3 research outputs found

    Características probióticas de cepas de Lactobacillus plantarum de mantequilla tradicional de leche de camello de regiones áridas (Sáhara) de Argelia

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    Lactobacillus plantarum strains previously isolated from the traditional butter made from camel milk (shmen) were evaluated for some probiotic criteria. Among 38 strains investigated for bile resistance, 14 were tolerant to 2% oxgall with survival percentages ranging from 69 to 75%. Out of these, only 4 strains (L. plantarum SH5, SH12, SH24 and SH32) were sufficiently resistant to pH 2.0 for 2 to 6 h incubation periods. Only crude extracts of L. plantarum SH12 and L. plantarum SH24 were inhibitory against Lactococcus lactis B8, the strain used as indicator. The antibacterial activity of crude extracts was completely lost after treatment with α-chymotrypsin and proteinase K. L. plantarum SH12 and SH24 strains were susceptible to penicillin G, oxacillin, vancomycin and clindamycin, but resistant to tetracycline and kanamycin. These strains showed rapid acidification activity (0.921 and 1.075 mmol/l of lactic acid, respectively), a good proteolytic activity (5.45 and 3.49 mg/l tyrosine at 72 h, respectively) and high survival percentage after freeze-drying. None of the strains produced polysaccharides or haemolysin in sheep blood.Se evalúan algunas características probióticas de cepas de Lactobacillus plantarum aisladas de la mantequilla tradicional elaborada a partir de leche de camello (shmen). De 38 cepas investigadas para resistencia biliar, 14 fueron tolerantes a un 2% oxgall con porcentajes de supervivencia entre 69 y 75%. De éstas, sólo 4 cepas (L. plantarum SH5, SH12, SH24 and SH32) fueron suficientemente resistentes a pH 2 con periodos de incubación entre 2 y 6 h. Únicamente los extractos crudos de L. plantarum SH12 y L. plantarum SH24 fueron inhibitorios frente a Lactococcus lactis B8, la cepa utilizada como indicador. La actividad antibacteriana de los extractos crudos se perdió completamente después de tratamiento con α-quimotripsina y proteinasa K. Las cepas SH12 y SH24 fueron susceptibles a la penicilina G, oxacilina, vancomicina y clindamicina, pero resistentes a tetraciclina y kanamicina. Dichas cepas mostraron una rápida actividad acidificante (0,921 y 1,075 mmol/l de ácido láctico, respectivamente), una buena actividad proteolítica (5,45 y 3,49 mg/l de tirosina a las 72 h, respectivamente) y un alto porcentaje de supervivencia después de liofilización. Ninguna de las cepas produjo polisacáridos o hemolisina en sangre de oveja

    Probiotic characteristics of <i>Lactobacillus plantarum</i> strains from traditional butter made from camel milk in arid regions (Sahara) of Algeria

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    Lactobacillus plantarum strains previously isolated from the traditional butter made from camel milk (shmen) were evaluated for some probiotic criteria. Among 38 strains investigated for bile resistance, 14 were tolerant to 2% oxgall with survival percentages ranging from 69 to 75%. Out of these, only 4 strains (L. plantarum SH5, SH12, SH24 and SH32) were sufficiently resistant to pH 2.0 for 2 to 6 h incubation periods. Only crude extracts of L. plantarum SH12 and L. plantarum SH24 were inhibitory against Lactococcus lactis B8, the strain used as indicator. The antibacterial activity of crude extracts was completely lost after treatment with α-chymotrypsin and proteinase K. L. plantarum SH12 and SH24 strains were susceptible to penicillin G, oxacillin, vancomycin and clindamycin, but resistant to tetracycline and kanamycin. These strains showed rapid acidification activity (0.921 and 1.075 mmol/l of lactic acid, respectively), a good proteolytic activity (5.45 and 3.49 mg/l tyrosine at 72 h, respectively) and high survival percentage after freeze-drying. None of the strains produced polysaccharides or haemolysin in sheep blood.Se evalúan algunas características probióticas de cepas de Lactobacillus plantarum aisladas de la mantequilla tradicional elaborada a partir de leche de camello (shmen). De 38 cepas investigadas para resistencia biliar, 14 fueron tolerantes a un 2% oxgall con porcentajes de supervivencia entre 69 y 75%. De éstas, sólo 4 cepas (L. plantarum SH5, SH12, SH24 and SH32) fueron suficientemente resistentes a pH 2 con periodos de incubación entre 2 y 6 h. Únicamente los extractos crudos de L. plantarum SH12 y L. plantarum SH24 fueron inhibitorios frente a Lactococcus lactis B8, la cepa utilizada como indicador. La actividad antibacteriana de los extractos crudos se perdió completamente después de tratamiento con α-quimotripsina y proteinasa K. Las cepas SH12 y SH24 fueron susceptibles a la penicilina G, oxacilina, vancomicina y clindamicina, pero resistentes a tetraciclina y kanamicina. Dichas cepas mostraron una rápida actividad acidificante (0,921 y 1,075 mmol/l de ácido láctico, respectivamente), una buena actividad proteolítica (5,45 y 3,49 mg/l de tirosina a las 72 h, respectivamente) y un alto porcentaje de supervivencia después de liofilización. Ninguna de las cepas produjo polisacáridos o hemolisina en sangre de oveja
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