Abstract. The problems of realization of highly sensitive and precise conductometric biosensor systems are considered. Composition, structural schemes, software functions of multisensor analyzer of saccharides are described, general view is presented. Preliminary experimental research testifies that the system suggested allows separate determination of concentrations of saccharose, glucose, lactose and maltose with commercially necessary sensitivity. It can be a basis for development of modern analytical equipment for efficient concurrent measurement of concentrations of several saccharides in food industry.
The results of the study of the electric model of a two-electrode conductometric cell when measuring with alternating current are presented. The proposed model is based on the series connection of two impedances, which describe the near-electrode processes and processes in the volume of the test solution. It allows you to separately evaluate the informative and non-informative parameters of equivalent replacement schemes. The results of a theoretical study of the frequency properties of the near-electrode and volume impedances are presented. Based on them, simplifications of the equivalent cell impedance substitution scheme for the frequency-measuring subbands are proposed. The results of the study of the components of the cell impedance are given. A number of parameters have been determined that allow an experimental assessment of the legitimacy of the application of the electric cell model. Referenc es 30, figures 5.
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