| نویسندگان | محسن بهپور-سعید معصوم-مرضیه مشکی |
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| تاریخ انتشار | ۲۰۱۳-۹-۰۱ |
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| رتبه نشریه | علمی - پژوهشی |
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| نوع نشریه | الکترونیکی |
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| نمایه نشریه | ISC |
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چکیده مقاله
A graphene nanosheets (GNS) film coated glassy carbon electrode
(GCE) was fabricated for sensitive determination of tyrosine (Tyr).
The GNS-based sensor was characterized by scanning electron
microscope and electrochemical impedance spectroscopy. The
voltammetric techniques were employed to study electro-oxidation
of Tyr. The results revealed that the modified electrode showed an
electrocatalytic activity toward the anodic oxidation of Tyr by a
marked enhancement in the current intensity and the shift in the
oxidation potential to lower values (50 mV) in comparison with the
bare GCE. Some kinetic parameters such as the electron transfer
coefficient (α) were also determined for the Tyr oxidation. The
detection limit for Tyr was found to be 2.0×10-8 M (n=9), and the
peak current increases linearly with the Tyr concentration within
the molar concentration ranges of 5.0 ×10-6 to 1.2 ×10-4 M. The
modified electrode shows good sensitivity, selectivity and stability.
The prepared electrode was applied for the determination of Tyr in
real sample.