研究60Coγ-射线不同剂量辐照落花生茎叶提取生物碱的工艺条件及参数,并分析落花生茎叶生物碱的种类。采用紫外分光光度法测定总生物碱的含量或吸光值,考察大孔树脂种类、型号,洗脱液的种类、浓度等对落花生茎叶总生物碱纯化效果的影响...研究60Coγ-射线不同剂量辐照落花生茎叶提取生物碱的工艺条件及参数,并分析落花生茎叶生物碱的种类。采用紫外分光光度法测定总生物碱的含量或吸光值,考察大孔树脂种类、型号,洗脱液的种类、浓度等对落花生茎叶总生物碱纯化效果的影响,并用液相色谱对落花生茎叶生物碱进行定性定量分析。结果显示,总生物碱含量随吸收剂量的增加,先上升后下降;在吸收剂量为5 k Gy时达到最高(7.970±0.117)%,显著优于超声波提取法的(1.485±0.061)%(t检验,p<0.001)。大孔树脂AB-8的纯化效果最好,洗脱溶媒为60%甲醇时洗脱效果最好,获得的生物碱纯度可达99.99%。高效液相色谱结果分析表明,落花生茎叶生物碱主要为胆碱,其含量约为2.61 g·kg-1花生茎叶。展开更多
利用正交试验发展一种柱前衍生后使用高效液相色谱测定水溶液中甲醛含量的重要方法。本文详细对衍生时的产生影响的因素:加热温度、加热振荡时间及2,4-二硝基苯肼用量进行了考察,利用正交试验选出其中最佳条件,实验结果表明在50℃下加...利用正交试验发展一种柱前衍生后使用高效液相色谱测定水溶液中甲醛含量的重要方法。本文详细对衍生时的产生影响的因素:加热温度、加热振荡时间及2,4-二硝基苯肼用量进行了考察,利用正交试验选出其中最佳条件,实验结果表明在50℃下加热60分钟,加入0.2 mL 2,4--二硝基苯肼效果最好。展开更多
The enantioseparation of dencichine and its D-isomer was achieved on a novel chiral stationary phase via coating N-（2-hydroxyl-3-octoxyl） propyl-S-benzyl-（L）-cysteine on YWG-C18 phase by ligand exchange chromatogr...The enantioseparation of dencichine and its D-isomer was achieved on a novel chiral stationary phase via coating N-（2-hydroxyl-3-octoxyl） propyl-S-benzyl-（L）-cysteine on YWG-C18 phase by ligand exchange chromatography.展开更多
The synthesis and characterization of a series of peptide dendronswith glycin（Gly） and glutamate（Glu） as building blocks were described.The dendrons were prepared with convergent method by protection,deprotection ...The synthesis and characterization of a series of peptide dendronswith glycin（Gly） and glutamate（Glu） as building blocks were described.The dendrons were prepared with convergent method by protection,deprotection and DCC coupling reactions.With the characterization of elemental analysis,（）1H-NMR,（）13C-NMR,FTIR,EI-MS and MAILD-TOF MS,the designed molecular structure was proved.It could be predicted that the obtained compounds will exhibit unique properties and potential applications in the fields of biology,medicine and so on.Further studies on the properties of these compounds are in progress.展开更多
文摘研究60Coγ-射线不同剂量辐照落花生茎叶提取生物碱的工艺条件及参数,并分析落花生茎叶生物碱的种类。采用紫外分光光度法测定总生物碱的含量或吸光值,考察大孔树脂种类、型号,洗脱液的种类、浓度等对落花生茎叶总生物碱纯化效果的影响,并用液相色谱对落花生茎叶生物碱进行定性定量分析。结果显示,总生物碱含量随吸收剂量的增加,先上升后下降;在吸收剂量为5 k Gy时达到最高(7.970±0.117)%,显著优于超声波提取法的(1.485±0.061)%(t检验,p<0.001)。大孔树脂AB-8的纯化效果最好,洗脱溶媒为60%甲醇时洗脱效果最好,获得的生物碱纯度可达99.99%。高效液相色谱结果分析表明,落花生茎叶生物碱主要为胆碱,其含量约为2.61 g·kg-1花生茎叶。
文摘The enantioseparation of dencichine and its D-isomer was achieved on a novel chiral stationary phase via coating N-（2-hydroxyl-3-octoxyl） propyl-S-benzyl-（L）-cysteine on YWG-C18 phase by ligand exchange chromatography.
文摘The synthesis and characterization of a series of peptide dendronswith glycin（Gly） and glutamate（Glu） as building blocks were described.The dendrons were prepared with convergent method by protection,deprotection and DCC coupling reactions.With the characterization of elemental analysis,（）1H-NMR,（）13C-NMR,FTIR,EI-MS and MAILD-TOF MS,the designed molecular structure was proved.It could be predicted that the obtained compounds will exhibit unique properties and potential applications in the fields of biology,medicine and so on.Further studies on the properties of these compounds are in progress.
