Turgay Tunç - Academia.edu (original) (raw)

Papers by Turgay Tunç

Research paper thumbnail of Synthesis of new antimony(III) complexes for treatment of leishmaniasis

Bu çalışmada toplam 24 tane kapalı formülü SbLnX3 olan ( n: 1 veya 2, X: Cl veya Br, L: 2-aminopi... more Bu çalışmada toplam 24 tane kapalı formülü SbLnX3 olan ( n: 1 veya 2, X: Cl veya Br, L: 2-aminopiridin (1), 2-amino-5-metil piridin (2), 2-amino pirimidin (3), 2-amino-4,6- dimetoksi pirimidin (4), 2-benzil-2-tiyopseudoüre (5), 2-guanidobenzimidazol (6), 2- amino-4,6-dimetoksi-5-tiyol pirimidin (7), 2-amino-5-(1H-tetrazol-5-iltiyo)-4,6-dimetoksi pirimidin (8), 5-5'-disülfanidil-bis(2-amino-4,6 dimetoksipirimidin) (9), N-2-pirimidin-2- piperidinkarboksamit (10), N-2-pirimidin-2-pirolidinkarboksamit (11), N-2-5-(1H-tetrazol- 5-iltiyo)-4,6-dimetoksipirimidin-2-pirolidinkarboksamit (12), 5-kloro-N-(2-pirimidin) tiyofen-2-karboksamit (13), N-2-benzotiyoazol-2-pirolidinkarboksamit (14), N,N-(1,2- fenil)dipirolin-2-karboksamit) (15) antimon(III) kompleksi sentezlenmiş ve yapıları spektroskopik (LC-MS, 1H-NMR, 13C-NMR, FTIR ) yöntemler, elementel analiz ve iletkenlik yöntemi ile aydınlatılmıştır. Ayrıca 9 nolu ligandın yapısı tek kristal X-ışını analizi ile belirlenmiştir. Komplekslerin...

Research paper thumbnail of Çimentolarda çözünebilen Cr(VI) giderimi

Pamukkale Üniversitesi Fen Bilimleri Enstitüsü, Aug 1, 2007

Research paper thumbnail of Synthesis of New Schiff Bases and Assessment of Their in vitro Biological Effects on Acetylcholinesterase and Carbonic Anhydrase Isoenzymes Activities

Russian Journal of Organic Chemistry, 2021

Abstract In this study, three new Schiff bases have been synthesized by the reactions of commerci... more Abstract In this study, three new Schiff bases have been synthesized by the reactions of commercially available phenylglycinol, phenylalaninol, and leuicinol with 4-{[2-(4-formylphenoxy)ethyl](methyl)amin}benzaldehyde and characterized by 1 H and 13 C NMR, FTIR, and UV-Vis spectroscopy and LCMS/MS. In vitro effects of synthesized new Schiff bases on human erythrocyte carbonic anhydrase I (hCA I) and II (hCA II) isoenzymes and acetylcholinesterase (AChE) activity were investigated. Schiff base synthesized from phenylglycinol showed no meaningful effect on hCAI and hCAII. Schiff bases synthesized from phenylalaninol and leuicinol exhibited a strong activation effect on hCAI and hCAII. On the other hand, all of the synthesized three Schiff bases exhibited a strong inhibitory effect on AChE activity.

Research paper thumbnail of In vitro anti-leishmanial activities and structure-activity relationship analysis of new antimony(III) complexes

New fourteen antimony(III) complexes of general formula [SbL n Cl 3 ] (where n= 1 or 2, L =2-amin... more New fourteen antimony(III) complexes of general formula [SbL n Cl 3 ] (where n= 1 or 2, L =2-aminopyridine, 5-methyl-2-aminopyridine, 2-aminopyrimidine, 4,6-dimethoxy-2-aminopyrimidine, 2-benzyl-2-thiopseudeourea,2-guanidinobenzimidazole, 2-amino-5-thiol-4,6-dimethoxypyrimidine, 2-amino-5-(1H-tetrazol-5-ylthio)-4,6-dimethoxypyrimidine, N-2-pyrimidine, 2-piperidinecarboxamide, N-2-pyrimidine, 2-pyrrolidinecarboxamide, 2-amino-5-(1H-tetrazol-5-iltiyo)-4,6-dimethoxypyrimidine-2-pyrrolidinecarboxamide and N-2-pyrimidine, 5-chloro-2-thiophenecarboxamide , N-2-benzothiazol-2-pyrrolidinecarboxaamide, N,N-(1,2-phenyl)dipyrrolidine-2-carboxamide) have been synthesized and their anti-leishmanial activity have been assessed in vitro against Leishmania tropica promastigotes. The best complex, Sb(2-guanidinobenzimidazole)Cl 3 is demostrated 3.16% growth inhibition at a concentration of 31.25 μg/mL. In general, antimony(III) complexes containing pyrimidine ligands has showed higher anti-leishmani...

