Organically Structured Carbon Nanotubes for Fluorescence

Tang, Jianguo; Xu, Qingsong

doi:10.5772/16791

Cited by 1 publication

(1 citation statement)

References 75 publications

(95 reference statements)

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“…In this experimental condition, the obtained EF was 20, providing evidence about the improvement in the sensitivity of the proposed methodology for the MWCNTs. Nanomaterial activation was realised by oxidation (Osorio et al 2008;Tang & Xu 2011;Silva et al 2012) using different chemical substances. The chemical functionalisation by mean HNO 3 (2 mequiv.…”

Section: Resultsmentioning

confidence: 99%

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

Talio

Acosta

Alesso

et al. 2014

Food Additives & Contaminants: Part A

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A 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 pre-concentration of caffeine on a solid support by chemofiltration in buffered solution onto multi-walled carbon nanotubes previously oxidised and dispersed in cationic surfactant admicelles. The effect of experimental parameters, including the nature of the buffer and pH, the nature of the solid support, filtration flow rate, dye and carbon nanotube concentration, and the nature of the surfactant and concentration were investigated by means univariation assays. Under optimum experimental conditions, the pre-concentration system gave detection and quantification limits of 0.3 and 1.1 µg l(-1), respectively. A wide linear range was achieved varying from concentrations of 1.1 to 9.7 × 103 µg l(-1) (r(2) = 0.999). Satisfactory recovery values were obtained using the method of standard addition, confirming the feasibility of this method for caffeine determination in energising dietary supplements and energy drinks.

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Section: Resultsmentioning

confidence: 99%