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Pathan J, Tripathi DK, Poluri KM, Chalana A, Adhikari S. Molecular insight into the structural and functional aspects of arene Ru(II) complexes bearing bulky thiourea ligands. J Inorg Biochem 2024; 257:112584. [PMID: 38735072 DOI: 10.1016/j.jinorgbio.2024.112584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 04/29/2024] [Accepted: 05/01/2024] [Indexed: 05/14/2024]
Abstract
Herein we report four new arene ruthenium(II) complexes [RuII(ηAird et al. (2002)6-p-cymene)(L1)к1(S)Cl2] (C1), [RuII(ηAird et al. (2002)6-benzene)(L1)к1(S)Cl2] (C2) where L1 is N-((2,6-dimethylphenyl)carbamothioyl)benzamide (L1), and [RuII(ηAird et al. (2002)6-p-cymene)(L2)к1(S)Cl2] (C3), [RuII(ηAird et al. (2002)6-benzene)(L2)к1(S)Cl2] (C4) where L2 is N-((2,6-diisopropylphenyl)carbamothioyl)benzamide (L2) which were synthesized and evaluated for biological activity. The monodentate coordination of thione sulphur (S) to ruthenium ion along with two terminal chloride was confirmed by X-Ray diffraction analysis thus revealing a typical "piano-stool" pseudo tetrahedral geometry. DPPH radical scavenging activity showed that ligands were less efficient however on complex formation it showed significant efficacy with C4 showing the highest activity. The ligands and ruthenium complexes exhibited minimal to no cytotoxic effects on HEK cells within the concentration range of 10-300 μM. Evaluating the cytotoxicity against prostate cancer cells (DU145) L1, L2 and C1 displayed more pronounced cytotoxic activity with C1 showing high cytotoxicity against the cancer cells, in comparison to cisplatin indicating its potential for further investigation and analysis. Considering this, compound C1 was used to further study its interaction with BSA using fluorescence spectroscopy and it was found to be 2.64 × 106 M-1. Findings from CD spectroscopy indicate the binding in the helix region which was further confirmed with the molecular docking studies.
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Affiliation(s)
- Javedkhan Pathan
- Department of Chemistry, Faculty of Basic and Applied Sciences, Madhav University, Pindwara, Rajasthan 307026, India
| | - Deepak Kumar Tripathi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
| | - Krishna Mohan Poluri
- Department of Biosciences and Bioengineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India; Centre for Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India.
| | - Ashish Chalana
- Department of Chemistry and Biochemistry, Sharda University, Greater Noida, U.P. 201306, India; Centre for Development of Biomaterial, Sharda University, Greater Noida, U.P. 201306, India.
| | - Sanjay Adhikari
- Department of Chemistry, Faculty of Basic and Applied Sciences, Madhav University, Pindwara, Rajasthan 307026, India.
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Mantovani S, Pintus A, Kovtun A, Gondolini A, Casadio S, Sanson A, Marforio TD, Calvaresi M, Rancan M, Armelao L, Bertuzzi G, Melucci M, Bandini M. Graphene Oxide-Arginine Composites: Efficient Dual Function Materials for Integrated CO 2 Capture and Conversion. ChemSusChem 2024; 17:e202301673. [PMID: 38227427 DOI: 10.1002/cssc.202301673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 12/24/2023] [Accepted: 01/16/2024] [Indexed: 01/17/2024]
Abstract
The "on-demand" capture and utilization of CO2 is effectively realized with a readily accessible dual function organic composite. The covalent and controlled derivatization of graphene oxide (GO) surface with naturally occurring arginine led to a "smart" material capable of capturing (chemisorption) CO2 from high-purity flue-gas as well as low-concentration streams (i. e. direct air capture) and concomitant chemical activation toward the incorporation into cyclic carbonates. The overall integrated CO2 capture and conversion (ICCC) strategy has been fully elucidated mechanistically via dedicated computational, spectroscopic and thermal analyses.
