@Article{SilvaQuiZanCorFat:2023:AmFlIn,
author = "Silva, Tiago Almeida and Quint{\~a}o, Herlon Charlles Moura and
Zanin, Hudson and Corat, Evaldo Jos{\'e} and Fatibello-Filho,
Orlando",
affiliation = "{Universidade Federal de Vi{\c{c}}osa (UFV)} and {Centro Federal
de Educa{\c{c}}{\~a}o Tecnol{\'o}gica de Minas Gerais (CEFET)}
and {Universidade Estadual de Campinas (UNICAMP)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal
de S{\~a}o Carlos (UFSCar)}",
title = "Amperometric flow injection analysis of hydroquinone in
dermatological creams using a porous diamond-like carbon
electrode",
journal = "Diamond and Related Materials",
year = "2023",
volume = "139",
pages = "e110367",
month = "Nov.",
keywords = "Carbon nanotube forest, Dermatologic samples, Diamond-like carbon,
Flow injection analysis, Hydroquinone.",
abstract = "A porous diamond-like carbon film deposited on vertically aligned
multi-walled carbon nanotubes (DLC:VAMWCNT) was evaluated as an
electrode material in flow injection analysis (FIA) with
amperometric detection. The redox behavior of hydroquinone (H2Q)
was carried out as proof of concept. From cyclic voltammetry
tests, H2Q gave a heterogeneous electron transfer rate constant
(k0) of 4.9 × 10\−3 cm s\−1, which is comparable or
better than those obtained with conventional electrodes. For the
H2Q determination with the FIA-amperometry system, optimizations
were performed regarding the supporting electrolyte, applied
potential and FIA parameters (flow rate and sample injection
volume). Under optimal conditions, the amperometric response of
the DLC:VAMWCNT electrode was linear in the H2Q concentration
range from 1.0 × 10\−6 to 1.0 × 10\−4 mol
L\−1, with a limit of detection (LOD) of 7.7 × 10\−7
mol L\−1. Interestingly, the DLC:VAMWCNT electrode
displayed a very stable response under hydrodynamic conditions,
with no memory effect while retaining accuracy towards the
analysis of commercial H2Q-based dermatological creams. From these
findings, DLC:VAMWCNT appears to be an outstanding candidate for
flow injection analysis systems coupled to electrochemical
detection.",
doi = "10.1016/j.diamond.2023.110367",
url = "http://dx.doi.org/10.1016/j.diamond.2023.110367",
issn = "0925-9635",
language = "en",
targetfile = "1-s2.0-S0925963523006921-main.pdf",
urlaccessdate = "02 maio 2024"
}