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Caracterización de la naturaleza fitoquímica y actividad alelopática de extractos naturales del roble andino colombiano Quercus humboldtii como potencial bioherbicida
dc.rights.license | Reconocimiento 4.0 Internacional |
dc.contributor.advisor | Lobo Echeverri, Tatiana |
dc.contributor.author | Ortiz López, Juan José |
dc.date.accessioned | 2024-01-31T15:04:48Z |
dc.date.available | 2024-01-31T15:04:48Z |
dc.date.issued | 2023 |
dc.identifier.uri | https://repositorio.unal.edu.co/handle/unal/85554 |
dc.description | Ilustraciones |
dc.description.abstract | En las últimas décadas el ser humano ha visto la necesidad de mantener un sistema productivo agropecuario en constante crecimiento debido a una población que ya supera los 8000 millones de habitantes. Para este fin, desde la década de los setenta se han utilizado agroquímicos de síntesis, fundamentales para la fertilización de suelos y control de especies no deseadas en monocultivos. Sin embargo, se ha reportado una relación entre la utilización de dichos agentes químicos sintéticos y daños al medio ambiente junto a incidencias en enfermedades del ser humano. Este fenómeno sumado al hecho de que los agroquímicos de síntesis son derivados del petróleo y que para el año 2050 la humanidad espera desvincularse de su uso, plantea una necesidad de buscar alternativas innovadoras y de bajo impacto medio ambiental que permitan mantener un sistema agropecuario productivo y en crecimiento. Para ello, el aprovechamiento de especies con potenciales alelopáticos puede ser una alternativa viable tanto económica como biológicamente para los países megadiversos ya que pueden darles un valor agregado a sus especies reduciendo el impacto ambiental que generan los productos agroquímicos sintéticos. Con lo anteriormente dicho, el presente estudio evaluó el potencial fitotóxico de extractos etanólicos de las especies más abundantes colectadas en 11 parcelas de estudio establecidas en remanentes de bosques andinos en Antioquia, mediante pruebas de fitotoxicidad sobre semillas de lechuga (Lactuca sativa). De este estudio se seleccionaron los extractos provenientes del roble andino colombiano Quercus humboldtii (Fagaceae) debido a su potencial promisorio afectando la germinación de semillas de lechuga (>80%) y la elongación de la radícula a una concentración de 500 mg*L-1. Adicionalmente, al tener muestras de roble colectadas en dos sitios de colección a diferentes altitudes (Belmira y Anorí), se compararon ambos extractos en bioensayos adicionales y por medio de cromatografía liquida (HPLC), para determinar la posible incidencia de los factores ambientales en la actividad y composición del extracto de roble. Aunque no se encontraron diferencias significativas en los bioensayos ni cambios sustanciales en el perfil cromatográfico de los extractos de roble con diferente origen, se seleccionó el extracto proveniente de la muestra colectada en el páramo de Belmira para proseguir el trabajo de laboratorio, por su tendencia a presentar mayores índices de fitotoxicidad y por su disponibilidad. De esta forma se determinó la concentración media inhibitoria (IC50) para dicho extracto etanólico en el ensayo de inhibición de germinación de semillas de lechuga, el cual fue de 198 mg*L-1 mostrando potencial fitotóxico, afectando tanto la inhibición de la germinación como la elongación de radícula. En el fraccionamiento biodirigido inicialmente se obtuvieron 4 fracciones nombradas F1, F2, F3 y F4. Adicionalmente por precipitación se obtuvo un sólido blanco provenientes de la fracción F2 que se denominó, F2-P. Luego de la evaluación de la bioactividad de todas las fracciones, F2 y F3 presentaron el mejor resultado en las pruebas de inhibición de la germinación, pero no se mezclaron pues se observó que ambas fracciones presentaban perfiles químicos diferentes al compararlas por cromatografía de capa fina. La fracción F2 fue finalmente seleccionada para su caracterización por presentar mejor potencial inhibidor de la germinación a diferentes concentraciones y mayor afectación en la elongación de la radícula e hipocótilo de semillas de lechuga. Al fraccionar F2 se obtuvieron 23 fracciones finales, de los cuales las fracciones F2-P, F2-2, F2-3, F2-8, F2-9 y F2-10 fueron analizadas por cromatografía de gases acoplado a espectrometría de masas (GC-MS), detectándose mayoritariamente ácidos grasos, esteroides y triterpenos. Asimismo, se purificaron los compuestos mayoritarios provenientes de fracciones derivadas de F2 (F2-1, F2-4 y F2-6) y por medio de experimentos de resonancia magnética estructural (RMN) se elucidaron las estructuras del alcano Dodecano (C1) y del triterpeno Friedelina (C2) y el esteroide β-Sitosterol (C3). Se sugiere que la presencia de este triterpeno junto con otros y núcleos esteroidales, ácidos grasos e hidrocarburos detectados por GC-MS, tendrían incidencia en el potencial alelopático que presenta el roble andino colombiano sobre la inhibición de la germinación y la inhibición en la elongación de la radícula e hipocótilo de las semillas de lechuga. Estos resultados abren la posibilidad de plantear la estandarización de muestras derivadas del roble andino como potencial producto natural bioherbicida. (texto tomado de la fuente) |
