Biomolecule-Free, Selective Detection of o-Diphenol and Its Derivatives with a Screen-Printed Electrochemical Sensor

We report here biomolecule-free, selective detection of o -diphenol and its derivatives with a screen-printed electrochemical sensor. It is based on the preparation of a highly stable slurry made of 2,2-diphenyl-1-picrylhydrazyl (DPPH) dissolved in 1-butyl-3-methylimidazolium hexafluorophosphate (BM...

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Bibliographic Details
Published inElectrocatalysis Vol. 9; no. 4; pp. 444 - 451
Main Authors Chen, Yu-Ju, Chang, Jen-Lin, Thiyagarajan, Natarajan, Zen, Jyh-Myng
Format Journal Article
LanguageEnglish
Published New York Springer US 01.07.2018
Springer Nature B.V
Subjects
Catalysis
Catechol
Chemical sensors
Chemistry
Chemistry and Materials Science
Derivatives
Diphenols
Electrochemistry
Electron microscopes
Energy Systems
Feasibility studies
Flow injection analysis
Fourier transforms
Gallic acid
Green tea
Hydroquinone
Ionic liquids
Ions
Original Research
Physical Chemistry
Selectivity
Sensors
Slurries
Screen-printing ink
Gallic acid
Electrochemical sensor
Diphenols
Imidazolium-based ionic liquid
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Summary:We report here biomolecule-free, selective detection of o -diphenol and its derivatives with a screen-printed electrochemical sensor. It is based on the preparation of a highly stable slurry made of 2,2-diphenyl-1-picrylhydrazyl (DPPH) dissolved in 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF 6 ) room temperature ionic liquid for use as screen-printed ink in fabricating the proposed sensor. A detailed investigation by scanning electron microscope (SEM) along with UV-visible and FT-IR spectroscopic studies indicates that DPPH is well dispersed and stabilized by BMIMPF 6 ionic liquid. Enhanced current response is observed using the as-printed electrode (designated as SP-DPILE) in electrochemical measurements of o -diphenols with good sensitivity and selectivity. Its selectivity is proved through the discrimination of catechol signal from resorcinol and hydroquinone in the absence of biomolecule auxiliary. This is valuable in real sample analysis, and the feasibility of the SP-DPILE is demonstrated for the detection of gallic acid in green tea by flow injection analysis. A highly stable slurry made of 2,2-diphenyl-1-picrylhydrazyl (DPPH) distributed within room temperature ionic liquid ([BMIM] [PF 6 ]) was developed for use as screen-printing ink in fabricating disposable sensors. Graphical Abstract
ISSN:1868-2529
1868-5994
DOI:10.1007/s12678-018-0460-8