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Djitieu Deutchoua AD, Ngueumaleu Y, Liendji RW, Poungoue Hanga SS, Nguelo BB, Dedzo GK, Ngameni E. Unusual reactivity of 2,2-diphenyl-1-picrylhydrazyl (DPPH) with Fe 3+ controlled by competing reactions. RSC Adv 2024; 14:1354-1359. [PMID: 38174244 PMCID: PMC10763610 DOI: 10.1039/d3ra07106e] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 12/14/2023] [Indexed: 01/05/2024] Open
Abstract
2,2-Diphenyl-1-picrylhydrazyl (DPPH) is a stable organic free radical widely used in various fields as a model free radical. There is scarce information about the stability of this compound in the chemical environments in which it is used. Side reactions between DPPH and other species can alter the precision of experiments that use DPPH, such as the evaluation of antioxidant properties amongst others. Following recent investigations highlighting reactions between DPPH and metal cations or Lewis acids, a quantitative reaction between DPPH and Fe3+ in acetonitrile was studied in the present work. UV-Vis spectroscopy and electrochemistry were used to monitor the reaction. The results obtained indicate a fast and multistep reaction between Fe3+ and DPPH that can be simplified as a simple redox reaction with the formation of Fe2+ and DPPH+. The reaction mechanism proposed follows complex steps involving two competing phenomena: a disproportionation which accelerates the reaction and an oxidation process that slows it down through DPPH regeneration.
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Affiliation(s)
- Arlette Danelle Djitieu Deutchoua
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I B. P. 812 Yaoundé Cameroon
- Department of Processing and Quality Control of Aquatic Products, Institute of Fisheries and Aquatic Sciences at Yabassi, University of Douala B. P. 7236 Douala Cameroon
| | - Yannick Ngueumaleu
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I B. P. 812 Yaoundé Cameroon
| | - Rossel Wendji Liendji
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I B. P. 812 Yaoundé Cameroon
| | | | - Bruno Boniface Nguelo
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I B. P. 812 Yaoundé Cameroon
| | - Gustave Kenne Dedzo
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I B. P. 812 Yaoundé Cameroon
| | - Emmanuel Ngameni
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I B. P. 812 Yaoundé Cameroon
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Ngueumaleu Y, Deutchoua ADD, Hanga SSP, Liendji RW, Dedzo GK, Ngameni E. Probing the reactivity of 2,2-diphenyl-1-picrylhydrazyl (DPPH) with metal cations and acids in acetonitrile by electrochemistry and UV-Vis spectroscopy. Phys Chem Chem Phys 2023; 25:5282-5290. [PMID: 36723192 DOI: 10.1039/d2cp05296b] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
2,2-Diphenyl-1-picrylhydrazyl (DPPH) is certainly one of the most widely used free radicals in several applications, because of its high stability. Unfortunately, there are few works dealing with its stability in the presence of many chemical species that coexist during chemical processes. In this work, the stability of DPPH was investigated by electrochemistry and UV-Vis spectroscopy in the presence of some metal cations (Cu2+ and Zn2+) and acids (HClO4 and HNO3) in acetonitrile. In the presence of Cu2+, DPPH was oxidized to DPPH+ with the formation of an equivalent amount of Cu+. With Zn2+, DPPH undergoes a slow disproportionation with the formation of Zn(DPPH)+ and DPPH+, certainly favored by the acidity of the metal cation. This hypothesis was subsequently confirmed by studying the stability of DPPH in the presence of HClO4. This acid of appreciable strength in acetonitrile (pKa = 1.83) causes a fast disproportionation of DPPH with the formation of DPPH-H and DPPH+. This mechanism was confirmed both by UV-Vis spectroscopy and by electrochemistry, with a stoichiometry corresponding to 2 equivalents of DPPH for about 1 equivalent of HClO4. In the presence of nitric acid, which is about 107 weaker than HClO4 in acetonitrile, the disproportionation was much slower. These preliminary results are proof that many chemical species are likely to react with DPPH and indirectly induce sources of bias during its application, especially when evaluating antioxidant properties.
