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Molecular dynamics in dehydrated starch gels

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Poliszko S., Napierala D. M., Rezler R., Hoffmann G.

Żywność Nauka Technologia Jakość. Suplement

2002

tom 09

nr 4

We have recently developed a transformation method for representation of different relaxation processes data (DMTA, DETA and 1H-NMR) as a function of free energy of activation in freeze-dried wheat starch gel. In our previous paper [12] the method of transformation was applied for freeze-dried wheat starch gel of density of 0.13 g/cm3, while in this paper we present results of a similar analysis of relaxation parameters measured in a wide temperature range in dehydrated wheat starch gel of a twice lower density. In the system studied, we observed a decreasing value of the complex rigidity modulus, due to much lower degree of crosslinking. Similar courses of dispersion profile obtained with 1H-NMR relaxation method and DMTA method, at temperature ranging from 100 to 380 K, point to a correlation between the nuclear and mechanical relaxation processes, confirming the results of our previous work, which are related to the dynamics of hydroxymethylene groups in freeze-dried starch gel.

Ograniczanie wyników

1 Żywność Nauka Technologia Jakość. Suplement

1 Hoffmann G.

1 Napierala D. M.

1 Poliszko S.

1 Rezler R.

1 2002

Wyniki wyszukiwania

Molecular dynamics in dehydrated starch gels