Voltammetric determination of caffeine in beverage samples on bare boron-doped diamond electrode

Švorc, Ľubomír; Tomčı́k, Peter; Svítková, Jana; Rievaj, Miroslav; Bustin, Dušan

doi:10.1016/j.foodchem.2012.05.052

Cited by 122 publications

(76 citation statements)

References 29 publications

(34 reference statements)

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“…Therefore, choosing the right analytical method is essential for the accurate determination of caffeine in test samples. There have been numerous reports on the determination of caffeine in coffee samples following different analytical methods: gas chromatography [15,17,18], electrochemical methods such as voltammetry [19], and spectroscopic techniques including nuclear magnetic resonance spectroscopy [20], near infrared [21], high performance liquid chromatography [5,8,22,23], UV-Vis spectroscopy [4,7,24,25] and fluorescence spectroscopy [26]. However, there are only limited reports available on the comparative study of caffeine determination by different analytical methods for a given set of samples [5,23].…”

Section: Introductionmentioning

confidence: 99%

Correlation between caffeine contents of green coffee beans and altitudes of the coffee plants grown in southwest Ethiopia

Hagos¹,

Redi‐Abshiro²,

Chandravanshi³

et al. 2018

Bull. Chem. Soc. Eth.

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ABSTRACT. Caffeine contents of 45 green coffee bean samples collected from coffee plants grown at different altitudes in Southwest Ethiopia was determined by UV-Vis spectrophotometry. The caffeine contents were found in the range of 0.62 -1.2% (w/w). A moderate negative correlation (R = 0.5463) was found between the caffeine contents of green coffee beans and the altitudes at which the coffee plants were grown. The caffeine contents of 9 of the green coffee bean samples analyzed by high performance liquid chromatography (HPLC) provided comparable results in the range of 0.60−1.1% (w/w). Statistical analysis of data (t-test) indicated absence of significant differences between the caffeine contents obtained by the two methods. Nonetheless, HPLC method is precise, accurate and reliable in determining caffeine content in green coffee bean samples while the UV-Vis spectrophotometry is simple, rapid, precise and more economical.

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Section: Introductionmentioning

confidence: 99%

Correlation between caffeine contents of green coffee beans and altitudes of the coffee plants grown in southwest Ethiopia

Hagos¹,

Redi‐Abshiro²,

Chandravanshi³

et al. 2018

Bull. Chem. Soc. Eth.

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“…General overviews of the methods employed for determining caffeine and taurine in various matrices can be found in a number of reviews, for example [3][4][5]. The most frequently used methods are LC (HPLC) and CE-for determining caffeine MEKC, or GC.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous and rapid determination of caffeine and taurine in energy drinks by MEKC in a short capillary with dual contactless conductivity/photometry detection

2013

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A method has been developed for the simultaneous determination of taurine and caffeine using a laboratory-made instrument enabling separation analysis in a short 10.5 cm capillary. The substances are detected using a contactless conductometry/ultraviolet (UV) photometry detector that enables recording both signals at one place in the capillary. The separation of caffeine and taurine was performed using the MEKC technique in a BGE with the composition 40 mM CHES, 15 mM NaOH, and 50 mM SDS, pH 9.36. Under these conditions, the migration time of caffeine is 43 s and of taurine 60 s; LOD for caffeine is 4 mg/L using photometric detection and LOD for taurine is 24 mg/L using contactless conductometric detection. The standard addition method was used for determination in Red Bull energy drink of caffeine 317 mg/L and taurine 3860 mg/L; the contents in Kamikaze drink were 468 mg/L caffeine and 4110 mg/L taurine. The determined values are in good agreement with the declared contents of these substances. RSD does not exceed 3%.

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“…As reported in previous works, an equal number of electrons and protons is transferred in the electrochemical oxidation of CTP (4e -and 4H + ) 21,22 and CAF (4e -and 4H + ). [23][24][25] In addition, scan rate studies carried out by cyclic voltammetry show that the electrode processes for both CTP and CAF are controlled by diffusion. 9,23 On the other hand, investigations on the electrochemical mechanism of DIP were difficult to be obtained due to its poorly defined oxidation peak (near to background discharge potentials).…”

Section: Resultsmentioning

confidence: 99%

“…[23][24][25] In addition, scan rate studies carried out by cyclic voltammetry show that the electrode processes for both CTP and CAF are controlled by diffusion. 9,23 On the other hand, investigations on the electrochemical mechanism of DIP were difficult to be obtained due to its poorly defined oxidation peak (near to background discharge potentials). As previously suggested, the oxidation mechanism of a tertiary aliphatic amine (DIP) tends to generate a N-radical with fast cleavage to aldehydes and aliphatic amines.…”

Section: Resultsmentioning

confidence: 99%

Amperometric determination of 8-chlorotheophylline, caffeine, and diphenhydramine in a single run

Freitas¹,

Oliveira²,

Muñoz³

et al. 2017

Quim. Nova

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publicado na web em 15/05/2017 A simple method for simultaneous determination of 8-chlorotheophylline (CTP), caffeine (CAF), and diphenhydramine (DIP) using batch-injection analysis with multiple pulse amperometric detection (BIA-MPA) is reported. A sequence of three potential pulses (+1.10 V, +1.40 V, and +1.70 V) was applied to the boron-doped diamond working electrode with the acquisition of three distinct amperograms. CTP was detected selectively at +1.10 V, both CTP + CAF at +1.40 V and CTP + CAF + DIP at +1.70 V. The subtraction between the currents detected at the three potential pulses (with the use of correction factors) was the strategy used to achieve selectivity for the determination of CAF and DIP. The proposed method is simple, inexpensive, fast (120 injections h -1 ), presents good precision (RSD < 0.9%; n = 20), and adequate limits of detection (0.31, 0.49, and 0.76 µmol L -1 for CTP, CAF and DIP, respectively). The results obtained by BIA-MPA were similar to those found by high-performance liquid chromatography (95% confidence level).

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Voltammetric determination of caffeine in beverage samples on bare boron-doped diamond electrode

Cited by 122 publications

References 29 publications

Correlation between caffeine contents of green coffee beans and altitudes of the coffee plants grown in southwest Ethiopia

Correlation between caffeine contents of green coffee beans and altitudes of the coffee plants grown in southwest Ethiopia

Simultaneous and rapid determination of caffeine and taurine in energy drinks by MEKC in a short capillary with dual contactless conductivity/photometry detection

Amperometric determination of 8-chlorotheophylline, caffeine, and diphenhydramine in a single run

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