Three new amide alkaloids piperlongumamides A-C(1-3),together with 12 known ones(4-15),were isolated from the fruits of Piper longum.The structures of the new isolates were determined using spectroscopic data analyses...Three new amide alkaloids piperlongumamides A-C(1-3),together with 12 known ones(4-15),were isolated from the fruits of Piper longum.The structures of the new isolates were determined using spectroscopic data analyses.Cytotoxic activity of these amides against HL-60(human leukemia),A-549(human lung cancer),MCF-7(human breast cancer),SMMC-7721(human liver cancer)and SW480(human rectal cancer)cell lines were evaluated.Piperchabamide B(11)exhibited weak inhibitory activity against HL-60(IC_(50)=21.32μM),A-549(IC_(50)=23.82μM)and MCF-7(IC_(50)=16.58μM)cell lines.展开更多
Objective:To isolate the larvicidal component from the fruits of Piper longum(P.longum) against the filariasis vector,Culex quinquefasciatus(C.quinquefasciatus).Methods:Pulverized fruits of P.longum were subjected...Objective:To isolate the larvicidal component from the fruits of Piper longum(P.longum) against the filariasis vector,Culex quinquefasciatus(C.quinquefasciatus).Methods:Pulverized fruits of P.longum were subjected to soxhlet extraction using series of organic solvents of increasing polarity.All the solvent extracts were verified for their larvicidal efficacy against 4th instar larvae of C.quinquefasciatus employing standard WHO procedure.Bioassayguided fractionation through column chromatography lead to the isolation of a bioactive amide, pipyahyine from the petroleum ether extract.Results:Petroleum ether extract was found to be the most active fraction among all the extracts tested with LC<sub>50</sub> and LC<sub>90</sub> being 1.03 and 2.04 ppm respectively.Whereas,pipyahyine,an isolated component of the same fraction was found to be even more effective than the parent extract in terms of LC<sub>50</sub> being 0.58 and 1.88 ppm respectively. Conclusions:From the results,it is evident that P.longum can be considered as a powerful arsenal for the control of mosquito population.展开更多
目的观察荜茇乙醇提取物(Ethanol Extract of Piper LongumL.,EEPL)对胰岛素抵抗综合征(IRS)模型大鼠免疫功能的影响。方法采用高脂高糖高盐膳食造模,高脂饲料造模4周后,各组给予相应药物,给药8周后处死大鼠,于无菌条件下取大鼠脾淋巴...目的观察荜茇乙醇提取物(Ethanol Extract of Piper LongumL.,EEPL)对胰岛素抵抗综合征(IRS)模型大鼠免疫功能的影响。方法采用高脂高糖高盐膳食造模,高脂饲料造模4周后,各组给予相应药物,给药8周后处死大鼠,于无菌条件下取大鼠脾淋巴细胞、自然杀伤细胞(NK)和腹腔巨噬细胞(Mφ),采用中性红法检测Mφ吞噬功能,MTT法检测T、B淋巴细胞增殖活性和NK细胞的自然杀伤力。结果与模型对照组比较,EEPL高、中剂量组T、B淋巴细胞增殖率明显升高(P<0.05或P<0.01),EEPL各剂量组NK细胞杀伤率和Mφ吞噬能力明显提高,差异有统计学意义(P<0.05或P<0.01)。结论 EEPL具有改善IRS模型大鼠免疫功能的作用。展开更多
基金This work was funded by the Natural Science Foundation of Yunnan Province,China(No.2011FZ205)the National Natural Science Foundation of China(Nos.31070288,31161140345)+1 种基金the Ministry of Education of China through its 111 and 985 projects(Nos.B08044,MUC98506-01000101&MUC985-9)the Japan Society for the Promotion of Science(No.JSPS/AP/109080).
文摘Three new amide alkaloids piperlongumamides A-C(1-3),together with 12 known ones(4-15),were isolated from the fruits of Piper longum.The structures of the new isolates were determined using spectroscopic data analyses.Cytotoxic activity of these amides against HL-60(human leukemia),A-549(human lung cancer),MCF-7(human breast cancer),SMMC-7721(human liver cancer)and SW480(human rectal cancer)cell lines were evaluated.Piperchabamide B(11)exhibited weak inhibitory activity against HL-60(IC_(50)=21.32μM),A-549(IC_(50)=23.82μM)and MCF-7(IC_(50)=16.58μM)cell lines.
基金Department of Science and Technology,New Delhi,India for providing financial assistance under women scientist scheme-B
文摘Objective:To isolate the larvicidal component from the fruits of Piper longum(P.longum) against the filariasis vector,Culex quinquefasciatus(C.quinquefasciatus).Methods:Pulverized fruits of P.longum were subjected to soxhlet extraction using series of organic solvents of increasing polarity.All the solvent extracts were verified for their larvicidal efficacy against 4th instar larvae of C.quinquefasciatus employing standard WHO procedure.Bioassayguided fractionation through column chromatography lead to the isolation of a bioactive amide, pipyahyine from the petroleum ether extract.Results:Petroleum ether extract was found to be the most active fraction among all the extracts tested with LC<sub>50</sub> and LC<sub>90</sub> being 1.03 and 2.04 ppm respectively.Whereas,pipyahyine,an isolated component of the same fraction was found to be even more effective than the parent extract in terms of LC<sub>50</sub> being 0.58 and 1.88 ppm respectively. Conclusions:From the results,it is evident that P.longum can be considered as a powerful arsenal for the control of mosquito population.