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Feizi H, Alizadeh M, Azimi H, Khodadadi E, Kamounah FS, Ganbarov K, Ghotaslou R, Rezaee MA, Kafil HS. Induction of proteome changes involved in the cloning of mcr-1 and mcr-2 genes in Escherichia coli DH5-α strain to evaluate colistin resistance. J Glob Antimicrob Resist 2024; 36:151-159. [PMID: 38154746 DOI: 10.1016/j.jgar.2023.12.018] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 12/14/2023] [Accepted: 12/15/2023] [Indexed: 12/30/2023] Open
Abstract
OBJECTIVES Plasmid genes, termed mobile colistin resistance-1 (mcr-1) and mobile colistin resistance-2 (mcr-2), are associated with resistance to colistin in Escherichia coli (E. coli). These mcr genes result in a range of protein modifications contributing to colistin resistance. This study aims to discern the proteomic characteristics of E. coli-carrying mcr-1 and mcr-2 genes. Furthermore, it evaluates the expression levels of various proteins under different conditions (with and without colistin). METHODS Plasmid extraction was performed using an alkaline lysis-based plasmid extraction kit, whereas polymerase chain reaction was used to detect the presence of mcr-1 and mcr-2 plasmids. The E. coli DH5α strain served as the competent cell for accepting and transforming mcr-1 and mcr-2 plasmids. We assessed proteomic alterations in the E. coli DH5α strain both with and without colistin in the growth medium. Proteomic data were analysed using mass spectrometry. RESULTS The findings revealed significant protein changes in the E. coli DH5α strain following cloning of mcr-1 and mcr-2 plasmids. Of the 20 proteins in the DH5α strain, expression in 8 was suppressed following transformation. In the presence of colistin in the culture medium, 39 new proteins were expressed following transformation with mcr-1 and mcr-2 plasmids. The proteins with altered expression play various roles. CONCLUSION The results of this study highlight numerous protein alterations in E. coli resulting from mcr-1 and mcr-2-mediated resistance to colistin. This understanding can shed light on the resistance mechanism. Additionally, the proteomic variations observed in the presence and absence of colistin might indicate potential adverse effects of indiscriminate antibiotic exposure on treatment efficacy and heightened pathogenicity of microorganisms.
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Affiliation(s)
- Hadi Feizi
- Department of Medical Microbiology, Aalinasab Hospital, Social Security Organization, Tabriz, Iran; Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Maryam Alizadeh
- Pharmaceutical Nanotechnology Research Centre, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hadi Azimi
- Department of Microbiology, Islamic Azad University of Zanjan, Zanjan, Iran
| | - Ehsaneh Khodadadi
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Khudaverdi Ganbarov
- Research Laboratory of Microbiology and Virology, Baku State University, Baku, Azerbaijan
| | - Reza Ghotaslou
- Immunology Research Centre, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Hossein Samadi Kafil
- Drug Applied Research Centre, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
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Rehhagen C, Argüello Cordero MA, Kamounah FS, Deneva V, Angelov I, Krupp M, Svenningsen SRW, Pittelkow M, Lochbrunner S, Antonov L. Reversible Switching Based on Truly Intramolecular Long-Range Proton Transfer─Turning the Theoretical Concept into Experimental Reality. J Am Chem Soc 2024; 146:2043-2053. [PMID: 38214997 DOI: 10.1021/jacs.3c10789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2024]
Abstract
Herein, we demonstrate a working prototype of a conjugated proton crane, a reversible tautomeric switching molecule in which truly intramolecular long-range proton transfer occurs in solution at room temperature. The system consists of a benzothiazole rotor attached to a 7-hydroxy quinoline stator. According to the experimental and theoretical results, the OH proton is delivered under irradiation to the quinolyl nitrogen atom through a series of consecutive proton transfer and twisting steps. The use of a rigid rotor prevents undesired side processes that decrease the switching performance in previously described proton cranes and provides an unprecedented switching efficiency and fatigue resistance. The newly designed system confirms the theoretical concept for the application of proton transfer-initiated intramolecular twisting as the switching mechanism, developed more than 10 years ago, and provides unique insights for the further development of tautomeric molecular switches and motors, molecular logic gates, and new molecular-level energy storage systems.
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Affiliation(s)
- Chris Rehhagen
- Institute for Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany
| | - Miguel A Argüello Cordero
- Institute for Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
| | - Vera Deneva
- Institute of Electronics, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria
| | - Ivan Angelov
- Institute of Electronics, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria
| | - Marvin Krupp
- Institute for Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany
| | - So Ren W Svenningsen
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
| | - Michael Pittelkow
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
| | - Stefan Lochbrunner
- Institute for Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany
| | - Liudmil Antonov
- Institute of Electronics, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria
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Warthegau SS, Hillers-Bendtsen AE, Pedersen SK, Rindom C, Braestrup C, Jensen JS, Hammerich O, Thomsen MS, Kamounah FS, Norman P, Mikkelsen KV, Brock-Nannestad T, Pittelkow M. Heterocyclic [9]Helicenes Exhibiting Bright Circularly Polarized Luminescence. Chemistry 2023; 29:e202301815. [PMID: 37458527 DOI: 10.1002/chem.202301815] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 07/17/2023] [Indexed: 09/14/2023]
Abstract
We describe a concise synthetic strategy for the preparation of heterocyclic [9]helicenes and a simple preparative-scale protocol for the optical resolution of the resulting M- and P-enantiomers. The helicenes were characterized by single-crystal X-ray diffraction along with a range of spectroscopic and computational techniques. A fluorescence quantum yield of up to 65 % was observed, and the chiroptical properties of both M- and P-helicenes revealed large dissymmetry factors. The circularly polarized luminescence brightness reaches up to 17 M-1 cm-1 , as measured experimentally and verified computationally, which makes this the highest circularly polarized luminescence brightness among heterocyclic helicenes. We describe how chiroptical properties (both circular dichroism and circularly polarized luminescence) can be described and predicted using quantum chemical calculations. The synthetic approach also reveals by-products that originate from internal oxidation reactions, presumably mediated by the close proximity of the π-surfaces in the helicene structure.
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Affiliation(s)
- Stefan S Warthegau
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | | | - Stephan K Pedersen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Cecilie Rindom
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Christoffer Braestrup
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Jeppe S Jensen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Ole Hammerich
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Maria S Thomsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Patrick Norman
- Division of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden
| | - Kurt V Mikkelsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Theis Brock-Nannestad
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Michael Pittelkow
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen Ø, Denmark
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Hansen PE, Darugar V, Vakili M, Kamounah FS. Tautomerism of pyridinylbutane-1,3-diones: An NMR and DFT study. Magn Reson Chem 2023; 61:356-362. [PMID: 36882383 DOI: 10.1002/mrc.5342] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 03/01/2023] [Accepted: 03/03/2023] [Indexed: 05/11/2023]
Abstract
The three possible 1-(n-pyridinyl)butane-1,3-diones (nPM) have been synthesized. Structures, tautomerism, and conformations are investigated by means of DFT calculations. 1 H and 13 C NMR spectra are assigned, and deuterium isotope effects on 13 C chemical shifts have been measured. Analysis of the isotope effects leads to the equilibrium constants of the keto-enol tautomers. Some interesting differences are seen between the three compounds and the phenyl analogs. The isotope effects can also rank the hydrogen bonds of the compounds, with the one with nitrogen in the three positions of the pyridine ring as the weakest. Structures, conformers, energies, and NMR nuclear shieldings are calculated using DFT calculations at the B3LYP/6-311++G(d,p) level.
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Affiliation(s)
- Poul Erik Hansen
- Department of Science and Environment, Roskilde University, Roskilde, Denmark
| | - Vahidreza Darugar
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohammad Vakili
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
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Ozma MA, Moaddab SR, Hosseini H, Khodadadi E, Ghotaslou R, Asgharzadeh M, Abbasi A, Kamounah FS, Aghebati Maleki L, Ganbarov K, Samadi Kafil H. A critical review of novel antibiotic resistance prevention approaches with a focus on postbiotics. Crit Rev Food Sci Nutr 2023:1-19. [PMID: 37203933 DOI: 10.1080/10408398.2023.2214818] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Antibiotic resistance is a significant public health issue, causing illnesses that were once easily treatable with antibiotics to develop into dangerous infections, leading to substantial disability and even death. To help fight this growing threat, scientists are developing new methods and techniques that play a crucial role in treating infections and preventing the inappropriate use of antibiotics. These effective therapeutic methods include phage therapies, quorum-sensing inhibitors, immunotherapeutics, predatory bacteria, antimicrobial adjuvants, haemofiltration, nanoantibiotics, microbiota transplantation, plant-derived antimicrobials, RNA therapy, vaccine development, and probiotics. As a result of the activity of probiotics in the intestine, compounds derived from the structure and metabolism of these bacteria are obtained, called postbiotics, which include multiple agents with various therapeutic applications, especially antimicrobial effects, by using different mechanisms. These compounds have been chosen in particular because they don't promote the spread of antibiotic resistance and don't include substances that can increase antibiotic resistance. This manuscript provides an overview of the novel approaches to preventing antibiotic resistance with emphasis on the various postbiotic metabolites derived from the gut beneficial microbes, their activities, recent related progressions in the food and medical fields, as well as concisely giving an insight into the new concept of postbiotics as "hyperpostbiotic".
