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Search Results: 1 - 10 of 394766 matches for " Guillermo L.; MONTOYA R. "
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OBTENCIóN DE OLEORRESINA DE PIMENTóN (Capsicum annuum L.) EXTRACTION OF OLEORESIN FROM SWEET PEPPER (Capsicum annuum L.)
Jhon A CARDONA. R.,Guillermo L. LOPERA M.,Alejandra M. MONTOYA R.,Ana M. MONTOYA V.
Vitae , 2006,
Abstract: La oleorresina de pimentón (Capsicum annuum L.), la cual contiene fundamentalmente carotenoides, capsaicinoides y algunas vitaminas, tradicionalmente se usa en la industria alimentaria. ésta se obtiene mediante un proceso con las siguientes etapas: a) escaldado, b) troceado, c) secado, d) molienda, y e) extracción con solventes volátiles (hexano, acetona, acetato de etilo). Los pigmentos que se extraen se analizan mediante HPLC en fase reversa y se comparan con la oleorresina de paprika comercial importada por la empresa TECNAS . El rendimiento que se obtiene en el laboratorio está entre el 3 y 6%. Los resultados muestran la importancia del escaldado y del secado: el escaldado permite alcanzar una humedad del 13,56% en 320 min (sin escaldar en el mismo tiempo se llega al 21,01%) y el secado posibilita la extracción con solventes. Oleoresin from sweet pepper (Capsicum annuum L.), which contains mainly carotenoids, capsaicinoids and some vitamins, has been currently used in the food industry. and is obtained with the following procedure: a) scalding, b) chopping, c) drying, d) milling, and e) solvent extraction (hexane, acetone, ethyl acetate). Extracted pigments are analyzed using reverse phase HPLC and the results are compared with the oleoresin obtained from comercial paprika imported by TECNAS . The yield achieved in the laboratory is 3-6%. The results show that scalding and drying are important: the scalding allows to reach an humidity of 13.56% in 320 min (without scalding the humidity reached is 21.01%) and the drying allows extraction with solvents.
OBTENCIóN DE OLEORRESINA DE PIMENTóN (Capsicum annuum L.)
CARDONA. R.,Jhon A; LOPERA M.,Guillermo L.; MONTOYA R.,Alejandra M.; MONTOYA V.,Ana M.; PE?A A.,Juan D.; GIL M.,Manuela; BENAVIDES,Julie F.; R.,María; RíOS,Luis A.; RESTREPO V.,Gloria M.;
Vitae , 2006,
Abstract: oleoresin from sweet pepper (capsicum annuum l.), which contains mainly carotenoids, capsaicinoids and some vitamins, has been currently used in the food industry. and is obtained with the following procedure: a) scalding, b) chopping, c) drying, d) milling, and e) solvent extraction (hexane, acetone, ethyl acetate). extracted pigments are analyzed using reverse phase hplc and the results are compared with the oleoresin obtained from comercial paprika imported by tecnas?. the yield achieved in the laboratory is 3-6%. the results show that scalding and drying are important: the scalding allows to reach an humidity of 13.56% in 320 min (without scalding the humidity reached is 21.01%) and the drying allows extraction with solvents.
HPLC-ESI-IT-MS/MS Analysis and Biological Activity of Triterpene Glycosides from the Colombian Marine Sponge Ectyoplasia ferox
Jhonny Colorado-Ríos,Diana Mu?oz,Guillermo Montoya,Diana Márquez,Maria-Elena Márquez,Juan López,Alejandro Martínez
Marine Drugs , 2013, DOI: 10.3390/md11124815
Abstract: The marine sponge Ectyoplasia ferox produces antipredatory and allelopathic triterpenoid glycosides as part of its chemical defense repertoire against predators, competitors, and fouling organisms. These molecules are responsible for the pharmacological potential found in the glycosides present in this species. In order to observe the glycochemical diversity present in E. ferox, a liquid chromatography coupled to a tandem mass spectrometry approach to analyse a complex polar fraction of this marine sponge was performed. This gave valuable information for about twenty-five compounds three of which have been previously reported and another three which were found to be composed of known aglycones. Furthermore, a group of four urabosides, sharing two uncommon substitutions with carboxyl groups at C-4 on the terpenoid core, were identified by a characteristic fragmentation pattern. The oxidized aglycones present in this group of saponins can promote instability, making the purification process difficult. Cytotoxicity, cell cycle modulation, a cell cloning efficiency assay, as well as its hemolytic activity were evaluated. The cytotoxic activity was about IC 50 40 μg/mL on Jurkat and CHO-k 1 cell lines without exhibiting hemolysis. Discussion on this bioactivity suggests the scanning of other biological models would be worthwhile.
