Glycolaldehyde is the organic compound with the formula HOCH2−CHO. It is the smallest possible molecule that contains both an aldehyde group (−CH=O) and a hydroxyl group (−OH). It is a highly reactive molecule that occurs both in the biosphere and in the interstellar medium. It is normally supplied as a white solid. Although it conforms to the general formula for carbohydrates, Cn(H2O)n, it is not generally considered to be a saccharide.[1]
Structure
Glycolaldehyde as a gas is a simple monomeric structure. As a solid and molten liquid, it exists as a dimer. Collins and George reported the equilibrium of glycolaldehyde in water by using NMR.[2][3] In aqueous solution, it exists as a mixture of at least four species, which rapidly interconvert.[4]
Structures and distribution of glycolaldehyde as a 20% solution in water. Notice that the free aldehyde is a minor component.
In acidic or basic solution, the compound undergoes reversible tautomerization to form 1,2-dihydroxyethene.[5]
It is the only possible diose, a 2-carbon monosaccharide, although a diose is not strictly a saccharide. While not a true sugar, it is the simplest sugar-related molecule.[6] It is reported to taste sweet.[7]
Synthesis
Glycolaldehyde is the second most abundant compound formed when preparing pyrolysis oil (up to 10% by weight).[8]
Glycolaldehyde is an intermediate in the formose reaction. In the formose reaction, two formaldehyde molecules condense to make glycolaldehyde. Glycolaldehyde then is converted to glyceraldehyde, presumably via initial tautomerization.[10] The presence of this glycolaldehyde in this reaction demonstrates how it might play an important role in the formation of the chemical building blocks of life. Nucleotides, for example, rely on the formose reaction to attain its sugar unit. Nucleotides are essential for life, because they compose the genetic information and coding for life.
Theorized role in abiogenesis
It is often invoked in theories of abiogenesis.[11][12] In the laboratory, it can be converted to amino acids[13] and short dipeptides[14] may have facilitated the formation of complex sugars. For example, L-valyl-L-valine was used as a catalyst to form tetroses from glycolaldehyde. Theoretical calculations have additionally shown the feasibility of dipeptide-catalyzed synthesis of pentoses.[15] This formation showed stereospecific, catalytic synthesis of D-ribose, the only naturally occurring enantiomer of ribose. Since the detection of this organic compound, many theories have been developed related various chemical routes to explain its formation in stellar systems.
It was found that UV-irradiation of methanol ices containing CO yielded organic compounds such as glycolaldehyde and methyl formate, the more abundant isomer of glycolaldehyde. The abundances of the products slightly disagree with the observed values found in IRAS 16293-2422, but this can be accounted for by temperature changes. Ethylene Glycol and glycolaldehyde require temperatures above 30 K.[16][17] The general consensus among the astrochemistry research community is in favor of the grain surface reaction hypothesis. However, some scientists believe the reaction occurs within denser and colder parts of the core. The dense core will not allow for irradiation as stated before. This change will completely alter the reaction forming glycolaldehyde.[18]
Artistic depiction of sugar molecules in the gas surrounding a young Sun-like star.[19]
The different conditions studied indicate how problematic it could be to study chemical systems that are light-years away. The conditions for the formation of glycolaldehyde are still unclear. At this time, the most consistent formation reactions seems to be on the surface of ice in cosmic dust.
