Article
Synthesis of hybrid adsorbents combining sol-gel processing and molecular imprinting applied to lead removal from aqueous streams
Fecha
2009Autor
Mendoza-Diaz, G.
Bivian-Castro, E.Y.
Lpez, M.G.
Pedraza-Reyes, M.
Berns, S.
Institución
Resumen
A mixed copper complex with deprotonated nalidixic acid (nal) and histamine (hsm) was synthesized and characterized by FTIR, UV-Vis, elemental analysis, and conductivity. The crystal structure of [Cu(hsm)(nal) H2 O]Cl 3 H2 O (chn) showed a pentacoordinated cooper(II) in a square pyramidal geometry surrounded by two N atoms from hsm, two O atoms from the quinolone, and one apical water oxygen. Alteration of bacterial DNA structure and/or associated functions in vivo by [Cu(hsm)(nal) H2 O]Cl 3 H2 O was demonstrated by the induction of a recA-lacZ fusion integrated at the amyE locus of a recombinant Bacillus subtilis strain. Results from circular dichroism and denaturation of calf thymus DNA (CT-DNA) suggested that increased amounts of copper complex were able to stabilize the double helix of DNA in vitro mainly by formation of hydrogen bonds between chn and the sugars of DNA minor groove. In vivo and in vitro biological activities of the chn complex were compared with the chemical nuclease [Cu(phen)(nal) H2 O]N O 3 3 H2 O (cpn) where phen is phenanthroline. Copyright " 2009 Egla Yareth Bivián-Castro et al.",,,,,,"10.1155/2009/603651",,,"http://hdl.handle.net/20.500.12104/44953","http://www.scopus.com/inward/record.url?eid=2-s2.0-68149183571&partnerID=40&md5=dba1a2da4e3e52010ff86cb04f0a2241",,,,,,,,"Bioinorganic Chemistry and Applications",,,,"2009",,"Scopus WOS",,,,,,,,,,,,"Synthesis, characterization, and biological activity studies of copper(ii) mixed compound with histamine and nalidixic acid",,"Article"
"46753","123456789/35008",,"Gutiérrez, R.Y.R., Departamento de Reproducción Humana Y Crecimiento Y Desarrollo Infantil, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Jal, Mexico; Marín, J.B., Departamento de Reproducción Humana Y Crecimiento Y Desarrollo Infantil, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Jal, Mexico; Molina, J.P., Departamento de Reproducción Humana Y Crecimiento Y Desarrollo Infantil, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Jal, Mexico, C. Salvador Quevedo y Zubieta 750, colonia Independencia, Guadalajara 44340, Jalisco, Mexico",,"Gutierrez, R.Y.R. Marin, J.A.B. Molina, J.P.",,"2009",,"Objective: To identify if pregnancy in adolescence is a risk factor for fetal abuse. Material and method: A case-control study of 333 mothers that made fetal abuse and its controls, was made between October 2005 and May 2006 at the Nuevo Hospital Civil de Guadalajara Dr. Juan I. Menchaca. The fetal abuse was considered when the prenatal attention was deficient and was documented illicit drugs or physics violence to the mother. The fetal abuse was documented by means of a direct interview to the mother. Was realized a descriptive analyze of different forms of fetal abuse. The Odds ratio was calculated for association between adolescent mother and fetal abuse. Results: The prenatal attention was deficient in 284 (69.7%), illicit drugs abuse in 100 (24.5%) and physics violence to the mother en 69 (20.7%). The adolescent mothers had more deficient prenatal attention that adult mothers (54 vs 37.7%), used more illicit drugs (25.6 vs 16.6%) and received more physics violence (4.9 vs 2.8%). The pregnancy in adolescent was associated with fetal abuse OR: 1.9 (95% CI: 1.39-2.71). Conclusions: The pregnancy in adolescent is a risk factor to fetal abuse and the form more frequent was the deficient prenatal attention.",,,,,,,,,"http://hdl.handle.net/20.500.12104/44974","http://www.scopus.com/inward/record.url?eid=2-s2.0-67849132159&partnerID=40&md5=6ca98cb5d732bd7b65e07ef18157003e",,,,,,"7",,"Ginecologia y Obstetricia de Mexico",,"311 316",,"77",,"Scopus",,,,,,"Fetal abuse; Pregnancy in adolescent; Prenatal attention; Risk factors",,,,,,"Teenage pregnancy as a risk factor for fetal abuse [Embarazo en adolescentes como factor de riesgo para maltrato fetal]",,"Article"
