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1

pH-metric Study of Some Transition Metal Complexes of Gabapentin and Homocycloleucine

Jalali F., Shahbazi A. R.

Polish Journal of Chemistry

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2008

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Vol. 82, nr 11

2207-2213

2

Micellar-enhanced spectrofluorimetric determination of ketoconazole in cetyltrilethylammonium bromide medium

Jalali F., Afshoon A., Shamsipur M.

Chemia Analityczna

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2007

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Vol. 52, No. 1

115-123

EN

Fluorescence of ketoconazole at 370 nm has been found to be greatly enhanced in miceilar solutions of cetyltrimethylammonium bromide (CTAB). Under optimum conditions (0.05 mol L-1 CTAB and pH 7.2), ketoconazole was determined in the concentration range 0.02-10 mg L-1 (3.76 x 10-8mol L-11.88 x 10-1 mol L-1), detection limit was 0.02 mg L-1 (3.76 x 10-8 mol L-1)' The method was successfully applied to the determination of low- concentrations of ketoconazole in pharmaceutical preparations and blood serum sample.

PL

Stwierdzono, że fluorescencja ketokonazolu przy 370 nm ulega znacznemu wzmocnieniu w micelarnych roztworach bromku cetylotrimetyloamoniowego (CTAB). W optymalnych warunkach (0,05 mol L-1 CTAB, pH 7,2) ketokonazol został oznaczony w zakresie stężeń 0.02-10 mg L-1 (3.76 x10-8mol L-11,88 x 10"5 mol L-1), granica wykrywalności 0,02 mg L-1 (3.76 x 10-5 mol L-1). Metodę z powodzeniem zastosowano do oznaczania niskich stężeń ketokonazolu w preparatach farmaceutycznych i w próbkach krwi.

3

Numerical Algorithms for Determination of Retrograde Region of Gas Condensate Reservoir

Tarom N., Jalali F., Al-Sayegh A., Moshfeghian M.

Polish Journal of Chemistry

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2006

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Vol. 80, nr 1

51-64

EN

Twomathematical algorithms based on a cubic EOS are developed to determine the retrograde region for reservoir fluids. The first method is based on marching and the second one utilizes regression analysis. In marching method, a series of flash calculations is performed to calculate maximum L/F (moles of liquid/moles of feed). In the regression method, a non-linear regression and an optimizationmethod in addition to a limited number of flash calculations are used to determine the maximum L/F. Based on these mathematical algorithms a computer program to predict a full phase envelope containing the retrograde curve was developed. The computer program consists of three basic parts of bubble point, dew point, and flash calculations. These three basic parts are used to determine the retrograde region. In the course of determination of the retrograde condensation region, the coordinates of critical point and cricondentherm point were also determined and used to speed up the search method. Several cases were studied and it was found that the regression method is faster and more accurate.

4

Synthesis, X-ray Crystal Structure and Solution Studies of Cu(II) Complexes of a Pyridine Containing Self-Assembling System

Ranjbar M., Taghavipur M., Aghabozorg H., Moghimi A., Jalali F., Shamsipur M.

Polish Journal of Chemistry

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2002

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Vol. 76 / nr 6

785-794

EN

The complexation of a novel pyridine containing self-assembling system LH2, ([pyda_H2] [pydc] (pyda = 2,6-pyridinediamine and pydc_H2 = 2,6-pyridinedicarboxylic acid), with copper(II) acetate leads to the formation of an anionic self-assemble coordination compound, [(pyda_H)]2[Cu(pydc)2]_H2O. The crystal system is monoclinic with a space group P21/n and contains four molecules per unit cell. The unit cell dimensions are: a = 8.2567(19) A, b = 13.097(31) A, c = 23.384(6) A and _ = 94.685(5)_. The four carboxylate groups of two dianions are oriented in a flattened tetrahedral arrangement and the two dianionic units are almost perpendicular to each other. The axial N-Cu-N angle shows 2.65_ deviation from linearity. The complexation reactions in aqueous solution were investigated by potentiometric pH titrations and the equilibrium constants for all major complexes formed are described. The results are presented in the form of distribution diagrams revealing the concentration of individual complex species as a function of pH. The results revealed that, at pH = 4-5, the major complex species in solution is [(pyda_H)]2[Cu(pydc)2].

5

Acid-base titrimetric determination of ketoconazole and miconazole in micellar media

Shamsipur M., Jalali F.

Chemia Analityczna

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2002

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Vol. 47, No. 6

905-911

EN

A simple and accurate pH-metric method is described for the determination of two sparingly soluble in water antifungal drugs: ketoconazole and miconazole. Cetyltrimethylammo-nium bromide and sodium dodecylsulfate micelles have been used to solubilize these compounds. The application of the proposed method to the analysis of pharmaceutical preparations of the related species gave satisfactory results. Simplicity and the absence of harmful organic solvents in this method makes it possible to be used in routine analyses.

PL

Opisano prostą i dokładną metodę pehametryczną oznaczania dwóch trudno rozpuszczalnych w wodzie leków przecigrzybicznych: ketokonazolu i mykonazolu. Do poprawy rozpuszczalności użyto bromku cetylotrimetyloamoniowego, oraz dodecylosiarczanu sodowego. Opracowaną metodę zastosowano z powodzeniem w analizie preparatów farmaceutycznych zawierających wyżej wspomniane związki. Metoda nadaje się do zastosowania w analizach rutynowych ze względu na prostotę i nieobecność szkodliwych rozpuszczalników organicznych.