Electrodes modified with cast lipid films: the effects of lipid composition on the electrochemistry of incorporated amphiphilic viologens

Manganese Porphyrin-Mediated Electron Transfer across a Liposomal Membrane and on an Electrode Modified with a Lipid Bilayer Membrane

“…As is apparent from Figure , a sharp break point in the current− temperature behavior is likely to reflect the melting of the multilayer assembly, in which the sharp break points for DMPC, DPPC, and DSPC were observed at 32, 42, and 52 °C, respectively. That is, the gel-to-fluid phase transition can be observed. − These characteristic temperatures correspond to a transient from a gel form to a fluid form of DMPC, DPPC, and DSPC bilayers. 1g,3c,− ,− The free movement and diffusion of Mn porphyrin derivatives may be a crucial factor for the electron transfer from the carbon electrode for Mn(III)/Mn(II) reduction or between Mn(III) and Mn(II) in manganese porphyrins. Similar results were observed for the cyclic voltammetric response of a GC electrode covered with DMPC, DPPC, and DSPC membranes containing other manganese porphyrins (data not shown).…”

“…In our previous papers, we synthesized and characterized polymer-linked halogenated tetraphenylporphyrin derivatives and covalently linked porphyrin dimers, in which transmembrane electron transfer between porphyrins catalyzed by manganese porphyrins was observed, depending on the structure of the porphyrin derivative. 1f,,3a,b,d Moreover, transmembrane electron transfer catalyzed by phospholipid-linked manganese tetraphenylporphyrin derivatives with separated methylene groups (PE-C n -MnTTP and PE-C n -MnPFPP) ( n = 0, 5, 11) (Chart ) which can be easily immersed into the lipid bilayer is reported. 1c,3c The phospholipid-linked manganese porphyrins caused an enhanced electron transfer, depending upon the length of the spacer methylene group (C n ) and also the structure of manganese porphyrins. Alternatively, a large number of chemists have identified that electroactive species such as porphyrins, myoglobin, flavins, viologens, ferrocenes, and quinones can be immobilized on electrode surfaces. 1g,− However, there has been little study of electron transfer between porphyrin complexes on an electrode modified with lipid bilayers 1g. In the previous paper, 1g, enhanced electron transfer between porphyrins in polypeptide membranes cast on a galssy carbon electrode or in those membranes was observed especially in hydrophilic polypeptide membranes and also when mesoporphyrin derivatives were used.…”

Electron Transfer and Adsorption of Myoglobin on Self-Assembled Surfactant Films: An Electrochemical Tapping-Mode AFM Study

“…More recently, membranes of surfactants − and natural lipids − have been used to coat electrodes by self-assembly or Langmuir−Blodgett methods. Because these systems mimic the physiological environment of many membrane-associated proteins, they provide not only an effective way to immobilize proteins onto electrodes for biosensor applications but also nice model systems for studying the biological functions of these proteins.…”

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

“…Groves et al reported vectorial electron transfer of metalloporphyrins in a lipid membrane [20]. Rojas et al reported that electron transfer of amphiphilc viologens on a glassy carbon electrode modified with phospholipids was diffusion controlled [21]. Tominaga et al reported direct electron transfer of ferredoxin in lipid bilayers on an electrode [22].…”