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Makanyane DM, Maikoo S, Van Heerden FR, Rhyman L, Ramasami P, Mabuza LP, Ngubane P, Khathi A, Mambanda A, Booysen IN. Bovine serum albumin uptake and polypeptide disaggregation studies of hypoglycemic ruthenium(II) uracil Schiff-base complexes. J Inorg Biochem 2024; 255:112541. [PMID: 38554578 DOI: 10.1016/j.jinorgbio.2024.112541] [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: 10/07/2023] [Revised: 02/13/2024] [Accepted: 03/22/2024] [Indexed: 04/01/2024]
Abstract
Our prior studies have illustrated that the uracil ruthenium(II) diimino complex, [Ru(H3ucp)Cl(PPh3)] (1) (H4ucp = 2,6-bis-((6-amino-1,3-dimethyluracilimino)methylene)pyridine) displayed high hypoglycemic effects in diet-induced diabetic rats. To rationalize the anti-diabetic effects of 1, three new derivatives have been prepared, cis-[Ru(bpy)2(urdp)]Cl2 (2) (urdp = 2,6-bis-((uracilimino)methylene)pyridine), trans-[RuCl2(PPh3)(urdp)] (3), and cis-[Ru(bpy)2(H4ucp)](PF6)2 (4). Various physicochemical techniques were utilized to characterize the structures of the novel ruthenium compounds. Prior to biomolecular interactions or in vitro studies, the stabilities of 1-4 were monitored in anhydrous DMSO, aqueous phosphate buffer containing 2% DMSO, and dichloromethane (DCM) via UV-Vis spectrophotometry. Time-dependent stability studies showed ligand exchange between DMSO nucleophiles and chloride co-ligands of 1 and 3, which was suppressed in the presence of an excess amount of chloride ions. In addition, the metal complexes 1 and 3 are stable in both DCM and an aqueous phosphate buffer containing 2% DMSO. In the case of compounds 2 and 4 with no chloride co-ligands within their coordination spheres, high stability in aqueous phosphate buffer containing 2% DMSO was observed. Fluorescence emission titrations of the individual ruthenium compounds with bovine serum albumin (BSA) showed that the metal compounds interact non-discriminately within the protein's hydrophobic cavities as moderate to strong binders. The metal complexes were capable of disintegrating mature amylin amyloid fibrils. In vivo glucose metabolism studies in liver (Chang) cell lines confirmed enhanced glucose metabolism as evidenced by the increased glucose utilization and glycogen synthesis in liver cell lines in the presence of complexes 2-4.
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Affiliation(s)
- Daniel M Makanyane
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Sanam Maikoo
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Fanie R Van Heerden
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius; Centre of Natural Product, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius; Centre of Natural Product, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Lindokuhle P Mabuza
- School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, South Africa.
| | - Phikelelani Ngubane
- School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Andile Khathi
- School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Allen Mambanda
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Irvin N Booysen
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa.
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Bunu MI, Ikhile MI, Tonga Lembe J, Kamdem Kengne MH, Fotsing MCD, Arderne C, Rhyman L, Mmutlane EM, Ramasami P, Ndinteh DT. Isolation, crystal structure and DFT study of 2,2,6,6-tetramethyl-4-oxo-piperidinium nitrate isolated from the stembark of Vitex doniana (Lamiaceae). Nat Prod Res 2024; 38:539-543. [PMID: 36170226 DOI: 10.1080/14786419.2022.2127706] [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: 05/19/2022] [Accepted: 09/12/2022] [Indexed: 10/14/2022]
Abstract
We present the results of the analysis of 2,2,6,6-tetramethyl-4-oxo-piperidinium nitrate isolated from the stem bark of Vitex doniana, a tree growing in Nigeria. The low-temperature molecular structure comprises one 2,2,6,6-tetramethyl-4-oxopiperidinium cation and one nitrate anion as one molecule in the asymmetric unit. The compound crystallizes in the monoclinic space group P21/n. A portion of the nitrate anion exhibits positional disorder with the main disorder component present 66.253(2) % of the time and the minor disorder component present 33.279(2) % of the time. In comparison with the previously reported room-temperature structure of C9H18N2O4 . The low-temperature structure shows similarity with the piperidinium ring adopting a slightly deformed chair conformation while the nitrate anion is disordered. DFT method was used to complement the experimental study.
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Affiliation(s)
- Musa Ismaila Bunu
- Centre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Department of Chemistry, Federal College of Education, Kontagora, Nigeria
| | - Monisola Itohan Ikhile
- Drug Discovery and Smart Molecules Research Laboratory, Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
| | - Jordan Tonga Lembe
- Drug Discovery and Smart Molecules Research Laboratory, Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Centre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Research Center for Synthesis and Catalysis, Department of Chemical sciences, University of Johannesburg, Johannesburg, South Africa
| | - Michael Hermann Kamdem Kengne
- Drug Discovery and Smart Molecules Research Laboratory, Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Centre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Research Center for Synthesis and Catalysis, Department of Chemical sciences, University of Johannesburg, Johannesburg, South Africa
| | - Marthe Carine Djuidje Fotsing
- Drug Discovery and Smart Molecules Research Laboratory, Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Centre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
| | - Charmaine Arderne
- Centre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Research Center for Synthesis and Catalysis, Department of Chemical sciences, University of Johannesburg, Johannesburg, South Africa
| | - Lydia Rhyman
- Centre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius
| | - Edwin Mpho Mmutlane
- Centre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Research Center for Synthesis and Catalysis, Department of Chemical sciences, University of Johannesburg, Johannesburg, South Africa
| | - Ponnadurai Ramasami
- Centre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius
| | - Derek Tantoh Ndinteh
- Drug Discovery and Smart Molecules Research Laboratory, Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
- Centre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
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Ugwu DI, Eze FU, Ezeorah CJ, Rhyman L, Ramasami P, Tania G, Eze CC, Uzoewulu CP, Ogboo BC, Okpareke OC. Synthesis, Structure, Hirshfeld Surface Analysis, Non-Covalent Interaction, and In Silico Studies of 4-Hydroxy-1-[(4-Nitrophenyl)Sulfonyl]Pyrrolidine-2-Carboxyllic Acid. J Chem Crystallogr 2023; 53:1-14. [PMID: 37362239 PMCID: PMC9998016 DOI: 10.1007/s10870-023-00978-0] [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] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 02/14/2023] [Indexed: 06/28/2023]
Abstract
The new compound 4-hydroxy-1-[(4-nitrophenyl)sulfonyl]pyrrolidine-2-carboxyllic acid was obtained by the reaction of 4-hydroxyproline with 4-nitrobenzenesulfonyl chloride. The compound was characterized using single crystal X-ray diffraction studies. Spectroscopic methods including NMR, FTIR, ES-MS, and UV were employed for further structural analysis of the synthesized compound. The title compound was found to have crystallized in an orthorhombic crystal system with space group P212121. The S1-N1 bond length of 1.628 (2) Å was a strong indication of the formation of the title compound. The absence of characteristic downfield 1H NMR peak of pyrrolidine ring and the presence of S-N stretching vibration at 857.82 cm-1 on the FTIR are strong indications for the formation of the sulfonamide. The experimental study was complemented with computations at the B3LYP/6-311G + + (d,p) level of theory to gain more understanding of interactions in the compound at the molecular level. Noncovalent interaction, Hirsfeld surface analysis and interaction energy calculations were employed in the analysis of the supramolecular architecture of the compound. Predicted ADMET parameters, awarded suitable bioavailability credentials, while the molecular docking study indicated that the compound enchants promising inhibition prospects against dihydropteroate synthase, DNA topoisomerase, and SARS-CoV-2 spike. Graphical Abstract Herein we present the solid state structure, noncovalent interaction and spectroscopic analysis of a prospective bioactive compound 4-hydroxy-1-[(4-nitrophenyl)sulphonyl]pyrrolidine-2-carboxyllic acid. Supplementary Information The online version contains supplementary material available at 10.1007/s10870-023-00978-0.
