Abstract
This work outlines a simple fabricated microneedle electrode for sensitive and real sample monitoring of plant polyphenolics. The electrode was fabricated by layer-by-layer assembly (LBL) with nanocomposite of carbon nanotubes (CNT) and cellulose nanocrystals (CNC) as the first layer, followed by polyaniline (PANI), and finally, the 3-(glycidyloxypropyl)trimethoxysilane (GOPS) layer as the binding agent. The microneedle electrodes were characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), Fourier transform infrared (FTIR) spectroscopy, and Raman spectroscopy. The developed microneedle electrodes were successfully applied for the capacitive detection of gallic acid (GA) and chlorogenic acid (CA) as polyphenol model compounds. The microneedle electrode was also used to quantify polyphenols in orange juice. The electrochemical capacitance responses were linearly proportional to the concentrations of GA and CA in the range of 0.1–87.23 μg/mL for GA and 0.1–78.01 μg/mL for CA. The calculated detection limits (LOD) for GA and CA were found to be 0.29 ± 0.2 μg/mL and 0.34 ± 0.2 μg/mL respectively. As minimally invasive technology, microneedle electrodes were found to be promising for successful in situ screening of antioxidants in different fruit matrices. The microneedle electrodes were also applied to the depth profiling of antioxidant content in fruit samples.
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Abbreviations
- APS:
-
Ammonium peroxydisulfate
- Amp:
-
Amperometry
- AuMCs:
-
Gold microclusters
- CA:
-
Chlorogenic acid
- CNT:
-
Carbon nanotubes
- CNC:
-
Cellulose nanocrystals
- CCE:
-
Carbon ceramic electrode
- CS:
-
Chitosan
- ChCl:
-
Chlorine chloride
- CPE:
-
Carbon paste electrode
- COF:
-
Covalent organic framework
- CV:
-
Cyclic voltammetry
- DPV:
-
Differential pulse voltammetry
- Delph:
-
Delphinidin
- DMC:
-
Defective mesoporous carbon
- DMTP:
-
2,5-Dimethoxyterephaldehyde
- EIS:
-
Electrochemical impedance spectroscopy
- ERGO:
-
Electrochemically reduced graphene oxide
- FIA:
-
Flow injection amperometry
- fFe2O3 :
-
Fishbone-shaped Fe2O3
- FTO:
-
Flourine doped tin oxide
- GOPS:
-
3-(Glycidyloxypropyl)trimethoxysilane
- GA:
-
Gallic acid
- GCE:
-
Glassy carbon electrode
- IL:
-
Ionic liquid
- LBL:
-
layer by layer
- LOD:
-
Limit of detection
- MIP:
-
Molecularly imprinted polymer
- MIL-100(Fe):
-
Metal organic framework
- MIS:
-
Molecularly imprinted siloxane
- MPC:
-
Macroporous carbon
- MWCNT:
-
Multiwalled carbon nanotubes
- NPs:
-
Nanoparticles
- PANI:
-
Polyaniline
- PME:
-
Polymelamine electrode
- PmPD:
-
Poly(m-phenylenediamine)
- PAL:
-
Palygorskite
- PEP:
-
Polyepinephrine
- PEG:
-
Pencil graphite electrode
- PDDA:
-
Poly(diallyldimethylammonium chloride)
- POM:
-
Polyoxometalates
- rGO:
-
Reduced graphene oxide
- SF:
-
Sulfonate
- SPCE:
-
Screen-printed carbon electrode
- SEM:
-
Scanning electron microscopy
- SWV:
-
Square wave voltammetry
- TABP:
-
1,3,5-Tris(4-aminophenyl)benzene
- TNrGO:
-
Titanium nitride doped graphene oxide
- TPM:
-
3-(Trimethoxysilyl)propyl methacrylate
- VTMS:
-
Vinyltrimethoxysilane
- WCrGO:
-
Wolfram carbide doped graphene oxide
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Acknowledgments
Mugo research group acknowledges funding from the Natural Sciences and Engineering Research Council of Canada (NSERC) and MacEwan University Research.
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Dhanjai, Mugo, S.M. & Lu, W. Modified stainless steel microneedle electrode for polyphenolics detection. Anal Bioanal Chem 412, 7063–7072 (2020). https://doi.org/10.1007/s00216-020-02836-w
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DOI: https://doi.org/10.1007/s00216-020-02836-w