1
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Ibanescu A, Olariu DI, Lutic D, Hulea V, Dragoi B. Engineering the Morphostructural Properties and Drug Loading Degree of Organic-Inorganic Fluorouracil-MgAl LDH Nanohybrids by Rational Control of Hydrothermal Treatment. ACS OMEGA 2023; 8:26102-26121. [PMID: 37521604 PMCID: PMC10372945 DOI: 10.1021/acsomega.3c02288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 06/13/2023] [Indexed: 08/01/2023]
Abstract
Layered double hydroxides (LDHs) or hydrotalcite-like compounds have attracted great attention for the delivery of anticancer drugs due to their 2D structure, exhibiting a high surface-to-volume ratio and a high chemical versatility. The drug is protected between the layers from which it is slowly released, thus increasing the therapeutic effect and minimizing the side effects associated to nonspecific targeting. This work aimed to design LDHs with Mg and Al (molar ratio of 2/1) in brucite-like layers, which retained fluorouracil (5-FU; 5-FU/Al = 1, molar ratio) in the interlayer gallery as the layers grow during the co-precipitation step of the synthesis. To rationally control the physicochemical properties, particularly the size of the crystallites, the aging step following the co-precipitation was performed under carefully controlled conditions by changing the time and temperature (i.e., 25 °C for 16 h, 100 °C for 16 h, and 120 °C for 24 h). The results revealed the achievement of the control of the size of the crystals, which are gathered in three different agglomeration systems, from tight to loose, as well as the loading degree of the drug in the final organic-inorganic hybrid nanomaterials. The role played by the factors and parameters affecting the drug-controlled release was highlighted by assessing the release behavior of 5-FU by changing the pH, solid mass/volume ratio, and ionic strength. The results showed a pH-dependent behavior but not necessarily in a direct proportionality. After a certain limit, the mass of the solid diminishes the rate of release, whereas the ionic strength is essential for the payload discharge.
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Affiliation(s)
- Alina Ibanescu
- TRANSCEND
Research Center, Regional Institute of Oncology, 2-4 General Henri Mathias Berthelot, 700483 Iasi, Romania
- Faculty
of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73 Prof. D. Mangeron Bvd., 700050 Iasi, Romania
| | - Dragos-Ioan Olariu
- TRANSCEND
Research Center, Regional Institute of Oncology, 2-4 General Henri Mathias Berthelot, 700483 Iasi, Romania
- Faculty
of Chemistry, Al. I. Cuza University, 11-Carol I Bvd., 700506 Iasi, Romania
| | - Doina Lutic
- TRANSCEND
Research Center, Regional Institute of Oncology, 2-4 General Henri Mathias Berthelot, 700483 Iasi, Romania
- Faculty
of Chemistry, Al. I. Cuza University, 11-Carol I Bvd., 700506 Iasi, Romania
| | - Vasile Hulea
- Institut
Charles Gerhardt Montpellier, UMR 5253, CNRS-UM-ENSCM,Montpellier 34296, France
| | - Brindusa Dragoi
- TRANSCEND
Research Center, Regional Institute of Oncology, 2-4 General Henri Mathias Berthelot, 700483 Iasi, Romania
- Faculty
of Chemistry, Al. I. Cuza University, 11-Carol I Bvd., 700506 Iasi, Romania
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2
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Ferrando R, Mitchell SG, Atrián-Blasco E, Cerrada E. Antibacterial properties of phosphine gold(I) complexes with 5-fluorouracil. Dalton Trans 2023. [PMID: 37448318 DOI: 10.1039/d3dt01159c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/15/2023]
Abstract
New gold(I) complexes with coordination to 5-fluorouracil (5-FU), an anticancer drug with antibacterial properties, have been synthesised and characterised, and are the first reported examples of 5-FU-Au compounds. These new complexes show high solution stability, even in the presence of a cysteine derivative, and so were evaluated as antibacterial compounds against model Gram-positive and Gram-negative bacteria. All the complexes show excellent antibacterial activity against Gram-positive B. subtilis, most of them improving the activity of 5-FU alone. Furthermore, these new complexes are also active against Gram-negative E. coli, where [Au(5-FU)(PTA)], the complex with the smallest phosphane, is the most bactericidal, 32 times more active than 5-FU on its own.
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Affiliation(s)
- Ricardo Ferrando
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea-ISQCH, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain.
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
| | - Scott G Mitchell
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Elena Atrián-Blasco
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
| | - Elena Cerrada
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea-ISQCH, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain.
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3
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Icsel C, Yilmaz VT, Aygun M, Erkisa M, Ulukaya E. Water-soluble copper(II) 5-fluorouracil complexes bearing polypyridyl co-ligands: synthesis, structures and anticancer activity. Dalton Trans 2023; 52:7048-7058. [PMID: 36939483 DOI: 10.1039/d3dt00363a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2023]
Abstract
Five newly synthesized copper(II) 5-fluorouracil (5-FU) complexes of polypyridyl co-ligands with good solubility in water, namely [CuCl(5-FU)(bpy)(DMSO)] (1), [Cu(5-FU)(phen)2](5-FU)·4H2O (2), [Cu(5-FU)(dpya)2](NO3)·2.5H2O (3), [Cu(5-FU)(NO3)(bpyma)]·H2O (4) and [CuCl(5-FU)(terpy)] (5) (bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline, dpya = 2,2'-dipyridylamine, bpyma = bis(2-pyridylmethyl)amine and terpy = 2,2';6',2''-terpyridine), were characterized by elemental analysis and a number of spectrometric methods. The structures of complexes 1-5 were determined by X-ray crystallography and the copper(II) ions were five coordinate. Cytotoxic activity of the complexes in four human cancer cell lines, A549 (lung carcinoma), MDA-MB-231 (breast carcinoma), HCT116 (colon carcinoma) and DU145 (prostate carcinoma), and a normal cell line, BEAS-2B (human lung epithelial), was determined by SRB assay and compared with that of 5-FU and cisplatin. The complexation of 5-FU together with polypyridyl ligands resulted in a significant increase in the cytotoxicity of the complexes, with complex 2 exhibiting the highest anticancer potency against all the cell lines, with HCT116 being the most sensitive. The mode of action of cell death for 2 was investigated using morphological imaging and cytometric analyses, including the capacity for induction of apoptosis, generation of reactive oxygen species, mitochondrial dysfunction and DNA damage.
