Revista Colombiana de Quimica最新文献_第10页

Dolabellane diterpenes from the Caribbean soft corals Eunicea laciniata and Eunicea asperula and determination of their anti HSV-1 activity 加勒比软珊瑚银针和粗银针的Dolabellane二萜及其抗HSV-1活性的测定

IF 0.8

Revista Colombiana de Quimica Pub Date : 2017-01-01 DOI: 10.15446/REV.COLOMB.QUIM.V46N1.62830

Fabián Amaya García, Maria Leonisa Sanchez Nuñez, Freddy A. Ramos, M. Puyana, I. Paixão, V. L. Teixeira, L. Castellanos

{"title":"Dolabellane diterpenes from the Caribbean soft corals Eunicea laciniata and Eunicea asperula and determination of their anti HSV-1 activity","authors":"Fabián Amaya García, Maria Leonisa Sanchez Nuñez, Freddy A. Ramos, M. Puyana, I. Paixão, V. L. Teixeira, L. Castellanos","doi":"10.15446/REV.COLOMB.QUIM.V46N1.62830","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V46N1.62830","url":null,"abstract":"Los dolabellanos son diterpenos con importante actividad antiviral, la mayor parte de los estudios se han realizado con compuestos aislados de algas pardas del genero Dictyota. Los corales blandos son tambien una importante fuente de dolabellanos, pero el potencial antiviral de estos ha sido muy poco estudiado. Como parte de nuestra busqueda de compuestos bioactivos a partir de fuentes marinas, se llevo a cabo el estudio quimico de los dolabellanos presentes en los octocorales Eunicea laciniata y Eunicea asperula, recolectados en Santa Marta, Caribe colombiano. Los dolabellanos 1 - 6 fueron aislados del octocoral E. laciniata mientras que en E. asperula se encontraron los compuestos 2 , 4 y 5 . La elucidacion estructural se llevo a cabo mediante experimentos de RMN, espectrometria de masas, rotacion optica y posterior comparacion con reportes previos en la literatura. El analisis por CG-EM evidencio que la dolabellatrienona ( 2 ) se puede transformar en los compuestos 4 y 5 como producto del almacenamiento prolongado, no obstante, tales compuestos tambien estuvieron presentes en los extractos de los organismos estudiados. El compuesto 6 inhibio la replicacion del VHS-1 (73,7% de inhibicion en celulas infectadas a una concentracion de 50 μM) sin efecto citotoxico (CC50 = 959), mostrando una citotoxicidad similar al Aciclovir®, un control positivo, por lo cual se perfila como un candidato para la realizacion de estudios adicionales sobre el potencial de los dolabellanos como agentes antivirales.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67056124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Corrosion inhibition studies of the combined admixture of 1, 3-diphenyl-2-thiourea and 4-hydroxy-3-methoxybenzaldehyde on mild steel in dilute acid media 1,3 -二苯基-2-硫脲和4-羟基-3-甲氧基苯甲醛复合外加剂在稀酸介质中对低碳钢的缓蚀研究

IF 0.8

Revista Colombiana de Quimica Pub Date : 2017-01-01 DOI: 10.15446/REV.COLOMB.QUIM.V46N1.59578

R. Loto

{"title":"Corrosion inhibition studies of the combined admixture of 1, 3-diphenyl-2-thiourea and 4-hydroxy-3-methoxybenzaldehyde on mild steel in dilute acid media","authors":"R. Loto","doi":"10.15446/REV.COLOMB.QUIM.V46N1.59578","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V46N1.59578","url":null,"abstract":"Mild steel corrosion is responsible for economic and industrial losses due to accelerated deterioration. Synthesized derivatives of thiourea and phenolic aldehydes containing heteroatoms are capable of inhibiting corrosion by adsorption onto the steel through formation of strong bonds. Thus, the electrochemical corrosion inhibition properties of the combined admixture of 1,3-diphenyl-2-thiourea and 4-hydroxy-3-methoxybenzaldehyde on mild steel in 1 M H2SO4 and HCl acid media were studied through weight loss analysis, potentiodynamic polarization method, optical microscopy and IR spectroscopy. Results showed that the organic mixture effectively inhibited the corrosion of mild steel in both solutions with an optimal inhibition efficiency of 97.4% and 97.47% in H2SO4 from weight loss and potentiodynamic polarization test, while the corresponding values in HCl were 94.71% and 89.73% respectively. Thermodynamic calculations showed that the compound chemisorbed onto the steel surface blocking the diffusion of corrosive anions. Observations from micro-analytical images confirmed the effective inhibition property of the compound and its presence on the surface topography of the steel. Infrared spectra revealed the presence of the functional groups of the organic compound responsible for corrosion inhibition. The adsorption of the compound was deduced to obey the Langmuir, Frumkin and Freundlich adsorption isotherm.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67055893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Valores de colinesterasa plasmática y eritrocitaria con ácido 6-6‘-ditiodinicotínico (DTNA) como indicador 以6-6'-二硫代肌酸（DTNA）为指标的血浆和红细胞胆碱酯酶值

