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131 Newest Publications of Libertas Academica


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Determination of Xanthine in the Presence of Hypoxanthine by Adsorptive Stripping Voltammetry at the Mercury Film Electrode

09-Jun-2014 | Percio Augusto Mardini Farias and Arnaldo Aguiar Castro, Analytical Chemistry Insights, 2014

A stripping method for the determination of xanthine in the presence of hypoxanthine at the submicromolar concentration levels is described. The method is based on controlled adsorptive accumulation at the thin-film mercury electrode followed by a fast linear scan voltammetric measurement of the ...


Kinetic Study of the Alkaline Degradation of Oseltamivir Phosphate and Valacyclovir Hydrochloride using Validated Stability Indicating HPLC

27-May-2014 | Ramzia I. Al-Bagary, Asmaa A. El-Zaher, Fahima A. Morsy and Mai M. Fouad, Analytical Chemistry Insights, 2014

Aqueous alkaline degradation was performed for oseltamivir phosphate (OP) and valacyclovir hydrochloride (VA). Isocratic stability indicating the use of high-performance liquid chromatography (HPLC) was presented for each drug in the presence of its degradation product. The separations were ...


Spectrophotometric and Spectrofluorimetric Studies on Azilsartan Medoxomil and Chlorthalidone to Be Utilized in Their Determination in Pharmaceuticals

07-May-2014 | Walid M. Ebeid, Ehab F. Elkady, Asmaa A. El-Zaher, Ramzia I. El-Bagary and Gabor Patonay, Analytical Chemistry Insights, 2014

The recently approved angiotensin II receptor blocker, azilsartan medoxomil (AZL), was determined spectrophotometrically and spectrofluorimetrically in its combination with chlorthalidone (CLT) in their combined dosage form. The UV-spectrophotometric technique depends on simultaneous measurement ...


A UPLC–MS Method for the Determination of Ofloxacin Concentrations in Aqueous Humor

05-May-2014 | Panagiotis Plotas, Charalampos Anastasopoulos, Olga E. Makri, Michalis Leotsinidis and Constantine D. Georgakopoulos, Analytical Chemistry Insights, 2014

A rapid, simple, and specific method based on ultra performance liquid chromatography (UPLC) with mass spectrometry detection has been developed for quantitative analysis of ofloxacin in human aqueous humor using tobramycin as internal standard (IS). Chromatographic separation was achieved on a ...


Application of Nanofiber-packed SPE for Determination of Urinary 1-Hydroxypyrene Level Using HPLC

22-Apr-2014 | Okechukwu Clinton Ifegwu, Chimezie Anyakora, Samuel Chigome and Nelson Torto, Analytical Chemistry Insights, 2014

It is always desirable to achieve maximum sample clean-up, extraction, and pre-concentration with the minimum possible organic solvent. The miniaturization of sample preparation devices was successfully demonstrated by packing 10 mg of 11 electrospun polymer nanofibers into pipette tip micro ...


Buprenorphine and Norbuprenorphine Determination in Mice Plasma and Brain by Gas Chromatography–Mass Spectrometry

10-Mar-2014 | Fouad Chiadmi and Joël Schlatter, Analytical Chemistry Insights, 2014

A gas chromatography tandem mass spectrometry method for quantification of buprenorphine (BUP) and norbuprenorphine (NBUP) in brain and plasma samples from mice was developed and validated. Analytes were extracted from the brain or plasma by solid phase extraction and quantified within 20 ...


Synthesis and Characterization of Maillard Reaction Products of Salbutamol and Terbutaline with Lactose and Development and Validation of an LC Method for the Determination of Salbutamol and Terbutaline in the Presence of These Impurities

02-Mar-2014 | Asmaa A. El-Zaher, Marwa A. Fouad and Ehab F. Elkady, Analytical Chemistry Insights, 2014

Being secondary amines, both salbutamol (SLB) and terbutaline (TRB) react by Maillard reaction (MR) with lactose, which is added as an inactive ingredient in tablets. The Amadori rearrangement products were synthesized, isolated, and characterized by mass spectrometry. In addition, a simple, ...


The Evaluation of Two Commercially Available, Portable Raman Systems

10-Sep-2013 | Pamela A. Mosier-Boss and Michael D. Putnam, Analytical Chemistry Insights, 2013

Raman spectroscopy and surface enhanced Raman spectroscopy (SERS) have many attributes that make them attractive for field detection of environmental contaminants, industrial process control, as well as materials detection/identification in agriculture, pharmaceuticals, law enforcement/first ...


RP-LC and TLC Densitometric Determination of Paracetamol and Pamabrom in Presence of Hazardous Impurity of Paracetamol and Application to Pharmaceuticals

05-Sep-2013 | Ola Mohamed El-Houssini, Analytical Chemistry Insights, 2013

Two simple, accurate and reproducible methods were developed and validated for the simultaneous determination of paracetamol (PARA) and pamabrom (PAMB) in pure form and in tablets. The first method was based on reserved-phase high-performance liquid chromatography, on a Thermo Hypersil ODS column ...


Development of Methods for the Determination of pKa Values

08-Aug-2013 | Jetse Reijenga, Arno van Hoof, Antonie van Loon and Bram Teunissen, Analytical Chemistry Insights, 2013

The acid dissociation constant (pKa) is among the most frequently used physicochemical parameters, and its determination is of interest to a wide range of research fields. We present a brief introduction on the conceptual development of pKa as a physical parameter and its relationship to the ...


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