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Affiliation(s)
- Mahdi Asghari Ozma
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Seyyed Reza Moaddab
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hedayat Hosseini
- Department of Food Science and Technology, National Nutrition and Food Technology Research Institute, Faculty of Nutrition Science and Food Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ehsaneh Khodadadi
- Material Science and Engineering, Department of Chemistry and Biochemistry, University of Arkansas-Fayetteville, Fayetteville, AR, USA
| | - Reza Ghotaslou
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Asgharzadeh
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Amin Abbasi
- Department of Food Science and Technology, National Nutrition and Food Technology Research Institute, Faculty of Nutrition Science and Food Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | | | - Khudaverdi Ganbarov
- Research Laboratory of Microbiology and Virology, Baku State University, Baku, Republic of Azerbaijan
| | - Hossein Samadi Kafil
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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Fabijanić I, Kurutos A, Tomašić Paić A, Tadić V, Kamounah FS, Horvat L, Brozovic A, Crnolatac I, Radić Stojković M. Selenium-Substituted Monomethine Cyanine Dyes as Selective G-Quadruplex Spectroscopic Probes with Theranostic Potential. Biomolecules 2023; 13:biom13010128. [PMID: 36671513 PMCID: PMC9856044 DOI: 10.3390/biom13010128] [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] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/31/2022] [Accepted: 01/05/2023] [Indexed: 01/11/2023] Open
Abstract
The binding interactions of six ligands, neutral and monocationic asymmetric monomethine cyanine dyes comprising benzoselenazolyl moiety with duplex DNA and RNA and G-quadruplex structures were evaluated using fluorescence, UV/Vis (thermal melting) and circular dichroism (CD) spectroscopy. The main objective was to assess the impact of different substituents (methyl vs. sulfopropyl vs. thiopropyl/thioethyl) on the nitrogen atom of the benzothiazolyl chromophore on various nucleic acid structures. The monomethine cyanine dyes with methyl substituents showed a 100-fold selectivity for G-quadruplex versus duplex DNA. Study results indicate that cyanines bind with G-quadruplex via end π-π stacking interactions and possible additional interactions with nucleobases/phosphate backbone of grooves or loop bases. Cyanine with thioethyl substituent distinguishes duplex DNA and RNA and G-quadruplex structures by distinctly varying ICD signals. Furthermore, cell viability assay reveals the submicromolar activity of cyanines with methyl substituents against all tested human cancer cell lines. Confocal microscopy analysis shows preferential accumulation of cyanines with sulfopropyl and thioethyl substituents in mitochondria and indicates localization of cyanines with methyl in nucleus, particularly nucleolus. This confirms the potential of examined cyanines as theranostic agents, possessing both fluorescent properties and cell viability inhibitory effect.
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Affiliation(s)
- Ivana Fabijanić
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia
| | - Atanas Kurutos
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 9, 1113 Sofia, Bulgaria
| | - Ana Tomašić Paić
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia
| | - Vanja Tadić
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia
| | - Fadhil S. Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Lucija Horvat
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia
| | - Anamaria Brozovic
- Division of Molecular Biology, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia
| | - Ivo Crnolatac
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia
| | - Marijana Radić Stojković
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia
- Correspondence: ; Tel.: +385-14571220; Fax: +385-14680195
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Rezaei T, Kamounah FS, Khodadadi E, Mehramouz B, Gholizadeh P, Yousefi L, Ganbarov K, Ghotaslou R, Yousefi M, Asgharzadeh M, Eslami H, Taghizadeh S, Pirzadeh T, Kafil HS. Comparing proteome changes involved in biofilm formation by Streptococcus mutans after exposure to sucrose and starch. Biotechnol Appl Biochem 2023. [PMID: 36588392 DOI: 10.1002/bab.2442] [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: 06/05/2022] [Accepted: 12/29/2022] [Indexed: 01/03/2023]
Abstract
Streptococcus mutans is a main organism of tooth infections including tooth decay and periodontitis. The aim of this study was to assess the influence of sucrose and starch on biofilm formation and proteome profile of S. mutans ATCC 35668 strain. The biofilm formation was assessed by microtiter plating method. Changes in bacterial proteins after exposure to sucrose and starch carbohydrates were analyzed using matrix-assisted laser desorption/ionization mass spectrometry. The biofilm formation of S. mutans was increased to 391.76% in 1% sucrose concentration, 165.76% in 1% starch, and 264.27% in the 0.5% sucrose plus 0.5% starch in comparison to biofilm formation in the media without sugars. The abundance of glutamines, adenylate kinase, and 50S ribosomal protein L29 was increased under exposure to sucrose. Upregulation of lactate utilization protein C, 5-hydroxybenzimidazole synthase BzaA, and 50S ribosomal protein L16 was formed under starch exposure. Ribosome-recycling factor, peptide chain release factor 1, and peptide methionine sulfoxide reductase MsrB were upregulated under exposure to sucrose in combination with starch. The results demonstrated that the carbohydrates increase microbial pathogenicity. In addition, sucrose and starch carbohydrates can induce biofilm formation of S. mutans via various mechanisms such as changes in the expression of special proteins.
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Affiliation(s)
- Tohid Rezaei
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Ehsaneh Khodadadi
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas, USA
| | - Bahareh Mehramouz
- Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Pourya Gholizadeh
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Leila Yousefi
- Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Khudaverdi Ganbarov
- Research Laboratory of Microbiology and Virology, Baku State University, Baku, Azerbaijan
| | - Reza Ghotaslou
- Research Laboratory of Microbiology and Virology, Baku State University, Baku, Azerbaijan
| | - Mehdi Yousefi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Asgharzadeh
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hosein Eslami
- Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sepehr Taghizadeh
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Tahereh Pirzadeh
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hossein Samadi Kafil
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
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Bazrafshan M, Vakili M, Tayyari SF, Kamounah FS, Hansen PE, Housaindokht MR. Vibrational spectra, conformation and molecular transport of 5-amino-2,2,6,6-tetramethyl-4-hepten-3-one. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Bazrafshan M, Vakili M, Tayyari SF, Kamounah FS, Hansen PE, Shiri A. Synthesis, molecular structure, conformational, and intramolecular hydrogen bond strength of ethyl 3-amino-2-butenoate and its N-Me, N-Ph, and N-Bn analogs; an experimental and theoretical study. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Feizi H, Plotnikov A, Rezaee MA, Ganbarov K, Kamounah FS, Nikitin S, Kadkhoda H, Gholizadeh P, Pagliano P, Kafil HS. Postbiotics versus probiotics in early-onset colorectal cancer. Crit Rev Food Sci Nutr 2022; 64:3573-3582. [PMID: 36250549 DOI: 10.1080/10408398.2022.2132464] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Probiotics and postbiotics mechanisms of action and applications in early-onset colorectal cancer (EOCRC) prevention and treatment have significant importance but are a matter of debate and controversy. Therefore, in this review, we aimed to define the probiotics concept, advantages and limitations in comparison to postbiotics, and proposed mechanisms of anti-tumor action in EOCRC prevention and treatment of postbiotics. Biotics (probiotics, prebiotics, and postbiotics) could confer the health benefit by affecting the host gut microbiota directly and indirectly. The main mechanisms of action of probiotics in exerting anticancer features include immune system regulation, inhibition of cancer cell propagation, gut dysbiosis restoration, anticancer agents' production, gut barrier function renovation, and cancer-promoting agents' reduction. Postbiotics are suggested to have different mechanisms of action to restore eubiosis against EOCRC, including modulation of gut microbiota composition, gut microbial metabolites regulation, and intestinal barrier function improvement via different features such as immunomodulatory, anti-inflammatory, antioxidant, and anti-proliferative properties. A better understanding of postbiotics challenges and mechanism of action in therapeutic applications will allow us to sketch accurate trials in order to use postbiotics as bio-therapeutics in EOCRC.
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Affiliation(s)
- Hadi Feizi
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Andrey Plotnikov
- Institute for Cellular and Intracellular Symbiosis of the Ural Branch of the Russian Academy of Sciences, Orenburg, Russia
| | | | - Khudaverdi Ganbarov
- Research Laboratory of Microbiology and Virology, Baku State University, Baku, Azerbaijan
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Sergei Nikitin
- Department of Science and Environment, Roskilde University, Roskilde, Denmark
| | - Hiva Kadkhoda
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Pourya Gholizadeh
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Hossein Samadi Kafil
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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Mahmoudi G, García-Santos I, Pittelkow M, Kamounah FS, Zangrando E, Babashkina MG, Frontera A, Safin DA. The tetrel bonding role in supramolecular aggregation of lead(II) acetate and a thiosemicarbazide derivative. Acta Crystallogr B Struct Sci Cryst Eng Mater 2022; 78:685-694. [PMID: 35975834 DOI: 10.1107/s2052520622005789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 10/14/2021] [Accepted: 05/29/2022] [Indexed: 06/15/2023]
Abstract
A new PbII coordination complex [PbL(OAc)], which was readily synthesized from a mixture of Pb(OAc)2·3H2O and 1-(pyridin-2-yl)benzylidene-4-phenylthiosemicarbazide (HL) is reported. The crystal structure analysis of [PbL(OAc)] showed that the PbII cation is N,N',S-chelated by the tridentate pincer-type ligand L and by the oxygen atoms of the acetate anion. In addition, the metal centre forms Pb...O and Pb...S tetrel bonds with an adjacent complex molecule, yielding a 1D zigzag polymeric chain, which is reinforced by N-H...O hydrogen bonds and π...π interactions. These chains are interlinked by C-H...py non-covalent interactions, realized between one of the acetate hydrogen atoms and the pyridine rings. According to the Hirshfeld surface analysis, the crystal packing is mainly characterized by intermolecular H...H, H...C and H...O contacts, followed by H...N, H...S, C...C, C...N, Pb...H, Pb...O and Pb...S contacts. The FTIR and 1H NMR spectra of [PbL(OAc)] testify to the deprotonation of the parent ligand HL, while the acetate ligand exhibits an anisobidentate coordination mode as established by means of single-crystal X-ray diffraction and FTIR spectroscopy. Lastly, theoretical calculations at the PBE0-D3/def2-TZVP level of theory have been used to analyze and characterize the Pb...O and Pb...S tetrel bonds observed in the crystal of [PbL(OAc)], using a combination of QTAIM (Quantum Theory of Atoms in Molecules) and NCIPlot (Non-Covalent Interaction Plot) computational tools.
