Bulg. J. Phys. vol.28 no.1-2 (2001), pp. 76-84

Formation of Glassy Carbon Supported Thin Liquid Films of Lecithin. Reaction to Electroactive Species in Solution

M. Karabaliev1, V. Kochev2
1Dept. of Physics and Biophysics, Faculty of Medicine, Trakia University, 11 Armeiska, Stara Zagora 6003, Bulgaria
2Department of Atomic Physics, Faculty of Physics, Sofia University St. Kl. Ohridski, 5 J. Bourchier Blvd, 1164 Sofia, Bulgaria
Abstract. A preparation of stable thin liquid films of lecithin on a highly polished glassy carbon support is reported. The electrical parameters of thus modified flat surface are voltammetrically studied. The evaluation of the organic phase thickness shows that under certain conditions a very compact monolayer of lipid molecules is obtained during the process of film thinning. The results from voltammetry suggest that such a solid supported lipid layer represents a barrier for the transport of charges between the electrolyte phase and the electrode which is of interest for the biosensor construction.

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