Avaliação de meios de cultura para quantificação de lactobacilos e bifidobacterias e contagem destes microrganismos em produtos lacteos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

This is a study about the behaviour of the different strains of lactic acid bacteria (eg: Lactobacillus acidophilus, L. lactis, L. delbruekií susp. bulgaricus, Streptococus thermophilus) and bifidobacteria, with different culture media (MRS, MRS- maltose, MRS -salicin, HHD eLA), in order to evaluate the similarity among them, the capacity of each one to recover and the capacity to enumerate different strains. Firstly we checked the behaviour of the pure strains then the strains in different mixtures and finally the strains existing in the yogurt and fermented milk that are commercialized in Brazilian market. We also study the viability of the lactic acid bacteria in yogurt during refrigerated storage. The results demonstrated that the four culture media were similary to the MRS in the capacity of recovering when the pure strain was checked. The culture media HHD was the best in the capacity of recovering with strains in different mixtures and with the strains existing in the yogurt and fermented milk. Through the study of the viability of the lactic acid bacteria in the products, it showed that the validity was adequate, at least, in the total counting of viable bacteria. However, in the counting of L. acidophilus, only 62% maintained viability of 106 UFC/mL (minimum level]. In The counting of bifidobactéria, only one product maintained viable cells with minimum leveI

ASSUNTO(S)

lactobacilo iogurte

ACESSO AO ARTIGO

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