Callisalignenes G–I(1–3),three new meroterpenoids of b-triketone and monoterpene,along with two known analogues(4 and 5),were isolated from Callistemon salignus.Their structures and absolute configurations were unam...Callisalignenes G–I(1–3),three new meroterpenoids of b-triketone and monoterpene,along with two known analogues(4 and 5),were isolated from Callistemon salignus.Their structures and absolute configurations were unambiguously established by a combination of NMR and MS analysis and electronic circular dichroism(ECD)evidence.Callisalignenes H(2)and I(3)have a rare sec-butyl moiety at C-7.Meroterpenoids 1–3 exhibited cytotoxicity against HCT116 cells with IC50 values of 8.51±1.8,9.12±0.3,and 16.33±3.3 lM,respectively.展开更多
Several phytoecdysteroids have been found in the extracts of A. multiflora and A.linearifolia using HPLC analysis. Those were 20-OH ecdysone, cyasterone, 3-acetate-20-OH ecdysone, 2-acetate-20-OH ecdysone, qugalactone...Several phytoecdysteroids have been found in the extracts of A. multiflora and A.linearifolia using HPLC analysis. Those were 20-OH ecdysone, cyasterone, 3-acetate-20-OH ecdysone, 2-acetate-20-OH ecdysone, qugalactone. We found out that those phytoecdysteroids could lead the second instar larva of Clostera anastomosis and Stipnotia candida to death. The modified mortality rate was from 44.64% to 96.24%. Those extracts could signiticantly reduce the amount of nymph produced by the female Tuberolachnus salignus, The number of the nymph produced after treating with those extracts was only 20% to 70% of that produced by the untreated group. The death rate of the newly produced nymph which treated was among 33.33% to 58.82%. It was much higher than the death rate of the control group (1l7.57%).展开更多
基金National Natural Science Foundation of China(Nos.31600283 and 31570363)fund of State Key Laboratory of Phytochemistry and Plant Resources in West China(No.P2017-ZZ04)from Kunming Institute of Botany,Chinese Academy of Sciences.
文摘Callisalignenes G–I(1–3),three new meroterpenoids of b-triketone and monoterpene,along with two known analogues(4 and 5),were isolated from Callistemon salignus.Their structures and absolute configurations were unambiguously established by a combination of NMR and MS analysis and electronic circular dichroism(ECD)evidence.Callisalignenes H(2)and I(3)have a rare sec-butyl moiety at C-7.Meroterpenoids 1–3 exhibited cytotoxicity against HCT116 cells with IC50 values of 8.51±1.8,9.12±0.3,and 16.33±3.3 lM,respectively.
文摘Several phytoecdysteroids have been found in the extracts of A. multiflora and A.linearifolia using HPLC analysis. Those were 20-OH ecdysone, cyasterone, 3-acetate-20-OH ecdysone, 2-acetate-20-OH ecdysone, qugalactone. We found out that those phytoecdysteroids could lead the second instar larva of Clostera anastomosis and Stipnotia candida to death. The modified mortality rate was from 44.64% to 96.24%. Those extracts could signiticantly reduce the amount of nymph produced by the female Tuberolachnus salignus, The number of the nymph produced after treating with those extracts was only 20% to 70% of that produced by the untreated group. The death rate of the newly produced nymph which treated was among 33.33% to 58.82%. It was much higher than the death rate of the control group (1l7.57%).