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Affiliation(s)
- David Izuchukwu Ugwu
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, 410001 Nigeria
| | - Florence Uchenna Eze
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, 410001 Nigeria
| | - Chigozie Julius Ezeorah
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, 410001 Nigeria
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208 USA
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 808037 Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, 2028 South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 808037 Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, 2028 South Africa
| | - Groutso Tania
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland, 1142 New Zealand
| | - Cosmas Chinweike Eze
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, 410001 Nigeria
- Natural Science Unit, School of General Studies, University of Nigeria, Nsukka, 410001 Nigeria
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204 USA
| | - Chiamaka Peace Uzoewulu
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, 410001 Nigeria
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204 USA
| | - Blessing Chinweotito Ogboo
- Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, 410001 Nigeria
- Department of Chemistry, State University of NewYork at Buffalo, Buffalo, NY 14260 USA
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Rhyman L, Lee EPF, Ramasami P, Dyke JM. A study of the thermodynamics and mechanisms of the atmospherically relevant reaction dimethyl sulphide (DMS) with atomic chlorine (Cl) in the absence and presence of water, using electronic structure methods. Phys Chem Chem Phys 2023; 25:4780-4793. [PMID: 36692209 DOI: 10.1039/d2cp05814f] [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: 01/19/2023]
Abstract
The thermodynamics and mechanisms of the atmospherically relevant reaction dimethyl sulphide (DMS) + atomic chlorine (Cl) were investigated in the absence and presence of a single water molecule, using electronic structure methods. Stationary points on each reaction surface were located using density functional theory (DFT) with the M06-2X functional with aug-cc-pVDZ (aVDZ) and aug-cc-pVTZ (aVTZ) basis sets. Then fixed point calculations were carried out using the UM06-2X/aVTZ optimised stationary point geometries, with aug-cc-pVnZ basis sets (n = T and Q), using the coupled cluster method [CCSD(T)], as well as the domain-based local pair natural orbitals coupled cluster [DLPNO-UCCSD(T)] approach. Four reaction channels are possible, formation of (A) CH3SCH2 + HCl, (B) CH3S + CH3Cl, (C) CH3SCl + CH3, and (C') CH3S(Cl)CH3. The results show that, in the absence of water, channels A and C' are the dominant channels. In the presence of water, the calculations show that the reaction mechanisms for A and C formation change significantly. Channel A occurs via submerged TSs and is expected to be rapid. Channel B occurs via TSs which present significant energy barriers indicating that this channel is not significant in the presence of water relative to CH3SCH2 + HCl and DMS·Cl adduct formation, as is the case in the absence of water. Channel C was not considered as it is endothermic in the absence of water. In the presence of water, pathways which proceed via (a) DMS·H2O + Cl, (b) Cl·H2O + DMS and (c) DMS·Cl + H2O were considered. It was found that under tropospheric conditions, reactions via pathway (b) are of minor importance relative to those that proceed via pathways (a) and (c). This study has shown that water changes the mechanisms of the DMS + Cl reactions significantly but the presence of water is not expected to affect the overall reaction rate coefficient under atmospheric conditions as the DMS + Cl reaction has a rate coefficient at room temperature close to the collisional limit.
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Affiliation(s)
- Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837, Mauritius. .,Centre For Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, 2028, South Africa
| | - Edmond P F Lee
- School of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837, Mauritius. .,Centre For Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, 2028, South Africa
| | - John M Dyke
- School of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.
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Bhikharee D, Rhyman L, Ramasami P. Computational study of the interaction of the psychoactive amphetamine with 1,2-indanedione and 1,8-diazafluoren-9-one as fingerprinting reagents. RSC Adv 2023; 13:4077-4088. [PMID: 36756547 PMCID: PMC9890558 DOI: 10.1039/d2ra07044h] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Accepted: 01/11/2023] [Indexed: 01/31/2023] Open
Abstract
In this study, we used computational methods to investigate the interaction of amphetamine (AMP) with 1,2-indanedione (IND) and 1,8-diazafluoren-9-one (DFO) so as to understand whether AMP can be detected in latent fingerprints using either of these reagents. The results show that the binding energies of AMP with IND and DFO were enhanced by the presence of amino acid from -9.29 to -12.35 kcal mol-1 and -7.98 to -10.65 kcal mol-1, respectively. The physical origins of these interactions could be better understood by symmetry-adapted perturbation theory. The excited state properties of the binding structures with IND demonstrate distinguishable absorption peaks in the UV-vis spectra but zero fluorescence. Furthermore, the UV-vis spectra of the possible reaction products between AMP and the reagents reveal absorption peaks in the visible spectrum. Therefore, we could predict that reaction of AMP with IND would be observable by a reddish colour while with DFO, a colour change to violet is expected. To conclude, the reagents IND and DFO may be used to detect AMP by UV-vis spectroscopy and if their reactions are allowed, the reagents may then act as a potentially rapid, affordable and easy colorimetric test for AMP in latent fingerprints without destruction of the fingerprint sample.
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Affiliation(s)
- Divya Bhikharee
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius Réduit 80837 Mauritius
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius Réduit 80837 Mauritius
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius Réduit 80837 Mauritius .,Department of Chemistry, University of South Africa Private Bag X6 Florida 1710 South Africa
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Udofia IA, Ekama T, Ogunbayo TB, Oloba-Whenu OA, Rhyman L, Isanbor C, Ramasami P. Experimental and theoretical calculation of pKa values of substituted-2,4,6-trinitrodiphenylamines. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120926] [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: 12/13/2022]
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Aubeeluck-Ragoonauth I, Rhyman L, Somaroo GD, Ramasami P. Physicochemical analysis of wastewater generated from a coating industry in Mauritius. Environ Monit Assess 2022; 194:676. [PMID: 35974238 DOI: 10.1007/s10661-022-10309-z] [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] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 07/11/2022] [Indexed: 06/15/2023]
Abstract
The coating industry is one of the most important consumers of water and chemicals and consequently is a major water polluter in Mauritius. The focus of this study was to characterise wastewater generated by a coating industry in Mauritius. The objectives were to develop a wastewater sampling strategy and to analyse the pollutant parameters as per Mauritian regulations. The wastewater samples were analysed for physicochemical properties and metal abundances over a period of 6 months. The physicochemical parameters analysed were pH, electrical conductivity (EC), true colour, total suspended solids (TSS), biological oxygen demand (BOD5), chemical oxygen demand (COD), nitrate, phosphate, sulphate and free chlorine. The wastewater samples were also analysed for metal ions such as sodium, potassium, arsenic, cadmium, chromium, cobalt, copper, iron, lead, manganese, mercury, molybdenum, nickel and zinc. The results of the physicochemical parameters indicated the presence of biologically resistant organic matters in all the wastewater samples with elevated values of BOD5 and COD, and low biodegradability index, respectively. The coating industry wastewater samples were acidic and saline in nature. Moreover, they presented high concentrations of TSS, free chlorine and sodium ions compared to standard limits promulgated by the Mauritian Government. Spearman's rank correlation matrix with non-linear regression analysis showed significant associations among the measured parameters which were found to have a common origin in the coating industry wastewater. This research will be useful for regular monitoring and setting up an adequate coating industry wastewater treatment for the potential reuse in production processes in Mauritius.
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Affiliation(s)
- Iswaree Aubeeluck-Ragoonauth
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Mauritius, Reduit, 80837, Mauritius
| | - Lydia Rhyman
- Department of Chemistry, Faculty of Science, University of Mauritius, Reduit, 80837, Mauritius
- Department of Chemical Sciences, Doornfontein Campus, Centre for Natural Product Research, University of Johannesburg, Johannesburg, 2028, South Africa
| | - Geeta Devi Somaroo
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Mauritius, Reduit, 80837, Mauritius
| | - Ponnadurai Ramasami
- Department of Chemistry, Faculty of Science, University of Mauritius, Reduit, 80837, Mauritius.
- Department of Chemical Sciences, Doornfontein Campus, Centre for Natural Product Research, University of Johannesburg, Johannesburg, 2028, South Africa.
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Dhonnar SL, Adole VA, More RA, Sadgir NV, Jagdale BS, Pawar TB, Elzagheid MI, Rhyman L, Ramasami P. Synthesis, molecular structure, electronic, spectroscopic, NLO and antimicrobial study of N-benzyl-2-(5-aryl-1,3,4-oxadiazol-2-yl)aniline derivatives. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133017] [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: 10/18/2022]
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Fauzi BOA, Kondo M, Elzagheid MI, Rhyman L, Ramasami P. Functionalization of Two-Dimensional Coordination Polymer in Small Organic Matter Removal from Organic Wastewater. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02435-5] [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: 11/30/2022]
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Joseph I, Louis H, Okon EED, Unimuke TO, Udoikono AD, Magu TO, Maitera O, Elzagheid MI, Rhyman L, Ekeng-ita EI, Ramasami P. Experimental and theoretical study of the dye-sensitized solar cells using Hibiscus sabdariffa plant pigment coupled with polyaniline/graphite counter electrode. PURE APPL CHEM 2022. [DOI: 10.1515/pac-2022-0103] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Abstract
In this research work, the extraction, characterization, device fabrication, and theoretical investigation of Hibiscus sabdariffa plant extract, for possible application in solid DSSCs, are reported. The plant extract was analyzed using FT-IR and UV–Vis spectrophotometry. Polyaniline on graphene was used as the counter electrode whereas titanium (IV) oxide was used as the photo anode for the fabricated DSSCs. The experimental results obtained for the open circuit voltage, short circuit current density, field factor, maximum power and conversion efficiency are 0.925 V, 0.073 A/cm2, 1.43, 1.04 W, and 0.044 % respectively. The excited states of anthocyanin (delphinidin) and quercetin, the most stable structures of Hibiscus sabdariffa plant extract, were studied using density functional theory method. In addition, the theoretical open circuit voltage, light harvesting efficiency, coupling constant, free energy change, and HOMO–LUMO energy gap were predicted for the photovoltaic properties. The theoretical results suggest that quercetin has relatively better photovoltaic properties and, hence, potentially a better dye for solar cell application.
