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Research ArticleOpen Access

DNA Oxidative-Damage Protection By 2,4-DiTertbutylphenol and 2,6-Di-Secbutylphenol: A Computational Study of their Hydroxyl Radical Scavenger Properties

Volume 8 - Issue 1

Daniel Alpízar Pedraza1, Daniel Ferrer Viñals2, Edelsys Codorniú Hernández3 and Angel Sánchez Lamar1*

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    • 1Genetic Toxicology, Department of Vegetal Biology, Havana University, Cuba
    • 2Department of Chemistry, University of Alberta, Edmonton, Canada
    • 3Department of Chemistry, University of Calgary, Canada

    *Corresponding author: Angel Sánchez Lamar, Head of Genetic Toxicology Laboratory, Department of Vegetal Biology, Faculty of Biology, Havana University, Cuba

Received: July 13, 2018;   Published: August 17, 2018

DOI: 10.26717/BJSTR.2018.08.001601

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Among Phyllanthus orbicularis K phytocompounds, 2,4-di-terbutilfenol o el 2,6-di-secbutilfenol are proposed as potent mutagenicity inhibitors produced by hydrogen peroxide, in S. tiphimurium. This DNA protected capacity, against oxidative damage can be explained, theoretically, by several ways. To date, has not been reported neither molecular mechanics as support to the antimutagenic activity of this compounds. In the present work in silico modelation was performed in order to propose a chemistry explanation of the scavenging mechanism versus hydroxyls radicals mediated by these phenols. To carried out the model, a quantum mechanics methodology was employed with: i) DFT calculations, employing B3LYP/6-31G** functional, to the structures of the 2,4-di-terbutilfenol o el 2,6-di-secbutilfenol, and the open shell uB3LYP/6-31G** functional to all proposed radicals, ii) Semi empiric calculations to model the final products obtained in the last stage of free radical reaction. The modelled mechanism proposed a hydrogen abstraction from the hydroxyl group mediated by the radical OH· generating phenoxyl free radicals in the propagation stage. These are eliminated in the termination stage by annihilation with other radicals or self-annihilation, generating both monomeric and dimeric of quinonic and phenolic-derived compounds, as final products in the proposed mechanism.

Keywords: Phyllanthus Orbicularis; Antioxidant; Desmutagen; DFT; AM1 Semi-Empiric Model

Abbreviations: DTBP: 2,4-Di-Tert-Butylphenol; DSBP: 2,6-Di-Sec-Butulphenol; ROS: Reactive Oxygen Species; RSE: Radical Stability Energy; BDE: Bonding Energy Dissociations; EF: Eigenvector Following; SOMO: Single Ocupied Molecular Orbital; HOMO: High Occupied Molecular Orbital

Abstract | Introduction | Materials and Methods | Results | Discussion | Acknowledgment | References |