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Affiliation(s)
- Ceyda Icsel
- Department of Chemistry, Faculty of Sciences, Karadeniz Technical University, 61080 Trabzon, Turkey.
| | - Veysel T Yilmaz
- Department of Chemistry, Faculty of Sciences, Karadeniz Technical University, 61080 Trabzon, Turkey.
| | - Muhittin Aygun
- Department of Physics, Faculty of Sciences, Dokuz Eylul University, 35210 Izmir, Turkey
| | - Merve Erkisa
- Molecular Cancer Research Center (ISUMKAM), Istinye University, 34010 Istanbul, Turkey
| | - Engin Ulukaya
- Molecular Cancer Research Center (ISUMKAM), Istinye University, 34010 Istanbul, Turkey.,Department of Clinical Biochemistry, Medical School of Istinye University, 34010 Istanbul, Turkey
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4
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Ostakhov SS, Kayumova RR, Akhiyarov AA, Ivanov SP, Khursan SL. Spectral-Luminescent Study of the Acid–Base Equilibrium of 5-Aminouracil and 6-Aminouracil in Aqueous Solutions. HIGH ENERGY CHEMISTRY 2023. [DOI: 10.1134/s0018143923010101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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5
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Szota M, Wolski P, Carucci C, Marincola FC, Gurgul J, Panczyk T, Salis A, Jachimska B. Effect of Ionization Degree of Poly(amidoamine) Dendrimer and 5-Fluorouracil on the Efficiency of Complex Formation-A Theoretical and Experimental Approach. Int J Mol Sci 2023; 24:ijms24010819. [PMID: 36614260 PMCID: PMC9821593 DOI: 10.3390/ijms24010819] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 12/23/2022] [Accepted: 12/25/2022] [Indexed: 01/05/2023] Open
Abstract
Due to their unique structure, poly(amidoamine) (PAMAM) dendrimers can bind active ingredients in two ways: inside the structure or on their surface. The location of drug molecules significantly impacts the kinetics of active substance release and the mechanism of internalization into the cell. This study focuses on the effect of the protonation degree of the G4PAMAM dendrimer and the anticancer drug 5-fluorouracil (5FU) on the efficiency of complex formation. The most favorable conditions for constructing the G4PAMAM-5FU complex are a low degree of protonation of the dendrimer molecule with the drug simultaneously present in a deprotonated form. The fluorine components in the XPS spectra confirm the formation of the stable complex. Through SAXS and DLS methods, a decrease in the dendrimer's molecular size resulting from protonation changes at alkaline conditions was demonstrated. The gradual closure of the dendrimer structure observed at high pH values makes it difficult for the 5FU molecules to migrate to the interior of the support structure, thereby promoting drug immobilization on the surface. The 1H NMR and DOSY spectra indicate that electrostatic interactions determine the complex formation process. Through MD simulations, the localization profile and the number of 5FU molecules forming the complex were visualized on an atomic scale.
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Affiliation(s)
- Magdalena Szota
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, 30-239 Krakow, Poland
| | - Pawel Wolski
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, 30-239 Krakow, Poland
| | - Cristina Carucci
- Department of Chemical and Geological Sciences, University of Cagliari, 09042 Cagliari, Italy
| | | | - Jacek Gurgul
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, 30-239 Krakow, Poland
| | - Tomasz Panczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, 30-239 Krakow, Poland
| | - Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari, 09042 Cagliari, Italy
| | - Barbara Jachimska
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, 30-239 Krakow, Poland
- Correspondence:
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Ugorji OL, Umeh ONC, Agubata CO, Adah D, Obitte NC, Chukwu A. The effect of noisome preparation methods in encapsulating 5-fluorouracil and real time cell assay against HCT-116 colon cancer cell line. Heliyon 2022; 8:e12369. [PMID: 36582708 PMCID: PMC9793284 DOI: 10.1016/j.heliyon.2022.e12369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 10/17/2022] [Accepted: 12/08/2022] [Indexed: 12/23/2022] Open
Abstract
The formulation of niosomes is influenced by a number of variables, and these variables may eventually affect the formulation's outcome. One of the elements that can influence the physico-chemical properties of niosomes is the method used in preparation of the formulation. In this study, we established if various methods of preparation have any impact on the prepared vesicles when loaded with 5-fluorouracil. Thereafter, a real-time cell assay (an in vitro cytotoxicity test) against HCT-116 colon cancer cell lines was done on an optimised batch. 5-fluorouracil loaded niosomes were prepared with either Tween 60 or Span 60 by four different methods - namely thin film hydration (TFH), reverse phase evaporation (RPE), evaporation/sonication (EVP/SON), and the ethanol injection method (EIM). In vitro evaluations were done on the formulations, and these included particle size analysis, entrapment efficiency, scanning electron microscopy (SEM), photomicrography, drug release, polydispersity index, and Fourier transform infrared spectroscopy (FTIR). The effects of the preparation method and type of non-ionic surfactants on encapsulation efficiency, particle size, and in vitro drug release of the niosomes at pH 7.4 were evaluated. An in vitro cytotoxicity test (real time cell assay (RTCA)) against HCT-116 cells was carried out using the optimised formulation. Results showed physically stable formulations. The TFH method produced the smallest particle sizes (187 nm and 482 nm), while the EVP/SON method produced the largest particle sizes (4476 nm and 9111 nm). The Tween-based niosomes prepared by TFH or RPE had higher drug entrapment. The FTIR studies of niosomal formulations showed broad peaks at wavenumbers above 3000 cm-1, indicating strong hydrogen bonds. The RTCA showed 5-fluorouracil-loaded niosomes caused more sustained cell death compared to the pure drug and blank niosomes. The methods of preparation affected the particle size, polydispersity index, entrapment efficiency, and the physical stability of the vesicles. The thin film hydration method was more robust in the entrapped 5-fluorouracil and showed lower particle sizes when compared to all the other methods. RTCA showed sustained cell death in real time.