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Affiliation(s)
- Innocent Joseph
- Chemistry Department , Modibbo Adama University of Technology , Yola , Nigeria
| | - Hitler Louis
- Computational and Bio-Simulation Research Group, University of Calabar , Calabar , Nigeria
- Department of Pure and Applied Chemistry , Faculty of Physical Sciences, University of Calabar , Calabar , Nigeria
| | - Emmanuel E. D. Okon
- Department of Pure and Applied Chemistry , Faculty of Physical Sciences, University of Calabar , Calabar , Nigeria
| | - Tomsmith O. Unimuke
- Computational and Bio-Simulation Research Group, University of Calabar , Calabar , Nigeria
- Department of Pure and Applied Chemistry , Faculty of Physical Sciences, University of Calabar , Calabar , Nigeria
| | - Akaninyene D. Udoikono
- Computational and Bio-Simulation Research Group, University of Calabar , Calabar , Nigeria
- Department of Pure and Applied Chemistry , Faculty of Physical Sciences, University of Calabar , Calabar , Nigeria
| | - Thomas O. Magu
- Computational and Bio-Simulation Research Group, University of Calabar , Calabar , Nigeria
- Department of Pure and Applied Chemistry , Faculty of Physical Sciences, University of Calabar , Calabar , Nigeria
| | - Oliver Maitera
- Chemistry Department , Modibbo Adama University of Technology , Yola , Nigeria
| | - Mohamed I. Elzagheid
- Department of Chemical and Process Engineering , Jubail Industrial College , Jubail Industrial City 31961 , Saudi Arabia
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry , Faculty of Science, University of Mauritius , Reduit , Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences , University of Johannesburg , Doornfontein, Johannesburg 2028 , South Africa
| | - Emmanuel I. Ekeng-ita
- Computational and Bio-Simulation Research Group, University of Calabar , Calabar , Nigeria
- Department of Pure and Applied Chemistry , Faculty of Physical Sciences, University of Calabar , Calabar , Nigeria
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry , Faculty of Science, University of Mauritius , Reduit , Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences , University of Johannesburg , Doornfontein, Johannesburg 2028 , South Africa
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Sifuna Wanyonyi F, Fidelis TT, Louis H, Kyalo Mutua G, Orata F, Rhyman L, Ramasami P, Pembere AM. Simulation guided prediction of zeolites for the sorption of selected anions from water: Machine learning predictors for enhanced loading. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118913] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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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Rajagopal K, Dhandayutham S, Nandhagopal M, Narayanasamy M, I Elzagheid M, Rhyman L, Ramasami P. Thiazole derivatives: Synthesis, characterization, biological and DFT studies. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132374] [Citation(s) in RCA: 1] [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: 01/06/2023]
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Korkmaz A, Rhyman L, Ramasami P. Synthesis, characterization, DFT and molecular docking studies of acetone O-((2,5-dichlorophenyl)sulfonyl) oxime. Physical Sciences Reviews 2022. [DOI: 10.1515/psr-2021-0230] [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
Acetone O-((2,5-dichlorophenyl)sulfonyl) oxime was prepared from 2,5-dichlorophenylsulfonyl chloride and acetone oxime using triethylamine. The compound was characterized using 1H NMR and 13C NMR spectra. Molecular docking was performed with the compound and cholinesterase enzymes. The average affinity of the compound with the acetylcholinesterase and butyrylcholinesterase was calculated at −7.46 ± 0.14 and −6.70 ± 0.00 kcal/mol, respectively. The density functional theory method was also used to complement the experimental study. The findings of this work might be useful towards the applications of the compound studied.
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Affiliation(s)
- Adem Korkmaz
- Faculty of Health Science, MuşAlparslan University , Mush , Turkey
| | - Lydia Rhyman
- Department of Chemistry , Computational Chemistry Group, Faculty of Science, University of Mauritius , Reduit 80837 , Mauritius
- Department of Chemical Sciences , Center for Natural Product Research, University of Johannesburg, Doornfontein Campus , Johannesburg 2028 , South Africa
| | - Ponnadurai Ramasami
- Department of Chemistry , Computational Chemistry Group, Faculty of Science, University of Mauritius , Reduit 80837 , Mauritius
- Department of Chemical Sciences , Center for Natural Product Research, University of Johannesburg, Doornfontein Campus , Johannesburg 2028 , South Africa
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Maraf MB, Idrice AA, Mekoung Pélagie MA, Zintchem AAA, Bebga G, Rhyman L, Ibrahim MN, Ramasami P. Decoding the reaction mechanism of the cyclocondensation of ethyl acetate2-oxo-2-(4-oxo-4H-pyrido [1.2-a] pyrimidin-3-yl) polyazaheterocycle and ethylenediamine using bond evolution theory. J Comput Chem 2022; 43:972-985. [PMID: 35383996 DOI: 10.1002/jcc.26853] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 02/05/2022] [Accepted: 02/28/2022] [Indexed: 11/12/2022]
Abstract
We investigated the flow of electron density along the cyclocondensation reaction between ethyl acetate 2-oxo-2-(4-oxo-4H-pyrido[1.2-a]pyrimidin-3-yl) polyazaheterocycle (1) and ethylenediamine (2) at the ωB97XD/6-311++G(d,p)computational method within of bond evolution theory (BET). The exploration of potential energy surface shows that this reaction has three channels (1-3) with the formation of product 3 via channel-2 (the most favorable one) as the main product and this is in good agreement with experimental observations. The BET analysis allows identifying unambiguously the main chemical events happening along channel-2. The mechanism along first step (TS2-a) is described by a series of four structural stability domains (SSDs), while five SSDs for the last two steps (TS2-b and TS2-c). The first and third steps can be summarized as follows, the formation of N1-C6 bond (SSD-II), then, the restoration of the nitrogen N1 lone pair (SSD-III), and finally, the formation of the last O1-H1 bond (SSD-IV). For the second step, the formation of hydroxide ion is noted, as a result of the disappearance of V(C6,O7) basin and the transformation of C6-N1 single bond into double one (SSD-IV). Finally, the appearance of V(O7,H2) basin lead to the elimination of water molecule within the last domain is observed.
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Affiliation(s)
- Mbah Bake Maraf
- Physical and Theoretical Chemistry unit, Laboratory of applied Physical and Analytical Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon.,Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Adjieufack Abel Idrice
- Physical and Theoretical Chemistry unit, Laboratory of applied Physical and Analytical Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon.,Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon.,Laboratory of Theoretical Chemistry (LCT) and Namur Institute of Structured Matter (NISM), University of Namur, Namur, Belgium
| | - Manwal A Mekoung Pélagie
- Physical and Theoretical Chemistry unit, Laboratory of applied Physical and Analytical Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon.,Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Auguste Abouem A Zintchem
- Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Gouet Bebga
- Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
| | - Mbouombouo Ndassa Ibrahim
- Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
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15
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Laloo JZA, Savoo N, Rhyman L, Ramasami P. ExcelAutomat 1.4: generation of supporting information. PURE APPL CHEM 2022. [DOI: 10.1515/pac-2022-0102] [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
Quantum chemical computations generate output files with data. The processing of these data generates results which are presented in a target document, such as a manuscript or supporting information (SI). Several tools and techniques can be employed to facilitate the transfer of data which, otherwise, can be time-consuming with a large number of files. However, depending on the user’s technical knowledge or expertise with the software, additional time has to be invested to set up the software or use the tools. In addition, to the best of the authors’ knowledge, the tools currently available do not provide an option to transfer the data from the output files directly to the target document without the use of custom scripts. The ExcelAutomat tool (Laloo et al., J. Comput. Aided Mol. Des. 2017, 31, 667 and Laloo et al., J. Comp. Chem. 2019, 40, 3) is spreadsheet-based and was developed in-house to facilitate the steps involved in the processing of computational files. The tool was adapted to facilitate the generation of SI in an update of ExcelAutomat 1.4. A graphical user interface was designed where the options for the generation of SI can be defined. ExcelAutomat 1.4 is compatible with Microsoft Excel and the open-source LibreOffice Calc. The extensible tool supports various software packages and parameters by interfacing with the cclib library and through built-in codes. The tool provides a method to transfer data from output files directly to a Microsoft Word or LibreOffice Writer document and can reduce the number of steps, tools or technical knowledge needed to generate SI, especially for users who are familiar with Microsoft Excel or LibreOffice Calc.
