Aim. To develop enzyme conductometric biosensor for maltose determination. Methods. A conductometric transducer consisting of two gold pairs of electrodes was applied. Three-enzyme membrane (glucose oxidase, mutarotase, -glucosidase) immobilized on the surface of the conductometric transducer was used as a bioselective element. Results. A linear range of maltose conductometric biosensor was from 0,002 mM to 1 mM for glucose and maltose detection. The time of maltose analysis in solution was 1–2 minutes. The dependence of biosensor responses to substrate on pH, ionic strength, and buffer capacity of work solution was studied. The data of biosensor selectivity are presented. The developed conductometric biosensor is characterized by high operational stability and signal reproducibility. Conclusion. The enzyme conductometric biosensor for maltose determination has been developed. The analytical characteristics of the maltose biosensor were investigated. The proposed method could be used in food industry to control and optimize production.

Keywords: conductometric biosensor, maltose, mutarotase, glucose oxidase, -glucosidase.