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Sensors 2007, 7(10), 2446-2457; doi:10.3390/s7102446

Electrochemical Sensor for Tryptophan Determination Based on Copper-cobalt Hexacyanoferrate Film Modified Graphite Electrode

Department of Applied Chemistry, College of Sciences, South China Agricultural University, Guangzhou 510642, China
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Author to whom correspondence should be addressed.
Received: 3 July 2007 / Accepted: 15 October 2007 / Published: 19 October 2007
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Abstract

In this work, the development of a tryptophan sensor and its application to milkare described. The mixed metal (copper and cobalt) hexacynoferrates are electrodepositedon the graphite electrode, and this film exhibits an electrocatalytic activity towards for theoxidation of tryptophan. The experimental conditions, including the scan cycles, the ratio ofcopper(II) and cobalt(II), pH value, applied potential, are investigated in detail. At theoptimal conditions, the eletctrocatalytic response is a linear relationship with theconcentration of tryptophan in the range of 10 μM and 900 μM, with a detection limit ofabout 6 μM. This modified electrode was also successfully used to detect the tryptophanconcentration in milk. View Full-Text
Keywords: tryptophan; copper-cobalt hexacyanoferrate; electrocatalysis; sensor tryptophan; copper-cobalt hexacyanoferrate; electrocatalysis; sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Liu, Y.; Xu, L. Electrochemical Sensor for Tryptophan Determination Based on Copper-cobalt Hexacyanoferrate Film Modified Graphite Electrode. Sensors 2007, 7, 2446-2457.

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