Light‐emitting Diode‐assisted Determination of 2‐(1,1‐Dimethylethyl)‐1,4‐Benzenediol in Cosmetic Samples Exploiting TiO2 Sensitized with Lithium 7,7′,8,8′‐Tetracyanoquinodimethanide.

Autor: Oliveira Monteiro, Thatyara, Costa dos Santos, Clenilton, Santos Damos, Flávio, de Cássia Silva Luz, Rita
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Zdroj: Electroanalysis; Apr2018, Vol. 30 Issue 4, p748-756, 9p
Abstrakt: Abstract: 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 %. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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