Electrochemical determination of 8-hydroxyquinoline in a cosmetic product on a glassy carbon electrode modified with 1-amino-2-naphthol-4-sulphonic acid

Abstract

A new voltammetric method was developed for the simple, rapid and inexpensive determination of 8-hydroxyquinoline (8HQ) on a modified electrode obtained by the electrodeposition of 1-amino-2-naphthol-4-sulfonic acid (ANSA) on the surface of a glassy carbon (GC) electrode. The electrode interfacial properties were investigated by electrochemical impedance spectroscopy (EIS). The electrochemical response of the ANSA-GC electrode toward 8-hydroxyquinoline was investigated by the use of square wave voltammetry. The ANSA-GC modified electrode showed two linear plots with 8hydroxyquinoline concentrations from 5 Â 10 À7 to 1.4 Â 10 À5 mol dm À3 (R 2 of 0.9984) and from 1.4 Â 10 À5 to 4.25 Â 10 À4 mol dm À3 with a correlation coefficient R 2 equal to 0.9967. The limit of detection was 1.6 Â 10 À7 mol dm À3 . The ANSA-GC modified electrode also showed excellent stability and reproducibility for up to two weeks. The analytical application of the ANSA-GC modified electrode was investigated for the determination of 8-hydroxyquinoline in a blush cosmetic product. The results in good agreement to those obtained by spectrophotometry as a standard method.

Selective and Sensitive Determination of Paracetamol and Levodopa with Using Electropolymerized 3,5‐Diamino‐1,2,4‐triazole Film on Glassy Carbon Electrode

“…In the studies of determination of various ions or compounds, choosing the appropriate electrolyte and its pH is important [65]. The supporting electrolyte solution is effective on the values of peak potential and peak current in the voltammetric measurements [66, 67]. Most previous literature reports indicate that a neutral [28, 68] or slightly alkaline [1, 69, 73] media was used as the supporting electrolyte solution for the determination of L‐DOPA and PAR.…”

Electrochemical Behavior and Ultrasensitive, Simple and Effective Voltammetric Determination of Acetaminophen Using Modified Glassy Carbon Electrode Based on 4‐Hydroxyquinoline‐3‐carboxylic Acid

“…FT‐IR measurements were used to characterize 4HQ3CA/GC and investigate the binding sites of the 4HQ3CA film to the GC surface [39]. Bare GC electrode surface spectra were obtained and taken away from the modified surface spectra to get the film spectra of the grafted 4HQ3CA.…”

Atomically dispersed Fe–Zn dual-site nanozymes with synergistic catalytic effects for the simultaneous detection of Cr(vi) and 8-hydroxyquinoline

“…6 Currently, the effects of 8-HQ on human health are still being investigated, but it has been reported that the carcinogenic effect of 8-HQ can be observed after implantation in the bladder of mice. 7 Due to the widespread use of 8-HQ in cosmetics and its potential toxicity to mammalian cells, European Union Council Directive 76/768/EEC stipulates that 8-HQ is not allowed to be used in cosmetics other than hair care products. 7 The maximum authorized concentrations for rinse and non-rinse hair care products were 0.3% and 0.03% (w/w), respectively.…”

“…7 Due to the widespread use of 8-HQ in cosmetics and its potential toxicity to mammalian cells, European Union Council Directive 76/768/EEC stipulates that 8-HQ is not allowed to be used in cosmetics other than hair care products. 7 The maximum authorized concentrations for rinse and non-rinse hair care products were 0.3% and 0.03% (w/w), respectively. 8…”