Lipid bilayers are some of the most fascinating self-assembled structure in living nature. Not only do they serve as the protective boundary of cells and their internal organelles, they also organize and host major pa...Lipid bilayers are some of the most fascinating self-assembled structure in living nature. Not only do they serve as the protective boundary of cells and their internal organelles, they also organize and host major parts of the biochemical machinery for cellular communication and transmembrane transport. To study aspects of cellular membranes in a controlled manner, solid supported planar bilayers have served as reliable tools for many decades. They have been used in a large variety of studies ranging from fundamental investigations of membranes and their constituents to the dissection of cellular signaling mechanisms. However, there are limitations to these systems and recently a class of new systems in which the lipid bilayer is supported on a soft, polymer cushion has emerged. Here, we review the different polymer cushioned bilayer systems and discuss their manufacture and advantages.展开更多
A synthetic cationic surfactant, 5,5-ditetradecyl-2-(2-trimethyl-ammonioethyl)-1,3-dioxane bromide (DTDB), was used to construct a supported bilayer lipid membrane (s-BLM) coated on an underlying glassy carbon electro...A synthetic cationic surfactant, 5,5-ditetradecyl-2-(2-trimethyl-ammonioethyl)-1,3-dioxane bromide (DTDB), was used to construct a supported bilayer lipid membrane (s-BLM) coated on an underlying glassy carbon electrode (GCE). Electrochemical impedance spectroscopy (EIS), small-angle X-ray diffraction (SAXD) and cyclic voltammetry were used to characterize the s-BLM. Both EIS and SAXD data indicated that the synthetic lipid exists as a well-oriented bilayer in the membrane. The voltammetric study showed that the lipid membrane can open ion channels in the presence of C1O4- stimulant with Ru(bpy)32+ as marker ions and give distinct channel currents. The channels can be closed and open up again many times by removing or introducing ClO4- anions.展开更多
The supported bilayer lipid membrane(s-BLM) was served as a biomembrane model. The interaction between sodium cholate(NaC) and s-BLM was investigated by cyclic voltammetry and alternating current(AC) impedance spectro...The supported bilayer lipid membrane(s-BLM) was served as a biomembrane model. The interaction between sodium cholate(NaC) and s-BLM was investigated by cyclic voltammetry and alternating current(AC) impedance spectroscopy. The following conclusions were obtained: NaC can decrease the orderliness of lecithin molecule arrangement and induce pores or defects on s-BLM and the interaction between them depends on time, concentration and cholesterol. In addition, the defective s-BLM after interaction can be self-repaired in 0.1 mol/L KCl solution, which indicates that the interaction is reversible. Moreover, a possible mechanism of the interaction was proposed finally.展开更多
文摘Lipid bilayers are some of the most fascinating self-assembled structure in living nature. Not only do they serve as the protective boundary of cells and their internal organelles, they also organize and host major parts of the biochemical machinery for cellular communication and transmembrane transport. To study aspects of cellular membranes in a controlled manner, solid supported planar bilayers have served as reliable tools for many decades. They have been used in a large variety of studies ranging from fundamental investigations of membranes and their constituents to the dissection of cellular signaling mechanisms. However, there are limitations to these systems and recently a class of new systems in which the lipid bilayer is supported on a soft, polymer cushion has emerged. Here, we review the different polymer cushioned bilayer systems and discuss their manufacture and advantages.
基金Project supported by University of Science and Technology of China(Nos.ky1212 and ky2216).
文摘A synthetic cationic surfactant, 5,5-ditetradecyl-2-(2-trimethyl-ammonioethyl)-1,3-dioxane bromide (DTDB), was used to construct a supported bilayer lipid membrane (s-BLM) coated on an underlying glassy carbon electrode (GCE). Electrochemical impedance spectroscopy (EIS), small-angle X-ray diffraction (SAXD) and cyclic voltammetry were used to characterize the s-BLM. Both EIS and SAXD data indicated that the synthetic lipid exists as a well-oriented bilayer in the membrane. The voltammetric study showed that the lipid membrane can open ion channels in the presence of C1O4- stimulant with Ru(bpy)32+ as marker ions and give distinct channel currents. The channels can be closed and open up again many times by removing or introducing ClO4- anions.
文摘The supported bilayer lipid membrane(s-BLM) was served as a biomembrane model. The interaction between sodium cholate(NaC) and s-BLM was investigated by cyclic voltammetry and alternating current(AC) impedance spectroscopy. The following conclusions were obtained: NaC can decrease the orderliness of lecithin molecule arrangement and induce pores or defects on s-BLM and the interaction between them depends on time, concentration and cholesterol. In addition, the defective s-BLM after interaction can be self-repaired in 0.1 mol/L KCl solution, which indicates that the interaction is reversible. Moreover, a possible mechanism of the interaction was proposed finally.