Research paper thumbnail of Studies of Glutathione Reductase Inhibitors Activity of Copper(II) Complexes

Research paper thumbnail of Removal of Soluble Cr (VI) in Cements by Ferrous Sulphate monohydrate, Solid Lignin and Other Materials

Ceramics Silikaty

Various reducing agents such as ferrous sulphate heptahydrate (HH) and monohydrate (MH), solid li... more Various reducing agents such as ferrous sulphate heptahydrate (HH) and monohydrate (MH), solid lignin (SL), Na 2 S 2 O 4 , NaHSO 3 , SnCl 2 •2H 2 O, N 2 H 4 •H 2 O and FeS are used to reduce Cr(VI) contents of three types of cements under 2 mg/L, as it is requested by European Parliament Standards. Optimum conversion temperature of HH to MH was found as 130°C, for 20 min., by thermal analysis. Minimum amounts of various agents to be used as additives in cements to reduce Cr(VI) contents under the standard value were determined. Minimum reducing agent amounts of SL, MH and their mixture of 1:3 mole fractions were found as 0.

Research paper thumbnail of Synthesis of benzimidazole derivatives containing amide bond and biological evaluation as acetylcholinesterase, carbonic anhydrase I and II inhibitors

Journal of Molecular Structure

Research paper thumbnail of Synthesis and Antimicrobial Study of New Benzimidazole Schiff Bases Bearing P-Toluene Sulfonamide Moiety

Journal of the Chilean Chemical Society

Three new Schiff bases bearing benzimidazole and p-toluen sulfonamide moiety were synthesized. Th... more Three new Schiff bases bearing benzimidazole and p-toluen sulfonamide moiety were synthesized. Their structures were characterized by elemental analysis, FTIR, NMR and LCMS methods. The antimicrobial properties of the compounds were also evaluated. All compounds exhibit higher antimicrobial activity against all bacteria, Schiff bases (4a-4c) shows more activity than the parent aldehyde (3). 4c displays higher antibacterial activity against P. aeruginosa compare to reference drug Sulfioxazole. The compounds were found more potent against Gram-negative than Gram positive bacteria. One more free phenyl group increase the activity in 4c, but one more phenyl ring in 4b does not.In vitro antifungal activity of the compounds was also tested on fungi C. albicans C. tropicalis and C. krusei. However, our compounds exhibit no antifungal activity against three fungi.

Research paper thumbnail of Synthesis and Antibacterial Activity of New Chiral Aminoalcohol and Benzimidazole Hybrids

Research paper thumbnail of Bakır(II) Komplekslerinin Glutatyon Redüktaz İnhibitor Çalışması

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

Research paper thumbnail of DNA binding and cleavage activity of three new copper (II) complexes of chiral N-salicyl-β-amino alcohol Schiff bases

Journal of the Mexican Chemical Society

Three new copper(II) complexes (1-3) with general formula [Cu(HL)CH3COO] of N-salicyl-βamino alco... more Three new copper(II) complexes (1-3) with general formula [Cu(HL)CH3COO] of N-salicyl-βamino alcohol Schiff bases containing, (S)-(+)-phenyl glycinol, (1S, 2R)-2-amino-1, 2-diphenylethanol and 1, 1, 3-triphenyl-(R)-(+)-2-amino propanol, were synthesized. Their structures were characterized by FTIR, LCMS, magnetic moment, molar conductance and elemental analysis data. DFT calculations proposed distorted square planar geometries for the complexes. The calculated IR spectra are in good agreement with the experimental IR spectra, confirming the proposed structures. Their interactions with calf thymus DNA were investigated and their binding constants Kb were found. Gel electrophoresis reveals that all complexes display significant nuclease activity against supercoiled pentry/d-topo plasmid DNA.

Research paper thumbnail of Evaluation of new Cu(II) complexes as a novel class of inhibitors against plant carbonic anhydrase, glutathione reductase, and photosynthetic activity in photosystem II

Photosynthesis research, Jan 11, 2017

Increasing inefficiency of production of important agricultural plants raises one of the biggest ... more Increasing inefficiency of production of important agricultural plants raises one of the biggest problems in the modern world. Herbicide application is still the best method of weed management. Traditional herbicides blocking only one of the plant metabolic pathways is ineffective due to the rapid growth of herbicide-resistant weeds. The synthesis of novel compounds effectively suppressing several metabolic processes, and therefore achieving the synergism effect would serve as the alternative approach to weed problem. For this reason, recently, we synthesized a series of nine novel Cu(II) complexes and four ligands, characterized them with different analyses techniques, and carried out their primary evaluation as inhibitors of photosynthetic electron transfer in spinach thylakoids (design, synthesis, and evaluation of a series of Cu(II) based metal-organic complexes as possible inhibitors of photosynthesis, J Photochem Photobiol B, submitted). Here, we evaluated in vitro inhibitory ...

