Gold Electrodes Modified with Self-Assembled Layers Made of Sulphur Compounds and Gold Nanoparticles Used for Selective Electrocatalytic Oxidation of Catecholamine in the Presence of Interfering Ascorbic and Uric Acids

Table 1

Calibration curve parameters for determination of EP, AA and UA on modified gold electrodes. 𝑣=0.1 V s⁻¹.

Electrode	Compound	Regression equation	𝑅^2(𝑛)	Detection limit 𝑐𝐿/𝜇M
Au/DTDPA	EP	𝑗𝑝=(42±3)10^−3+(139±4)10^−5𝑐EP[𝜇𝑀]	0.9980 (𝑛=17)	0.045
	AA	𝑗𝑝=(175±6)10^−3+(630±4)10^−6𝑐AA[𝜇𝑀]	0.9981 (𝑛=10)	14
	UA	𝑗𝑝=(224±6)10^−3+(694±8)10^−6𝑐UA[𝜇𝑀]	0,9990 (𝑛=10)	12
Au/DTDPA/CA/Au-NPs	EP	𝑗𝑝=(60±6)10^−3+(167±3)10^−5𝑐EP[𝜇𝑀]	0.9975 (𝑛=17)	0.034
	AA	𝑗𝑝=(179±6)10^−3+(773±8)10^−6𝑐AA[𝜇𝑀]	0.9973 (𝑛=10)	9
	UA	𝑗𝑝=(180±4)10^−3+(1040±7)10^−6𝑐UA[𝜇𝑀]	0.9984 (𝑛=10)	8
Au/Au-NPs	EP	𝑗𝑝=(29±4)10^−3+(74±1)10^−5𝑐EP[𝜇𝑀]	0.9958 (𝑛=18)	0.069
	AA	𝑗𝑝=(32±1)10^−3+(476±3)10^−6𝑐AA[𝜇𝑀]	0.9997 (𝑛=10)	11
	UA	𝑗𝑝=(26±4)10^−3+(600±14)10^−6𝑐UA[𝜇𝑀]	0.9961 (𝑛=10)	8
Au/Au-NPs/DTDPA	EP	𝑗𝑝=(230±4)10^−3+(159±7)10^−5𝑐EP[𝜇𝑀]	0.9997 (𝑛=18)	0.035
	AA	𝑗𝑝=(56±2)10^−3+(1116±12)10^−6𝑐AA[𝜇𝑀]	0.9996 (𝑛=10)	7
	UA	𝑗𝑝=(147±5)10^−3+(1174±14)10^−6𝑐UA[𝜇𝑀]	0.9981 (𝑛=10)	5
Au/Au-NPs/DTDPA/CA/Au-NPs	EP	𝑗𝑝=(370±5)10^−3+(191±3)10^−5𝑐EP[𝜇𝑀]	0.9991 (𝑛=18)	0.03
	AA	𝑗𝑝=(82±5)10^−3+(1264±16)10^−6𝑐AA[𝜇𝑀]	0.9997 (𝑛=10)	7
	UA	𝑗𝑝=(176±4)10^−3+(1210±25)10^−6𝑐UA[𝜇𝑀]	0.9994 (𝑛=10)	4