Jet cooled CN radical beam was formed by cold cathode DC discharge of CH3CNunder molecular beam conditions. The cylindrical cold cathode was placed between the skimmerand the nozzle to prevent the nozzle from being cl...Jet cooled CN radical beam was formed by cold cathode DC discharge of CH3CNunder molecular beam conditions. The cylindrical cold cathode was placed between the skimmerand the nozzle to prevent the nozzle from being clogged by carbon particles. The pulsed photoncounting LIF measurement was seriously jeopardized by the high intensive scattering laser lightdue to CN(B2Z)’s short lifetime (70ns) and weak fiuorescence. By using an attenuator to reducelaser intensity or a polaroid to reduce the scattering laser intensity, we obtained LIF spectra withgood S/N ratio. With the theoretical simulasd spectra, the effects of laser p0larization on LIFwere discussed and the relative populations of CN rotational and vibrational states were obtained.展开更多
[目的]建立乙肝清胶囊中槲皮素含量的HPLC测定方法。[方法]采用高效液相色谱法,色谱条件为：色谱柱,Phenomenex Luna C18柱（4.6mm×250mm,5μm）;流动相,甲醇-0.4%磷酸（50∶50）;流速,1ml/min;检测波长360nm;柱温30℃。[结果]槲...[目的]建立乙肝清胶囊中槲皮素含量的HPLC测定方法。[方法]采用高效液相色谱法,色谱条件为：色谱柱,Phenomenex Luna C18柱（4.6mm×250mm,5μm）;流动相,甲醇-0.4%磷酸（50∶50）;流速,1ml/min;检测波长360nm;柱温30℃。[结果]槲皮素在0.054～1.08μg范围内与峰面积有良好的线性关系,相关系数r=0.99988,平均回收率99.15%,RSD1.42%（n=6）。[结论]该方法简便、准确、可靠,可作为乙肝清胶囊中槲皮素含量的测定方法。展开更多
文摘Jet cooled CN radical beam was formed by cold cathode DC discharge of CH3CNunder molecular beam conditions. The cylindrical cold cathode was placed between the skimmerand the nozzle to prevent the nozzle from being clogged by carbon particles. The pulsed photoncounting LIF measurement was seriously jeopardized by the high intensive scattering laser lightdue to CN(B2Z)’s short lifetime (70ns) and weak fiuorescence. By using an attenuator to reducelaser intensity or a polaroid to reduce the scattering laser intensity, we obtained LIF spectra withgood S/N ratio. With the theoretical simulasd spectra, the effects of laser p0larization on LIFwere discussed and the relative populations of CN rotational and vibrational states were obtained.
文摘[目的]建立乙肝清胶囊中槲皮素含量的HPLC测定方法。[方法]采用高效液相色谱法,色谱条件为：色谱柱,Phenomenex Luna C18柱（4.6mm×250mm,5μm）;流动相,甲醇-0.4%磷酸（50∶50）;流速,1ml/min;检测波长360nm;柱温30℃。[结果]槲皮素在0.054～1.08μg范围内与峰面积有良好的线性关系,相关系数r=0.99988,平均回收率99.15%,RSD1.42%（n=6）。[结论]该方法简便、准确、可靠,可作为乙肝清胶囊中槲皮素含量的测定方法。
