ali yeganeh faal | Payame Noor University (original) (raw)
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Papers by ali yeganeh faal
Chemical Papers, 2009
A simple, sensitive and selective spectrophotometric method for simultaneous determination of tre... more A simple, sensitive and selective spectrophotometric method for simultaneous determination of tretinoin and minoxidil using partial least square (PLS) calibration and H-point standard addition method (HPSAM) is described. The results of the H-point standard addition method show that minoxidil and tretinoin can be determined simultaneously with the concentration ratio of tretinoin to minoxidil varying from 2: 1 to 1: 33 in mixed samples. A partial least squares multivariate calibration method for the analysis of binary mixtures of tretinoin and minoxidil was also developed. The total relative standard error for applying the PLS method to eleven synthetic samples in the concentration range of 0–10 μg mL−1 tretinoin and 0–32 μg mL−1 minoxidil was 2.59 %. Both proposed methods (PLS and HPSAM) were also successfully applied in the determination of tretinoin and minoxidil in several synthetic pharmaceutical solutions.
Talanta, 2002
A sulfate ion-selective PVC membrane sensor based on 4-(4-bromophenyl)-2,6-diphenylpyrilium perch... more A sulfate ion-selective PVC membrane sensor based on 4-(4-bromophenyl)-2,6-diphenylpyrilium perchlorate (BDPP) as a novel sensing material is successfully developed. The electrode shows a good selectivity for sulfate ion with respect to common organic and inorganic anions. The sensor exhibits a good linear response with slope of −28.990.5 mV per decade over the concentration range of 1.0 × 10 − 6 -1.0×10 − 2 M, and a detection limit of 8.0 × 10 − 7 M of SO 4 2 − ions. The electrode response is independent of pH in the range of 4.0-9.0. The proposed sensor was applied as an indicator electrode in potentiometric titration of sulfate and barium ions, and to the determination of zinc in zinc sulfate tablets.
Colloids and Surfaces B-biointerfaces, 2003
The influence of sodium n-dodecyl sulfate (SDS) on hemoglobin reduction has been studied in the p... more The influence of sodium n-dodecyl sulfate (SDS) on hemoglobin reduction has been studied in the presence of 100 mM phosphate buffer (pH 7.0) using spectrophotometry, cyclic voltammetry and chemiluminescence (CL) methods. Spectroscopic studies have revealed that the SDS concentration up to 1 mM reduces the methemoglobin (metHb) to its deoxy form. Such a redox reaction is believed to occur by
![Research paper thumbnail of A study of chemiluminescence from reaction of bis(2,4,6-trichlorophenyl)oxalate, hydrogen peroxide and an optical brightener 5-(3-anilino-5-chloroanilino)-2-{( E)-2-[4-(3-anilino-5-chloroanilino)-2-sulfophenyl]-1-ethenyl}-1-benzenesulfonic acid](https://attachments.academia-assets.com/48609898/thumbnails/1.jpg)
](Dyes and Pigments, 2007
The chemiluminescence (CL) arising from reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with... more The chemiluminescence (CL) arising from reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with hydrogen peroxide in the presence of a diethyl-2-(cyclohexylamino)-5-[(E)-2-phenyl-1-ethenyl]-3,4-furandicarboxylate as a novel fluorescer (Flu) has been studied. The relationship between the chemiluminescence intensity and concentrations of TCPO, sodium salicylate, hydrogen peroxide and fluorescer is reported. The chemiluminescence parameters including intensity at maximum CL, time at maximum intensity, total light yield, theoretical maximum level of intensity and pseudo-first-order rate constants for the rise and fall of the CL burst (k r and k f ) were evaluated from computer fitting of the resulting intensity-time plots. The activation parameters E a , ΔH ‡ , ΔS ‡ and ΔG ‡ for the rise and fall steps were evaluated from the temperature dependence of k r and k f values.
Spectrochimica Acta Part A-molecular and Biomolecular Spectroscopy, 2007
The chemiluminescence arising from the reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with ... more The chemiluminescence arising from the reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with hydrogen peroxide in the presence of brightener 4,4'-bis{[4,6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl]amino}stilbene-2,2'-disulfonic acid-disodium salt (Triazinyl) has been studied. The influence of concentration of TCPO, hydrogen peroxide, Triazinyl, base catalysts and temperature on the resulting chemiluminescence was investigated. The kinetic parameters for the peroxyoxalate-chemiluminescence (PO-CL) of Triazinyl were evaluated from computer fitting of the resulting intensity-time plots. The activation energies, E(a), were evaluated from temperature dependence of the corresponding rise and fall rate constants.
