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Development and application of a new indicator for estimating postmortem interval using a chemical approach

Research Project

Project/Area Number 18K10117
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 58040:Forensics medicine-related
Research InstitutionHokkaido University

Principal Investigator

Jin Shigeki  北海道大学, 医学研究院, 特任助教 (60531845)

Co-Investigator(Kenkyū-buntansha) 的場 光太郎  北海道大学, 医学研究院, 講師 (00466450)
Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords死後経過時間 / 腐敗 / 酪酸 / LC-MS / チオ硫酸塩 / 硫化水素中毒 / 死後変化 / HS-GC-FID / GC-MS / LC-MS
Outline of Final Research Achievements

We analyzed body fluids from cases at various postmortem intervals and found that high concentrations of n-butyric acid were detected in samples obtained from severely decomposed cases. n-Butyric acid was detected in decomposed cases at an average concentration more than 100 and 300 times higher than in non-composed cases, in blood and urine, respectively. These results suggest that the concentration of n-butyric acid in body fluids is a useful indicator of body decomposition. On the other hand, thiosulfate, a marker of hydrogen sulfide poisoning, was detected at high concentrations in severely decomposed cases that was not hydrogen sulfide poisoning, indicating the need for caution in the diagnosis of poisoning.

Academic Significance and Societal Importance of the Research Achievements

これまで死体の腐敗の指標とされてきたのは死後産生されるエタノールと1-プロパノールの比率であったが,経験的に定められた指標に適合しない事例が多かった.これに対し,本研究で見出された酪酸については,血中および尿中濃度において腐敗と非腐敗で統計処理上有意な群間差(p <0.01)が示され,且つ群間の濃度範囲にオーバーラップも認められず指標として有用であると評価できる.また,硫化水素中毒死におけるチオ硫酸塩の濃度による鑑定では腐敗による濃度上昇に注意が必要であることが示された.

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (9 results)

All 2022 2021 2020 2019 2018

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (7 results)

  • [Journal Article] The usefulness of measuring n-butyric acid concentration as a new indicator of blood decomposition in forensic autopsy2022

    • Author(s)
      Matoba Kotaro、Murakami Manabu、Fujita Emi、Jin Shigeki、Ogasawara Ryosuke、Matoba Tomoko、Takeuchi Akiko、Haga Sanae、Ozaki Michitaka、Hyodoh Hideki
    • Journal Title

      Legal Medicine

      Volume: 57 Pages: 102071-102071

    • DOI

      10.1016/j.legalmed.2022.102071

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Sample preparation method with ultrafiltration for whole blood thiosulfate measurement2020

    • Author(s)
      Jin Shigeki、Murakami Manabu、Matoba Kotaro、Matoba Tomoko、Haga Sanae、Ozaki Michitaka、Takeuchi Akiko、Hyodoh Hideki
    • Journal Title

      Legal Medicine

      Volume: 47 Pages: 101765-101765

    • DOI

      10.1016/j.legalmed.2020.101765

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 薬毒物の迅速なスクリーニング ~探針エレクトロスプレーイオン化質量分析法を用いた分析の実際~2021

    • Author(s)
      神 繁樹,的場光太郎,兵頭秀樹
    • Organizer
      第105次日本法医学会学術全国集会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 血中チオ硫酸塩濃度の保存による変化について2020

    • Author(s)
      神 繁樹,的場光太郎,的場智子,兵頭秀樹
    • Organizer
      第104次日本法医学会学術全国集会
    • Related Report
      2020 Research-status Report
  • [Presentation] クロバエ科の蛆が薬物検査に有用であった一剖検例2020

    • Author(s)
      的場光太郎,奥谷菜穂子,神 繁樹,兵頭秀樹
    • Organizer
      第104次日本法医学会学術全国集会
    • Related Report
      2020 Research-status Report
  • [Presentation] 血液中のアルコール死後産生と酪酸濃度の関係について2020

    • Author(s)
      的場光太郎,神 繁樹,兵頭秀樹
    • Organizer
      第21回日本法医学会学術北日本地方集会
    • Related Report
      2020 Research-status Report
  • [Presentation] 血中チオ硫酸塩測定における前処理法の改良2019

    • Author(s)
      邵 旻蓉,的場光太郎,兵頭秀樹,的場智子,齋藤厚子,神 繁樹
    • Organizer
      第67回質量分析総合討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] チオ硫酸塩測定における血液サンプルの前処理の検討2019

    • Author(s)
      神 繁樹,的場光太郎,兵頭秀樹
    • Organizer
      第103次日本法医学会学術全国集会
    • Related Report
      2019 Research-status Report
  • [Presentation] LC-MS/MSによる尿および血中の酪酸の測定と死後腐敗における関係2018

    • Author(s)
      邵 旻蓉,藤田瑛美,山世真由美,兵頭秀樹,的場光太郎,神 繁樹
    • Organizer
      第24回日本質量分析学会北海道談話会・研究会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2023-01-30  

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