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Comparative study of different methodologies for the determination the antioxidant activity of Venezuelan propolis. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105244] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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2
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Gaber M, Khedr AM, Mansour MA, Elsharkawy M. Nano-synthesis, characterization, modeling and molecular docking analysis of Mn (II), Co (II), Cr (III) and Cu (II) complexes with azo pyrazolone ligand as new favorable antimicrobial and antitumor agents. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4606] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mohamed Gaber
- Chemistry Department, Faculty of Science; Tanta University; Tanta 31527 Egypt
| | - Abdalla M. Khedr
- Chemistry Department, Faculty of Science; Tanta University; Tanta 31527 Egypt
- Department of Chemistry, Faculty of Applied Science; Umm Al-Qura University; Makkah Saudi Arabia
| | - Mohammed A. Mansour
- Biochemistry Division, Chemistry Department, Faculty of Science; Tanta University; Tanta 31527 Egypt
- Institute of Cancer Sciences, University of Glasgow; Garscube Estate, Switchback Road Glasgow G61 1QH UK
| | - Mohsen Elsharkawy
- Chemistry Department, Faculty of Science; Tanta University; Tanta 31527 Egypt
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Tao Z, Gomha SM, Badrey MG, El-Idreesy TT, Eldebss TMA. Novel 4-Heteroaryl-antipyrines: Synthesis, Molecular Docking, and Evaluation as Potential Anti-breast Cancer Agents. J Heterocycl Chem 2018. [DOI: 10.1002/jhet.3305] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Ziqi Tao
- Nanjing University of Chinese Medicine; XuZhou Central Hospital; XuZhou China
| | - Sobhi M. Gomha
- Department of Chemistry, Faculty of Science; Cairo University; Giza 12613 Egypt
| | - Mohamed G. Badrey
- Department of Chemistry, Faculty of Science; Fayoum University; Fayoum 63514 Egypt
| | - Tamer T. El-Idreesy
- Department of Chemistry, Faculty of Science; Cairo University; Giza 12613 Egypt
- Department of Chemistry, School of Sciences and Engineering; The American University in Cairo; New Cairo 11835 Egypt
| | - Taha M. A. Eldebss
- Department of Chemistry, Faculty of Science; Cairo University; Giza 12613 Egypt
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Hamama WS, Gouda MA, Kamal El-din HA, Zoorob HH. Synthesis and Antioxidant Activity of Some New Binary Pyrazoles Containing Core Phenothiazine Moiety. J Heterocycl Chem 2016. [DOI: 10.1002/jhet.2716] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Wafaa S. Hamama
- Department of Chemistry, Faculty of Science; Mansoura University; El-Gomhoria Street 35516 Mansoura Egypt
| | - Moustafa A. Gouda
- Department of Chemistry, Faculty of Science; Mansoura University; El-Gomhoria Street 35516 Mansoura Egypt
- Department of Chemistry, Faculty of Science and Arts, Ulla; Taibah University; Medina Kingdom of Saudi Arabia
| | - Hadwah A. Kamal El-din
- Department of Chemistry, Faculty of Science; Mansoura University; El-Gomhoria Street 35516 Mansoura Egypt
| | - Hanafi H. Zoorob
- Department of Chemistry, Faculty of Science; Mansoura University; El-Gomhoria Street 35516 Mansoura Egypt
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Gouda MA. Synthesis and Antioxidant Evaluation of Some New Pyridopyrazolotriazine Derivatives. J Heterocycl Chem 2015. [DOI: 10.1002/jhet.2045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Moustafa A. Gouda
- Department of Chemistry, Faculty of Science; Mansoura University; El-Gomhoria Street 35516 Mansoura Egypt
- Department of Chemistry, Faculty of Science and Arts, Ulla; Taibah University; Saudi Arabia
