Journal
TALANTA
Volume 178, Issue -, Pages 231-236Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2017.09.032
Keywords
Flow injection analysis; Multiple-pulse amperometry; Glassy carbon electrode; Antioxidants
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Funding
- Czech Science Foundation [P206/12/G151]
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We report the first amperometric method for the simultaneous determination of tert-butylhydroquinone (tBHQ), propyl gallate (PG), and butylated hydroxyanisole (BHA) using flow injection analysis coupled to multiple-pulse amperometry. A sequence of potential pulses was selected in order to detect tBHQ, PG, and BHA separately in a single injection step at a glassy carbon electrode without the need of a preliminary separation. A mixture of methanol and 0.040 M Britton-Robinson buffer was used both as a carrier solution and for dilution of analyzed solutions before injection. The method is precise (RSD < 5%, It = 10), fast (a frequency of 140 injections h(-1)), provides sufficiently low quantification limits (2.51, 1.45, and 0.85 pmol L-1 for tBHQ, PG, and BHA, respectively) and can be easily applied without high demands on instrumentation. As a practical application, the determination of these antioxidants contained in commercial chewing gum samples was carried out by applying a simple extraction procedure.
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