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dc.contributor.author
Parolo, Maria Eugenia
dc.contributor.author
Avena, Marcelo Javier
dc.contributor.author
Savini, Monica Claudia
dc.contributor.author
Baschini, Miria Teresita
dc.contributor.author
Nicotra, Viviana Estela
dc.date.available
2020-04-03T20:54:12Z
dc.date.issued
2013-01
dc.identifier.citation
Parolo, Maria Eugenia; Avena, Marcelo Javier; Savini, Monica Claudia; Baschini, Miria Teresita; Nicotra, Viviana Estela; Adsorption and circular dichroism of tetracycline on sodium and calcium-montmorillonites; Elsevier Science; Colloids and Surfaces A: Physicochemical and Engineering Aspects; 417; 1-2013; 57-64
dc.identifier.issn
0927-7757
dc.identifier.uri
http://hdl.handle.net/11336/101971
dc.description.abstract
The interaction of tetracycline (TC) with a Na+-montmorillonite and a Ca2+-montmorillonite in aqueous media was investigated using a batch technique complemented with X-ray diffraction (XRD) and circular dichroism (CD). The adsorption of TC decreases by increasing the pH in both cases, although Ca2+-montmorillonite is a more effective adsorbent than Na+-montmorillonite in the pH range 6-8.5. In both cases, TC locates in the interlayer spacing, increasing the d 001 basal spacing from nearly 13.7 Å to nearly 22.0 Å. CD data of TC solutions indicates that increasing the pH induces structural changes from the twisted conformation to the extended conformation of the TC molecule. The presence of Ca2+ in the solution enhances this effect in the pH range 6-10.5. Adsorption on Na+-montmorillonite and Ca2+-montmorillonite significantly induces the adoption of the extended conformation of TC. Chelation of TC with Ca2+ ions in the interlayer is also demonstrated. Therefore, Ca2+ ions in the interlayer behave as active sites for TC adsorption on montmorillonite, leading to the formation of montmorillonite-Ca 2+-TC complexes. The conformational changes that TC suffers upon adsorption may have important effects on the bioavailability and antimicrobial activity of the antibiotic.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
TETRACYCLINE
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MONTMORILLONITE
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CIRCULAR DICHROISM
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ADSORPTION
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Química Coloidal
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Ciencias Químicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Adsorption and circular dichroism of tetracycline on sodium and calcium-montmorillonites
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-04-02T15:10:57Z
dc.journal.volume
417
dc.journal.pagination
57-64
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Parolo, Maria Eugenia. Universidad Nacional del Comahue; Argentina
dc.description.fil
Fil: Avena, Marcelo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Argentina
dc.description.fil
Fil: Savini, Monica Claudia. Universidad Nacional del Comahue; Argentina
dc.description.fil
Fil: Baschini, Miria Teresita. Universidad Nacional del Comahue; Argentina
dc.description.fil
Fil: Nicotra, Viviana Estela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
dc.journal.title
Colloids and Surfaces A: Physicochemical and Engineering Aspects
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.colsurfa.2012.10.060
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0927775712007479
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