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Affiliation(s)
- Ghodrat Mahmoudi
- Department of Chemistry, Faculty of Science, University of Maragheh, PO Box 55181-83111, Maragheh, Iran
| | - Isabel García-Santos
- Departamento de Química Inorgánica, Facultad de Farmacia, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - Michael Pittelkow
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Ennio Zangrando
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy
| | - Maria G Babashkina
- Advanced Materials for Industry and Biomedicine Laboratory, Kurgan State University, Sovetskaya Str. 63/4, 640020 Kurgan, Russian Federation
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, Crta de Valldemossa km 7.5, 07122 Palma de Mallorca, Spain
| | - Damir A Safin
- Advanced Materials for Industry and Biomedicine Laboratory, Kurgan State University, Sovetskaya Str. 63/4, 640020 Kurgan, Russian Federation
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Faisal AG, Hassan QMA, Alsalim TA, Sultan HA, Kamounah FS, Emshary CA. Synthesis, optical nonlinear properties, and all‐optical switching of curcumin analogues. J PHYS ORG CHEM 2022. [DOI: 10.1002/poc.4401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ayman G. Faisal
- Department of Applied Marine Sciences, College of Marine Sciences University of Basrah Basrah Iraq
| | - Qusay M. A. Hassan
- Department of Physics, College of Education for Pure Sciences University of Basrah Basrah Iraq
| | - Tahseen A. Alsalim
- Department of Chemistry, College of Education for Pure Sciences University of Basrah Basrah Iraq
| | - H. A. Sultan
- Department of Physics, College of Education for Pure Sciences University of Basrah Basrah Iraq
| | | | - C. A. Emshary
- Department of Physics, College of Education for Pure Sciences University of Basrah Basrah Iraq
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13
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Hansen PE, Vakili M, Kamounah FS, Spanget-Larsen J. NH Stretching Frequencies of Intramolecularly Hydrogen-Bonded Systems: An Experimental and Theoretical Study. Molecules 2021; 26:molecules26247651. [PMID: 34946735 PMCID: PMC8706864 DOI: 10.3390/molecules26247651] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 11/12/2021] [Revised: 12/10/2021] [Accepted: 12/13/2021] [Indexed: 11/25/2022] Open
Abstract
The vibrational NH stretching transitions in secondary amines with intramolecular NH···O hydrogen bonds were investigated by experimental and theoretical methods, considering a large number of compounds and covering a wide range of stretching wavenumbers. The assignment of the NH stretching transitions in the experimental IR spectra was, in several instances, supported by measurement of the corresponding ND wavenumbers and by correlation with the observed NH proton chemical shifts. The observed wavenumbers were correlated with theoretical wavenumbers predicted with B3LYP density functional theory, using the basis sets 6-311++G(d,p) and 6-31G(d) and considering the harmonic as well as the anharmonic VPT2 approximation. Excellent correlations were established between observed wavenumbers and calculated harmonic values. However, the correlations were non-linear, in contrast to the results of previous investigations of the corresponding OH···O systems. The anharmonic VPT2 wavenumbers were found to be linearly related to the corresponding harmonic values. The results provide correlation equations for the prediction of NH stretching bands on the basis of standard B3LYP/6-311++G(d,p) and B3LYP/6-31G(d) harmonic analyses, with standard deviations close to 38 cm−1. This is significant because the full anharmonic VPT2 analysis tends to be impractical for large molecules, requiring orders of magnitude more computing time than the harmonic analysis.
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Affiliation(s)
- Poul Erik Hansen
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
- Correspondence: (P.E.H.); (J.S.-L.); Tel.: +45-4674-2432 (P.E.H.); +45-4674-2710 (J.S.-L.)
| | - Mohammad Vakili
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 91775-1436, Iran;
| | - Fadhil S. Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark;
| | - Jens Spanget-Larsen
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
- Correspondence: (P.E.H.); (J.S.-L.); Tel.: +45-4674-2432 (P.E.H.); +45-4674-2710 (J.S.-L.)
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14
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Abstract
Transamidation reactions are often mediated by reactive substrates in the presence of overstoichiometric activating reagents and/or transition metal catalysts. Here we report the use of CO2 as a traceless catalyst: in the presence of catalytic amounts of CO2, transamidation reactions were accelerated with primary, secondary, and tertiary amide donors. Various amine nucleophiles including amino acid derivatives were tolerated, showcasing the utility of transamidation in peptide modification and polymer degradation (e.g., Nylon-6,6). In particular, N,O-dimethylhydroxyl amides (Weinreb amides) displayed a distinct reactivity in the CO2-catalyzed transamidation versus a N2 atmosphere. Comparative Hammett studies and kinetic analysis were conducted to elucidate the catalytic activation mechanism of molecular CO2, which was supported by DFT calculations. We attributed the positive effect of CO2 in the transamidation reaction to the stabilization of tetrahedral intermediates by covalent binding to the electrophilic CO2.
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Affiliation(s)
- Yang Yang
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen Ø 2100, Denmark
| | - Jian Liu
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen Ø 2100, Denmark
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen Ø 2100, Denmark
| | - Gianluca Ciancaleoni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy.,CIRCC, via Celso Ulpiani 27, I-70126 Bari, Italy
| | - Ji-Woong Lee
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen Ø 2100, Denmark.,Nanoscience Center, University of Copenhagen, Universitetsparken 5, Copenhagen Ø 2100, Denmark
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15
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Kurutos A, Kamounah FS, Dobrikov GM, Pittelkow M, Sauer SPA, Hansen PE. Azo-hydrazone molecular switches: Synthesis and NMR conformational investigation. Magn Reson Chem 2021; 59:1116-1125. [PMID: 33860564 DOI: 10.1002/mrc.5164] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 04/05/2021] [Accepted: 04/10/2021] [Indexed: 06/12/2023]
Abstract
A series of five intramolecularly hydrogen-bonded arylhydrazone (aryl = phenol, p-nitrophenol, anisole, quinoline) derived molecular switches have been synthesized and characterized by NMR and HRMS techniques. It was found that the compounds exist as different isomers in solution. An investigation of both conformational and/or configurational changes of the azo-hydrazone compounds was carried out by 1D 1 H- and 13 C- spectra, 2D NOESY, COSY, HSQC, and HMBC techniques. It was found that these stimuli-responsive molecular switches exist mainly in the E form by intramolecularly hydrogen bonded between NH and the pyridine nitrogen at equilibrium. Deprotonation of the neutral E form yields the E' deprotonated isomer. Prediction of 13 C-NMR chemical shifts was achieved by DFT quantum mechanical calculations. Anions have traditionally been difficult to calculate correctly, so calculations of the anion using different functionals, basis sets, and solvent effects are also included. Deuterium isotope effects on the 13 C-NMR chemical shifts were employed in the assignments and furthermore utilized as indicators of intramolecular hydrogen bonding. Studies in various organic solvents including CDCl3 , CD3 CN, and DMSO-d6 were also performed aiming to monitor dynamic changes over several days. The effect of the hydrogen bonded solvents leads to Z forms.
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Affiliation(s)
- Atanas Kurutos
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str., bl. 9, Sofia, 1113, Bulgaria
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen Ø, DK-2100, Denmark
| | - Georgi M Dobrikov
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str., bl. 9, Sofia, 1113, Bulgaria
| | - Michael Pittelkow
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen Ø, DK-2100, Denmark
| | - Stephan P A Sauer
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen Ø, DK-2100, Denmark
| | - Poul Erik Hansen
- Department of Science and Environment, Roskilde University, Roskilde, DK-4000, Denmark
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16
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Darugar V, Vakili M, Tayyari SF, Hansen PE, Kamounah FS. Molecular structure, intramolecular hydrogen bond strength, vibrational assignment, and spectroscopic insight of 4-phenylamino-3-penten-2-one and its derivatives: A theoretical and experimental study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Pedersen SK, Pedersen VBR, Kamounah FS, Broløs LM, Baryshnikov GV, Valiev RR, Ivaniuk K, Stakhira P, Minaev B, Karaush-Karmazin N, Ågren H, Pittelkow M. Dianthracenylazatrioxa[8]circulene: Synthesis, Characterization and Application in OLEDs. Chemistry 2021; 27:11609-11617. [PMID: 33899273 DOI: 10.1002/chem.202100090] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 01/09/2021] [Indexed: 11/11/2022]
Abstract
A soluble, green-blue fluorescent, π-extended azatrioxa[8]circulene was synthesized by oxidative condensation of a 3,6-dihydroxycarbazole and 1,4-anthraquinone by using benzofuran scaffolding. This is the first circulene to incorporate anthracene within its carbon framework. Solvent-dependent fluorescence and bright green electroluminescence accompanied by excimer emission are the key optical properties of this material. The presence of sliding π-stacked columns in the single crystal of dianthracenylazatrioxa[8]circulene is found to cause a very high electron-hopping rate, thus making this material a promising n-type organic semiconductor with an electron mobility predicted to be around 2.26 cm2 V-1 s-1 . The best organic light-emitting diode (OLED) device based on the dianthracenylazatrioxa[8]circulene fluorescent emitter has a brightness of around 16 000 Cd m-2 and an external quantum efficiency of 3.3 %. Quantum dot-based OLEDs were fabricated by using dianthracenylazatrioxa[8]circulene as a host matrix material.