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Affiliation(s)
- Sebastiano Mantovani
- Dipartimento di Chimica "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, via P. Gobetti 85, 40129, Bologna, Italy
- The Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council (CNR), via P. Gobetti 101, 40129, Bologna, Italy
| | - Angela Pintus
- The Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council (CNR), via P. Gobetti 101, 40129, Bologna, Italy
| | - Alessandro Kovtun
- The Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council (CNR), via P. Gobetti 101, 40129, Bologna, Italy
| | - Angela Gondolini
- Institute of Science, Technology and Sustainability for Ceramics (ISSMC, former ISTEC), National Research Council (CNR), via Granarolo, 64, 48018, Faenza, RA, Italy
| | - Simone Casadio
- Institute of Science, Technology and Sustainability for Ceramics (ISSMC, former ISTEC), National Research Council (CNR), via Granarolo, 64, 48018, Faenza, RA, Italy
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Alessandra Sanson
- Institute of Science, Technology and Sustainability for Ceramics (ISSMC, former ISTEC), National Research Council (CNR), via Granarolo, 64, 48018, Faenza, RA, Italy
| | - Tainah D Marforio
- Dipartimento di Chimica "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, via P. Gobetti 85, 40129, Bologna, Italy
- Center for Chemical Catalysis - C3, Alma Mater Studiorum - Università di Bologna, via R. Gobetti 85, 40129, Bologna, Italy
| | - Matteo Calvaresi
- Dipartimento di Chimica "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, via P. Gobetti 85, 40129, Bologna, Italy
- Center for Chemical Catalysis - C3, Alma Mater Studiorum - Università di Bologna, via R. Gobetti 85, 40129, Bologna, Italy
| | - Marzio Rancan
- Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council (CNR), c/o Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Lidia Armelao
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
- Department of Chemical Sciences and Materials Technologies (DSCTM), National Research Council (CNR), Piazzale Moro 7, 00185, Roma, Italy
| | - Giulio Bertuzzi
- Dipartimento di Chimica "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, via P. Gobetti 85, 40129, Bologna, Italy
- Center for Chemical Catalysis - C3, Alma Mater Studiorum - Università di Bologna, via R. Gobetti 85, 40129, Bologna, Italy
| | - Manuela Melucci
- The Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council (CNR), via P. Gobetti 101, 40129, Bologna, Italy
| | - Marco Bandini
- Dipartimento di Chimica "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, via P. Gobetti 85, 40129, Bologna, Italy
- Center for Chemical Catalysis - C3, Alma Mater Studiorum - Università di Bologna, via R. Gobetti 85, 40129, Bologna, Italy
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Munir MAM, Irshad S, Yousaf B, Ali MU, Dan C, Abbas Q, Liu G, Yang X. Interactive assessment of lignite and bamboo-biochar for geochemical speciation, modulation and uptake of Cu and other heavy metals in the copper mine tailing. Sci Total Environ 2021; 779:146536. [PMID: 34030257 DOI: 10.1016/j.scitotenv.2021.146536] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 03/12/2021] [Accepted: 03/12/2021] [Indexed: 06/12/2023]
Abstract
This study was designed to examine the combined effect of bamboo-biochar (BC) and water-washed lignite (LGT) at copper mine tailings (CuMT) sites on the concentration of Cu and other metals in pore water (PW), their bioavailability, and change in geochemical speciation. Rapeseed (first cropping-season) and wheat (second cropping-season) were grown for 40-days each and the influence of applied-amendments on both cropping seasons was observed and compared. A significant increase in pH, water holding capacity (WHC), and soil organic carbon (SOC) was observed after the applied amendments in second cropping-seasons. The BC-LGT significantly reduced the concentration of Cu in PW after second cropping seasons; however, the concentration of Pb and Zn were increased with the individual application of biochar and LGT, respectively. BC-LGT and BC-2% significantly reduced the bioavailability of Cu and other HMs in both cropping seasons. The treated-CuMT was subjected to spectroscopic investigation through X-ray photoelectron spectroscopy (XPS), Fourier transform Infrared spectroscopy (FTIR), and X-ray powder diffraction (XRD). The results showed that Cu sorption mainly involved the coordination with hydroxyl and carboxyl functional groups, as well as the co-precipitation or complexation on mineral surfaces, which vary with the applied amendment and bulk amount of Mg, Mn, and Fe released during sorption-process. The co-application of BC-LGT exerted significant effectiveness in immobilizing Cu and other HMs in CuMT. The outcomes of the study indicated that co-application of BC-LGT is an efficacious combination of organic and inorganic materials for Cu adsorption which may provide some new information for the sustainable remediation of copper mine tailing.
