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Synthesis, Structural Characterization and Electrochemical Evaluation of Schiff Base Transition Metal Complexes with Ceftazidime
Derya Tarinc, Harun Muslu, Mustafa Cesme, Ayşegül Gölcü, Mehmet Tumer and Sibel A. Ozkan
[Abstract] [FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00069]
Electrochemical Study of the Interaction between the Antibacterial Drug Gemifloxacin and dsDNA Using Pencil Graphite Electrode
Burçin Bozal, Burcu-Dogan Topal, Bengi Uslu, Sibel A. Ozkan and Hassan Y. Aboul-Enein
[Abstract] [FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00070]
Electrochemical Biosensor Immobilization of Formaldehyde Dehydrogenase with Nafionfor Determination of Formaldehyde from Indian Mackerel (Rastrelligerkanagurta) Fish
Nur Indang Marzuki, Fatimah Abu Bakar, Abu Bakar Salleh, Lee Yook Heng, Nor Azah Yusof and Shafiquzzaman Siddiquee
[Abstract] [FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00071]
Metal/Metal Oxide Micro/Nanostructured Modified Gcpe for Gsh Detection
Meliha ÇUBUKÇU, F. NIL ERTAŞ and ÜLKÜ ANIK
[Abstract] [FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00072]
Determination of Trace Amounts of Cr(Iii) in Water Samples by Flame Atomic Absorption Spectrometry
Gulsin Arslan
[Abstract] [FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00073]
Abstracts
Synthesis, Structural Characterization and Electrochemical Evaluation of Schiff Base Transition Metal Complexes with Ceftazidime
Derya Tarinc, Harun Muslu, Mustafa Cesme, Ayşegül Gölcü, Mehmet Tumer and Sibel A. Ozkan
[FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00069]
In this study, transition metals (Cu(II), Co(II), Ni(II), Fe(III) and Ru(III)), complexes of Schiff base derived from (6R,7R,Z)-7-(2-(2-aminothiazol-4-yl)-2-(2-carboxypropan-2-yloxyimino)acetamido)-8-oxo-3-(pyridinium--ylmethyl)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylate, Ceftazidime; CFZ) and p-dimethylaminobenzaldehyde (DAB) were prepared and characterized by the analytical and spectroscopic methods. The analytical data show the composition of the metal complex to be [M(CFZ-DAB)Cln]Cl, where CFZ-DAB is the Schiff base ligand and n=1 for Cu(II), Co(II), Ni(II) and n=2 for Fe(III) and Ru(III) complexes. The conductance data indicate that all the complexes are strong-electrolytes. The compound (CFZ-DAB) behaves as a tridentate ligand. But, obtained complexes have mononuclear nature. The electrochemical properties of the metal complexes were investigated by cyclic voltammetry (CV) using glassy carbon electrode. The oxidation/reduction of metal complexes wasirreversible/reversible and exhibited diffusion controlled process depending on pH. The dependence of intensities of currents and potentials on pH, concentration, scan rate, nature of the buffer was investigated. The oxidation/reduction mechanism was proposed and discussed.
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Electrochemical Study of the Interaction between the Antibacterial Drug Gemifloxacin and dsDNA Using Pencil Graphite Electrode
Burçin Bozal, Burcu-Dogan Topal, Bengi Uslu, Sibel A. Ozkan and Hassan Y. Aboul-Enein
[FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00070]
Gemifloxacin (GMF) is a broad-spectrum quinolone antibacterial agent used in the treatment of acute bacterial exacerbation of chronic bronchitis and mild-to-moderate pneumonia. The investigation of the GMF - double-stranded DNA (dsDNA) interaction using an electrochemical DNA-biosensor showed for the first time clear evidence of interaction with dsDNA. The interaction between GMF and dsDNA onto pencil graphite electrode (PGE) was assessed at pH 4.80 acetate buffer using differential pulse voltammetry (DPV). The interaction mechanism was disclosed with decrease of the guanine oxidation peak current. The changes in the experimental parameters such as the accumulation time and the concentration of GMF were studied. Linearity of the guanine oxidation signals was obtained in response to the range of 0.5 – 8.0 μg/mL GMF. Detection and quantification limits in the range of μg/mL were determined.
