Formulation of mayonnaises containing PUFAs by the addition of microencapsulated chia seeds, pumpkin seeds and baru oils.

There is an increasing demand for healthier foodstuff containing specific compounds such as Polyunsaturated Fatty Acids (PUFAs). In the case of PUFAs, protection against oxidative degradation is challengeable and microencapsulation emerges as an alternative. Mayonnaises containing microencapsulated oils could be a source of PUFAs. The objective was to formulate mayonnaises containing microencapsulated chia seeds oil, pumpkin seeds oil or baru oil. Micrometric particles with high encapsulation efficiency were produced and thermal analyses indicated an increased thermal stability of all oils after encapsulation. Rheology studies highlighted an increase in the mayonnaise viscosity when microparticles containing chia and pumpkin seeds oil were added. Mechanical texture was not affected by the presence of microparticles in the mayonnaise in all formulations tested. Nevertheless, samples containing microcapsules up to 5%wt were not distinguished from the base-mayonnaise in the sensorial test. Overall, enriched mayonnaises were successfully produced and encapsulation was efficient in protecting oils from oxidation.

Comportamento reológico de extratos de gräos, farinha integral e isolado protéico de soja / Rheological behavior of soilmilk, whole soy flour and soy isolated protein

Estudou-se o comportamento reológico de extratos elaborados com gräos, farinha integral e isolado protéico de soja. Extratos com 3 por cento de proteína foram obtidos de gräos de soja (em equipamento conhecido como vaca mecânica), de farinha integral e de isolado protéico (por dissoluçäo em água) e pasteurizados a 74 =- 2 graus C por 15 seg. Os parâmetros reológicos estudados foram o coeficiente de consistência, o índice de comportamento do fluxo e a viscosidade aparente. Foram determinados, também, sólidos totais, proteínas, lipídios, cinzas, fibra bruta, carboidratos e índice de sedimentaçäo (AOAC, 1995). verificou-se que a viscosidade aparente a 4 e 25 graus C do extrato obtido de gräos de soja (Fluído näo-newtoniano com comportamento pseudpl0stico) foi maior que a do extrato da farinha (fluído nä-newtoniano com comportamento pseudoplástico a 4 graus C e dilatante a 25 graus C) e do isolado (fluído newtoniano). O maior índice de sedimentaçäo constatado no extrato de farinha integral e o baixo teor de sólidos solúveis no isolado protéico foram determinantes, entre outros fatores, no comportamento reológico verificado.