This paper reports a novel analytical device for the determination of 2‐(1,1‐dimethylethyl)‐1,4‐benzenediol antioxidant (TBHQ) in cosmetic samples exploiting a photoelectrochemical sensor based on titanium dioxide nanoparticles sensitized with lithium 7,7′,8,8′‐tetracyanoquinodimethanide on indium tin oxide electrode. The proposed photoelectrochemical sensor possesses the capacity of harvesting light energy from a commercial light‐emitting diode (LED) lamp for the determination of TBHQ molecules. The photoelectrochemical sensor presented photocurrent response to antioxidant about 2‐fold higher than pure titanium dioxide. The sensor shows high photocurrent response to TBHQ antioxidant in comparison to photocurrent response to 2,3‐t‐butyl‐4‐hydroxyanisole and 2,6‐Di‐tert‐butyl‐4‐methylphenol, indicating selectivity to TBHQ. Under optimized experimental conditions, the photoelectrochemical sensor presents two linear ranges of response for the analyte, the former from 0.6 to 200 μmol L⁻¹, and the latter from 200 to 5000 μmol L⁻¹. A low limit of detection of 0.17 μmol L⁻¹ was obtained for the proposed photoelectrochemical sensor. The sensor was successfully employed to the analysis of cosmetic samples, with recovery values between 96 % and 98 %.

中文翻译：

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发光二极管辅助测定用7,7'，8,8'-三苯甲基氨基喹喔啉锂敏化的TiO2的化妆品样品中的2-（1,1-二甲基乙基）-1,4-苯二酚

本文报道了一种新颖的分析装置，该方法利用基于7,7'锂敏化的二氧化钛纳米粒子的光电化学传感器，用于测定化妆品样品中的2-（1,1-二甲基乙基）-1,4-苯二酚抗氧化剂（TBHQ）。氧化铟锡电极上的8,8'-四氰基喹二甲基甲烷化物。所提出的光电化学传感器具有从商用发光二极管（LED）灯中收集光能的能力，可用于确定TBHQ分子。光电化学传感器对抗氧化剂的光电流响应比纯二氧化钛高约2倍。与对2,3-叔丁基-4-羟基茴香醚和2,6-二叔丁基-4-甲基苯酚的光电流响应相比，该传感器对TBHQ抗氧化剂具有高光电流响应，表明对TBHQ有选择性。^-1，后者为200至5000μmolL ^-1。所提出的光电化学传感器的检测下限为0.17μmolL ^-1。该传感器已成功用于化妆品样品的分析，回收率在96％至98％之间。