Research paper thumbnail of Characterization of nineteen antimony(III) complexes as potent inhibitors of photosystem II, carbonic anhydrase, and glutathione reductase

Photosynthesis Research, 2016

Nineteen antimony(III) complexes were obtained and examined as possible herbicides. Six of these ... more Nineteen antimony(III) complexes were obtained and examined as possible herbicides. Six of these were synthesized for the first time, and their structures were identified using elemental analyses, (1)H-NMR, (13)C-NMR, FTIR, LCMS, magnetic susceptibility, and conductivity measurement techniques. For the nineteen examined antimony(III) complexes their most-stable forms were determined by DFT/B3LYP/LanL2DZ calculation method. These compounds were examined for effects on photosynthetic electron transfer and carbonic anhydrase activity of photosystem II, and glutathione reductase from chloroplast as well were investigated. Our results indicated that all antimony(III) complexes inhibited glutathione reductase activity of chloroplast. A number of these also exhibited good inhibitory efficiency of the photosynthetic and carbonic anhydrase activity of Photosystem II.

Research paper thumbnail of Antimony(III) complexes with 2-amino-4,6-dimethoxypyrimidines: Synthesis, characterization and biological evaluation

Journal of Photochemistry and Photobiology B: Biology, 2015

Novel pyrimidine compound bearing disulfide bridge, 5,5&a... more Novel pyrimidine compound bearing disulfide bridge, 5,5'-disulfanediylbis(2-amino-4,6-dimetoxypyrimidine) (3) was synthesized by reduction of 2-amino-4,6-dimethoxy-5-thiocyanatopyrimidine for the first time, and its structure was confirmed by X-ray crystallographic analysis. Novel binuclear antimony(III) compound of (3), {Sb[5,5'-disulfanediylbis(2-amino-4,6-dimetoxypyrimidine)]Cl3}2 (4) and mononuclear antimony(III) compounds, SbL2Cl3, [L: 2-amino-5-thiol-4,6-dimethoxy pyrimidine (2) and 2-amino-5-(1H-tetrazol-5-ylthio)-4,6-dimethoxypyrimidine (6)] were synthesized and characterized with the help of elemental analysis, molecular conductivity, FT-IR, (1)H-NMR and LC-MS techniques. The geometrical structures optimized by a DFT/B3LYP/LANL2DZ method of the compounds, indicated that monomeric compounds have square pyramidal shape. Both antileishmanial activity against Leishmania tropica promastigote and glutathione reductase inhibitory activity were determined in vitro. The results showed that (3) has the best biological activity.

Research paper thumbnail of A new method for screening glutathione reductase inhibitors using square wave voltammetry

Anal. Methods, 2015

A novel square wave voltammetric method was developed for the detection of GR activity by measure... more A novel square wave voltammetric method was developed for the detection of GR activity by measurement of diffusion current of GSH.

Research paper thumbnail of DNA cleavage, antimicrobial studies and a DFT-based QSAR study of new antimony(III) complexes as glutathione reductase inhibitor