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Pisoschi AM, Cimpeanu C, Predoi G. Electrochemical Methods for Total Antioxidant Capacity and its Main Contributors Determination: A review. OPEN CHEM 2015. [DOI: 10.1515/chem-2015-0099] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractBackround: The present review focuses on electrochemical methods for antioxidant capacity and its main contributors assessment. The main reactive oxygen species, responsible for low density lipoprotein oxidation, and their reactivity are reminded. The role of antioxidants in counteracting the factors leading to oxidative stress-related degenerative diseases occurence, is then discussed. Antioxidants can scavenge free radicals, can chelate pro-oxidative metal ions, or quench singlet oxygen. When endogenous factors (uric acid, bilirubin, albumin, metallothioneins, superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glutathione-S-transferase) cannot accomplish their protective role against reactive oxygen species, the intervention of exogenous antioxidants (vitamin C, tocopherols, flavonoids, carotenoids etc) is required, as intake from food, as nutritional supplements or as pharmaceutical products.Literature study: The main advantages of electrochemical methods with respect to traditional, more laborious instrumental techniques are described: sensitivity, rapidity, simplicity of the applied analytical procedure which does not require complicated sample pre-treatment etc.The paper reviews minutiously the voltammetric, amperometric, biamperometric, potentiometric and coulometric methods for total antioxidant capacity estimation. For each method presented, the electroactivity and the mechanism of electro-oxidation of antioxidant molecules at various electrodes, as well as the influences on the electroactive properties are discussed. The characteristics of the developed methods are viewed from the perspective of the antioxidant molecule structure influence, as well as from the importance of electrode material and/or surface groups standpoint.The antioxidant molecule-electrode surface interaction, the detection system chosen, the use of modifiers, as well as the nature of the analysed matrix are the factors discussed, which influence the performances of the studied electrochemical techniques.Conclusions: The electrochemical methods reviewed in this paper allow the successful determination of the total antioxidant capacity and of its main contributors in various media: foodstuffs and beverages, biological fluids, pharmaceuticals. The advantages and disadvantages of the electrochemical methods applied to antioxidant content and antioxidant activity assay are treated and interpreted, in the case of various analysed matrixes. Combining advanced materials with classical electrode construction, provides viable results and can constitute an alternative for the future.
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Synthesis, antitumor, cytotoxic and antioxidant evaluation of some new pyrazolotriazines attached to antipyrine moiety. Eur J Med Chem 2012; 56:254-62. [DOI: 10.1016/j.ejmech.2012.08.034] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 06/11/2012] [Accepted: 08/22/2012] [Indexed: 12/28/2022]
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Korotkova EI, Voronova OA, Dorozhko EV. Study of antioxidant properties of flavonoids by voltammetry. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1707-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Remes C, Paun A, Zarafu I, Tudose M, Caproiu MT, Ionita G, Bleotu C, Matei L, Ionita P. Chemical and biological evaluation of some new antipyrine derivatives with particular properties. Bioorg Chem 2012; 41-42:6-12. [PMID: 22257969 DOI: 10.1016/j.bioorg.2011.12.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Accepted: 12/26/2011] [Indexed: 12/01/2022]
Abstract
Starting from 4-amino-antipyrine, six new compounds were synthesized and characterized. The new compounds contain moieties with particular properties, such are ionophore (benzo-15-crown-5), fluorescent (nitrobenzofurazan), stable free radical (nitroxide), or other types of biological active residues, like nitroderivatives, antipyrine or isoniazid residues. They were fully characterized by appropriate means ((1)H and (13)C NMR, IR, UV-Vis, fluorescence, EPR, elemental analysis) and some of their biological properties were evaluated. Hydrophobicity (R(M0), log P), total antioxidant capacity (TAC), and antimicrobial properties are also presented and discussed.
