Document Detail

Inactivation of Pseudomonas fluorescens in skim milk by combinations of pulsed electric fields and organic acids.
MedLine Citation:
PMID:  15954714     Owner:  NLM     Status:  MEDLINE    
Pseudomonas fluorescens suspended in skim milk was inactivated by application of pulsed electric fields (PEF) either alone or in combination with acetic or propionic acid. The initial concentration of microorganisms ranged from 10(5) to 10(6) CFU/ml. Addition of acetic acid and propionic acid to skim milk inactivated 0.24 and 0.48 log CFU/ml P. fluorescens, respectively. Sets of 10, 20, and 30 pulses were applied to the skim milk using exponentially decaying pulses with pulse lengths of 2 micros and pulse frequencies of 3 Hz. Treatment temperature was maintained between 16 and 20 degrees C. In the absence of organic acids, PEF treatment of skim milk at field intensities of 31 and 38 kV/cm reduced P. fluorescens populations by 1.0 to 1.8 and by 1.2 to 1.9 log CFU/ml, respectively. Additions of acetic and propionic acid to the skim milk in a pH range of 5.0 to 5.3 and PEF treatment at 31, 33, and 34 kV/cm, and 36, 37, and 38 kV/cm reduced the population of P. fluorescens by 1.4 and 1.8 log CFU/ml, respectively. No synergistic effect resulted from the combination of PEF with acetic or propionic acid.
Juan J Fernández-Molina; Bilge Altunakar; Daniela Bermúdez-Aguirre; Barry G Swanson; Gustavo V Barbosa-Cánovas
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of food protection     Volume:  68     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-06-15     Completed Date:  2005-07-18     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:  1232-5     Citation Subset:  IM    
Department of Biological Systems Engineering, Washington State University, Pullman, Washington 99164-6120, USA.
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MeSH Terms
Acetic Acid / pharmacology*
Colony Count, Microbial
Dose-Response Relationship, Drug
Drug Synergism
Electric Stimulation / methods*
Food Microbiology
Food Preservation / methods
Hydrogen-Ion Concentration
Milk / microbiology*
Propionic Acids / pharmacology*
Pseudomonas fluorescens / drug effects,  growth & development*
Reg. No./Substance:
0/Propionic Acids; 64-19-7/Acetic Acid; 79-09-4/propionic acid

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

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