RESUMO: Para obter o suco de mirtilo com um alto teor de antioxidantes, é necessário realizar uma etapa de despectinização enzimática durante o processo. Esta etapa influenciará nas propriedades finais do suco de mirtilo, então, é necessário que as condições de operação sejam otimizadas. O objetivo deste trabalho foi avaliar os efeitos da temperatura, duração do tratamento e concentração do complexo enzimático na concentração de antocianinas e no rendimento do suco durante a despectinização enzimática. Os resultados indicaram que a melhor combinação de parâmetros foi de 50ºC, durante 1 à 3h e uma concentração de complexo enzimático de 4mg 100g-1 de LAFASE(r) CLARIFICATION e 8mg 100g-1 de LAFASE(r) HE GRAND CRU. Sob estas condições, foi obtido o suco de mirtilo com 798.41±8.03mg de-cianidina-3-glicosídeo L-1 e um rendimento de suco de 87%. A combinação das metodologias de superfície de resposta em função da preferência possibilitaram a otimização da despectinização do suco de mirtilo, em termos de teor de antocianinas e rendimento de suco.

ABSTRACT: To obtain blueberry juice with a high content of antioxidants it is necessary to introduce an enzymatic depectinization step into the process. Due to the importance of this step in the final properties of blueberry juice it is critical that the operation conditions be optimized. The aim of this research was to evaluate the effects of temperature, duration of treatment and enzymatic complex concentration on anthocyanin content and juice yield during enzymatic depectinization. Results indicated that the best factor combination was 50ºC during 1.3h and 4mg 100g-1 of LAFASE(r) CLARIFICATION and 8mg 100g-1 of LAFASE(r) HE GRAND CRU enzymatic complex concentration. Under these conditions, blueberry juice with 798.41±8.03mg of cyanidin-3-glucoside L-1 and a juice yield of 87% was obtained. The combination of the response surface and desirability function methodologies enabled the optimization of the blueberry juice during the depectinization step, in terms of anthocyanin content and juice yield.

Abstract Since the 1990s, in Argentina there has been considerable concern over whether higher education institutions must undertake the responsibility of teaching academic skills to their student population or if both undergraduates and graduates ought to cope with the enculturation process without assistance. Although academics seem to have reached an agreement and have put forward a number of actions aimed at facilitating the access of university students into their target discourse communities, there is still heated debate about how the issue must be approached. In this article we describe the initiatives carried out at two engineering colleges: the Facultad de Ciencias de la Alimentación and the Facultad de Ingeniería belonging to the Universidad Nacional de Entre Ríos that have paved the way for the inclusion of academic literacy development in the curriculum.