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Affiliation(s)
- Stephan K Pedersen
- Department of Chemistry, University of Copenhagen Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Viktor B R Pedersen
- Department of Chemistry, University of Copenhagen Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Line M Broløs
- Department of Chemistry, University of Copenhagen Universitetsparken 5, 2100, Copenhagen Ø, Denmark
| | - Glib V Baryshnikov
- Division of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health KTH Royal Institute of Technology, 10691, Stockholm, Sweden.,Tomsk State University, 36 Lenin Avenue, Tomsk, 634050, Russia
| | - Rashid R Valiev
- Tomsk State University, 36 Lenin Avenue, Tomsk, 634050, Russia.,Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtanens plats 1), 00014, Helsinki, Finland
| | - Khrystyna Ivaniuk
- Lviv Polytechnic National University S. Bandera 12, 79013, Lviv, Ukraine
| | - Pavlo Stakhira
- Lviv Polytechnic National University S. Bandera 12, 79013, Lviv, Ukraine
| | - Boris Minaev
- Department of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, 18031, Cherkasy, Ukraine
| | - Nataliya Karaush-Karmazin
- Department of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, 18031, Cherkasy, Ukraine
| | - Hans Ågren
- College of Chemistry and Chemical Engineering, Henan University Kaifeng, Henan, 475004, P.R. China.,Department of Physics and Astronomy, Uppsala University, 752 36, Uppsala, Sweden
| | - Michael Pittelkow
- Department of Chemistry, University of Copenhagen Universitetsparken 5, 2100, Copenhagen Ø, Denmark
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18
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Darugar V, Vakili M, Tayyari SF, Kamounah FS. Validation of potential energy distribution by VEDA in vibrational assignment some of β-diketones; comparison of theoretical predictions and experimental vibration shifts upon deutration. J Mol Graph Model 2021; 107:107976. [PMID: 34192656 DOI: 10.1016/j.jmgm.2021.107976] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 12/07/2020] [Revised: 06/20/2021] [Accepted: 06/22/2021] [Indexed: 11/27/2022]
Abstract
The harmonic vibrational frequencies of the cis-enol forms of some of β-diketones with different substitution in beta position, vis. H, CH3, and Ph ring, as the symmetric and asymmetric molecules, were calculated using density functional theory (DFT) at the B3LYP/6-311++G(d,p) level of theory. The results of DFT calculations were used to obtain the potential energy distribution (PED) by VEDA software. The PED results compared with the Gauss View animation, as our reassignments, and the experimental IR shifts upon deuteration of hydrogen in the OH and CHα. According to our study, the PED contributions, Gauss View animation and observed shifts show similar results for most of the bands which are not coupled with the OH and/or CHα bending, such as asymmetric and symmetric CH3 stretching and in-plane deformations, CH3 rocking vibrations and 8a, 19b, 9a, 15, 18a, and 12 motions of the phenyl ring. The largest discrepancies were observed in the 1700-1000 cm-1 region, likely due to the coupling with the OH and CHα in-plane bending vibrations, such as νaC = C-C = Ο, νsC = C-C = Ο and δOH. Furthermore, the calculated PED contributions by VEDA software do not well define the vibrational contributions to those groups in the molecule that are directly involved in the intramolecular hydrogen bond and the observed failure of the VEDA procedure is possibly due to inappropriateness of the default options.
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Affiliation(s)
- Vahidreza Darugar
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Iran
| | - Mohammad Vakili
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Iran.
| | | | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen Ø, Denmark
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19
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Bamigboye C, Abbo HS, Kwong HC, Tan SL, Tiekink ER, Kamounah FS, Titinchi SJ. Crystal structure analysis and supramolecular association in ethyl N-[amino(iminio)methyl]carbamate dichloride hemi-hydrate. Z KRIST-CRYST MATER 2021. [DOI: 10.1515/zkri-2021-2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
X-ray crystallography on [EtOC(=O)N(H)C(=N+H2)NH2]Cl·½H2O (1) shows the asymmetric unit to comprise two independent cations, two chloride anions and crystal water. The main conformational difference between the cations is seen in the relative orientation of the ethyl groups; geometry-optimisation confirms the all-trans conformation is the most stable. The remaining parts of the cations are co-planar and feature intramolecular N–H···O(carbonyl) hydrogen bonds. An analysis of the C–N bonds suggests substantial delocalisation of the positive charge over the CN3 atoms. In the crystal, columns comprising the first independent cation are surrounded by four columns of the second cation within a network of water-O–H···Cl, N–H···Cl and N–H···O(water, carbonyl) hydrogen bonds, many of which are charge-assisted. The packing has been further investigated by Hirshfeld surface analysis, molecular electrostatic potential and interaction energy calculations. The charge-assisted N–H···Cl hydrogen bonds are significantly stronger than the water-O–H···Cl interactions consistent the distribution of the positive charge over the CN3 atoms.
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Affiliation(s)
- Christiana Bamigboye
- Department of Chemistry , University of the Western Cape , Cape Town , South Africa
| | - Hanna S. Abbo
- Department of Chemistry , University of the Western Cape , Cape Town , South Africa
- Department of Chemistry , College of Science, University of Basrah , Basrah , Iraq
| | - Huey Chong Kwong
- Research Centre for Crystalline Materials, School of Medical and Life Sciences, Sunway University , 47500 Bandar Sunway , Selangor Darul Ehsan , Malaysia
| | - Sang Loon Tan
- Research Centre for Crystalline Materials, School of Medical and Life Sciences, Sunway University , 47500 Bandar Sunway , Selangor Darul Ehsan , Malaysia
| | - Edward R.T. Tiekink
- Research Centre for Crystalline Materials, School of Medical and Life Sciences, Sunway University , 47500 Bandar Sunway , Selangor Darul Ehsan , Malaysia
| | - Fadhil S. Kamounah
- Department of Chemistry , University of Copenhagen , Universitetsparken 5, 2100 Copenhagen Ø , Denmark
| | - Salam J.J. Titinchi
- Department of Chemistry , University of the Western Cape , Cape Town , South Africa
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20
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Ozma MA, Khodadadi E, Rezaee MA, Kamounah FS, Asgharzadeh M, Ganbarov K, Aghazadeh M, Yousefi M, Pirzadeh T, Kafil HS. Induction of proteome changes involved in biofilm formation of Enterococcus faecalis in response to gentamicin. Microb Pathog 2021; 157:105003. [PMID: 34087388 DOI: 10.1016/j.micpath.2021.105003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 04/08/2021] [Revised: 05/18/2021] [Accepted: 05/19/2021] [Indexed: 10/21/2022]
Abstract
BACKGROUND Enterococcus faecalis is a significant cause of nosocomial infections and other diseases, including endocarditis, bacteremia, and urinary tract infections. This microorganism forms biofilms to overcome difficult environmental conditions, such as lack of oxygen, lack of water, and the presence of antimicrobials. These biofilms make diseases difficult by changing their proteome contents, protecting the bacterium, and increasing their pathogenicity. This study aimed to evaluate gentamicin's effect on proteome changes and biofilm formation in E. faecalis. METHOD Twenty-five clinical isolates and one standard isolate were selected for the experiments. A label-free/gel-free proteomic and microtiter plate techniques were used to study proteome changes and biofilm formation, respectively. RESULTS Gentamicin significantly increased the biofilm formation in 62% of isolates and the rest of the isolates; no significant change was observed. The abundance of lactate utilization protein C, ribosomal RNA small subunit methyltransferase H, and protein translocase subunit SecA were increased. However, the abundances of proteins effective in cell division and metabolism, such as replication initiation protein and segregation and condensation protein A, were decreased. CONCLUSION The present study's findings exhibited that antibiotics might have adverse effects on treatment and increase microorganisms' pathogenicity. It was observed in gentamicin as induction of biofilm formation through different mechanisms, particularly changes in the expression of specific proteins in E. faecalis.
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Affiliation(s)
- Mahdi Asghari Ozma
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ehsaneh Khodadadi
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK- 2100, Copenhagen, Denmark
| | - Mohammad Asgharzadeh
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Mohammad Aghazadeh
- Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mehdi Yousefi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Tahereh Pirzadeh
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hossein Samadi Kafil
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
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21
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Kurutos A, Nikodinovic-Runic J, Veselinovic A, Veselinović JB, Kamounah FS, Ilic-Tomic T. RNA-targeting low-molecular-weight fluorophores for nucleoli staining: synthesis, in silico modelling and cellular imaging. NEW J CHEM 2021. [DOI: 10.1039/d1nj01659h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Herein we present our work on the synthesis, investigation of the photophysical properties, interactions with nucleic acids, molecular docking, and imaging application of three carbocyanine dyes.
