Structure, molecular dynamics, and interactions in aqueous xylitol solutions

Abstract

Broad-band dielectric relaxation studies of xylitol-water mixture show distinctly different dynamics for distal and central –OH of xylitol molecules and indicates the presence of loose xylitol aggregates.

Influence of intramolecular dynamics on the relaxation spectra of simple liquids

“…Besides the above mentioned work, there exists a large body of dielectric as well as light scattering studies that analyze high frequency spectra in detail, [23][24][25][26][27][28][29] where most of the studies use a similar analysis approach combining several relaxation and damped oscillator models, often using more than 4 model functions. In particular when the liquids are cooled to the point where the main relaxation peak shifts out of the frequency window of the used methods, 13,14,19,20,[30][31][32] the full complexity of the high frequency dynamics is revealed and a minimum between the main relaxation peak and the microscopic peak is observed.…”

Temperature-Dependent Dielectric Relaxation Measurements of (Betaine + Urea + Water) Deep Eutectic Solvent in Hz-GHz Frequency Window: Microscopic Insights into Constituent Contributions and Relaxation Mechanisms

“…In addition, previous DR measurements of molten urea reported a small relaxation component (∼6%) with a time constant of ∼5 ps. DR measurements of an aqueous solutions of xylitol − and ionic acetamide deep eutectics , also found similar time scales. Considering that extensive interspecies H-bond interactions govern the liquid phase structure of the present NADES and the previously studied systems, ,,− detection of a fast relaxation component with time constant of ∼5 ps for this DES is probably expected.…”

“…DR measurements of an aqueous solutions of xylitol − and ionic acetamide deep eutectics , also found similar time scales. Considering that extensive interspecies H-bond interactions govern the liquid phase structure of the present NADES and the previously studied systems, ,,− detection of a fast relaxation component with time constant of ∼5 ps for this DES is probably expected. Detection of relaxation processes faster than this is severely limited by the frequency window of the present measurement setup and this is reflected in the large undetected portion shown by ε ∞ − n D 2 values in Table .…”

A method for measuring dielectric relaxation of water by NIR spectroscopy: Applicability and application to measurement of water diffusion coefficient

“…Identical NIR spectra also lead to close Δ E HB and τ IR , as well as the large discrepancy between τ IR and τ DS of the two chain sugar alcohols. The discrepancy might be due to the improper identification of τ DS , as Bucher et al pointed out that aqueous xylitol contributes to the dielectric loss at the range of 0.1–100 GHz as well (Płowaś‐Korus & Buchner, 2019, 2021), which makes it difficult to identify the water contribution. This also helps to explain why sorbitol solutions have higher main peak height than that of glucose and maltitol in dielectric spectrum, as discussed above.…”