Screening of lactic acid bacteria from vacuum packaged beef for antimicrobial activity

Brazilian Journal of Microbiology

Roseane B. P. Oliveira²  Afonso De L. Oliveira¹  M. Beatriz A. Glória² 

[1] ,Universidade Federal de Minas Gerais Faculdade de Farmácia Laboratório de Bioquímica de AlimentosBelo Horizonte MG ,Brasil

关键词: lactic acid bacteria;    beef;    Lactobacillus;    inhibitory activity;    pH;    heat resistance;    bactéria lática;    carne bovina;    Lactobacillus;    atividade antimicrobiana;    pH;    termo resistência;   

DOI  :  10.1590/S1517-83822008000200031

来源: SciELO

【 摘 要 】

The objective of this study was to isolate lactic acid bacteria (LAB) from vacuum packaged beef and to investigate their antagonist activity. LAB mean counts of 5.19 log cfu/cm² were obtained from five samples of vacuum packaged beef. Two hundred isolates were selected and screened for the inhibitory effect on five ATCC reference Lactobacillus strains. Thirty six isolates showed activity in the agar spot test against at least two of the indicator strains. However, only six cell free supernatants (CFS) from these isolates exhibited activity against the indicator strains using the well-diffusion test and conditions that eliminated the effects of organic acids and hydrogen peroxide. L. acidophilus was the most sensitive indicator tested, whereas L. plantarum and L. fermentum were the most resistant ones. Identification by MIDI system indicated that these LAB isolates were Lactococcus lactis subsp. cremoris, Pediococcus acidilactici, Lactobacillus delbrueckii subsp. bulgaricus and Lactobacillus casei GC subgroup A. The antagonistic factors produced by most of these LAB against L. acidophilus were resistant to heat treatment (100ºC for 10 min) and stable over a wide pH range (4.0 to 9.0). These data suggest that these isolates could be used as promising hurdles aiming increased safety and extended shelf life of meat products.

【 授权许可】

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