Current Analytical Chemistry - Volume 11, Issue 3, 2015

Certified reference materials (CRMs) play vital roles in method validation and quality assurance of assessment measurements. In this paper, a new CRM for sulfamethoxazole (SMZ) was prepared. Purity determination and uncertainty evaluation methods were developed using mass balance (MB) and differential scanning calorimetry (DSC) methods. Impurities including moisture, volatile components, and inorganic components wer Read More

In recent years, material characterization with functional properties has been a focus of interest to be used in devices like biosensors; in this work a photochromic material was used as an (essential) main component of an optical transducer. The goal of this article was to develop an experimental protocol for building an optical transducer based on a spiropyran, in recognition of properties (features) they manifest for binding molec Read More

L-glutathione decorated Mn doped ZnS QDs (GSH-Mn: ZnS QDs) were synthesized in aqueous solution. The characterization of as-prepared QDs was carried out through fluorescence, ultraviolet-visible absorption (UV-vis), TEM and Fourier transform infrared spectroscopy (FTIR). Pb2+ had obvious quenching effect on the fluorescence intensity of GSH-Mn: ZnS QDs. Under optimal factors, a nice linear relationship between th Read More

Background: Tadalafil is an oral drug that is used for treating erectile dysfunction (impotence) and pulmonary arterial hypertension. It relaxes muscles and increases blood flow to particular areas of the body. Objective: The present study was aimed to investigate the different pharmacokinetic parameters of the two different formulations of Tadalafil (CAS no. 171596-29-5), one is conventional tablet dosage for Read More

In this research, greener chromatography employing a more eco-friendly microemulsion mobile phase was utilized for the analysis of rosiglitazone (ROS) and glimepiride (GLM) in rat sera. ROS, GLM, and darfenacin (an internal standard) were detected using UV wavelength of 237 nm. HPLC analysis by using a monolithic column was performed by directly injecting the sample after appropriate dilution with the mobile phase. T Read More

Anatase nano titanium oxide was used as a sorbent for the separation and preconcentration of selenium(IV) from liquor. The selenium was determined by hydride generation-atomic fluorescence spectrometry (HG-AFS) with KBH4-HCl. The results showed that the adsorption percentage of selenium( IV) was 92% at pH 4-6, and the elution by NaOH reached 95%. The adsorption equilibrium accorded with the Langmuir isot Read More

Separation of several isomer groups, i.e. diastereomers such as quinine and quinidine, cinchonine and cinchonidine, R,S-1-(1-naphthyl)-ethanol, R,S-1-(2-naphthyl)-ethanol, and R,S-1,1’- binaphthyl-2,2’-diamine racemates by means of high-performance thin layer chromatography (HPTLC) as well as pressurized planar electrochromatography (PPEC) techniques and carried out with the use of HPTLC RP-2, HPTLC RP-8 and HPTL Read More

In this study, multi-walled carbon nanotubes (MWCNTs) and vitamin B12 (VB12) were fabricated on the surface of glassy carbon electrode (GCE). This modified electrode (MWCNTs/VB12/GCE) was designed to determine p-hydroxyacetophenone (p-HYD) by square wave voltammetry. The MWCNTs/VB12 film was characterized by Electrochemical impedance spectroscopy and Fourier transform infrared spectroscopy, which Read More

In this study the analytical determination of gold and palladium in jewelry alloys was achieved by means of one shot potentiometric titration. The practical aspects of this procedure were investigated and discussed in order to define the optimal conditions for the simultaneous quantitative determination of the two elements using commercially-available equipment (Mettler-Toledo DL-50 automatic titrator and DS500 electrod Read More

The flavone C-glycosides in Viola yedoensis have been reported as the major active antiinflammatory, anti-cancer, and antioxidant components. However, due to the difficulty in obtaining standard compounds, little work has been done on the quantitative analysis of the multiple major flavone C-glycosides in V. yedoensis. In this study, a microwave-assisted extraction (MAE) and high performance liquid chromatography-electros Read More