Electrochemical Behaviour of the Interaction Between Chitosan and Alizarin

Abstract

Abstract: The interaction between Alizarin red(AR) and Chitosan(CS) was investigated in (0.1 mol/L) HAc-NaAc buffer solution(pH=4.5) on the glassy carbon electrode(GC) by cyclic and square wave voltammetry. The results show that both AR and AR-CS complex have a well-defined quasi-reversible redox wave(V_pc=-0.46 V, V_pa=-0.41 V) with adsorption characteristics. Electron transfer coefficient(α) and reaction rate constant(K_s) of AR and AR-CS were measured by cyclic voltammetry. The maximum binding numbers m between AR and CS was found to be 2 500. The experiment results confirmed that lower concentration of CS can enhance the detection sensitivity, while higher concentration of CS can lower the detection sensitivity. In the presence of 2.0×10^-5 mol/L AR, the peak current of system are proportional to CS concentration in the range of 1.25×10^-8～2.5×10^-7 mol/L, and inversely proportional to CS concentration in the range of 2.5×10^-7～1.25×10^-5 mol/L, respectively. The binding interaction mechanism was also discussed.

Key words: Chitosan, Alizarin red, Interaction, Electrochemical behavior

CLC Number:

O657.14

TrendMD:

TAN Xue-Cai, MAI Zhi-Bin, ZOU Xiao-Yong, QIU Jun-Ming, CAI Pei-Xiang. Electrochemical Behaviour of the Interaction Between Chitosan and Alizarin[J]. Chem. J. Chinese Universities, 2005, 26(6): 1055.

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Electrochemical Behaviour of the Interaction Between Chitosan and Alizarin

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