Two new C21 steroids were isolated from the CHCl3 extract of the stem of Marsdenia tenacissima. On the basis of spectroscopic analysis and chemical methods, their structures were elucidated as 17β-tenacigenin B (2)...Two new C21 steroids were isolated from the CHCl3 extract of the stem of Marsdenia tenacissima. On the basis of spectroscopic analysis and chemical methods, their structures were elucidated as 17β-tenacigenin B (2) and 3-O-6-deoxy-3-O-methyl-β-D-allopyranosyl-(1→4)-β-D- oleandropyranosyl-tenacigenin C (3). The structure of the known aglycon tenacigenin C was revised as 5α, 9α, 17β-pregnane-3β, 8β, 11α, 12β, 14β-pentanol-20-one. Compound 3 is the first reported glycoside of tenacigenin C.展开更多
From the stems ofMarsdenia tenacissima two new polyoxypregnanes were isolated, their structures were elucidated by 1D, 2D-NMR as 11α,12β-di-O-tigloyl-tenacigenin B （1） and tenacigenoside E （2）.
A new C21 steroid glycoside,11α-O-tigloyl-12-β-O-acetyl tenacigenin B 3-O-β-D-glucopyranosyl-（1→4）-β-D-glucopyr- anosyl-（1→4）-3-O-methyl-6-deoxy-β-D-allopyranosyl-（1→4）-β-D-oleandropyranoside（1）,named...A new C21 steroid glycoside,11α-O-tigloyl-12-β-O-acetyl tenacigenin B 3-O-β-D-glucopyranosyl-（1→4）-β-D-glucopyr- anosyl-（1→4）-3-O-methyl-6-deoxy-β-D-allopyranosyl-（1→4）-β-D-oleandropyranoside（1）,named tenacissoside N was isolated from the stems of Marsdenia tenacissima.The structure of the glycoside was identified by HR-ESI-MS and NMR spectra.展开更多
To establish an assessment of floristic and edaphic characteristics of steppe formations we conducted a phytoecological study on a local scale by comparing the current plant diversity and soil in three (3) stations re...To establish an assessment of floristic and edaphic characteristics of steppe formations we conducted a phytoecological study on a local scale by comparing the current plant diversity and soil in three (3) stations representative of the vegetation to alfa (Stipa tenacissima L.) located south of Saida (western Algeria). The relations between the station, the vegetation and the characteristics of soils in the steppe are very imperfectly known. This study intends to analyze the relationship between floristic composition and edaphic parameters of the steppe at alfa. Anthropogenic pressures on plant structure are different imbalance resulting in one ecological. The floristic and edaphic data have been the subject of a factorial correspondence analysis (A.F.C). The floristic inventory denotes a regressive dynamics of the formations at alfa passing from one site to another. Thus 39 plant species have been inventoried in the site in good condition, against 26 species for the moderately degraded site and 16 species only for the damaged site. The coupled results between species and edaphic parameters show the relations between the plant diversity and the physico-chemical characteristics of the soils. The statistical analyses do appear a strong correlation between floristic composition, the state of vegetation and the edaphic parameters.展开更多
目的研究通关藤Marsdenia tenacissima(Roxb.)Wight et Arn.的化学成分及其细胞毒活性。方法通关藤水提取物采用大孔树脂、硅胶、ODS、制备HPLC进行分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。采用MTT法评价其对肿瘤细胞A54...目的研究通关藤Marsdenia tenacissima(Roxb.)Wight et Arn.的化学成分及其细胞毒活性。方法通关藤水提取物采用大孔树脂、硅胶、ODS、制备HPLC进行分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。采用MTT法评价其对肿瘤细胞A549、Bel-7402的细胞毒活性。结果从中分离得到12个化合物,分别鉴定为通关藤醇A(1)、12-O-惕各酰基-通关藤苷元A(2)、isoshonanin(3)、caruilignan D(4)、香草酸(5)、丁香酸(6)、通关藤苷元A(7)、白桦脂酸(8)、11-O-异丁酰基-12-O-乙酰基通关藤苷元B-3-O-茯苓二糖苷(9)、通关藤苷H(10)、通关藤苷G(11)、通关藤苷I(12)。化合物1~2、7、10、12能抑制A549、Bel-7402细胞的生长。结论化合物1为新化合物,化合物2为新天然产物,化合物3~6为首次从该植物中分离得到。化合物1~2、7、10、12具有细胞毒活性。展开更多
文摘Two new C21 steroids were isolated from the CHCl3 extract of the stem of Marsdenia tenacissima. On the basis of spectroscopic analysis and chemical methods, their structures were elucidated as 17β-tenacigenin B (2) and 3-O-6-deoxy-3-O-methyl-β-D-allopyranosyl-(1→4)-β-D- oleandropyranosyl-tenacigenin C (3). The structure of the known aglycon tenacigenin C was revised as 5α, 9α, 17β-pregnane-3β, 8β, 11α, 12β, 14β-pentanol-20-one. Compound 3 is the first reported glycoside of tenacigenin C.
