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Ganjali, Mohammad Reza,Norouzi, Parviz,Yousefian, Nasrin,Faridbod, Farnoush,Adib, Mehdi Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.10
A La (III) ion-selective membrane sensor has been fabricated from poly vinyl chloride (PVC) matrix membrane, containing 3-hydroxy-N'-(pyridin-2-ylmethylene)-2-naphthohydrazide (HPMN) as a neutral carrier, potassium tetrakis (p-chlorophenyl) borate (KTpClPB) as an anionic excluder and ortho-nitrophenyloctyl ether (NPOE) as a plasticizing solvent mediator. The effects of membrane composition and pH as well as the influence of the anionic additive on the response properties were investigated. The sensor with 30% PVC, 62% solvent mediator, 6% ionophore and 2% anionic additive, shows the best potentiometric response characteristics. It displays a Nernstian behavior (19.2 mV per decade) across the range of $1.0{\times}10^{-2}-1.0{\times}10^{-7}$ M. The detection limit of the electrode is $7.0{\times}10^{-8}$ M ($\sim$10 ng/mL) and the response time is 15 s from $1.0{\times}10^{-2}$ up to $1.0{\times}10^{-4} $M and 30 s in the range of $1.0 {\times}10^{-5}-1.0{\times}10^{-7}$ M. The sensor can be used in the pH values of 3.0-9.0 for about seven weeks. The membrane sensor was used as an indicator electrode in the potentiometric titration of lanthanum ions with EDTA. It was successfully applied to the lanthanum determination in some mouth wash preparations.
Norouzi, Parviz,Ganjali, Mohammad Reza,Faridbod, Farnoush,Salavati-Niasari, Masoud Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.9
A $Cu^{2+}$ ion-selective membrane microelectrode has been fabricated from poly vinyl chloride (PVC) matrix membrane containing a new symmetrical hexadentate Schiff,s base 2-{1-(E)-2-((Z)-2-{(E)-2-[(Z)-1-(2-hydroxyphenyl)ethylidene]hydrazono}-1-methylpropylidene)hydrazono]ethyl}phenol (HDNOS) as a neutral carrier, Potassium tetrakis(4-chlorophenyl) borate (KTpClPB) as an anionic excluder and o-nitrophenyloctyl ether (NPOE) as a plasticizing solvent mediator. The microelectrode displays linear potential response in the concentration range of $1.0\;{\times}\;10^{-5}-1.0\;{\times}\;10^{-11}$ M of $Cu^{2+}$. The microelectrode exhibits a nice Nernstian slope of 25.9 ${\pm}$ 0.3 mV $decade^{-1}$ in the pH range of 3.1-8.1. The sensor has a relatively short response time in whole concentration ranges ($\sim$5 s). The detection limit of proposed sensor is $5.0\;{\times}\;10^{-12}$ M (320 pg/L), and it can be used over a period of eight weeks. The practical utility of the sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of $Cu^{2+}$ with EDTA. The proposed membrane electrode was used for the direct determining of $Cu^{2+}$ content in black and red pepper, and in waste water samples.
Parviz Norouzi*,Mohammad Reza Ganjali,Farnoush Faridbod,Masoud Salavati-Niasari 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.9
A Cu2+ ion-selective membrane microelectrode has been fabricated from poly vinyl chloride (PVC) matrix membrane containing a new symmetrical hexadentate Schiff,s base 2-{1-(E)-2-((Z)-2-{(E)-2-[(Z)-1-(2-hydroxyphenyl)ethylidene]hydrazono}-1-methylpropylidene)hydrazono]ethyl}phenol (HDNOS) as a neutral carrier, Potassium tetrakis(4-chlorophenyl) borate (KTpClPB) as an anionic excluder and o-nitrophenyloctyl ether (NPOE) as a plasticizing solvent mediator. The microelectrode displays linear potential response in the concentration range of 1.0 10-5-1.0 10-11 M of Cu2+. The microelectrode exhibits a nice Nernstian slope of 25.9 0.3 mV decade-1 in the pH range of 3.1-8.1. The sensor has a relatively short response time in whole concentration ranges (~5 s). The detection limit of proposed sensor is 5.0 10-12 M (320 pg/L), and it can be used over a period of eight weeks. The practical utility of the sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of Cu2+ with EDTA. The proposed membrane electrode was used for the direct determining of Cu2+ content in black and red pepper, and in waste water samples.
A New Approach for Thermodynamic Study on the Binding of Human Serum Albumin with Cerium Chloride
G. Rezaei Behbehani,A. Divsalar,A. A. Saboury,F. Faridbod,M. R. Ganjali 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.6
Thermodynamics of the interaction between Cerium (III) chloride, Ce3+, with Human Serum Albumin, HSA, was investigated at pH 7.0 and 27 oC in phosphate buffer by isothermal titration calorimetry. Our recently solvation model was used to reproduce the enthalpies of HSA interaction by Ce3+. The solvation parameters recovered from our new model, attributed to the structural change of HSA and its biological activity. The interaction of HSA withCe3+ showed a set of two binding sites with negative cooperativity. Ce3+ interacts with multiple sites on HSA naffecting its biochemical and biophysical properties
Mohammad Reza Ganjali*,Parviz Norouzi,Nasrin Yousefian,Farnoush Faridbod,Mehdi Adib 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.10
A La (III) ion-selective membrane sensor has been fabricated from poly vinyl chloride (PVC) matrix membrane, containing 3-hydroxy-N'-(pyridin-2-ylmethylene)-2-naphthohydrazide (HPMN) as a neutral carrier, potassium tetrakis (p-chlorophenyl) borate (KTpClPB) as an anionic excluder and ortho-nitrophenyloctyl ether (NPOE) as a plasticizing solvent mediator. The effects of membrane composition and pH as well as the influence of the anionic additive on the response properties were investigated. The sensor with 30% PVC, 62% solvent mediator, 6% ionophore and 2% anionic additive, shows the best potentiometric response characteristics. It displays a Nernstian behavior (19.2 mV per decade) across the range of 1.0 ´ 10-2 - 1.0 ´ 10-7 M. The detection limit of the electrode is 7.0 ´ 10-8 M (~10 ng/mL) and the response time is 15 s from 1.0 ´ 10-2 up to 1.0 ´ 10-4 M and 30 s in the range of 1.0 ´ 10-5-1.0 ´ 10-7 M. The sensor can be used in the pH values of 3.0-9.0 for about seven weeks. The membrane sensor was used as an indicator electrode in the potentiometric titration of lanthanum ions with EDTA. It was successfully applied to the lanthanum determination in some mouth wash preparations.
A New Approach for Thermodynamic Study on the Binding of Human Serum Albumin with Cerium Chloride
Rezaei Behbehani, G.,Divsalar, A.,Saboury, A.A.,Faridbod, F.,Ganjali, M.R. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.6
Thermodynamics of the interaction between Cerium (III) chloride, $Ce^{3+}$, with Human Serum Albumin, HSA, was investigated at pH 7.0 and $27\;{^{\circ}C}$ in phosphate buffer by isothermal titration calorimetry. Our recently solvation model was used to reproduce the enthalpies of HSA interaction by $Ce^{3+}$. The solvation parameters recovered from our new model, attributed to the structural change of HSA and its biological activity. The interaction of HSA with $Ce^{3+}$ showed a set of two binding sites with negative cooperativity. $Ce^{3+}$ interacts with multiple sites on HSA affecting its biochemical and biophysical properties.