:Challge of ultrasonic absorption in process of thermoreversible sol-geltransformation of aquerous solution of gelatin containing saccharose

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The change in absorption of ultrasonic waves on thermoreversible sol-gel transformation of aqueous of gelatin containing saccharose was measured using an apparatus of pulsed ultrasonic absorption on the fixed path method. Gelation point of the aqueous solutions of gelatin occurs in rapid and slow rates of cooling, the value being lower in the former caso than in the latter. Rheological properties of the gelatin hydrogels containing saccharose and glucose were studied with the stress relaxation curves obtained by means of a chainomatic balance relaxometer. Concentration of gelatin in the specimen gels was 11.4%, and saccharoseor glucose was added to those gels within 0-1.2mol/l and 0-2.5mol/l, respectively. The elastic modulus, E1, in the six-element mechanical model increased with increasing concentration of glucose and saccharose. Magnitude of E1 of the gelatin hydrogels containing saccharose was greater than that of glucose. The rheological behavior of the gelatin gels containing saccharose and glucose may be explained from the view point of the hydrogen bond between the sugars and water.
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