In this work, acidity constants protonated form of 4.4'-bis astilbene-2,2'-disulfonic-disodium sa... more In this work, acidity constants protonated form of 4.4'-bis astilbene-2,2'-disulfonic-disodium salts (TRIAZ) have been determined spectrophotometrically and spectrofluorimetrically at 25 • C and ionic strength of 0.1M KNO 3 . A program based on MCR-ALS applied for determination of acidity constants. The results show that the peak values of dye are influenced by the presence of anionic, cationic, and nonionic surfactants. The effects of sodium dodecyl sulfate (SDS), Triton X-100 (TX-100) and cetyl trimethyl ammonium bromide (CTAB) as a surface-active agent on the acidic and basic forms, and the spectral properties of dye were studied. Also, we determined the critical micelle concentration (CMC) for these surfactants by spectrophotometric and spectrofluorimetric triazine dye probes. In addition, by using of evolving factor analysis (EFA) and multivariate curve resolution alternative least squares (MCR-ALS) methods, acidity constants were acquired.
Ultrasonic technology and response surface methodology (RSM) wereused for optimization of extract... more Ultrasonic technology and response surface methodology (RSM) wereused for optimization of extraction of condensed tannins from the leaf, acron, gland and gall of oak. Three independent variables such as solvent percentage (%), temperature (°C) and time (min) were studied. Effect of methanol concentration was found to be significant on all responses. Optimal ultrasonicassisted extraction (UAE) conditions were identified as 74-82% methanol, 60°C and45 min.The experimental values agreed with those predicted by RSM models, thus indicating suitability of the models employed and the success of RSM in optimizing the extraction conditions. Condensed tannins can be used as wood adhesives.
The chemiluminescence arising from the reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with ... more The chemiluminescence arising from the reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with hydrogen peroxide in the presence of fluorescent brighteners 4,4'-Bis{[4-anilino-6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2yl]amino} stilbene-2,2'-disulfonic acid-disodium salts (Triaz I), 4,4'-Bis{[4-6-anilino -1,3,5-triazin-2yl]amino}stilbene-2,2'-disulfonic acid-disodium salts (Triaz II) has been studied. The influence of concentration of Triazinyl, TCPO, hydrogen peroxide, catalysts concentration, catalyst type and temperature on the chemiluminescence was investigated. The kinetic parameters for the peroxyoxalate-chemiluminescence of Triazinyl were appraise from computer fitting of the resulting intensity-time plots. The activation parameters such as E a and G, were evaluated from temperature dependence of the corresponding fall rate constants.
Structure-toxicity models exist at the intersection of biology, chemistry and statistics. The con... more Structure-toxicity models exist at the intersection of biology, chemistry and statistics. The connection of these three subjects has permitted the development of structure-activity relationships as an accepted sub-discipline in toxicology. The next decade will see an increased use of (quantitative) structureactivity relationships (QSARs) to predict toxicity for new and existing chemicals. Much of the focus will be on their application to reduce or replace animal use in toxicological testing for the regulation of existing chemicals (e.g. in the REACH legislation) 1 . The official birth date of QSAR is considered to be 1962, when Hansch et al. 2 published a paper which showed a correlation between biological activity and octanol-water partition coefficient. Quantitative structure-activity relationship models have another ability which is obtaining a deeper knowledge about the mechanism of biological activity. Quantitative structure-activity relationships represent predictive models derived from application of statistical tools correlating biological activity (including therapeutic and toxic) of chemicals (drugs/toxicants/environmental pollutants) with descriptors representative of molecular structure and/or property. The
This work is first report showed that supported TiO 2 NPs on alumina could act catalytic activity... more This work is first report showed that supported TiO 2 NPs on alumina could act catalytic activity on peroxyoxalate chemiluminescence system. In this work the catalytic effect of supported Titanium dioxide nanoparticles (TiO 2 NPs) on the trichloroperoxy oxalate -hydrogen peroxide (PO-CL) reaction is investigated. Supported TiO 2 nanoparticles exhibited the better CL catalysis activity than SnO and Carbon nanotubes. Supported TiO 2 nanoparticles catalyze the chemiluminescence reaction between TCPO (bis-(2,4,6-trichlorophenyl) oxalate) and H 2 O 2 and produce a strong CL signal in the presence of triazinyl dye derivative as fluorophore. The CL signal intensity was linear with the hydrogen peroxide concentration in the range of 5 to 1000 nmol ml -1 with a detection limit of 1.2 nmol ml -1 and regression coefficient was 0.992 (n=4). The relative standard deviations for measurement of 300 and 500 nmol ml -1 hydrogen peroxide were 2.2 and 3.4%, respectively(n=4). Hydrogen peroxide concentration in river water was 8.7 nmol ml -1 with RSD=5.4%(n=3).
