Influence of the Gelatin Amount on the Indicators of a Defrosted Fermented Milk Dessert Texture

BACKGROUND: The expansion of the range and improvement of the quality are urgent tasks in the ice cream industry. Fermented milk desserts consumed defrosted and combining the properties of ice cream and fermented products can be considered new products. The selection of stabilizer–gelling agents and determination of their mass fraction are important stages in the development of the fermented milk dessert technology. Among them, gelatin is the most effective and convenient.

AIM: The object of this study is to examine the effect of the gelatin amount on the structure and texture of defrosted fermented milk desserts.

MATERIALS AND METHODS: Samples of desserts with a mass fraction of gelatin from 1,3 to 1,9% are the objects of this study. Rheological research methods for estimating the dynamic viscosity and indicators of consistency were used. The dispersion of the air phase of frozen samples and after storing at the temperature of 4±2°С for 4 hours has been estimated.

RESULTS: The dispersion of the air phase and texture characteristics, such as hardness, adhesiveness, adhesive force, apparent modulus, and recoverable deformation, were examined during the research. The research results show that increasing the gelatin amount did not influence the viscosity but decreased the overrun. Increasing the gelatin amount did not influence the average size of air bubbles after 4 h of storage. The influence of the gelatin amount on the texture indicators of the defrosted dessert was estimated. Adhesiveness and adhesive force with the increase in the gelatin amount by 0.3% were reduced by 16% and 9–12%, respectively. The obtained results have practical importance in the production and sale of defrosted fermented milk desserts.