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Affiliation(s)
- Onyinyechi Lydia Ugorji
- Department of Pharmaceutical Technology and Industrial Pharmacy, University of Nigeria, Nsukka, Nigeria,Corresponding author.
| | | | - Chukwuma Obumneme Agubata
- Department of Pharmaceutical Technology and Industrial Pharmacy, University of Nigeria, Nsukka, Nigeria
| | - Dickson Adah
- Department of Cancer Immunology, Clinical research center Lund University, Malmo, Sweden
| | - Nicholas Chinedu Obitte
- Department of Pharmaceutical Technology and Industrial Pharmacy, University of Nigeria, Nsukka, Nigeria
| | - Amarauche Chukwu
- Department of Pharmaceutical Technology and Industrial Pharmacy, University of Nigeria, Nsukka, Nigeria
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7
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Ostakhov SS, Abdrakhimova GS, Kayumova RR, Ivanov SP, Khursan SL. Spectral–Luminescent and Spectrophotometric Study of Molecular and Anionic Forms of N-Methyl Derivatives of 5-Fluorouracil in Aqueous Solutions. HIGH ENERGY CHEMISTRY 2022. [DOI: 10.1134/s0018143922030080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Icsel C, Yilmaz VT, Aygun M, Erkisa M, Ulukaya E. Novel 5-fluorouracil complexes of Zn(II) with pyridine-based ligands as potential anticancer agents. Dalton Trans 2022; 51:5208-5217. [PMID: 35275157 DOI: 10.1039/d1dt04070g] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A series of novel Zn(II) complexes of 5-fluorouracilate (5-FU), namely [Zn(5-FU)2(bpy)] (1), [Zn(5-FU)2(phen)] (2), [Zn(5-FU)2(dpya)]·H2O (3), [Zn(5-FU)2(bpyma)]·2H2O (4) and [Zn(5-FU)2(terpy)]·H2O (5), were synthesized and structurally characterized by spectroscopic methods and X-ray crystallography. 5-FU was coordinated to Zn(II) via the deprotonated N3 site and also presented the N1 and N3 linkage isomerism in 4 and 5 due to its tautomerism. The antiproliferative activity of the complexes was studied against lung (A549), breast (MDA-MB-231), colon (HCT116) and prostate (DU145) cancer cell lines. Complexes 1, 4 and 5 except 2 and 3 showed potent growth inhibitory activity towards selected cancer cells. Remarkably, 4 was highly cytotoxic towards A549 and MDA-MB-231 cell lines, being more active than the clinical drugs cisplatin and 5-FU. In addition, 4 was not toxic to normal lung cells (BEAS-2B). The complex exhibited a significantly high affinity towards DNA as assessed by gel electrophoresis and DNA docking. The mechanistic studies of 4 in A549 cells indicated that the complex induced apoptotic cell death as evidenced via caspase 3/7 activity, Bcl2 inactivation, annexin V and DAPI/PI staining. 4 further elevated the levels of reactive oxygen species (ROS), depolarized mitochondria and enhanced the expression of γ-H2AX, thus contributing to its remarkable anticancer activity.
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Affiliation(s)
- Ceyda Icsel
- Department of Chemistry, Faculty of Arts and Sciences, Bursa Uludag University, 16059 Bursa, Turkey.
| | - Veysel T Yilmaz
- Department of Chemistry, Faculty of Arts and Sciences, Bursa Uludag University, 16059 Bursa, Turkey.
