Lactobacillus plantarum BL011 cultivation in industrial isolated soybean protein acid residue

Abstract In this study, physiological aspects of Lactobacillus plantarum BL011 growing in a new, all-animal free medium in bioreactors were evaluated aiming at the production of this important lactic acid bacterium. Cultivations were performed in submerged batch bioreactors using the Plackett-Burman methodology to evaluate the influence of temperature, aeration rate and stirring speed as well as the concentrations of liquid acid protein residue of soybean, soy peptone, corn steep liquor, and raw yeast extract. The results showed that all variables, except for corn steep liquor, significantly influenced biomass production. The best condition was applied to bioreactor cultures, which produced a maximal biomass of 17.87 g L-1, whereas lactic acid, the most important lactic acid bacteria metabolite, peaked at 37.59 g L-1, corresponding to a productivity of 1.46 g L-1 h-1. This is the first report on the use of liquid acid protein residue of soybean medium for L. plantarum growth. These results support the industrial use of this system as an alternative to produce probiotics without animal-derived ingredients to obtain high biomass concentrations in batch bioreactors.

Caracterização física, química e sensorial de sobremesas à base de soja, elaboradas com mucilagem de chia / Physical, chemical and sensory characterization of soy-based desserts made with chia mucilage

No desenvolvimento de produtos, é de suma importância o conhecimento da influência das modificações da formulação nas propriedades sensoriais, físicas e químicas destes. O objetivo deste trabalho foi caracterizar sobremesas à base de soja com e sem adição de mucilagem de chia, utilizada como espessante alimentar. As formulações foram caracterizadas quanto as suas propriedades reológicas, °Brix, pH e cor. O perfil sensorial foi determinado por Análise Descritiva Quantitativa (ADQ), utilizando-se uma equipe de 10 julgadores treinados. Os resultados mostraram que as amostras não diferiram quanto aos valores de pH, °Brix e coordenada cromática a*. Quanto aos outros parâmetros de cor e reológicos, foram detectadas diferenças significativas entre as amostras, o que mostra a influência do tipo de espessante nestas características. Os resultados da ADQ mostraram que as amostras não apresentaram diferenças estatísticas quanto aos atributos, cor rosa, sabor de goiaba, sabor de soja e cremosidade, porém diferiram quanto à consistência. Com isso, conclui-se que a adição da mucilagem de chia pode ser feita sem causar grandes modificações ao produto.

In product development is important to study the influence of ingredients in the physical, chemical and sensory properties of the product. The aim of this study was to characterize soy-based desserts with and without addition of chia mucilage, used as food thickener. The formulations were characterized for their rheological properties, °Brix, pH and color. The sensory profile was determined by Quantitative Descriptive Analysis (QDA) using 10 trained judges. The results regarding to pH, ° Brix and color coordinate a* did not differ. Unlike these parameters, the other chromaticity coordinates and the rheological properties presented significant statistical differences between the samples. The QDA results showed that the samples did not differ as to the attributes, color, pink guava flavor, creaminess and flavor of soy, but differed in consistency. Thus, it is concluded that the addition of mucilage chia can be made without causing major changes to the product.