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Affiliation(s)
- Atanas Kurutos
- Institute of Organic Chemistry with Centre of Phytochemistry
- Bulgarian Academy of Sciences
- 1113 Sofia
- Bulgaria
| | | | | | - Jovana B. Veselinović
- Institute of Molecular Genetics and Genetic Engineering
- University of Belgrade
- 11000 Belgrade
- Serbia
| | - Fadhil S. Kamounah
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen
- Denmark
| | - Tatjana Ilic-Tomic
- Institute of Molecular Genetics and Genetic Engineering
- University of Belgrade
- 11000 Belgrade
- Serbia
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22
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23
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Khanmohammadi S, Karimian R, Ghanbari Mehrabani M, Mehramuz B, Ganbarov K, Ejlali L, Tanomand A, Kamounah FS, Ahangarzadeh Rezaee M, Yousefi M, Sheykhsaran E, Samadi Kafil H. Poly (ε-Caprolactone)/Cellulose Nanofiber Blend Nanocomposites Containing ZrO2 Nanoparticles: A New Biocompatible Wound Dressing Bandage with Antimicrobial Activity. Adv Pharm Bull 2020; 10:577-585. [PMID: 33072535 PMCID: PMC7539316 DOI: 10.34172/apb.2020.069] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 06/17/2019] [Revised: 04/15/2020] [Accepted: 04/19/2020] [Indexed: 11/09/2022] Open
Abstract
Purpose: In the present study, the poly (ε-caprolactone)/cellulose nanofiber containing ZrO2 nanoparticles (PCL/CNF/ZrO2 ) nanocomposite was synthesized for wound dressing bandage with antimicrobial activity. Methods: PCL/CNF/ZrO2 nanocomposite was synthesized in three different zirconium dioxide amount (0.5, 1, 2%). Also the prepared nanocomposites were characterized by Infrared spectroscopy (FT-IR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). In addition, the morphology of the samples was observed by scanning electron microscopy (SEM). Results: Analysis of the XRD spectra showed a preserved structure for PCL semi-crystalline in nanocomposites and an increase in the concentrations of ZrO2 nanoparticles, the structure of nanocomposite was amorphous as well. The results of TGA, DTA, DSC showed thermal stability and strength properties for the nanocomposites which were more thermal stable and thermal integrate compared to PCL. The contact angles of the nanocomposites narrowed as the amount of ZrO2 in the structure increased. The evaluation of biological activities showed that the PCL/CNF/ZrO2 nanocomposite with various concentrations of ZrO2 nanoparticles exhibited moderate to good antimicrobial activity against all tested bacterial and fungal strains. Furthermore, cytocompatibility of the scaffolds was assessed by MTT assay and cell viability studies proved the non-toxic nature of the nanocomposites. Conclusion: The results show that the biodegradability of nanocomposite has advantages that can be used as wound dressing.
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Affiliation(s)
- Sina Khanmohammadi
- Faculty of Chemistry, Department of Organic Chemistry, Azad University of Tabriz, Tabriz, Iran.,Chemical Injuries Research Center, Systems biology and poisonings institute, Baqiyatallah University of Medical Sciences, Tehran, Iran.,Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ramin Karimian
- Chemical Injuries Research Center, Systems biology and poisonings institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | | | - Bahareh Mehramuz
- Connective Tissues Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Khudaverdi Ganbarov
- Department of Microbiology, Baku State University, Baku, Republic of Azerbaijan
| | - Ladan Ejlali
- Faculty of Chemistry, Department of Organic Chemistry, Azad University of Tabriz, Tabriz, Iran
| | - Asghar Tanomand
- Department of Basic Sciences, Faculty of Medicine, Maragheh University of Medical Sciences, Maragheh, Iran
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | | | - Mehdi Yousefi
- Stem Cell and Regenerative Medicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Elham Sheykhsaran
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hossein Samadi Kafil
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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24
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Khodadadi E, Zeinalzadeh E, Taghizadeh S, Mehramouz B, Kamounah FS, Khodadadi E, Ganbarov K, Yousefi B, Bastami M, Kafil HS. Proteomic Applications in Antimicrobial Resistance and Clinical Microbiology Studies. Infect Drug Resist 2020; 13:1785-1806. [PMID: 32606829 PMCID: PMC7305820 DOI: 10.2147/idr.s238446] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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: 11/13/2019] [Accepted: 05/23/2020] [Indexed: 12/11/2022] Open
Abstract
Sequences of the genomes of all-important bacterial pathogens of man, plants, and animals have been completed. Still, it is not enough to achieve complete information of all the mechanisms controlling the biological processes of an organism. Along with all advances in different proteomics technologies, proteomics has completed our knowledge of biological processes all around the world. Proteomics is a valuable technique to explain the complement of proteins in any organism. One of the fields that has been notably benefited from other systems approaches is bacterial pathogenesis. An emerging field is to use proteomics to examine the infectious agents in terms of, among many, the response the host and pathogen to the infection process, which leads to a deeper knowledge of the mechanisms of bacterial virulence. This trend also enables us to identify quantitative measurements for proteins extracted from microorganisms. The present review study is an attempt to summarize a variety of different proteomic techniques and advances. The significant applications in bacterial pathogenesis studies are also covered. Moreover, the areas where proteomics may lead the future studies are introduced.
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Affiliation(s)
- Ehsaneh Khodadadi
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Elham Zeinalzadeh
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.,Hematology and Oncology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sepehr Taghizadeh
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Bahareh Mehramouz
- Hematology and Oncology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Copenhagen, DK 2100, Denmark
| | - Ehsan Khodadadi
- Department of Biology, Tabriz Branch, Islamic Azad University, Tabriz, Iran
| | | | - Bahman Yousefi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Milad Bastami
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hossein Samadi Kafil
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
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Elias RS, Saeed BA, Kamounah FS, Duus F, Hansen PE. Strong intramolecular hydrogen bonds and steric effects involving C═S groups: An NMR and computational study. Magn Reson Chem 2020; 58:154-162. [PMID: 31705583 DOI: 10.1002/mrc.4959] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Revised: 10/17/2019] [Accepted: 10/17/2019] [Indexed: 06/10/2023]
Abstract
A number of 5-acyl rhodanines and thiorhodanines with bulky acyl groups (pivaloyl and adamantoyl), not previously available, have been synthesized. The compounds are shown to exist in the enol form. Structures have been calculated using both the MP2 approach and the B3LYP-GD3BJ functional and the 6-311++G(d,p) basis set. Hydrogen bond energies are estimated by subtracting energies of a structure with the OH group turned 180° from those of the intramolecularly hydrogen-bonded one. Properties such as OH chemical shifts, two-bond isotope effects on 13 C chemical shifts, electron densities at the bond critical point from atoms in molecules analysis, and the hydrogen bond energies show that the sterically hindered compounds have stronger hydrogen bonds than methyl or isopropyl derivatives. The combination of oxygen and sulfur derivatives enables a detailed analysis of hydrogen bond energies.
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Affiliation(s)
- Rita S Elias
- Department of Pharmaceutical Chemistry, College of Pharmacy, University of Basrah, Basrah, Iraq
| | - Bahjat A Saeed
- Department of Chemistry, College of Education for Pure Sciences, University of Basrah, Basrah, Iraq
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen, Denmark
| | - Fritz Duus
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000, Roskilde, Denmark
| | - Poul Erik Hansen
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000, Roskilde, Denmark
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Karimi N, Ghanbarzadeh B, Hajibonabi F, Hojabri Z, Ganbarov K, Kafil HS, Hamishehkar H, Yousefi M, Mokarram RR, Kamounah FS, Yousefi B, Moaddab SR. Turmeric extract loaded nanoliposome as a potential antioxidant and antimicrobial nanocarrier for food applications. FOOD BIOSCI 2019. [DOI: 10.1016/j.fbio.2019.04.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Ahmadi R, Tanomand A, Kazeminava F, Kamounah FS, Ayaseh A, Ganbarov K, Yousefi M, Katourani A, Yousefi B, Kafil HS. Fabrication and characterization of a titanium dioxide (TiO 2) nanoparticles reinforced bio-nanocomposite containing Miswak ( Salvadora persica L.) extract - the antimicrobial, thermo-physical and barrier properties. Int J Nanomedicine 2019; 14:3439-3454. [PMID: 31190802 PMCID: PMC6522844 DOI: 10.2147/ijn.s201626] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [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: 01/15/2019] [Accepted: 03/27/2019] [Indexed: 12/19/2022] Open
Abstract
Objective: The microbial, physico-chemical and optical corruptions threaten a variety of foods and drugs and consequently the human biological safety and its accessible resources. The humanbeing's tendency towards bio-based materials and natural plant-extracts led to an increase in the usage of antimicrobial biocomposites based on medicinal herbs. Miswak (Salvadora persica L.) extract (SPE) has been proved effective for its antimicrobial and other biological activities. Therefore, in this study, titanium dioxide (TiO2) nanoparticles (TONP) and SPE were applied to fabricate antimicrobial carboxymethyl cellulose (Na-CMC) based bio-nanocomposites which would simultaneously promote some thermo-physical and barrier properties. Methods: CMC-neat film (C1), CMC/TONP-2% (C2) and CMC/TONP-2% with 150, 300 and 450 mg/mL SPE (SPE150, SPE30 and SPE450, respectively) were fabricated. The physical and mechanical properties; elemental mapping analysis (MAP), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravimetric analysis (TGA-DTG); fourier transform infrared (FTIR), energy-dispersive X-ray (EDX) and UV-vis spectroscopies were done to further validate the results. Results: Addition of TONP (2%) improved the blocking of UV light at 280 nm while SPE-containing nanocomposites completely blocked it. FTIR, XRD and SEM confirmed the formation of homogeneous films and high miscibility of applied materials. TONP led to an increase in Young's modulus (YM) and stress at break (SB) while SPE decreased them and enhanced the elongation to break (EB) (flexibility) of the active nanocomposites. Compared to CMC-film, the thermo-gravimetric analysis (TGA-DTG) showed a higher thermal stability for CMC/TONP and CMC/TONP/SPE nanocomposites. The EDX spectroscopy and elemental mapping analysis (MAP) proved the existence and well-distributedness of Na, K, Cl, S, Ti, F and N elements in SPE-activated nanocomposites. The pure SPE and SPE-activated nanocomposites showed a favorable antimicrobial activity against both gram-positive (Staphylococcus aureus) and negative (Escherichia coli) bacteria. Conclusion: The CMC-TiO2-SPE nanocomposites were homogeneously produced. Combination of TiO2 nanoparticles and dose-dependent SPE led to an improvement of thermal stability, and high potential in antimicrobial and UV-barrier properties. These results can generally highlight the role of the fabricated antimicrobial bio-nanocomposites as a based for different applications especially in food/drug packaging or coating.
