Resumen

JURADO-GAMEZ, H; GUZMAN-INSUASTY, M  y  JARRIN-JARRIN, V. DETERMINATION OF KINETIC, TESTS AND GROWTH INHIBITION EFFECT OF Lactobacillus lactis IN VITRO IN Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus agalactiae AND Escherichia coli IN HOLSTEIN COWS. Rev. Med. Vet. Zoot. [online]. 2015, vol.62, n.2, pp.40-56. ISSN 0120-2952.  https://doi.org/10.15446/rfmvz.v62n2.51993.

The kinetics, growth tests and in vitro inhibition effect of L. lactis on S. aureus, S. epidermidis, S. agalactiae and E. coli was determined. Analyses were performed in the laboratory of microbiology at the University of Narino. Reference strains and strains isolated in Pasto Colombia was used. Inhibition of gentamicin, penicillin, ciprofloxacin, Dicloxacillin, Cefepime, cephalothin, ampicillin and trimethoprim sulfa estimated. Inhibition L. lactis strains pathogenic and supernatant was determined. L. lactis growth of various gastrointestinal conditions to further growth in MRS medium and varying pH, sugar, acidity and protein was assessed. Peptides and organic acids in the supernatant were determined by HPLC. Antibiotic resistance of the isolated strains was found, but no reference strains. Only S. aureus (reference strain) were resistant to L. lactis; S. agalactiae strains were resistant; while S. epidermidis and E. coli were susceptible. The supernatant inhibited more reference bacteria, which isolated. growth was observed 0 to 1.4 x 10⁹ CFU/ml in the gastrointestinal tests. Exponential phase was at 14:48 h (2 x 10¹¹ CFU/ ml), pH 4.29; acidity 0.62%; sugar 2.18 mg/l and 0.279 mg/l of protein. Peptide-VAL-TIR-VAL and 82.9% lactic acid was found. L. lactis inhibits pathogenic strains in vitro present in milk with subclinical mastitis from Narino (Colombia) conditions.

Palabras clave : antibiotics; biomass; functional; animal health.

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