Wyniki wyszukiwania - Biblioteka Nauki

1

Determination of the Dexlansoprazole in Bulk and Spiked Human Plasma by Extraction Spectrophotometry

100%

Sekharan C. B. , Rao M. P. , Mahesh M. , Chandramouli I. , Seemanth J.

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tom Vol. 52

28--38

EN

This paper describes a simple extraction spectrophotometric method for the quantification of dexlansoprazole in bulk and spiked human plasma. This method involves formation of stable yellow colored chloroform extractable ion-pair complex of the amino derivative of dexlansoprazole with acid dye, namely methyl orange in acidic medium. The ion-pair complexes exhibit absorption maxima at 425 nm. Dexlansoprazole can be determined up to 4-40 μg/mL by the proposed method. The effect of optimum reagent concentration was studied. The relative standard deviations (≤1. 246%) obtained in the intra-day and inter-day analyses were found to be satisfactory. The accuracy results exhibited the mean recovery and percentage error in the range of 99.137%–100.574% and 0.012%–0.863%. When applied for the assay of the dexlansoprazole in spiked human plasma sample, recovery mean values ranged from 96.495–98.960%. The proposed method is useful for the estimation of the dexlansoprazole in bulk and human plasma samples.

2

An approach based on diffusion to study ligand-macromolecule interaction.

100%

Housaindokht M. R. , Bahrololoom M. , Tarighatpoor S. , Mossavi-Movahedi A. A.

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tom 49

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nr 3

703-707

EN

A new approach has been developed to study binding of a ligand to a macromolecule based on the diffusion process. In terms of the Fick's first law, the concentration of free ligand in the presence of a protein can be determined by the measurement of those ligands which are diffused out. This method is applied to the study of binding of methyl-orange to lysozyme in phosphate buffer of pH 6.2, at 30°C. The binding isotherm was determined initially, followed by application of the Hill equation to the data obtained, then binding constant and binding capacity were estimated.

3

The Efficiency of Mg-Al/Biochar for Methyl Orange and Methyl Red Removal

88%

Badri A. F. , Juleanti N. , Mohadi R. , Mardiyanto , Lesbani A.

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tom Vol. 23, iss. 1

202--211

EN

MgAl-LDH was directly impregnated with biochar to fabricate MgAl-Biochar (MgAl/BC) and applied to remove methyl orange (MO) and methyl red (MR). The XRD, BET, FTIR, TG-DTA and SEM analyses were conducted to characterize the prepared material. The result of XRD characterization diffraction peaks at 11.47, 22.86, 34.69, and 61.6 shows that the precursor was successfully transformed to MgAl-BC. The FT-IR analysis at vibration 1010, 1381,3447 and 1635 cm-1 illustrated that the composite was well formed. The BET analysis showed that the Surface area of the MgAl-BC composite was 111.404 m2/g which was larger than that of the precursor, equal to 23.15 m2/g. The kinetic model of the adsorption study both MR and MO were fitted to PSO and followed the Langmuir model with adsorption capacities for MR 142.857 mg/g and MO 128.205 mg/g. The regeneration study of composite indicated higher efficiency than the pristine and show good stability of adsorption process in five cycles.

4

Azo dye wastewater treatment in a novel three-dimensional electrode reactor

63%

Zou H. , Sun Z. , Jiao Z. , Wang Y.

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tom Vol. 48, nr 2

5--13

EN

A novel three-dimensional electrode reactor (3DER) was designed to treat the dye wastewater. The performance of 3DER was evaluated via methyl orange (MO) removal efficiency. For comparison, the performance of the two-dimensional electrode reactor (2DER) was also assessed. Furthermore, the effects of electrolyte and aeration on treatment performance were preliminarily evaluated to further optimize the operation on 3DER. A repeatable and stable MO treatment efficiency was obtained in the 3DER. The MO removal rate reached 79.5% at the applied voltage of 1.0 V, electrode spacing of 2 cm and initial MO concentration of 60 mg/dm3, significantly higher than that in the 2DER (58.8%), suggesting the obvious improvement of particle electrodes on MO removal. Both adding electrolyte and air sparging into the 3DER contributed to the enhancement of the MO removal rate. These results obtained here suggest that the 3DER may provide an effective alternative for the treatment of azo dye wastewater and/or non-biodegradable industrial wastewaters.