IF 0.8

Revista Colombiana de Quimica Pub Date : 2017-01-01 DOI: 10.15446/REV.COLOMB.QUIM.V46N1.62849

Beatriz Restrepo Cortés, Ángela Liliana Londoño Franco, Juan Antonio Sánchez López

{"title":"Valores de colinesterasa plasmática y eritrocitaria con ácido 6-6‘-ditiodinicotínico (DTNA) como indicador","authors":"Beatriz Restrepo Cortés, Ángela Liliana Londoño Franco, Juan Antonio Sánchez López","doi":"10.15446/REV.COLOMB.QUIM.V46N1.62849","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V46N1.62849","url":null,"abstract":"Se realizo un estudio descriptivo transversal empleando acido 6-6‘-ditiodinicotinico (DTNA) como indicador para calcular los valores de la actividad de colinesterasa plasmatica (AchP) y eritrocitaria (AchE) humana y estandarizarlos para ser utilizados como indicadores de riesgo laboral por exposicion a organofosforados y carbamatos en la poblacion de la zona cafetera de Colombia. Se eligio esta tecnica pues es una alternativa precisa, sencilla y economica: con pocos interferentes permite analizar AchP y AchE, no se tiene que corregir con hemoglobina; el DTNA es estable congelado o refrigerado y permite analizar muchas muestras en poco tiempo. Se evaluaron 819 muestras de agricultores. La AchE fue significativamente mayor en las personas menores de 45 anos y en personas no fumigadoras, la AchP fue mayor en los fumigadores; esto es un indicador de que la poblacion fumigadora se encuentra expuesta a organofosforados y carbamatos de forma prolongada. Se sugiere utilizar como valores maximos de referencia de la AchE y AchP 11378 U/L y 10354 U/L, respectivamente como indicadores de intervencion ocupacional.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67056464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Magnetita (Fe3O4): Una estructura inorgánica con múltiples aplicaciones en catálisis heterogénea 磁铁矿(Fe3O4):一种在多相催化中具有多种应用的无机结构

IF 0.8

Revista Colombiana de Quimica Pub Date : 2017-01-01 DOI: 10.15446/REV.COLOMB.QUIM.V46N1.62831

José Carriazo Baños, V. Lara, Cristian Ochoa Puentes

{"title":"Magnetita (Fe3O4): Una estructura inorgánica con múltiples aplicaciones en catálisis heterogénea","authors":"José Carriazo Baños, V. Lara, Cristian Ochoa Puentes","doi":"10.15446/REV.COLOMB.QUIM.V46N1.62831","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V46N1.62831","url":null,"abstract":"Se describio la intervencion del mineral magnetita como catalizador o como soporte catalitico, un material inorganico con una estructura de espinela inversa (FeFe2O4), en el desarrollo de un numero importante de reacciones quimicas de interes cientifico, tecnologico y ambiental. Debido a la necesidad actual de generar procesos quimicos eficientes y favorables ambientalmente, la magnetita se ha convertido en un material promisorio en los contextos de la quimica verde, la quimica fina y la catalisis heterogenea. Este oxido de hierro se ha estudiado en diversas reacciones: catalizador masico, soporte catalitico de metales y de oxidos metalicos, nucleo de catalizadores tipo core-shell, o modificado mediante el anclaje de organocatalizadores y complejos metalicos. Se discute el desempeno catalitico de estos sistemas basados en magnetita, en reacciones de catalisis asimetrica, ambiental, acido-base, de oxido-reduccion, de sintesis multicomponente y de acoplamiento C-C. Particularmente, dichos catalizadores han mostrado enorme importancia en ciertas reacciones de tipo Sonogashira, Sonogashira–Hagihara, Mannich, Ullman, Knoevenagel, Suzuki-Miyaura y Fenton heterogenea, entre otras. Finalmente, se detallaron algunos usos tecnologicos de la magnetita en el contexto nacional (Colombia) y se intento localizar geograficamente los depositos importantes.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V46N1.62831","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67055747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