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Affiliation(s)
- Mehr Ahmed Mujtaba Munir
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, Zijingang Campus, Yuhangtang Road 866, Hangzhou 310058, China; CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi 710075, China.
| | - Samina Irshad
- CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi 710075, China.
| | - Balal Yousaf
- CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi 710075, China; Environmental Engineering Department, Middle East Technical University, Ankara 06800, Turkey.
| | - Muhammad Ubaid Ali
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, and State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518000, China.
| | - Chen Dan
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, Zijingang Campus, Yuhangtang Road 866, Hangzhou 310058, China.
| | - Qumber Abbas
- Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Guijian Liu
- CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi 710075, China.
| | - Xiaoe Yang
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, Zijingang Campus, Yuhangtang Road 866, Hangzhou 310058, China.
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Pawar SK, Jaldappagari S. Interaction of repaglinide with bovine serum albumin: Spectroscopic and molecular docking approaches. J Pharm Anal 2019; 9:274-283. [PMID: 31452966 PMCID: PMC6702422 DOI: 10.1016/j.jpha.2019.03.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 03/12/2019] [Accepted: 03/13/2019] [Indexed: 01/28/2023] Open
Abstract
Repaglinide (RPG) regulates the amount of glucose by stimulating the pancreas to release insulin in the blood. In view of its biological importance, we have examined the interaction between RPG and a model protein, bovine serum albumin (BSA) employing various spectroscopic, electrochemical and molecular docking methods. Fluorescence spectra of BSA were recorded in the presence and absence of RPG in phosphate buffer of pH 7.4. Fluorescence intensity of BSA was decreased upon the addition of increased concentrations of RPG, indicating the interaction between RPG and BSA. Stern-Volmer quenching analysis results revealed that RPG quenched the intensity of BSA through dynamic quenching mechanism. This was further confirmed from the time-resolved fluorescence measurements. The binding constant as calculated from the spectroscopic and voltammetric results was observed to be in the order of 104 M−1 at 298 K, suggesting the moderate binding affinity between RPG and BSA. Competitive experimental results revealed that the primary binding site for RPG on BSA was site II. Absorption and circular dichroism studies indicated the changes in the secondary structure of BSA upon its interaction with RPG. Molecular simulation studies pointed out that RPG was bound to BSA in the hydrophobic pocket of site II. Dynamic mode of quenching mechanism was noticed in RPG-BSA interaction. RPG was bound to BSA at the Sudlow’s site II and the resultant RPG-BSA complex was mainly stabilized by hydrophobic forces. The binding constant of RPG-BSA of the order of 104 M−1 at 298 K indicated the non-covalent interactions. Secondary structural changes in BSA upon binding to RPG were evident from absorption and circular dichroism studies. The influence of β-cyclodextrin and metal ions on RPG-BSA binding affinity was examined.
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Affiliation(s)
- Suma K Pawar
- Department of Chemistry, Karnatak University, Dharwad 580 003, India
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Bağda E, Yabaş E, Bağda E. Analytical approaches for clarification of DNA-double decker phthalocyanine binding mechanism: As an alternative anticancer chemotherapeutic. Spectrochim Acta A Mol Biomol Spectrosc 2017; 172:199-204. [PMID: 26803444 DOI: 10.1016/j.saa.2016.01.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 01/12/2016] [Accepted: 01/12/2016] [Indexed: 06/05/2023]
Abstract
In the present study a novel water soluble double-decker phthalocyanine was synthesized and calf thymus DNA interaction of the synthesized double-decker phthalocyanine was investigated. 5-(3-pyridyl)-1,3,4-oxadiazole substituted phthalonitrile 1 was prepared by a nucleophilic displacement reaction of 4-nitrophthalonitrile with 5-(3-pyridyl)-1,3,4-oxadiazole-2-thiol. Lutetium(III) double-decker phthalocyanine 2 was prepared by cyclotetramerization of compound 1. Water soluble lutetium(III) double-decker phthalocyanine 3 was prepared with quaternarization of compound 2. The synthesized double-decker phthalocyanine and calf thymus DNA interaction was investigated with UV-vis titrimetric methods, gel electrophoresis, and viscosity measurements. The fluorometric ethidium bromide replacement assay was conducted to clarify the binding mode of water soluble double-decker phthalocyanine. The thermodynamic parameters for interaction, K, ΔG0, ΔH0 and ΔS0 were calculated between the temperature ranges of 25°C-75°C. To the best of our knowledge, this is the first study about a double-decker phthalocyanine and DNA interaction.