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015

New antimony(III) complexes, [Sb(2-aminopyridine)2Cl3] (1a), [Sb(2-aminopyridine)2Br3] (1b), [Sb(... more New antimony(III) complexes, [Sb(2-aminopyridine)2Cl3] (1a), [Sb(2-aminopyridine)2Br3] (1b), [Sb(5-methyl-2-aminopyridine)2Cl3] (2a), [Sb(5-methyl-2-aminopyridine)2Br3] (2b), [Sb(2-aminopyrimidine)2Cl3] (3a), [Sb(2-aminopyrimidine)2Br3] (3b), [Sb(4,6-dimethoxy-2-aminopyrimidine)2Cl3] (4a), [Sb(4,6-dimethoxy-2-aminopyrimidine)2Br3] (4b), [Sb(2-amino-1,3,5-triazine)2Cl3] (5a), [Sb(2-amino-1,3,5-triazine)2Br3] (5b), [Sb(2-guanidinobenzimidazole) Cl3] (6a), [Sb(2-guanidinobenzimidazole)Br3] (6b) [Sb(2- benzyl-2-thiopseudeourea)2Cl3] (7a) and [Sb(2- benzyl-2-thiopseudeourea)2Br3] (7b) were synthesized. Their structures were characterized by elemental analysis, molecular conductivity, FT-IR, (1)H NMR, LC-MS techniques. Glutathione reductase inhibitor activity, antimicrobial activity and DNA cleavage studies of the complexes were determined. The geometrical structures of the complexes were optimized by DFT/B3LYP method with LANL2DZ as basis set. Calculation results indicated that the equilibrium geometries of all complexes have square pyramidal shape. About 350 molecular descriptors (constitutional, topological, geometrical, electrostatic and quantum chemical parameters) of the complexes were calculated by DFT/B3LYP/LANL2DZ method with CODESSA software. Calculated molecular parameters were correlated to glutathione reductase inhibitory activity values (pIC50) of all complexes by Best Multi-Linear Regression (BMLR) method. Obtained two-parameter QSAR equation shows that increase in "maximum partial charge for a H atom" and decrease in HOMO-LUMO gap would be favorable for the glutathione reductase inhibitory activity.

Research paper thumbnail of Development of a new enrichment method for simultaneous determination of copper and zinc in water samples

Environmental Toxicology and Chemistry, 2011

In the present study, an enrichment and separation method for the simultaneous determination of t... more In the present study, an enrichment and separation method for the simultaneous determination of trace amounts of Cu and Zn in water samples was developed. Copper and Zn ions found in water matrix in trace amounts were preconcentrated on Duolite XAD 761 resin without using any chelating agent and determined by flame atomic absorption spectrometer (FAAS). Experimental parameters such as pH, concentration of metal ions, amount of resin, and sample volume for quantitative determination of Cu and Zn ions were optimized. The elution process was performed by using 5 ml of 2 mol/L HCl solution. The preconcentration factors for Cu and Zn were found to be 160 and 200, respectively. Under optimized conditions, limit of detection for Cu and Zn were 2.46 and 3.54 µg/L, respectively. The Langmuir adsorption model was applied to describe the equilibrium isotherm. The Langmuir monolayer adsorption capacity of resin was estimated as 31.2 and 17.7 mg/g for Cu and Zn, respectively. The proposed method was successfully applied to determine the Cu and Zn content of various water samples.

Research paper thumbnail of Development of a new enrichment method for simultaneous determination of copper and zinc in water samples

… Toxicology and Chemistry, 2011

In the present study, an enrichment and separation method for the simultaneous determination of t... more In the present study, an enrichment and separation method for the simultaneous determination of trace amounts of Cu and Zn in water samples was developed. Copper and Zn ions found in water matrix in trace amounts were preconcentrated on Duolite XAD 761 resin without using any chelating agent and determined by flame atomic absorption spectrometer (FAAS). Experimental parameters such as pH, concentration of metal ions, amount of resin, and sample volume for quantitative determination of Cu and Zn ions were optimized. The elution process was performed by using 5 ml of 2 mol/L HCl solution. The preconcentration factors for Cu and Zn were found to be 160 and 200, respectively. Under optimized conditions, limit of detection for Cu and Zn were 2.46 and 3.54 µg/L, respectively. The Langmuir adsorption model was applied to describe the equilibrium isotherm. The Langmuir monolayer adsorption capacity of resin was estimated as 31.2 and 17.7 mg/g for Cu and Zn, respectively. The proposed method was successfully applied to determine the Cu and Zn content of various water samples.

Research paper thumbnail of Development of a new enrichment method for simultaneous determination of copper and zinc in water samples

… Toxicology and Chemistry, 2011

In the present study, an enrichment and separation method for the simultaneous determination of t... more In the present study, an enrichment and separation method for the simultaneous determination of trace amounts of Cu and Zn in water samples was developed. Copper and Zn ions found in water matrix in trace amounts were preconcentrated on Duolite XAD 761 resin without using any chelating agent and determined by flame atomic absorption spectrometer (FAAS). Experimental parameters such as pH, concentration of metal ions, amount of resin, and sample volume for quantitative determination of Cu and Zn ions were optimized. The elution process was performed by using 5 ml of 2 mol/L HCl solution. The preconcentration factors for Cu and Zn were found to be 160 and 200, respectively. Under optimized conditions, limit of detection for Cu and Zn were 2.46 and 3.54 µg/L, respectively. The Langmuir adsorption model was applied to describe the equilibrium isotherm. The Langmuir monolayer adsorption capacity of resin was estimated as 31.2 and 17.7 mg/g for Cu and Zn, respectively. The proposed method was successfully applied to determine the Cu and Zn content of various water samples.