A DFT study on Dichloro{(E)-4-dimethylamino-N′-[(pyridin-2 yl)methylidene-κN]benzohydrazide-κO}M2+ (M=Zn, Cu, Ni and Co) complexes: Effect of the metal over association energy and complex geometry 二氯{(E)-4-二甲氨基- n′-[(吡啶-2基)甲基-κ n]苯并肼-κ o}M2+ (M=Zn, Cu, Ni和Co)配合物的DFT研究:金属对缔合能和配合物几何形状的影响

IF 0.8

Revista Colombiana de Quimica Pub Date : 2016-09-01 DOI: 10.15446/REV.COLOMB.QUIM.V45N3.57351

M. Varela, Gustavo Adolfo Gutiérrez Gómez, Manuel Noé Chaur Valencia

{"title":"A DFT study on Dichloro{(E)-4-dimethylamino-N′-[(pyridin-2 yl)methylidene-κN]benzohydrazide-κO}M2+ (M=Zn, Cu, Ni and Co) complexes: Effect of the metal over association energy and complex geometry","authors":"M. Varela, Gustavo Adolfo Gutiérrez Gómez, Manuel Noé Chaur Valencia","doi":"10.15446/REV.COLOMB.QUIM.V45N3.57351","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V45N3.57351","url":null,"abstract":"The molecular geometry of ( E )-4-dimethylamino-N′-[(pyridin-2-yl)methylidene- N]benzohydrazide (C 15 H 16 N 4 O) complexed with M 2+ (M=Zn, Cu, Ni, Fe, Mn, Ca and Co) ions were calculated, using density functional theory (B3LYP) with 6-31G(d, p) basis set. Vibrational frequencies were computed in order to verify the absence of imaginary vibrational frequencies, fact that confirms the global minimum in geometry optimization. Molecular geometry parameters (bond lengths and angles) for Cu 2+ and Zn 2+ complexes were compared with crystallographic data previously reported, showing good correlation. Binding energies for all complexes were computed at B3LYP/6-31G++(d, p) level of theory. These calculations indicate that Cu-L is the lowest favorable complex, Cu 2+ corresponds to the smallest cation on the present study. In the other hand, Ca-L, one of the less favorable complex, corresponds to the biggest cation analyzed in the present study. Molecular orbital analysis was carried out showing variations in energy differences between HOMO-LUMO values in function of the metallic ion employed.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67055621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Síntesis y caracterización estructural de hidrotalcitas de Cu-Zn-Al Cu-Zn-Al水滑石的合成与结构表征

IF 0.8

Revista Colombiana de Quimica Pub Date : 2016-09-01 DOI: 10.15446/REV.COLOMB.QUIM.V45N3.61381

