Objetive: To explore the potential insecticidal, ovipositor deterrent and antifeedant effects of ethyl acetate extract of the seeds of Senna tora(Syn. Cassia tora) against cowpea weevil(Callosobruchus maculatus).Metho...Objetive: To explore the potential insecticidal, ovipositor deterrent and antifeedant effects of ethyl acetate extract of the seeds of Senna tora(Syn. Cassia tora) against cowpea weevil(Callosobruchus maculatus).Method: The activities were evaluated using standard protocols.In these bioassays, the cowpea seeds were used directly as an insect feed. The activity of the extract and isolated compounds were tested at concentrations of 100, 200 and 300 μg/mL and compared to neem oil and cinnamaldehyde(as standard positive controls). Phytochemical analysis of the ethyl acetate extract was done through a number of chromatographic techniques and the structures of the isolated compounds were established through comprehensive spectroscopic analysis including 2 D-NMR and ESI-MS studies.Results: Fractionation of the active ethyl acetate extract resulted in the isolation of one known anthraquinone,aurantio-obtusin(1) and a novel compound that was named as cassiatorin(2). Compounds1 and 2 showed comparable insect antifeedant properties with the positive controls while their insecticidal and ovipositor deterrent effects were far superior to the standard controls.Conclusions: It is thus concluded that Senna tora extracts and the isolated compounds(1 and2) may be employed in the postharvest management of stored cowpea seeds and as other crop protectants.展开更多
目的建立两基原(决明、小决明)中药决明子的UPLC指纹图谱,为决明子药材质量控制和评价提供依据。方法采用Agilent ZORBAX EP C18(100 mm×3.0 mm,1.8μm)色谱柱;以乙腈-0.01%甲酸水溶液为流动相,梯度洗脱,体积流量0.4 m L/min,检测...目的建立两基原(决明、小决明)中药决明子的UPLC指纹图谱,为决明子药材质量控制和评价提供依据。方法采用Agilent ZORBAX EP C18(100 mm×3.0 mm,1.8μm)色谱柱;以乙腈-0.01%甲酸水溶液为流动相,梯度洗脱,体积流量0.4 m L/min,检测波长285 nm,柱温30℃,进样量为1μL。结果首次建立了决明子UPLC指纹图谱共有模式,运用相似度评价软件标定了20个共有峰,结合保留时间和紫外光谱分析,指认了7个峰;20批决明子药材相似度均大于0.9;聚类分析结果为当欧式距离平方和为5时,20批决明子样品可分为4类;主成分分析降维得到3个主成分,根据主成分得分将样品进行划分归类,与聚类分析结果一致;通过拟合归纳第一主成分的载荷因子模型,筛选出红链霉素-6-O-β-龙胆二糖苷等具有评价决明子质量优劣的特征峰。结论决明与小决明共有化学成分存在共性差异,该方法可以用于决明子药材质量控制和评价。展开更多
基金The financial assistance from the Swedish International Development Agency for some of the study (travel grant for Valantine Mbatchou)
文摘Objetive: To explore the potential insecticidal, ovipositor deterrent and antifeedant effects of ethyl acetate extract of the seeds of Senna tora(Syn. Cassia tora) against cowpea weevil(Callosobruchus maculatus).Method: The activities were evaluated using standard protocols.In these bioassays, the cowpea seeds were used directly as an insect feed. The activity of the extract and isolated compounds were tested at concentrations of 100, 200 and 300 μg/mL and compared to neem oil and cinnamaldehyde(as standard positive controls). Phytochemical analysis of the ethyl acetate extract was done through a number of chromatographic techniques and the structures of the isolated compounds were established through comprehensive spectroscopic analysis including 2 D-NMR and ESI-MS studies.Results: Fractionation of the active ethyl acetate extract resulted in the isolation of one known anthraquinone,aurantio-obtusin(1) and a novel compound that was named as cassiatorin(2). Compounds1 and 2 showed comparable insect antifeedant properties with the positive controls while their insecticidal and ovipositor deterrent effects were far superior to the standard controls.Conclusions: It is thus concluded that Senna tora extracts and the isolated compounds(1 and2) may be employed in the postharvest management of stored cowpea seeds and as other crop protectants.
文摘目的建立两基原(决明、小决明)中药决明子的UPLC指纹图谱,为决明子药材质量控制和评价提供依据。方法采用Agilent ZORBAX EP C18(100 mm×3.0 mm,1.8μm)色谱柱;以乙腈-0.01%甲酸水溶液为流动相,梯度洗脱,体积流量0.4 m L/min,检测波长285 nm,柱温30℃,进样量为1μL。结果首次建立了决明子UPLC指纹图谱共有模式,运用相似度评价软件标定了20个共有峰,结合保留时间和紫外光谱分析,指认了7个峰;20批决明子药材相似度均大于0.9;聚类分析结果为当欧式距离平方和为5时,20批决明子样品可分为4类;主成分分析降维得到3个主成分,根据主成分得分将样品进行划分归类,与聚类分析结果一致;通过拟合归纳第一主成分的载荷因子模型,筛选出红链霉素-6-O-β-龙胆二糖苷等具有评价决明子质量优劣的特征峰。结论决明与小决明共有化学成分存在共性差异,该方法可以用于决明子药材质量控制和评价。
