A Porous Perchlorate-Doped Polypyrrole Nanocoating on Nickel Nanotube Arrays for Stable Wide-Potential-Window Supercapacitors.

A bottom-up synthetic strategy is developed to fabricate a highly porous wave-superposed perchlorate-doped polypyrrole nanocoating on nickel nanotube arrays. The delicate nanostructure and the unique surface chemistry synergistically endow the obtained electrode with revealable pseudocapacitance, large operating potential window, and excellent cycling stability, which are highly promising for both asymmetric and symmetric supercapacitors.

[HPLC fingerprint of flavonoids and phenols of Dendrobium nobile].

OBJECTIVE: To establish HPLC fingerprint of flavonoids and phenols of Dendrobium nobile. METHODS: Phenomenex prodigy ODS(3) C18 column (250 mm x 4.6 mm, 5 microm) was used with a mixture of acetonitrile-0.1% acetic acid as the mobile phase in a gradient mode, the column temperature was 25 degrees C, the flow rate was 1.0 mL/min, and the detection wavelength was 254 nm. RESULTS: The flavonoids and phenols of Dendrobium nobile were well separated, and 10 fingerprint peaks in common were confirmed. CONCLUSION: This method is simple, accurate with good reproducibility, and can be used specifically for the quality control of Dendrobium nobile.

[Protective effects of extract of Ginkgo biloba on vascular endothelial dysfunction induced by AGEs-BSA in vivo].

OBJECTIVE: To explore the effect of extract of Ginkgo biloba (EGb) on vascular endothelial dysfunction induced by AGEs and to investigate the potential mechanisms. METHODS: Exogenous glycosylated bovine serum Albumin (AGEs-BSA) was prepared according to the methods of article. Vascular endothelial dysfunction was induced by tail vein injection of AGEs-BSA. The treatment group rats were given tail vein injections with AGEs-BSA followed by immediate intragastric of EGb (15,30 mg/kg/day, respectively) for 30 days. At the end of 30 days period, rats were anaesthetized with an intraperitoneal injection of sodium pentobarbital. Blood samples were collected from the carotid artery for biochemical assay of NO, MDA, SOD, DDAH, ADMA. The thoracic aorta was immediately isolated and cut into rings of 3 - 4 mm. Then ACh-induced EDR response and sodium SNP-induced endothelium-independent relaxation of aortic rings were examined. RESULTS: Results from in vivo experiments showed that the injection of AGEs-BSA significantly inhibited ACh-induced EDR response, but had no effect on SNP-induced endothelial-independent relaxation. The injection of AGEs-BSA decreased concentration of serum NO, activity of serum SOD and elevated serum MDA and ADMA level. Egb markedly attenuated AGEs-BSA induced inhibition of EDR response, increase of serum MDA and ADMA level, reduction of both NO level and activity of serum SOD.