Effect of an In Vitro Proximal Gastrointestinal Tract on Viability of Commercially Available Equine Probiotics

•The proximal gastrointestinal tract adversely affected micro-organisms in six of 11 probiotics with a gastric pH of 2.•Enterococcus faecium was most commonly adversely affected.•All probiotics failed to meet their micro-organism label claim.•All probiotics contained micro-organisms not listed on th...

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Published in:Journal of equine veterinary science Vol. 104; p. 103671
Main Authors: Berreta, Ana, Kopper, Jamie J., Alexander, Trevor L., Kogan, Clark J., Burbick, Claire R.
Format: Journal Article
Language:English
Published: Elsevier Inc 01-09-2021
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Abstract •The proximal gastrointestinal tract adversely affected micro-organisms in six of 11 probiotics with a gastric pH of 2.•Enterococcus faecium was most commonly adversely affected.•All probiotics failed to meet their micro-organism label claim.•All probiotics contained micro-organisms not listed on the label claim. Probiotics, by definition, are live micro-organisms and should remain viable when they reach the intended site of action which is typically the cecum and/or colon. In humans, probiotics often need enteric protection to survive transit through the proximal gastrointestinal (GI) tract. Typically, equine probiotics do not advertise enteric protection and to the author's knowledge the viability of equine probiotics after exposure to the proximal GI tract has not been evaluated. The objective of this study was to evaluate the effect of an in vitro simulation of the equine proximal GI tract on probiotic viability. We hypothesized that the simulated proximal GI tract would adversely effect microbial viability and that the adverse effects would be partially ameliorated by increasing the gastric pH to 4. A total of 11 products were evaluated of which six had at least one micro-organism that was adversely effected by exposure to the proximal GI tract and four of which had at least one micro-organism that was adversely affected when the gastric pH was increased to 4.0. Results from this study indicate that some micro-organisms in equine probiotics do not appear to be adversely affected by exposure to the equine proximal GI tract.
AbstractList •The proximal gastrointestinal tract adversely affected micro-organisms in six of 11 probiotics with a gastric pH of 2.•Enterococcus faecium was most commonly adversely affected.•All probiotics failed to meet their micro-organism label claim.•All probiotics contained micro-organisms not listed on the label claim. Probiotics, by definition, are live micro-organisms and should remain viable when they reach the intended site of action which is typically the cecum and/or colon. In humans, probiotics often need enteric protection to survive transit through the proximal gastrointestinal (GI) tract. Typically, equine probiotics do not advertise enteric protection and to the author's knowledge the viability of equine probiotics after exposure to the proximal GI tract has not been evaluated. The objective of this study was to evaluate the effect of an in vitro simulation of the equine proximal GI tract on probiotic viability. We hypothesized that the simulated proximal GI tract would adversely effect microbial viability and that the adverse effects would be partially ameliorated by increasing the gastric pH to 4. A total of 11 products were evaluated of which six had at least one micro-organism that was adversely effected by exposure to the proximal GI tract and four of which had at least one micro-organism that was adversely affected when the gastric pH was increased to 4.0. Results from this study indicate that some micro-organisms in equine probiotics do not appear to be adversely affected by exposure to the equine proximal GI tract.
ArticleNumber 103671
Author Kopper, Jamie J.
Berreta, Ana
Alexander, Trevor L.
Kogan, Clark J.
Burbick, Claire R.
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  givenname: Ana
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  organization: Department of Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, WA
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  givenname: Claire R.
  surname: Burbick
  fullname: Burbick, Claire R.
  organization: Washington Animal Disease Diagnostic Laboratory, Washington State University, Pullman, WA
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SubjectTerms Colon
Horse
Microbiota
Probiotic
Title Effect of an In Vitro Proximal Gastrointestinal Tract on Viability of Commercially Available Equine Probiotics
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