Pub Date : 2018-09-01DOI: 10.15446/REV.COLOMB.QUIM.V47N3.70402
Yetmy Rocío Peña Martínez, M. J. Martínez, Jairo Arturo Guerrero Dallos
Aunque en la actualidad existe una gran preocupación por la contaminación y los posibles efectos sobre la salud que genera el uso frecuente de herbicidas, los estudios ambientales en los países tropicales son escasos, especialmente en Colombia. Por tanto, en el presente trabajo se evaluó la adsorción-desorción de diurón y ametrina en un suelo de Colombia (SC) y de España (SE). Los ensayos de adsorción-desorción se realizaron con moléculas de los herbicidas marcados con 14C, empleando la técnica batch equilibrium. En ambos suelos y para ambos herbicidas hubo un buen ajuste a las isotermas de Freundlich con R2 mayores a 0,99. Para diurón, en SE (Kfa = 12,82 ± 1,23) hubo mayor poder de adsorción frente a SC (4,56 ± 0,26). Por el contrario, para la ametrina se encontró un valor de Kfa = 6,47 ± 0,25 en SC y de 3,05 ± 0,08 en SE, mostrando mayor interacción con SC en comparación con SE. Para diurón se observó un grado de histéresis mayor en SC y para ametrina en SE, mostrando que la interacción de los dos herbicidas con los componentes de cada suelo es diferente dependiendo de su constitución mineralógica y su valor de pH.
{"title":"Adsorción-desorción de diurón y ametrina en suelos de Colombia y España","authors":"Yetmy Rocío Peña Martínez, M. J. Martínez, Jairo Arturo Guerrero Dallos","doi":"10.15446/REV.COLOMB.QUIM.V47N3.70402","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N3.70402","url":null,"abstract":"Aunque en la actualidad existe una gran preocupación por la contaminación y los posibles efectos sobre la salud que genera el uso frecuente de herbicidas, los estudios ambientales en los países tropicales son escasos, especialmente en Colombia. Por tanto, en el presente trabajo se evaluó la adsorción-desorción de diurón y ametrina en un suelo de Colombia (SC) y de España (SE). Los ensayos de adsorción-desorción se realizaron con moléculas de los herbicidas marcados con 14C, empleando la técnica batch equilibrium. En ambos suelos y para ambos herbicidas hubo un buen ajuste a las isotermas de Freundlich con R2 mayores a 0,99. Para diurón, en SE (Kfa = 12,82 ± 1,23) hubo mayor poder de adsorción frente a SC (4,56 ± 0,26). Por el contrario, para la ametrina se encontró un valor de Kfa = 6,47 ± 0,25 en SC y de 3,05 ± 0,08 en SE, mostrando mayor interacción con SC en comparación con SE. Para diurón se observó un grado de histéresis mayor en SC y para ametrina en SE, mostrando que la interacción de los dos herbicidas con los componentes de cada suelo es diferente dependiendo de su constitución mineralógica y su valor de pH. ","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46474771","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}
Pub Date : 2018-05-01DOI: 10.15446/REV.COLOMB.QUIM.V47N2.68058
R. Loto
Corrosion inhibition of biodegradable chemical compounds (L-leucine and trypsin complex) on high carbon steel in 1 M H 2 SO 4 acid media was evaluated with potentiodynamic polarization technique, weight loss analysis, open circuit potential measurement, optical microscopy, and ATR-FTIR spectroscopy. Data obtained showed the mixture has a maximum inhibition efficiency of 82.4% and 90.08% from the electrochemical tests with mixed type inhibition properties. The addition of the mixture shifts significantly the corrosion potential of the steel to passivation values from open circuit potential measurement. Results from thermodynamic calculations indicated chemisorption adsorption mechanism according to Langmuir, Freundlich, and Frumkin isotherms coupled with correlation coefficients of 0.9994, 0.9651 and 0.8834. Statistical analysis showed exposure time to be the most significant variable responsible for corrosion inhibition. Identified functional groups of the compound from ATF-FTIR spectroscopy were adsorbed completely on the carbon steel surface from observation of the decreased peak intensity. Optical microscopy images of the inhibited and uninhibited steel surfaces contrast each other with due to the presence of macro-pits and porous oxide on the uninhibited steel.