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Affiliation(s)
- C Remes
- University of Bucharest, Department of Chemistry, Biochemistry and Catalysis, 90-92 Panduri, Bucharest 050663, Romania
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Wang Y, Calas-Blanchard C, Cortina-Puig M, Baohong L, Marty JL. An Electrochemical Method for Sensitive Determination of Antioxidant Capacity. ELECTROANAL 2009. [DOI: 10.1002/elan.200804537] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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11
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Viola G, Salvador A, Cecconet L, Basso G, Vedaldi D, Dall’Acqua F, Aloisi GG, Amelia M, Barbafina A, Latterini L, Elisei F. Photophysical Properties and Photobiological Behavior of Amodiaquine, Primaquine and Chloroquine. Photochem Photobiol 2007; 83:1415-27. [DOI: 10.1111/j.1751-1097.2007.00181.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Aloisi GG, Barbafina A, Canton M, Dall'Acqua F, Elisei F, Facciolo L, Latterini L, Viola G. Photophysical and photobiological behaviour of antimalarial drugs in aqueous solutions. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2004.tb00392.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
We report a detailed photoluminescence study of cysteinyldopa-melanin (CDM), the synthetic analogue of pheomelanin. Emission spectra are shown to be a far more sensitive probe of CDM's spectroscopic behavior than are absorption spectra. Although CDM and dopa-melanin (DM, the synthetic analogue of eumelanin) have very similar absorption spectra, we find that they have very different excitation and emission characteristics; CDM has two distinct photoluminescence peaks that do not shift with excitation wavelength. Additionally, our data suggest that the radiative quantum yield of CDM is excitation energy dependent, an unusual property among biomolecules that is indicative of a chemically disordered system. Finally, we find that the radiative quantum yield for CDM is approximately 0.2%, twice that of DM, although still extremely low. This means that 99.8% of the energy absorbed by CDM is dissipated via nonradiative pathways, consistent with its role as a pigmentary photoprotectant.
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Affiliation(s)
- Jennifer Riesz
- Soft Condensed Matter Physics Group and Centre for Biophotonics and Laser Science, School of Physical Sciences, University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia.
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El-Gogary S, Grabner G. Ultraviolet photoionization of the photosensitizers khellin and visnagin in aqueous solution and in micelles: one-photon ionization is a minor process. Photochem Photobiol Sci 2006; 5:311-6. [PMID: 16520866 DOI: 10.1039/b515615g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One-photon ionization, leading to formation of hydrated electrons and radical cations, has been proposed as a possible mechanism of action of some sensitizers in photobiology. In this contribution, we have investigated this proposal for the compounds khellin and visnagin, used in photomedical applications. Nanosecond transient absorption spectroscopy covering a wide range of laser pulse energies was employed to measure the formation of radical cations and hydrated electrons in aqueous solution and in cationic (CTAB) as well as anionic (SDS) micellar solutions. A model allowing for simultaneous one- and two-photon processes and fully accounting for the nonlinearity of the pulse energy dependence was used to simulate the data. The results did not support the hypothesis of a significant role of one-photon ionization, the upper limits of the quantum yields of radical cation formation being phi < 0.01 for visnagin and phi < 0.004 for khellin.
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Affiliation(s)
- Sameh El-Gogary
- Department of Chemistry, Faculty of Science, Mansoura University, New Damietta, Egypt
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Bashkatova NV, Korotkova EI, Karbainov YA, Yagovkin AY, Bakibaev AA. Electrochemical, quantum-chemical and antioxidant properties of antipyrine and its derivatives. J Pharm Biomed Anal 2005; 37:1143-7. [PMID: 15862698 DOI: 10.1016/j.jpba.2004.11.046] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2004] [Revised: 11/18/2004] [Accepted: 11/19/2004] [Indexed: 11/29/2022]
Abstract
Electrochemical, quantum-chemical and antioxidant properties of antipyrine and its derivatives have been investigated in this work. New quantum-chemical parameter such as difference of formation heats of a molecule and its cation radical (delta deltaH(cat)) has been used in order to describe properties of the investigated substances. Electrochemical properties (oxidation, reduction potentials) have been investigated. Correlation between the calculated delta deltaH(cat) and the experimentally obtained oxidation potentials for antipyrine and its derivatives has been found.