dc.description.abstract | In the last decades, human beings have seen the need to maintain a constant growing agricultural production system due to a population that already exceeds 8 billion inhabitants. To achieve this, since the 1970s, synthetic agrochemicals have been used, essentially for soil fertilization and in weed control. However, a link between the use of these synthetic chemical agents and damage to the environment together with incidences of human diseases, has been reported. This phenomenon, added to the fact that synthetic agrochemicals are derived from petroleum, and that by the year 2050 humanity expects to detach from their use, raises the need to seek innovative alternatives with low environmental impact that allow maintaining a productive and sustainable agricultural system. Thus, in megadiverse regions, the use of botanical species with allelopathic potential can be a viable alternative, both economically and biologically, since it adds value to the selected species and reduces the environmental impact generated by synthetic agrochemicals. With the previously mentioned, the present study evaluated the phytotoxic potential of ethanol-soluble extracts of the most abundant species collected in 11 study plots set in remnants of Andean forests in Antioquia, through phytotoxicity tests on lettuce seeds (Lactuca sativa). Extracts from the Colombian Andean oak, Quercus humboldtii were selected for further work due to the promising inhibitory activity of lettuce seed germination XII Caracterización de la naturaleza fitoquímica y actividad alelopática de extractos naturales del roble andino colombiano Quercus humboldtii como potencial bioherbicida (>80%), and radicle and hypocotyl elongation at a concentration of 500 mg*L-1 . In addition, having oak samples collected in two sites with differences in altitude (Belmira and Anori), comparisons were carried out by additional bioassays and by liquid chromatography (HPLC), to determine the possible incidence of environmental factors in the bioactivity and chemical composition. Even though neither significant differences were found in the bioactivity, nor major changes were evidenced in their chromatographic profile, the extract derived from the sample collected in the Belmira paramo was selected for further work, since it presented a slightly tendency to have better phytotoxicity index and was more available. In this way, the half maximum inhibitory concentration (IC50) was determined at 198 mg*L-1 evidencing a phytotoxic potential, affecting the seed germination and radicle elongation. In the bioassay-guided fractionation, 4 initial fractions were obtained, namely F1, F2, F3 and F4. Additionally, 1 white solid was precipitated from fraction F2, labelled as F2-P. After biological evaluation of all fractions, F2 and F3 evidenced the best results in the inhibition of seed germination. These two fractions were not pooled together since its chromatographic profile, followed by TLC (thin layer chromatography), was different. Finally, fraction F2 was selected for chemical characterization due to its better inhibitory potential inhibiting seed germination at different concentrations and a greater affectation in the radicle and hypocotyl elongation of the lettuce seedlings. After fractionating F2, 23 pooled fractions were obtained, from which F2-P, F2-2, F2-3, F2-8, F2-9 and F2-10 were analysed by gas chromatography coupled to mass spectrometry (GC-MS), detecting mainly fatty acids, steroids and triterpenes. Likewise, purification of major compounds was achieved from fractions derived from F2 (F2-1, F2-4 y F2-6), which were elucidated by nuclear magnetic resonance (NMR) experiments as an alcane Dodecane (C1), the triterpene Friedeline (C2) and the steroid β-Sitosterol (C3). The presence of this triterpene, along with others, and steroidal compounds, fatty acids and hidrocarbons detected through GC-MS, could support the allelopathic potential of the Colombian Andean oak in the inhibition of germination and radicle and hypocotyl elongation. These results open the possibility to formulate the standardization of samples derived from the Andean oak as a potential bioherbicidal product. |
dc.format.extent | 106 páginas |
dc.format.mimetype | application/pdf |
dc.language.iso | spa |
dc.publisher | Universidad Nacional de Colombia |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ |
dc.subject.ddc | 570 - Biología::572 - Bioquímica |
dc.title | Caracterización de la naturaleza fitoquímica y actividad alelopática de extractos naturales del roble andino colombiano Quercus humboldtii como potencial bioherbicida |
dc.type | Trabajo de grado - Maestría |
dc.type.driver | info:eu-repo/semantics/masterThesis |
dc.type.version | info:eu-repo/semantics/acceptedVersion |
dc.publisher.program | Medellín - Ciencias - Maestría en Ciencias - Química |
dc.contributor.researchgroup | Química de Los Productos Naturales y Los Alimentos |
dc.description.degreelevel | Maestría |
dc.description.degreename | Magíster en Ciencias - Química |
dc.description.researcharea | Química de los productos naturales |
dc.identifier.instname | Universidad Nacional de Colombia |
dc.identifier.reponame | Repositorio Institucional Universidad Nacional de Colombia |
dc.identifier.repourl | https://repositorio.unal.edu.co/ |
dc.publisher.faculty | Facultad de Ciencias |
dc.publisher.place | Medellín, Colombia |
dc.publisher.branch | Universidad Nacional de Colombia - Sede Medellín |
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dc.rights.accessrights | info:eu-repo/semantics/openAccess |
dc.subject.agrovoc | Roble andino colombiano Quercus humboldtii (Fagaceae) |
dc.subject.lemb | Extractos vegetales |
dc.subject.proposal | Alelopatía |
dc.subject.proposal | Bioherbicida |
dc.subject.proposal | Quercus humboldtii |
dc.subject.proposal | Friedelina |
dc.subject.proposal | Triterpenos |
dc.subject.proposal | Allelopathy |
dc.subject.proposal | Bioherbicide |
dc.subject.proposal | Quercus humboldtii |
dc.subject.proposal | Friedelin |
dc.subject.proposal | Ttriterpenes |
dc.title.translated | Characterization of the phytochemical nature and allelopathic activity of natural extracts of the Colombian Andean oak Quercus humboldtii as a potential bioherbicide |
dc.type.coar | http://purl.org/coar/resource_type/c_bdcc |
dc.type.coarversion | http://purl.org/coar/version/c_ab4af688f83e57aa |
dc.type.content | Text |
dc.type.redcol | http://purl.org/redcol/resource_type/TM |
oaire.accessrights | http://purl.org/coar/access_right/c_abf2 |
dcterms.audience.professionaldevelopment | Público general |
dc.description.curriculararea | Área Curricular en Ciencias Naturales |
dc.contributor.orcid | Ortiz López, Juan José [0000-0001-6316-633X] |
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