Determination of xylometazoline in plasma and urine by gas chromatography using a fused-silica capillary column and an electron-capture detector

A screen printed methodology optimized by molecular dynamics simulation and Lean Six Sigma for the determination of xylometazoline in the presence of benzalkonium chloride in nasal drops

A new chemically disposable screen-printed modified electrode with yttrium doped manganese oxide (Mn2O3/Y2O3) nanocomposite at screen printed electrode was mainly constructed to quantify xylometazoline hydrochloride (XMZ). The crystallographic parameters were estimated from the XRD spectrum, suggesting that Mn₂O₃ of cubic phase with average grain size ∼ 77 nm. The SEM images revealed that Y³⁺ dopants had improved the surface topology. The findings indicate that morphological features play a vital role in improving the electronic properties of the fabricated electrode. Augmentation of Six Sigma (SS) with molecular dynamics simulation (MD) as a theoretical study was widely adopted to improve the current process as a quality management methodology by measuring the process capability to determine if the process meets the desired specification limits. Process capability is determined through measuring the variability in the process output and comparing these variations with the desired specifications. Also, it assures a robust method specification at a high level of targeted performance and statistical confidence. A greenness assessment procedure utilizing the eco-scale algorism was conducted to prove the greenness of the proposed methodology. Additionally, the proposed sensor presented a high sensitivity over the concentration range (1x10^-6-1x10^-2 mol L^-1) of a detection limit 3.93 × 10^-7 mol L^-1 with the Nernstian cationic slope of 58.18 ± 0.76 mV decade^-1 at 25 ± 1 °C.

Simultaneous Determination of Cromolyn Sodium Combined Dosage Forms Using Isocratic HPLC Method

A simple and selective reversed-phase high-performance liquid chromatography method was developed for the estimation of cromolyn sodium (CRM) with either oxymetazoline hydrochloride (OMZ) or xylometazoline hydrochloride (XMZ) in their binary mixtures. The method is based on the simultaneous separation of each drug in a reversed-phase Waters symmetry^® C18 column (250 mm × 4.6 mm intradermally, 5-µm particle size) at 25°C. Elution was performed with a mobile phase consisting of methanol : 0.1 M phosphate buffer (60:40, v/v, pH 4.0). Quantitation was achieved with ultraviolet detection at 220 nm. The method could determine the three drugs, with linearity, in the range of 2.0-100.0 µg/mL for CRM and 0.8-8.0 µg/mL for OMZ and for XMZ. Aspirin was used as internal standard. Optimization of the separation in terms of mobile phase composition is critical to the method development, which is discussed in detail. The suggested procedure was successfully applied to the analysis of the studied drugs in their nasal preparations. Statistical evaluation of the data obtained by the proposed and comparison methods revealed good accuracy of the proposed method.

High-performance liquid chromatographic method for the assay of dexamethasone and xylometazoline in nasal drops containing methyl p-hydroxybenzoate

A rapid and sensitive high-performance liquid chromatographic method has been developed for the determination of dexamethasone sodium phosphate (DSP), xylometazoline hydrochloride (XMC) and methyl p-hydroxybenzoate (MHB). An assay of the compounds has been performed on a HPLC system GBC 1210, at controlled room temperature, on a Nucleosil C8 column (250x3 mm, 5 microm). The mobile phase was acetonitrile-water (35:65, v/v), at a flow-rate of 1 ml min(-1). The parameters for validation such as linearity (r>0.9996), precision (RSD: 0.51-(1.93%), limit of detection and quantification (2.032 x 10(-4) and 4.063 x 10(-4) mg ml(-1) for DSP, 9.7 x 10(-5) and 1.953 x 10(-4) mg ml(-1) for XMC, 1.953 x 10(-4) and 3.096 x 10(-4) mg ml(-1) for MHB) have also been reported. The method was applied to the determination of DSP, XMC and MHB in nasal drops. The statistical parameters were found to be satisfactory, with recovery values ranging from 98.69 to 101.60% (RSD: 0.32-1.03%). The method is simple and accurate and therefore suitable for the simultaneous determination of these compounds in dosage form.