Two new triterpene esters, 2-O-caffeoylalphitolic acid (1) and methyl 2-O-caffeoyl- alphitolate (2), together with two known triterpenes were isolated from the shrub Daphniphyllum oldhami. The structures of new compou...Two new triterpene esters, 2-O-caffeoylalphitolic acid (1) and methyl 2-O-caffeoyl- alphitolate (2), together with two known triterpenes were isolated from the shrub Daphniphyllum oldhami. The structures of new compounds were elucidated on the basis of detailed spectroscopic analysis and compared with related compound.展开更多
A new flavan-3-ol glucoside, (-)-afzelechin-7-O-β-D-glucopyranoside (1), has been isolated from the stem of Daphniphyllum oldhami. The structure of the new compound was elucidated on the basis of detailed spectrosco...A new flavan-3-ol glucoside, (-)-afzelechin-7-O-β-D-glucopyranoside (1), has been isolated from the stem of Daphniphyllum oldhami. The structure of the new compound was elucidated on the basis of detailed spectroscopic analysis and comparison with related compounds.展开更多
Bambusa pervariabilis × Dendrocalamopsis grandis blight is caused by a toxin from the fungus Arthrinium phaeospermum(corda) M. B. Ellis. We used shaking culture in a modified Fries culture medium and methanol ext...Bambusa pervariabilis × Dendrocalamopsis grandis blight is caused by a toxin from the fungus Arthrinium phaeospermum(corda) M. B. Ellis. We used shaking culture in a modified Fries culture medium and methanol extraction to isolate the toxin. The optimal developing solvent mixture(methanol: ethyl acetate: H2O at 7:1.5:3) was selected using thin layer chromatography and used as the eluent for toxin purification by silica gel column chromatography. Two toxic fractions were identified in the bioassay. A flaxen oil substance, AP-Ⅰ, showed higher toxicity than a toxic white powder, AP-Ⅱ. The more toxic AP-Ⅰ was determined to be dibutyl phthalate(C16H22O4, molecular weight of 278) by mass spectrometry, nuclear magnetic resonance, and infrared spectrophotometry. Dibutyl phthalate might contribute to the pathogenesis of bamboo blight.展开更多
目的:建立微波消解-电感耦合等离子质谱方法(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)同时测定福安绿竹笋中的Al、As、Cr、Cd、Zn、Cu、Ca、Mo、Fe、Ni、Se、Pb、Hg这13种元素的方法。方法:样品经微波消解处理,以Sc、Ge...目的:建立微波消解-电感耦合等离子质谱方法(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)同时测定福安绿竹笋中的Al、As、Cr、Cd、Zn、Cu、Ca、Mo、Fe、Ni、Se、Pb、Hg这13种元素的方法。方法:样品经微波消解处理,以Sc、Ge、In、Bi为内标,在碰撞模式下应用ICP-MS同时测定其中的13种元素。结果:测得13种元素的线性良好,加标回收率为81.5%~115.2%,RSD在0.98%~6.40%。结论:该方法可满足福安绿竹笋中13种元素的同时测定。展开更多
基金supportd by the National Natural Science foundation for Outstanding Youth(30125044)partly funded by the"foundation for scholars come back from abroad"provided by Ministry of Education,Ministry of Personnel,and Chinese academy of Sciences.
文摘Two new triterpene esters, 2-O-caffeoylalphitolic acid (1) and methyl 2-O-caffeoyl- alphitolate (2), together with two known triterpenes were isolated from the shrub Daphniphyllum oldhami. The structures of new compounds were elucidated on the basis of detailed spectroscopic analysis and compared with related compound.
文摘A new flavan-3-ol glucoside, (-)-afzelechin-7-O-β-D-glucopyranoside (1), has been isolated from the stem of Daphniphyllum oldhami. The structure of the new compound was elucidated on the basis of detailed spectroscopic analysis and comparison with related compounds.
基金supported by the National Natural Science Foundation of China(31070578)the National Natural Science and Technology Resources Sharing Platform of China(2005DKA21207-13)
文摘Bambusa pervariabilis × Dendrocalamopsis grandis blight is caused by a toxin from the fungus Arthrinium phaeospermum(corda) M. B. Ellis. We used shaking culture in a modified Fries culture medium and methanol extraction to isolate the toxin. The optimal developing solvent mixture(methanol: ethyl acetate: H2O at 7:1.5:3) was selected using thin layer chromatography and used as the eluent for toxin purification by silica gel column chromatography. Two toxic fractions were identified in the bioassay. A flaxen oil substance, AP-Ⅰ, showed higher toxicity than a toxic white powder, AP-Ⅱ. The more toxic AP-Ⅰ was determined to be dibutyl phthalate(C16H22O4, molecular weight of 278) by mass spectrometry, nuclear magnetic resonance, and infrared spectrophotometry. Dibutyl phthalate might contribute to the pathogenesis of bamboo blight.
文摘目的:建立微波消解-电感耦合等离子质谱方法(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)同时测定福安绿竹笋中的Al、As、Cr、Cd、Zn、Cu、Ca、Mo、Fe、Ni、Se、Pb、Hg这13种元素的方法。方法:样品经微波消解处理,以Sc、Ge、In、Bi为内标,在碰撞模式下应用ICP-MS同时测定其中的13种元素。结果:测得13种元素的线性良好,加标回收率为81.5%~115.2%,RSD在0.98%~6.40%。结论:该方法可满足福安绿竹笋中13种元素的同时测定。
