Laboratory of Analytical Chemistry, Department of Chemistry, University of Athens, 157 71 Athens, Greece; Charles University in Prague, Faculty of Science, Department of Analytical Chemistry, University Research Centre Supramolecular Chemistry, UNESCO Laboratory of Environmental Electrochemistry, Albertov 6, CZ-128 43 Prague 2, Czech Republic.
Laboratory of Analytical Chemistry, Department of Chemistry, University of Athens, 157 71 Athens, Greece.
Talanta. 2018 Feb 1;178:231-236. doi: 10.1016/j.talanta.2017.09.032. Epub 2017 Sep 12.
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 0.040M Britton-Robinson buffer was used both as a carrier solution and for dilution of analyzed solutions before injection. The method is precise (RSD < 5%, n = 10), fast (a frequency of 140 injections h), provides sufficiently low quantification limits (2.51, 1.45, and 0.85μmolL 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.
我们报告了一种使用流动注射分析结合多脉冲安培法同时测定叔丁基对苯二酚（tBHQ）、没食子酸丙酯（PG）和丁基羟基茴香醚（BHA）的电流测定法。为了在不进行初步分离的情况下，在单个注射步骤中在玻碳电极上分别检测 tBHQ、PG 和 BHA，选择了一系列的电位脉冲。甲醇和 0.040M Britton-Robinson 缓冲液的混合物既用作载流溶液，也用作分析溶液在注射前的稀释剂。该方法具有较高的精度（RSD < 5%，n = 10），较快的速度（频率为 140 次/小时），提供了足够低的定量限（分别为 2.51、1.45 和 0.85μmolL 用于 tBHQ、PG 和 BHA），并且可以轻松应用，对仪器的要求不高。作为实际应用，通过应用简单的提取程序，对商业口香糖样品中这些抗氧化剂的含量进行了测定。
