The excited state of Chlorophyll a is investiga.ted by ferntosecond transient absorption. The transient absorption spectra of Q band and By band of Chlorophyll a in ethanol have been observed. The fast kinetics of Chl...The excited state of Chlorophyll a is investiga.ted by ferntosecond transient absorption. The transient absorption spectra of Q band and By band of Chlorophyll a in ethanol have been observed. The fast kinetics of Chlorophyll a which exhibit two ultrafast components were also ineasured. The one is assigned to transient absorption of the inhomogencously broadened ground state absorption spectrum, while the other is the response of the solvent to the change of the electron configuration in the excited state due to solvation dynamics of the polar solvent molecules. To understand the anisotropy of Chlorophyll a in ethanol, the anisotropy profile was also performed by 405 nm excitation and found that the anisotropy profile is 0.143. The possible combination of θda, θdb and η at at excitation of By band has been simulated.展开更多
目的筛选广金钱草挥发油抗炎作用的关键化学成分及靶标蛋白。方法采用水蒸气蒸馏法提取广金钱草中的挥发油,通过气相色谱-质谱联用法鉴定其化学成分,采用峰面积归一化法测定其化学成分的相对含量。基于中药系统药理学技术平台(Tradition...目的筛选广金钱草挥发油抗炎作用的关键化学成分及靶标蛋白。方法采用水蒸气蒸馏法提取广金钱草中的挥发油,通过气相色谱-质谱联用法鉴定其化学成分,采用峰面积归一化法测定其化学成分的相对含量。基于中药系统药理学技术平台(Traditional Chinese Medicine Systems Pharmacology,TCMSP)建立小分子配体库,借助Swiss Target Prediction在线进行反向靶标预测,通过KOBAX 3.0筛选抗炎通路,采用分子对接技术(SYBYL 2.1)将关键小分子与瞬时受体电位(TRP)通路中的靶标蛋白进行能量匹配,基于Cytoscape3.5.1构建化学成分-靶标网络模型。结果从广金钱草挥发油中共检测出48个色谱峰,通过质谱库及文献检索确定33种化合物结构,占挥发油总量的90.1%。关键化学成分17个,共筛选出88个靶标蛋白,TRP通路包括11个潜在靶标。分子对接发现叶绿醇、三十一烷、法尼基丙酮和角鲨烯等为广金钱草挥发油发挥抗炎作用的关键化学成分。TPRV1、PRKCB和PRKCD为抗炎关键靶标蛋白。结论初步筛选了广金钱草挥发油抗炎的关键靶点及活性成分,为其产品的开发和应用提供理论依据。展开更多
基金This work was supported by tile National Natural Science Foundation of China （NSFCNo.29825107,No.29853001）,the Knowledge Innovation Program of the Chinese Academy of Sciences（Grant：DICP K200/E3）and NKBRSF,Support is also provided from the National Science Council of Taiwan and Academia Sinica.
文摘The excited state of Chlorophyll a is investiga.ted by ferntosecond transient absorption. The transient absorption spectra of Q band and By band of Chlorophyll a in ethanol have been observed. The fast kinetics of Chlorophyll a which exhibit two ultrafast components were also ineasured. The one is assigned to transient absorption of the inhomogencously broadened ground state absorption spectrum, while the other is the response of the solvent to the change of the electron configuration in the excited state due to solvation dynamics of the polar solvent molecules. To understand the anisotropy of Chlorophyll a in ethanol, the anisotropy profile was also performed by 405 nm excitation and found that the anisotropy profile is 0.143. The possible combination of θda, θdb and η at at excitation of By band has been simulated.
文摘目的筛选广金钱草挥发油抗炎作用的关键化学成分及靶标蛋白。方法采用水蒸气蒸馏法提取广金钱草中的挥发油,通过气相色谱-质谱联用法鉴定其化学成分,采用峰面积归一化法测定其化学成分的相对含量。基于中药系统药理学技术平台(Traditional Chinese Medicine Systems Pharmacology,TCMSP)建立小分子配体库,借助Swiss Target Prediction在线进行反向靶标预测,通过KOBAX 3.0筛选抗炎通路,采用分子对接技术(SYBYL 2.1)将关键小分子与瞬时受体电位(TRP)通路中的靶标蛋白进行能量匹配,基于Cytoscape3.5.1构建化学成分-靶标网络模型。结果从广金钱草挥发油中共检测出48个色谱峰,通过质谱库及文献检索确定33种化合物结构,占挥发油总量的90.1%。关键化学成分17个,共筛选出88个靶标蛋白,TRP通路包括11个潜在靶标。分子对接发现叶绿醇、三十一烷、法尼基丙酮和角鲨烯等为广金钱草挥发油发挥抗炎作用的关键化学成分。TPRV1、PRKCB和PRKCD为抗炎关键靶标蛋白。结论初步筛选了广金钱草挥发油抗炎的关键靶点及活性成分,为其产品的开发和应用提供理论依据。