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Campanella L, Bonanni A, Bellantoni D, Favero G, Tomassetti M. Comparison of fluorimetric, voltammetric and biosensor methods for the determination of total antioxidant capacity of drug products containing acetylsalicylic acid. J Pharm Biomed Anal 2004; 36:91-9. [PMID: 15351052 DOI: 10.1016/j.jpba.2004.06.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2004] [Accepted: 06/03/2004] [Indexed: 10/26/2022]
Abstract
Antioxidant capacity of several drug specialities containing as mean component acetylsalicylic acid were experimentally evaluated using an enzymatic electrode, recently developed by the present authors, based on superoxide dismutase (SOD) enzyme. The precision of this method of analysis was found to be good (for drug samples RSD < or = 5%). The results were also compared with those ones by a traditional spectrofluorimetric method and by two other methods, respectively, based on cyclic and pulsed voltammetry, recently trialled by the present authors.
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Affiliation(s)
- L Campanella
- Department of Chemistry, University of Rome La Sapienza, Piazzale Aldo Moro, 5 00185 Rome, Italy
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Aloisi GG, Barbafina A, Canton M, Dall'Acqua F, Elisei F, Facciolo L, Latterini L, Viola G. Photophysical and Photobiological Behavior of Antimalarial Drugs in Aqueous Solutions. Photochem Photobiol 2004; 79:248-58. [PMID: 15115297 DOI: 10.1562/sa-03-29.1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This article describes the results of a combined photophysical and photobiological study aimed at understanding the phototoxicity mechanism of the antimalarial drugs quinine (Q), quinacrine (QC) and mefloquine (MQ). Photophysical experiments were carried out in aqueous solutions by stationary and time-resolved fluorimetry and by laser flash photolysis to obtain information on the various decay pathways of the excited states of the drugs and on transient species formed on irradiation. The results obtained showed that fluorescence and intersystem crossing account for all the adsorbed quanta for Q and MQ (quantum yield of about 0.1 and 0.9, respectively) and only for 24% in the case of QC, which has a negligible fluorescence quantum yield (0.001). Laser flash photolysis experiments evidenced, for QC and MQ, the occurrence of photoionization processes leading to the formation of the radical cations of the drugs. The effects of tryptophan and histidine on the excited states and transient species of the three drugs were also investigated. In parallel, the photoactivity of the antimalarial drugs was investigated under UV irradiation on various biological targets through a series of in vitro assays in the presence and in the absence of oxygen. Phototoxicity on 3T3 cultured fibroblasts and lipid photoperoxidation were observed for all the drugs. The photodamage produced by the drugs was also evaluated on proteins by measuring the photosensitized cross-linking of spectrin. The combined approaches were proven to be useful for understanding the mechanism of phototoxicity induced by the antimalarial drugs.
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Affiliation(s)
- Gian Gaetano Aloisi
- Laboratorio di Chimica Fisica, Dipartimento di Chimica, Università di Perugia, Perugia, Italy.
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Korotkova EI, Karbainov YA, Avramchik OA. Investigation of antioxidant and catalytic properties of some biologically active substances by voltammetry. Anal Bioanal Chem 2003; 375:465-8. [PMID: 12589515 DOI: 10.1007/s00216-002-1687-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2002] [Revised: 10/30/2002] [Accepted: 11/03/2002] [Indexed: 11/26/2022]
Abstract
Antioxidants play a major role in protecting biological systems against many incurable diseases. The biological activity of 12 plant aqueous-alcohol extracts, some standard antioxidants (vitamin C, glucose, resorcinol, and catechol), Na(2)SO(3), humic acids, phthalocyanines, and chlorophyll have been investigated in this work together with evaluation of their influence on the kinetics of the oxygen electroreduction. Finally the use of these substances for prophylactic purposes has been recommended.
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