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Affiliation(s)
- Esra Bağda
- Cumhuriyet University, Faculty of Pharmacy, Department of Analytical Chemistry, Sivas, Turkey
| | - Ebru Yabaş
- Cumhuriyet University, Faculty of Science, Department of Chemistry, Sivas, Turkey
| | - Efkan Bağda
- Cumhuriyet University, Faculty of Science, Department of Molecular Biology and Genetic, Sivas, Turkey.
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Roy MN, Roy A, Saha S. Probing inclusion complexes of cyclodextrins with amino acids by physicochemical approach. Carbohydr Polym 2016; 151:458-466. [PMID: 27474589 DOI: 10.1016/j.carbpol.2016.05.100] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 05/26/2016] [Accepted: 05/27/2016] [Indexed: 10/21/2022]
Abstract
Formations of host-guest inclusion complexes of two natural amino acids, viz., l-Leucine and l-Isoleucine as guests with α and β-cyclodextrins have been investigated which include diverse applications in modern science such as controlled delivery in the field of pharmaceuticals, food processing etc. Surface tension and conductivity studies establish the formation of inclusion complexes with 1:1 stoichiometry. The interactions of cyclodextrins with amino acids have been supported by density, viscosity, refractive index, hydration and solvation number measurements indicating higher degree of inclusion in case of α-cyclodextrin. l-Leucine interacts more with the hydrophobic cavity of cyclodextrin than its isomer. With the help of stability constant by NMR titration, hydrophobic effect, H-bonds and structural effects the formations of inclusion complexes have been explained.
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Affiliation(s)
- Mahendra Nath Roy
- Department of Chemistry, University of North Bengal, Darjeeling 734013, India.
| | - Aditi Roy
- Department of Chemistry, University of North Bengal, Darjeeling 734013, India
| | - Subhadeep Saha
- Department of Chemistry, University of North Bengal, Darjeeling 734013, India
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Zayed EM, Zayed MA. Synthesis of novel Schiff's bases of highly potential biological activities and their structure investigation. Spectrochim Acta A Mol Biomol Spectrosc 2015; 143:81-90. [PMID: 25721778 DOI: 10.1016/j.saa.2015.02.024] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 12/09/2014] [Accepted: 02/04/2015] [Indexed: 06/04/2023]
Abstract
Novel bisaldehyde-hydrazide Schiff's bases AS1 (2,2'-(ethane-1,2-diylbis(oxy))dibenzaldehyde terephthalohydrazide) and AS2 (N',N'″-(((ethane-1,2-diylbis(oxy))bis(2,1-phenylene))bis(methanylylidene))di(benzohydrazide)) were prepared as new macrocyclic compounds via condensation reactions. AS1 had been prepared by condensation between (2,2'-(ethane-1,2-diylbis(oxy))dibenzaldehyde) bisaldehyde and terephthalohydrazide in a ratio1:1. AS2 had been obtained by condensation between (2,2'-(ethane-1,2-diylbis(oxy))dibenzaldehyde) bisaldehyde and benzohydrazide in ratio 1:2. The structures of AS1 and AS2 were characterized by elemental analysis (EA), mass (MS), FT-IR and (1)H-NMR spectra, and thermal analyses (TG, DTG). The activation thermodynamic parameters such as ΔE(∗), ΔH(∗), ΔS(∗) and ΔG(∗) were calculated from the TG curves using Coats-Redfern method. It is important to investigate their molecular structures to know the active groups and weak bonds responsible for their biological activities. Consequently in the present work, the obtained thermal (TA) and mass (MS) practical results are confirmed by semi-empirical MO-calculations (MOCS) using PM3 procedure. Their biological activities had been tested in vitro against Escherichia coli, Proteus vulgaris, Bacillus subtilis and Staphylococcus aurous bacteria in order to assess their anti-microbial potential.
