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Journal Cover Analytical and Bioanalytical Chemistry Research
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  This is an Open Access Journal Open Access journal
   ISSN (Online) 2383-093X
   Published by Iranian Chemical Society Homepage  [3 journals]
  • Determination of Acidity Constants of p-Rosolic acid and Bromoxylenol Blue
           by Solution ...

    • Abstract: Recently solution scanometry, as a new, simple, fast, portable, and economic method was introduced for determination of acidity constants of indicator and dyes. In this study, a method was applied for the determination of the acidity constant of p-Rosolic acid (RA) and Bromoxylenol blue (BXB) indicators. The method is based on scanning of Plexiglas® sheet containing colored solutions with a flatbed scanner. The obtained images were analyzed to red, green, and blue (RGB) values using software written in visual basic 6. For comparison, the acidity constants of the indicators were determined by spectrophotometric method using the Hypspec program. The corresponding distribution diagrams were also drawn through the Hyss2009 program. The comparison between the presented and traditional UV-Vis spectrophotometric method was performed, and similar trends in results of both methods were observed. The obtained values of pKa by solution scanometric and spectrophotometric method showed good agreement with corresponding values which were reported in the literature.
      PubDate: Tue, 31 Jul 2018 19:30:00 +010
  • Application of Mixed Micelle-Mediated Extraction for Selective Separation
           and ...

    • Abstract: A procedure for separation/preconcentration of para-aminophenol (PAP) in pharmaceutical formulation, based on cloud point extraction (CPE) as a prior step to determination by UV-Vis spectrophotometry has been developed. The analyte reacted with 4-dimethylamino benzaldehyde (DAB) in acidic media to form a shift base, which were separated and preconcentrated in a mixed micelle of the anionic surfactant sodium dodecylsulfate (SDS) and the nonionic surfactant Triton X-114. The parameters affecting the extraction efficiency of the proposed method, such acid concentration, reagent concentration, amount of surfactants, and incubation time were optimized. Under the optimum conditions, the linear range was 50-1000 ng ml-1 of PAP with a correlation coefficient (r) of 0.998. The limit of detection was 30 ng ml-1. Relative standard deviation (RSD) for five replicate determinations of 200 ng ml-1 PAP was 1.4 %. In this work, the concentration factor of 10 was reached. Also the improvement factor of the proposed method was 3.3. The proposed method was successfully applied for determination of p-aminophenol in pharmaceutical formulations. The advantages of this method are simplicity of operation, rapidity and low cost.
      PubDate: Tue, 31 Jul 2018 19:30:00 +010
  • Ion Pair Dispersive Liquid-Liquid Microextraction for the Determination of
           Trace Amounts of ...

    • Abstract: Ion pair dispersive liquid- liquid microextraction (IP-DLLME) method combined with flame atomic absorption spectrometry was proposed for the determination of trace amounts of copper(II). By using pyrocatechol violet as chelating agent and cetyltrimethyl ammonium bromide as an ion pairing agent, the trace amount of copper(II) was extracted in chloroform. The factors influencing the formation copper-ligand complex and the extraction efficiency such as, sample pH, extraction time, type and volume of extraction solvent and dispersive solvent, ion pair and ligand concentration were optimized. Under optimum experimental conditions, the enhancement factor of 10.0 was obtained from only 5.0 ml of aqueous phase. The linear dynamic range and the detection limit were 6.0 - 100 μg l-1 and 3.7 mg l-1, respectively. The relative standard deviation for ten replicate determinations of 40.0 µg l-1 of Cu2+ was 1.9 %. Developed method was successfully applied for determination of copper in soil, multivitamin tablet, tea and water samples with good spike recoveries.
      PubDate: Tue, 31 Jul 2018 19:30:00 +010
  • A Nano-Composite Based on Fe3O4@Styrene-Maleic Anhydride Copolymer as a
           Magnetic Sorbent for ...

    • Abstract: A magnetic nano-composite based on modified styren-maleic anhydride copolymer and Fe3O4 nano-particles was introduced as a new sorbent for solid-phase extraction and preconcentration of trace levels of silver ion from aqueous solutions. The size and morphology of the nano-sorbent were characterized via X-ray diffraction analysis, scanning electron microscopy and Fourier transform infrared spectroscopy. Following its desorption with hydrochloric acid, silver was detected by flame atomic absorption spectrometry. Different variables affecting the separation/pre-concentration of the silver ion were optimized. Under the optimized conditions, the calibration graph was linear in the 1–200 µg L–1 concentration range, with a correlation coefficient of 0.9991. The limit of detection and relative standard deviation for six replicate determinations at a silver ion level of 100 µg L–1 were 0.3 µg L–1 and 1.1 %, respectively. The preconcentration factor and adsorption capacity of the sorbent for silver ion were 100 and 78.2 mg g–1, respectively. The accuracy of the method was confirmed by analyzing the certified reference material NIST SRM 1566b. The method was successfully applied to determine silver ion in water samples and in radiology films, and satisfactory recoveries were obtained in the range of 96.8–99.6 % for the spiked samples.
      PubDate: Tue, 31 Jul 2018 19:30:00 +010
  • Fabrication of an Electrochemical Sensor Based on a New Nano-ion Imprinted
           Polymer for Highly ...

    • Abstract: In this work a new chemically modified carbon paste electrode was constructed for accurate, simple, sensitive and selective determination of molybdenum (VI) ions. The results of modified electrode by an ion imprinted polymer were compared with those obtained with carbon paste electrode. The results showed the stripping peak currents had a dramatic increase at the modified electrode. Under the optimal conditions, the linear dynamic range and limit of detection were 0.2-500.0 and 0.04 ng mL-1, respectively. The relative standard deviation for five successive measurements of 5.0 and 20.0 ng mL-1 of Mo(VI) ions were 1.8 and 1.4 %, respectively. The reproducibility and stability of the designed modified electrode response were also investigated. By examining the effect of different cations and anions on the determination of the target ion, it was found that the electrode is highly selective for the determination of Mo(VI) ions. Furthermore, the present method was applied to the determination of Mo in real samples with satisfactory results.
      PubDate: Tue, 31 Jul 2018 19:30:00 +010
  • Voltammetric Determination of Tryptophan Using a Carbon Paste Electrode
           Modified with Magnesium ...

    • Abstract: A novel carbon paste electrode modified with ionic liquid (n-hexyl-3-methylimidazolium hexafluoro phosphate) and magnetic core-shell manganese ferrite nanoparticles (MCSILCPE) was fabricated. The electrochemical study of the modified electrode, as well as its efficiency for electro-oxidation of tryptophan, is described. Cyclic voltammetry (CV), choronoamperometry (CHA) and square wave voltammetry (SWV) were used to investigate oxidation of tryptophan in aqueous solution. The diffusion coefficient (D=3.53 ×10-6 cm2/s), was determined using electrochemical approaches. It has been found that under an optimum condition (pH 7.0), the oxidation of tryptophan at the surface of such an electrode occurs at a potential about 150 mV less positive than that of an unmodified carbon paste electrode. SWV exhibits a linear dynamic range from 5.0×10-6 to 4.0×10−4 M tryptophan. The morphology of the modified electrode was studied using SEM. The limit of detection was equal to 1.1×10-6 M. The electrode was also employed to determination of tryptophan in urine samples.
      PubDate: Tue, 31 Jul 2018 19:30:00 +010
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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Fax: +00 44 (0)131 4513327
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