3. Results and discussion
3.1. Solegel transition at constant or increasing temperature
At temperatures below 30 C, gelatin macromolecules undergo a
conformation coil/helix transition (rigid form). As a result, its
aqueous colloidal solutions transforms to gels if the gelatin concentration exceeds some critical threshold (Izmailova et al., 2004;Ross-Murphy, 1997). Such a sol /gel transition happens due to
formation of intermolecular hydrogen bonds between carboxyl
oxygen and amid hydrogen in polypeptide chain (at high content of
glycineeprolineehydroxyproline amino acids). Beside, gelatin
macromolecules loss solubility at cooling owing to their transition
into the rigid helix conformation. These processes lead to phase
decomposition and formation of a spatial network structure based
on a biopolymer phase with the presence water entrapped
(Gilsenan&Ross-Murphy, 2000).
3. Results and discussion3.1. Solegel transition at constant or increasing temperatureAt temperatures below 30 C, gelatin macromolecules undergo aconformation coil/helix transition (rigid form). As a result, itsaqueous colloidal solutions transforms to gels if the gelatin concentration exceeds some critical threshold (Izmailova et al., 2004;Ross-Murphy, 1997). Such a sol /gel transition happens due toformation of intermolecular hydrogen bonds between carboxyloxygen and amid hydrogen in polypeptide chain (at high content ofglycineeprolineehydroxyproline amino acids). Beside, gelatinmacromolecules loss solubility at cooling owing to their transitioninto the rigid helix conformation. These processes lead to phasedecomposition and formation of a spatial network structure basedon a biopolymer phase with the presence water entrapped(Gilsenan&Ross-Murphy, 2000).
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