A Sodium Selective Electrochemical Biosensor Based on the Sodium Pump

摘要

Na~+ is one of the most abundant metal ions and plays critical physiological roles in biological systems, therefore development of new Na~+ sensors is becoming increasingly important. Currently many physical and chemical methods have been applied to detect Na~+. In this paper, we developed a novel Na~+ electrode based on a biomaterial, light-driven Na~+ pump (NdR2). The photocurrent of the electrode upon excitation shows a characteristic positive polarity in Na~+ solution at neutral pH. The peak current shows Na~+ dependency within the concentration range from 1 to 200 mmol/L. The stability data show that the electrode is stable after being stored at 50℃ for 90 min. As a novel biosensor, this Na~+ pump-based electrode is of great significance in the study of ion transport mechanism and application of ion detection.