{"title":"Electrochemical analysis of the corrosion inhibition properties of L-leucine and trypsin complex admixture on high carbon steel in 1 M H2SO4 solution","authors":"R. Loto","doi":"10.15446/REV.COLOMB.QUIM.V47N2.68058","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.68058","url":null,"abstract":"Corrosion inhibition of biodegradable chemical compounds (L-leucine and trypsin complex) on high carbon steel in 1 M H 2 SO 4 acid media was evaluated with potentiodynamic polarization technique, weight loss analysis, open circuit potential measurement, optical microscopy, and ATR-FTIR spectroscopy. Data obtained showed the mixture has a maximum inhibition efficiency of 82.4% and 90.08% from the electrochemical tests with mixed type inhibition properties. The addition of the mixture shifts significantly the corrosion potential of the steel to passivation values from open circuit potential measurement. Results from thermodynamic calculations indicated chemisorption adsorption mechanism according to Langmuir, Freundlich, and Frumkin isotherms coupled with correlation coefficients of 0.9994, 0.9651 and 0.8834. Statistical analysis showed exposure time to be the most significant variable responsible for corrosion inhibition. Identified functional groups of the compound from ATF-FTIR spectroscopy were adsorbed completely on the carbon steel surface from observation of the decreased peak intensity. Optical microscopy images of the inhibited and uninhibited steel surfaces contrast each other with due to the presence of macro-pits and porous oxide on the uninhibited steel.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"12-20"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.68058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47431916","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}
Pub Date : 2018-05-01DOI: 10.15446/REV.COLOMB.QUIM.V47N2.68213
Valentina Fernández, Juan Carlos Moreno-Piraján, L. Giraldo
The enthalpic and entropic changes resulting from the process of acetaminophen adsorption on activated carbons with modified surface chemistry were studied. A pH variation was performed to determine the changes in the thermodynamic properties when there are charges in the adsorbate and adsorbent. It was found that the maximum adsorption capacity (1.172 mmoles g -1 )corresponds to the process carried out in the activated charcoal labeled as CAR in this study at pH 7; the values of the thermodynamic functions immersion enthalpy and entropy of adsorption were -36.02 J g -1 and 0.123 J g -1 K -1 , respectively. Thus, the adsorption entropy change for the acetaminophen on the activated carbons depended on the pH. It was found that this thermodynamic function varies in the following order pH 2 > pH 11 > pH 7. This behavior is related to the number of species present in the solution capable of interact with the activated carbon surface.
