Document Detail


Probiotic bacteria as potential detoxification tools: assessing their heavy metal binding isotherms.
MedLine Citation:
PMID:  17110980     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Dietary exposure to heavy metals may have detrimental effects on human and animal health, even at low concentrations. Specific probiotic bacteria may have properties that enable them to bind toxins from food and water. We assessed the interaction of probiotic bacteria with cadmium and lead in vitro as an initial screening step to identify strains for heavy metal decontamination in food and intestinal models. Binding isotherms for cadmium and lead were characterized for Lactobacillus rhamnosus LC-705, Propionibacterium freudenreichii subsp. shermanii JS and a mix of them used by the food industry. Differences among the strains and their combinations in binding performance at a range of concentrations between 0.1 and 100 mg.L-1 were evaluated with the Langmuir model for biosorption. The effects of pH, contact time, and viability on the binding capacities were also investigated. All strains and their combinations were found to bind cadmium and lead efficiently at low concentration ranges commonly observed in foods. However, the two strains and their combinations differed significantly in their maximum binding capacities and affinities represented by the Langmuir constants Qmax and b, respectively. The binding seemed to occur instantaneously and in a pH-dependent manner, which can be perfectly described by a segmented linear-plateau model.
Authors:
Fandi Ibrahim; Teemu Halttunen; Raija Tahvonen; Seppo Salminen
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of microbiology     Volume:  52     ISSN:  0008-4166     ISO Abbreviation:  Can. J. Microbiol.     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-11-19     Completed Date:  2007-02-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372707     Medline TA:  Can J Microbiol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  877-85     Citation Subset:  IM    
Affiliation:
Department of Biochemistry and Food Chemistry and Functional Foods Forums, University of Turku, Finland. fanibr@utu.fi
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Binding, Competitive
Cadmium / metabolism
Hydrogen-Ion Concentration
Lactobacillus rhamnosus / metabolism
Lead / metabolism
Metals, Heavy / chemistry,  metabolism*
Probiotics / metabolism*
Propionibacterium / metabolism
Thermodynamics
Chemical
Reg. No./Substance:
0/Metals, Heavy; 7439-92-1/Lead; 7440-43-9/Cadmium

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


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