Estudio teórico de la reparación de radicales libres de Triptófano y Tirosina mediada por derivados de 2-piridona
dc.contributor.advisor | Muñoz Rugeles, Leonardo | |
dc.contributor.advisor | Arboleda Lamus, Jorge Anderson | |
dc.contributor.author | Espinosa Rincón, Nicolás | |
dc.contributor.evaluator | Oliver Doerr, Markus Hans | |
dc.contributor.evaluator | Pérez Torres, Jhon Fredy | |
dc.date.accessioned | 2023-11-17T15:46:55Z | |
dc.date.available | 2023-11-17T15:46:55Z | |
dc.date.created | 2023-11-15 | |
dc.date.issued | 2023-11-15 | |
dc.description.abstract | La presencia de radicales Triptófano y Tirosina han demostrado tener efectos negativos en la salud humana. Existen reportes que asocian el estrés oxidativo que causan en las células a patologías y enfermedades como Alzheimer, Parkinson, cáncer, desórdenes cardiovasculares, entre otros. En este trabajo, se evaluó la capacidad antioxidante de las moléculas 3-hidroxi-2-piridona, 4-hidroxi-2-piridona, 5-hidroxi-2-piridona y 6-hidroxi-2-piridona frente a los radicales Triptófano y Tirosina por medio de la metodología QM-ORSA, utilizando el software Gaussian 16. De los análisis termodinámicos, cinéticos y de mecanismos obtenidos, se identificó que todos las fracciones desprotonadas de los antioxidantes reaccionaron con el catión radical triptófano por medio de mecanismos de transferencia electrónica (SET), siendo la 3-hidroxi-2-piridona y 5-hidroxi-2-piridona las que reaccionaron con mayor constante de velocidad (k≈10^7). Con respecto al radical tirosina, todos los antioxidantes reaccionaron a excepción de la 4-hidroxi-2-piridona. Las fracciones neutras reaccionaron a través de transferencia formal de hidrógeno en forma concertada (PCET) y sus fracciones desprotonadas por transferencia electrónica, siendo la 3-hidroxi-2-piridona y 5-hidroxi-2-piridona las que mejor capacidad antioxidante presentaron, k≈10^9 para mecanismo SET y k≈10^8 para mecanismo PCET. Del análisis de la variación de la constante de velocidad con el pH se evidenció que los mecanismos SET se favorecen a valores de pH mayores al pKa de la molécula, mientras que los mecanismos PCET a valores menores. | |
dc.description.abstractenglish | The presence of Tryptophan and Tyrosine radicals have been shown to have negative effects on human health. There are reports that associate the oxidative stress they cause in cells to pathologies and diseases such as Alzheimer's, Parkinson's, cancer, cardiovascular disorders, among others. In this work, the antioxidant capacity of 3-hydroxy-2-pyridone, 4-hydroxy-2-pyridone, 5-hydroxy-2-pyridone and 6-hydroxy-2-pyridone molecules was evaluated against Tryptophan and Tyrosine radicals by means of QM-ORSA methodology, using Gaussian 16 software. From the thermodynamic, kinetic and mechanism analyses obtained, it was identified that all the deprotonated fractions of the antioxidants reacted with the tryptophan radical cation by electron transfer mechanisms (SET), with 3-hydroxy-2-pyridone and 5-hydroxy-2-pyridone reacting with the highest rate constant (k≈10^7). With respect to the tyrosine radical, all antioxidants reacted except for 4-hydroxy-2-pyridone. The neutral fractions reacted through formal concerted hydrogen transfer (PCET) and their deprotonated fractions by electron transfer, with 3-hydroxy-2-pyridone and 5-hydroxy-2-pyridone showing the best antioxidant capacity k≈10^9 for SET mechanism and k≈10^8 for PCET mechanism. From the analysis of the variation of the rate constant with respect to pH, it was evident that SET mechanisms are favored at pH values higher than the pKa of the molecule, while PCET mechanisms are favored at lower values. | |
dc.description.degreelevel | Pregrado | |
dc.description.degreename | Químico | |
dc.format.mimetype | application/pdf | |
dc.identifier.instname | Universidad Industrial de Santander | |
dc.identifier.reponame | Universidad Industrial de Santander | |
dc.identifier.repourl | https://noesis.uis.edu.co | |
dc.identifier.uri | https://noesis.uis.edu.co/handle/20.500.14071/15465 | |
dc.language.iso | spa | |
dc.publisher | Universidad Industrial de Santander | |
dc.publisher.faculty | Facultad de Ciencias | |
dc.publisher.program | Química | |
dc.publisher.school | Escuela de Química | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.rights.accessrights | info:eu-repo/semantics/openAccess | |
dc.rights.coar | http://purl.org/coar/access_right/c_abf2 | |
dc.rights.creativecommons | Atribución-NoComercial-SinDerivadas 4.0 Internacional (CC BY-NC-ND 4.0) | |
dc.rights.license | Atribución-NoComercial-SinDerivadas 2.5 Colombia (CC BY-NC-ND 2.5 CO) | |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.subject | Antioxidantes | |
dc.subject | 2-Piridonas | |
dc.subject | Mecanismos FHT | |
dc.subject | Radical Triptófano | |
dc.subject | Radical Tirosina | |
dc.subject | Metodología QM-ORSA | |
dc.subject.keyword | Antioxidants | |
dc.subject.keyword | 2-Pyridones | |
dc.subject.keyword | FHT Mechanisms | |
dc.subject.keyword | Tryptophan Radical | |
dc.subject.keyword | Tyrosine Radical | |
dc.subject.keyword | QM-ORSA protocol | |
dc.title | Estudio teórico de la reparación de radicales libres de Triptófano y Tirosina mediada por derivados de 2-piridona | |
dc.title.english | Theoretical study of free radical repair of Tryptophan and Tyrosine mediated by 2-pyridone derivatives | |
dc.type.coar | http://purl.org/coar/resource_type/c_7a1f | |
dc.type.hasversion | http://purl.org/coar/version/c_b1a7d7d4d402bcce | |
dc.type.local | Tesis/Trabajo de grado - Monografía - Pregrado |
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