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Affiliation(s)
- Jalal Z. A. Laloo
- Computational Chemistry Group, Department of Chemistry , Faculty of Science, University of Mauritius , Réduit 80837 , Mauritius
| | - Nandini Savoo
- Computational Chemistry Group, Department of Chemistry , Faculty of Science, University of Mauritius , Réduit 80837 , Mauritius
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry , Faculty of Science, University of Mauritius , Réduit 80837 , Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences , University of Johannesburg , Doornfontein Campus , Johannesburg 2028 , South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry , Faculty of Science, University of Mauritius , Réduit 80837 , Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences , University of Johannesburg , Doornfontein Campus , Johannesburg 2028 , South Africa
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16
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Bhikharee D, Elzagheid M, Rhyman L, Ramasami P. Effect of water or ethanol on the tautomeric stability and proton transfer reaction of all possible tautomers of hydantoin: Implicit v/s explicit solvation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117942] [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: 11/25/2022]
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17
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Domingo LR, Ríos-Gutiérrez M, Chulan R, Mahmoud MHH, Ibrahim MM, El-Bahy SM, Rhyman L, Ramasami P. Unveiling the non-polar [3+2] cycloaddition reactions of cyclic nitrones with strained alkylidene cyclopropanes within a molecular electron density theory study. RSC Adv 2022; 12:25354-25363. [PMID: 36199340 PMCID: PMC9446111 DOI: 10.1039/d2ra03327e] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 08/23/2022] [Indexed: 11/21/2022] Open
Abstract
The role of cyclopropane substitution on the ethylene in zw-type [3+2] cycloaddition (32CA) reactions of cyclic nitrones has been studied within Molecular Electron Density Theory (MEDT) at the ωB97X-D/6-311G(d,p) computational level. Electron Localization Function (ELF) analysis of the ethylenes shows that the presence the cyclopropane only slightly increases the electron density in the C–C bonding region. Analysis of the Conceptual DFT reactivity indices indicates that the presence of the cyclopropane does not produce any remarkable change in the reactivity of these strained ethylenes. The marginal electrophilic character of ethylene makes the zw-type 32CA reactions of non-polar character. The presence of the cyclopropane in the ethylene decreases the activation enthalpy of the 32CA reactions by only 1.7 and 2.6 kcal mol−1, and also decreases the ortho regioselectivity. The loss of the strain present in the cyclopropane is responsible for the reduction of the activation enthalpy and the increase of the reaction enthalpy in these non-polar 32CA reactions. The presence of the cyclopropane does not cause any change, neither in the transition state structure (TS) geometries nor in their electronic structure. The very low global electron density transfer (GEDT) computed at the TSs confirms the non-polar character of these 32CA reactions. The ortho regioselectivity experimentally observed in these non-polar 32CA reactions is determined by the most favorable two-center interaction between the less electronegative C1 carbon of nitrone and the non-substituted methylene C5 carbon of the ethylenes. The role of cyclopropane substitution on the ethylene in zw-type [3+2] cycloaddition (32CA) reactions of cyclic nitrones has been studied within Molecular Electron Density Theory (MEDT) at the ωB97X-D/6-311G(d,p) computational level.![]()
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Affiliation(s)
- Luis R. Domingo
- Department of Organic Chemistry, University of Valencia, Dr Moliner 50, E-46100 Burjassot, Valencia, Spain
| | - Mar Ríos-Gutiérrez
- Department of Organic Chemistry, University of Valencia, Dr Moliner 50, E-46100 Burjassot, Valencia, Spain
| | - Rishikesh Chulan
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
| | - M. H. H. Mahmoud
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Mohamed M. Ibrahim
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Salah M. El-Bahy
- Department of Chemistry, Turabah University College, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
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Savoo N, Rhyman L, Ramasami P. Theoretical study of a derivative of chlorophosphine with aliphatic and aromatic Grignard reagents: S N2@P or the novel S N2@Cl followed by S N2@C? RSC Adv 2022; 12:9130-9138. [PMID: 35424871 PMCID: PMC8985194 DOI: 10.1039/d2ra00258b] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 03/15/2022] [Indexed: 11/21/2022] Open
Abstract
The proposed SN2 reactions of a hindered organophosphorus reactant with aliphatic and aromatic nucleophiles [Ye et al., Org. Lett., 2017, 19, 5384–5387] were studied theoretically in order to explain the observed stereochemistry of the products.
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Affiliation(s)
- Nandini Savoo
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg 2028, South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
- Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg 2028, South Africa
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Holtomo O, Rhyman L, Nsangou M, Ramasami P, Motapon O. Reaction of •OH with CHCl=CH-CHF2 and its atmospheric implication for future environmental-friendly refrigerant. PURE APPL CHEM 2021. [DOI: 10.1515/pac-2021-0116] [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
In order to understand the atmospheric implication of the chlorinated hydrofluoroolefin (HFO), the geometrical structures and the IR absorption cross sections of the stereoisomers 1-chloro-3,3-difluoropropene were studied using the B3LYP/6-31G(3df) and M06-2X/6-31G(3df) methods in the gas phase. The cis-trans isomerization was assessed using the M06-2X/6-311++G(3df,p)//6-31+G(3df,p) method. The latter method was also employed for thermochemistry and the rate coefficients of the reactions of •OH with the cis- and trans-isomers in the temperature ranging from 200 to 400 K. The computational method CCSD/cc-pVTZ//M06-2X/6-31+G(3df,p) was used to benchmark the rate coefficients. It turns out that, the trans-isomer is more stable than cis-isomer and the trans- to cis-isomerization is thermodynamically unfavorable. The rate coefficient follows the Gaussian law with respect to the inverse of temperature. At the global temperature of stratosphere, the calculated rate coefficients served to estimate the atmospheric lifetime along with the photochemical ozone creation potential (POCP). This yielded lifetimes of 4.31 and 7.31 days and POCPs of 3.80 and 2.23 for the cis- and trans-isomer, respectively. The radiative forcing efficiencies gave 0.0082 and 0.0152 W m−2 ppb−1 for the cis- and trans-isomer, respectively. The global warming potential approached zero for both stereoisomers at 20, 100, and 500 years time horizons.
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Affiliation(s)
- Olivier Holtomo
- Department of Physics , Faculty of Science, University of Bamenda , Bambili P.O. Box 39 , Cameroon
- Department of Physics , Faculty of Science, University of Maroua , Maroua P.O. Box 814 , Cameroon
| | - Lydia Rhyman
- Department of Chemistry , Computational Chemistry Group, Faculty of Science, University of Mauritius , Réduit 80837 Mauritius
- Department of Chemical Sciences , Centre for Natural Product Research, University of Johannesburg , Doornfontein , Johannesburg 2028 , South Africa
| | - Mama Nsangou
- Department of Physics , Higher Teacher's Training College, University of Maroua , Maroua P.O. Box 46 , Cameroon
- Department of Physics , Faculty of Science, University of Ngaoundéré , Ngaoundéré P.O. Box 454 , Cameroon
| | - Ponnadurai Ramasami
- Department of Chemistry , Computational Chemistry Group, Faculty of Science, University of Mauritius , Réduit 80837 Mauritius
- Department of Chemical Sciences , Centre for Natural Product Research, University of Johannesburg , Doornfontein , Johannesburg 2028 , South Africa
| | - Ousmanou Motapon
- Department of Physics , Faculty of Science, University of Maroua , Maroua P.O. Box 814 , Cameroon
- Laboratory of Fundamental Physics, Faculty of Science, University of Douala , Douala P.O. Box 24157 , Cameroon
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20
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Parlak C, Alver Ö, Ouma CNM, Rhyman L, Ramasami P. Interaction between favipiravir and hydroxychloroquine and their combined drug assessment: in silico investigations. ACTA ACUST UNITED AC 2021; 76:1471-1478. [PMID: 34744292 PMCID: PMC8562770 DOI: 10.1007/s11696-021-01946-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 05/19/2021] [Accepted: 10/22/2021] [Indexed: 12/23/2022]
Abstract
Hydroxychloroquine (HCQ) and favipiravir (FPV) are known to be effective antivirals, and there are reports about their use to fight the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) despite that these are not conclusive. The use of combined drugs is common in drug discovery, and thus, we investigated HCQ and FPV as a combined drug. The density functional theory method was used for the optimization of geometries, spectroscopic analysis and calculation of reactivity parameters. The quantum theory of atoms in molecules was applied to explain the nature of the hydrogen bonds and confirm the higher stability of the combined drug. We also evaluated the absorption, distribution, metabolism and excretion (ADME) parameters to assess their drug actions jointly using SwissADME. The preliminary findings of our theoretical study are promising for further investigations of more potent and selective antiviral drugs.
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Affiliation(s)
- Cemal Parlak
- Department of Physics, Science Faculty, Ege University, Izmir, 35100 Turkey
| | - Özgür Alver
- Department of Physics, Science Faculty, Eskisehir Technical University, Eskisehir, Turkey
| | - Cecil Naphtaly Moro Ouma
- HySA-Infrastructure CoC, Faculty of Engineering, North-West University, Private Bag X6001, Potchefstroom, 2531 South Africa
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837 Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg, 2028 South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837 Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg, 2028 South Africa
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21
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Maikoo S, Booysen IN, Xulu B, Rhyman L, Ramasami P. Stabilization of the ruthenium (II) and -(III) centres by chelating N-donor ligands: Synthesis, characterization, biomolecular affinities and computational studies. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130986] [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: 11/25/2022]
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22
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Hallooman D, Rhyman L, Dalkılıç E, Daştan A, Elzagheid MI, Domingo LR, Ramasami P. Theoretical Studies on the Mechanism of the Formation of Cyclopentadienes and Dihydropyridazines. ChemistrySelect 2021. [DOI: 10.1002/slct.202102928] [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: 11/09/2022]
Affiliation(s)
- Dhanashree Hallooman
- Computational Chemistry Group Department of Chemistry Faculty of Science University of Mauritius Moka, Réduit 80837 Mauritius
| | - Lydia Rhyman
- Computational Chemistry Group Department of Chemistry Faculty of Science University of Mauritius Moka, Réduit 80837 Mauritius
- Centre for Natural Product Research Department of Chemical Sciences University of Johannesburg, Doornfontein Johannesburg 2028 South Africa
| | - Erdin Dalkılıç
- Atatürk University Science Faculty, Department of Chemistry Erzurum 25240 Turkey
| | - Arif Daştan
- Atatürk University Science Faculty, Department of Chemistry Erzurum 25240 Turkey
| | - Mohamed I. Elzagheid
- Department of Chemical and Process Engineering Jubail Industrial College Jubail Industrial City 31961 Saudi Arabia
| | - Luis R. Domingo
- Department of Organic Chemistry University of Valencia Dr. Moliner 50 E-46100 Burjassot Valencia Spain
| | - Ponnadurai Ramasami
- Computational Chemistry Group Department of Chemistry Faculty of Science University of Mauritius Moka, Réduit 80837 Mauritius
- Centre for Natural Product Research Department of Chemical Sciences University of Johannesburg, Doornfontein Johannesburg 2028 South Africa
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23
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Kobkeatthawin T, Chantrapromma S, Suwunwong T, Rhyman L, Choong YS, Ramasami P. Synthesis, Molecular Docking and Tyrosinase Inhibitory Activity of the Decorated Methoxy Sulfonamide Chalcones: in vitro Inhibitory Effects and the Possible Binding Mode. SAINS MALAYS 2021. [DOI: 10.17576/jsm-2021-5009-09] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this study, a series of sulfonamide chalcones derivatives was synthesized and its chemical structures were confirmed by spectral characteristics. The synthesized compounds were evaluated for their tyrosinase inhibitory activities along with molecular docking study. The tyrosinase inhibitory results indicated that compounds 5b, 5c, 5f, 5g and 5h displayed the significant tyrosinase inhibitory activity and comparable to the standard drug (kojic acid). Compound 5c exhibits the most potent tyrosinase inhibition among the synthesized compounds with IC50 = 0.43±0.07 mM, L-DOPA as the substrate, and better than that of the standard kojic acid (IC50 = 0.60±0.20 mM). Molecular docking studies showed that the binding mode of some compounds is in the tyrosinase binding pocket surrounding the copper in the active site. The correlation between the docking results with IC50 values showed that the binding mode prediction of the test compounds would also be convincing. This comprehensive study allows for a possible mechanism for the antityrosinase activity of the sulfonamide chalcones. These sulfonamide chalcones bind to copper atoms of tyrosinase which responsible for the catalytic activity of tyrosinase. These compounds may be used as a lead for rational drug designing for the multi-functional tyrosinase inhibitor.
