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Ghoreishi, Sayed Mehdi,Naeimi, Hossein,Navid, Mohammad Davodi Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.4
The interaction between ionic surfactants and different nonionic molecules and polymers are studied using ion surfactant selective electrode. From the experimental data, critical concentrations of the interaction and binding process are evaluated. The interaction between hexadecyltrimethylammonium bromide (HTAB) with polyethylene glycol (PEG) in three molecular weights (1000, 10000 and 100000) and also schiff-bases, 2-[2-carboxyphenyl nitrilomethylidyne]-phenol (ortho CNP), 2-[3-carboxyphenyl nitrilomethylidyne]-phenol (meta CNP)and 2-[4-carboxyphenyl nitrilomethylidyne]-phenol (para CNP) with the potentiometric method were investigated using HTAB membrane selective electrode. In the case of PEG with increasing molecular weights more interaction to HTAB occurs. The electromotive force (EMF) data also showed that interaction between para CNP with HTAB is more than the other schiff-bases. It seems this case related to less space interference of COOH group for that compound. The onset of binding ($T_1$) of course is the same for three schiffbase molecules.
Sayed Mehdi Ghoreishi,Hossein Naeimi,Mohammad Davodi Navid 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.4
The interaction between ionic surfactants and different nonionic molecules and polymers are studied using ion surfactant selective electrode. From the experimental data, critical concentrations of the interaction and binding process are evaluated. The interaction between hexadecyltrimethylammonium bromide (HTAB) with polyethylene glycol (PEG) in three molecular weights (1000, 10000 and 100000) and also schiff-bases, 2-[2-carboxyphenyl nitrilomethylidyne]-phenol (ortho CNP), 2-[3-carboxyphenyl nitrilomethylidyne]-phenol (meta CNP)and 2-[4-carboxyphenyl nitrilomethylidyne]-phenol (para CNP) with the potentiometric method were investigated using HTAB membrane selective electrode. In the case of PEG with increasing molecular weights more interaction to HTAB occurs. The electromotive force (EMF) data also showed that interaction between para CNP with HTAB is more than the other schiff-bases. It seems this case related to less space interference of COOH group for that compound. The onset of binding (T1) of course is the same for three schiff-base molecules.
Farzaneh Haghighian,Sayed Mehdi Ghoreishi,Abdolmohammad Attaran,Fahimeh Zeraatkar Kashani,Asma Khoobi 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.3
Procaine belongs to a type of medicine that excessive dosage creates cardiac arrest and also several allergenic reactions. Thus, continuous monitoring of the drug and its metabolite is necessary for sustainable health management during treatment. The innovative aspect of nanostructure materials has great importance in the advancement of research on modified sensors. In the present study, the electrocatalytic performance of multi-walled carbon nanotubes modified carbon paste electrode was investigated for the simultaneous analysis of procaine hydrochloride and p-aminobenzoic acid with high accuracy and sensitivity. The nanostructured sensor is characterized by microscopic and electrochemical techniques, such as scanning electron microscopy and electrochemical impedance spectroscopy using [Fe(CN)6]3−/4− as the redox probes. The modified sensor shows an improved voltammetric peak current than the unmodified carbon paste electrode. The electrochemical behavior of the modified sensor was studied by cyclic voltammetry and differential pulse voltammetry. The sensor kinetic parameters containing electron transfer rate constant (ks=0.47 s−1) and charge transfer coefficient (α=0.23) were calculated using cyclic voltammetry. The differential pulse voltammetry technique was also investigated in terms of linearity, lower limit of detection, lower limit of quantitation, accuracy and precision, which indicate acceptable results. Under optimized experimental conditions, the concentration linear range for procaine and PABA was obtained in the range of 2.4 to 100.0 µM. The limit of detection values (S/N=3) were calculated to be 62.0 and 49.0 nM for detection of procaine and p-aminobenzoic acid, respectively. Also, the effects of interfering materials, repeatability and stability of the modified sensor were studied. Finally, the proposed sensor was applied for simultaneous and sensitive detection of p-aminobenzoic acid and procaine in real media such as plasma and pharmaceutical products with satisfactory results.