Electrochemistry of didodecyldimethylammonium (DDAB) films containing cobalt phthalocyanine tetrasulfonate (CoPcTS4-) was examined. CoPcTS4--DDAB film electrode showed stable cyclic voltammetric responses in buffers a...Electrochemistry of didodecyldimethylammonium (DDAB) films containing cobalt phthalocyanine tetrasulfonate (CoPcTS4-) was examined. CoPcTS4--DDAB film electrode showed stable cyclic voltammetric responses in buffers and could catalyze reductions of trichloroacetic acid.展开更多
The vesicle of didodecyldimethylammonium bromide (DDAB) which containedtetrathiafulvalene (TTF) was mixed with xanthine oxidase, and the mixture was cast on the pyrolyticgraphite electrode. The lipid films were used t...The vesicle of didodecyldimethylammonium bromide (DDAB) which containedtetrathiafulvalene (TTF) was mixed with xanthine oxidase, and the mixture was cast on the pyrolyticgraphite electrode. The lipid films were used to supply a biological environment resemblingbiomembrane on the surface of the electrode. TTF was used as a mediator because of its highelectron-transfer efficiency. A novel xanthine biosensor based on cast DDAB film was developed. Theeffects of pH and operating potential were explored for optimum analytical performance by using theamperometric method. The response time of the biosensor was less than 10 s. The detection limit ofthe biosensor was 3.2 x 10^(-7) mol/L and the liner range was from 4 x 10^(-7) mol/L to 2.4 x10^(-6) mol/L.展开更多
Ordered films were made by casting a mixture of aqueous dispersions of didodecyldimethylammonium bromide (DDAB)-clay composite and myoglobin (Mb) solution on pyrolytic graphite (PG) electrodes. The Mb-DDAB-clay film e...Ordered films were made by casting a mixture of aqueous dispersions of didodecyldimethylammonium bromide (DDAB)-clay composite and myoglobin (Mb) solution on pyrolytic graphite (PG) electrodes. The Mb-DDAB-clay film electrodes showed stable and reversible cyclic voltammetric responses in buffers and can catalyze the reduction of id (TCA).展开更多
The vesicle structures of egg yolks phosphatidylcholine/didodecyldimethylammonium bromide （1 ： 1, mass ratio） deposited on mica were studied by atomic force microscopy （AFM） both in aqueous phase and air. In aque...The vesicle structures of egg yolks phosphatidylcholine/didodecyldimethylammonium bromide （1 ： 1, mass ratio） deposited on mica were studied by atomic force microscopy （AFM） both in aqueous phase and air. In aqueous phase both bilayer and domelike vesicles with a mean diameter of 45 nm were observed, whereas in air the structure was more complicated depending on the initial concentration of vesicles. Vesicles with the original size could only be visualized at very low concentration with a mean diameter of 55 nm, which is a little larger than the result obtained in aqueous phase. At higher concentrations, fused large aggregates and multiple bilayer with a thickness ca. 4 nm of each bilayer were dominated. A plausible adsorption mechanism was proposed based on the experimental results.展开更多
文摘Electrochemistry of didodecyldimethylammonium (DDAB) films containing cobalt phthalocyanine tetrasulfonate (CoPcTS4-) was examined. CoPcTS4--DDAB film electrode showed stable cyclic voltammetric responses in buffers and could catalyze reductions of trichloroacetic acid.
文摘The vesicle of didodecyldimethylammonium bromide (DDAB) which containedtetrathiafulvalene (TTF) was mixed with xanthine oxidase, and the mixture was cast on the pyrolyticgraphite electrode. The lipid films were used to supply a biological environment resemblingbiomembrane on the surface of the electrode. TTF was used as a mediator because of its highelectron-transfer efficiency. A novel xanthine biosensor based on cast DDAB film was developed. Theeffects of pH and operating potential were explored for optimum analytical performance by using theamperometric method. The response time of the biosensor was less than 10 s. The detection limit ofthe biosensor was 3.2 x 10^(-7) mol/L and the liner range was from 4 x 10^(-7) mol/L to 2.4 x10^(-6) mol/L.
文摘Ordered films were made by casting a mixture of aqueous dispersions of didodecyldimethylammonium bromide (DDAB)-clay composite and myoglobin (Mb) solution on pyrolytic graphite (PG) electrodes. The Mb-DDAB-clay film electrodes showed stable and reversible cyclic voltammetric responses in buffers and can catalyze the reduction of id (TCA).
基金Project supported by the National Natural Science Foundation of China （No. 20573079）, The authors are grateful to Prof. Daiwen PANG and Dr. Zhexue LU of Department of Chemistry of Wuhan University, Wuhan, for their kindly help in the AFM measurements.
文摘The vesicle structures of egg yolks phosphatidylcholine/didodecyldimethylammonium bromide （1 ： 1, mass ratio） deposited on mica were studied by atomic force microscopy （AFM） both in aqueous phase and air. In aqueous phase both bilayer and domelike vesicles with a mean diameter of 45 nm were observed, whereas in air the structure was more complicated depending on the initial concentration of vesicles. Vesicles with the original size could only be visualized at very low concentration with a mean diameter of 55 nm, which is a little larger than the result obtained in aqueous phase. At higher concentrations, fused large aggregates and multiple bilayer with a thickness ca. 4 nm of each bilayer were dominated. A plausible adsorption mechanism was proposed based on the experimental results.