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Parlak C, Alver Ö, Ouma CNM, Rhyman L, Ramasami P. Can the Antivirals Remdesivir and Favipiravir Work Better Jointly? In Silico Insights. Drug Res (Stuttg) 2021; 72:34-40. [PMID: 34535038 DOI: 10.1055/a-1585-1323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The proverb "Old is gold" is applicable in drug discovery and the proverb "All that Glitters is not Gold" is also appropriate. In the COVID-19 era, there has been a race for drugs to be effective against SARS-CoV-2. There are reports about the uses of Remdesivir and Favipiravir as existing antivirals against virus but none have been conclusive so far. In the attempts for innovations, the combination of drugs is also under trials. Therefore, we used the density functional theory method and quantum theory of atoms in molecules to investigate drug-drug interactions involving Remdesivir and Favipiravir. The computed parameters were related to the antiviral actions of both drugs together. The results indicate enhanced antiviral activity and it will be worthy to consider additional investigations with the combination of these two drugs.
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Affiliation(s)
- Cemal Parlak
- Department of Physics, Science Faculty, Ege University, Izmir, Turkey
| | - Özgür Alver
- Department of Physics, Science Faculty, Eskisehir Technical University, Eskisehir, Turkey
| | - Cecil N M Ouma
- HySA-Infrastructure CoC, North-West University, Faculty of Engineering, Potchefstroom, South Africa
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa
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Choong YS, Lim YY, Soong JX, Savoo N, Guida C, Rhyman L, Ramracheya R, Ramasami P. Theoretical study of the interactions between peptide tyrosine tyrosine [PYY (1-36)], a newly identified modulator in type 2 diabetes pathophysiology, with receptors NPY1R and NPY4R. Hormones (Athens) 2021; 20:557-569. [PMID: 33782920 DOI: 10.1007/s42000-021-00278-2] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 02/10/2021] [Indexed: 11/30/2022]
Abstract
PURPOSE Diabetes mellitus is a common condition in the clinically obese. Bariatric surgery is one of the ways to put type 2 diabetes in remission. Recent findings propose the appetite-regulator peptide tyrosine tyrosine (PYY) as a therapeutic option for patients with type 2 diabetes. This novel gut hormone restores impaired insulin and glucagon secretion in pancreatic islets and is implicated in type 2 diabetes reversal after bariatric surgery. The current study elucidates the interactions between PYY and the NPY1R and NPY4R receptors using computational methods. METHODS Protein structure prediction, molecular docking simulation, and molecular dynamics (MD) simulation were performed to elucidate the interactions of PYY with NPY1R and NPY4R. RESULTS The predicted binding models of PYY-NPY receptors are in agreement with those described in the literature, although different interaction partners are presented for the C-terminal tail of PYY. Non-polar interactions are predicted to drive the formation of the protein complex. The calculated binding energies show that PYY has higher affinity for NPY4R (ΔGGBSA = -65.08 and ΔGPBSA = -87.62 kcal/mol) than for NPY1R (ΔGGBSA = -23.11 and ΔGPBSA = -50.56 kcal/mol). CONCLUSIONS Based on the constructed models, the binding conformations obtained from docking and MD simulation for both the PYY-NPY1R and PYY-NPY4R complexes provide a detailed map of possible interactions. The calculated binding energies show a higher affinity of PYY for NPY4R. These findings may help to understand the mechanisms behind the improvement of diabetes following bariatric surgery.
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Affiliation(s)
- Yee Siew Choong
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, 11800, Penang, Malaysia.
| | - Yee Ying Lim
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Jia Xin Soong
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Nandini Savoo
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
| | - Claudia Guida
- Oxford Centre for Diabetes, Endocrinology & Metabolism, University of Oxford, Oxford, OX3 7LJ, United Kingdom
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
- Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Reshma Ramracheya
- Oxford Centre for Diabetes, Endocrinology & Metabolism, University of Oxford, Oxford, OX3 7LJ, United Kingdom.
- Pharmaceutical Operations, Centre International de Dévelopment Pharmaceutique, BioPark Mauritius, Socota Phoenicia, Phoenix 73408, Mauritius.
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius.
- Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa.
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Abdul-Hammed M, Adedotun IO, Olajide M, Irabor CO, Afolabi TI, Gbadebo IO, Rhyman L, Ramasami P. Virtual screening, ADMET profiling, PASS prediction, and bioactivity studies of potential inhibitory roles of alkaloids, phytosterols, and flavonoids against COVID-19 main protease (M pro). Nat Prod Res 2021; 36:3110-3116. [PMID: 34107799 PMCID: PMC8204315 DOI: 10.1080/14786419.2021.1935933] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The current research used a virtual screening method to study 57 isolated phytochemicals (alkaloids, phytosterols, and flavonoids) against the SARS-CoV-2 main protease (Mpro). The absorption, distribution, metabolism, excretion, and toxicity (ADMET) of the selected compounds were analysed using admetSAR tool while SwissADME and Molinspiration chemoinformatics tools were used to examine the oral bioavailability and drug-likeness properties. Parameters such as physicochemical properties, activity spectra for substances (PASS) prediction, bioactivity, binding mode, and molecular interactions were also analysed. Our results favoured Lupeol (-8.6 kcal/mol), Lupenone (-7.7 kcal/mol), Hesperetin (-7.4 kcal/mol), Apigenin (-7.3 kcal/mol) and Castasterone (-7.3 kcal/mol) as probable inhibitors of SARS-CoV-2. This is because of their good binding affinities, bioactivities, drug-likeness, ADMET properties, PASS properties, oral bioavailability, binding mode and their interactions with the active site of the target receptor compared to Remdesivir and Azithromycin. Therefore, these compounds could be explored towards the development of new therapeutic agents against SARS-CoV-2.
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Affiliation(s)
- Misbaudeen Abdul-Hammed
- Computational Biophysical Chemistry Laboratory, Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
| | - Ibrahim Olaide Adedotun
- Computational Biophysical Chemistry Laboratory, Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
| | - Monsurat Olajide
- Department of Biochemistry, College of Natural and Applied Sciences, Crescent University, Sapon, Abeokuta, Ogun State, Nigeria
| | - Christianah Otoame Irabor
- Computational Biophysical Chemistry Laboratory, Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
| | - Tolulope Irapada Afolabi
- Computational Biophysical Chemistry Laboratory, Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
| | | | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, South Africa
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27
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Kavipriya R, Kavitha HP, Karthikeyan B, Vennila JP, Rhyman L, Ramasami P. 2,4-Dimorpholino-4-yl-6-(4-nitrophenoxy)-[1,3,5]-triazine: Structural and spectroscopic study using experimental and DFT method. Physical Sciences Reviews 2021. [DOI: 10.1515/psr-2019-0003] [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
2,4-Dimorpholino-4-yl-6-(4-nitrophenoxy)-[1,3,5]-triazine (DMNT) was synthesized and the molecular structure and vibrational frequencies were studied by density functional theory (DFT) method. The functional used was Becke’s three parameter exchange functional combined with the Lee-Yang-Parr correlation (B3LYP) and the standard basis set was 6-31G(d) for all atoms. The Fourier Transform-Infra Red (FT-IR) and FT-Raman spectra of DMNT were recorded and complete assignments of the observed vibrational frequencies are done. The assignments were confirmed by isotopic labelling. The structural parameters, harmonic vibrational frequencies, IR intensities and Raman intensities of DMNT in the ground-state were also computed. Non-linear optical behaviour of DMNT was analysed by examining the properties like electric dipole moment, polarizability and hyperpolarizability. Molecular properties such as ionization potential, electro-negativity, chemical potential and chemical hardness were obtained from molecular orbital analysis. Hyper conjugative interaction and charge delocalization taking place in DMNT was confirmed by Natural bond analysis studies. UV-Vis spectrum of DMNT was also recorded to understand the electronic properties.
