The influence of hydrogen-ion concentration on the production of intermediate compounds in degradation reaction of D-giucose
DOI:
https://doi.org/10.18372/2306-6407.2.13213Keywords:
D-glucose, degradation, acidic medium, early stages, intermediates, UV-spectroscopyAbstract
In the paper there is considered the question of the influence of hydrogen-ions concentration on the formation of intermediates (unsaturated carbonyl-containing compounds with Lambdamax225 nm and carbonyl-containing compounds with Lambdamax285 nm) of the early stages of degradation D-glucose in aqueous solutions in pH range 1,0–7,0. By UV-spectroscopy there is demonstrated that an increase in hydrogen-ions concentration slows the formation of basic intermediates of the early stages, but it accelerates the transformation of unsaturated carbonyl-containing intermediates (Lambdamax225 nm) to 5-hydroxymethylfurfural. It was shown that reactions of the formation of unsaturated carbonyl-containing compounds, as starting intermediates for further transformations, slowed down at pH 3, indicating a certain stability of D-glucose under these conditions.
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