Document Detail


Response of cultures of Propionibacterium to acid and low pH: tolerance and inhibition.
MedLine Citation:
PMID:  9708284     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Seventeen Propionibacterium strains were tested for acid production and final pH achieved on glucose, fructose, or maltose as the primary carbon source. On average, strains of Propionibacterium acidipropionici produced more acid and reached lower final pH values than did strains of the other species. Three strains of P. acidipropionici, one Propionibacterium jensenii, and two Propionibacterium thoenii strains were tested further for the ability to survive and/or grow at low pH with lactic, hydrochloric, or propionic acid as acidulant. The organic acids were more inhibitory than hydrochloric acid; propionic acid was most inhibitory. In all cases, the P. jensenii and P. thoenii strains initiated growth and survived at lower pH values than did the p. acidipropionici stains. The ability to produce large amounts of acid or achieve low final pH values did not coincide with the ability to initiate growth or survive in low-pH conditions. Strains could not initiate growth below pH 5.0, but cultures started at neutral pH reached final pH values of less than 4.4. At neutral pH, strains could grow in the presence of increased lactate concentrations (up to 180 mM) or propionate concentrations (150 mM) that were inhibitory at acid pH. attempts to isolate variants able to initiate growth below pH 5.0 were unsuccessful.
Authors:
J L Rehberger; B A Glatz
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of food protection     Volume:  61     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  1998 Feb 
Date Detail:
Created Date:  1998-09-17     Completed Date:  1998-09-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7703944     Medline TA:  J Food Prot     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  211-6     Citation Subset:  IM    
Affiliation:
Department of Food Science and Human Nutrition, Iowa State University, Ames, 50011, USA.
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MeSH Terms
Descriptor/Qualifier:
Colony Count, Microbial
Culture Media
Hydrochloric Acid
Hydrogen-Ion Concentration
Lactic Acid
Propionibacterium / genetics,  physiology*
Propionic Acids
Temperature
Chemical
Reg. No./Substance:
0/Culture Media; 0/Propionic Acids; 50-21-5/Lactic Acid; 7647-01-0/Hydrochloric Acid; 79-09-4/propionic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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