Graphical Abstract:
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Affiliation(s)
- R. Kavipriya
- SRM Institute of Science and Technology, Ramapuram campus , Department of Chemistry , 600089 Chennai , India
| | - Helen P. Kavitha
- SRM Institute of Science and Technology, Ramapuram campus , Department of Chemistry , 600089 Chennai , India
| | - B. Karthikeyan
- Department of Chemistry , Annamalai University , Annamalai Nagar , Tamilnadu , India
| | - Jasmine P. Vennila
- Department of Physics , Panimalar Institute of Technology , Chennai , Tamilnadu , India
| | - Lydia Rhyman
- University of Mauritius , Department of Chemistry , Computational Chemistry Group , Faculty of Science , 80832 Réduit , Mauritius
| | - Ponnadurai Ramasami
- University of Mauritius , Department of Chemistry , Computational Chemistry Group , Faculty of Science , 80832 Réduit , Mauritius
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28
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Pacherille A, Tuga B, Hallooman D, Dos Reis I, Vermette M, Issack BB, Rhyman L, Ramasami P, Sunasee R. BiCl 3-Facilitated removal of methoxymethyl-ether/ester derivatives and DFT study of –O–C–O– bond cleavage. NEW J CHEM 2021. [DOI: 10.1039/d1nj00449b] [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: 12/14/2022]
Abstract
An experimental and DFT study of the cleavage of the MOM group mediated by an eco-friendly reagent, bismuth trichloride.
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Affiliation(s)
- Angela Pacherille
- Department of Chemistry
- State University of New York at Plattsburgh
- Plattsburgh
- USA
| | - Beza Tuga
- Department of Chemistry
- State University of New York at Plattsburgh
- Plattsburgh
- USA
| | - Dhanashree Hallooman
- Computational Chemistry Group, Department of Chemistry
- Faculty of Science, University of Mauritius
- Réduit 80837
- Mauritius
| | - Isaac Dos Reis
- Department of Chemistry
- State University of New York at Plattsburgh
- Plattsburgh
- USA
| | - Mélodie Vermette
- Département des Sciences Expérimentales
- Université de Saint-Boniface
- Winnipeg
- Canada
| | - Bilkiss B. Issack
- Département des Sciences Expérimentales
- Université de Saint-Boniface
- Winnipeg
- Canada
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry
- Faculty of Science, University of Mauritius
- Réduit 80837
- Mauritius
- Department of Chemical Sciences
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry
- Faculty of Science, University of Mauritius
- Réduit 80837
- Mauritius
- Department of Chemical Sciences
| | - Rajesh Sunasee
- Department of Chemistry
- State University of New York at Plattsburgh
- Plattsburgh
- USA
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29
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Kheddo A, Rhyman L, Elzagheid MI, Jeetah P, Ramasami P. Adsorption of synthetic dyed wastewater using activated carbon from rice husk. SN Appl Sci 2020. [DOI: 10.1007/s42452-020-03922-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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30
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Parlak C, Atan BS, Rhyman L, Ramasami P. Structural and spectroscopic properties of 3-halogenobenzaldehydes: DFT and TDDFT simulations. Physical Sciences Reviews 2020. [DOI: 10.1515/psr-2019-0140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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
Conformers of 3-halogenobenzaldehydes (3HB, halogen atom: F [3FB], Cl [3CB] and Br [3BB]) in the gas phase and solutions were studied using density functional theory (DFT) and time dependent density functional theory (TDDFT), B3LYP functional and MP2 method with 6–311+G(3df,p) and aug-cc-pVDZ basis sets. The present study aims to investigate the halogen and medium effects on the conformational stability, structural parameter, dipole moment, carbonyl stretching frequency, frontier molecular orbitals, band gap, absorption band and density of states. Carbonyl stretching frequencies were evaluated with some solvent models. All results will be useful for further analysis of halogen-substituted benzaldehydes.
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Affiliation(s)
- Cemal Parlak
- Department of Physics , Science Faculty, Ege University , Izmir , Turkey
| | - Berna Sümeyra Atan
- Graduate School of Natural and Applied Sciences , Kutahya Dumlupınar University , Kütahya , Turkey
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry , Faculty of Science, University of Mauritius , Réduit 80837 , Mauritius
- Department of Applied Chemistry , University of Johannesburg, Doornfontein Campus , Johannesburg 2028 , South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry , Faculty of Science, University of Mauritius , Réduit 80837 , Mauritius
- Department of Applied Chemistry , University of Johannesburg, Doornfontein Campus , Johannesburg 2028 , South Africa
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31
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Rhyman L, Ríos-Gutiérrez M, Domingo LR, Ramasami P. Unveiling the high reactivity of benzyne in the formal [3+2] cycloaddition reactions towards thioamides through the Molecular Electron Density Theory. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131458] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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32
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Kavipriya R, Kavitha HP, Vennila JP, Rhyman L, Ramasami P. Spectroscopic and DFT studies of 2,4-dichloro-N-phenethylbenzenesulfonamide. Physical Sciences Reviews 2020. [DOI: 10.1515/psr-2019-0002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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
AbstractThe Fourier-transform infrared spectroscopy (FT-IR) spectrum of 2,4-dichloro-N-phenethylbenzenesulfonamide (DPBS) was obtained and the compound was studied theoretically. The optimized geometry, total electronic energy and vibrational wavenumbers of DPBS were examined using Hartree–Fock (HF) and density functional theory (DFT) method such as B3LYP, BP86 and M06 functionals with the basis set of 6-311++G(d,p) for all atoms. A complete vibrational assignment was studied for DPBS. The molecular orbital energies, polarizability and thermodynamic properties of DPBS were also computed. Analysis of molecular orbitals reveals the parameters such as chemical potential, chemical hardness and electrophilicity index. The molecular properties such as electric dipole moment µ, polarizability α, and hyperpolarizability β reveal the non-linear optical (NLO) property of DPBS. Natural bond analysis study reveals charge delocalization of the molecule. The experimental and computational results are found to have good agreement among themselves. The results of this work will pave the way for further insight in the study of the applications of DPBS.Graphical Abstract:
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Affiliation(s)
- R. Kavipriya
- Department of Chemistry, SRM Institute of Science and Technology, Ramapuram campus, Chennai, Tamilnadu 600089, India
| | - Helen P. Kavitha
- Department of Chemistry, SRM Institute of Science and Technology, Ramapuram campus, Chennai, Tamilnadu 600089, India
| | - Jasmine P. Vennila
- Department of Physics, Panimalar Institute of Technology, 6 Icross street, Bharathi Nagar, Ramapuram, Chennai, Tamilnadu600 089, India
| | - Lydia Rhyman
- Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
- Department of Chemistry, University of Mauritius, Réduit 80832, Mauritius
| | - Ponnadurai Ramasami
- Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
- Department of Chemistry, University of Mauritius, Réduit 80832, Mauritius
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33
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Ernouf G, Chirkin E, Rhyman L, Ramasami P, Cintrat J. Photochemical Strain‐Release‐Driven Cyclobutylation of C(sp
3
)‐Centered Radicals. Angew Chem Int Ed Engl 2020; 59:2618-2622. [DOI: 10.1002/anie.201908951] [Citation(s) in RCA: 28] [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] [Received: 07/17/2019] [Revised: 09/11/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Guillaume Ernouf
- Service de Chimie Bio-organique et Marquage (SCBM)CEA, Université Paris-Saclay 91191 Gif-sur-Yvette France
| | - Egor Chirkin
- Service de Chimie Bio-organique et Marquage (SCBM)CEA, Université Paris-Saclay 91191 Gif-sur-Yvette France
| | - Lydia Rhyman
- Computational Chemistry GroupDepartment of ChemistryFaculty of ScienceUniversity of Mauritius Réduit 80837 Mauritius
- Department of Chemical SciencesUniversity of Johannesburg Doornfontein Johannesburg 2028 South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry GroupDepartment of ChemistryFaculty of ScienceUniversity of Mauritius Réduit 80837 Mauritius
- Department of Chemical SciencesUniversity of Johannesburg Doornfontein Johannesburg 2028 South Africa
| | - Jean‐Christophe Cintrat
- Service de Chimie Bio-organique et Marquage (SCBM)CEA, Université Paris-Saclay 91191 Gif-sur-Yvette France
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34
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Emambocus S, Rhyman L, Ramasami P. Theoretical Study of the Microhydration the Chemical Warfare Agent Sulfur Mustard. ACS Omega 2020; 5:1822-1831. [PMID: 32039318 PMCID: PMC7003240 DOI: 10.1021/acsomega.9b03061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 12/31/2019] [Indexed: 06/10/2023]
Abstract
A microhydration study of sulfur mustard (SM) was carried out using M06-2X, B3LYP, B3LYP-D3, and MP2 levels of theory with the 6-311++G(2d,2p) basis set. The changes in energetics, structural parameters and vibrational wavenumbers following the addition of up to three discrete water molecules to SM were analyzed. We observed slight changes in the geometry of SM upon microhydration. The stability of hydrated clusters is due to weak C-H···O-H hydrogen bonds. The free energy change for the formation of the clusters is positive at room temperature and becomes exergonic when the temperature decreases. The infrared stretchings of C-Cl of SM and O-H of water are redshifted upon the addition of water molecules. The findings from this work add to the literature of hydrated SM and can be useful in its detection and subsequent destruction.
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Affiliation(s)
- Shëyhaane
A. Emambocus
- Computational
Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
| | - Lydia Rhyman
- Computational
Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
- Department
of Chemical Sciences, University of Johannesburg, PO Box 17011, Doornfontein, Johannesburg 2028, South Africa
| | - Ponnadurai Ramasami
- Computational
Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
- Department
of Chemical Sciences, University of Johannesburg, PO Box 17011, Doornfontein, Johannesburg 2028, South Africa
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35
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Uahengo V, Naimhwaka J, Daniel LS, Rahman A, Elzagheid MI, Rhyman L, Ramasami P, Cai P. Correction: A colorimetric probe for the real-time naked eye detection of cyanide and hydroxide ions in tap water: experimental and theoretical studies. Analyst 2020; 145:295. [DOI: 10.1039/c9an90120e] [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: 11/21/2022]
Abstract
Correction for ‘A colorimetric probe for the real-time naked eye detection of cyanide and hydroxide ions in tap water: experimental and theoretical studies’ by Veikko Uahengo et al., Analyst, 2019, 144, 6422–6431.