| | - Muhittin Aygun
- Department of Physics, Faculty of Sciences, Dokuz Eylul University, 35210 Izmir, Turkey
| | - Merve Erkisa
- Molecular Cancer Research Center (ISUMKAM), Istinye University, 34010 Istanbul, Turkey
| | - Engin Ulukaya
- Molecular Cancer Research Center (ISUMKAM), Istinye University, 34010 Istanbul, Turkey
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9
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Calorimetric and spectroscopic studies of interactions of PPI G4 dendrimer with tegafur in aqueous solutions. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Akhiyarov AA, Gubaidullina LM, Saifina LF, Semenov VE, Ramazanova LA, Lobov AN, Faizrakhmanov IS, Alekhina IE, Ivanov SP. Acid-Base Equilibrium of a 6-Methyluracil Derivative with 1,2,3-Triazole Fragment in Aqueous Solutions. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2021. [DOI: 10.1134/s0036024421020035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Halogenation and nitration of 1-carboxymethyl-5-methyluracil. Halophilic reaction involving acetic anhydride. Russ Chem Bull 2020. [DOI: 10.1007/s11172-020-3015-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Rzepiela K, Buczek A, Kupka T, Broda MA. Factors Governing the Chemical Stability and NMR Parameters of Uracil Tautomers and Its 5-Halogen Derivatives. Molecules 2020; 25:E3931. [PMID: 32872098 PMCID: PMC7504704 DOI: 10.3390/molecules25173931] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 08/21/2020] [Accepted: 08/26/2020] [Indexed: 01/10/2023] Open
Abstract
We report on the density functional theory (DFT) modelling of structural, energetic and NMR parameters of uracil and its derivatives (5-halogenouracil (5XU), X = F, Cl, Br and I) in vacuum and in water using the polarizable continuum model (PCM) and the solvent model density (SMD) approach. On the basis of the obtained results, we conclude that the intramolecular electrostatic interactions are the main factors governing the stability of the six tautomeric forms of uracil and 5XU. Two indices of aromaticity, the harmonic oscillator model of aromaticity (HOMA), satisfying the geometric criterion, and the nuclear independent chemical shift (NICS), were applied to evaluate the aromaticity of uracil and its derivatives in the gas phase and water. The values of these parameters showed that the most stable tautomer is the least aromatic. A good performance of newly designed xOPBE density functional in combination with both large aug-cc-pVQZ and small STO(1M)-3G basis sets for predicting chemical shifts of uracil and 5-fluorouracil in vacuum and water was observed. As a practical alternative for calculating the chemical shifts of challenging heterocyclic compounds, we also propose B3LYP calculations with small STO(1M)-3G basis set. The indirect spin-spin coupling constants predicted by B3LYP/aug-cc-pVQZ(mixed) method reproduce the experimental data for uracil and 5-fluorouracil well.
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Affiliation(s)
| | | | - Teobald Kupka
- Department of Physical Chemistry and Molecular Modeling, Faculty of Chemistry, University of Opole, 48 Oleska Street, 45−052 Opole, Poland; (K.R.); (A.B.)
| | - Małgorzata A. Broda
- Department of Physical Chemistry and Molecular Modeling, Faculty of Chemistry, University of Opole, 48 Oleska Street, 45−052 Opole, Poland; (K.R.); (A.B.)
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13
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Ivanov SP, Ostakhov SS, Abdrakhimova GS, Akhiyarov AA, Khursan SL. On the use of the spectral luminescent method for studying acid-base equilibria of uracil derivatives in aqueous solutions. Biophys Chem 2020; 266:106432. [PMID: 32771804 DOI: 10.1016/j.bpc.2020.106432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 07/07/2020] [Accepted: 07/11/2020] [Indexed: 11/20/2022]
Abstract
The effect of pH on fluorescence parameters (spectral composition, intensity Ifl, and quantum yield φ) of thymine (T), 5-fluorouracil (FU) and 6-aminouracil (AU) have been investigated in aqueous solutions. As found, there is the regularity of the changes in the spectral composition, intensity, and quantum yields of uracil fluorescence depending on pH. The constants of the acid-base equilibria of uracils (pKa) determined by the fluorescence titration method are: 9.9 (T), 8.0 (FU), and 9.1 (AU) at 298 K. These pKa1 values satisfactorily agree with the previous estimates obtained by independent experimental or quantum chemical methods. The possibilities of the spectral fluorescence method for the quantitative description of the acid-base equilibria of uracils depending on the fluorescent features of the pyrimidinedione and its conjugate base are discussed.
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Affiliation(s)
- Sergey P Ivanov
- Ufa Institute of Chemistry, Ufa Federal Research Center of the Russian Academy of Sciences, 71 Prospekt Oktyabrya, 450054 Ufa, Russian Federation.