Chemical Papers, 2009
A simple, sensitive and selective spectrophotometric method for simultaneous determination of tre... more A simple, sensitive and selective spectrophotometric method for simultaneous determination of tretinoin and minoxidil using partial least square (PLS) calibration and H-point standard addition method (HPSAM) is described. The results of the H-point standard addition method show that minoxidil and tretinoin can be determined simultaneously with the concentration ratio of tretinoin to minoxidil varying from 2: 1 to 1: 33 in mixed samples. A partial least squares multivariate calibration method for the analysis of binary mixtures of tretinoin and minoxidil was also developed. The total relative standard error for applying the PLS method to eleven synthetic samples in the concentration range of 0–10 μg mL−1 tretinoin and 0–32 μg mL−1 minoxidil was 2.59 %. Both proposed methods (PLS and HPSAM) were also successfully applied in the determination of tretinoin and minoxidil in several synthetic pharmaceutical solutions.
Talanta, 2002
A sulfate ion-selective PVC membrane sensor based on 4-(4-bromophenyl)-2,6-diphenylpyrilium perch... more A sulfate ion-selective PVC membrane sensor based on 4-(4-bromophenyl)-2,6-diphenylpyrilium perchlorate (BDPP) as a novel sensing material is successfully developed. The electrode shows a good selectivity for sulfate ion with respect to common organic and inorganic anions. The sensor exhibits a good linear response with slope of −28.990.5 mV per decade over the concentration range of 1.0 × 10 − 6 -1.0×10 − 2 M, and a detection limit of 8.0 × 10 − 7 M of SO 4 2 − ions. The electrode response is independent of pH in the range of 4.0-9.0. The proposed sensor was applied as an indicator electrode in potentiometric titration of sulfate and barium ions, and to the determination of zinc in zinc sulfate tablets.
Colloids and Surfaces B-biointerfaces, 2003
The influence of sodium n-dodecyl sulfate (SDS) on hemoglobin reduction has been studied in the p... more The influence of sodium n-dodecyl sulfate (SDS) on hemoglobin reduction has been studied in the presence of 100 mM phosphate buffer (pH 7.0) using spectrophotometry, cyclic voltammetry and chemiluminescence (CL) methods. Spectroscopic studies have revealed that the SDS concentration up to 1 mM reduces the methemoglobin (metHb) to its deoxy form. Such a redox reaction is believed to occur by
Dyes and Pigments, 2007
The chemiluminescence (CL) arising from reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with... more The chemiluminescence (CL) arising from reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with hydrogen peroxide in the presence of a diethyl-2-(cyclohexylamino)-5-[(E)-2-phenyl-1-ethenyl]-3,4-furandicarboxylate as a novel fluorescer (Flu) has been studied. The relationship between the chemiluminescence intensity and concentrations of TCPO, sodium salicylate, hydrogen peroxide and fluorescer is reported. The chemiluminescence parameters including intensity at maximum CL, time at maximum intensity, total light yield, theoretical maximum level of intensity and pseudo-first-order rate constants for the rise and fall of the CL burst (k r and k f ) were evaluated from computer fitting of the resulting intensity-time plots. The activation parameters E a , ΔH ‡ , ΔS ‡ and ΔG ‡ for the rise and fall steps were evaluated from the temperature dependence of k r and k f values.
Spectrochimica Acta Part A-molecular and Biomolecular Spectroscopy, 2007
The chemiluminescence arising from the reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with ... more The chemiluminescence arising from the reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with hydrogen peroxide in the presence of brightener 4,4'-bis{[4,6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl]amino}stilbene-2,2'-disulfonic acid-disodium salt (Triazinyl) has been studied. The influence of concentration of TCPO, hydrogen peroxide, Triazinyl, base catalysts and temperature on the resulting chemiluminescence was investigated. The kinetic parameters for the peroxyoxalate-chemiluminescence (PO-CL) of Triazinyl were evaluated from computer fitting of the resulting intensity-time plots. The activation energies, E(a), were evaluated from temperature dependence of the corresponding rise and fall rate constants.
