Abstract

GONZALEZ-CRESPO, Annia  and  SOSA-ESPINOSA, Angela E.. Influence of the origin of the components of the culture medium on the quality of the microbiological assays for the determination of bacteriophages. Vaccimonitor [online]. 2017, vol.26, n.3, pp.88-92. ISSN 1025-028X.

Contamination by bacterial viruses is one of the most difficult problems to evaluate in the modern biotechnology industry, especially in the productions of recombinant proteins that are based on Escherichia coli strains. To certify that a strain bank is free of bacteriophage, the most recommended method is still the induction of the lytic cycle phase on plates with semisolid media. In this work we set out to evaluate means of cultures made with bases of different commercial houses for the detection of contaminating bacteriophages. For this purpose we used an environmental bacteriophage isolate and the LE392 sensitive strain and bases of the firms OXOID, BioCen and Biolife. After standardization of the test methodology, the ability of a concentrated preparation of the environmental isolate to form lysis plates in the media made with reagents from the three commercial houses was evaluated. The largest number of lysis plates was obtained when using the bases from the National Center of Biopreparates, the means where less lysis plates were observed was using bases from the Biolife Commercial House with two orders of magnitude less. The medium prepared with bases from the commercial house OXOID was the one that showed better lot to lot consistency

Keywords : bacteriophages; contamination; culture media.

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