研究了改性活性炭吸附对乙酰氨基酚过程中焓和熵的变化。通过改变pH值来确定吸附质和吸附剂中有电荷时热力学性质的变化。结果发现，在pH为7时，最大吸附量(1.172 mmol g -1)与本研究中标记为CAR的活性炭所进行的过程相对应;浸没焓和吸附熵的热力学函数分别为-36.02 J g -1和0.123 J g -1 K -1。因此，对乙酰氨基酚在活性炭上的吸附熵变取决于pH值。发现该热力学函数的变化顺序为:pH 2 > pH 11 > pH 7。这种行为与溶液中能够与活性炭表面相互作用的物质的数量有关。
{"title":"Adsorción de acetaminofén sobre carbones activados a diferente pH. Entalpía y entropía del proceso","authors":"Valentina Fernández, Juan Carlos Moreno-Piraján, L. Giraldo","doi":"10.15446/REV.COLOMB.QUIM.V47N2.68213","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.68213","url":null,"abstract":"The enthalpic and entropic changes resulting from the process of acetaminophen adsorption on activated carbons with modified surface chemistry were studied. A pH variation was performed to determine the changes in the thermodynamic properties when there are charges in the adsorbate and adsorbent. It was found that the maximum adsorption capacity (1.172 mmoles g -1 )corresponds to the process carried out in the activated charcoal labeled as CAR in this study at pH 7; the values of the thermodynamic functions immersion enthalpy and entropy of adsorption were -36.02 J g -1 and 0.123 J g -1 K -1 , respectively. Thus, the adsorption entropy change for the acetaminophen on the activated carbons depended on the pH. It was found that this thermodynamic function varies in the following order pH 2 > pH 11 > pH 7. This behavior is related to the number of species present in the solution capable of interact with the activated carbon surface.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"54-62"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.68213","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41929160","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}
Pub Date : 2018-05-01DOI: 10.15446/REV.COLOMB.QUIM.V47N2.67115
Manuel Noé Chaur Valencia, Elkin L. Romero, G. Gutierrez, M. S. Monsalve, Richard D´Vries, H. Zuluaga
A novel molecular system based on 2-((2-(4-chlorophenylhydrazone)methyl)quinoline ( 1 - E ) was synthesized. Interconversion of 1 -E to its configurational isomer 1- Z was achieved using UV radiation (250 W Hg lamp). Such isomerization was monitored by 1 H-NMR. The results suggest that the hydrazone derivative can act as a chemical brake in solution. This molecular system was structurally (Single Crystal X-Ray diffraction and DFT calculations) and spectroscopically (NMR, UV, and IR) characterized. Electrochemical measurements showed that configurational changes induce differential redox behavior. In this regard, the reported quinoline system exhibits different dynamic absorption and electrochemical properties that are modulated by the UV-light induced configurational change. Therefore, 1- E can be regarded as potential photo-electrochemical switch.
合成了以2-((2-(4-氯苯腙)甲基)喹啉(1 - E)为基础的新型分子体系。利用紫外线辐射(250 W Hg灯)实现了1- e与构型异构体1- Z的相互转化。用1h - nmr对异构化过程进行了监测。结果表明，腙衍生物在溶液中具有化学制动器的作用。对该分子体系进行了结构(单晶x射线衍射和DFT计算)和光谱(核磁共振、紫外和红外)表征。电化学测量表明，结构变化引起了不同的氧化还原行为。在这方面，所报道的喹啉体系表现出不同的动态吸收和电化学性质，这些性质是由紫外光诱导的结构变化所调节的。因此，1- E可以看作是潜在的光电开关。
{"title":"Structural, spectroscopic, and theoretical analysis of a molecular system based on 2-((2-(4-chlorophenylhydrazone)methyl)quinolone","authors":"Manuel Noé Chaur Valencia, Elkin L. Romero, G. Gutierrez, M. S. Monsalve, Richard D´Vries, H. Zuluaga","doi":"10.15446/REV.COLOMB.QUIM.V47N2.67115","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.67115","url":null,"abstract":"A novel molecular system based on 2-((2-(4-chlorophenylhydrazone)methyl)quinoline ( 1 - E ) was synthesized. Interconversion of 1 -E to its configurational isomer 1- Z was achieved using UV radiation (250 W Hg lamp). Such isomerization was monitored by 1 H-NMR. The results suggest that the hydrazone derivative can act as a chemical brake in solution. This molecular system was structurally (Single Crystal X-Ray diffraction and DFT calculations) and spectroscopically (NMR, UV, and IR) characterized. Electrochemical measurements showed that configurational changes induce differential redox behavior. In this regard, the reported quinoline system exhibits different dynamic absorption and electrochemical properties that are modulated by the UV-light induced configurational change. Therefore, 1- E can be regarded as potential photo-electrochemical switch.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"63-72"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.67115","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44505524","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}
Pub Date : 2018-05-01DOI: 10.15446/REV.COLOMB.QUIM.V47N2.67338
F. Marrero, José Prato, Y. L. Cruz, Adriana Sánchez
The present paper describes the influence of compost/solvent relations on pH and electric conductivity (CE) measurements, using water and CaCl 2 0.01 M as extractants, in the extract suspension as well as in centrifuged supernatant. According to the results, pH CaCl2 seems to be more independent of extractant quantity, contrarily to aqueous extract measurements, which increases with dilution, described by a quadratic model. As a consequence, measurement must be performed where the curve slope is minimum or null, and where the measurement becomes independent of extractant quantity. For aqueous extract, it happens at relations compost/extractant greater than 1:8, and for CaCl 2 extracts, greater than 1:5. pH H2O is higher than pH CaCl2 showing that CaCl 2 is a better acidity extractant. EC measurements also show polynomical behavior, therefore must be performed on relations compost/extractant greater than 1:6, where EC values are more independent of extractant quantity. EC could be performed in CaCl 2 extract, suspension or supernatant, with respective blank correction.