文摘From the stems ofMarsdenia tenacissima two new polyoxypregnanes were isolated, their structures were elucidated by 1D, 2D-NMR as 11α,12β-di-O-tigloyl-tenacigenin B （1） and tenacigenoside E （2）.
文摘A new C21 steroid glycoside,11α-O-tigloyl-12-β-O-acetyl tenacigenin B 3-O-β-D-glucopyranosyl-（1→4）-β-D-glucopyr- anosyl-（1→4）-3-O-methyl-6-deoxy-β-D-allopyranosyl-（1→4）-β-D-oleandropyranoside（1）,named tenacissoside N was isolated from the stems of Marsdenia tenacissima.The structure of the glycoside was identified by HR-ESI-MS and NMR spectra.
文摘To establish an assessment of floristic and edaphic characteristics of steppe formations we conducted a phytoecological study on a local scale by comparing the current plant diversity and soil in three (3) stations representative of the vegetation to alfa (Stipa tenacissima L.) located south of Saida (western Algeria). The relations between the station, the vegetation and the characteristics of soils in the steppe are very imperfectly known. This study intends to analyze the relationship between floristic composition and edaphic parameters of the steppe at alfa. Anthropogenic pressures on plant structure are different imbalance resulting in one ecological. The floristic and edaphic data have been the subject of a factorial correspondence analysis (A.F.C). The floristic inventory denotes a regressive dynamics of the formations at alfa passing from one site to another. Thus 39 plant species have been inventoried in the site in good condition, against 26 species for the moderately degraded site and 16 species only for the damaged site. The coupled results between species and edaphic parameters show the relations between the plant diversity and the physico-chemical characteristics of the soils. The statistical analyses do appear a strong correlation between floristic composition, the state of vegetation and the edaphic parameters.
基金Yunnan Provincial Department of Education Science Research Fund Project(2018JS709)National Natural Science Foundation of China(81973264)Guangdong Basic and Applied Basic Research Foundation(2019A1515011954,2020A1515010593)。
文摘目的研究通关藤Marsdenia tenacissima(Roxb.)Wight et Arn.的化学成分及其细胞毒活性。方法通关藤水提取物采用大孔树脂、硅胶、ODS、制备HPLC进行分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。采用MTT法评价其对肿瘤细胞A549、Bel-7402的细胞毒活性。结果从中分离得到12个化合物,分别鉴定为通关藤醇A(1)、12-O-惕各酰基-通关藤苷元A(2)、isoshonanin(3)、caruilignan D(4)、香草酸(5)、丁香酸(6)、通关藤苷元A(7)、白桦脂酸(8)、11-O-异丁酰基-12-O-乙酰基通关藤苷元B-3-O-茯苓二糖苷(9)、通关藤苷H(10)、通关藤苷G(11)、通关藤苷I(12)。化合物1~2、7、10、12能抑制A549、Bel-7402细胞的生长。结论化合物1为新化合物,化合物2为新天然产物,化合物3~6为首次从该植物中分离得到。化合物1~2、7、10、12具有细胞毒活性。
