Pizzarello, Sandra; Wang, Yi; Chaban, Galina M. published the artcile< A comparative study of the hydroxy acids from the Murchison, GRA 95229 and LAP 02342 meteorites>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is hydroxy acid carbonaceous chondrite aqueous extract GC MS; chirality hydroxy acid carbonaceous chondrite; carbon isotope hydroxy acid carbonaceous chondrite; atomic deuterium hydroxy acid carbonaceous chondrite.
The hydroxy acid suites extracted from the Murchison (MN), GRA 95229 (GRA) and LAP 02342 (LAP) meteorites have been investigated for their mol., chiral and isotopic composition Substantial amounts of the compounds have been detected in all three meteorites, with a total abundance that is lower than that of the amino acids in the same stones. Overall, their mol. distributions mirror closely that of the corresponding amino acids and most evidently so for the LAP meteorite. A surprising L-lactic acid enantiomeric excess was found present in all three stones, which cannot be easily accounted by terrestrial contamination; all other compounds of the three hydroxy acid suites were found racemic. The branched-chain five carbon and the diastereomer six-carbon hydroxy acids were also studied vis-a-vis the corresponding amino acids and calculated ab initio thermodn. data, with the comparison allowing the suggestion that meteoritic hydroxy acid at these chain lengths formed under thermodn. control and, possibly, at a later stage than the corresponding amino acids. 13C and D isotopic enrichments were detected for many of the meteoritic hydroxy acids and found to vary between mol. species with trends that also appear to correlate to those of amino acids; the highest δD value (+3450‰) was displayed by GRA 2-OH-2-methylbutyric acid. The data suggest that, while the amino- and hydroxy acids likely relate to common presolar precursor, their final distribution in meteorites was determined to large extent by the overall composition of the environments that saw their formation, with ammonia being the determining factor in their final abundance ratios.
Geochimica et Cosmochimica Acta published new progress about Amino acids Role: GOC (Geological or Astronomical Occurrence), GPR (Geological or Astronomical Process), OCCU (Occurrence), PROC (Process). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics