Document Detail


Comparison between ultrafiltration and trichloroacetic acid precipitation method for concentration of Staphylococcus aureus enterotoxin in dairy samples.
MedLine Citation:
PMID:  15135957     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Staphylococcus aureus enterotoxin that may be contained at low concentrations in milk and dairy products can cause food poisoning. To detect this enterotoxin at low concentrations, samples should be concentrated. We evaluated the performance of centrifugal ultrafiltration method (UF) in comparison with trichloroacetic acid precipitation method (TCA) for the concentration of S. aureus enterotoxin in milk and dairy products. S. aureus enterotoxin A (SEA) were added at various concentrations to ultra high-temperature heating process (UHT) milk, UHT concentrated skim milk, UHT skim milk powder, low heat-treated (LH) skim milk powder, and raw milk. SEA was concentrated by TCA and UF once a day on a total of 3 days by different researchers to prepare test solutions. The fluorescence value (TV) of test solutions was determined using an immunofluorescence autoanalyzer (miniVIDAS), and the linearity and slope of the regression line, relative standard deviation (RSD(RW)) at each added concentration, detection limit (DL), quantification limit (QL), and the recovery rate by each concentration method were obtained according to the guidelines of the International Conference on Harmonization (ICH). The slope of the regression line obtained by UF was steeper than that by TCA for all dairy samples excluding LH (74 degrees C, 20 s) skim milk powder. RSDRW, DL, and QL obtained by UF were comparable to or more excellent than those obtained by TCA. The procedure of UF was simpler than that of TCA. The recovery rate and rapidity were similar between the two methods. The DL and QL of enterotoxins other than SEA in dairy products by UF or TCA were estimated based on the DL and QL of SEA. In this estimation, consideration was given to reactions between each enterotoxin and its antibody, and also to the immunoactivity maintenance rate of each enterotoxin after addition of trichloroacetic acid in TCA. The estimated values were similar to those obtained by experiments using enterotoxin C1 (SEC1). UF using a centrifugal ultrafiltration membrane can be more readily performed and similar to or more reliable than TCA. UF combined with a miniVIDAS can be used for quantitative routine analysis.
Authors:
T Soejima; E Nagao; T Kubota; H Yamagata; H Kagi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of food microbiology     Volume:  93     ISSN:  0168-1605     ISO Abbreviation:  Int. J. Food Microbiol.     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-05-11     Completed Date:  2004-08-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8412849     Medline TA:  Int J Food Microbiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  185-94     Citation Subset:  IM    
Copyright Information:
Copyright 2004 Elsevier B.V.
Affiliation:
Analytical Research Center, Morinaga Milk Industry Co. Ltd., 5-1-83, Higashihara, Zama City, Kanagawa 228-8583, Japan. t_soezim@morinagamilk.co.jp
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MeSH Terms
Descriptor/Qualifier:
Animals
Dairy Products / analysis*,  microbiology
Enterotoxins / isolation & purification*
Food Contamination
Food Handling / methods
Food Microbiology
Milk / chemistry*,  microbiology
Staphylococcal Food Poisoning / microbiology,  prevention & control
Staphylococcus aureus / drug effects,  growth & development*
Trichloroacetic Acid / pharmacology*
Ultrafiltration / methods*
Chemical
Reg. No./Substance:
0/Enterotoxins; 37337-57-8/enterotoxin A, Staphylococcal; 76-03-9/Trichloroacetic Acid

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


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