Adsorción de nucleobases del ADN por fullerenos de nitruro de boro: Efecto de los enlaces homonucleares

dc.contributor.advisorChigo Anota, Ernesto
dc.contributor.advisorBernal, Andrés
dc.coverage.spatialColombia
dc.creatorGarcía Laiton, Gabriel Eduardo
dc.creator.degreeMagíster en Modelado y Simulación
dc.date.accessioned2023-04-12T15:01:01Z
dc.date.available2023-04-12T15:01:01Z
dc.date.created2023
dc.description.abstractEn la presente investigación se abordó el estudio de estructuras fullerénicas de nitruro de boro para analizar la interacción que tienen con las nucleobases adenina (A), citosina (C), guanina (G) y timina (T), pertenecientes al ácido desoxirribonucleico (ADN), y de esta manera evaluar su viabilidad para uso como posibles transportadores de fármacos y/o biosensores. El estudio de simulación molecular se realizó con el uso de cálculos propios de la mecánica cuántica con el esquema de la Teoría de los Funcionales de la Densidad (DFT; por sus siglas en inglés) en donde se exploró la interacción de adsorbato-adsorbente entre las nucleobases y los fullerenos de nitruro de boro (BNF). Se realizó la optimización de la geometría molecular entre los fullerenos B12N12-36HT y B12N12-18HM (HT: heteronucleares, HM: homonucleares) y las nucleobases, obteniéndose la estructura de menor energía a través del método HeydScuseria-Ernzerhof (HSEh1PBE), con el uso de la función de base 6-311 g(d,p). Se desarrollaron simulaciones tanto en estado gaseoso como en fase acuosa y se evaluó la capacidad de quimisorción y de fisisorción de los fullerenos de nitruro de boro previamente nombrados. Posteriormente a la optimización molecular y obtención de las posiciones de mínima energía, se calcularon los descriptores cuánticos que representan las propiedades de los complejos fullereno-nucleobase. Los principales descriptores fueron distancia de enlace, diferencia de energía HOMO-LUMO, momento dipolar, potencial químico, función de trabajo y energía de adsorción tanto en fase gas como con el uso agua como solvente. Adicionalmente, se desarrollaron cálculos vibracionales dentro de la aproximación armónica para las estructuras identificadas con la energía más baja y confirmar si estas estructuras corresponden a verdaderos mínimos en la superficie de energía potencial. La energía de adsorción para cada uno de los complejos fue negativa, indicando procesos exotérmicos y en algunos casos se produjo quimisorción o fisisorción, dependiendo particularmente de las condiciones de reacción, y que incluyen multiplicidad, presencia de solvente y carga eléctrica. En los casos en los que se produjo fisisorción, se formaron interacciones no-covalentes entre el adsorbato y el adsorbente. Algunos sistemas con este comportamiento son aquellos en los que se formó un enlace NH-H o N-H. En los que se produjo quimisorción se evidenció la formación de enlaces covalentes entre el oxígeno de las nucleobases y un átomo de boro de los fullerenos utilizados. Para la citosina, la guanina y la adenina se identificó que el grupo funcional de mayor preferencia de adsorción es el grupo CO. La timina se adsorbió principalmente a través del grupo NH2. De acuerdo con los descriptores cuánticos, para la estructura prístina se exhibe un bajo comportamiento reactivo, con valores de función de trabajo bajos y polaridad media de las moléculas. Al incluir los enlaces homonucleares se aumentaron estas propiedades, favoreciendo mucho más la adsorción de las nucleobases del ADN, reactividad química, solubilidad y conductividad tanto en la fase gaseosa como en fase acuosa.spa
