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Article| Volume 79, ISSUE 9, P1529-1536, September 1996

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Evaluation of Media for Selective Enumeration of Streptococcus thermophilus, Lactobacillus delbrueckii ssp. bulgaricus, Lactobacillus acidophilus, and Bifidobacteria

  • R.I. Dave
    Affiliations
    Department of Food Technology, Victoria University of Technology, Werribee Campus, PO Box 14428, MCMC Melbourne, Victoria 8001, Australia
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  • N.P. Shah
    Correspondence
    To whom correspondence should be addressed.
    Affiliations
    Department of Food Technology, Victoria University of Technology, Werribee Campus, PO Box 14428, MCMC Melbourne, Victoria 8001, Australia
    Search for articles by this author
Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(96)76513-X
Evaluation of Media for Selective Enumeration of Streptococcus thermophilus, Lactobacillus delbrueckii ssp. bulgaricus, Lactobacillus acidophilus, and Bifidobacteria
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      Abstract

      Fifteen media were evaluated to determine their suitability for selective enumeration of Streptococcus thermophilus, Lactobacillus delbrueckii ssp. bulgaricus, Lactobacillus acidophilus, and bifidobacteria using 5 to 6 strains of each of the four groups of organisms. Streptococcus thermophilus agar was found to be suitable for selective enumeration of S. thermophilus under aerobic incubation at 37°C for 24 h. The MRS agar at pH 5.2 or reinforced clostridial agar at pH 5.3 could be used for the selective enumeration of L. delbrueckii ssp. bulgaricus when the incubation was carried out at 45°C for ≥72 h. However, the recovery of this organism was lower on MRS agar at pH 5.2 or reinforced clostridial agar at pH 5.3 than that obtained on MRS agar. The recovery of L. acidophilus and bifidobacteria on MRS agar and MRS-maltose agar was similar; MRS-maltose agar could be used to enumerate total counts of L. acidophilus and bifidobacteria. For selective enumeration of L. acidophilus, MRS-salicin agar or MRS-sorbitol agar could be used. For selective enumeration of bifidobacteria, MRS NNLP (nalidixic acid, neomycin sulfate, lithium chloride, and paromomycin sulfate) agar was suitable; however, determination of bifidobacteria by differential counts between L. acidophilus enumerated on MRS-salicin agar or MRS-sorbitol agar and the total counts of L. acidophilus and bifidobacteria obtained from MRS-maltose agar resulted in higher recovery of some strains of bifidobacteria. Other media that were evaluated in this study were not suitable for selective enumeration.

      Key words

      Abbreviation Key:

      NNLP (nalidixic acid, neomycin sulfate, lithium chloride, and paromomycin sulfate), RCA (reinforced clostridial agar), ST agar (Streptococcus thermophilus agar)

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      Article info

      Publication history

      Accepted: March 22, 1996
      Received: July 13, 1995

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(96)76513-X

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      © 1996 American Dairy Science Association. Published by Elsevier Inc.

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