| | - Sergei S Ostakhov
- Ufa Institute of Chemistry, Ufa Federal Research Center of the Russian Academy of Sciences, 71 Prospekt Oktyabrya, 450054 Ufa, Russian Federation
| | - Gulnaz S Abdrakhimova
- Ufa Institute of Chemistry, Ufa Federal Research Center of the Russian Academy of Sciences, 71 Prospekt Oktyabrya, 450054 Ufa, Russian Federation
| | - Aidar A Akhiyarov
- Ufa Institute of Chemistry, Ufa Federal Research Center of the Russian Academy of Sciences, 71 Prospekt Oktyabrya, 450054 Ufa, Russian Federation
| | - Sergey L Khursan
- Ufa Institute of Chemistry, Ufa Federal Research Center of the Russian Academy of Sciences, 71 Prospekt Oktyabrya, 450054 Ufa, Russian Federation
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14
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Loading of 5-fluorouracil onto Halloysite nanotubes for targeted drug delivery using a subcritical gas antisolvent process (GAS). J Supercrit Fluids 2020. [DOI: 10.1016/j.supflu.2020.104756] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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15
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Anandhan K, Cerón M, Ceballos P, Ramos‐Hernández R, Perumal V, Pérez‐Gutiérrez E, Sosa‐Rivadeneyra M, Thamotharan S, Percino MJ. 1
H‐NMR, Photophysical, and pH Studies of 4‐(4,5‐Diphenyl‐1
H
‐imidazol‐2‐yl)benzaldehyde through Experimental and DFT Theoretical Analysis. ChemistrySelect 2020. [DOI: 10.1002/slct.201904505] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Karnambaram Anandhan
- Benemérita Universidad Autónoma de Puebla, Val-3, Ecocampus, Valsequillo independencia O2 Sur 50, San Pedro Zacachimalpa, Pue México
| | - Margarita Cerón
- Benemérita Universidad Autónoma de Puebla, Val-3, Ecocampus, Valsequillo independencia O2 Sur 50, San Pedro Zacachimalpa, Pue México
| | - Paulina Ceballos
- Benemérita Universidad Autónoma de Puebla, Val-3, Ecocampus, Valsequillo independencia O2 Sur 50, San Pedro Zacachimalpa, Pue México
| | - Rodrigo Ramos‐Hernández
- Benemérita Universidad Autónoma de Puebla, Val-3, Ecocampus, Valsequillo independencia O2 Sur 50, San Pedro Zacachimalpa, Pue México
| | - Venkatesan Perumal
- Benemérita Universidad Autónoma de Puebla, Val-3, Ecocampus, Valsequillo independencia O2 Sur 50, San Pedro Zacachimalpa, Pue México
| | - Enrique Pérez‐Gutiérrez
- Benemérita Universidad Autónoma de Puebla, Val-3, Ecocampus, Valsequillo independencia O2 Sur 50, San Pedro Zacachimalpa, Pue México
| | | | - Subbiah Thamotharan
- Biomolecular Crystallography LaboratoryDepartment of Bioinformatics, School of Chemical and BiotechnologySASTRA Deemed University, Thanjavur 613 401 India
| | - M. Judith Percino
- Benemérita Universidad Autónoma de Puebla, Val-3, Ecocampus, Valsequillo independencia O2 Sur 50, San Pedro Zacachimalpa, Pue México
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16
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Wielińska J, Nowacki A, Liberek B. 5-Fluorouracil-Complete Insight into Its Neutral and Ionised Forms. Molecules 2019; 24:molecules24203683. [PMID: 31614932 PMCID: PMC6832121 DOI: 10.3390/molecules24203683] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 10/06/2019] [Accepted: 10/11/2019] [Indexed: 11/16/2022] Open
Abstract
5-Fluorouracil (5FU), a common anti-cancer drug, occurs in four tautomeric forms and possesses two potential sites of both protonation and deprotonation. Tautomeric and resonance structures of the ionized forms of 5FU create the systems of connected equilibriums. Since there are contradictory reports on the ionized forms of 5FU in the literature, complex theoretical studies on neutral, protonated and deprotonated forms of 5FU, based on the broad spectrum of DFT methods, are presented. These indicate that the O4 oxygen is more willingly protonated than the O2 oxygen and the N1 nitrogen is more willingly deprotonated than the N3 nitrogen in a gas phase. Such preferences are due to advantageous charge delocalization of the respective ions, which is demonstrated by the NBO and ESP analyses. In an aqueous phase, stability differences between respective protonated and deprotonated forms of 5FU are significantly diminished due to the competition between the mesomeric effect and solvation. The calculated pKa values of the protonated, neutral and singly deprotonated 5FU indicate that 5FU does not exist in the protonated and double-deprotonated forms in the pH range of 0–14. The neutral form dominates below pH 8 and the N1 deprotonated form dominates above pH 8.
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Affiliation(s)
- Justyna Wielińska
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland.
| | - Andrzej Nowacki
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland.
| | - Beata Liberek
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland.
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17
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Ostakhov SS, Ovchinnikov MY, Masyagutova GA, Khursan SL. Luminescent and DFT Study of Keto-Enol Tautomers of 5-Fluorouracil and Its Derivatives in Aqueous Solutions. J Phys Chem A 2019; 123:7956-7964. [PMID: 31442039 DOI: 10.1021/acs.jpca.9b04701] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fluorescence (FL) spectra were recorded and identified for the following 5-fluorouracil (FU) tautomers: 5-fluoropyrimidine-2,4(1H,3H)-dione (A), 5-fluoro-2-hydroxypyrimidine-4(3H)-one (B), and 5-fluoro-4-hydroxypyrimidine-2(1H)-one (D), as well as the corresponding tautomers A and D of 1-(tetrahydrofuranyl-2)-5-fluorouracil and 1-methyl-5-fluorouracil, tautomers A and B of 3-methyl-5-fluorouracil, and the diketo tautomer of 1,3-dimethyl-5-fluorouracil. It was shown that the FL of rare tautomers of FU derivatives occurs by the excitation of uracil homoassociates followed by intramolecular proton transfer (IPT), formation of a pair of rare tautomers, and radiative deactivation of one of them. The FL quantum yields φi were estimated. In the case of rare tautomers, the φi value includes the probability of IPT in the homoassociate, and density functional theory calculations in the TPSSTPSS/6-311+G(d,p) approximation were used to determine the relative energies of tautomers, associated FU forms, and their spectral properties that agree with the observed luminescence pattern.