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Affiliation(s)
- Raman Ahmadi
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Asghar Tanomand
- Department of Basic Sciences, Maragheh University of Medical Sciences, Maragheh, Iran
| | - Fahimeh Kazeminava
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, DK- 2100 Copenhagen. Denmark
| | - Ali Ayaseh
- Department of Food Science and Technology, University of Tabriz, Tabriz, Iran
| | | | - Mehdi Yousefi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Adib Katourani
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Bahman Yousefi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hossein Samadi Kafil
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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Seyedkatouli S, Vakili M, Tayyari SF, Hansen PE, Kamounah FS. Molecular structure and intramolecular hydrogen bond strength of 3-methyl-4-amino-3-penten-2-one and its N Me and N-Ph substitutions by experimental and theoretical methods. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.02.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Rahimi M, Karimian R, Noruzi EB, Ganbarov K, Zarei M, Kamounah FS, Yousefi B, Bastami M, Yousefi M, Samadi Kafil H. Needle-shaped amphoteric calix[4]arene as a magnetic nanocarrier for simultaneous delivery of anticancer drugs to the breast cancer cells. Int J Nanomedicine 2019; 14:2619-2636. [PMID: 31043778 PMCID: PMC6472283 DOI: 10.2147/ijn.s194596] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Chemotherapy as an important tool for cancer treatment faces many obstacles such as multidrug resistance and adverse toxic effects on healthy tissues. Drug delivery systems has opened a new window to overcome these problems. There has been a strong interest development of new platform and system for delivof chemotherapeutic agents. PURPOSE In the present study, a green synthesis method was chosen and performed for preparation of a novel amphoteric calix[4]arene (Calix) macrocycle with low toxicity to the human body. MATERIALS AND METHODS The amphoteric Calix was coated on the surface of Fe3O4 magnetic nanoparticles and used as a magnetic nanocarrier for simultaneous delivery of two anticancer agents, doxorubicin and methotrexate, against MCF7 cancer cells. Several chemical characterizations were done for validation of prepared nanocarrier, and in vitro loading and release studies of drugs were performed with good encapsulation efficiency. RESULTS In vitro biological studies including hemolysis assay, erythrocytes sedimentation rate, red blood cells aggregation, cyto cellular internalization, and apoptosis evaluations were performed. Based on results, the developed nanocarrier has many advantages and capability for an efficient codelivery of DOX and MTX, which has a highly potent ability to kill cancer cells. CONCLUSION All these results persuade us, this nanocarrier could be effectively used for cancer therapy of MCF7 breast cancer cells and is suitable for use in further animal studies in future investigations.
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Affiliation(s)
- Mahdi Rahimi
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran,
| | - Ramin Karimian
- Chemical Injuries Research Center, Systems biology and poisonings institute, Baqiyatallah University of Medical Sciences, Tehran, Iran,
| | - Ehsan Bahojb Noruzi
- Faculty of Chemistry, Department of Inorganic Chemistry, University of Tabriz, Tabriz, Iran
| | - Khudaverdi Ganbarov
- Department of Microbiology, Baku State University, Baku, Republic of Azerbaijan
| | - Mojtaba Zarei
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran,
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Copenhagen. Denmark
| | - Bahman Yousefi
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran,
| | - Milad Bastami
- Biotechnology Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mehdi Yousefi
- Stem Cell Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hossein Samadi Kafil
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran,
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Lacerda EG, Kamounah FS, Coutinho K, Sauer SPA, Hansen PE, Hammerich O. Computational Prediction of 1 H and 13 C NMR Chemical Shifts for Protonated Alkylpyrroles: Electron Correlation and Not Solvation is the Salvation. Chemphyschem 2018; 20:78-91. [PMID: 30452112 DOI: 10.1002/cphc.201801066] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [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: 11/15/2018] [Indexed: 12/18/2022]
Abstract
Prediction of chemical shifts in organic cations is known to be a challenge. In this article we meet this challenge for α-protonated alkylpyrroles, a class of compounds not yet studied in this context, and present a combined experimental and theoretical study of the 13 C and 1 H chemical shifts in three selected pyrroles. We have investigated the importance of the solvation model, basis set, and quantum chemical method with the goal of developing a simple computational protocol, which allows prediction of 13 C and 1 H chemical shifts with sufficient accuracy for identifying such compounds in mixtures. We find that density functional theory with the B3LYP functional is not sufficient for reproducing all 13 C chemical shifts, whereas already the simplest correlated wave function model, Møller-Plesset perturbation theory (MP2), leads to almost perfect agreement with the experimental data. Treatment of solvent effects generally improves the agreement with experiment to some extent and can in most cases be accomplished by a simple polarizable continuum model. The only exception is the NH proton, which requires inclusion of explicit solvent molecules in the calculation.
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Affiliation(s)
- Evanildo G Lacerda
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen, Denmark.,Instituto de Física da Universidade de São Paulo, CP 66318, 05314-970, São Paulo, SP, Brazil
| | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen, Denmark.,Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000, Roskilde, Denmark
| | - Kaline Coutinho
- Instituto de Física da Universidade de São Paulo, CP 66318, 05314-970, São Paulo, SP, Brazil
| | - Stephan P A Sauer
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen, Denmark
| | - Poul Erik Hansen
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000, Roskilde, Denmark
| | - Ole Hammerich
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen, Denmark
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31
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Nguyen HGT, Nguyen VN, Kamounah FS, Hansen PE. Structure of a new usnic acid derivative from a deacylating Mannich reaction: NMR studies supported by theoretical calculations of chemical shifts. Magn Reson Chem 2018; 56:1094-1100. [PMID: 29920769 DOI: 10.1002/mrc.4760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 05/31/2018] [Accepted: 06/03/2018] [Indexed: 06/08/2023]
Abstract
In a conventional Mannich reaction using piperidine, hydroxypiperidines, morpholine, and N-methylpiperazine with usnic acid, a deacetylation was observed resulting in a substitution at C-2, a loss of an acetyl group, and a Mannich base with a stabilized enol. The enol has a hydrogen bond to the nitrogen of the secondary amine. The structure was investigated by nuclear magnetic resonance and deuterium isotope effects on 13 C chemical shifts as well as with density functional theory calculations to study the changed hydrogen bond pattern. It was found that the hydrogen bond involving the OH-9 group in chloroform forms a strong hydrogen bond than in usnic acid itself and that this hydrogen bond becomes even stronger in the more polar solvent, dimethylsulfoxide. Tautomerism was observed in the Mannich base as demonstrated by deuterium isotope effects on chemical shifts. The position of the tautomeric equilibrium depends on the solvent, and the position of the equilibrium governs the strength of the OH-9…O═C hydrogen bond.
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Affiliation(s)
| | | | - Fadhil S Kamounah
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
| | - Poul Erik Hansen
- Department of Science and Environment, Roskilde University, Roskilde, Denmark
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32
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Saeed BA, Elias RS, Kamounah FS, Hansen PE. NMR, MP2, and DFT study of thiophenoxyketenimines (o-thio-Schiff bases): Determination of the preferred form. Magn Reson Chem 2018; 56:172-182. [PMID: 29117625 DOI: 10.1002/mrc.4677] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 10/22/2017] [Accepted: 10/24/2017] [Indexed: 06/07/2023]
Abstract
Five new thiophenoxyketinimines have been synthesized. 1 H and 13 C NMR spectra as well as deuterium isotope effects on 13 C chemical shifts are determined, and spectra are assigned. DFT and MP2 calculations of both structures, chemical shifts, and isotope effects on chemical shifts are done. The combined analysis reveals that the compounds are primarily on a zwitterionic form with an NH+ and a S- group and with a little of the neutral form mixed in. Very strong intramolecular hydrogen bonding is found and very high NH chemical shifts are observed. The theoretical calculations show that calculations at the MP2 level are best to obtain correct "C═S" chemical shifts.
