Abstract
Black lipid membranes (BLMs) are significant in studies of membrane transport, incorporated proteins/ion transporters, and hence in construction of biosensor devices. Although BLMs provide an accepted mimic of cellular membranes, they are inherently fragile. Techniques are developed to stabilize them, such as hydrogel supports. In this paper, we present a reusable device for studies on hydrogel supported (hs) BLMs. These are formed across an ethylene tetrafluoroethylene (ETFE) aperture array supported by the hydrogel, which is during in situ polymerization covalently “sandwiched” between the ETFE substrate and a gold electrode microchip, thus allowing direct electrochemical studies with the integrated working electrodes. Using electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy and contact angle measurements, we demonstrate the optimized chemical modifications of the gold electrode microchips and plasma modification of the ETFE aperture arrays facilitating covalent “sandwiching” of the hydrogel. Both fluorescence microscopy and EIS were used to demonstrate the induced spontaneous thinning of a deposited lipid solution, leading to formation of stabilized hsBLMs on average in 10 min. The determined specific membrane capacitance and resistance were shown to vary in the range 0.31–0.49 μF/cm2 and 45–65 kΩ cm2, respectively, corresponding to partially solvent containing BLMs with an average life time of 60–80 min. The characterized hsBLM formation and devised equivalent circuit models lead to a schematic model to illustrate lipid molecule distribution in hydrogel-supported apertures. The functionality of stabilized hsBLMs and detection sensitivity of the platform were verified by monitoring the effect of the ion transporter valinomycin.
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Acknowledgments
This work was financially supported by the Copenhagen Research School of Nanotechnology (CONT) from Denmark, Department of Micro- and Nanotechnology at Technical University of Denmark and a cleantech company Aquaporin A/S in Copenhagen, Denmark. Additionally, A. H. acknowledges Lundbeck Foundation grant no. R69-A6408 for financial support.
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Agnieszka Mech-Dorosz and Arto Heiskanen contributed equally to this work.
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Mech-Dorosz, A., Heiskanen, A., Bäckström, S. et al. A reusable device for electrochemical applications of hydrogel supported black lipid membranes. Biomed Microdevices 17, 21 (2015). https://doi.org/10.1007/s10544-015-9936-y
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DOI: https://doi.org/10.1007/s10544-015-9936-y