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Rev. med. vet. zoot ; 61(3): 241-257, sep.-dic. 2014. ilus, tab
Article in Spanish | LILACS-Express | LILACS | ID: lil-742697

ABSTRACT

Se evaluó el efecto in vitro de Lactobacillus plantarum sobre Yersinia pseudotuberculosis aislada de cuyes (Cavia porcellus) e identificada bioquímica y molecularmente. Se determinó la viabilidad de L. plantarum a diferentes pH (3.25, 4.5, 7.6 y 8.2), sales biliares bovinas (3, 4 y 5%), bilis bovina (0.5, 1 y 2%) y temperatura (38 y 45°C). Se realizó antibiograma a ambas bacterias con Cefalotina, Cefepima, Ciprofloxacina, Dicloxacilina, Enrofloxacina, Gentamicina, Penicilina y Trimetropim-Sulfametoxasol. Se determinaron los péptidos de L. plantarum mediante HPLC y la cinética de crecimiento en dos sustratos (MRS y Pro), midiéndose: biomasa, pH, consumo de azúcar total y ácido láctico. Se observó un mejor crecimiento bajo pH 3.25, sales biliares 5%, bilis bovina 2% y temperatura de 45°C con valores de 3.0·10(12), 2.3·10(12), 8.6·10(11) y 3.0·10(12) UFC/ml, respectivamente. L. plantarum y el sobrenadante inhibieron a Y. pseudotuberculosis, con halos de 3 y 5 mm. Se observó resistencia de L. plantarum y Y. pseudotuberculosis a Penicilina y Dicloxacilina, respectivamente, con sensibilidad de ambas cepas a los demás antibióticos. Se evidenciaron los péptidos VAL-TIR-VAL y TIR-GLI-GLI-FA-MET en el sobrenadante de L. plantarum. Durante la fase logarítmica para los medios MRS y Pro se alcanzaron valores de 6.75·10(12) y 1.20·10(12) UFC/ml (biomasa), 6.96 y 5.49 (pH), y 0.65 y 0.76%, (ácido láctico), respectivamente. La comparación de los medios mediante un diseño de bloques al azar (P > 0.05), mostró similar comportamiento. L. plantarum demostró su potencial probiótico en condiciones in vitro.


The in vitro effect of Lactobacillus plantarum on Yersinia pseudotuberculosis isolated from guinea pig identified and evaluated biochemical and molecular. L. plantarum viability was determined at different pH (3.25, 4.5, 7.6 y 8.2), bovine bile salts (3, 4 y 5%), bovine bile (0.5, 1 y 2%) and temperature (38 y 45°C). Both bacteria susceptibility was performed with Cephalothin, Cefepime, Ciprofloxacin, Dicloxacillin, Enrofloxacin, Gentamicin, Trimethoprim-Sulfamethoxazole and Penicillin. L. plantarum peptides were determined by HPLC and growth kinetics on two substrates (MRS and Pro), measuring biomass, pH, total sugar consumption and lactic acid. Better growth was observed at 3.25 pH, 5% bile salts, 2% bovine bile and temperature 45 °C. with values 3,0·10(12), 2.3·10(12), 8.6·10(11) y 3.0·10(12) UFC/ml, respectively. L. plantarum and the supernatant inhibited Y. pseudotuberculosis, with halos of 3 to 5 mm. L. plantarum and resistance to penicillin and Y. pseudotuberculosis Dicloxacillin was observed, respectively, with sensitivity of both strains to other antibiotics. Peptides were evidenced VAL-TIR-VAL y TIR-GLI-GLI-FA-MET in the supernatant of L. plantarum. During the logarithmic phase for MRS and Pro 1012 values were reached 6.75·10(12) y 1.20·10(12) CFU / ml (biomass), 6.96 and 5.49 (pH) and 0.65 and 0.76 % (lactic acid) respectively. The comparison of means using a randomized block design (P > 0.05) showed similar behavior. L. plantarum demonstrated their probiotic potential in vitro conditions.

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