The chemical constituents from Aconitum richardsonianum var.pseudosessiliflorum were investigated.The roots of this plant were extracted three times with 90% EtOH at the room temperature.The ethanol extracts were comb...The chemical constituents from Aconitum richardsonianum var.pseudosessiliflorum were investigated.The roots of this plant were extracted three times with 90% EtOH at the room temperature.The ethanol extracts were combined and concentrated under reduced pressure to yield residue,which was suspended in water and successively partitioned with chloroform.The chloroform extraction was isolated and purified by silica gel and Sephadex LH-20 column chromatography.Six compounds were isolated and elucidated as delelatine（1）,isodelpheline（2）,3-acetylaconitine（3）,isoatisine（4）,nordhagenine A（5）and yunaconitine（6）.Compounds 1-5 were obtained from Aconitum Brunneum for the first time.Compound（1）showed significant cytotoxic activities（IC50=4.36 μM）against the human tumor cell line P388.展开更多
Tetraphenyl-porphyrin iron （FeTPP） was chosen to sensitize Cr doped TiO2 （Cr-TiO2） nanoparticles, a novel multimodified photocatalyst FeTPP-Cr-TiO2 with excellent visible- light photocatalytic activity was success...Tetraphenyl-porphyrin iron （FeTPP） was chosen to sensitize Cr doped TiO2 （Cr-TiO2） nanoparticles, a novel multimodified photocatalyst FeTPP-Cr-TiO2 with excellent visible- light photocatalytic activity was successfully synthesized. The FeTPP-Cr-TiO2 microspheres were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electronic microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectra and N2 adsorption-desorption isotherms. The photocatalytic activity of FeTPP-Cr-TiO2 was evaluated by degradations of methylene blue in aqueous solution under irradiation with Xe lamp （150 W）. The results showed that the FeTPP-Cr-TiO2 multimodified photocatalyst was anatase phase with high specific surface area （74.7 m^2/g）, and exhibited higher photocatalytic degradation efficiency than Cr-TiO2 and FeTPP-TiO2. The photocatalytic degradations of three quinolone antibiotics （lomefioxacin, norfioxacin, and ofioxacin） were further estimated for the feasibility of practical application of catalyst in wastewater treatment. It is desirable that photodegradation of antibiotics with FeTPP-Cr-TiO2 achieved pretty high degradation rates and all followed the pseudo first-order reaction model, and the rate constants k of 3.02×10^-2, 2.81×10^-2, and 3.86×10^-2 min-1 and the half-lifes t1/2 of 22.9, 24.6, and 17.9 min were achieved respectively.展开更多
基金financially supported by the Scientific Research Program Funded by Shaanxi Provincial Department(2010JK74909JK672)+1 种基金by the Special Research Fund for the Doctoral Program of Higher Education(20096118110008)the Natural Science Foundation of Shaanxi Province(SJ08B16)
文摘The chemical constituents from Aconitum richardsonianum var.pseudosessiliflorum were investigated.The roots of this plant were extracted three times with 90% EtOH at the room temperature.The ethanol extracts were combined and concentrated under reduced pressure to yield residue,which was suspended in water and successively partitioned with chloroform.The chloroform extraction was isolated and purified by silica gel and Sephadex LH-20 column chromatography.Six compounds were isolated and elucidated as delelatine（1）,isodelpheline（2）,3-acetylaconitine（3）,isoatisine（4）,nordhagenine A（5）and yunaconitine（6）.Compounds 1-5 were obtained from Aconitum Brunneum for the first time.Compound（1）showed significant cytotoxic activities（IC50=4.36 μM）against the human tumor cell line P388.
文摘Tetraphenyl-porphyrin iron （FeTPP） was chosen to sensitize Cr doped TiO2 （Cr-TiO2） nanoparticles, a novel multimodified photocatalyst FeTPP-Cr-TiO2 with excellent visible- light photocatalytic activity was successfully synthesized. The FeTPP-Cr-TiO2 microspheres were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electronic microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectra and N2 adsorption-desorption isotherms. The photocatalytic activity of FeTPP-Cr-TiO2 was evaluated by degradations of methylene blue in aqueous solution under irradiation with Xe lamp （150 W）. The results showed that the FeTPP-Cr-TiO2 multimodified photocatalyst was anatase phase with high specific surface area （74.7 m^2/g）, and exhibited higher photocatalytic degradation efficiency than Cr-TiO2 and FeTPP-TiO2. The photocatalytic degradations of three quinolone antibiotics （lomefioxacin, norfioxacin, and ofioxacin） were further estimated for the feasibility of practical application of catalyst in wastewater treatment. It is desirable that photodegradation of antibiotics with FeTPP-Cr-TiO2 achieved pretty high degradation rates and all followed the pseudo first-order reaction model, and the rate constants k of 3.02×10^-2, 2.81×10^-2, and 3.86×10^-2 min-1 and the half-lifes t1/2 of 22.9, 24.6, and 17.9 min were achieved respectively.
