Phospholipid-linked quinones-mediated electron transfer on an electrode modified with lipid bilayers

Suemori, Yoshiharu; Nagata, Morio; Kondo, Masaharu; Ishigure, Syuichi; Dewa, Takehisa; Ohtsuka, Toshiaki; Nango, Mamoru

doi:10.1016/j.colsurfb.2007.06.021

Cited by 8 publications

(8 citation statements)

References 31 publications

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“…Hong and Park prepared hydroquinone SAMs, and the β value was evaluated to be 1.04/CH 2 -unit [17]. Previously, we have reported electron transfer property of phospholipid-linked NQs in lipid bilayers deposited onto an electrode [18]. We found that the NQ-mediated electron transfer depends on pH as well as the diffusivity of NQ moiety in the membrane phase, where clear distance-dependent electron transfer could not be observed.…”

Section: Introductionmentioning

confidence: 97%

Electron transfer of quinone self-assembled monolayers on a gold electrode

Nagata

Kondo

Suemori

et al. 2008

Colloids and Surfaces B: Biointerfaces

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Section: Introductionmentioning

confidence: 97%

Electron transfer of quinone self-assembled monolayers on a gold electrode

Nagata

Kondo

Suemori

et al. 2008

Colloids and Surfaces B: Biointerfaces

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“…In order to clarify this point, several studies have been performed to understand PQ or UQ position and the characteristics of these molecules [10][11][12][13][14]. Previous voltammetric results of phospholipid layers containing quinone derivatives [13,[15][16][17][18][19] and the fact that UQ size and shape are close to those of PQ, make UQ a suitable candidate for substituting PQ, which isolation process has a huge cost, in studies of artificial photosynthesis. 3 Several studies have been performed on galactolipids due to their relevance in photosynthesis and other natural processes like cell growth modulator [20], anti-inflammatory [21,22] and anti-cancer agent [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Biomimetic monolayer films of monogalactosyldiacylglycerol incorporating ubiquinone

Hoyo

Torrent‐Burgués

Guaus

2012

Journal of Colloid and Interface Science

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Ubiquinone and plastoquinone are two of the main electron and proton shuttle molecules in biological systems, and monogalactosyldiacylglycerol (MGDG) is the most abundant lipid in the thylakoid membrane of chloroplasts. Saturated MGDG, ubiquinone-10 (UQ) and MGDG:UQ mixed monolayers at the air/water interface have been studied using Surface Pressure-Area isotherms and Brewster Angle Microscopy. Moreover, the transferred Langmuir-Blodgett films have been observed by Atomic Force Microscopy. The results show that MGDG:UQ mixtures present more fluid phase than pure MGDG indicating a higher order degree for the later. It is also observed an important influence of UQ on the MGDG matrix before UQ collapse pressure and a low influence after this event, due to UQ expulsion from the MGDG matrix. This expulsion leads to a similar remaining UQ content for all the tested mixtures, indicating a limiting content of this molecule in the MGDG matrix at high surface pressures. The thermodynamic studies confirm the stability of the MGDG:UQ mixtures at low surface pressures, although presenting a non-ideal behaviour. Results point to consider UQ as a good candidate for studies of artificial photosynthesis.

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“…Due to its high lipophilicity and well studied electrochemical behaviour in lipophilic environments in contact with water, UQ has been used to mediate electron, proton and ion transfer reactions on electrodes modified with biomimetic membranes (examples found in references [11,15,21]). The obtained results have provided with a clearer picture regarding the role of UQ in cell membranes.…”

Section: Introductionmentioning

confidence: 99%

Ubiquinone-10 in gold-immobilized lipid membrane structures acts as a sensor for acetylcholine and other tetraalkylammonium cations

Mårtensson

Hernández

2012

Bioelectrochemistry

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This is an accepted version of a paper published in Bioelectrochemistry. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the published paper: Mårtensson, C., Agmo Hernańdez, V. (2012 AbstractIt is reported that the reduction of ubiquinone incorporated into supported lipid bilayers and into immobilized liposome layers on gold electrodes is kinetically and thermodynamically enhanced by the presence of acetylcholine and tetrabutylammonium (TBA + ) in solution. The reduction peak and the mid-peak potentials of the redox reactions, determined by cyclic voltammetry, are displaced towards more positive potentials by approximately 500 and 250 mV, respectively, in the case of TBA + ; and by approximately 750 and 530 mV, respectively, in the case of acetylcholine. The intensity of the signal varies with the cation concentration, allowing for quantitative determinations in the millimolar range. It is proposed that the enhanced reduction of ubiquinone arises from the formation of tetraalkylammonium cationubiquinone radical anion ion-pairs. Electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) measurements confirmed that the potential shift and the intensity of the redox signal are coupled with the adsorption of the tetraalkylammonium cations on the lipid membrane. The Langmuir adsorption equilibrium constant (K) of TBA + on lipid membranes at physiological pH is determined. In supported lipid bilayers K = 440.7 ± 160 M -1 , while in an immobilized liposome layer K = 35.53 ± 3.53 M -1 . 1

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Phospholipid-linked quinones-mediated electron transfer on an electrode modified with lipid bilayers

Cited by 8 publications

References 31 publications

Electron transfer of quinone self-assembled monolayers on a gold electrode

Electron transfer of quinone self-assembled monolayers on a gold electrode

Biomimetic monolayer films of monogalactosyldiacylglycerol incorporating ubiquinone

Ubiquinone-10 in gold-immobilized lipid membrane structures acts as a sensor for acetylcholine and other tetraalkylammonium cations

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