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Affiliation(s)
- Yannick Ngueumaleu
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I, B. P. 812 Yaoundé, Cameroon.
| | - Arlette Danelle Djitieu Deutchoua
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I, B. P. 812 Yaoundé, Cameroon. .,Department of Transformation and Quality Control of Fisheries Products, Institute of Fisheries and Aquatic Sciences at Yabassi, University of Douala, B. P. 7236 Douala, Cameroon
| | | | - Rossel Wendji Liendji
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I, B. P. 812 Yaoundé, Cameroon.
| | - Gustave Kenne Dedzo
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I, B. P. 812 Yaoundé, Cameroon.
| | - Emmanuel Ngameni
- Laboratory of Analytical Chemistry, Faculty of Sciences, University of Yaoundé I, B. P. 812 Yaoundé, Cameroon.
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Matsumoto KI, Ueno M, Shoji Y, Nakanishi I. Heavy-ion beam-induced reactive oxygen species and redox reactions. Free Radic Res 2021; 55:450-460. [PMID: 33729087 DOI: 10.1080/10715762.2021.1899171] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Quantification and local density estimation of radiation-induced reactive oxygen species (ROS) were described focusing on our recent and related studies. Charged particle radiation, i.e. heavy-ion beams, are currently utilized for medical treatment. Differences in ROS generation properties between photon and charged particle radiation may lead to differences in the quality of radiation. Radiation-induced generation of ROS in water was quantified using several different approaches to electron paramagnetic resonance (EPR) techniques. Two different densities of localized hydroxyl radical (•OH) generation, i.e. milli-molar and molar levels, were described. Yields of sparse •OH decreased with increasing linear energy transfer (LET), the yield total •OH was not affected by LET. In the high-density, molar level, •OH environment, •OH can react and directly make hydrogen peroxide (H2O2), and then possible to form a high-density H2O2 cluster. The amount of total oxidation reactions caused by oxidative ROS, such as •OH and hydroperoxyl radial (HO2•), was decreased with increasing LET. Possibilities of the sequential reactions were discussed based on the initial localized density at the generated site. Water-induced ROS have been well investigated. However, little is known about radiation-induced free radical generation in lipidic conditions. Radio-chemistry to understand the sequential radio-biological effects is still under development.
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Affiliation(s)
- Ken-Ichiro Matsumoto
- Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Megumi Ueno
- Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Yoshimi Shoji
- Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Ikuo Nakanishi
- Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
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Effect of Heavy Ion 12C 6+ Radiation on Lipid Constitution in the Rat Brain. Molecules 2020; 25:molecules25163762. [PMID: 32824857 PMCID: PMC7465761 DOI: 10.3390/molecules25163762] [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: 06/22/2020] [Revised: 07/30/2020] [Accepted: 07/31/2020] [Indexed: 11/20/2022] Open
Abstract
Heavy ions refer to charged particles with a mass greater than four (i.e., alpha particles). The heavy ion irradiation used in radiotherapy or that astronauts suffer in space flight missions induces toxicity in normal tissue and leads to short-term and long-term damage in both the structure and function of the brain. However, the underlying molecular alterations caused by heavy ion radiation have yet to be completely elucidated. Herein, untargeted and targeted lipidomic profiling of the whole brain tissue and blood plasma 7 days after the administration of the 15 Gy (260 MeV, low linear energy (LET) = 13.9 KeV/μm) plateau irradiation of disposable 12C6+ heavy ions on the whole heads of rats was explored to study the lipid damage induced by heavy ion radiation in the rat brain using ultra performance liquid chromatography-mass spectrometry (UPLC–MS) technology. Combined with multivariate variables and univariate data analysis methods, our results indicated that an orthogonal partial least squares discriminant analysis (OPLS–DA) could clearly distinguish lipid metabolites between the irradiated and control groups. Through the combination of variable weight value (VIP), variation multiple (FC), and differential (p) analyses, the significant differential lipids diacylglycerols (DAGs) were screened out. Further quantitative targeted lipidomic analyses of these DAGs in the rat brain tissue and plasma supported the notion that DAG 47:1 could be used as a potential biomarker to study brain injury induced by heavy ion irradiation.