In this work, acidity constants protonated form of 4.4'-bis astilbene-2,2'-disulfonic-disodium sa... more In this work, acidity constants protonated form of 4.4'-bis astilbene-2,2'-disulfonic-disodium salts (TRIAZ) have been determined spectrophotometrically and spectrofluorimetrically at 25 • C and ionic strength of 0.1M KNO 3 . A program based on MCR-ALS applied for determination of acidity constants. The results show that the peak values of dye are influenced by the presence of anionic, cationic, and nonionic surfactants. The effects of sodium dodecyl sulfate (SDS), Triton X-100 (TX-100) and cetyl trimethyl ammonium bromide (CTAB) as a surface-active agent on the acidic and basic forms, and the spectral properties of dye were studied. Also, we determined the critical micelle concentration (CMC) for these surfactants by spectrophotometric and spectrofluorimetric triazine dye probes. In addition, by using of evolving factor analysis (EFA) and multivariate curve resolution alternative least squares (MCR-ALS) methods, acidity constants were acquired.
Ultrasonic technology and response surface methodology (RSM) wereused for optimization of extract... more Ultrasonic technology and response surface methodology (RSM) wereused for optimization of extraction of condensed tannins from the leaf, acron, gland and gall of oak. Three independent variables such as solvent percentage (%), temperature (°C) and time (min) were studied. Effect of methanol concentration was found to be significant on all responses. Optimal ultrasonicassisted extraction (UAE) conditions were identified as 74-82% methanol, 60°C and45 min.The experimental values agreed with those predicted by RSM models, thus indicating suitability of the models employed and the success of RSM in optimizing the extraction conditions. Condensed tannins can be used as wood adhesives.
The chemiluminescence arising from the reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with ... more The chemiluminescence arising from the reaction of bis(2,4,6-trichlorophenyl)oxalate (TCPO) with hydrogen peroxide in the presence of fluorescent brighteners 4,4'-Bis{[4-anilino-6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2yl]amino} stilbene-2,2'-disulfonic acid-disodium salts (Triaz I), 4,4'-Bis{[4-6-anilino -1,3,5-triazin-2yl]amino}stilbene-2,2'-disulfonic acid-disodium salts (Triaz II) has been studied. The influence of concentration of Triazinyl, TCPO, hydrogen peroxide, catalysts concentration, catalyst type and temperature on the chemiluminescence was investigated. The kinetic parameters for the peroxyoxalate-chemiluminescence of Triazinyl were appraise from computer fitting of the resulting intensity-time plots. The activation parameters such as E a and G, were evaluated from temperature dependence of the corresponding fall rate constants.
Structure-toxicity models exist at the intersection of biology, chemistry and statistics. The con... more Structure-toxicity models exist at the intersection of biology, chemistry and statistics. The connection of these three subjects has permitted the development of structure-activity relationships as an accepted sub-discipline in toxicology. The next decade will see an increased use of (quantitative) structureactivity relationships (QSARs) to predict toxicity for new and existing chemicals. Much of the focus will be on their application to reduce or replace animal use in toxicological testing for the regulation of existing chemicals (e.g. in the REACH legislation) 1 . The official birth date of QSAR is considered to be 1962, when Hansch et al. 2 published a paper which showed a correlation between biological activity and octanol-water partition coefficient. Quantitative structure-activity relationship models have another ability which is obtaining a deeper knowledge about the mechanism of biological activity. Quantitative structure-activity relationships represent predictive models derived from application of statistical tools correlating biological activity (including therapeutic and toxic) of chemicals (drugs/toxicants/environmental pollutants) with descriptors representative of molecular structure and/or property. The
This work is first report showed that supported TiO 2 NPs on alumina could act catalytic activity... more This work is first report showed that supported TiO 2 NPs on alumina could act catalytic activity on peroxyoxalate chemiluminescence system. In this work the catalytic effect of supported Titanium dioxide nanoparticles (TiO 2 NPs) on the trichloroperoxy oxalate -hydrogen peroxide (PO-CL) reaction is investigated. Supported TiO 2 nanoparticles exhibited the better CL catalysis activity than SnO and Carbon nanotubes. Supported TiO 2 nanoparticles catalyze the chemiluminescence reaction between TCPO (bis-(2,4,6-trichlorophenyl) oxalate) and H 2 O 2 and produce a strong CL signal in the presence of triazinyl dye derivative as fluorophore. The CL signal intensity was linear with the hydrogen peroxide concentration in the range of 5 to 1000 nmol ml -1 with a detection limit of 1.2 nmol ml -1 and regression coefficient was 0.992 (n=4). The relative standard deviations for measurement of 300 and 500 nmol ml -1 hydrogen peroxide were 2.2 and 3.4%, respectively(n=4). Hydrogen peroxide concentration in river water was 8.7 nmol ml -1 with RSD=5.4%(n=3).