Crude plant extracts of ringworm cassia, Cassia alata L. and turmeric, Curcuma longa L. were prepared by either hot water or organic solvents such as ethanol and ether. Various concentrations of the crude extract were...Crude plant extracts of ringworm cassia, Cassia alata L. and turmeric, Curcuma longa L. were prepared by either hot water or organic solvents such as ethanol and ether. Various concentrations of the crude extract were then subjected to an in vitro test for their effectiveness on mycelia growth inhibition against some important plant pathogenic fungi such as Alternaria alternata, Colletotrichum gloeosporioides, Fusarium oxysporum fsp. lycopersici, Sclerotium rolfsii, Phytophthora infestans and Pythium sp. in comparison to commercial fungicides such as copper oxychloride and mancozeb. Reduction of the fungal growth was significantly obtained with C. longa extracts and the best median effective inhibitory concentration (IC50) value of 6.07, 6.50 and 7.13 mg/ml was from the ethanol extract for S. rolfsii, C. gloeosporioides and F. oxysporum fsp. lycopersici respectively. While all extracts from C. alata were almost the least effective against these fungi. The efficacy of C. longa extracts therefore, provided an alternative regime for the control of the fungal diseases and a promising appreciable choice for a replacement of chemical fungicides.展开更多
目的:研究傣药“毫命”(姜黄Curcuma longa L.根茎)水提部位的化学成分。方法:采用大孔树脂柱层析、硅胶柱层析、半制备HPLC等多种色谱分离方法,对“毫命”水提部位中的成分进行分离纯化,根据理化性质和波谱数据对所得化合物进行结构鉴...目的:研究傣药“毫命”(姜黄Curcuma longa L.根茎)水提部位的化学成分。方法:采用大孔树脂柱层析、硅胶柱层析、半制备HPLC等多种色谱分离方法,对“毫命”水提部位中的成分进行分离纯化,根据理化性质和波谱数据对所得化合物进行结构鉴定。结果:从“毫命”水提部位中分离得到11个化合物,分别鉴定为:longpene E(1)、香草醇(2)、姜黄素(3)、去甲氧基姜黄素(4)、双去甲氧基姜黄素(5)、甜没药姜黄醇(6)、甜没药姜黄醇B(7)、intermedin B(8)、longpene C(9)、赤式-愈创木基甘油-β-松柏基醚(10)、新橄榄树脂素(11)。结论:其中,化合物1为新化合物,化合物10、11为首次从该植物中分离得到。展开更多
姜黄(Curcum a long a L)是一种多年生的草本植物,在医药上具有多种药理作用。近年来的研究成果表明,姜黄提取物在防除农业病虫害和储粮驱虫方面,对多种害虫和病菌具有明显的驱避、拒食、触杀、熏蒸、生长抑制和灭菌等生物活性,为研制...姜黄(Curcum a long a L)是一种多年生的草本植物,在医药上具有多种药理作用。近年来的研究成果表明,姜黄提取物在防除农业病虫害和储粮驱虫方面,对多种害虫和病菌具有明显的驱避、拒食、触杀、熏蒸、生长抑制和灭菌等生物活性,为研制生物杀菌、杀虫剂提供较好的理论依据。展开更多
文摘Crude plant extracts of ringworm cassia, Cassia alata L. and turmeric, Curcuma longa L. were prepared by either hot water or organic solvents such as ethanol and ether. Various concentrations of the crude extract were then subjected to an in vitro test for their effectiveness on mycelia growth inhibition against some important plant pathogenic fungi such as Alternaria alternata, Colletotrichum gloeosporioides, Fusarium oxysporum fsp. lycopersici, Sclerotium rolfsii, Phytophthora infestans and Pythium sp. in comparison to commercial fungicides such as copper oxychloride and mancozeb. Reduction of the fungal growth was significantly obtained with C. longa extracts and the best median effective inhibitory concentration (IC50) value of 6.07, 6.50 and 7.13 mg/ml was from the ethanol extract for S. rolfsii, C. gloeosporioides and F. oxysporum fsp. lycopersici respectively. While all extracts from C. alata were almost the least effective against these fungi. The efficacy of C. longa extracts therefore, provided an alternative regime for the control of the fungal diseases and a promising appreciable choice for a replacement of chemical fungicides.
