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Article| Volume 74, ISSUE 4, P1196-1200, April 1991

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Relationship Between Bile Tolerance and the Presence, of a Ruthenium Red Staining Layer on Strains, of Lactobacillus acidophilus1

Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(91)78273-8
Relationship Between Bile Tolerance and the Presence, of a Ruthenium Red Staining Layer on Strains, of Lactobacillus acidophilus1
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      Abstract

      Seventeen strains of Lactobacillus acidophilus were evaluated to determine the relationship between bile tolerance and the presence of an outer polysaccharide layer exterior to the cell wall when viewed by transmission electron microscopy. Bile tolerance is necessary for survival of lactobacilli in the intestinal tract, and the polysaccharide layer may be responsible for adherence to human intestinal tissue. These two factors may be the basis for use of L. acidophilus as a dietary adjunct.
      Ten strains exhibited a ruthenium red-stained outer polysaccharide layer. Three of the 10 strains had extremely dense layers, which may indicate stronger adherence properties. Seven strains did not contain a ruthenium red-stained outer layer however, six strains that did not have the stained layer were resistant to 1.0% bile concentration. Fourteen strains were tolerant to 1% bile, me strain was tolerant to .6% bile, and two strains were sensitive to bile. No relationship between bile tolerance and the presence of the ruthenium red-stained outer polysaccharide layer was apparent.

      Key words

      Abbreviation key:

      EMS (electron microscopy sciences), RR (ruthenium red), TEM (transmission electron microscopy)

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      Article info

      Publication history

      Accepted: October 26, 1990
      Received: August 6, 1990

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(91)78273-8

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      © 1991 American Dairy Science Association. Published by Elsevier Inc.

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