Author： Pieszko C. Baranowska I. Flores A.
Publisher： MAIK Nauka/Interperiodica
ISSN： 1061-9348
Source： Journal of Analytical Chemistry, Vol.65, Iss.12, 2010-12, pp. : 1228-1234
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Abstract
The method of UV/VIS derivative spectrophotometry for the determination of caffeine and B vitamins in energy drinks after solid phase extraction has been developed. Caffeine has been determined in the mixture with B2 vitamin with zero-crossing technique from the I derivative spectra (λ = 266.8 nm), and B3 in mixture with B6 vitamin from the II derivative spectra (λ = 280.1 nm). B12 vitamin has also been determined in a three-component mixture with vitamins B3 and B6. Taurine in drinks has been determined from the basic spectra after derivatization with ninhydrin (λ = 570 nm).
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