"46721","123456789/35008",,"Quirarte-Escalante, C.A., Departamento de Ingenieria Quimica, Universidad de Guadalajara, Centro UniVersitario de Ciencias Exactas e Ingenierías, Blvd. Marcelino García Barragán #1451, Guadalajara, Jalisco 44430, Mexico; Soto, V., Departamento de Quimica, Universidad de Guadalajara, Centro UniVersitario de Ciencias Exactas e Ingenierías, Blvd. Marcelino García Barragán #1451, Guadalajara, Jalisco 44430, Mexico; De La Cruz, W., Centro de Ciencias de la Materia Condensada, Universidad Nacional Autónoma de Mexico, km 107 Carretera Tijuana-Ensenada, Ensenada, B.C. 22830, Mexico; Porras, G.R., Centro de InVestigaciones en Química Inorganica, UniVersidad de Guanajuato, Noria Alta s/n, Colonia Noria Alta, Guanajuato, Guanajuato 36050, Mexico; Manríquez, R., Institut for Chemie and Biochemie, Freie Universityt Berlin, Takustrasse 3, Berlin D-14195, Germany; Gomez-Salazar, S., Departamento de Ingenieria Quimica, Universidad de Guadalajara, Centro UniVersitario de Ciencias Exactas e Ingenierías, Blvd. Marcelino García Barragán #1451, Guadalajara, Jalisco 44430, Mexico",,"Quirarte-Escalante, C.A. Soto, V. De La Cruz, W. Porras, G.R. Manriquez, R. Gomez-Salazar, S.",,"2009",,"Two high-capacity thiol functionalized adsorbents are prepared, using sol-gel processing, and applied to the removal of lead(II) from aqueous streams. The first adsorbent (SN) is prepared by co-condensing oligomers of tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPS); the second adsorbent (MI) is synthesized by a combined co-condensation/molecular imprinting route of TEOS and MPS. The resulting physicochemical properties of adsorbents are investigated by nitrogen sorption measurements, elemental analysis, Fourier transform infrared spectroscopy (FTIR), solid-state 13C and 29Si crosspolarization magic angle spinning nuclear magnetic resonance (13C and 29Si CPMAS NMR, respectively), and X-ray photoelectron spectroscopy (XPS). The adsorbents exhibit high ligand densities (1.19 mmol/g for SN and 1.03 mmol/g for MI), improved Brunauer-Emmett-Teller (BET) surface areas (SBET ) 129 m 2/g for SN and 464 m2/g for MI), and highly developed mesoporosity (Dp ) 15.1 nm for SN and 8.3 nm for MI). 29Si CPMAS NMR measurements indicate that the silicon oxide solid structure of adsorbents is not modified by lead adsorption. XPS results indicate the presence of lead acetate species on the surface of adsorbents. Batch adsorption data are explained by a mechanism in which a hydrated species (Pb(OOCCH 3)(H2O)5 +) forms a monodentate complex with thiol surface groups. Further characterization of the adsorbents shows rapid adsorption kinetics and equilibrium lead(II) adsorption capacities of 1.13 and 0.715 mmol/g for SN and MI. Lead adsorption dynamics in a packed column indicates high lead uptakes (155 and 80 mg Pb/g-adsorbent for SN and MI, respectively). Combined and simple sol-gel synthesis routes for preparation of adsorbents with high ligand densities and mesoporous structures are demonstrated here. " 2009 American Chemical Society.