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Affiliation(s)
- S S Ostakhov
- Ufa Institute of Chemistry , Ufa Federal Research Centre of the Russian Academy of Sciences , 71 Prospect Oktyabrya , 450054 Ufa , Russian Federation
| | - M Yu Ovchinnikov
- Ufa Institute of Chemistry , Ufa Federal Research Centre of the Russian Academy of Sciences , 71 Prospect Oktyabrya , 450054 Ufa , Russian Federation
| | - G A Masyagutova
- Ufa Institute of Chemistry , Ufa Federal Research Centre of the Russian Academy of Sciences , 71 Prospect Oktyabrya , 450054 Ufa , Russian Federation
| | - S L Khursan
- Ufa Institute of Chemistry , Ufa Federal Research Centre of the Russian Academy of Sciences , 71 Prospect Oktyabrya , 450054 Ufa , Russian Federation
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18
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Hok L, Ulm L, Tandarić T, Krivohlavek A, Šakić D, Vrček V. Chlorination of 5-fluorouracil: Reaction mechanism and ecotoxicity assessment of chlorinated products. CHEMOSPHERE 2018; 207:612-619. [PMID: 29843038 DOI: 10.1016/j.chemosphere.2018.05.140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 05/15/2018] [Accepted: 05/23/2018] [Indexed: 06/08/2023]
Abstract
What happens to drugs in the chlorinating environment? Degradation products may vary in pharmacological profiles and in ecotoxicity potentials compared to the parent compound. This study combines synthesis, NMR spectroscopy, quantum chemical calculations, and toxicity experiments on Daphnia magna to investigate chemical fate of antineoplastic drug 5-fluorouracil (5-FU) in chlorinated environment, which is common in waste-water treatment procedures, but also endogenous in activated neutrophils. A reduction of toxicity (EC50 after 48 h is 50% higher than for the parent 5-FU) was observed after the first chlorination step, in which a chlorohydrin 5-chloro-5-fluoro-6-hydroxy-5,6-dihydrouracil was formed. Further chlorination leads to N-chlorinated intermediate, that undergoes the pyrimidine ring opening reaction. The final product, 2-chloro-2-fluoro-3,3-dihydroxypropanoic acid was obtained after the loss of the chlorinated urea fragment. This is the most potent compound in the reaction sequence, with toxicity parameter EC50, after 48 h, more than twice lower compared to the parent 5-FU. Clearly, the contact time between chlorinating species and degradation products provide different ecotoxicological properties of reaction mixtures. Interplay between experimental and theoretical procedures, to properly describe reaction pathways and provide more information on toxicity profiles, is a way forward in environmental science research.
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Affiliation(s)
- Lucija Hok
- Faculty of Pharmacy and Biochemistry, University of Zagreb, Ante Kovačića 1, Zagreb, Croatia
| | - Lea Ulm
- Andrija Štampar Teaching Institute of Public Health, Mirogojska 16, Zagreb, Croatia
| | - Tana Tandarić
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, Zagreb, Croatia
| | - Adela Krivohlavek
- Andrija Štampar Teaching Institute of Public Health, Mirogojska 16, Zagreb, Croatia
| | - Davor Šakić
- Faculty of Pharmacy and Biochemistry, University of Zagreb, Ante Kovačića 1, Zagreb, Croatia
| | - Valerije Vrček
- Faculty of Pharmacy and Biochemistry, University of Zagreb, Ante Kovačića 1, Zagreb, Croatia.
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19
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Petrova SF, Nugumanov TR, Spirikhin LV, Murinov YI, Ivanov SP. Acid-Base Equilibrium of 5-Methoxy-6-methyluracil in Solutions: Evaluation of Content of Anionic Forms in Aqueous Alkaline Solution. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s107036321806004x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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20
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Ilyina MG, Khamitov EM, Mustafin AG, Khursan SL. A theoretical quantitative estimation of acidity of uracil and its derivatives through the p
K
a
values. J CHIN CHEM SOC-TAIP 2018. [DOI: 10.1002/jccs.201800087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Margarita G. Ilyina
- Department of ChemistryBashkir State University Ufa Russia
- Laboratory of Quantum Chemistry and Molecular Dynamics of the Department of Chemistry and TechnologyInstitute of Petroleum Refining and Petrochemistry Ufa Russia
| | - Edward M. Khamitov
- Department of ChemistryBashkir State University Ufa Russia
- Laboratory of Quantum Chemistry and Molecular Dynamics of the Department of Chemistry and TechnologyInstitute of Petroleum Refining and Petrochemistry Ufa Russia
- Russian Academy of Sciences, Laboratory of Chemical PhysicsUfa Institute of Chemistry Ufa Russia
| | - Akhat G. Mustafin
- Department of ChemistryBashkir State University Ufa Russia
- Russian Academy of Sciences, Laboratory of Chemical PhysicsUfa Institute of Chemistry Ufa Russia
| | - Sergey L. Khursan
- Russian Academy of Sciences, Laboratory of Chemical PhysicsUfa Institute of Chemistry Ufa Russia
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21
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Abdrakhimova G, Ovchinnikov M, Lobov A, Spirikhin L, Khursan S, Ivanov S. 5-Chlorouracil and 5-bromouracil acid-base equilibrium study in water and DMSO by NMR spectroscopy. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.01.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Petrova SF, Nugumanov TR, Lobov AN, Spirikhin LV, Murinov YI, Ivanov SP. Synthesis of Methyl-Substituted Derivatives of 5-Hydroxy-6-methyluracil. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s1070363218010231] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Ilyina MG, Khamitov EM, Ivanov SP, Mustafin AG, Khursan SL. Theoretical Models for Quantitative Description of the Acid-Base Equilibria of the 5,6-Substituted Uracils. J Phys Chem A 2018; 122:341-349. [PMID: 29215882 DOI: 10.1021/acs.jpca.7b09330] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The acidities of 18 5,6-substituted uracils have been numerically estimated as pKa values in terms of three theoretical models. The first scheme includes the calculation of the gas-phase acidity of uracil with the G3MP2B3 method and taking into account the solvent effect using the polarizable continuum approximation PCM(SMD)-TPSS/aug-cc-pVTZ. The second model is one step and implies calculation of the free Gibbs energies of the hydrate complex of uracil (and its anion) with 5 water molecules by the TPSS/aug-cc-pVTZ method. This model accounts for the solvent effect corresponding to both specific and nonspecific solvation. The third scheme required high time and computational resources and includes the strong features of the two previous schemes. Here, the theoretical estimation of pKa is performed by the CBS-QB3 composite method. As in the second approach, both specific (as pentahydrate) and nonspecific solvent effects are determined. We have analyzed the advantages and model restrictions of the considered schemes for the pKa calculations. All models have systematic errors, which have been corrected with the linear empirical regression relations. In the presented model, the absolute mean deviations of the pKa values of uracils dissociating via the N1-H bonds diminish to 0.25, 0.28, and 0.23 pKa units (respectively, for I, II, and III models), which corresponds to ∼0.3 kcal/mol on the energy scale. The applicability of our computational schemes to uracils dissociating via N3-H, O-H (orotic acids) and C-H bonds is discussed.
