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Incorporation of ubiquinone in supported lipid bilayers on ITO

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10.1021/jp4004517
 
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hdl:2117/20027

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Hoyo Pérez, JavierMés informacióMés informació
Guaus Guerrero, EsterMés informacióMés informacióMés informació
Oncins, Gerard
Torrent Burgués, JuanMés informacióMés informacióMés informació
Sanz Carrasco, Fausto
Document typeArticle
Defense date2013-05-31
Rights accessRestricted access - publisher's policy
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Ubiquinone (UQ) is one of the main electron and proton shuttle molecules in biological systems, and dipalmitoylphosphatidylcholine (DPPC) is one of the most used model lipids. Supported planar bilayers (SPBs) are extensively accepted as biological model membranes. In this study, SPBs have been deposited on ITO, which is a semiconductor with good electrical and optical features. Speci fi cally, topographic atomic force microscopy (AFM) images and force curves have been performed on SPBs with several DPPC:UQ ratios to study the location and the interaction of UQ in the SPB. Additionally, cyclic voltammetry has been used to understand the electrochemical behavior of DPPC:UQ SPBs. Obtained results show that, in our case, UQ is placed in two main di ff erent positions in SPBs. First, between the DPPC hydrophobic chains, fact that originates a decrease in the breakthrough force of the bilayer, and the second between the two lea fl ets that form the SPBs. This second position occurs when increasing the UQ content, fact that eventually forms UQ aggregates at high concentrations. The formation of aggregates produces an expansion of the SPB average height and a bimodal distribution of the breakthrough force. The voltammetric response of UQ depends on its position on the bilayer
CitationHoyo, J. [et al.]. Incorporation of ubiquinone in supported lipid bilayers on ITO. "Journal of physical chemistry B", 31 Maig 2013, vol. 117, núm. 25, p. 7498-7506. 
URIhttp://hdl.handle.net/2117/20027
DOI10.1021/jp4004517
ISSN1520-6106
Publisher versionhttp://pubs.acs.org/doi/abs/10.1021/jp4004517
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