Research paper thumbnail of Synthesis of new antimony(III) complexes for treatment of leishmaniasis

Bu çalışmada toplam 24 tane kapalı formülü SbLnX3 olan ( n: 1 veya 2, X: Cl veya Br, L: 2-aminopi... more Bu çalışmada toplam 24 tane kapalı formülü SbLnX3 olan ( n: 1 veya 2, X: Cl veya Br, L: 2-aminopiridin (1), 2-amino-5-metil piridin (2), 2-amino pirimidin (3), 2-amino-4,6- dimetoksi pirimidin (4), 2-benzil-2-tiyopseudoüre (5), 2-guanidobenzimidazol (6), 2- amino-4,6-dimetoksi-5-tiyol pirimidin (7), 2-amino-5-(1H-tetrazol-5-iltiyo)-4,6-dimetoksi pirimidin (8), 5-5'-disülfanidil-bis(2-amino-4,6 dimetoksipirimidin) (9), N-2-pirimidin-2- piperidinkarboksamit (10), N-2-pirimidin-2-pirolidinkarboksamit (11), N-2-5-(1H-tetrazol- 5-iltiyo)-4,6-dimetoksipirimidin-2-pirolidinkarboksamit (12), 5-kloro-N-(2-pirimidin) tiyofen-2-karboksamit (13), N-2-benzotiyoazol-2-pirolidinkarboksamit (14), N,N-(1,2- fenil)dipirolin-2-karboksamit) (15) antimon(III) kompleksi sentezlenmiş ve yapıları spektroskopik (LC-MS, 1H-NMR, 13C-NMR, FTIR ) yöntemler, elementel analiz ve iletkenlik yöntemi ile aydınlatılmıştır. Ayrıca 9 nolu ligandın yapısı tek kristal X-ışını analizi ile belirlenmiştir. Komplekslerin...

Research paper thumbnail of Çimentolarda çözünebilen Cr(VI) giderimi

Pamukkale Üniversitesi Fen Bilimleri Enstitüsü, Aug 1, 2007

Research paper thumbnail of Synthesis of New Schiff Bases and Assessment of Their in vitro Biological Effects on Acetylcholinesterase and Carbonic Anhydrase Isoenzymes Activities

Russian Journal of Organic Chemistry, 2021

Abstract In this study, three new Schiff bases have been synthesized by the reactions of commerci... more Abstract In this study, three new Schiff bases have been synthesized by the reactions of commercially available phenylglycinol, phenylalaninol, and leuicinol with 4-{[2-(4-formylphenoxy)ethyl](methyl)amin}benzaldehyde and characterized by 1 H and 13 C NMR, FTIR, and UV-Vis spectroscopy and LCMS/MS. In vitro effects of synthesized new Schiff bases on human erythrocyte carbonic anhydrase I (hCA I) and II (hCA II) isoenzymes and acetylcholinesterase (AChE) activity were investigated. Schiff base synthesized from phenylglycinol showed no meaningful effect on hCAI and hCAII. Schiff bases synthesized from phenylalaninol and leuicinol exhibited a strong activation effect on hCAI and hCAII. On the other hand, all of the synthesized three Schiff bases exhibited a strong inhibitory effect on AChE activity.

Research paper thumbnail of In vitro anti-leishmanial activities and structure-activity relationship analysis of new antimony(III) complexes

New fourteen antimony(III) complexes of general formula [SbL n Cl 3 ] (where n= 1 or 2, L =2-amin... more New fourteen antimony(III) complexes of general formula [SbL n Cl 3 ] (where n= 1 or 2, L =2-aminopyridine, 5-methyl-2-aminopyridine, 2-aminopyrimidine, 4,6-dimethoxy-2-aminopyrimidine, 2-benzyl-2-thiopseudeourea,2-guanidinobenzimidazole, 2-amino-5-thiol-4,6-dimethoxypyrimidine, 2-amino-5-(1H-tetrazol-5-ylthio)-4,6-dimethoxypyrimidine, N-2-pyrimidine, 2-piperidinecarboxamide, N-2-pyrimidine, 2-pyrrolidinecarboxamide, 2-amino-5-(1H-tetrazol-5-iltiyo)-4,6-dimethoxypyrimidine-2-pyrrolidinecarboxamide and N-2-pyrimidine, 5-chloro-2-thiophenecarboxamide , N-2-benzothiazol-2-pyrrolidinecarboxaamide, N,N-(1,2-phenyl)dipyrrolidine-2-carboxamide) have been synthesized and their anti-leishmanial activity have been assessed in vitro against Leishmania tropica promastigotes. The best complex, Sb(2-guanidinobenzimidazole)Cl 3 is demostrated 3.16% growth inhibition at a concentration of 31.25 μg/mL. In general, antimony(III) complexes containing pyrimidine ligands has showed higher anti-leishmani...

