Hydration of monosaccharides studied by Raman scattering. (25th March 2018)

• Record Type: Journal Article
• Authors: Ruggiero, Ludovica; Sodo, Armida; Bruni, Fabio; Ricci, Maria Antonietta
• Other Names: Rossi Barbara guestEditor.; Masciovecchio Claudio guestEditor.
• Is Part Of: Journal of Raman spectroscopy. Volume 49:Number 6(2018)
• Page Start: 1066
• Page End: 1075
• Publication Date: 2018-03-25
• Subjects: fructose -- glucose -- hydration -- mannose -- Raman spectroscopy; Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.5351
• Languages: English
• ISSNs: 0377-0486

Abstract

Abstract: We report a Raman spectroscopy study of glucose, fructose, and mannose. The spectra have been recorded for the dry powders and for solutions in H2 O and D2 O and commented in the so‐called "fingerprint region" of the spectra (200–1, 400 cm −1 ), in order to study the influence of the interaction with water on the solute vibrational modes. We have evidenced splitting of some bands, due to the presence of different anomers in solution. The isotopic substitution of the solvent has allowed in some instances to confirm the band assignment and, in other cases, to propose new assignments. Importantly, the isotopic substitution of the solvent has evidenced differences in the interaction of the investigated monosaccharides with water, which are rationalized as due to a balance between the inertia of the oscillator due to H‐bonding and bond strength. In particular, glucose and fructose interact strongly with water, whereas in the case of mannose, we have observed a weaker interaction with water and a different behaviour of its anomers. Abstract : Three monosaccharides (glucose, fructose, and mannose) in powder and in H2 O and D2 O solutions have been studied by Raman spectroscopy. This has evidenced differences in the interaction of the three sugars with water, visible as a shift, Δ v ˜, of the band centre upon isotopic H2 O/D2 O substitution and rationalized as due to a balance between increased oscillator inertia and bond strength brought about by H‐bonding. The absolute value of Δ v ˜, increases with the Raman shift for glucose, fructose, and mannose α anomer, whereas the bands of β‐mannose do not move.