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Affiliation(s)
- Bahjat A Saeed
- Department of Chemistry, College of Education for Pure Sciences, University of Basrah, Basrah, Iraq
| | - Rita S Elias
- Department of Pharmaceutical Chemistry, College of Pharmacy, University of Basrah, Basrah, Iraq
| | - Fadhil S Kamounah
- Department of Science and Environment, Roskilde University, Roskilde, Denmark
| | - Poul Erik Hansen
- Department of Science and Environment, Roskilde University, Roskilde, Denmark
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Marciniak H, Hristova S, Deneva V, Kamounah FS, Hansen PE, Lochbrunner S, Antonov L. Dynamics of excited state proton transfer in nitro substituted 10-hydroxybenzo[h]quinolines. Phys Chem Chem Phys 2018; 19:26621-26629. [PMID: 28953273 DOI: 10.1039/c7cp04476c] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The ground state tautomerism and excited state intramolecular proton transfer (ESIPT) of 10-hydroxybenzo[h]quinoline (HBQ) and its nitro derivatives, 7-nitrobenzo[h]quinolin-10-ol (2) and 7,9-dinitrobenzo[h]quinolin-10-ol (3), have been studied in acetonitrile using steady state as well as time dependent spectroscopy and quantum-chemical calculations. In addition to the enol form absorbance in the range 360-390 nm, the absorption spectra of 2 and 3 exhibit a red shifted band at ∼450 nm. Chemometric data processing, based on individual band decomposition, allowed us to estimate the position of the ground state enol-keto tautomeric equilibrium (ΔG values of 1.03 and 0.62 kcal mol-1 respectively for 2 and 3). The fluorescence stems from the keto form even if the enol form is optically excited as proven by the shape of the excitation spectra indicating that ESIPT takes place. The Stokes shift of the substituted compounds is substantially lower compared to HBQ, which follows from the fact that the substitution occurs in the formal cyclohexa-2,4-dienone moiety and leads to a decrease of the HOMO level of the keto tautomer. The pump-probe experiments show that in the nitro substituted HBQs 2 and 3 ESIPT occurs with a time constant of 0.89 ps and 0.68 ps, respectively. In both cases a mixture of the enol and proton transfer forms is optically excited. The enol form exhibits then the ESIPT and subsequently both fractions take the same relaxation path. We propose that in 2 and 3 the ESIPT path exhibits a potential energy barrier resulting in an incoherent rate governed process while in HBQ the ESIPT proceeds as a ballistic wavepacket motion along a path without significant barriers. The theoretical calculations (M06-2X/TZVP) confirm the existence of a barrier in the ground and excited states as result of the substitution.
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Affiliation(s)
- H Marciniak
- Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23-24, 18059 Rostock, Germany
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Manolova Y, Marciniak H, Tschierlei S, Fennel F, Kamounah FS, Lochbrunner S, Antonov L. Solvent control of intramolecular proton transfer: is 4-hydroxy-3-(piperidin-1-ylmethyl)-1-naphthaldehyde a proton crane? Phys Chem Chem Phys 2018; 19:7316-7325. [PMID: 28239718 DOI: 10.1039/c7cp00220c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The solvent dependent excited state dynamics of 4-hydroxy-3-(piperidin-1-ylmethyl)-1-naphthaldehyde (compound 2), a candidate for a molecular switch based on intramolecular proton transfer, was investigated by ultrafast spectroscopy and quantum-chemical calculations. In acetonitrile a mixture of molecules in the enol and zwitterionic proton transfer (PT) form exists in the ground state. However, the zwitterion is the energetically favored one in the electronically excited state. Optical excitation of the enol form results in intramolecular proton transfer and formation of the PT form within 1.4 ps. In addition we observe the appearance of a long living species with a rate of 1/(330 ps) which returns to the original ground state on time scales beyond 2 ns and which is attributed to the triplet state. In toluene the enol form is the only observed ground state tautomer, but no light induced proton transfer occurs. Again the long living triplet state is formed, even with a faster rate of 1/(11 ps). In methanol hydrogen bonds between 2 and solvent molecules stabilize strongly the PT form in the ground as well as in the excited state. Also in this case no light induced intramolecular proton transfer was observed but the formation of a long living species was. However, its absorption spectrum is distinctly different from the triplet state seen in acetonitrile and methanol.
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Affiliation(s)
- Y Manolova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G.Bonchev str., bldg. 9, 1113 Sofia, Bulgaria.
| | - H Marciniak
- Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23-24, 18059 Rostock, Germany and Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - S Tschierlei
- Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23-24, 18059 Rostock, Germany and Institute of Inorganic Chemistry 1, University Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - F Fennel
- Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23-24, 18059 Rostock, Germany
| | - F S Kamounah
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - S Lochbrunner
- Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23-24, 18059 Rostock, Germany
| | - L Antonov
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G.Bonchev str., bldg. 9, 1113 Sofia, Bulgaria.
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Plesner M, Hensel T, Nielsen BE, Kamounah FS, Brock-Nannestad T, Nielsen CB, Tortzen CG, Hammerich O, Pittelkow M. Synthesis and properties of unsymmetrical azatrioxa[8]circulenes. Org Biomol Chem 2015; 13:5937-43. [DOI: 10.1039/c5ob00676g] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis and properties are reported for a series of unsymmetrical antiaromatic azatrioxa[8]circulenes.
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Affiliation(s)
- Malene Plesner
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
| | - Thomas Hensel
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
| | - Bjarne E. Nielsen
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
| | - Fadhil S. Kamounah
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
| | | | | | | | - Ole Hammerich
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
| | - Michael Pittelkow
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
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36
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Hansen PE, Kamounah FS, Zhiryakova D, Manolova Y, Antonov L. 1,1′,1′′-(2,4,6-Trihydroxybenzene-1,3,5-triyl)triethanone tautomerism revisited. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2013.11.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Hansen PE, Kamounah FS, Gryko DT. Deuterium isotope effects on ¹³C-NMR chemical shifts of 10-hydroxybenzo[h]quinolines. Molecules 2013; 18:4544-60. [PMID: 23595091 PMCID: PMC6269923 DOI: 10.3390/molecules18044544] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 04/09/2013] [Accepted: 04/15/2013] [Indexed: 11/16/2022] Open
Abstract
Deuterium isotope effects on ¹³C-NMR chemical shifts are investigated in a series of 10-hydroxybenzo[h]quinolines (HBQ's) The OH proton is deuteriated. The isotope effects on ¹³C chemical shifts in these hydrogen bonded systems are rather unusual. The formal four-bond effects are found to be negative, indicating transmission via the hydrogen bond. In addition unusual long-range effects are seen. Structures, NMR chemical shifts and changes in nuclear shieldings upon deuteriation are calculated using DFT methods. Two-bond deuterium isotope effects on 13C chemical shifts are correlated with calculated OH stretching frequencies. Isotope effects on chemical shifts are calculated for systems with OH exchanged by OD. Hydrogen bond potentials are discussed. New and more soluble nitro derivatives are synthesized.
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Affiliation(s)
- Poul Erik Hansen
- Department of Science, Systems and Models, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark; E-Mail:
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +45-4674-2432; Fax: +45-4674-3011
| | - Fadhil S. Kamounah
- Department of Science, Systems and Models, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark; E-Mail:
| | - Daniel T. Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland; E-Mail:
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Titinchi SJJ, Kamounah FS, Abbo HS, Hammerich O. A reactivity-selectivity study of the Friedel-Crafts acetylation of 3,3'-dimethylbiphenyl and the oxidation of the acetyl derivatives. Chem Cent J 2012; 6:52. [PMID: 22682296 PMCID: PMC3505176 DOI: 10.1186/1752-153x-6-52] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 02/25/2012] [Accepted: 05/08/2012] [Indexed: 11/26/2022] Open
Abstract
UNLABELLED BACKGROUND Friedel-Crafts acetylation is an important route to aromatic ketones, in research laboratories and in industry. The acetyl derivatives of 3,3'-dimethylbiphenyl (3,3'-dmbp) have applications in the field of liquid crystals and polymers and may be oxidized to the dicarboxylic acids and derivatives that are of interest in cancer treatment. FINDINGS The effect of solvent and temperature on the selectivity of monoacetylation of 3,3'-dmbp by the Perrier addition procedure was studied using stoichiometric amounts of reagents. 4-Ac-3,3'-dmbp was formed almost quantitatively in boiling 1,2-dichloroethane and this is almost twice the yield hitherto reported. Using instead a molar ratio of substrate:AcCl:AlCl3 equal to 1:4:4 or 1:6:6 in boiling 1,2-dichloroethane, acetylation afforded 4,4'- and 4,6'-diacetyl-3,3'-dmbp in a total yield close to 100%. The acetyl derivatives were subsequently converted to the carboxylic acids by hypochlorite oxidation. The relative stabilities of the isomeric products and the corresponding σ-complexes were studied by DFT calculations and the data indicated that mono- and diacetylation followed different mechanisms. CONCLUSIONS Friedel-Crafts acetylation of 3,3'-dmbp using the Perrier addition procedure in boiling 1,2-dichloroethane was found to be superior to other recipes. The discrimination against the 6-acetyl derivative during monoacetylation seems to reflect a mechanism including an AcCl:AlCl3 complex or larger agglomerates as the electrophile, whereas the less selective diacetylations of the deactivated 4-Ac-3,3'-dmbp are suggested to include the acetyl cation as the electrophile. The DFT data also showed that complexation of intermediates and products with AlCl3 does not seem to be important in determining the mechanism.