{"title":"Estudio metodológico sobre la medición de pH y conductividad eléctrica en muestras de compost","authors":"F. Marrero, José Prato, Y. L. Cruz, Adriana Sánchez","doi":"10.15446/REV.COLOMB.QUIM.V47N2.67338","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.67338","url":null,"abstract":"The present paper describes the influence of compost/solvent relations on pH and electric conductivity (CE) measurements, using water and CaCl 2 0.01 M as extractants, in the extract suspension as well as in centrifuged supernatant. According to the results, pH CaCl2 seems to be more independent of extractant quantity, contrarily to aqueous extract measurements, which increases with dilution, described by a quadratic model. As a consequence, measurement must be performed where the curve slope is minimum or null, and where the measurement becomes independent of extractant quantity. For aqueous extract, it happens at relations compost/extractant greater than 1:8, and for CaCl 2 extracts, greater than 1:5. pH H2O is higher than pH CaCl2 showing that CaCl 2 is a better acidity extractant. EC measurements also show polynomical behavior, therefore must be performed on relations compost/extractant greater than 1:6, where EC values are more independent of extractant quantity. EC could be performed in CaCl 2 extract, suspension or supernatant, with respective blank correction.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"21-27"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.67338","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44177805","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}
Pub Date : 2018-05-01DOI: 10.15446/REV.COLOMB.QUIM.V47N2.68225
Mario Ceroni Galloso, J. Angulo-Cornejo, Maria Nieves Lino-Pacaheco, C. Huerta, Enzo Martín Casimiro Soriano
A new silver coordination compound [Ag(sac)(pbi)] was synthesized by reaction of silver(I) saccharinate with 2-(2-pyridyl)benzimidazole (pbi) in 64% yield. The characterization was performed by elemental analysis, IR, UV-Visible, XPS, 1 H-NMR, and 13 C-NMR spectroscopy. According to the results, silver is coordinating through three nitrogen atoms: one from saccharinate and the others from 2-(2-pyridyl)benzimidazole forming with this ligand a five-membered chelate ring.
