This study reports the isolation of four newβ-carboline alkaloids(1−4)and six previously identified alkaloids(5−10)from the roots of Peganum harmala L.Among these compounds,1 and 2 were characterized as rareβ-carbol...This study reports the isolation of four newβ-carboline alkaloids(1−4)and six previously identified alkaloids(5−10)from the roots of Peganum harmala L.Among these compounds,1 and 2 were characterized as rareβ-carboline-quinazoline dimers exhibiting axial chirality.Compound 3 possessed a unique 6/5/6/7 tetracyclic ring system with an azepine ring,and compound 4 was a novel annomontineβ-carboline.The structures of these compounds were elucidated by spectroscopic data and quantum mechanical calculations.The biosynthetic pathways of 1−3 were proposed.Additionally,the cytotoxicity of some isolates against four cancer cell lines(HL-60,A549,MDA-MB-231,and DU145)was evaluated.Notably,compound 4 exhibited significant cytotoxicity against HL-60,A549,and DU145 cells with IC_(50) values of 12.39,12.80,and 30.65μmol·L^(−1),respectively.Furthermore,compound 2 demonstrated selective cytotoxicity against HL-60 cells with an IC_(50) value of 17.32μmol·L^(−1).展开更多
Natural layered aluminosilicate Kaolinite Al 4[Si 4O 10 ](OH) 8 has been used as a starting material for preparing a new system of lithium fast ion conductors by high temperature(1073—1223 K) solid state react...Natural layered aluminosilicate Kaolinite Al 4[Si 4O 10 ](OH) 8 has been used as a starting material for preparing a new system of lithium fast ion conductors by high temperature(1073—1223 K) solid state reactions. X ray powder diffraction and a.c. impedance technique were used to characterize the compositions of the Li 1+2 x Al x Zr 2- x Si x P 3- x O 12 system. A single pure solid solution phase with R3c space group can be formed in the composition range of x ≤0 4. A specimen with x =0 3 possesses a maximum ionic conductivity which reaches up to 1 03×10 -2 s/cm at 723 K and the activation energy is 29 63 kJ/mol.展开更多
基金supported by the National Natural Science Foundation of China(No.81773604)the National Science and Technology Major Project of the Ministry of Science and Technology of China(No.2018ZX09735005)+1 种基金the Doctoral Scientific Research Fund Project of Nanyang Institute of Technology(No.510197)the Interdisciplinary Sciences Project,Nanyang Institute of Technology(No.520097).
文摘This study reports the isolation of four newβ-carboline alkaloids(1−4)and six previously identified alkaloids(5−10)from the roots of Peganum harmala L.Among these compounds,1 and 2 were characterized as rareβ-carboline-quinazoline dimers exhibiting axial chirality.Compound 3 possessed a unique 6/5/6/7 tetracyclic ring system with an azepine ring,and compound 4 was a novel annomontineβ-carboline.The structures of these compounds were elucidated by spectroscopic data and quantum mechanical calculations.The biosynthetic pathways of 1−3 were proposed.Additionally,the cytotoxicity of some isolates against four cancer cell lines(HL-60,A549,MDA-MB-231,and DU145)was evaluated.Notably,compound 4 exhibited significant cytotoxicity against HL-60,A549,and DU145 cells with IC_(50) values of 12.39,12.80,and 30.65μmol·L^(−1),respectively.Furthermore,compound 2 demonstrated selective cytotoxicity against HL-60 cells with an IC_(50) value of 17.32μmol·L^(−1).
文摘Natural layered aluminosilicate Kaolinite Al 4[Si 4O 10 ](OH) 8 has been used as a starting material for preparing a new system of lithium fast ion conductors by high temperature(1073—1223 K) solid state reactions. X ray powder diffraction and a.c. impedance technique were used to characterize the compositions of the Li 1+2 x Al x Zr 2- x Si x P 3- x O 12 system. A single pure solid solution phase with R3c space group can be formed in the composition range of x ≤0 4. A specimen with x =0 3 possesses a maximum ionic conductivity which reaches up to 1 03×10 -2 s/cm at 723 K and the activation energy is 29 63 kJ/mol.