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Affiliation(s)
- Veikko Uahengo
- Department of Chemistry and Biochemistry
- University of Namibia
- Windhoek
- Namibia
| | - Johannes Naimhwaka
- Department of Chemistry and Biochemistry
- University of Namibia
- Windhoek
- Namibia
| | - Likius S. Daniel
- Department of Chemistry and Biochemistry
- University of Namibia
- Windhoek
- Namibia
| | - Ateeq Rahman
- Department of Chemistry and Biochemistry
- University of Namibia
- Windhoek
- Namibia
| | - Mohamed I. Elzagheid
- Department of Chemical and Process Engineering
- Jubail Industrial College
- Jubail Industrial City 31961
- Saudi Arabia
| | - Lydia Rhyman
- Computational Chemistry Group
- Department of Chemistry
- Faculty of Science
- University of Mauritius
- Réduit 80837
| | - Ponnadurai Ramasami
- Computational Chemistry Group
- Department of Chemistry
- Faculty of Science
- University of Mauritius
- Réduit 80837
| | - Ping Cai
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- China
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36
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Imrit YA, Bhakhoa H, Sergeieva T, Danés S, Savoo N, Elzagheid MI, Rhyman L, Andrada DM, Ramasami P. A theoretical study of the hydrolysis mechanism of A-234; the suspected novichok agent in the Skripal attack. RSC Adv 2020; 10:27884-27893. [PMID: 35519147 PMCID: PMC9055627 DOI: 10.1039/d0ra05086e] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 07/17/2020] [Indexed: 12/17/2022] Open
Abstract
A-234, [EtO–P(
Created by potrace 1.16, written by Peter Selinger 2001-2019
]]>
O)(F)–NC(Me)–N(Et)2], is the suspected A-type nerve agent used in the Skripal attack on the 4th of March 2018. Studies related to the structure and reactivity of this compound are limited. We, therefore, aimed at understanding the underlying hydrolysis mechanism of A-234 within the DFT framework. The attack of the water molecule can occur at the phosphinate and acetoamidine reactive centres. Our theoretical findings indicate that the hydrolysis at the acetoamidine centre is thermodynamically favoured compared to the hydrolysis at the phosphinate centre. The hydrolysis at the acetoamidine moiety may proceed via two pathways, depending on the nitrogen atom participating in the hydrolysis. The main pathway consists of four distinct channels to reach the final product, with the concerted 1,3-proton shift favoured kinetically and thermodynamically in the gas phase and water as solvent. The results are in good agreement with the literature, although some differences in the reaction mechanism were observed. A theoretical study of the hydrolysis mechanism of A-234 [EtO–P(O)(F)–NC(Me)–N(Et)2]; the suspected novichok agent in the Skripal attack.![]()
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Affiliation(s)
- Yadhav A. Imrit
- Computational Chemistry Group
- Department of Chemistry
- Faculty of Science
- University of Mauritius
- Réduit 80837
| | - Hanusha Bhakhoa
- Computational Chemistry Group
- Department of Chemistry
- Faculty of Science
- University of Mauritius
- Réduit 80837
| | - Tetiana Sergeieva
- Faculty of Natural Sciences and Technology
- Department of Chemistry
- Saarland University
- 66123 Saarbrücken
- Federal Republic of Germany
| | - Sergi Danés
- Faculty of Natural Sciences and Technology
- Department of Chemistry
- Saarland University
- 66123 Saarbrücken
- Federal Republic of Germany
| | - Nandini Savoo
- Computational Chemistry Group
- Department of Chemistry
- Faculty of Science
- University of Mauritius
- Réduit 80837
| | - Mohamed I. Elzagheid
- Department of Chemical and Process Engineering
- Jubail Industrial College
- Jubail Industrial City 31961
- Saudi Arabia
| | - Lydia Rhyman
- Computational Chemistry Group
- Department of Chemistry
- Faculty of Science
- University of Mauritius
- Réduit 80837
| | - Diego M. Andrada
- Faculty of Natural Sciences and Technology
- Department of Chemistry
- Saarland University
- 66123 Saarbrücken
- Federal Republic of Germany
| | - Ponnadurai Ramasami
- Computational Chemistry Group
- Department of Chemistry
- Faculty of Science
- University of Mauritius
- Réduit 80837
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37
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Savoo N, Laloo JZA, Rhyman L, Ramasami P, Bickelhaupt FM, Poater J. Activation Strain Analyses of Counterion and Solvent Effects on the Ion-Pair S N 2 Reaction of NH 2 - and CH 3 Cl. J Comput Chem 2019; 41:317-327. [PMID: 31713259 DOI: 10.1002/jcc.26104] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 08/27/2019] [Revised: 10/21/2019] [Accepted: 10/21/2019] [Indexed: 11/09/2022]
Abstract
We have computationally studied the bimolecular nucleophilic substitution (SN 2) reactions of Mn NH2 (n-1) + CH3 Cl (M+ = Li+ , Na+ , K+ , and MgCl+ ; n = 0, 1) in the gas phase and in tetrahydrofuran solution at OLYP/6-31++G(d,p) using polarizable continuum model implicit solvation. We wish to explore and understand the effect of the metal counterion M+ and of solvation on the reaction profile and the stereochemical preference, that is, backside (SN 2-b) versus frontside attack (SN 2-f). The results were compared to the corresponding ion-pair SN 2 reactions involving F- and OH- nucleophiles. Our analyses with an extended activation strain model of chemical reactivity uncover and explain various trends in SN 2 reactivity along the nucleophiles F- , OH- , and NH 2 - , including solvent and counterion effects. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Nandini Savoo
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837, Mauritius
| | - Jalal Z A Laloo
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837, Mauritius
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837, Mauritius.,Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg, 2028, South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837, Mauritius.,Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg, 2028, South Africa
| | - F Matthias Bickelhaupt
- Department of Theoretical Chemistry, Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, NL-1081 HV, Amsterdam, The Netherlands.,Institute for Molecules and Materials, Radboud University Nijmegen, NL-6525 AJ, Nijmegen, The Netherlands
| | - Jordi Poater
- Departament de Química Inorgànica i Orgànica & IQTCUB, Universitat de Barcelona, 08028, Barcelona, Spain.,ICREA, 08010, Barcelona, Spain
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38
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Uahengo V, Naimhwaka J, Daniel LS, Rahman A, Elzagheid MI, Rhyman L, Ramasami P, Cai P. A colorimetric probe for the real-time naked eye detection of cyanide and hydroxide ions in tap water: experimental and theoretical studies. Analyst 2019; 144:6422-6431. [PMID: 31584578 DOI: 10.1039/c9an01481k] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Herein, a colorimetric sensor (L) based on a naphthyl derivative bearing hydrazone receptors was synthesized via a one-step reaction process, and its recognition properties towards biologically important anions in an acetonitrile-water mixture were investigated by naked-eye observation and UV-Vis and 1H NMR spectroscopy. The molar addition of anions, such as TBAF-, TBAOH-, TBACN- and TBAAcO-, induced a significant red shift in the charge transfer band (Δλ = 73 nm, from 337 nm to 410 nm), in agreement with visible "naked eye" detectable colorimetric activities; in addition, soaked-in-L paper strips were prepared, which could significantly discriminate cyanide (KCN) and hydroxide (NaOH) ions dissolved in tap water via the litmus test method. This study was complemented by density functional theory computations to gain more insight into the interaction between L and anions.
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Affiliation(s)
- Veikko Uahengo
- Department of Chemistry and Biochemistry, University of Namibia, 340 Mandume Ndemufayo Avenue, Windhoek, 9000, Namibia.
