The influence of temperature in the production of intermediate compounds of acid degradation of D-glucose
DOI:
https://doi.org/10.18372/2306-6407.2.14279Keywords:
D-glucose, degradation, temperature scale, acid medium, early stages, intermediate unsaturated carbonyl-containing compounds, intermediate carbonyl-containing compounds, Raman spectroscopy, UV-spectroscopyAbstract
In the paper there is considered the question of the influence of temperature on the course of the early stages of degradation D-glucose in aqueous solutions in pH range 1,0–7,0. By Raman spectroscopy there is demonstrated that within the temperature limits of 20–95 °C a change in the concentration of intermediate carbonyl-containing compounds (V 1740–1710 cm-1) is observed, which suggests a certain sequence of transformations of the early stages of degradation D-glucose. By UV-spectroscopy there is demonstrated that the formation of intermediates of the early stages of degradation D-glucose [unsaturated carbonyl-containing compounds, including unsaturated ozone (Lambda(max) 225 nm) and carbonyl-containing compounds (Lambda(max) 285 nm )] increases rapidly within the temperature limits of 80–95 °C in pH range 1,0–7,0. It has been shown that, all processes of the early stages of acid degradation D-glucose are slowed down at pH 3.0 within the limits of given temperatures.References
Ab initio molecular dynamics simulations of β-D-glucose and β-D-xylose degradation mechanisms in acidic aqueous solution / [Qian X., Nimlos M.R., Davis M. et al.] // Carbohydrate research. – 2005. – Vol. 340, Is. 14. – P. 2319–2327. https://doi.org/10.1016/j.carres.2005.07.021
Lü X. New insights on monosaccharides’ isomerization, dehydration and fragmentation in hot-compressed water / Lü X., Saka S. // The Journal of Supercritical Fluids. – 2012. – Vol. 61. – P. 146–156. https://doi.org/10.1016/j.supflu.2011.09.005
Azofra L.M. Theoretical study of the mutarotation of erythrose and threose: acid catalysis / Azofra L.M., Alkorta I., Elguero J. // Carbohydrate research. – 2013. – Vol. 372. – P. 1–8. https://doi.org/10.1016/j.carres.2013.01.013