dc.description.abstractenglishIn this researching, the study of fullerene structures of boron nitride was approached to analyze their interaction with the nucleobases adenine (A), cytosine (C), guanine (G) and thymine (T), belonging to deoxyribonucleic acid (DNA) and in this way evaluate their viability for use as possible drug transporters and/or biosensors. The molecular simulation study was carried out using quantum mechanics calculations with the Density Functional Theory (DFT) scheme where the adsorbate-adsorbent interaction between nucleobases and boron nitride fullerenes (BNF) was explored. Molecular geometry optimization between B12N12-36HT and B12N12-18HM (HT: heteronuclear, HM: homonuclear) fullerenes and nucleobases was performed, obtaining the lowest energy structure through the Heyd-Scuseria-Ernzerhof (HSEh1PBE) method, with the use of the 6-311 g(d,p) basis function. Both gas and aqueous phase simulations were developed and the chemisorption and physisorption capabilities of the previously named boron nitride fullerenes were evaluated. After the molecular optimization and obtaining the minimum energy positions, the quantum descriptors representing the properties of the fullerene-nucleobase complexes were calculated. The main descriptors were bond distance, HOMO-LUMO energy difference, dipole moment, chemical potential, work function and adsorption energy both in gas phase and using water as solvent. Additionally, vibrational calculations were developed within the harmonic approximation for the structures identified with the lowest energy to confirm whether these structures correspond to true minima on the potential energy surface. The adsorption energy for each of the complexes was negative, indicating exothermic processes and in some cases chemisorption or physisorption occurred, depending particularly on the reaction conditions, including multiplicity, solvent presence, and electrical charge. In cases where physisorption occurred, non-covalent interactions were formed between the adsorbate and the adsorbent. Some systems with this behavior are those in which a NH-H or N-H bond was formed. In those in which chemisorption occurred, the formation of covalent bonds between the oxygen of the nucleobases and a boron atom of the fullerenes used was evidenced. For cytosine, guanine, and adenine it was identified that the functional group with the highest adsorption preference is the CO group. Thymine was adsorbed mainly through the NH2 group. According to the quantum descriptors, low reactive behavior is exhibited for the pristine structure, with low work function values and medium polarity of the molecules. The inclusion of homonuclear bonds increased these properties, favoring much more the adsorption of DNA nucleobases, chemical reactivity, solubility and conductivity in both gas and aqueous phases.spa
dc.description.hashtag#Nucleobasesspa
dc.description.hashtag#ADNspa
dc.description.rda1 recurso en línea (archivo de texto)
dc.format.extent37 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.urihttps://hdl.handle.net/20.500.12010/31081
dc.language.isospaspa
dc.publisherUniversidad de Bogotá Jorge Tadeo Lozanospa
dc.publisher.facultyFacultad de Ciencias Naturales e Ingeniería
dc.publisher.programMaestría en Modelado y Simulación MM&S
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.localAbierto (Texto Completo)spa
dc.sourcereponame:Expeditio Repositorio Institucional UJTL
dc.sourceinstname:Universidad de Bogotá Jorge Tadeo Lozano
dc.subjectNucleobases del ANDspa
dc.subjectEnlaces homonuclearesspa
dc.subjectNitruro de borospa
dc.subject.keywordDNAspa
dc.subject.lembADN -- Tesis y disertaciones académicasspa
dc.subject.lembIngeniería genéticaspa
dc.subject.lembModelos molecularesspa
dc.titleAdsorción de nucleobases del ADN por fullerenos de nitruro de boro: Efecto de los enlaces homonuclearesspa
dc.title.alternativeAdsorption of DNA nucleobases by boron nitride fullerenes: Effect of homonuclear bonds
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.driverinfo:eu-repo/semantics/masterThesis
dc.type.hasversioninfo:eu-repo/semantics/acceptedVersion
dc.type.localTrabajo de grado de maestría

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license.txt
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FOR-EFE-GDB-007_AUTORIZACION_DE_PUBLICACION_DE_TESIS_O_TRABAJO_DE_GRADO_ECA.pdf
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2023-formato-Gabriel-Uni-JTL.pdf
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