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Abstract
En el presente estudio se evaluó la capacidad probiótica in vitro de una cepa nativa de Saccharomyces cerevisiae (A) y se comparó con una cepa comercial (B) utilizada como probiótico. Para esto se determinó la concentración de melaza de caña (10, 20 y 30% (p/v)) que permitiera obtener la mayor cantidad de biomasa de las cepas, así mismo se determinaron parámetros cinéticos. La concentración de melaza que arrojó mejores resultados fue 20% (p/v) y se encontró diferencia en la producción de biomasa para la cepa en estudio A (28g/L) y la cepa control B (3g/L) en medio melaza. Se realizaron pruebas in vitro como resistencia a sales biliares, tolerancia a rangos de pH y jugos gástricos, donde no se observaron diferencias entre la cepa A y B al medir el crecimiento. La reducción del colesterol en presencia de sales biliares después de 12 horas de incubación fue de 54% para la cepa A y 58% para la B. Por último se realizó una prueba de adherencia en células Caco-2, encontrando adherencia a estas por parte de ambas cepas. De acuerdo con los resultados anteriores se demostró que la cepa A tiene propiedades probióticas in vitro que pueden ser corroboradas con posteriores estudios in vivo que confirmen su utilización como probiótico en nutrición animal.
Palabras clave: Adherencia, Biomasa, Melaza de caña, Probiótico, Saccharomyces, Tolerancia
Abstract
The in vitro probiotic capacity of a native strain of Saccharomyces cerevisiae (A) was evaluated and compared with a commercial strain (B) used as a probiotic. The effect of the concentration of sugarcane molasses (10, 20 and 30% (w/v)) on the biomass production was investigated and kinetic parameters were determined. The best molasses concentration was 20% (w/v) and differences in biomass production on molasses medium between strain A (28 g/L) and control strain B (3 g/L) were observed. In vitro tests such as tolerance to bile salts, pH and gastric juices were carried out, and no differences in growth between strain A and B were found. Cholesterol reduction on presence of bile salts after 12 hours of incubation was of 54% for strain A and 58% for strain B. Both strains showed adherence to Caco-2 cells. Results reveal that strain A possesses in vitro probiotic properties that can be verified with further in vivo studies to confirm its suitability as probiotic in animal nutrition.
Key words: Adherence, Biomass, Sugarcane molasses, Probiotic, Saccharomyces, Tolerance
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