Urea (CH4N2O), which behaves as a solid and a molten solvent, is an important carbon and nitrogen-containing precursor molecule. Due to technical limitations, a detailed analysis of urea and a family of urea molecules by on-line mass spectrometry has been untested. In this study, we aimed to clarify the distribution of urea molecules in representative carbonaceous meteorites and performed highly accurate identification and quantification of urea molecular groups by high-performance liquid chromatography with high-resolution mass spectrometry (HPLC/HRMS) with an optimized pretreatment method. Urea and its alkyl homologues were identified in the Murchison meteorite by comparison with standards, and were detected up to a maximum carbon number of C12. These diverse urea alkyl homologues are not observed in terrestrial materials, indicating an extraterrestrial origin; the abundance of urea in the Murchison meteorite is >100 g/g (several g/g for amino acids), suggesting that urea may serve as both an organic nitrogen storage and As a storage and source of organic nitrogen, urea may have played an important role in the chemical evolution of the extraterrestrial and early Earth.
"},{"@language":"ja","@value":"固体および溶融性の溶媒としての挙動を示す尿素(CH4N2O)は、炭素・窒素を含む前駆物質として重要な分子である。これまで技術的な制約により、オンライン質量分析法による尿素および尿素分子群の詳細な解析は、未検証であった。そこで、本研究では、代表的な炭素質隕石中の尿素分子群の分布を明らかにすることを目的とし、最適化された前処理法とともに高速液体クロマトグラフ高分解能質量分析法(HPLC/HRMS)法による尿素分子群の高確度な同定・定量を行った。Murchison隕石中から、標準試料との比較によって、尿素とそのアルキル同族体を同定し、最大C12の炭素数まで検出された。これら多様な尿素アルキル同族体は地球物質では観察されないことから、地球外起源であることを示している。Murchison隕石中の尿素の存在量は、100 g/g以上であり(アミノ酸は数g/g)、有機窒素の貯蔵および供給源として、地球外および原始地球における化学進化に重要な役割を果たしたと考えられる。
"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410575751443471106","@type":"Researcher","foaf:name":[{"@language":"en","@value":"Koga Toshiki"},{"@language":"ja","@value":"古賀 俊貴"}],"jpcoar:affiliationName":[{"@language":"en","@value":"海洋研究開発機構"},{"@language":"ja","@value":"海洋研究開発機構"}]},{"@id":"https://cir.nii.ac.jp/crid/1410575751443471107","@type":"Researcher","foaf:name":[{"@language":"en","@value":"Takano Yoshinori"},{"@language":"ja","@value":"高野 淑識"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"海洋研究開発機構"},{"@language":"en","@value":"海洋研究開発機構"}]},{"@id":"https://cir.nii.ac.jp/crid/1410575751443470976","@type":"Researcher","foaf:name":[{"@language":"en","@value":"Oba Yasuhiro"},{"@language":"ja","@value":"大場 康弘"}],"jpcoar:affiliationName":[{"@language":"en","@value":"北海道大学"},{"@language":"ja","@value":"北海道大学"}]},{"@id":"https://cir.nii.ac.jp/crid/1410575751443471105","@type":"Researcher","foaf:name":[{"@language":"en","@value":"Furukawa Yoshihiro"},{"@language":"ja","@value":"古川 善博"}],"jpcoar:affiliationName":[{"@language":"en","@value":"東北大学"},{"@language":"ja","@value":"東北大学"}]},{"@id":"https://cir.nii.ac.jp/crid/1410575751443471104","@type":"Researcher","foaf:name":[{"@language":"en","@value":"Naraoka Hiroshi"},{"@language":"ja","@value":"奈良岡 浩"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"九州大学"},{"@language":"en","@value":"九州大学"}]}],"publication":{"prism:publicationName":[{"@language":"en","@value":"Abstracts of Annual Meeting of the Geochemical Society of Japan"},{"@language":"ja","@value":"日本地球化学会年会要旨集"}],"dc:publisher":[{"@language":"en","@value":"GEOCHEMICAL SOCIETY OF JAPAN"},{"@language":"ja","@value":"一般社団法人日本地球化学会"}],"prism:publicationDate":"2022","prism:volume":"69","prism:number":"0","prism:startingPage":"2"},"jpcoar:conferenceName":"2022年度日本地球化学会第69回年会講演要旨集","availableAt":"2022","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Carbonaceous%20meteorites","dc:title":"Carbonaceous meteorites"},{"@id":"https://cir.nii.ac.jp/all?q=Urea","dc:title":"Urea"},{"@id":"https://cir.nii.ac.jp/all?q=HPLC/HRMS","dc:title":"HPLC/HRMS"},{"@id":"https://cir.nii.ac.jp/all?q=Early%20Earth","dc:title":"Early Earth"},{"@id":"https://cir.nii.ac.jp/all?q=%E7%82%AD%E7%B4%A0%E8%B3%AA%E9%9A%95%E7%9F%B3","dc:title":"炭素質隕石"},{"@id":"https://cir.nii.ac.jp/all?q=%E5%B0%BF%E7%B4%A0","dc:title":"尿素"},{"@id":"https://cir.nii.ac.jp/all?q=%E9%AB%98%E9%80%9F%E6%B6%B2%E4%BD%93%E3%82%AF%E3%83%AD%E3%83%9E%E3%83%88%E3%82%B0%E3%83%A9%E3%83%95%E9%AB%98%E5%88%86%E8%A7%A3%E8%83%BD%E8%B3%AA%E9%87%8F%E5%88%86%E6%9E%90%E6%B3%95","dc:title":"高速液体クロマトグラフ高分解能質量分析法"},{"@id":"https://cir.nii.ac.jp/all?q=%E5%8E%9F%E5%A7%8B%E5%9C%B0%E7%90%83","dc:title":"原始地球"}],"dataSourceIdentifier":[{"@type":"JALC","@value":"oai:japanlinkcenter.org:2009993750"}]}