著者

大森 毅 組橋 充 遠堂 郁 中澤 寛子 竹川 健一 内川 貴志 瀬戸 康雄

出版者

日本法科学技術学会

雑誌

日本法科学技術学会誌 (ISSN:18801323)

巻号頁・発行日

vol.23, no.2, pp.91-101, 2018

被引用文献数

1

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&emsp;We performed comparative investigation in visible-spectrophotometric methods for determining carboxyhemoglobin (CO-Hb) in blood samples. About 58% carboxyhemoglobin-saturation (%CO-Hb) of blood samples (sample H) was prepared from control blood by carbon monoxide bubbling and this sample was diluted to be 4/11 and 3/25 with control human blood to prepare moderate and weak CO-Hb saturated samples (sample M and L, respectively). We measured %CO-Hb of four samples, samples H, M, L and control human blood (relative %CO-Hb were 1.00, 0.36, 0.12 and 0, respectively), by four different methods in five different forensic science laboratories. By summing up the measurement results, the method (1), which is described in &ldquo;Standard method of chemical analysis in poisoning (edited by the Pharmaceutical Society of Japan)&rdquo;, gave %CO-Hb values that reflected the relative %CO-Hb of the four samples. The method (2), which is an isosbestic point method (developed by Department of Forensic Medicine, Kagawa University) gave higher values compared to the expected ones. The method (3), which is performed with a strong alkaline condition, gave higher values for low %CO-Hb samples by Katsumata's formula (method (3)-1). But the values calculated using the formula improved by Forensic Science Laboratory, Hokkaido Prefectural Police H.Q. (method (3)-2), gave the values reflecting the relative %CO-Hb. The method (4), which is also performed with a strong alkaline method, gave values which reflected the relative %CO-Hb when the Fukui's formula was used for calculation. But the formula modified by Aoki (method (4)-2) gave higher values for the blood samples of low %CO-Hb. In comparison of the three methods that gave the values reflecting the relative %CO-Hb, the method (1) and (3)-2 gave similar values but the measured values obtained by method (4)-1 was lower than the values obtained by method (1) and (3)-2. On the other hand, the method (3)-2 and method (1) showed the large dispersion in the measured values among the laboratories, but the dispersion by the method (4)-1 was small.<br>

著者

春田 祐輔 森田 敦 大槻 光彦 中園 陽子 中山 秀幸 八ヶ代 一郎 内川 貴志

出版者

日本法科学技術学会

雑誌

日本法科学技術学会誌 (ISSN:18801323)

巻号頁・発行日

vol.22, no.2, pp.123-132, 2017 (Released:2017-07-27)

参考文献数

12

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Several synthetic cannabinoids such as AM-2201 contain the 3-carbonyl-N-fluoropentylindole structure. This structure has fluorine positional isomers on the alkyl chain. In most cases, legal controls are placed only on the 5-fluoro analogue. Thus, differentiation of isomers is a significant issue in forensic science. In this study, we developed a method for the differentiation of positional isomers of 3-carbonyl-N-fluoropentylindole derivatives utilizing multiple-stage mass spectrometry using an ion trap tandem mass spectrometer. In addition, the analogues whose fluorine atom was replaced with a chlorine atom or hydroxyl group were also examined.  With respect to each positional isomer of fluorine and chlorine, the ion at m/z 232 or m/z 248, obtained by MS2 analysis of [M+H]+, were selected as the precursor ions for MS3 analysis. The ion at m/z 232 and m/z 248 corresponded to the 3-carbonyl-N-fluoropentylindole and 3-carbonyl-N-chloropentylindole structures. Furthermore, the ion at m/z 212, corresponding to the de-halogenated fragments of the 3-carbonyl-N-fluoropentylindole- and 3-carbonyl-N-chloropentylindole-structures, was selected as the precursor ion for MS4 analysis. Consequently, combination of these MSn analysis achieved differentiation of all the positional isomers.  With respect to positional isomers with the hydroxyl group, however, the fragment ion at m/z 212 was not observed from the MS3 analysis of m/z 230, which corresponds to the 3-carbonyl-N-fluoropentylindole structure. Therefore, differentiation of each positional isomer was not achieved by MSn analysis.  This method is useful for the differentiation of positional isomers of 3-carbonyl-N-fluoropentylindole and 3-carbonyl-N-chloropentylindole derivatives.