{"title":"Synthesis and characterization of mixed-ligand silver(I) saccharinate complex containing (2-(2-pyridyl)benzimidazole","authors":"Mario Ceroni Galloso, J. Angulo-Cornejo, Maria Nieves Lino-Pacaheco, C. Huerta, Enzo Martín Casimiro Soriano","doi":"10.15446/REV.COLOMB.QUIM.V47N2.68225","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.68225","url":null,"abstract":"A new silver coordination compound [Ag(sac)(pbi)] was synthesized by reaction of silver(I) saccharinate with 2-(2-pyridyl)benzimidazole (pbi) in 64% yield. The characterization was performed by elemental analysis, IR, UV-Visible, XPS, 1 H-NMR, and 13 C-NMR spectroscopy. According to the results, silver is coordinating through three nitrogen atoms: one from saccharinate and the others from 2-(2-pyridyl)benzimidazole forming with this ligand a five-membered chelate ring.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"73-78"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.68225","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45139073","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}
Pub Date : 2018-05-01DOI: 10.15446/REV.COLOMB.QUIM.V47N2.65812
Blanca L. Ortiz Quintero, Cecilia Anzola Velasco
The physiological effect of corn arepas consumption enriched with 10% ( w/w ) pectin extracted from banana passionfruit peel was evaluated on the serum levels of glucose and lipid in adult volunteers. The pectin was extracted with hydrochloric acid and precipitated with 96% ( v/v ) ethanol. Firstly, the volunteers consumed arepa without pectin for seven days; then, arepa with 10% of commercial citrus pectin for 20 days, and, finally, arepa with 10% banana passionfruit pectin for 20 days. At the same time, a sensory acceptance analysis was carried out. The results showed that, when consuming arepa with banana passionfruit pectin, serum glucose levels decreased significantly (5.88% (p = 0.023)), while the lipid profile was not affected. The arepa formulated with banana passionfruit pectin showed a higher percentage of soluble, insoluble and total of dietary fiber, as well as a lower percentage of available carbohydrates as compared to the other analyzed arepas. The sensory panel ruled low acceptance in flavor and texture for arepas with commercial citrus and banana passionfruit pectin. It was concluded that banana passionfruit pectin can be used for the formulation of arepas since it offers to consumers a beneficial food to reduce blood glucose levels.
{"title":"Estudio del efecto fisiológico del consumo de arepas enriquecidas con pectina extraída de la cáscara de curuba (Passiflora tripartita var. mollissima)","authors":"Blanca L. Ortiz Quintero, Cecilia Anzola Velasco","doi":"10.15446/REV.COLOMB.QUIM.V47N2.65812","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.65812","url":null,"abstract":"The physiological effect of corn arepas consumption enriched with 10% ( w/w ) pectin extracted from banana passionfruit peel was evaluated on the serum levels of glucose and lipid in adult volunteers. The pectin was extracted with hydrochloric acid and precipitated with 96% ( v/v ) ethanol. Firstly, the volunteers consumed arepa without pectin for seven days; then, arepa with 10% of commercial citrus pectin for 20 days, and, finally, arepa with 10% banana passionfruit pectin for 20 days. At the same time, a sensory acceptance analysis was carried out. The results showed that, when consuming arepa with banana passionfruit pectin, serum glucose levels decreased significantly (5.88% (p = 0.023)), while the lipid profile was not affected. The arepa formulated with banana passionfruit pectin showed a higher percentage of soluble, insoluble and total of dietary fiber, as well as a lower percentage of available carbohydrates as compared to the other analyzed arepas. The sensory panel ruled low acceptance in flavor and texture for arepas with commercial citrus and banana passionfruit pectin. It was concluded that banana passionfruit pectin can be used for the formulation of arepas since it offers to consumers a beneficial food to reduce blood glucose levels.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"5-11"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.65812","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45925267","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}
Pub Date : 2018-05-01DOI: 10.15446/REV.COLOMB.QUIM.V47N2.67352
N. Rangel-Vázquez, Dulce-Nallely Villanueva-García, J. Kalla
AMBER/PM3 hybrid model allowed determining the structural properties of 5FU and imiquimod individually and after the adsorption of chitosan hydrogels crosslinked with genipin, respectively. It was observed that the Gibbs free energy (ΔG) decreases with the adsorption, but indicates thermodynamic stability and spontaneity in both processes; ΔG was verified by the increase in the dipole moments. On the one hand, the partition coefficient established the hydrophilic character with respect to the water present in the hydrogel, which increases with the adsorption. The FTIR showed that there were displacements in the signals, however, the hydrogen bond bands attributed to the formation of new bonds to perform the adsorption of the drugs were observed. The adsorption was verified by the MESP and the surface analysis, where the distribution of nucleophilic and electrophilic zone was observed.
