, capability, and statistical analysis

The goal of the current work was to establish a simple, reproducible, and reliable UV spectrophotometric method for determining naringenin in phytosomal formulations. The solvent methanol was optimized and spectrophotometric analysis was carried out at 289 nm. The proposed method was also validated for linearity, specificity, accuracy, precision, ruggedness, and robustness in accordance with the International Council for Harmonisation (ICH). With a correlation coefficient of 0.9982, the concentration of naringenin in the range of 2-14 μg/ml follows Lambert-Beer rule. The accuracy ranged between 99.33 and 99.75%. The predicted percent recovery was found to be 99.48 ± 0.41. It was found that the limits of detection (LOD) and quantification were 0.54 μg/ml and 1.66 μg/ml, respectively. The normality of the data is accepted by the Shapiro-Wilk test (P = 0.9065) and Shapiro-Francia test (W = 0.9866). On the Bland-Altman plot, an acceptable repeatability coefficient was found. The remarkable inter-laboratory repeatability was proved by the Youden plot, which was also utilized to spot random and total errors. Levey-Jennings charts and other control diagrams have demonstrated that the method is statistically controlled. Greater values of Cp (1.03) and Cpk (0.83) were seen in the capability analysis, indicating that the method could analyze the samples reliably and consistently with minimum variation. The validation report demonstrated that the proposed method was appropriate for naringenin detection and analysis in phytosomal formulations, indicating that it can be employed for routine laboratory analysis as well.

Development of a UPLC-MS/MS method for the simultaneous determination of atorvastatin, 2-hydroxy atorvastatin, and naringenin in rat plasma and its application to pharmacokinetic interaction studies

Recent studies have revealed that the combination therapy of atorvastatin (ATV) with naringenin (NG) can offer meaningful benefits in the treatment of hypercholesterolemia, while decreasing adverse side effects. To investigate whether there are pharmacokinetic interactions among ATV, its metabolite 2-hydroxy atorvastatin (2-ATV), and NG, in the current study, we developed and validated a simple, rapid, and specific UPLC-MS/MS method to simultaneously determine the concentrations of these analytes in the rat plasma. Sample preparation was performed using simple protein precipitation. Chromatographic analysis was carried out on an Acquity UPLC BEH C18 column (1.7 μm, 2.1 × 100 mm) using gradient elution mode, and these three analytes were detected using a Xevo® TQD triple quadrupole tandem mass spectrometer, in the positive ion electrospray ionization interface. The developed method showed good linearity over the following concentrations in rat plasma samples: 3-1200 ng/ml (r = 0.9965) for ATV, 1.5-600 ng/ml (r = 0.9934) for 2-ATV, and 3-1200 ng/ml (r = 0.9964) for NG. The assays were validated and satisfied the acceptance criteria recommended by U.S. Food and Drug Administration guidelines. Upon successful application of the method to a pharmacokinetic interaction study, the results indicated that NG significantly enhanced the bioavailability of ATV and 2-ATV.

Current overview and perspectives in environmentally friendly microextractions of carbamates and dithiocarbamates

Carbamates and dithiocarbamates are two classes of pesticides widely employed in the agriculture practice to control and avoid pests and weeds, hence, the monitoring of the residue of those pesticides in different foodstuff samples is important. Thus, this review presents the classification, chemical structure, use, and toxicology of them. Moreover, it was shown the evolution of liquid- and solid-phase microextractions employed in the extraction of carbamates and dithiocarbamates in water and foodstuff samples. The classification, operation mode, and application of the microextractions of liquid-phase and solid-phase used in their extraction were discussed and related to the analytical parameters and guidelines of green analytical chemistry.