الفهرس 
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Abstract
The present work, an electrochemical sensor based on
electrochemical reduced graphine oxide modified glassy carbon
electrode (GCE) was used for simultaneous determination of gallic
(GA) and protocatechuic (PA) acids. The prepared sensor shows a
significant enhancement in electro catalytic performance for the two
acids. A good resolution of their voltammetry peaks was obtained,
and a square wave voltammetr ic method was applied for the
simultaneous detection of GA and PA in their mixture. In the second
part of work, using ß -Cyclodextrin and Multi-Walled Carbon
nanotube with reduced graphene oxide (ß -CD/ MWCNTs/rGO )
illustrate a high and more sensitive electrode than rGO only. The
novel electrochemical sensor (ß -CD/ MWCNTs/rGO ) fabricated by
electropolymarization of ß - cyclodextrin on MWCNTs/rGO/GCE
modified electrode.The coated β-CD polymer had high electrical.