Objective:To analyze the larvicidal activity of two plant leaf powder and leaf-extracts, Dregea volubilis and Bombax malabaricum against Culex quinquefasciatus.Methods:The larvicidal bioassay was done for powdered lea...Objective:To analyze the larvicidal activity of two plant leaf powder and leaf-extracts, Dregea volubilis and Bombax malabaricum against Culex quinquefasciatus.Methods:The larvicidal bioassay was done for powdered leaves of Dregea volubilis and Bombax malabaricum individually and their methanol extracts against first-,second-,third- and fourth-instar larval forms of Culex quinquefasciatus.Mortality rate was recorded after 24,48 and 72 h of postexposure. LC<sub>50</sub> and LG<sub>90</sub> values were calculated at different time intervals for third instar larvae. Results:All the graded concentration（0.1%,0.2%,0.3%,0.4%,0.5%） of powdered leaves showed significant（P 【0.05） larval mortality.The mortality rate was higher in 50 ppm doses of methanolic extracts of both the plants against Culex quinquefaciatus.The corresponding 【C<sub>50</sub> values were 56.97 ppm and 48.85 ppm,respectively after 24 h of exposure.There is no mortality of non-target organism such as Chironomous circumdatus,Oreochromis niloticus niloticus and Diplonichus annulatum within 72 h of post exposure to 0.1%,0.2%,0.3%crude powdered leaves and methanolic extracts of both the two individual plants under the laboratory condition.The results of preliminary qualitative phytochemical analysis of both the plants revealed the presence of many bioactive principles such as steroids,tannins,flavonoids,triterpenoids,saponins,etc. that may be responsible for their bio-control potentiality.Conclusions:The results have shown potential and eco-friendly use of both plant extracts against larva of Culex quinquefasciatus for the first time.展开更多
从萝藦科南山藤属植物南山藤的干燥茎中分离鉴定了6个化合物:β-D-黄夹吡喃糖基-(1→4)-β-D-磁麻吡喃糖基-(1→4)-β-D-阿洛吡喃糖苷(1),β-D-黄夹吡喃糖基-(1→4)-β-D-磁麻吡喃糖苷(2),marsectohexol(3),drevogenin D 3-O-β-D-磁麻...从萝藦科南山藤属植物南山藤的干燥茎中分离鉴定了6个化合物:β-D-黄夹吡喃糖基-(1→4)-β-D-磁麻吡喃糖基-(1→4)-β-D-阿洛吡喃糖苷(1),β-D-黄夹吡喃糖基-(1→4)-β-D-磁麻吡喃糖苷(2),marsectohexol(3),drevogenin D 3-O-β-D-磁麻吡喃糖苷(4),dregeosides Da1(5),dregeosides A11(6)。其中,化合物1为新低聚糖,化合物4为首次从属内分得C21甾体苷。展开更多
【目的】以贯筋藤为原料,探究其提取物对小鼠迟发型超敏反应(delayed type hypersensitivity,DTH)的影响.【方法】通过乙醇辅助超声萃取的方法制备贯筋藤粗提物,采用泼尼松连续灌胃建立免疫抑制小鼠模型,以2,4-二硝基氟苯诱导DTH,检测...【目的】以贯筋藤为原料,探究其提取物对小鼠迟发型超敏反应(delayed type hypersensitivity,DTH)的影响.【方法】通过乙醇辅助超声萃取的方法制备贯筋藤粗提物,采用泼尼松连续灌胃建立免疫抑制小鼠模型,以2,4-二硝基氟苯诱导DTH,检测贯筋藤提取物对模型小鼠耳肿胀度的影响,计算胸腺和脾脏指数,酶联免疫吸附法检测小鼠血清干扰素-γ(IFN-γ)含量.【结果】明显减轻正常免疫小鼠耳廓肿胀度(P<0.01),对免疫抑制小鼠有减轻趋势,但无显著性差异(P>0.05);对小鼠胸腺和脾脏指数的影响无显著性差异(P>0.05);显著性降低正常免疫小鼠血清IFN-γ含量(P<0.05),对免疫抑制小鼠有降低趋势,但没有统计学差异(P>0.05).【结论】贯筋藤提取物对DTH小鼠具有明显的免疫抑制作用,其作用机制可能是通过抑制淋巴细胞分泌IFN-γ水平.展开更多
文摘Objective:To analyze the larvicidal activity of two plant leaf powder and leaf-extracts, Dregea volubilis and Bombax malabaricum against Culex quinquefasciatus.Methods:The larvicidal bioassay was done for powdered leaves of Dregea volubilis and Bombax malabaricum individually and their methanol extracts against first-,second-,third- and fourth-instar larval forms of Culex quinquefasciatus.Mortality rate was recorded after 24,48 and 72 h of postexposure. LC<sub>50</sub> and LG<sub>90</sub> values were calculated at different time intervals for third instar larvae. Results:All the graded concentration（0.1%,0.2%,0.3%,0.4%,0.5%） of powdered leaves showed significant（P 【0.05） larval mortality.The mortality rate was higher in 50 ppm doses of methanolic extracts of both the plants against Culex quinquefaciatus.The corresponding 【C<sub>50</sub> values were 56.97 ppm and 48.85 ppm,respectively after 24 h of exposure.There is no mortality of non-target organism such as Chironomous circumdatus,Oreochromis niloticus niloticus and Diplonichus annulatum within 72 h of post exposure to 0.1%,0.2%,0.3%crude powdered leaves and methanolic extracts of both the two individual plants under the laboratory condition.The results of preliminary qualitative phytochemical analysis of both the plants revealed the presence of many bioactive principles such as steroids,tannins,flavonoids,triterpenoids,saponins,etc. that may be responsible for their bio-control potentiality.Conclusions:The results have shown potential and eco-friendly use of both plant extracts against larva of Culex quinquefasciatus for the first time.
文摘从萝藦科南山藤属植物南山藤的干燥茎中分离鉴定了6个化合物:β-D-黄夹吡喃糖基-(1→4)-β-D-磁麻吡喃糖基-(1→4)-β-D-阿洛吡喃糖苷(1),β-D-黄夹吡喃糖基-(1→4)-β-D-磁麻吡喃糖苷(2),marsectohexol(3),drevogenin D 3-O-β-D-磁麻吡喃糖苷(4),dregeosides Da1(5),dregeosides A11(6)。其中,化合物1为新低聚糖,化合物4为首次从属内分得C21甾体苷。
文摘【目的】以贯筋藤为原料,探究其提取物对小鼠迟发型超敏反应(delayed type hypersensitivity,DTH)的影响.【方法】通过乙醇辅助超声萃取的方法制备贯筋藤粗提物,采用泼尼松连续灌胃建立免疫抑制小鼠模型,以2,4-二硝基氟苯诱导DTH,检测贯筋藤提取物对模型小鼠耳肿胀度的影响,计算胸腺和脾脏指数,酶联免疫吸附法检测小鼠血清干扰素-γ(IFN-γ)含量.【结果】明显减轻正常免疫小鼠耳廓肿胀度(P<0.01),对免疫抑制小鼠有减轻趋势,但无显著性差异(P>0.05);对小鼠胸腺和脾脏指数的影响无显著性差异(P>0.05);显著性降低正常免疫小鼠血清IFN-γ含量(P<0.05),对免疫抑制小鼠有降低趋势,但没有统计学差异(P>0.05).【结论】贯筋藤提取物对DTH小鼠具有明显的免疫抑制作用,其作用机制可能是通过抑制淋巴细胞分泌IFN-γ水平.