Critical Theory of Two-Dimensional Mott Transition: Integrability and Hilbert Space Mapping  [PDF]
Federico L. Bottesi, Guillermo R. Zemba
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.65069
Abstract: We reconsider the Mott transition in the context of a two-dimensional fermion model with density-density coupling. We exhibit a Hilbert space mapping between the original model and the Double Lattice Chern-Simons theory at the critical point by use of the representation theory of the q-oscillator and Weyl algebras. The transition is further characterized by the ground state modification. The explicit mapping provides a new tool to further probe and test the detailed physical properties of the fermionic lattice model considered here and to enhance our understanding of the Mott transition(s).
Sostenibilidad del software: más allá de Green IT
Guillermo Montoya
Revista Espa?ola de Innovación, Calidad e Ingeniería del Software , 2010,
Abstract:
IDENTIFICACIóN Y DIFERENCIACIóN DE MONOSACáRIDOS Y DISACáRIDOS DIASTEROMéRICOS NO DERIVATIZADOS POR ESI-IT-MS/MS
MONTOYA P,Guillermo L; RENDóN M,Alejandra; ARANGO A,Gabriel J;
Vitae , 2010,
Abstract: sugars are important molecules with remarkable cell signals pathway functions in higher organisms. the structural complexity of sugar represented by its isomeric, anomeric and diasteromeric configurations deserve the implementation of modern, rapid and sensitive methodologies for its identification and differentiation. mass spectrometry and its analyzer of ion trap provide new alternative techniques that encourage the control of the fragmentation energies supplied to molecules. since stereoisomer differentiation is consider outside the mass spectrometry domain, a methodology has been applied in order to differentiate β-d-galactose, β-d-glucose and the disaccharides β-d-galactopyranosyl-(1→4)-β-d-glucopyranoside (lactose), α-d-glucopyranosyl-(1→4)-β-d-glucopyranoside (maltose) y β-d-fructofuranosyl-(2?1)-α-d-glucopyranoside (sacarose) trough its ammonium and lithium adducts by infusion on esi-it-ms/ms mass spectrometer. different fragmentation energies have been used to ensure the ion marker occurrence in the analyte stereochemistry. it is evident that the collision energies control in structural analysis of molecules provides a powerful and modern analytical tool to be applied in control laboratories.
PRODUCTOS NATURALES ALCALOIDALES CON ACTIVIDAD ANTIPROTOZOARIA
OSORIO D.,Edison J.; MONTOYA P.,Guillermo L.; ARANGO A.,Gabriel J.;
Vitae , 2006,
Abstract: the morbidity and mortality associated with protozoan parasites diseases have motivated the investigation of new powerful and selective agents. the natural products as part of this investigation, play a crucial role in the development of a new generation of antiparasitic drugs. this review covers alkaloid compounds with mainly antiparasitic activity against leishmania ssp, tripanosoma cruzi and plasmodium falciparum, isolated from natural sources. the compounds are organized according to the metabolites structure and subjects such as mechanisms of action (for which there is availability of works), recent developments in the field and new experimental strategies are discussed
ACTIVIDAD ANTIPLASMODIAL DE ALCALOIDES APORFíNICOS DE Rollinia pittieri Y Pseudomalmea boyacana (ANNONACEAE)
OSORIO D,Edison J.; MONTOYA P.,Guillermo L.; MU?OZ D.,Katalina; ARANGO A.,Gabriel J.;
Vitae , 2006,
Abstract: in the course of from ethnobotanical or chemotaxonomical studies on biologically active substances with antiparasitic effects from anonaceae colombian plants, substantial antiplasmodial activity was observed from the ethyl acetate extract of the stem of rollinia pittieri and pseudomalmea boyacana (annonaceae), the alkaloids isolated from these were studied. of the alkaloids, liriodenine exhibited the highest activity against chloroquine sensitive and chloroquine resistant strains of plasmodium falciparum (ci50 = 8.0-10.0 μg/ml). in addition, inhibition of ?-hematin formation (if?-h) by isolated compounds was evaluated (if?-h). o-methylmoschatoline and melosmine showed inhibition percentage >96% at 2 mg/ml. some degree of cytotoxic to u-937 cells activity was observed by oxoporphine alkaloids.