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Deutchoua ADD, Siegnin R, Kouteu GK, Dedzo GK, Ngameni E. Electrochemistry of 2,2‐Diphenyl‐1‐picrylhydrazyl (DPPH) in Acetonitrile in Presence of Ascorbic Acid ‐ Application for Antioxidant Properties Evaluation. ChemistrySelect 2019. [DOI: 10.1002/slct.201904082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Arlette Danelle Djitieu Deutchoua
- Department of Transformation and Quality Control of Fisheries ProductsInstitute of Fisheries and Aquatic Sciences at YabassiUniversity of Douala, B. P. 7236 Douala Cameroon
- Department of Inorganic ChemistryUniversity of Yaoundé I B. P. 812 Yaoundé Cameroon
| | - Raïssa Siegnin
- Department of Inorganic ChemistryUniversity of Yaoundé I B. P. 812 Yaoundé Cameroon
| | | | - Gustave Kenne Dedzo
- Department of Inorganic ChemistryUniversity of Yaoundé I B. P. 812 Yaoundé Cameroon
| | - Emmanuel Ngameni
- Department of Inorganic ChemistryUniversity of Yaoundé I B. P. 812 Yaoundé Cameroon
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Sekine-Suzuki E, Nakanishi I, Imai K, Ueno M, Shimokawa T, Matsumoto KI, Fukuhara K. Efficient protective activity of a planar catechin analogue against radiation-induced apoptosis in rat thymocytes. RSC Adv 2018; 8:10158-10162. [PMID: 35540490 PMCID: PMC9078822 DOI: 10.1039/c7ra13111a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 03/02/2018] [Indexed: 02/01/2023] Open
Abstract
About two thirds of biological damage due to low linear energy transfer (LET) radiation, such as X-rays and the plateau region of heavy-ion beams, is known to be caused by the hydroxyl radical (˙OH), the most powerful reactive oxygen species (ROS), generated via ionisation and excitation of water molecules. Thus, compounds having an efficient scavenging activity against ROS are expected to exhibit a radioprotective activity. A planar catechin analogue, where an isopropyl fragment was introduced into the catechol ring of (+)-catechin, showed an efficient protective effect against X-ray induced apoptosis in rat thymocytes compared to (+)-catechin. The planar catechin scavenged 2,2-diphenyl-1-picrylhydrazyl radicals (DPPH˙) solubilised in water by β-cyclodextrin about 10-fold faster than (+)-catechin in phosphate buffer (0.1 M, pH 7.4) at 298 K. Furthermore, the experimental log P value of the planar catechin (1.22) is reported to be significantly larger than that of (+)-catechin (0.44). The higher radical-scavenging activity and lipophilicity of the planar catechin than those of (+)-catechin may contribute in part to the higher protective activity against X-ray-induced apoptosis in rat thymocytes. A planar catechin analogue showed a significant higher protective activity against X-ray induced apoptosis in rat thymocytes than (+)-catechin.![]()
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Affiliation(s)
- Emiko Sekine-Suzuki
- Quantitative RedOx Sensing Team (QRST)
- Department of Basic Medical Sciences for Radiation Damages
- National Institute of Radiological Sciences (NIRS)
- National Institutes for Quantum and Radiological Science and Technology (QST)
- Japan
| | - Ikuo Nakanishi
- Quantitative RedOx Sensing Team (QRST)
- Department of Basic Medical Sciences for Radiation Damages
- National Institute of Radiological Sciences (NIRS)
- National Institutes for Quantum and Radiological Science and Technology (QST)
- Japan
| | - Kohei Imai
- Quantitative RedOx Sensing Team (QRST)
- Department of Basic Medical Sciences for Radiation Damages
- National Institute of Radiological Sciences (NIRS)
- National Institutes for Quantum and Radiological Science and Technology (QST)
- Japan
| | - Megumi Ueno
- Quantitative RedOx Sensing Team (QRST)
- Department of Basic Medical Sciences for Radiation Damages
- National Institute of Radiological Sciences (NIRS)
- National Institutes for Quantum and Radiological Science and Technology (QST)
- Japan
| | - Takashi Shimokawa
- Quantitative RedOx Sensing Team (QRST)
- Department of Basic Medical Sciences for Radiation Damages
- National Institute of Radiological Sciences (NIRS)
- National Institutes for Quantum and Radiological Science and Technology (QST)
- Japan
| | - Ken-ichiro Matsumoto
- Quantitative RedOx Sensing Team (QRST)
- Department of Basic Medical Sciences for Radiation Damages
- National Institute of Radiological Sciences (NIRS)
- National Institutes for Quantum and Radiological Science and Technology (QST)
- Japan
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