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Affiliation(s)
- Salam JJ Titinchi
- Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville, 7535, South Africa
| | - Fadhil S Kamounah
- CISMI, Department of Science, Systems and Models, Roskilde University, Universitetsvej 1, P.O. Box 260, Roskilde, DK-4000, Denmark
| | - Hanna S Abbo
- Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville, 7535, South Africa
| | - Ole Hammerich
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen Ø, DK-2100, Denmark
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Kamounah FS, Christensen P, Hansen PE. Acetyl cedrene and its follower. An Isotopic, NMR and MS Structure elucidation and deuteriation study. J Labelled Comp Radiopharm 2010. [DOI: 10.1002/jlcr.1830] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Moth-Poulsen K, Kofod-Hansen V, Kamounah FS, Hatzakis NS, Stamou D, Schaumburg K, Christensen JB. Optically induced linking of protein and nanoparticles to gold surfaces. Bioconjug Chem 2010; 21:1056-61. [PMID: 20491443 DOI: 10.1021/bc900561m] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Attachment of molecules and proteins to surfaces is of great interest for the development of a large variety of applications. We present herein a novel approach to efficiently couple a molecule of choice to biological building blocks. We synthesized and employed a new derivative of 5-bromo-7-nitroindoline to attach nucleophilic molecules and proteins to gold surfaces by photochemical activation. The reaction can be seen as a photoactivated alternative to the activated ester type chemistries that are commonly used to attach proteins or molecules to surfaces. We characterize the reaction by UV-vis and NMR spectroscopy, and as test of principle experiment, we show that we can attach proteins to surfaces and demonstrate that we can functionalize gold nanoparticles by this optically induced cross-linking reaction.
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Affiliation(s)
- Kasper Moth-Poulsen
- Nano-Science Center, Department of Chemistry, University of Copenhagen, Denmark
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Abstract
Alkylated hydroxyflavothiones, namely flavothione, 5-hydroxyflavothione, 5,7-dihydroxyflavothione (chrysinthione), 7-dodecyloxy-5-hydroxyflavothione, 7-butyloxy-5-hydroxyflavothione, 2',3,4',7-tetramethoxy-5-hydroxyflavothione, 3,3',4',7-tetramethoxy-5-hydroxyflavothione, 7-butyloxy-4',5-dihydroxyflavothione and 7-butyloxy-4',5-hydroxyflavanonethione have been synthesized from the corresponding hydroxyflavones in two steps, alkylation of the non-hydrogen-bonded hydroxyl groups by bromoalkanes or dimethyl sulfate followed by conversion of the carbonyl group to a thione using Lawesson's Reagent under microwave irradiation and solvent-free conditions. Part of the alkylated flavanone, 7-butyloxy-4',5-dihydroxyflavanone, was oxidized during the treatment with Lawesson's reagent to yield a second product 7-butyloxy-4',5-dihydroxyflavothione in addition to the target product butyloxy-4',5-hydroxyflavanonethione. Deuterium isotope effects on 13C chemical shifts have been measured in hydroxyflavones, isoflavones, flavanones and the thio analogs. Formal four-bond deuterium isotope effects on 13C chemical shifts, nDeltaC=S(OD) are very sensitive to variations in structures and substitution patterns. Density functional theory (DFT) calculations are carried out to obtain geometries. Correlations relating distances around the hydrogen bond system to the deuterium isotope effects on 13C chemical shifts are discussed. 13C chemical shifts are calculated by DFT methods. Effects of thiocarbonyl anisotropies are suggested.
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Affiliation(s)
- Tuyen Kim Pham Nguyen
- Department of Science, Systems and Models, Roskilde University, PO Box 260, DK-4000 Roskilde, Denmark
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Titinchi SJ, Kamounah FS, Abbo HS, Hammerich O. The synthesis of mono- and diacetyl-9H-fluorenes. Reactivity and selectivity in the Lewis acid catalyzed Friedel-Crafts acetylation of 9H-fluorene. ARKIVOC 2008. [DOI: 10.3998/ark.5550190.0009.d11] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Hansen PE, Kamounah FS, Hansen BKV, Spanget-Larsen J. Conformational and tautomeric eccentricities of 2-acetyl-1,8-dihydroxynaphthalenes. Magn Reson Chem 2007; 45:106-17. [PMID: 17154238 DOI: 10.1002/mrc.1925] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Tautomerism in aromatic systems with oxygen substitutents is rare. This is investigated in 2-acetyl-1,8-dihydroxy-3,6-dimethylnaphthalene (1) and in 2,7-diacetyl-1,8-dihydroxy-3,6-dimethylnaphthalene (2). The tautomeric nature of 2-acetyl-1,8-dihydroxy-3,6-dimethylnaphthalene is supported by long-range hydrogen-hydrogen coupling between the OH-1 and the OH-8 and by the isotope effects on 13C caused by deuteration at the CH3C==O methyl group. Compound 2 participates in a degenerate equilibrium between two equivalent nonsymmetrical rotamers (2A and 2B), each having two intramolecular O...HO hydrogen bonds: one involving an acetyl oxygen and the neighboring hydroxyl group, and the other between the oxygen centers at positions 1 and 8. In addition, each rotamer is involved in a tautomeric equilibrium, with a structure having an OH-substituted exocyclic double bond (2AT or 2BT).DFT calculations for a large set of compounds highlight the factors controlling the unusual rotational and tautomeric behaviors. A very important factor seems to be the repulsive interaction between the O-1 and O-8 centers, which is modulated by formation of an OH-1...O-8 or OH-8...O1 hydrogen bond. Steric interactions, mesomeric release of electrons from the oxygen at position 8, and a strong OH...O...C hydrogen bond are other factors.Solid-state 13C NMR spectra of 2,7-diacetyl-1,8-dihydroxy-3,6-dimethylnaphthalene at different temperatures demonstrated no averaging in the solid, whereas partially deuterated 2-acetyl-1,8-dihydroxy-3,6-dimethylnaphthalene showed an isotope effect at C-1 of 1.5 ppm, indicating tautomerism in the solid state.
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Affiliation(s)
- Poul Erik Hansen
- Department of Science, Systems and Models, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark.
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Kamounah FS, Antonov L, Petrov V, van der Zwan G. An integrated approach to the study of the tautomerism of 4-((Phenylimino)methyl) naphthalene-1-ol. J PHYS ORG CHEM 2007. [DOI: 10.1002/poc.1143] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Antonov L, Kamada K, Nedeltcheva D, Ohta K, Kamounah FS. Gradual change of one- and two-photon absorption properties in solution—Protonation of 4-N,N-dimethylamino-4′-aminoazobenzene. J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2005.07.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Fabian WMF, Antonov L, Nedeltcheva D, Kamounah FS, Taylor PJ. Tautomerism in Hydroxynaphthaldehyde Anils and Azo Analogues: a Combined Experimental and Computational Study. J Phys Chem A 2004. [DOI: 10.1021/jp048035z] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Walter M. F. Fabian
- Institut für Chemie, Karl-Franzens Universität Graz, Heinrichstr. 28, A-8010 Graz, Austria, National Forestry University, Faculty of Ecology, 10 Kliment Ohridski Avenue, BG-1756 Sofia, Bulgaria, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G.Bonchev Street, bl.9, Sofia 1113, Bulgaria, CISMI, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, and AstraZeneca, Mereside, Alderley Park, Macclesfield, Cheshire SK10 4TG, England
| | - Liudmil Antonov
- Institut für Chemie, Karl-Franzens Universität Graz, Heinrichstr. 28, A-8010 Graz, Austria, National Forestry University, Faculty of Ecology, 10 Kliment Ohridski Avenue, BG-1756 Sofia, Bulgaria, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G.Bonchev Street, bl.9, Sofia 1113, Bulgaria, CISMI, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, and AstraZeneca, Mereside, Alderley Park, Macclesfield, Cheshire SK10 4TG, England
| | - Daniela Nedeltcheva
- Institut für Chemie, Karl-Franzens Universität Graz, Heinrichstr. 28, A-8010 Graz, Austria, National Forestry University, Faculty of Ecology, 10 Kliment Ohridski Avenue, BG-1756 Sofia, Bulgaria, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G.Bonchev Street, bl.9, Sofia 1113, Bulgaria, CISMI, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, and AstraZeneca, Mereside, Alderley Park, Macclesfield, Cheshire SK10 4TG, England
| | - Fadhil S. Kamounah
- Institut für Chemie, Karl-Franzens Universität Graz, Heinrichstr. 28, A-8010 Graz, Austria, National Forestry University, Faculty of Ecology, 10 Kliment Ohridski Avenue, BG-1756 Sofia, Bulgaria, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G.Bonchev Street, bl.9, Sofia 1113, Bulgaria, CISMI, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, and AstraZeneca, Mereside, Alderley Park, Macclesfield, Cheshire SK10 4TG, England
| | - Peter J. Taylor
- Institut für Chemie, Karl-Franzens Universität Graz, Heinrichstr. 28, A-8010 Graz, Austria, National Forestry University, Faculty of Ecology, 10 Kliment Ohridski Avenue, BG-1756 Sofia, Bulgaria, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G.Bonchev Street, bl.9, Sofia 1113, Bulgaria, CISMI, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, and AstraZeneca, Mereside, Alderley Park, Macclesfield, Cheshire SK10 4TG, England
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Christensen JB, Pittelkow M, Kamounah FS, Boas U, Pedersen B. TFFH as an Excellent Reagent for Acylation of Alcohols, Thiols and Dithiocarbamates. SYNTHESIS-STUTTGART 2004. [DOI: 10.1055/s-2004-831250] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Antonov L, Kamada K, Ohta K, Kamounah FS. A systematic femtosecond study on the two-photon absorbing D-π-A molecules–π-bridge nitrogen insertion and strength of the donor and acceptor groups. Phys Chem Chem Phys 2003. [DOI: 10.1039/b211260d] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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