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39
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Ernouf G, Chirkin E, Rhyman L, Ramasami P, Cintrat J. Photochemical Strain‐Release‐Driven Cyclobutylation of C(sp
3
)‐Centered Radicals. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908951] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Guillaume Ernouf
- Service de Chimie Bio-organique et Marquage (SCBM)CEA, Université Paris-Saclay 91191 Gif-sur-Yvette France
| | - Egor Chirkin
- Service de Chimie Bio-organique et Marquage (SCBM)CEA, Université Paris-Saclay 91191 Gif-sur-Yvette France
| | - Lydia Rhyman
- Computational Chemistry GroupDepartment of ChemistryFaculty of ScienceUniversity of Mauritius Réduit 80837 Mauritius
- Department of Chemical SciencesUniversity of Johannesburg Doornfontein Johannesburg 2028 South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry GroupDepartment of ChemistryFaculty of ScienceUniversity of Mauritius Réduit 80837 Mauritius
- Department of Chemical SciencesUniversity of Johannesburg Doornfontein Johannesburg 2028 South Africa
| | - Jean‐Christophe Cintrat
- Service de Chimie Bio-organique et Marquage (SCBM)CEA, Université Paris-Saclay 91191 Gif-sur-Yvette France
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Edis Z, Haj Bloukh S, Abu Sara H, Bhakhoa H, Rhyman L, Ramasami P. "Smart" Triiodide Compounds: Does Halogen Bonding Influence Antimicrobial Activities? Pathogens 2019; 8:E182. [PMID: 31658760 PMCID: PMC6963602 DOI: 10.3390/pathogens8040182] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 09/27/2019] [Accepted: 10/08/2019] [Indexed: 11/17/2022] Open
Abstract
Antimicrobial agents containing symmetrical triiodides complexes with halogen bonding may release free iodine molecules in a controlled manner. This happens due to interactions with the plasma membrane of microorganisms which lead to changes in the structure of the triiodide anion. To verify this hypothesis, the triiodide complex [Na(12-crown-4)2]I3 was prepared by an optimized one-pot synthesis and tested against 18 clinical isolates, 10 reference strains of pathogens and five antibiotics. The antimicrobial activities of this symmetrical triiodide complex were determined by zone of inhibition plate studies through disc- and agar-well-diffusion methods. The triiodide complex proved to be a broad spectrum microbicidal agent. The biological activities were related to the calculated partition coefficient (octanol/water). The microstructural analysis of SEM and EDS undermined the purity of the triiodide complex. The anionic structure consists of isolated, symmetrical triiodide anions [I-I-I]- with halogen bonding. Computational methods were used to calculate the energy required to release iodine from [I-I-I]- and [I-I···I]-. The halogen bonding in the triiodide ion reduces the antibacterial activities in comparison to the inhibitory actions of pure iodine but increases the long term stability of [Na(12-crown-4)2]I3.
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Affiliation(s)
- Zehra Edis
- College of Pharmacy and Health Science, Ajman University, Ajman P.O. Box 346, UAE.
| | - Samir Haj Bloukh
- College of Pharmacy and Health Science, Ajman University, Ajman P.O. Box 346, UAE.
| | - Hamed Abu Sara
- College of Pharmacy and Health Science, Ajman University, Ajman P.O. Box 346, UAE.
| | - Hanusha Bhakhoa
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius.
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius.
- Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa.
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius.
- Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa.
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Peleyeju GB, Emmanuel T, Tata CM, Djuidje Fotsing MC, Niemann N, Rhyman L, Arderne C, Ndinteh DT, Ramasami P. Crystal structure and antibacterial activity of scandenone (warangalone) from Erythrina plants. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.04.070] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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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Obasi LN, Ezeorah JC, Ossai V, Jude A, Oruma US, Ibezim A, Lutter M, Rhyman L, Jurkschat K, Dege N, Ramasami P. Structural, computational and in silico studies of Schiff bases derived from 2,3-dihydroxybenzaldehyde and molecular structure of their zwitterionic forms. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kavitha HP, Rhyman L, Ramasami P. Molecular structure and vibrational spectra of 2-(4-bromophenyl)-3-(4-hydroxyphenyl) 1,3-thiazolidin-4-one and its selenium analogue: Insights using HF and DFT methods. Physical Sciences Reviews 2019. [DOI: 10.1515/psr-2018-0031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
2-(4-Bromophenyl)-3-(4-hydroxyphenyl)-1,3-thiazolidin-4-one and its selenium analogue were studied in the gas phase using HF and DFT methods. The functionals considered were B3LYP, BP86 and M06. The basis set for all the atoms was 6-311++ G(d,p). Molecular parameters such as bond lengths, bond angles, rotational constants, dipole moments, electronic energies, and vibrational parameters namely harmonic vibrational frequencies and relative intensities were computed for these compounds. Atomization energies, HOMO-LUMO gaps and natural charges on the atoms were also calculated. The molecular parameters and the vibrational spectra of sulfur compound are in good agreement with the experimental data. Therefore, the data for the selenium analogue should be helpful in its future characterization.
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Vivekanandam S, Muthunarayanan V, Muniraj S, Rhyman L, Alswaidan IA, Ramasami P. Ingenious bioorganic adsorbents for the removal of distillery based pigment-melanoidin: preparation and adsorption mechanism. Journal of Macromolecular Science, Part A 2019. [DOI: 10.1080/10601325.2018.1527180] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Swabna Vivekanandam
- Department of Environmental Biotechnology, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Vasanthy Muthunarayanan
- Department of Environmental Biotechnology, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Selvakumar Muniraj
- Department of Environmental Biotechnology, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius
- Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa
| | - Ibrahim A. Alswaidan
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius
- Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa
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Bhakhoa H, Rhyman L, Ramasami P. Theoretical study of the molecular aspect of the suspected novichok agent A234 of the Skripal poisoning. R Soc Open Sci 2019; 6:181831. [PMID: 30891291 PMCID: PMC6408395 DOI: 10.1098/rsos.181831] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 01/14/2019] [Indexed: 05/22/2023]
Abstract
Novichoks are the suspected nerve agents in the March 2018 Skripal poisoning. In this context, the novichok agent A234 (chemical structure proposed by Mirzayanov) was studied using computational methods to shed light on its molecular, electronic, spectroscopic, thermodynamic and toxicity parameters as well as on potential thermal and hydrolysis degradation pathways. The poisoning action and antidote of A234 were also investigated. Some of these parameters were compared to three common G- and V-series nerve agents, namely GB, VR and VX. The research findings should be useful towards the detection, development of antidotes and destruction of A234.
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Affiliation(s)
- Hanusha Bhakhoa
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
- Department of Applied Chemistry, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
- Department of Applied Chemistry, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
- Author for correspondence: Ponnadurai Ramasami e-mail:
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Bhowon MG, Jhaumeer Laulloo S, Hosten EC, Khodabaccus MM, Rhyman L, Ramasami P. Synthesis, spectroscopic, biological and DFT studies of new t-butyl substituted salicylaldimines having disulfide moiety. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.07.086] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Jadhav SD, Alswaidan IA, Rhyman L, Ramasami P, Sekar N. Effect of methoxy group on NLOphoric properties of fluorescent 7-arylstyryl-2-methoxyphenylimidazo[1,2-a]pyridine - Solvatochromic and computational method. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.07.010] [Citation(s) in RCA: 1] [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: 11/24/2022]
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Raikwar MM, Rhyman L, Ramasami P, Sekar N. Theoretical Investigation of Difluoroboron Complex of Curcuminoid Derivatives with and without Phenyl Substituent (at Meso Position): Linear and Non-Linear Optical Study. ChemistrySelect 2018. [DOI: 10.1002/slct.201802231] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Manish M. Raikwar
- Dyestuff Technology Department; Institute of Chemical Technology Nathalal Parekh Marg; Matunga, Mumbai 400019 India
| | - Lydia Rhyman
- Department of Chemistry; Computational Chemistry Group; Faculty of Science University of Mauritius; Réduit 80837 Mauritius
- Department of Applied Chemistry; University of Johannesburg; Doornfontein Campus; Johannesburg 2028 South Africa
| | - Ponnadurai Ramasami
- Department of Chemistry; Computational Chemistry Group; Faculty of Science University of Mauritius; Réduit 80837 Mauritius
- Department of Applied Chemistry; University of Johannesburg; Doornfontein Campus; Johannesburg 2028 South Africa
| | - Nagaiyan Sekar
- Dyestuff Technology Department; Institute of Chemical Technology Nathalal Parekh Marg; Matunga, Mumbai 400019 India
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Rhyman L, Tursun M, Abdallah HH, Choong YS, Parlak C, Kharkar P, Ramasami P. Theoretical investigation of the derivatives of favipiravir (T-705) as potential drugs for Ebola virus. Physical Sciences Reviews 2018. [DOI: 10.1515/psr-2017-0198] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Abstract
Density functional theory (DFT) method was used to compute the structural and vibrational parameters of favipiravir (T-705) in the gas phase. The functional used was B3LYP in conjuction with the 6–311++G(d,p) basis set. We also computed these parameters for unsubstituted T-705 and derivatives of T-705 by substituting fluorine by chlorine, bromine and the cyanide group. There is a good comparison between the computed and experimental parameters for T-705 and therefore, the predicted data should be reliable for the other compounds for which experimental data is not available. We extended our DFT study to include molecular docking involving the Ebola virus viral protein 35 (VP35). The docking results indicate that the T-705 and its chlorine and bromine analogues have comparable free energy of binding with VP35.
Graphical Abstract:
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Laloo JZA, Savoo N, Laloo N, Rhyman L, Ramasami P. ExcelAutomat 1.3: Fragment analysis based on the distortion/interaction-activation strain model. J Comput Chem 2018; 40:619-624. [DOI: 10.1002/jcc.25546] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 06/27/2018] [Accepted: 07/07/2018] [Indexed: 12/15/2022]
Affiliation(s)
- Jalal Z. A. Laloo
- Computational Chemistry Group, Department of Chemistry, Faculty of Science; University of Mauritius; Réduit 80837 Mauritius
| | - Nandini Savoo
- Computational Chemistry Group, Department of Chemistry, Faculty of Science; University of Mauritius; Réduit 80837 Mauritius
| | - Nassirah Laloo
- School of Innovative Technologies and Engineering, Department of Creative Arts, Film and Media Technologies, University of Technology; Mauritius, La Tour Koenig, Pointe-aux-Sables 11129 Mauritius
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science; University of Mauritius; Réduit 80837 Mauritius
- Department of Applied Chemistry; University of Johannesburg, Doornfontein Campus; Johannesburg 2028 South Africa
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science; University of Mauritius; Réduit 80837 Mauritius
- Department of Applied Chemistry; University of Johannesburg, Doornfontein Campus; Johannesburg 2028 South Africa
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