The Effect of the Thermal History on the Gelation of Gelatin solution

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Abstract
We have studied the effect of the thermal history on the gelation of an aqueous solution of gelatin by differential scanning calorimetry (DSC). DSC has shown that the heat affusion and the melting point of gelatin gels are related to the maturing temperature. An experimental study of the structure of gelatin gels by wide angle X-ray diffraction (WAXD) is described. Some workers have reported that the presence of a crystalline structure was not seen in the WAXD pattern of gelatin gels containing a high amount of water, therefore, we made gelatin gels at several fixed temperatures and dried them at the same temperatures. The gelatin films made under such controlled temperature conditions were used as the samples for WAXD determination. The gelatin film gelled and dried at a higher temperature had a lower content of triple-helices but denser bundles of the triple helices in the junction zone than the gelatin film made at a lower temperature. The heat offusion and the melting point of gelatin gels obtained by DSC can be explained on the basis of the results concerning the structures of gelatin films obtained by WAXD.

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