Document Detail

Phages of Lactobacillus casei/paracasei: response to environmental factors and interaction with collection and commercial strains.
MedLine Citation:
PMID:  16430510     Owner:  NLM     Status:  MEDLINE    
AIM: To investigate the influence of several environmental factors on the viability and cell-adsorption for two Lactobacillus casei/paracasei bacteriophages (PL-1 and J-1). METHODS AND RESULTS: Both phages showed a remarkably high specificity of species, sharing similar host spectra. Two phages and four sensitive strains were used to conform five phage/strain systems. Each showed a particular behaviour (burst size: ranging from 32 to 160 PFU/infective centre; burst time: 120-240 min and latent time: 5-90 min). For both phages, the viability was not significantly affected from pH 4 to 11 (room temperature) and from pH 5 to 10 (37 degrees C). Adsorption rates were not influenced by calcium ions, but decreased after the thermal inactivation of cells. Adsorption rates were high between 0 and 50 degrees C with maximum values at 30 degrees C and pH 6. System PL-1/Lact. paracasei A showed noticeable differences in comparison with the others, being times required to reach 90% of adsorption of 4 h and lower than 45 min, respectively. CONCLUSIONS: The data obtained in this work demonstrated that environmental parameters can influence the viability and cell adsorption rates of Lact. casei/paracasei phages. The extent of this influence was phage dependent. SIGNIFICANCE AND IMPACT OF THE STUDY: This work contributes to the enlargement of the currently scarce knowledge of phages of probiotic bacteria.
M L Capra; A Quiberoni; J Reinheimer
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied microbiology     Volume:  100     ISSN:  1364-5072     ISO Abbreviation:  J. Appl. Microbiol.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-01-24     Completed Date:  2006-09-18     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9706280     Medline TA:  J Appl Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  334-42     Citation Subset:  IM    
Instituto de Lactología Industrial, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000 Santa Fe, Argentina.
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MeSH Terms
Bacteriophages / growth & development*
Calcium / metabolism
Hot Temperature
Hydrogen-Ion Concentration
Lactobacillus casei / virology*
Magnesium / metabolism
Potassium Chloride / metabolism
Sodium Chloride / metabolism
Species Specificity
Sucrose / metabolism
Reg. No./Substance:
57-50-1/Sucrose; 7439-95-4/Magnesium; 7440-70-2/Calcium; 7447-40-7/Potassium Chloride; 7647-14-5/Sodium Chloride

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