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  • 1 University of Trieste Dep. of Biochemistry, Biophysics and Macromolecular Chemistry Via Giorgeri 1 I-34127 Trieste Italy Via Giorgeri 1 I-34127 Trieste Italy
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Abstract  

A DSC study has been carried out on isomalt, a commercial sugar alcohol derived from sucrose and widely used as a sweetener in the food industry. Isomalt is a mixture of two isomers:α-D-glucopyranosyl–1-6-mannitol (GPM) and α-D-glucopyranosyl–1-6-sorbitol (GPS). Release of the water of crystallisation (around 100C)and melting (around 150C) have been phenomenologically characterised using different scanning rates and heat treatments. The effect of dehydration/re-hydration on the melting has been investigated. The isomalt glass transition, at about 60C, was studied on samples cooled after melting. The dynamic aspect of structural relaxation of isomalt has been quantified by its fragility parameter. Glassy state stability has been evaluated by performing ageing experiments at sub-Tg temperatures. During ageing, apart from the expected enthalpy relaxation effects, isomalt showed a peculiar behaviour, due to its isomeric composition. These preliminary and phenomenological results have been interpreted in terms of isomer structure and of carbohydrate-water interactions in the mixture.

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  • Impact Factor (2019): 2.731
  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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