dc.creatorTalio, María Carolina
dc.creatorAcosta, Maria Gimena
dc.creatorAlesso, Magdalena
dc.creatorLuconi, Marta Olga
dc.creatorFernandez, Liliana Patricia
dc.date.accessioned2016-05-23T19:24:42Z
dc.date.accessioned2018-11-06T13:03:15Z
dc.date.available2016-05-23T19:24:42Z
dc.date.available2018-11-06T13:03:15Z
dc.date.created2016-05-23T19:24:42Z
dc.date.issued2014-06
dc.identifierTalio, María Carolina; Acosta, Maria Gimena; Alesso, Magdalena; Luconi, Marta Olga; Fernandez, Liliana Patricia; Quantification of caffeine in dietary supplements and energy drinks by solid-surface fluorescence using a pre-concentration step on multi-walled carbon nanotubes and Rhodamine B; Taylor & Francis; Food Additives & Contaminants: Part A; 31; 8; 6-2014; 1367-1374
dc.identifier1944-0049
dc.identifierhttp://hdl.handle.net/11336/5787
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1872465
dc.description.abstractA new method for the determination of caffeine, a non-fluorescent analyte, based on the enhancement of the fluorescence of Rhodamine B dye on a membrane filter modified with multi-walled carbon nanotubes is proposed. The method comprises the preconcentration of caffeine on solid support by chemofiltration in buffered solution onto multi-walled carbon nanotubes previously oxided and dispersed in a cationic surfactant admicelles. The effect of experimental parameters, included buffer nature and pH, solid support nature, filtration flow rate, dye and carbon nanotubes concentration, surfactant nature and concentration were investigated by means uni-variation assays. At the best experimental conditions, the preconcentration system provided the detection and quantification limits of is 0.3 µg L-1 and 1.1 µg L-1, respectively. A wide linear range varying from 1.1- 9.7x103 µg L-1 concentration (r2 = 0.999). The satisfactory recovery values obtains using standard addition method confirms the feasibility of this method for caffeine determination in energizing dietary supplements and energy drinks.
dc.languageeng
dc.publisherTaylor & Francis
dc.relationinfo:eu-repo/semantics/altIdentifier/url/http://www.tandfonline.com/doi/pdf/10.1080/19440049.2014.928831
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1080/19440049.2014.928831
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/10.1080/19440049.2014.928831
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectCAFFEINE MONITORING
dc.subjectRHODAMINE B
dc.subjectNYLON MEMBRANES
dc.subjectMULTI-WALLED CARBON NANOTUBES
dc.subjectSOLID SURFACE FLUORESCENCE
dc.titleQuantification of caffeine in dietary supplements and energy drinks by solid-surface fluorescence using a pre-concentration step on multi-walled carbon nanotubes and Rhodamine B
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


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