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SU, Fernando. Structural behavior of ice creams formulations varying the fat base. São Paulo, 2012. 114p. Master’s dissertation – Pharmaceutical Sciences College. University of São Paulo. Fat is responsible for several characteristics of ice cream and the formation and its structure depends on the production process. Replacing the fat base should be made with knowledge of the transformations that it undergoes during processing. The addition of functional ingredients may add benefits to the food. The tropical fruit longan is well known in Asian countries, with their sweet and juicy pulp containing many minerals, vitamins and substances beneficial to health. This project suggests the development of ice cream formulations varying the fat base and the addition of longan fruit as a functional ingredient. The oscillatory rheology was chosen as the main tool to study the changes occurring in the structure of ice cream mixtures due to variation of the type of fat used, and evaluate low trans fat, palm fat and cupuassu fat as substitutes for the hydrogenated fat. The formulation with palm fat showed the greatest differences among the fats used in the process of ageing and weaker structure according to the rheology analysis. It also showed a firmer texture and a lower overrun than the hydrogenated and cupuassu fat, probably for its crystallization profile and for suffering less destabilization of fat globules by the emulsifier. The formulation with cupuassu fat showed a similar response to the ageing process with the formulation of hydrogenated fat, as well as the texture and overrun suggesting that they had formed the best fat network. It also had the highest melting resistance, opposite to the formulation with palm fat. Sensorially, formulations with cupuassu fat and hydrogenated fat showed no significant differences. The longan fruit showed a high concentration of sugars, allowing the development of a formulation with a 25% reduction in the addition of sucrose, and good acceptance by sensory analysis.

Comportamento estrutural de formulações de gelado comestível com variações da base gordurosa