A fast and efficient method for the study of caffeine levels in energy drinks using micellar electrokinetic chromatography (MEKC)

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منابع مشابه

A fast and efficient method for the study of caffeine levels in energy drinks using micellar electrokinetic chromatography (MEKC) Um método eficiente e rápido para determinação de cafeína em bebidas energéticas usando a técnica de eletroforese capilar (MEKC)

Received 29/9/2011 Accepted 23/12/2011 (005487) 1 Department of Food Science, Faculty of Food Engineering, University of Campinas – UNICAMP, 13083-862, Campinas, SP, Brazil, e-mail: [email protected] 2 Water and Soil Department, Faculty of Agricultural Engineering, University of Campinas – UNICAMP, Cidade universitária Zeferino Vaz, Barão Geraldo, CEP 13083-970, Campinas, SP, Brazil *Corres...

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Micellar electrokinetic chromatography (MEKC) separation of furanonaphthoquinones from Tabebuia impetiginosa.

The separation of nine furanonaphthoquinones by micellar electrokinetic chromatography (MEKC) is described. The running electrolytes used in this method were 0.03 M sodium dodecyl sulphate (SDS) in 0.09 M borate buffer (pH 9) containing 10% methanol, with an applied voltage of 20 kV. Application of this technique in the determination of the main furanonaphthoquinones, 5-hydroxy-2-(1-hydroxyethy...

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Comparison of the use of single capillaries and coupled capillaries based on micellar electrokinetic chromatography (MEKC) and sweeping-MEKC modes.

The use of single capillaries (25 and 50 microm inner diameter (ID)) and coupled capillaries of different diameters (100-50 and 75-25 microm ID) based on micellar electrokinetic chromatography (MEKC) and sweeping-MEKC modes is compared and reported. Naphthalene-2,3-dicarboxaldehyde (NDA)-derivatized dopamine was selected as the model compound by examining the fluorescence intensity when a viole...

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Rapid analysis of caffeine in "smart drugs" and "energy drinks" by microemulsion electrokinetic chromatography (MEEKC).

A novel method based on microemulsion electrokinetic chromatography (MEEKC) with diode array detection (DAD) for rapid determination of caffeine in commercial and clandestine stimulants, known as "energy drinks" and "smart drugs", is described. Separations were carried out in 50 cm × 50 μm (ID) uncoated fused silica capillaries. The optimized buffer electrolyte was composed of 8.85 mM sodium te...

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Modeling The Capacity Factor of Analytes in Micellar Electrokinetic Chromatography Using Computational Descriptors

       A multiple linear regression model is proposed to calculate capacity factor of  analytes using structural features computed using HyperChem software. The  chemical descriptors of analytes were computed using HyperChem software and  regressed against the experimental capacity factors of analytes collected from the  literature. The absolute average percentage deviation (AARD) and individua...

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ژورنال

عنوان ژورنال: Food Science and Technology

سال: 2012

ISSN: 1678-457X,0101-2061

DOI: 10.1590/s0101-20612012005000042