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Affiliation(s)
- Ehab M Zayed
- Green Chemistry Department, National Research Centre, Dokki, 12622 Giza, Egypt
| | - M A Zayed
- Chemistry Department, Faculty of Science, Cairo University, 12613 Giza, Egypt.
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Belal AAM, Zayed MA, El-Desawy M, Rakha SMAH. Structure investigation of three hydrazones Schiff's bases by spectroscopic, thermal and molecular orbital calculations and their biological activities. Spectrochim Acta A Mol Biomol Spectrosc 2015; 138:49-57. [PMID: 25437844 DOI: 10.1016/j.saa.2014.10.091] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 10/17/2014] [Accepted: 10/23/2014] [Indexed: 06/04/2023]
Abstract
Three Schiff's bases AI (2(1-hydrazonoethyl)phenol), AII (2, 4-dibromo 6-(hydrazonomethyl)phenol) and AIII (2(hydrazonomethyl)phenol) were prepared as new hydrazone compounds via condensation reactions with molar ratio (1:1) of reactants. Firstly by reaction of 2-hydroxy acetophenone solution and hydrazine hydrate; it gives AI. Secondly condensation between 3,5-dibromo-salicylaldehyde and hydrazine hydrate gives AII. Thirdly condensation between salicylaldehyde and hydrazine hydrate gives AIII. The structures of AI-AIII were characterized by elemental analysis (EA), mass (MS), FT-IR and (1)H NMR spectra, and thermal analyses (TG, DTG, and DTA). The activation thermodynamic parameters, such as, ΔE(∗), ΔH(∗), ΔS(∗) and ΔG(∗) were calculated from the TG curves using Coats-Redfern method. It is important to investigate their molecular structures to know the active groups and weak bond responsible for their biological activities. Consequently in the present work, the obtained thermal (TA) and mass (MS) practical results are confirmed by semi-empirical MO-calculations (MOCS) using PM3 procedure. Their biological activities have been tested in vitro against Escherichia coli, Proteus vulgaris, Bacillissubtilies and Staphylococcus aurous bacteria in order to assess their anti-microbial potential.
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Affiliation(s)
- Arafa A M Belal
- Chemistry Department, Faculty of Science, Port Said University, Egypt
| | - M A Zayed
- Chemistry Department, Faculty of Science, Cairo University, 12613, Egypt.
| | - M El-Desawy
- Nuclear Physics Department, Nuclear Research Center, AEA, 13759 Cairo, Egypt
| | - Sh M A H Rakha
- Chemistry Department, Faculty of Science, Port Said University, Egypt
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Zayed EM, Zayed MA, El-Desawy M. Preparation and structure investigation of novel Schiff bases using spectroscopic, thermal analyses and molecular orbital calculations and studying their biological activities. Spectrochim Acta A Mol Biomol Spectrosc 2015; 134:155-164. [PMID: 25016203 DOI: 10.1016/j.saa.2014.06.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2014] [Revised: 05/19/2014] [Accepted: 06/03/2014] [Indexed: 06/03/2023]
Abstract
Two novel Schiff's bases (EB1 and L1) as new macrocyclic compounds were prepared via condensation reactions between bisaldehyde (2,2'-(ethane-1,2-diylbis(oxy))dibenzaldehyde): firstly with hydrazine carbothioamide to give (EB1), secondly with 4,6-diaminopyrimidine-2-thiol to give (L1). EB1 has a general formula C₁₈H₂₀N₆O₂S₂ of mole mass=416.520, and IUPAC name ((N,N'Z,N,N'E)-N,N'-(((ethane1,2diylbis(oxy))bis(2,1phenylene))bis(methanylylidene))bis(1hydrazinylmethanethioamide). L1 has a general formula C₂₀H₁₆N₄O₂S of mole mass=376.10; and IUPAC name 1,2-bis(2-vinylphenoxy)ethane4,6-diaminopyrimidine-2-thiol). The structures of the compounds obtained were characterized based on elemental analysis, FT-IR and (1)H NMR spectra, mass, and thermogravimetric analysis (TG, DTG). The activation thermodynamic parameters, such as, ΔE(*), ΔH(*), ΔS(*) and ΔG(*) were calculated from the TG curves using Coats-Redfern method. It is important to investigate their structures to know the active groups and weak bond responsible for their biological activities. The obtained thermal (TA) and mass (MS) practical results are confirmed by semi-empirical MO-calculation using PM3 procedure, on the neutral and positively charged forms of these novel Schiff bases. Therefore, comparison between MS and TA helps in selection of the proper pathway representing the decomposition of these compounds to give indication about their structures and consequently their biological activities. Their biological activities have been tested in vitro against Escherichia coli, Proteus vulgaris, Bacillissubtilies and Staphylococcus aurous bacteria in order to assess their antimicrobial potential.