{"title":"Structural analysis of adsorption processes of 5FU and imiquimodon hydrogels using AMBER/PM3 hybrid model","authors":"N. Rangel-Vázquez, Dulce-Nallely Villanueva-García, J. Kalla","doi":"10.15446/REV.COLOMB.QUIM.V47N2.67352","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.67352","url":null,"abstract":"AMBER/PM3 hybrid model allowed determining the structural properties of 5FU and imiquimod individually and after the adsorption of chitosan hydrogels crosslinked with genipin, respectively. It was observed that the Gibbs free energy (ΔG) decreases with the adsorption, but indicates thermodynamic stability and spontaneity in both processes; ΔG was verified by the increase in the dipole moments. On the one hand, the partition coefficient established the hydrophilic character with respect to the water present in the hydrogel, which increases with the adsorption. The FTIR showed that there were displacements in the signals, however, the hydrogen bond bands attributed to the formation of new bonds to perform the adsorption of the drugs were observed. The adsorption was verified by the MESP and the surface analysis, where the distribution of nucleophilic and electrophilic zone was observed.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"28-35"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.67352","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42538132","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}
Pub Date : 2018-05-01DOI: 10.15446/REV.COLOMB.QUIM.V47N2.66081
Manuel Noé Chaur Valencia, Héctor Fabio Zuluaga Corrales, G. Martínez
The synthesis of new grid-type complexes of Co 2+ and Fe 2+ based on a highly soluble double hydrazone framework is reported. The data obtained from 1 H NMR, FT-IR, and elemental analysis indicate that the complexes adopted a grid-like structure. Electronic properties of the metallogrids were analyzed by UV-Vis spectroscopy in chloroform, methanol, and dichloromethane. Additionally, cyclic voltammetry and square wave voltammetry were carried out in N,N -dimethylformamide (DMF). These compounds exhibited two oxidation processes corresponding to the organic ligand and several reductions events, comprising the ligand and metal centers. Furthermore, the interplay between the metal nature and the ligand framework was also studied in detail. These results represent an advancement in the chemistry of metallogrids not only because of the few reports concerning to the electrochemical properties found in the literature, but also for the design of novel hydrazone ligands of high solubility and easy preparation.
{"title":"Electronic and electrochemical properties of grid-type metal ion complexes (Fe+2 and Co2+) with a pyridine-pyrimidine-pyridine based bis(hydrazone)","authors":"Manuel Noé Chaur Valencia, Héctor Fabio Zuluaga Corrales, G. Martínez","doi":"10.15446/REV.COLOMB.QUIM.V47N2.66081","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.66081","url":null,"abstract":"The synthesis of new grid-type complexes of Co 2+ and Fe 2+ based on a highly soluble double hydrazone framework is reported. The data obtained from 1 H NMR, FT-IR, and elemental analysis indicate that the complexes adopted a grid-like structure. Electronic properties of the metallogrids were analyzed by UV-Vis spectroscopy in chloroform, methanol, and dichloromethane. Additionally, cyclic voltammetry and square wave voltammetry were carried out in N,N -dimethylformamide (DMF). These compounds exhibited two oxidation processes corresponding to the organic ligand and several reductions events, comprising the ligand and metal centers. Furthermore, the interplay between the metal nature and the ligand framework was also studied in detail. These results represent an advancement in the chemistry of metallogrids not only because of the few reports concerning to the electrochemical properties found in the literature, but also for the design of novel hydrazone ligands of high solubility and easy preparation.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"45-53"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.66081","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49356305","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}
Pub Date : 2018-05-01DOI: 10.15446/REV.COLOMB.QUIM.V47N2.67922
Ledys S. Copete-Pertuz, María Susana Pérez-Grisales, Marian Castrillón-Tobón, Guillermo Antonio Correa Londoño, Geovanna Tafurt García, Amanda Lucía Mora Martínez
Reactive Black 5 (RB5) is an azo dye widely used in the textile industry because of its high chemical stability. Since it does not entirely fix on the fabrics, it pollutes water sources. In this work, the decolorization of aqueous solutions with RB5 was performed by heterogeneous photocatalysis with TiO 2 /UV. The reaction was carried out in an aluminum photoreactor equipped with five lamps. The effect of TiO 2 (0.1, 0.175, and 0.25 g L -1 ), RB5 concentration (50, 75, and 100 mg L -1 ), and pH (3, 7, and 11) was evaluated for 14 h, using a Box–Behnken experimental statistical design. Complete decolorization of RB5 was obtained at 14 h, employing 0.175 g L -1 TiO 2 , 50 mg L -1 RB5, and pH 3. A 98.44% of decolorization was achieved in 10 h (0.25 g L -1 of TiO 2 , 50 mg L -1 of RB5, and pH 7). The highest decolorization percentage of RB5 (99.51%) was obtained at 10 h of exposure to UV light, using 0.5 g L -1 of TiO 2 , 50 mg L -1 of the dye, and a pH of 3. Cytotoxicity tests on the HepG2 cell line indicated that photocatalytic degradation of RB5 did not generate cytotoxic byproducts.
