Experimental evidence of the chaotic regime in a salicylate biosensor

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• 作者：Kubota ; Lauro T. ; Kleinke ; Mauricio U. ; Mello ; Cesar ; Bueno ; Maria I. ; de Oliveira Neto ; Graciliano
• 刊名：Chemical Physics Letters
• 出版年：1997
• 期刊代码：7_00092614
• 类别：ph
• 出版时间：January 24, 1997
• 卷：264
• 期：6
• 页码：662-666
• 文件大小：334 K

摘要

In a biosensor for salicylate, developed using a modified carbon paste electrode with silica gel coated with Meldola's Blue and salicylate hydroxylase, the current time series presented a complex oscillatory pattern, for salicylate and NADH concentrations close to 2.0 × 10⁻⁵ and 3.6 × 10⁻⁵ mol 1⁻¹, respectively. These experimental results suggest that the biosensor response presents chaotic characteristics. The complex temporal behavior of these series was diagnosed as deterministic chaos by measurement of the Grassberger-Procaccia dimension, and the calculation of the first Lyapunov exponent. The value determined for the correlation dimension is lower than 5. These results suggest a coupling of five or six differential equations to describe the redox reactions of the biosensor system.