Research paper thumbnail of Studies of Glutathione Reductase Inhibitors Activity of Copper(II) Complexes

Research paper thumbnail of Removal of Soluble Cr (VI) in Cements by Ferrous Sulphate monohydrate, Solid Lignin and Other Materials

Ceramics Silikaty

Various reducing agents such as ferrous sulphate heptahydrate (HH) and monohydrate (MH), solid li... more Various reducing agents such as ferrous sulphate heptahydrate (HH) and monohydrate (MH), solid lignin (SL), Na 2 S 2 O 4 , NaHSO 3 , SnCl 2 •2H 2 O, N 2 H 4 •H 2 O and FeS are used to reduce Cr(VI) contents of three types of cements under 2 mg/L, as it is requested by European Parliament Standards. Optimum conversion temperature of HH to MH was found as 130°C, for 20 min., by thermal analysis. Minimum amounts of various agents to be used as additives in cements to reduce Cr(VI) contents under the standard value were determined. Minimum reducing agent amounts of SL, MH and their mixture of 1:3 mole fractions were found as 0.

Research paper thumbnail of Synthesis of benzimidazole derivatives containing amide bond and biological evaluation as acetylcholinesterase, carbonic anhydrase I and II inhibitors

Journal of Molecular Structure

Research paper thumbnail of Synthesis and Antimicrobial Study of New Benzimidazole Schiff Bases Bearing P-Toluene Sulfonamide Moiety

Journal of the Chilean Chemical Society

Three new Schiff bases bearing benzimidazole and p-toluen sulfonamide moiety were synthesized. Th... more Three new Schiff bases bearing benzimidazole and p-toluen sulfonamide moiety were synthesized. Their structures were characterized by elemental analysis, FTIR, NMR and LCMS methods. The antimicrobial properties of the compounds were also evaluated. All compounds exhibit higher antimicrobial activity against all bacteria, Schiff bases (4a-4c) shows more activity than the parent aldehyde (3). 4c displays higher antibacterial activity against P. aeruginosa compare to reference drug Sulfioxazole. The compounds were found more potent against Gram-negative than Gram positive bacteria. One more free phenyl group increase the activity in 4c, but one more phenyl ring in 4b does not.In vitro antifungal activity of the compounds was also tested on fungi C. albicans C. tropicalis and C. krusei. However, our compounds exhibit no antifungal activity against three fungi.

Research paper thumbnail of Synthesis and Antibacterial Activity of New Chiral Aminoalcohol and Benzimidazole Hybrids

Research paper thumbnail of Bakır(II) Komplekslerinin Glutatyon Redüktaz İnhibitor Çalışması

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

Research paper thumbnail of DNA binding and cleavage activity of three new copper (II) complexes of chiral N-salicyl-β-amino alcohol Schiff bases

Journal of the Mexican Chemical Society

Three new copper(II) complexes (1-3) with general formula [Cu(HL)CH3COO] of N-salicyl-βamino alco... more Three new copper(II) complexes (1-3) with general formula [Cu(HL)CH3COO] of N-salicyl-βamino alcohol Schiff bases containing, (S)-(+)-phenyl glycinol, (1S, 2R)-2-amino-1, 2-diphenylethanol and 1, 1, 3-triphenyl-(R)-(+)-2-amino propanol, were synthesized. Their structures were characterized by FTIR, LCMS, magnetic moment, molar conductance and elemental analysis data. DFT calculations proposed distorted square planar geometries for the complexes. The calculated IR spectra are in good agreement with the experimental IR spectra, confirming the proposed structures. Their interactions with calf thymus DNA were investigated and their binding constants Kb were found. Gel electrophoresis reveals that all complexes display significant nuclease activity against supercoiled pentry/d-topo plasmid DNA.

Research paper thumbnail of Evaluation of new Cu(II) complexes as a novel class of inhibitors against plant carbonic anhydrase, glutathione reductase, and photosynthetic activity in photosystem II

Photosynthesis research, Jan 11, 2017

Increasing inefficiency of production of important agricultural plants raises one of the biggest ... more Increasing inefficiency of production of important agricultural plants raises one of the biggest problems in the modern world. Herbicide application is still the best method of weed management. Traditional herbicides blocking only one of the plant metabolic pathways is ineffective due to the rapid growth of herbicide-resistant weeds. The synthesis of novel compounds effectively suppressing several metabolic processes, and therefore achieving the synergism effect would serve as the alternative approach to weed problem. For this reason, recently, we synthesized a series of nine novel Cu(II) complexes and four ligands, characterized them with different analyses techniques, and carried out their primary evaluation as inhibitors of photosynthetic electron transfer in spinach thylakoids (design, synthesis, and evaluation of a series of Cu(II) based metal-organic complexes as possible inhibitors of photosynthesis, J Photochem Photobiol B, submitted). Here, we evaluated in vitro inhibitory ...

