Objective:To identify the chemical constituents and evaluate antimicrobial potential of various crude extracts from leaves of Datura metel grown in Oman.Methods:The leaf samples were collected from the University of N...Objective:To identify the chemical constituents and evaluate antimicrobial potential of various crude extracts from leaves of Datura metel grown in Oman.Methods:The leaf samples were collected from the University of Nizwa and extracted with methanol by using Soxhlet extractor.The isolated crude extract was defatted with distilled water and extracted with solvents of different polarities including hexane,chloroform,ethyl acetate and butanol.Chemical compositions of the crude extracts were analyzed by gas chromatography-mass spectrometer and their antimicrobial potential was evaluated by agar disc diffusion method against one Gram positive bacteria Staphylococcus aureus and two Gram negative bacteria Escherichia coli and Pseudomonus aeruginosa.Results:The crude extracts were composed of different organic compounds such as alkaloids,hydrocarbons,aromatic hydrocarbons,organic acids,terpenoids,vitamin etc.The methanol and its fractionated crude extracts showed antimicrobial potential with inhibition zone in the range of 0-13 mm.Conclusions:The selective crude extract from the leaves of Datura metel could be used as natural antibiotics.展开更多
Three new with anolides,daturaselines A-C(1-3),and three new with anolides glycosides,daturasesides A-C(4-6),were isolated and identified from ethyl acetate-soluble fraction of ethanol extract of Datura metel seeds.Th...Three new with anolides,daturaselines A-C(1-3),and three new with anolides glycosides,daturasesides A-C(4-6),were isolated and identified from ethyl acetate-soluble fraction of ethanol extract of Datura metel seeds.The structures of new compounds were established according to the 1D and 2D NMR spectra,combined with high resolution展开更多
目的探讨洋金花醉茄内酯类化合物对银屑病小鼠肠道中Th17/Treg细胞功能的影响。方法采用经典的银屑病小鼠模型,即咪喹莫特乳膏(IMQ)诱导小鼠背部皮肤产生银屑病样病理模型,并随机分为四组,即空白组、模型组、洋金花组和雷公藤阳性药物...目的探讨洋金花醉茄内酯类化合物对银屑病小鼠肠道中Th17/Treg细胞功能的影响。方法采用经典的银屑病小鼠模型,即咪喹莫特乳膏(IMQ)诱导小鼠背部皮肤产生银屑病样病理模型,并随机分为四组,即空白组、模型组、洋金花组和雷公藤阳性药物组。采用Psoriasis area and severity index(PASI)分析各组皮损严重程度;应用流式细胞法检测小鼠肠系膜淋巴结中Th17/Treg细胞数量表达;应用酶联免疫吸附法(ELISA法)依次检测肠粘膜中Th17/Treg细胞相关因子的含量。结果洋金花组能减少IMQ诱导的PASI评分,降低肠系膜中Th17细胞表达及相关细胞因子,而升高Treg细胞的表达及相关细胞因子。结论洋金花醉茄内酯类化合物可降低银屑病小鼠肠道Th17细胞功能,同时升高Treg细胞功能,进一步提示在肠-免疫-皮肤轴中,洋金花醉茄内酯类化合物通过影响肠道中的Th17/Treg细胞免疫平衡而达到防治银屑病的作用。展开更多
基金Supported by Central Instrument Laboratory,College of Agriculture and Marine Sciences,Sultan Qaboos University,Sultanate of Oman(Grant No.507/SOP/OB/1/2013).
文摘Objective:To identify the chemical constituents and evaluate antimicrobial potential of various crude extracts from leaves of Datura metel grown in Oman.Methods:The leaf samples were collected from the University of Nizwa and extracted with methanol by using Soxhlet extractor.The isolated crude extract was defatted with distilled water and extracted with solvents of different polarities including hexane,chloroform,ethyl acetate and butanol.Chemical compositions of the crude extracts were analyzed by gas chromatography-mass spectrometer and their antimicrobial potential was evaluated by agar disc diffusion method against one Gram positive bacteria Staphylococcus aureus and two Gram negative bacteria Escherichia coli and Pseudomonus aeruginosa.Results:The crude extracts were composed of different organic compounds such as alkaloids,hydrocarbons,aromatic hydrocarbons,organic acids,terpenoids,vitamin etc.The methanol and its fractionated crude extracts showed antimicrobial potential with inhibition zone in the range of 0-13 mm.Conclusions:The selective crude extract from the leaves of Datura metel could be used as natural antibiotics.
基金Major State BasicResearch Development Program(973 Program)of China(2013CB531801)Chang Jiang Scholar Candidates Programme for Provincial Universities in Heilongjiang(2013CJHB00)
文摘Three new with anolides,daturaselines A-C(1-3),and three new with anolides glycosides,daturasesides A-C(4-6),were isolated and identified from ethyl acetate-soluble fraction of ethanol extract of Datura metel seeds.The structures of new compounds were established according to the 1D and 2D NMR spectra,combined with high resolution
文摘目的探讨洋金花醉茄内酯类化合物对银屑病小鼠肠道中Th17/Treg细胞功能的影响。方法采用经典的银屑病小鼠模型,即咪喹莫特乳膏(IMQ)诱导小鼠背部皮肤产生银屑病样病理模型,并随机分为四组,即空白组、模型组、洋金花组和雷公藤阳性药物组。采用Psoriasis area and severity index(PASI)分析各组皮损严重程度;应用流式细胞法检测小鼠肠系膜淋巴结中Th17/Treg细胞数量表达;应用酶联免疫吸附法(ELISA法)依次检测肠粘膜中Th17/Treg细胞相关因子的含量。结果洋金花组能减少IMQ诱导的PASI评分,降低肠系膜中Th17细胞表达及相关细胞因子,而升高Treg细胞的表达及相关细胞因子。结论洋金花醉茄内酯类化合物可降低银屑病小鼠肠道Th17细胞功能,同时升高Treg细胞功能,进一步提示在肠-免疫-皮肤轴中,洋金花醉茄内酯类化合物通过影响肠道中的Th17/Treg细胞免疫平衡而达到防治银屑病的作用。