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Affiliation(s)
- Ehab M Zayed
- Green Chemistry Department, National Research Centre, Dokki, 12622 Giza, Egypt
| | - M A Zayed
- Chemistry Department, Faculty of Science, Cairo University, 12613 Giza, Egypt.
| | - M El-Desawy
- Nuclear Physics Department, Nuclear Research Center, AEA, 13759 Cairo, Egypt
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Abstract
Hyaluronic acid (HA) being a viscous slippery substance is a multifunctional glue with immense therapeutic applications such as ophthalmic surgery, orthopedic surgery and rheumatology, drug delivery systems, pulmonary pathology, joint pathologies, and tissue engineering. Although HA has been isolated from terrestrial origin (human umbilical cord, rooster comb, bacterial sources, etc.) so far, the increasing interest on this polysaccharide significantly aroused the alternative search from marine sources since it is at the preliminary level. Enthrallingly, marine environments are considered more biologically diverse than terrestrial environments. Although numerous methods have been described for the extraction and purification of HA, the hitch on the isolation methods which greatly influences the yield as well as the molecular weight of the polymer still exists. Adaptation of suitable method is essential in this venture. Stimulated by the developed technology, to sketch the steps involved in isolation and analytical techniques for characterization of this polymer, a brief report on the concerned approach has been reviewed.
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Affiliation(s)
- Sadhasivam Giji
- Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai, Tamil Nadu, India
| | - Muthuvel Arumugam
- Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai, Tamil Nadu, India.
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Patil SA, Medina PA, Ziller JW, Fahlman BD. Syntheses, characterizations and thermal analyses of four novel unsymmetrical β-diketiminates. Springerplus 2013; 2:32. [PMID: 23525855 PMCID: PMC3602636 DOI: 10.1186/2193-1801-2-32] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 12/17/2012] [Indexed: 11/24/2022]
Abstract
Four novel unsymmetrical β-diketiminates 2-(2,6-diisopropylphenyl)amino-4-(phenyl)imino-2-pentene (4a), 2-(2,6-diisopropylphenyl)amino-4-(4-methylphenyl)imino-2-pentene (4b), 2-(2,6-diisopropylphenyl)amino-4-(4-methoxyphenyl)imino-2-pentene (4c) and 2-(2,6-diisopropylphenyl)amino-4-(4-chlorophenyl)imino-2-pentene (4d) were synthesized with a 77-84% yield, and were characterized by spectroscopic methods (1H NMR, 13C NMR, IR and mass spectrometry), elemental analysis, and X-ray single-crystal diffraction, respectively. Spectroscopic and X-ray single-crystal diffraction analyses determined the structures of the four β-diketiminates. While thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) showed two distinct endothermic peaks for each β-diketiminate at temperatures of 92.55°C and 221.50°C (4a), 93.51°C and 238.82°C (4b), 109.60°C and 329.22°C (4c), 115.43°C and 243.25°C (4d), respectively, corresponding to their melting and boiling points.
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Affiliation(s)
- Siddappa A Patil
- Department of Chemistry & Science of Advanced Materials Program, Central Michigan University, Mount Pleasant, MI 48859 USA
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