Glycolaldehyde has been identified in gas and dust near the center of the Milky Way galaxy,[20] in a star-forming region 26000 light-years from Earth,[21] and around a protostellar binary star, IRAS 16293-2422, 400 light years from Earth.[22][23] Observation of in-falling glycolaldehyde spectra 60 AU from IRAS 16293-2422 suggests that complex organic molecules may form in stellar systems prior to the formation of planets, eventually arriving on young planets early in their formation.[17]
Detection in space
The interior region of a dust cloud is known to be relatively cold. With temperatures as cold as 4 Kelvin the gases within the cloud will freeze and fasten themselves to the dust, which provides the reaction conditions conducive for the formation of complex molecules such as glycolaldehyde. When a star has formed from the dust cloud, the temperature within the core will increase. This will cause the molecules on the dust to evaporate and be released. The molecule will emit radio waves that can be detected and analyzed. The Atacama Large Millimeter/submillimeter Array (ALMA) first detected glycolaldehyde. ALMA consists of 66 antennas that can detect the radio waves emitted from cosmic dust.[24]
On October 23, 2015, researchers at the Paris Observatory announced the discovery of glycolaldehyde and ethyl alcohol on Comet Lovejoy, the first such identification of these substances in a comet.[25][26]
References
^Mathews, Christopher K. (2000). Biochemistry. Van Holde, K. E. (Kensal Edward), 1928-, Ahern, Kevin G. (3rd ed.). San Francisco, Calif.: Benjamin Cummings. p. 280. ISBN978-0805330663. OCLC42290721.
^Collins, G. C. S.; George, W. O. (1971). "Nuclear magnetic resonance spectra of glycolaldehyde". Journal of the Chemical Society B: Physical Organic: 1352. doi:10.1039/j29710001352. ISSN0045-6470.
^Yaylayan, Varoujan A.; Harty-Majors, Susan; Ismail, Ashraf A. (1998). "Investigation of the mechanism of dissociation of glycolaldehyde dimer (2,5-dihydroxy-1,4-dioxane) by FTIR spectroscopy". Carbohydrate Research. 309: 31–38. doi:10.1016/S0008-6215(98)00129-3.
^Fedoroňko, Michal; Temkovic, Peter; Königstein, Josef; Kováčik, Vladimir; Tvaroška, Igor (1 December 1980). "Study of the kinetics and mechanism of the acid-base-catalyzed enolization of hydroxyacetaldehyde and methoxyacetaldehyde". Carbohydrate Research. 87 (1): 35–50. doi:10.1016/S0008-6215(00)85189-7.
^Moha, Dinesh; Charles U. Pittman, Jr.; Philip H. Steele (10 March 2006). "Pyrolysis of Wood/Biomass for Bio-oil: A Critical Review". Energy & Fuels. 206 (3): 848–889. doi:10.1021/ef0502397. S2CID49239384.
^((Hans Peter Latscha, Uli Kazmaier und Helmut Alfons Klein : Organic Chemistry: Chemistry Basiswissen-II '. Springer, Berlin; 6, vollständig überarbeitete Auflage 2008, ISBN978-3-540-77106-7, S. 217))
^Kleimeier, N. Fabian; Eckhardt, André K.; Kaiser, Ralf I. (August 18, 2021). "Identification of Glycolaldehyde Enol (HOHC═CHOH) in Interstellar Analogue Ices". J. Am. Chem. Soc. 143 (34): 14009–14018. doi:10.1021/jacs.1c07978. PMID34407613. S2CID237215450.((cite journal)): CS1 maint: date and year (link)
^Kim, H.; Ricardo, A.; Illangkoon, H. I.; Kim, M. J.; Carrigan, M. A.; Frye, F.; Benner, S. A. (2011). "Synthesis of Carbohydrates in Mineral-Guided Prebiotic Cycles". Journal of the American Chemical Society. 133 (24)): 9457–9468. doi:10.1021/ja201769f. PMID21553892.
^Benner, S. A.; Kim, H.; Carrigan, M. A. (2012). "Asphalt, Water, and the Prebiotic Synthesis of Ribose, Ribonucleosides, and RNA". Accounts of Chemical Research. 45 (12): 2025–2034. doi:10.1021/ar200332w. PMID22455515. S2CID10581856.
^Cantillo, D.; Ávalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C. (2012). "On the Prebiotic Synthesis of D-Sugars Catalyzed by L-Peptides Assessments from First-Principles Calculations". Chemistry: A European Journal. 18 (28): 8795–8799. doi:10.1002/chem.201200466. PMID22689139.