5

Preparation of activated carbons with enhanced adsorption of cationic and anionic dyes from Chinese Hickory husk using the Taguchi method

51%

Cao Y. , Pawłowski A. , Zhang J.

Environment Protection Engineering

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2010

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tom Vol. 36, nr 3

69-86

EN

Waste Chinese Hickory husk biomass was used as a precursor in the preparation of low-cost activated carbon by ZnCl2 activation. The activated carbon was to be used for the removal of both cationic and anionic dyes - methylene blue (MB) and methyl orange (MO). The preparation parameters, including impregnation ratio (the mass ratio of ZnCl2 to the precursor), the activation temperature, the activation time and the impregnation time, were evaluated. The Taguchi method, in combination with analysis of variance (ANOVA), was used to determine the effects of the preparation parameters on the dye adsorptive capacities of the activated carbon, and to optimize preparation conditions with the goal of maximizing its adsorptive capacities. The optimized conditions were an impregnation ratio of 2.0 g/g, an activation temperature of 550 oC and an activation time of 60 min. In such an optimal combination of parameters, the adsorption of MB and MO was expected to reach approximately 400 mg/g and 900 mg/g, respectively. The activation temperature had the most significant effect on the carbon capacity to adsorb MB and MO. The impregnation ratio had a significant effect on the adsorption of both dyes with the trend towards higher adsorption at higher impregnation ratio, while the activation time and the impregnation time were found to be insignificant.

6

Badania adsorpcji wybranych barwników z roztworów wodnych na nanoporowatych materiałach węglowych w warunkach dynamicznych

44%

Czubaszek M. , Choma J.

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tom Vol. 40, nr 3

3--8

PL

Badano adsorpcję dynamiczną trzech barwników: oranżu metylowego (OM), oranżu II (OII) i błękitu metylenowego (BM) z roztworów wodnych na czterech materiałach węglowych. Były to: zredukowany tlenek grafenu (rGO) otrzymany metodą chemiczną, mikroporowaty węgiel otrzymany z prekursora polimerowego – sulfonowanej żywicy styrenowo-diwinylobenzenowej (AC-SDVB), mezoporowaty, uporządkowany materiał węglowy otrzymany metodą miękkiego odwzorowania z żywicy fenolowo-formaldehydowej (OMC-PF) oraz handlowy węgiel aktywny (AC-F400). W dynamicznych badaniach kolumnowych wyznaczono krzywe przebicia tych adsorbentów, a do opisu krzywych przebicia złoża węgla wykorzystano równania Thomasa oraz Yoona-Nelsona. Uzyskane wartości adsorpcji dynamicznej barwników były duże, szczególnie w przypadku mikroporowatego węgla AC-SDVB oraz zredukowanego tlenku grafenu. Stwierdzono, że największą adsorpcją dynamiczną charakteryzował się zredukowany tlenek grafenu, który adsorbował oranż II w ilości 706 mg/g. Wykorzystane równania Thomasa i Yoona-Nelsona dobrze opisywały krzywe przebicia złoża węgla (R2=0,97÷0,99).

EN

Dynamic adsorption of three dyes was studied: methyl orange (OM), orange II (OII) and methylene blue (MB) from aqueous solutions on four carbon materials. These were: reduced graphene oxide (rGO) obtained by the chemical method, microporous carbon prepared from a polymeric precursor – sulfonated styrene-divinyl benzene resin (AC-SDVB), ordered mesoporous carbon material obtained by soft templating from phenol-formaldehyde resin (OMC-PF) and the commercial activated carbon (AC-F400). Breakthrough curves for the above adsorbents were determined in dynamic column experiments and Thomas and Yoon-Nelson equations were used to describe them. Dynamic dye adsorption values were high, especially for AC-SDVB microporous activated carbon and reduced graphene oxide. The highest dynamic adsorption was demonstrated for the reduced graphene oxide, rGO, which adsorbed 706 mg/g of orange II. The equations of Thomas and Yoon-Nelson well described the breakthrough curves for the carbon bed with correlation coefficients R2 = 0,97÷0,99.