活性黑5 (RB5)是一种偶氮染料，因其具有较高的化学稳定性而广泛应用于纺织工业。由于它不能完全固定在织物上，因此会污染水源。本研究采用tio2 /UV多相光催化对RB5水溶液进行脱色。该反应在装有5盏灯的铝光反应器中进行。采用Box-Behnken实验统计设计，评估tio2(0.1、0.175和0.25 g L -1)、RB5浓度(50、75和100 mg L -1)和pH(3、7和11)对14 h的影响。在0.175 g L -1 tio2, 50 mg L -1 RB5, pH为3的条件下，14 h RB5完全脱色。在0.25 g L -1 tio2, 50 mg L -1 RB5, pH为7的条件下，10 h的脱色率为98.44%。在0.5 g L -1 tio2, 50 mg L -1染料，pH为3的条件下，10 h的紫外光照射下，RB5的脱色率最高，达到99.51%。HepG2细胞株的细胞毒性试验表明，光催化降解RB5不产生细胞毒性副产物。
{"title":"Decolorization of Reactive Black 5 Dye by Heterogeneous Photocatalysis with TiO2/UV","authors":"Ledys S. Copete-Pertuz, María Susana Pérez-Grisales, Marian Castrillón-Tobón, Guillermo Antonio Correa Londoño, Geovanna Tafurt García, Amanda Lucía Mora Martínez","doi":"10.15446/REV.COLOMB.QUIM.V47N2.67922","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.67922","url":null,"abstract":"Reactive Black 5 (RB5) is an azo dye widely used in the textile industry because of its high chemical stability. Since it does not entirely fix on the fabrics, it pollutes water sources. In this work, the decolorization of aqueous solutions with RB5 was performed by heterogeneous photocatalysis with TiO 2 /UV. The reaction was carried out in an aluminum photoreactor equipped with five lamps. The effect of TiO 2 (0.1, 0.175, and 0.25 g L -1 ), RB5 concentration (50, 75, and 100 mg L -1 ), and pH (3, 7, and 11) was evaluated for 14 h, using a Box–Behnken experimental statistical design. Complete decolorization of RB5 was obtained at 14 h, employing 0.175 g L -1 TiO 2 , 50 mg L -1 RB5, and pH 3. A 98.44% of decolorization was achieved in 10 h (0.25 g L -1 of TiO 2 , 50 mg L -1 of RB5, and pH 7). The highest decolorization percentage of RB5 (99.51%) was obtained at 10 h of exposure to UV light, using 0.5 g L -1 of TiO 2 , 50 mg L -1 of the dye, and a pH of 3. Cytotoxicity tests on the HepG2 cell line indicated that photocatalytic degradation of RB5 did not generate cytotoxic byproducts.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"36-44"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.67922","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42111422","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：