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Page 82
Volume 4
December 10-12, 2018
Rome, Italy
Nano Research & Applications
ISSN: 2471-9838
Advanced Materials 2018
Nano Engineering 2018
JOINT EVENT
22
nd
International Conference on
Advanced Materials
and Simulation
&
22
nd
Edition of International Conference on
Nano Engineering &
Technology
T
he human health is highly affected by the usage of synthetic
dyes in foods and drinks. The dyes are generally added
to improve the appearance, color and taste of food but if the
intake exceeds a certain amount, it may be pathogenic. Sunset
Yellow (SY) belongs to the azo-dye family and contains an azo
functional group (N=N) and aromatic rings, which may be harmful
to human health. Since it is less expensive and more stable
than natural dyes, SY is frequently used in food products (e.g.,
orange juice). According to the World Health Organization, the
accepted daily intake value for sunset yellow is 0–4
mg.kg−1 and
its concentration in non-alcoholic beverages should not exceed
50 mg.L−1. Its detection by electrochemical technique using
graphene modified electrodes may be a viable alternative to the
more laborious HPLC method. Graphene-based materials were
prepared by exfoliation of graphite rod via pulses of current in
solutions containing various electrolytes e.g., ammonium sulfate;
amixture of boric acid and sodiumchloride; and amixture of nitric
and sulfuric acid. The samples were correspondingly denoted
Gr-AS, Gr-BA and Gr-NS. After washing and lyophilization, the
samples were morphologically and structurally characterized
by transmission/scanning electron microscopy, X-ray powder
diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and
Raman spectroscopy. According to XRD spectra, the Gr-AS and
Gr-BA samples (prepared in the first two electrolytes) contain
few-layer and multi-layer graphene flakes. In contrast, the Gr-NS
sample prepared in the third electrolyte contains not only few and
multi-layer graphene flakes but also a large amount of graphene-
oxide (̴39%). The performances of glassy carbon (GC) electrodes
modified with the graphene based materials were tested toward
sunset yellow (SY) detection and compared with those of bare
GC. As expected, the graphene modified electrodes have higher
sensitivities, wider linear ranges and lower detection limits.
xyz@uasd.xyzPruneanu S, Pogacean F, Magerusan L, Coros M, Rosu M C, Gergely S
and
Mirel V
National Institute for Research and Development of Isotopic and Molecular Technologies, Romania
Nano Res Appl 2018, Volume 4
DOI: 10.21767/2471-9838-C7-028
Electrochemical detection of sunset yellow
using graphene modified electrodes