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Trans-membrane electron transfer in red blood cells immobilized in a chitosan film on a glassy carbon electrode

Research paper by Chunmei Yu, Li Wang, Zhenkun Zhu, Ning Bao, Haiying Gu

Indexed on: 17 Sep '13Published on: 17 Sep '13Published in: Microchimica Acta



Abstract

We have studied the trans-membrane electron transfer in human red blood cells (RBCs) immobilized in a chitosan film on a glassy carbon electrode (GCE). Electron transfer results from the presence of hemoglobin (Hb) in the RBCs. The electron transfer rate (ks) of Hb in RBCs is 0.42 s−1, and <1.13 s−1 for Hb directly immobilized in the chitosan film. Only Hb molecules in RBCs that are closest to the plasma membrane and the surface of the electrode can undergo electron transfer to the electrode. The immobilized RBCs displayed sensitive electrocatalytic response to oxygen and hydrogen peroxide. It is believed that this cellular biosensor is of potential significance in studies on the physiological status of RBCs based on observing their electron transfer on the modified electrode.The transmembrane electron transfer rate of Hb in RBCs is slower than hemoglobin molecules directly immobilized on the chitosan film. Only those hemoglobin in RBCs closest to the plasma membrane and electrode could exchange electrons with the electrode. The immobilized RBCs showed sensitive electrocatalytic response to O2 and H2O2.