Oligodeoxynucleotide from SARS virus was selected and synthesized. Its complexes with alkaloid compounds were investigated by electrospray mass spectrometry. We found that three alkaloid compounds could interact with ...Oligodeoxynucleotide from SARS virus was selected and synthesized. Its complexes with alkaloid compounds were investigated by electrospray mass spectrometry. We found that three alkaloid compounds could interact with the DNA target molecule in five alkaloids analyzed. With increasing molar ratio of the three alkaloid compounds, the complexes between alkaloids and DNA with different stoichiometric ratios were found in their MS spectra. The order of the alkalinity of their gas phase corresponds to that of liquid phase, that is: Palmatine>Jatrorrhizine>Berberin. The relative abundance of these complexes in mass spectra can assess the relative affinities of above three alkaloid compounds with the DNA target molecule. In this paper, the binding sites between jatrorrhizine and DNA was deduced from the interaction experiments of jatrorrhizine with three nucleosides.展开更多
负离子电喷雾-傅里叶变化离子回旋共振质谱仪(Neg ESI FT-ICR MS)具有超高的分辨率,可用于分析重油中杂原子化合物的组成及分布。运用Neg ESI FT-ICR MS,研究委内瑞拉奥里常渣减黏裂化反应前后杂原子化合物,建立了分子组成的解析方法。...负离子电喷雾-傅里叶变化离子回旋共振质谱仪(Neg ESI FT-ICR MS)具有超高的分辨率,可用于分析重油中杂原子化合物的组成及分布。运用Neg ESI FT-ICR MS,研究委内瑞拉奥里常渣减黏裂化反应前后杂原子化合物,建立了分子组成的解析方法。结果表明,常渣中O2类化合物的相对丰度最大,减黏产物中N1类化合物的相对丰度最大。不同缩合度,质荷比小的O2类化合物减黏裂化反应后显著增加。委内瑞拉常渣及其减黏产物中相对丰度最强的O2类化合物均是双环环烷酸。减黏裂化反应使得O2类化合物发生了裂化反应,生成碳数更少、分子质量更小的化合物。展开更多
针对某炼厂酮苯脱蜡装置原料油(减三线)中酸性物质组成特殊(对装置产生严重的腐蚀)的情况,采用碱醇法提取其中的酸性物质,借助负离子电喷雾-傅里叶变换离子回旋共振质谱(negative-ion ESI FT-ICR MS)研究其酸性组分的组成及分布,并与工...针对某炼厂酮苯脱蜡装置原料油(减三线)中酸性物质组成特殊(对装置产生严重的腐蚀)的情况,采用碱醇法提取其中的酸性物质,借助负离子电喷雾-傅里叶变换离子回旋共振质谱(negative-ion ESI FT-ICR MS)研究其酸性组分的组成及分布,并与工业级脱脂环酸进行比较,从分子层面上揭示了其特殊之处。Negative-ion ESI FT-ICR MS结果表明,减三线酸性化合物主要的特点为O2类化合物中脂肪酸(Z=0)占明显优势,缩合度较大的Z=-8和Z=-10的O2类化合物中有些碳数的物质相对丰度也比较大,碳数分布有两个中心;O1类杂原子化合物的相对丰度仅次于O2类化合物,且大大高出其他类杂原子化合物,O1类化合物中,烷基酚类化合物占绝对优势。减三线酸性化合物的特殊组成将对进一步探究腐蚀机理和寻求解决设备腐蚀的途径有重要的指导意义。展开更多
文摘Oligodeoxynucleotide from SARS virus was selected and synthesized. Its complexes with alkaloid compounds were investigated by electrospray mass spectrometry. We found that three alkaloid compounds could interact with the DNA target molecule in five alkaloids analyzed. With increasing molar ratio of the three alkaloid compounds, the complexes between alkaloids and DNA with different stoichiometric ratios were found in their MS spectra. The order of the alkalinity of their gas phase corresponds to that of liquid phase, that is: Palmatine>Jatrorrhizine>Berberin. The relative abundance of these complexes in mass spectra can assess the relative affinities of above three alkaloid compounds with the DNA target molecule. In this paper, the binding sites between jatrorrhizine and DNA was deduced from the interaction experiments of jatrorrhizine with three nucleosides.
文摘负离子电喷雾-傅里叶变化离子回旋共振质谱仪(Neg ESI FT-ICR MS)具有超高的分辨率,可用于分析重油中杂原子化合物的组成及分布。运用Neg ESI FT-ICR MS,研究委内瑞拉奥里常渣减黏裂化反应前后杂原子化合物,建立了分子组成的解析方法。结果表明,常渣中O2类化合物的相对丰度最大,减黏产物中N1类化合物的相对丰度最大。不同缩合度,质荷比小的O2类化合物减黏裂化反应后显著增加。委内瑞拉常渣及其减黏产物中相对丰度最强的O2类化合物均是双环环烷酸。减黏裂化反应使得O2类化合物发生了裂化反应,生成碳数更少、分子质量更小的化合物。
文摘针对某炼厂酮苯脱蜡装置原料油(减三线)中酸性物质组成特殊(对装置产生严重的腐蚀)的情况,采用碱醇法提取其中的酸性物质,借助负离子电喷雾-傅里叶变换离子回旋共振质谱(negative-ion ESI FT-ICR MS)研究其酸性组分的组成及分布,并与工业级脱脂环酸进行比较,从分子层面上揭示了其特殊之处。Negative-ion ESI FT-ICR MS结果表明,减三线酸性化合物主要的特点为O2类化合物中脂肪酸(Z=0)占明显优势,缩合度较大的Z=-8和Z=-10的O2类化合物中有些碳数的物质相对丰度也比较大,碳数分布有两个中心;O1类杂原子化合物的相对丰度仅次于O2类化合物,且大大高出其他类杂原子化合物,O1类化合物中,烷基酚类化合物占绝对优势。减三线酸性化合物的特殊组成将对进一步探究腐蚀机理和寻求解决设备腐蚀的途径有重要的指导意义。