LOS JUGOS DE CíTRICOS INHIBEN LA OXIDACIóN DE LIPOPROTEíNAS DE BAJA DENSIDAD: RELACIóN ENTRE ACTIVIDAD CAPTADORA DE RADICALES LIBRES Y MOVILIDAD ELECTROFORéTICA CITRUS JUICE INHIBITS LOW DENSITY LIPOPROTEIN OXIDATION: RELATIONSHIP BETWEEN FREE RADICAL SCAVENGER ACTIVITY AND ELECTROPHORETIC MOBILITY
Julián Londo?o L,Guillermo Montoya P,Karina Guerrero M,Leidy Aristizabal
Revista Chilena de Nutricíon , 2006,
Abstract: Estudios epidemiológicos han demostrado que el consumo de frutas y vegetales se asocia con efectos beneficiosos sobre la salud humana, incluyendo reducción del riesgo de enfermedades cardiovasculares (ECV). Las frutas y sus jugos contienen compuestos que inhiben la oxidación de Lipoproteínas de Baja Densidad (LDL), un proceso clave en el desarrollo de la lesión arterial. Se ha desarrollado un estudio para determinar el contenido de compuestos fenólicos, la actividad captadora de radicales libres y el efecto sobre la oxidación de LDL, de jugos de cítricos cultivados en el suroeste de Antioquia (Colombia). Cinco variedades de cítricos fueron analizadas: Citrus sinensis valencia, Citrus reticulata clementina, Citrus reticulata oneco, Tangelo orlando, Tangelo mineola. Se demostró que en estos jugos no existe correlación entre el contenido de compuestos fenólicos y la actividad captadora de radicales libres (ACRL), sin embargo, se encontró una alta capacidad para inhibir la oxidación de LDL Epidemiological studies have shown that consumption of fruits and vegetables are associated with beneficial effects on human health including the reduction of coronary artery disease (CAD) risk. Fruits and their juices contain phytochemicals that inhibit in vitro the low-density lipoprotein (LDL) oxidation, a key process involved in the generation of arterial lessions. We developed an study to examine the phenolics compound content of citrus juice cultivated in the southwest of Antioquia, Colombia, its free radical scavenger activity and in vitro effect on LDL oxidation. Five citrus varieties were analyzed: Citrus sinensis valencia, Citrus reticulata clementina, Citrus reticulata oneco, Tangelo Orlando and Tangelo mineola. The results showed that no correlation exists between phenolic compounds content and free radical scavenger activity in the citrus juices analyzed. However a high inhibitory capacity of LDL oxidation was found
Fisiopatología del síndrome de Guillain Barré axonal Physiopathology of axonal acute Guillain Barré syndrome
Beatriz Aguirre L.,Jaime Carrizosa Moog,Diana P. Martínez T.,Juan Guillermo Montoya Ch.
Iatreia , 2002,
Abstract: Se describe la fisiopatología del síndrome de Guillain Barré axonal. Se consideran especialmente cinco aspectos: 1) Agentes etiológicos, específicamente el Campylobacter jejuni. 2) Susceptibilidad genética humana. 3) Mimetismo molecular entre lipopolisacáridos y lipoproteínas. 4) Mecanismo de acción de los anticuerpos antigangliósidos y 5) Hallazgos patológicos. The physiopathology of axonal acute Guillain Barré syndrome is described. Five aspects are considered, namely: 1) Etiologic agents emphasizing on Campylobacter jejuni. 2) Human genetic predisposition. 3) Molecular mimicry between lipopolysaccharides and gangliosides. 4) Mechanisms of action of antiganglioside antibodies and, 5) Pathologic findings.
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