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Affiliation(s)
- Margarita G Ilyina
- Department of Physical Chemistry and Chemical Ecology, Bashkir State University Chemical Faculty , 32 Zaki Validi Street, Ufa 450074, Russia.,Laboratory of Quantum Chemistry and Molecular Dynamics of the Department of Chemistry and Technology, Institute of Petroleum Refining and Petrochemistry , 12 Initsiativnaya Street, Ufa 450065, Republic of Bashkortostan, Russia
| | - Edward M Khamitov
- Department of Physical Chemistry and Chemical Ecology, Bashkir State University Chemical Faculty , 32 Zaki Validi Street, Ufa 450074, Russia.,Ufa Institute of Chemistry, Russian Academy of Sciences, Laboratory of Chemical Physics , 69 Prospekt Oktyabrya, Ufa 450054, Russia.,Laboratory of Quantum Chemistry and Molecular Dynamics of the Department of Chemistry and Technology, Institute of Petroleum Refining and Petrochemistry , 12 Initsiativnaya Street, Ufa 450065, Republic of Bashkortostan, Russia
| | - Sergey P Ivanov
- Ufa Institute of Chemistry, Russian Academy of Sciences, Laboratory of Chemical Physics , 69 Prospekt Oktyabrya, Ufa 450054, Russia
| | - Akhat G Mustafin
- Department of Physical Chemistry and Chemical Ecology, Bashkir State University Chemical Faculty , 32 Zaki Validi Street, Ufa 450074, Russia.,Ufa Institute of Chemistry, Russian Academy of Sciences, Laboratory of Chemical Physics , 69 Prospekt Oktyabrya, Ufa 450054, Russia
| | - Sergey L Khursan
- Ufa Institute of Chemistry, Russian Academy of Sciences, Laboratory of Chemical Physics , 69 Prospekt Oktyabrya, Ufa 450054, Russia
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24
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Overview of experimental and computational methods for the determination of the pKa values of 5-fluorouracil, cyclophosphamide, ifosfamide, imatinib and methotrexate. Trends Analyt Chem 2017. [DOI: 10.1016/j.trac.2017.09.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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25
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Ilyina MG, Khamitov EM, Mustafin AG, Khursan SL. Controlled stabilization of anionic forms of the uracil derivatives: A DFT study. J Mol Graph Model 2017; 79:65-71. [PMID: 29145035 DOI: 10.1016/j.jmgm.2017.11.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 11/08/2017] [Accepted: 11/09/2017] [Indexed: 11/29/2022]
Abstract
Relative stabilities of the N1/N3/О5/О6 anions of 42 substituted uracils in gas phase and aqueous solutions have been theoretically studied using approximation IEFPCM (SMD) - TPSS/aug-cc-pVTZ. The specific solvation of uracil and its anions has been simulated with the first hydrate shell made up with 5 water molecules. The nonspecific solvation has been accounted in terms of the SMD model. We have found a series of relative stability under conditions of both specific and nonspecific hydration. The series is ranked according to the increase of the relative stability of the N3 anion. In gas phase, the N1 anion is significantly more stable than its N3 counterpart: the ΔGgas values vary in the range from 19.54 (5OH6СН3U) to 83.14 (5NO26NH2U) kJ/mol that is caused by a more effective delocalization of the excess charge through the uracil framework in the N1 anion. The hydration pronouncedly diminishes ΔG to the range from -0.02 (5OH6СН3U) to 38.16 (5Br6NO2U) kJ/mol due to the fact that the polar solvent is prone to stabilize more polar anionic states of uracils. Therefore, less polar uracil anions are more stable. We have defined the main factor influencing the N1/N3/О5/О6 distribution of anions, viz. the presence of the substituents in 5 and 6 positions of the pyrimidine ring. Herewith, the most favorable mechanism of the influence of 5-substituents has been previously defined as resonant whereas, as we found in this work, the inductive mechanism is more pronounced in the case of 6-substituents.
