Biology – Quantitative Biology – Biomolecules
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.248m&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Biology
Quantitative Biology
Biomolecules
Scientific paper
The identification of interstellar biomolecules is a subject of great interest, as they may provide important insights into the history of the solar system and the origin of life on Earth. Amino acids have been found in Solar System bodies and meteorites. The simplest of the amino acids and the most vastly studied and searched is glycine, NH2CH2COOH. It has been demonstrated that it can be naturally formed from ultraviolet irradiation of icy interstellar analogues. Much of the information concerning astrophysical ices has been gained from observations in the infrared range, either from space or terrestrial observatories. In this context, laboratory infrared studies of amino acid molecules in different icy environments can be useful for its correct interpretation. During the last years our group has employed infrared spectroscopic techniques to characterize different ice mixtures of astrophysical interest. In this work, we have generated low temperature solid films of binary mixtures of glycine + X (X= H2O, CO2, CH4) by codepositon of both species from the vapour phase on a cold substrate at 25 K. The ice films obtained contain about 1% of glycine. Frequency shifts in the main infrared absorption bands of normal glycine were explained by the influence of the different environments. It is well known that in water solution or in its crystalline phases, glycine is present exclusively as zwitterions (+NH3CH2COO-), however in gas phase or in low-temperature inert matrices, uniquely exists in its neutral form. The proportion of neutral versus zwitterion forms of glycine in our solid mixtures and its evolution with the sample temperature, have also been investigated.
Escribano Rafel
Gálvez O.
Maté Belén
Rodriguez-Lazcano Y.
Tanarro I.
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