同位体による有機化合物イオンの組成決定

概要

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The previously reported technique for determination of elemental compositions of organic ions are improved in that both mass differences and relative intensity ratios of accompanying isotopic peaks are examined. As an example, a peak at m/e 94(peak a)of 2-aminopyridine is selected. The observed mass difference(Table1)of two isotopic peaks at m/e 95(peak b and c)suggested that the peak a contains N or both N and O(Table2). However, comparisons of the observed and calculated mass differences and intensity ratios of two peaks at m/e 96(peak d and e)showed that peak a should not contain oxygen atoms(Table 3). We have therefore four possible combinations for peak a at m/e 94. The choice of the correct elemental composition C, H, N, is based on the fact that the observed intensity ratios b:c, a:c, and c:e are all in good agreement with calculated values(Table 4). Some technical features of the present method are also discussed.
日本質量分析学会の論文