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Affiliation(s)
- Margarita G Ilyina
- Bashkir State University, Department of Chemistry, Chair of Physical Chemistry and Chemical Ecology, 32 Zaki Validi Str., Ufa 450074, Russia; Institute of Petroleum Refining and Petrochemistry, Laboratory of Quantum Chemistry and Molecular Dynamics of the Department of Chemistry and Technology, 12 Initsiativnaya Str., Ufa 450065, Republic of Bashkortostan, Russia.
| | - Edward M Khamitov
- Bashkir State University, Department of Chemistry, Chair of Physical Chemistry and Chemical Ecology, 32 Zaki Validi Str., Ufa 450074, Russia; Ufa Institute of Chemistry, Russian Academy of Sciences, Laboratory of Chemical Physics, 69 Prospekt Oktyabrya, Ufa 450054, Russia; Institute of Petroleum Refining and Petrochemistry, Laboratory of Quantum Chemistry and Molecular Dynamics of the Department of Chemistry and Technology, 12 Initsiativnaya Str., Ufa 450065, Republic of Bashkortostan, Russia
| | - Akhat G Mustafin
- Bashkir State University, Department of Chemistry, Chair of Physical Chemistry and Chemical Ecology, 32 Zaki Validi Str., Ufa 450074, Russia; Ufa Institute of Chemistry, Russian Academy of Sciences, Laboratory of Chemical Physics, 69 Prospekt Oktyabrya, Ufa 450054, Russia
| | - S L Khursan
- Ufa Institute of Chemistry, Russian Academy of Sciences, Laboratory of Chemical Physics, 69 Prospekt Oktyabrya, Ufa 450054, Russia
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26
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Ostakhov SS, Sultanbaev MV, Ovchinnikov MY, Kayumov RR, Khursan SL. Spectral-luminescence and quantum-chemical study of the anionic forms of 5-fluorouracil. HIGH ENERGY CHEMISTRY 2017. [DOI: 10.1134/s0018143917010076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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Kubica D, Molchanov S, Gryff-Keller A. Solvation of Uracil and Its Derivatives by DMSO: A DFT-Supported 1H NMR and 13C NMR Study. J Phys Chem A 2017; 121:1841-1848. [PMID: 28195476 DOI: 10.1021/acs.jpca.7b00144] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
1H NMR and 13C NMR spectra of uracil, thymine, 5-hydroxymethyluracil, 5,6-dihydrouracil, and 5,6-dihydrothymine in DMSO-d6 solutions have been measured. Additionally, molecular structures as well as NMR parameters of these compounds and their various solvates have been calculated using DFT B3LYP/6-311++G(2d,p) PCM(DMSO) method. The analysis of the chemical shift data for these compounds has shown that, indeed, in DMSO solutions they occur as equilibrium mixtures of free molecules and solvates in which solute and solvent molecules are joined by NH···O or OH···O hydrogen bonds. The populations of particular species present in the solutions have been estimated. Moreover, it has been found that 5,6-dihydrothymine exists in DMSO solution preferentially in conformation with the methyl group occupying the pseudoequatorial position. This finding is based on the molecular energy calculations and remains in full agreement with the interpretation of NMR data and theoretical calculations of NMR parameters.
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Affiliation(s)
- Dominika Kubica
- COBRO - Packaging Research Institute , Konstancińska 11, 02-942 Warsaw, Poland
| | - Sergey Molchanov
- Faculty of Chemistry, Warsaw University of Technology , Noakowskiego 3, 00-664 Warsaw, Poland
| | - Adam Gryff-Keller
- Faculty of Chemistry, Warsaw University of Technology , Noakowskiego 3, 00-664 Warsaw, Poland
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28
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29
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Wincel H. Microhydration of Deprotonated Nucleobases. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:1383-92. [PMID: 27178262 PMCID: PMC4942500 DOI: 10.1007/s13361-016-1411-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 04/17/2016] [Accepted: 04/19/2016] [Indexed: 06/05/2023]
Abstract
Hydration reactions of deprotonated nucleobases (uracil, thymine, 5-fluorouracil,2-thiouracil, cytosine, adenine, and hypoxanthine) produced by electrospray have been experimentally studied in the gas phase at 10 mbar using a pulsed ion-beam high-pressure mass spectrometer. The thermochemical data, ΔH (o) , ΔS (o) , and ΔG (o) , for the monohydrated systems were determined. The hydration enthalpies were found to be similar for all studied systems and varied between 39.4 and 44.8 kJ/mol. A linear correlation was found between water binding energies in the hydrated complexes and the corresponding acidities of the most acidic site of nucleobases. The structural and energetic aspects of the precursors for the hydrated complexes are discussed in conjunction with available literature data. Graphical Abstract ᅟ.
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Affiliation(s)
- Henryk Wincel
- Institute of Physical Chemistry, Polish Academy of Sciences, 01-224, Warsaw, Poland.
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30
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Ilyina MG, Khamitov EM, Ivanov SP, Mustafin AG, Khursan SL. Anions of uracils: N1 or N3? That is the question. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2015.12.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Brovarets' OO, Pérez-Sánchez H. Whether the amino–imino tautomerism of 2-aminopurine is involved into its mutagenicity? Results of a thorough QM investigation. RSC Adv 2016. [DOI: 10.1039/c6ra24277d] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
2AP* mutagenic tautomer is able to induce only one incorporation error – transversion – by pairing through the H-bonds into the G·2AP* mispair.
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Affiliation(s)
- Ol'ha O. Brovarets'
- Department of Molecular and Quantum Biophysics
- Institute of Molecular Biology and Genetics
- National Academy of Sciences of Ukraine
- 03680 Kyiv
- Ukraine
| | - Horacio Pérez-Sánchez
- Computer Science Department
- Bioinformatics and High Performance Computing (BIO-HPC) Research Group
- Universidad Católica San Antonio de Murcia (UCAM)
- Murcia
- Spain
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32
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Lapić J, Havaić V, Šakić D, Sanković K, Djaković S, Vrček V. Ferrocenoyl-Substituted Pyrimidine Nucleobases: An Experimental and Computational Study of Regioselective Acylation of Uracil, Thymine, and 5-Fluorouracil. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500647] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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