INTRODUÇÃOCom o aumento na expectativa de vida da população, aliado ao crescimento exponencial dos custos médico-hospitalares, a sociedade necessita vencer novos desafios, através do desenvolvimento de novos conhecimentos científicos e de novas tecnologias que resultem em modificações importantes no estilo de vida das pessoas. A nutrição precisa se adaptar a esses novos desafios, através do desenvolvimento de novos conceitos. A nutrição otimizada é um desses novos conceitos, dirigida no sentido de maximizar as funções fisiológicas de cada indivíduo, de maneira a assegurar tanto o bem-estar quanto a saúde, como também o risco mínimo de desenvolvimento de doenças ao longo da vida. Nesse contexto, os alimentos funcionais e especialmente os probióticos e prebióticos são conceitos novos e estimulantes (Roberfroid, 2002).São considerados alimentos funcionais aqueles que, além de fornecerem a nutrição básica, promovem a saú-de. Esses alimentos possuem potencial para promover a saúde através de mecanismos não previstos através da nutrição convencional, devendo ser salientado que esse efeito restringe-se à promoção da saúde e não à cura de doenças (Sanders, 1998).
The effect of inulin and/or okara flour on Lactobacillus acidophilus La-5 and Bifidobacterium animalis Bb-12 viability in a fermented soy product (FSP) and on probiotic survival under in vitro simulated gastrointestinal conditions were investigated throughout 28 days of storage at 4 °C. Employing a 2(2) design, four FSP trials were produced from soymilk fermented with ABT-4 culture (La-5, Bb-12, and Streptococcus thermophilus): FSP (control); FSP-I (with inulin, 3 g/100 mL of soymilk); FSP-O (with okara, 5 g/100 mL); FSP-IO (with inulin + okara, ratio 3:5 g/100 mL). Probiotic viabilities ranged from 8 to 9 log cfu/g during the 28 days of storage, and inulin and/or okara flour did not affect the viability of La-5 and Bb-12. Bb-12 resistance to the artificial gastrointestinal juices was higher than for La-5, since the Bb-12 and La-5 populations decreased approximately 0.6 log cfu/g and 3.8 log cfu/g, respectively, throughout storage period. Even though the protective effect of inulin and/or okara flour on probiotic microorganisms was not significant, when compared to a fresh culture, the FSP matrix improved Bb-12 survival on day 1 of storage and may be considered a good vehicle for Bb-12 and could play an important role in probiotic protection against gastrointestinal juices.
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