Citation:
	            
		            Mohsen  Keyvanfard, Rasoul  Salmani-mobarakeh, Hassan  Karimi-Maleh, Khadijeh  Alizad. Application of 3,4-dihydroxycinnamic acid as a suitable mediator and multiwall carbon nanotubes as a sensor for the electrocatalytic determination of L-cysteine[J]. Chinese Journal of Catalysis,
							;2014, 35(7): 1166-1172.
						
							doi:
								10.1016/S1872-2067(14)60065-6
						
					
				
					
				
	        
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	                	A highly sensitive electrochemical sensor was prepared for the determination of L-cysteine using a modified multiwall carbon nanotubes paste electrode in the presence of 3,4-dihydroxycinnamic acid (3,4-DHCA) as a mediator, based on an electrocatalytic process. The results indicate that the electrode is electrocatalytically efficient for the oxidation of L-cysteine in the presence of 3,4-DHCA. The interaction between the mediator and L-cysteine can be used for its sensitive and selective determination. Using chronoamperometry, the catalytic reaction rate constant was calculated to be 2.37×102 mol-1 L s-1. The catalytic peak current was linearly dependent on the L-cysteine concentration in the range of 0.4-115 μmol/L. The detection limit obtained by linear sweep voltammetry was 0.25 μmol/L. Finally, the modified electrode was examined as a selective, simple, and precise new electrochemical sensor for the determination of L-cysteine in real samples.
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