Abstract
Background: In the present paper, InfraRed (IR) spectra on water mixtures of two homologous disaccharides, i.e. sucrose and trehalose, as a function of temperature have been collected. Methods: In particular, IR spectra were registered, in the spectral range from 4000 cm-1 to 400 cm-1, to investigate the thermal response of the water mixtures of two homologous disaccharides, through positive thermal scans, i.e. by increasing the temperature from the value of 25°C to the value of 50°C. The OH-stretching region has been analyzed by means of two simple and straightforward procedures, i.e. by evaluating the shift of the intramolecular OH stretching center frequency and the Spectral Distance (SD). Result and Conclusion: Both the analyses indicate that trehalose water mixture have a higher thermal response than that of the sucrose-water mixture.
Highlights
It is well known that homologous disaccharides i. e. sucrose and trehalose have the same chemical formula (C12H22O11), they present different bio-protective properties
As far as the crossover temperature value is concerned, the value of trehalose water mixture, 37.32°C, is higher than that of sucrose water mixture, which is equal to 35.77°C. These results show that dynamics of trehalose water mixture is slower than sucrose water mixture; the trehalose has a low sensitivity to temperature changes
The aim of this work was to characterize the thermal response for two homologous disaccharides, i.e. sucrose and trehalose in water mixtures by FTIR spectroscopy
Summary
It is well known that homologous disaccharides i. e. sucrose and trehalose have the same chemical formula (C12H22O11), they present different bio-protective properties. E. sucrose and trehalose have the same chemical formula (C12H22O11), they present different bio-protective properties. Sucrose is constituted by a glucose ring in the α configuration and a fructose ring in the β configuration; the α and β structures of the same monosaccharide differ only in the orientation of the OH groups at some carbon atom in the ring itself [12 - 18]. Trehalose is a disaccharide of glucose constituted by two pyranose rings in the same configuration, linked by a glycosidic bond between the chiral carbon atoms C1 of the two rings [19 - 28]. In the present paper, InfraRed (IR) spectra on water mixtures of two homologous disaccharides, i.e. sucrose and trehalose, as a function of temperature have been collected
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