Edgardo Meza Fuentes, J. R. Ruiz, Adolfo A. Pájaro Payares

{"title":"Síntesis y caracterización estructural de hidrotalcitas de Cu-Zn-Al","authors":"Edgardo Meza Fuentes, J. R. Ruiz, Adolfo A. Pájaro Payares","doi":"10.15446/REV.COLOMB.QUIM.V45N3.61381","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V45N3.61381","url":null,"abstract":"Las hidrotalcitas pueden ser usadas en areas como catalisis, medicina, quimica ambiental, entre otras. Dependiendo de los metales presentes, los solidos derivados de la calcinacion de hidrotalcitas tambien son usados debido a su caracter basico, efecto de memoria y alta area superficial especifica. En este estudio se evaluaron caracteristicas de hidrotalcitas a base de Cu-Zn-Al. Los analisis se realizaron usando AAS, DRX, FTIR, TGA y DSC. Se observo que, en los solidos con mayor cantidad de cobre, la banda del estiramiento O••H (M••OH, H••OH) se desplaza a valores mas bajos de numero de onda, debido a que la densidad electronica de los grupos OH se orienta hacia el centro metalico de cobre. En todos los solidos se observo la formacion de la fase hidrotalcita, y de la fase Cu(OH) 2 en los solidos con mayor contenido de cobre, lo que puede ser atribuido al efecto Jahn-Teller. Los resultados mostraron que los solidos con mayor contenido de cobre colapsan en temperaturas menores. En todas las muestras se observaron eventos como: descomposicion de la estructura HTLc, formacion de oxidos metalicos y descomposicion de carbonatos que quedaron ocluidos en los poros de los solidos debido al colapso de la estructura laminar.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V45N3.61381","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67055640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Anti-pepsin activity of silicon dioxide nanoparticles 二氧化硅纳米颗粒的抗胃蛋白酶活性

IF 0.8

Revista Colombiana de Quimica Pub Date : 2016-09-01 DOI: 10.15446/REV.COLOMB.QUIM.V45N3.58760

H. Al-Hakeim, K. M. Jasem, S. Moustafa

引用次数: 2

Comparación entre métodos de extracción para la obtención de volátiles a partir de pulpa de lulo (Solanum quitoense) 从lulo (Solanum quitoense)纸浆中提取挥发性物质的方法比较

IF 0.8

Revista Colombiana de Quimica Pub Date : 2016-09-01 DOI: 10.15446/REV.COLOMB.QUIM.V45N3.61359

Eduardo Javid Corpas Iguarán, Gonzalo Taborda Ocampo, Omar Alberto Tapasco Alzate, Aristófeles Ortiz

引用次数: 1

Acylhydrazone-based dynamic combinatorial libraries: study of the thermodynamic/kinetic evolution, configurational and coordination dynamics 基于酰基腙的动态组合文库:热力学/动力学演化、构型和配位动力学研究

IF 0.8

Revista Colombiana de Quimica Pub Date : 2016-09-01 DOI: 10.15446/REV.COLOMB.QUIM.V45N3.61408

M. A. Gordillo, F. Zuluaga, M. Chaur

引用次数: 3

Analytical method validation of GC-FID for the simultaneous measurement of hydrocarbons (C2-C4) in their gas mixture GC-FID同时测定其气体混合物中碳氢化合物(C2-C4)的分析方法验证

IF 0.8

Revista Colombiana de Quimica Pub Date : 2016-09-01 DOI: 10.15446/REV.COLOMB.QUIM.V45N3.58085

Oman Zuas, Muhammad Rizky Mulyana, H. Budiman

{"title":"Analytical method validation of GC-FID for the simultaneous measurement of hydrocarbons (C2-C4) in their gas mixture","authors":"Oman Zuas, Muhammad Rizky Mulyana, H. Budiman","doi":"10.15446/REV.COLOMB.QUIM.V45N3.58085","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V45N3.58085","url":null,"abstract":"An accurate gas chromatography coupled to a flame ionization detector (GC-FID) method was validated for the simultaneous analysis of light hydrocarbons (C 2 -C 4 ) in their gas mixture. The validation parameters were evaluated based on the ISO/IEC 17025 definition including method selectivity, repeatability, accuracy, linearity, limit of detection (LOD), limit of quantitation (LOQ), and ruggedness. Under the optimum analytical conditions, the analysis of gas mixture revealed that each target component was well-separated with high selectivity property. The method was also found to be precise and accurate. The method linearity was found to be high with good correlation coefficient values (R 2 ≥ 0.999) for all target components. It can be concluded that the GC-FID developed method is reliable and suitable for determination of light C 2 -C 4 hydrocarbons (including ethylene, propane, propylene, isobutane, and n-butane) in their gas mixture. The validated method has successfully been applied to the estimation of hydrocarbons light C 2 -C 4 hydrocarbons in natural gas samples, showing high performance repeatability with relative standard deviation (RSD) less than 1.0% and good selectivity with no interference from other possible components could be observed.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67055958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4