A Biosensor for the Determination of β-galactosidase Activity: A Different Viewpoint on Biosensors

Abstract

Abstract: β-galactosidase splits lactose into glucose and galactose. Because of its biotechnological interest, we presented a biosensor system in order to monitor β-galactosidase activity. Immobilization steps of the biosensor were identified by cyclic voltammograms and electrochemical impedance spectroscopy. β-galactosidase was voltammetrically detected at about +150 mV (vs. Ag/AgCl) in citrate buffer solution (0.05 M, pH 4.8). The linear response for β-galactosidase detection was in the range of 0.0118 U mL⁻¹to 0.47 U mL⁻¹and a shorter response time of ∼50 s. Our results demonstrated the biosensor's electrochemical properties and analytical characteristics were very useful and effective for monitoring of β-galactosidase activity.

Keywords::

• β-galactosidase
• glucose oxidase
• biosensor
• enzyme activity
• electropolymerization

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.