Caffeine monitoring in biological fluids by solid surface fluorescence using membranes modified with nanotubes

Talio, María Carolina; Alesso, Magdalena; Acosta, Mariano; Acosta, María Gimena; Luconi, Marta Olga; Fernández, Liliana Patricia

doi:10.1016/j.cca.2013.07.008

Cited by 12 publications

(11 citation statements)

References 35 publications

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“…However, when the system was filtered through a nylon membrane as a solid support, an increase in the fluorescent signal of RhB retained on the solid support (SSF) was observed. Additionally, in the presence of CNTs, the RhB SSF was more increased (Talio et al 2013). This fact reinforces the theory of the existence of an association between RhB and CF, with an extra advantage in relation to the sensitivity due to the elevated superficial area of nanomaterials when SSF is used ( Figure 1).…”

Section: Resultssupporting

confidence: 85%

“…However, chemical associations of fluorescent dyes with this alkaloid have been reported (Zdunek et al 2000;Bedner et al 2001;Talio et al 2013). This fact can be used as a starting point for the development of an analytical methodology in order to achieve CF determination by molecular fluorescence.…”

Section: Resultsmentioning

confidence: 99%

“…In order to determine CF at low levels in these samples, analytical methodologies with high sensitivity and adequate selectivity are necessary (Jacob et al 2004). Diverse analytical methods have been proposed for CF determination and for the quality control of its associated products: these include spectrophotometry, fluorimetry, polarography, voltammetry, GC and HPLC (Fernández et al 2000;Tsuda et al 2000;Dinç et al 2001;Alpdogan et al 2002;Guo et al 2011;Talio et al 2013;Sereshti & Samadi 2014). The spectrophotometric methods lack adequate sensitivity for the determination of analytes at trace levels.…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

“…Recently, a novel SPE method using multi-walled carbon nanotubes (MWCNTs) as the adsorbent was developed (Barbosa et al 2007;Talio et al 2013). The functionalisation of MWCNTs can introduce on their surface site oxygen-containing negatively charged functional groups.…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

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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: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Please Scroll Down For Articlementioning

confidence: 99%

Section: Please Scroll Down For Articlementioning

confidence: 99%

See 2 more Smart Citations

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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“…This technique provides a significant increase in the sensitivity and selectivity of fluorescence analysis. SSF was applied for determination of organic and inorganic compounds in various media [3][4][5]. SSF analysis of polycyclic aromatic hydrocarbons (PAH) is of particular interest.…”

Section: Introductionmentioning

confidence: 99%

Solvent Effect on the Solid-Surface Fluorescence of Pyrene on Cellulose Diacetate Matrices

Rogacheva

Волкова

Otradnova

et al. 2018

International Journal of Optics

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The effect of the solvent nature (acetonitrile, ethanol, dimethyl sulfoxide, and dioxane) and its concentration on the fluorescence intensity of pyrene sorbed on the cellulose diacetate (CDA) film from a water-organic solution was studied. Dimethyl sulfoxide and ethanol are shown to be the most effective solvent additives for pyrene solid-surface fluorescence (SSF). The maximum SSF signal of pyrene was found upon sorption of the substance from aqueous media containing 1.2-4.2 vol% DMSO. For the pyrene quantitation the concentration dependence of its SSF intensity at the maximum of the spectrum at em = 394 nm and exp = 320 nm was plotted. The dependence has a linear character in the pyrene concentration range 2⋅10 −6 -2⋅10 −8 g/L, and the limit of pyrene detection is 2⋅10 −11 g/L. The possibility of determining benzo(a)pyrene using SSF technique with the CDA matrix is proved. The proposed method is promising for use in environmental monitoring of polycyclic aromatic hydrocarbons.

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Methods of biological fluids sample preparation – biogenic amines, methylxanthines, water‐soluble vitamins

Płonka

2014

Biomedical Chromatography

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In recent years demands on the amount of information that can be obtained from the analysis of a single sample have increased. For time and economic reasons it is necessary to examine at the same time larger number of compounds, and compounds from different groups. This can best be seen in such areas as clinical analysis. In many diseases, the best results for patients are obtained when treatment fits the individual characteristics of the patient. Dosage monitoring is important at the beginning of therapy and in the full process of treatment. In the treatment of many diseases biogenic amines (dopamine, serotonin) and methylxanthines (theophylline, theobromine, caffeine) play an important role. They are used as drugs separately or in combination with others to support and strengthen the action of other drugs -for example, the combination of caffeine and paracetamol. Vitamin supplementation may be also an integral part of the treatment process. Specification of complete sample preparation parameters for extraction of the above compounds from biological matrices has been reviewed. Particular attention was given to the preparation stage and extraction methods. This review provides universal guidance on establishing a common procedures across laboratories to facilitate the preparation and analysis of all discussed compounds.

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Caffeine monitoring in biological fluids by solid surface fluorescence using membranes modified with nanotubes

Cited by 12 publications

References 35 publications

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

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

Solvent Effect on the Solid-Surface Fluorescence of Pyrene on Cellulose Diacetate Matrices

Methods of biological fluids sample preparation – biogenic amines, methylxanthines, water‐soluble vitamins

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