ISSN:
1572-8943
Keywords:
apple sugars and pectins
;
frozen water
;
glass transition
;
state diagram
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The dependence of phase transitions in apple systems at several different water contents has been studied by using differential scanning calorimetry (DSC). The pre-cooled samples with high water fractions show a small but distinct thermal effect at low temperature before the final melting of the ice. The samples with low water content show a second order type transition, characterised by a temperature which increases with decreasing water content. The temperature/composition behaviour is reported in the form of the so-called 'supplemented' state diagram, including the solid/liquid coexistence boundaries and the extrapolated glass transition curve. This diagram contributes towards understanding the transformations encountered during the temperature process of partially dried samples of apple. An interpretation is presented about the existence of phase-segregated regions, which could give the observed thermal effects at low temperatures.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1010148913394
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