Research paper thumbnail of Characterization of nineteen antimony(III) complexes as potent inhibitors of photosystem II, carbonic anhydrase, and glutathione reductase

Photosynthesis Research, 2016

Nineteen antimony(III) complexes were obtained and examined as possible herbicides. Six of these ... more Nineteen antimony(III) complexes were obtained and examined as possible herbicides. Six of these were synthesized for the first time, and their structures were identified using elemental analyses, (1)H-NMR, (13)C-NMR, FTIR, LCMS, magnetic susceptibility, and conductivity measurement techniques. For the nineteen examined antimony(III) complexes their most-stable forms were determined by DFT/B3LYP/LanL2DZ calculation method. These compounds were examined for effects on photosynthetic electron transfer and carbonic anhydrase activity of photosystem II, and glutathione reductase from chloroplast as well were investigated. Our results indicated that all antimony(III) complexes inhibited glutathione reductase activity of chloroplast. A number of these also exhibited good inhibitory efficiency of the photosynthetic and carbonic anhydrase activity of Photosystem II.

Research paper thumbnail of Antimony(III) complexes with 2-amino-4,6-dimethoxypyrimidines: Synthesis, characterization and biological evaluation

Journal of Photochemistry and Photobiology B: Biology, 2015

Novel pyrimidine compound bearing disulfide bridge, 5,5&a... more Novel pyrimidine compound bearing disulfide bridge, 5,5'-disulfanediylbis(2-amino-4,6-dimetoxypyrimidine) (3) was synthesized by reduction of 2-amino-4,6-dimethoxy-5-thiocyanatopyrimidine for the first time, and its structure was confirmed by X-ray crystallographic analysis. Novel binuclear antimony(III) compound of (3), {Sb[5,5'-disulfanediylbis(2-amino-4,6-dimetoxypyrimidine)]Cl3}2 (4) and mononuclear antimony(III) compounds, SbL2Cl3, [L: 2-amino-5-thiol-4,6-dimethoxy pyrimidine (2) and 2-amino-5-(1H-tetrazol-5-ylthio)-4,6-dimethoxypyrimidine (6)] were synthesized and characterized with the help of elemental analysis, molecular conductivity, FT-IR, (1)H-NMR and LC-MS techniques. The geometrical structures optimized by a DFT/B3LYP/LANL2DZ method of the compounds, indicated that monomeric compounds have square pyramidal shape. Both antileishmanial activity against Leishmania tropica promastigote and glutathione reductase inhibitory activity were determined in vitro. The results showed that (3) has the best biological activity.

Research paper thumbnail of A new method for screening glutathione reductase inhibitors using square wave voltammetry

Anal. Methods, 2015

A novel square wave voltammetric method was developed for the detection of GR activity by measure... more A novel square wave voltammetric method was developed for the detection of GR activity by measurement of diffusion current of GSH.

Research paper thumbnail of DNA cleavage, antimicrobial studies and a DFT-based QSAR study of new antimony(III) complexes as glutathione reductase inhibitor

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015

New antimony(III) complexes, [Sb(2-aminopyridine)2Cl3] (1a), [Sb(2-aminopyridine)2Br3] (1b), [Sb(... more New antimony(III) complexes, [Sb(2-aminopyridine)2Cl3] (1a), [Sb(2-aminopyridine)2Br3] (1b), [Sb(5-methyl-2-aminopyridine)2Cl3] (2a), [Sb(5-methyl-2-aminopyridine)2Br3] (2b), [Sb(2-aminopyrimidine)2Cl3] (3a), [Sb(2-aminopyrimidine)2Br3] (3b), [Sb(4,6-dimethoxy-2-aminopyrimidine)2Cl3] (4a), [Sb(4,6-dimethoxy-2-aminopyrimidine)2Br3] (4b), [Sb(2-amino-1,3,5-triazine)2Cl3] (5a), [Sb(2-amino-1,3,5-triazine)2Br3] (5b), [Sb(2-guanidinobenzimidazole) Cl3] (6a), [Sb(2-guanidinobenzimidazole)Br3] (6b) [Sb(2- benzyl-2-thiopseudeourea)2Cl3] (7a) and [Sb(2- benzyl-2-thiopseudeourea)2Br3] (7b) were synthesized. Their structures were characterized by elemental analysis, molecular conductivity, FT-IR, (1)H NMR, LC-MS techniques. Glutathione reductase inhibitor activity, antimicrobial activity and DNA cleavage studies of the complexes were determined. The geometrical structures of the complexes were optimized by DFT/B3LYP method with LANL2DZ as basis set. Calculation results indicated that the equilibrium geometries of all complexes have square pyramidal shape. About 350 molecular descriptors (constitutional, topological, geometrical, electrostatic and quantum chemical parameters) of the complexes were calculated by DFT/B3LYP/LANL2DZ method with CODESSA software. Calculated molecular parameters were correlated to glutathione reductase inhibitory activity values (pIC50) of all complexes by Best Multi-Linear Regression (BMLR) method. Obtained two-parameter QSAR equation shows that increase in "maximum partial charge for a H atom" and decrease in HOMO-LUMO gap would be favorable for the glutathione reductase inhibitory activity.

