open access

https://doi.org/10.14943/lowtemsci.79.59

https://hdl.handle.net/2115/81353

Investigations on the formation and delivery of meteorite organic matter based on the carbon isotope compositions

日本語

Kinetic isotopic fractionation

2021-03-20

低温科学第79巻編集委員会

Low Temperature Science

79

59-67

The recent finding of ribose and other bio-important sugars in carbonaceous chondrites indicates that meteorites were a potential source of sugars on the prebiotic Earth. The detected sugars were enriched in 13C. This enrichment is similar to other solvent-soluble organic matter such as amino acids but distinct from terrestrial biota and meteoritic solvent-insoluble organic matter. Carbon isotope compositions record the type of formation reaction and the formation environment of the organic matter. The large difference in the carbon isotope compositions between soluble organic matter and insoluble organic matter may be formed by kinetic isotope effects through many steps of the formose reaction because a large difference in the reaction rate can be expected related to the formose reaction. In such a case, the formose reaction might significantly affect the bulk organic syntheses of the meteorite organic matter. Since meteorites contain a huge variety of organic compounds, coordinated analysis with non-target analyses and high precision target analyses such as compound-specific isotope analysis would be more important to understand the bulk organic syntheses in the early solar system and their delivery to the prebiotic Earth.

紀要論文

Version of Record

1880-7593