A problem in chemical analysis in connection with measurements of a substance normally occurring in a sample, or identification of a substance which should not exist in a sample, is insufficient selectivity. In this a...A problem in chemical analysis in connection with measurements of a substance normally occurring in a sample, or identification of a substance which should not exist in a sample, is insufficient selectivity. In this article, we analyze this problem and propose remedies. We use a real doping case to illustrate how chemical noise causes a serious selectivity problem, probably causing a false positive outcome.展开更多
In this study, seawater was pumped up from 150, 200, 300, 500 and 1000 m in the South China Sea and analyzed to make certain what depth should deep-sea water (DSW) be pumped up for medicinal usage. The pumping depth o...In this study, seawater was pumped up from 150, 200, 300, 500 and 1000 m in the South China Sea and analyzed to make certain what depth should deep-sea water (DSW) be pumped up for medicinal usage. The pumping depth of DSW was determined on the basis of chemical ingredients. The analyses of inorganic elements and dissolved organic matter (DOM) were performed by inductively coupled plasma mass spectrometry (ICP-MS) and ultra performance liquid chromatography-mass spectrometry (UPLC-MS) respectively. The raw data were used for hierarchical cluster analysis (HCA) and principal component analysis (PCA). The results showed that seawater pumped up from 500 m and 1000 m was similar in their chemical ingredients, and was different from the seawater pumped up from other depths. These results indicated that seawater from more than 500 m depth had relatively stable chemical ingredients and could be used as DSW in the South China Sea.展开更多
目的:基于现代检测技术对怀牛膝有效制剂——牛膝醇提物的单体成分进行定性定量分析。方法:将怀牛膝醇提物液体制剂按照检测进样要求分别制备成烘干物和液体物,再应用核磁共振波谱(Nuclear Magnetic Resonance,NMR)、气相色谱质谱联用(G...目的:基于现代检测技术对怀牛膝有效制剂——牛膝醇提物的单体成分进行定性定量分析。方法:将怀牛膝醇提物液体制剂按照检测进样要求分别制备成烘干物和液体物,再应用核磁共振波谱(Nuclear Magnetic Resonance,NMR)、气相色谱质谱联用(Gas Chromatography-Mass Spectrometry,GC-MS)、顶空-气相色谱质谱联用(Headspace-Gas Chromatography-Mass Spectrometry,HS-GCMS)、液相色谱质谱联用(Liquid Chromatography-Mass Spectrometry,LC-MS)、三重串联四极杆液相质谱联用(Triple Series Quadrupole Liquid Mass Spectrometry,LC-MSMS)等技术对牛膝醇提物的化学成分进行鉴定分析。结果:共检测出23个单体成分,包括糖类1个,类黄酮类1个,黄酮类1个,甾酮类1个,三萜类1个,氨基酸类16个,果酸类2个,其中槲皮素含量为0.0021%,β-蜕皮甾酮含量为0.0210%,齐墩果酸含量为0.00017%,并根据分子片段信息预测出了4’,5,6,7-四甲氧基黄酮成分。结论:本实验为怀牛膝醇提物制剂的临床应用提供了有效单体成分参考,为进一步对其单体物质的“药物-疾病-靶点”进行验证研究和开发应用提供依据。展开更多
文摘A problem in chemical analysis in connection with measurements of a substance normally occurring in a sample, or identification of a substance which should not exist in a sample, is insufficient selectivity. In this article, we analyze this problem and propose remedies. We use a real doping case to illustrate how chemical noise causes a serious selectivity problem, probably causing a false positive outcome.
基金supported by Special Fund for Marine Scientific Research in the Public Interest (2010-05024)
文摘In this study, seawater was pumped up from 150, 200, 300, 500 and 1000 m in the South China Sea and analyzed to make certain what depth should deep-sea water (DSW) be pumped up for medicinal usage. The pumping depth of DSW was determined on the basis of chemical ingredients. The analyses of inorganic elements and dissolved organic matter (DOM) were performed by inductively coupled plasma mass spectrometry (ICP-MS) and ultra performance liquid chromatography-mass spectrometry (UPLC-MS) respectively. The raw data were used for hierarchical cluster analysis (HCA) and principal component analysis (PCA). The results showed that seawater pumped up from 500 m and 1000 m was similar in their chemical ingredients, and was different from the seawater pumped up from other depths. These results indicated that seawater from more than 500 m depth had relatively stable chemical ingredients and could be used as DSW in the South China Sea.
文摘目的:基于现代检测技术对怀牛膝有效制剂——牛膝醇提物的单体成分进行定性定量分析。方法:将怀牛膝醇提物液体制剂按照检测进样要求分别制备成烘干物和液体物,再应用核磁共振波谱(Nuclear Magnetic Resonance,NMR)、气相色谱质谱联用(Gas Chromatography-Mass Spectrometry,GC-MS)、顶空-气相色谱质谱联用(Headspace-Gas Chromatography-Mass Spectrometry,HS-GCMS)、液相色谱质谱联用(Liquid Chromatography-Mass Spectrometry,LC-MS)、三重串联四极杆液相质谱联用(Triple Series Quadrupole Liquid Mass Spectrometry,LC-MSMS)等技术对牛膝醇提物的化学成分进行鉴定分析。结果:共检测出23个单体成分,包括糖类1个,类黄酮类1个,黄酮类1个,甾酮类1个,三萜类1个,氨基酸类16个,果酸类2个,其中槲皮素含量为0.0021%,β-蜕皮甾酮含量为0.0210%,齐墩果酸含量为0.00017%,并根据分子片段信息预测出了4’,5,6,7-四甲氧基黄酮成分。结论:本实验为怀牛膝醇提物制剂的临床应用提供了有效单体成分参考,为进一步对其单体物质的“药物-疾病-靶点”进行验证研究和开发应用提供依据。
