Two flavonol glycoside isomers of Icariside I and Caohuoside C were differentiated by electrospray ionization tandem mass spectrometry (ESI-MS^n) method. In the negative ion mode, the two compounds with different glyc...Two flavonol glycoside isomers of Icariside I and Caohuoside C were differentiated by electrospray ionization tandem mass spectrometry (ESI-MS^n) method. In the negative ion mode, the two compounds with different glycosyl moieties showed the same ESI-MS spectrum, but obvious different MS2 spectra and thus they can be distinguished rapidly, accurately and easily by ESI-MS.展开更多
A novel kind of alkaloid was isolated from the aerial of Epimedium koreanum Naki. The molecular weight and molecular formula were achieved by FT-ICRMS as 370 128 5012 and C 20H 20O 6N. The molecular structure of the c...A novel kind of alkaloid was isolated from the aerial of Epimedium koreanum Naki. The molecular weight and molecular formula were achieved by FT-ICRMS as 370 128 5012 and C 20H 20O 6N. The molecular structure of the compound C 20H 20O 6N was determined on the basis of spectral analyses as 6-hydroxy-11,12-dimethoxy-2,2-dimethyl-1,8-dioxo-1,3,4,8-tetrahydro-2H-7-oxa-2-azonia-benzo phenanthene. Using electrospray ionization multi-stage mass spectrometry, the structure was confirmed further. The compound was first reported from this kind of plant.展开更多
为了研究超高压提取山楂叶中黄酮类化合物的最佳工艺,采用超高压技术常温提取,正交试验优化,分光光度法检测山楂叶中黄酮类化合物的含量。结果表明:超高压提取山楂叶中黄酮类化合物的最佳提取工艺参数为:提取溶剂为50%乙醇,提取压力为40...为了研究超高压提取山楂叶中黄酮类化合物的最佳工艺,采用超高压技术常温提取,正交试验优化,分光光度法检测山楂叶中黄酮类化合物的含量。结果表明:超高压提取山楂叶中黄酮类化合物的最佳提取工艺参数为:提取溶剂为50%乙醇,提取压力为400 MPa,料液比为1∶45,提取温度为60℃,提取时间为3 m in。该超高压提取工艺具有提取效率高、时间短、杂质含量少等优点。展开更多
文摘Two flavonol glycoside isomers of Icariside I and Caohuoside C were differentiated by electrospray ionization tandem mass spectrometry (ESI-MS^n) method. In the negative ion mode, the two compounds with different glycosyl moieties showed the same ESI-MS spectrum, but obvious different MS2 spectra and thus they can be distinguished rapidly, accurately and easily by ESI-MS.
文摘A novel kind of alkaloid was isolated from the aerial of Epimedium koreanum Naki. The molecular weight and molecular formula were achieved by FT-ICRMS as 370 128 5012 and C 20H 20O 6N. The molecular structure of the compound C 20H 20O 6N was determined on the basis of spectral analyses as 6-hydroxy-11,12-dimethoxy-2,2-dimethyl-1,8-dioxo-1,3,4,8-tetrahydro-2H-7-oxa-2-azonia-benzo phenanthene. Using electrospray ionization multi-stage mass spectrometry, the structure was confirmed further. The compound was first reported from this kind of plant.
文摘为了研究超高压提取山楂叶中黄酮类化合物的最佳工艺,采用超高压技术常温提取,正交试验优化,分光光度法检测山楂叶中黄酮类化合物的含量。结果表明:超高压提取山楂叶中黄酮类化合物的最佳提取工艺参数为:提取溶剂为50%乙醇,提取压力为400 MPa,料液比为1∶45,提取温度为60℃,提取时间为3 m in。该超高压提取工艺具有提取效率高、时间短、杂质含量少等优点。
