Citation:
	            
		            Mohsen  Keyvanfard, Maryam  Tahmasbi, Hassan  Karimi-Maleh, Khadijeh  Alizad. A voltammetric sensor with a multiwall carbon nanotube paste electrode and naphthol green as a mediator for the determination of N-actylcysteine in the presence of tryptophan[J]. Chinese Journal of Catalysis,
							;2014, 35(4): 501-508.
						
							doi:
								10.1016/S1872-2067(14)60019-X
						
					
				
					
				
	        
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	                	A multiwall carbon nanotube modified electrode prepared by incorporating multiwall carbon nanotubes in the electrode of a sensor and naphthol green as a homogeneous mediator was used as a voltammetric sensor for the determination of N-actylcysteine (N-AC) in the presence of tryptophan (Trp). The voltammograms of differential pulse voltammetry of N-AC in a mixture with Trp were separated from each other by a potential difference of 200 mV, which allowed the determination of both N-AC and Trp simultaneously. Under the optimum conditions, the electrocatalytic currents increased linearly with N-AC concentration in the range of 0.25-400 μmol/L (two linear segments with different slopes). The detection limit for N-AC was 0.08 μmol/L. The kinetic parameters of the system were determined using electrochemical methods. The method was applied for the determination of N-AC in drug and urine samples.
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								Keywords:
								
 - N-actylcysteine,
 - Tryptophan,
 - Multiwall carbon nanotube,
 - Naphthol green,
 - Sensor
 
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