为优化木棉花和木棉树皮总黄酮的减压内部沸腾提取工艺,提高总黄酮提取率,采用单因素试验的方法,考察解吸剂浓度、解吸时间、提取剂浓度、提取时间、提取温度及提取剂用量等6个因素对提取效果的影响,结果表明:木棉花用20%乙醇2.5 m L/g...为优化木棉花和木棉树皮总黄酮的减压内部沸腾提取工艺,提高总黄酮提取率,采用单因素试验的方法,考察解吸剂浓度、解吸时间、提取剂浓度、提取时间、提取温度及提取剂用量等6个因素对提取效果的影响,结果表明:木棉花用20%乙醇2.5 m L/g解吸15 min,30%乙醇120 m L/g在50℃和0.035 MPa下提取6 min,提取2次,提取率达到1.81%;木棉树皮用40%乙醇2.5 m L/g解吸25 min,30%乙醇50 m L/g在50℃和0.035 MPa下提取2次,每次5 min,提取率达到17.70%,而且木棉树皮总黄酮提取率是木棉花总黄酮的9.78倍。与传统醇回流提取相比,木棉花和树皮的总黄酮提取率分别提高了0.06、1.00百分点,但提取时间分别缩短了78、60 min,提取温度降低了34.7℃。减压内部沸腾提取的木棉树皮总黄酮抗氧化性研究表明,木棉树皮总黄酮对超氧阴离子、亚硝基的清除能力较强,清除率最高达到76.82%、78.33%。减压内部沸腾法快速高效,用于木棉不同部位总黄酮的提取效果良好,木棉树皮总黄酮具有较强的抗氧化活性。展开更多
OBJECTIVE: To evaluate the in vivo antiplasmodial activity and the oral acute toxicity of the Bombax buonopozense root bark aqueous extract.METHODS: The in vivo antiplasmodial activity of the root bark aqueous extract...OBJECTIVE: To evaluate the in vivo antiplasmodial activity and the oral acute toxicity of the Bombax buonopozense root bark aqueous extract.METHODS: The in vivo antiplasmodial activity of the root bark aqueous extract of Bombax buonopozense against early and established rodent malaria infections in chloroquine sensitive Plasmodium berghei strain in mice was investigated, and oral acute toxicity of the aqueous root bark extract of Bombax buonopozense was also evaluated in mice.RESULTS: The findings of this study revealed significant(P < 0.05) and dose dependent decrease in parasitaemia in the parasitized groups treated with varying doses of the extract(50-200 mg/kg p.o.) in both suppressive and curative tests. There was also significant decrease in parasitaemia density in the chloroquine treated group. The aqueous extract was found no toxicity in mice and the oral LD50 was determined to be greater than 5000 mg/kg.CONCLUSION: Bombax buonopozense root bark aqueous extract possesses potent antiplasmodial activity and may therefore, serve as potential sources of new antimalarial agents.展开更多
文摘为优化木棉花和木棉树皮总黄酮的减压内部沸腾提取工艺,提高总黄酮提取率,采用单因素试验的方法,考察解吸剂浓度、解吸时间、提取剂浓度、提取时间、提取温度及提取剂用量等6个因素对提取效果的影响,结果表明:木棉花用20%乙醇2.5 m L/g解吸15 min,30%乙醇120 m L/g在50℃和0.035 MPa下提取6 min,提取2次,提取率达到1.81%;木棉树皮用40%乙醇2.5 m L/g解吸25 min,30%乙醇50 m L/g在50℃和0.035 MPa下提取2次,每次5 min,提取率达到17.70%,而且木棉树皮总黄酮提取率是木棉花总黄酮的9.78倍。与传统醇回流提取相比,木棉花和树皮的总黄酮提取率分别提高了0.06、1.00百分点,但提取时间分别缩短了78、60 min,提取温度降低了34.7℃。减压内部沸腾提取的木棉树皮总黄酮抗氧化性研究表明,木棉树皮总黄酮对超氧阴离子、亚硝基的清除能力较强,清除率最高达到76.82%、78.33%。减压内部沸腾法快速高效,用于木棉不同部位总黄酮的提取效果良好,木棉树皮总黄酮具有较强的抗氧化活性。
文摘OBJECTIVE: To evaluate the in vivo antiplasmodial activity and the oral acute toxicity of the Bombax buonopozense root bark aqueous extract.METHODS: The in vivo antiplasmodial activity of the root bark aqueous extract of Bombax buonopozense against early and established rodent malaria infections in chloroquine sensitive Plasmodium berghei strain in mice was investigated, and oral acute toxicity of the aqueous root bark extract of Bombax buonopozense was also evaluated in mice.RESULTS: The findings of this study revealed significant(P < 0.05) and dose dependent decrease in parasitaemia in the parasitized groups treated with varying doses of the extract(50-200 mg/kg p.o.) in both suppressive and curative tests. There was also significant decrease in parasitaemia density in the chloroquine treated group. The aqueous extract was found no toxicity in mice and the oral LD50 was determined to be greater than 5000 mg/kg.CONCLUSION: Bombax buonopozense root bark aqueous extract possesses potent antiplasmodial activity and may therefore, serve as potential sources of new antimalarial agents.
