Simultaneous determination of glyoxal, methylglyoxal and diacetyl in beverages using vortex-assisted liquid–liquid microextraction coupled with HPLC-DAD

A rapid and inexpensive clean-up method called vortex-assisted liquid–liquid microextraction (VALLME) was successfully applied to purify beverages (tea drinks, soft drinks and carbonated drinks) containing α-dicarbonyl compounds after derivatization with o-phenylenediamine.