Characterization of several stationary phases prepared by thermal immobilization of poly(methyltetradecylsiloxane) onto silica surfaces

dc.creatorBorges, EM
dc.creatorCollins, CH
dc.date2011
dc.date42186
dc.date2014-07-30T16:51:59Z
dc.date2015-11-26T16:33:22Z
dc.date2014-07-30T16:51:59Z
dc.date2015-11-26T16:33:22Z
dc.date.accessioned2018-03-28T23:15:12Z
dc.date.available2018-03-28T23:15:12Z
dc.identifierJournal Of Chromatography A. Elsevier Science Bv, v. 1218, n. 28, n. 4378, n. 4388, 2011.
dc.identifier0021-9673
dc.identifierWOS:000292718800014
dc.identifier10.1016/j.chroma.2011.05.007
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/62887
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/62887
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1270828
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionVariations of a thermal immobilization procedure using poly(methyltetradecilsiloxane) and silica produced fourteen stationary phases with carbon contents of 4-18%. The stationary phases were chromatographically evaluated with the Engelhardt. SRM 870 and Tanaka tests. Classifications using USP and Euerby procedures indicate that the new immobilized phases are different from most commercial phases although there was some similarity with phases that have high ion-exchange interactions. The retention mechanism involved in the separation of basic solutes on several of the new stationary phases was studied by varying pH, type of Lewis base and the ionic strength of the eluent. The separations are strongly influenced by the chemistry of the accessible free silanols. The stationary phases present good selectivity at intermediate pH where the basic analytes were protonated, suggesting use of intermediate pH for these separations. Stability tests show that the stationary phases have poor stability at very high pH, even at 23 degrees C, but good stability in acidic mobile phases, even at 75 degrees C. as expected for an immobilized polymer stationary phase. (C) 2011 Elsevier B.V. All rights reserved.
dc.description1218
dc.description28
dc.description4378
dc.description4388
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionMedley (Campinas, Brazil)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationJournal Of Chromatography A
dc.relationJ. Chromatogr. A
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectReversed-phase stationary phases
dc.subjectPoly(methyltetradecylsiloxane)
dc.subjectSilanol activity
dc.subjectChemical and thermal stabilities
dc.subjectLewis acid-base interactions
dc.subjectBasic solutes
dc.subjectPerformance Liquid-chromatography
dc.subjectPolybutadiene-coated Zirconia
dc.subjectReversed-phase
dc.subjectBasic Compounds
dc.subjectRetention
dc.subjectStability
dc.subjectHplc
dc.subjectPolysiloxanes
dc.subjectParticles
dc.subjectColumns
dc.titleCharacterization of several stationary phases prepared by thermal immobilization of poly(methyltetradecylsiloxane) onto silica surfaces
dc.typeArtículos de revistas


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