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本文通过对烯烃和烷基环己烷的质谱六个特征参数的综合分析(计算它们之间的相似系数和建立十六个化合物的模糊相似矩阵),提出用模糊编网法鉴别烯烃和烷基环己烷质谱的方法。 相似文献
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由于不饱和化合物的双键在质谱测定中发生位移,导致双键位置异构体的质谱非常相似,并且质谱中离子的强度随测定条件的变化在一定范围内变动。从某种意义上说,双键位置异构体的质谱具有一定的模糊性。到目前为止,还很难用质谱方法直接区别双键位置异构体。本研究组通过对脂肪族不饱和醇及乙酸酯质谱的研究,建立了相似分析/质谱法鉴定昆虫性信息素双键位置的方法。本文应用这种方法鉴别了十四碳共轭二烯-1-醇的10个双键位置异构体。HO-(CH2)n-CH=CH-CH=CH-(CH2)m-H1相似分析方法通过对10个异构体… 相似文献
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采用电喷射离子化(ESI)串联质谱仪对新型寡聚酰胺类的质谱碎裂机理进行了研究。结果表明.新型寡聚酰胺类的主要碎裂模式是C—CO键,CO-NH键和NH-C键的断裂及氢原子重排产生的。 相似文献
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本文系统报△2~△11-十二碳单烯-1-乙酸酯的甲烷-化学电离质谱的特征,并结合子离子谱讨论此类双键位置异构体的碎裂方式。 相似文献
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For Bcl-2, VEGF, c-Myc oncogene promoter, we directly observed that the G-rich sequences preferentially adopt G-quadruplex structures by ESI-MS. And the non-covalent interaction of the G-quadruplexes and 34 small molecules was investigated. The dimeric G-quadruplex structures of HIV-1 IN inhibitors were detected by ESI-MS for the first time. We observed the specific binding of a perylene derivative, which could shift the equilibrium to the dimeric G-quadruplex, while the polyamide induced a structural change to the intramolecular one. 相似文献
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The discrimination of four pairs of cyclic peptide diastereomers were successfully achieved by ESI-MS. The ratio of ions’ abundance ratios between A and B isomers in MS/MS spectra was defined as a parameter(rA, B) for discriminating diastereomers. All the four rA, B values deviates far from 1, which demonstrates excellent discrimination of the four pairs of diastereomers. The diverse spectral behaviors of CP1-CP6 was found attributing to ‘mobile proton’ transfer diversities and steric hindrance at fragmentation sub-surrounding due to chiral differences. MSn spectra illustrate that both CP7 and CP8 fragment through bx-yz and a1-yx ring-opening mechanisms and their chiral differences result in the predilection of the two ring-opening modes. 相似文献
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