[M-TT42_2AM2] 地球化学の最前線：先端的手法から探る地球像

★ [MTT42-11] 有機物から最大限の情報を引き出すために

*大河内 直彦¹、力石 嘉人¹、高野 淑識¹、小川 奈々子¹ (1.海洋研究開発機構)

キーワード：有機分子, 同位体比, 窒素, 炭素

Molecular isotopic record in either organisms or sediments has been proven useful for better understanding the bio(geo)chemical processes, reconstructing paleo-environment, etc. During the last decades, target molecules have been expanding from simple lipids to complex physiologically active compounds. There are two key issues to push this molecular tool more useful and more efficient: 1) Purity of the target compounds that are extracted from environmental samples (generally a complex mixture of organic compounds), and 2) sensitivity of isotope-ratio mass spectrometry (IRMS) system for precisely measuring isotopic compositions. In this presentation we will overview the recent advances in these two issues, and how these achievements contributed to the progresses in our knowledge. We also try to mention in the future challenges of molecular isotopic signatures.