Research paper thumbnail of Development of a new enrichment method for simultaneous determination of copper and zinc in water samples

Environmental Toxicology and Chemistry, 2011

In the present study, an enrichment and separation method for the simultaneous determination of t... more In the present study, an enrichment and separation method for the simultaneous determination of trace amounts of Cu and Zn in water samples was developed. Copper and Zn ions found in water matrix in trace amounts were preconcentrated on Duolite XAD 761 resin without using any chelating agent and determined by flame atomic absorption spectrometer (FAAS). Experimental parameters such as pH, concentration of metal ions, amount of resin, and sample volume for quantitative determination of Cu and Zn ions were optimized. The elution process was performed by using 5 ml of 2 mol/L HCl solution. The preconcentration factors for Cu and Zn were found to be 160 and 200, respectively. Under optimized conditions, limit of detection for Cu and Zn were 2.46 and 3.54 µg/L, respectively. The Langmuir adsorption model was applied to describe the equilibrium isotherm. The Langmuir monolayer adsorption capacity of resin was estimated as 31.2 and 17.7 mg/g for Cu and Zn, respectively. The proposed method was successfully applied to determine the Cu and Zn content of various water samples.

Research paper thumbnail of Development of a new enrichment method for simultaneous determination of copper and zinc in water samples

… Toxicology and Chemistry, 2011

In the present study, an enrichment and separation method for the simultaneous determination of t... more In the present study, an enrichment and separation method for the simultaneous determination of trace amounts of Cu and Zn in water samples was developed. Copper and Zn ions found in water matrix in trace amounts were preconcentrated on Duolite XAD 761 resin without using any chelating agent and determined by flame atomic absorption spectrometer (FAAS). Experimental parameters such as pH, concentration of metal ions, amount of resin, and sample volume for quantitative determination of Cu and Zn ions were optimized. The elution process was performed by using 5 ml of 2 mol/L HCl solution. The preconcentration factors for Cu and Zn were found to be 160 and 200, respectively. Under optimized conditions, limit of detection for Cu and Zn were 2.46 and 3.54 µg/L, respectively. The Langmuir adsorption model was applied to describe the equilibrium isotherm. The Langmuir monolayer adsorption capacity of resin was estimated as 31.2 and 17.7 mg/g for Cu and Zn, respectively. The proposed method was successfully applied to determine the Cu and Zn content of various water samples.

Research paper thumbnail of Development of a new enrichment method for simultaneous determination of copper and zinc in water samples

… Toxicology and Chemistry, 2011

In the present study, an enrichment and separation method for the simultaneous determination of t... more In the present study, an enrichment and separation method for the simultaneous determination of trace amounts of Cu and Zn in water samples was developed. Copper and Zn ions found in water matrix in trace amounts were preconcentrated on Duolite XAD 761 resin without using any chelating agent and determined by flame atomic absorption spectrometer (FAAS). Experimental parameters such as pH, concentration of metal ions, amount of resin, and sample volume for quantitative determination of Cu and Zn ions were optimized. The elution process was performed by using 5 ml of 2 mol/L HCl solution. The preconcentration factors for Cu and Zn were found to be 160 and 200, respectively. Under optimized conditions, limit of detection for Cu and Zn were 2.46 and 3.54 µg/L, respectively. The Langmuir adsorption model was applied to describe the equilibrium isotherm. The Langmuir monolayer adsorption capacity of resin was estimated as 31.2 and 17.7 mg/g for Cu and Zn, respectively. The proposed method was successfully applied to determine the Cu and Zn content of various water samples.