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Electrochemical Biosensor Immobilization of Formaldehyde Dehydrogenase with Nafionfor Determination of Formaldehyde from Indian Mackerel (Rastrelligerkanagurta) Fish
Nur Indang Marzuki, Fatimah Abu Bakar, Abu Bakar Salleh, Lee Yook Heng, Nor Azah Yusof and Shafiquzzaman Siddiquee
[FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00071]
An electrochemical biosensor was developed based on formaldehyde dehydrogenase immobilized with Nafion membrane for determination of formaldehyde in fish. The enzyme was immobilized through the entrapment technique and measured based on the reduction of β-nicotinamide adenine dinucleotide. The response time of the formaldehyde biosensor was <1 min, with an optimum pH of 8. The optimum enzyme loading and NAD+ concentrations were found at 30 mg/mL and 0.5 mM, respectively. Using the formaldehyde biosensor, a linear response of formaldehyde showed a range of 0.1 to 10 ppm and a detection limit of 0.016 ppm. In application of Nash method, the samples were stored at 4°C ± 1 for 10 days. With the two combined methods, a linear correlation coefficient with R2 = 0.9982 (y = 0.956x - 0.014) was found. The developed formaldehyde biosensor showed a good reproducibility,longstorage stability (more than 6 months stored at 4°C), and also effective monitoring of formaldehyde level in Indian mackerel (Rastrelligerkanagurta) fish.
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Metal/Metal Oxide Micro/Nanostructured Modified Gcpe for Gsh Detection
Meliha ÇUBUKÇU, F. NIL ERTAŞ and ÜLKÜ ANIK
[FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00072]
A micro/nanostructured composite electrode was constructed by introducing various portions of aluminum titanate nanopowder and gold nanoparticle into glassy carbon paste electrode and used for glutathione (GSH) detection. After the optimization of experimental parameters, the analytical characteristics of the developed system were investigated. Two linear ranges between 5-50 μM and 100-750 μM with the equation y = 0.0028x+0.0102 and y= 4e-5x+ 0.227 with the correlation coefficients of R2= 0.9943 and R2= 0.9878 were obtained.
Relative standard deviation value was calculated for 250 µM GSH (n=6) and found as 6.66 %. The developed sensor was also applied for the detection of GSH in wine sample and human urine sample by using standard addition method. Data obtained from the sample application part showed that this novel nanocomposite response was not affected by the sample matrix and the nature without needing any laborious sample pretreatment procedures.
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Determination of Trace Amounts of Cr(Iii) in Water Samples by Flame Atomic Absorption Spectrometry
Gulsin Arslan
[FULL-TEXT INQUIRY] [BSP/CAS/E-Pub/00073]
A fast and effective microextraction technique are proposed for determination of trace amounts of Cr(III) in water samples using ultrasound-assisted emulsification-microextraction (USAEME) followed by flame atomic absorption spectrometry (FAAS). In the proposed approach, sodium diethyldithiocarbamate trihydrate solution (NaDDTC.3H2O) was used as a chelating agent and chloroform was selected as extraction solvent. After determination of the most suitable solvent and extraction time, some effective parameters such as extraction solvent volume, temperature, and pH were investigated and optimized. The optimized USAEME procedure used 100 μL of chloroform, 20 min of extraction with no ionic strength adjustment at 50 °C and 5 min of centrifugation at 4000 rpm. The method was applied to the analysis of tap, well, dam and industrial waste water samples and the Trace Metals in Drinking Water standards CRM-TMDV. The detection limit for Cr(III) was 0.079 μg L−1with an enrichment factor of 95, and the relative standard deviation was 2.8-1.1% (n=8, c=500 μg L−1). The proposed USAEME procedure has been demonstrated to be viable, simple, rapid and easy to use for residue analysis separation of Cr(III).
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