14607414

Source:http://linkedlifedata.com/resource/pubmed/id/14607414

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0220825, umls-concept:C0376625, umls-concept:C0392760, umls-concept:C0392762, umls-concept:C0549193, umls-concept:C1511790, umls-concept:C1550678
pubmed:issue	3
pubmed:dateCreated	2003-11-10
pubmed:abstractText	We report here the use of immunomagnetic (IM) electrochemiluminescence (ECL) for quantitative detection of Esherichia coli O157:H7 in water samples following enrichment in minimal lactose broth (MLB). IM beads prepared in-house with four commercial anti-O157 monoclonal antibodies were compared for efficiency of cell capture. IM-ECL responses for E. coli O157:H7 (strain SEA13B88) were similar for all four commercial anti-O157 LPS monoclonal antibodies. The ECL signal was linearly correlated with E. coli O157:H7 cell concentration, indicating a constant ECL response per cell. Twenty-two strains of E. coli O157:H7 or O157:NM gave comparable ECL signals using IM beads prepared in-house. To assess the potential for interference from background bacteria in MLB-enriched water samples, 10(4) cells of E. coli O157:H7 (strain SEA13B88) were added to enriched samples prior to analysis. There was considerable variability in recovery of E. coli O157:H7 cells; net ECL signals ranged from 1% to 100% of expected values (i.e., percent inhibition from 0% to 99%). Cultures of Klebsiella pneumoniae, Klebsiella oxytoca, and Enterobacter cloacae, subsequently isolated from MLB-enriched water samples via IM separation (IMS), were observed to interfere with the binding of E. coli O157:H7 cells to IM beads. Recoveries of 10(4) E. coli O157:H7 cells were </=10% in the presence of ca. 10(8) K. pneumoniae, K. oxytoca, or E. cloacae cells. None of these strains gave a positive IM-ECL signal. Although competitive binding decreased sensitivity, there still was a linear correlation between ECL signal and higher E. coli O157:H7 cell concentrations. These studies indicate that IM-ECL in conjunction with MLB enrichment is capable of quantitatively detecting as few as 10(3) to 10(5) E. coli O157:H7 cells ml(-1), depending on percent recoveries, in enriched samples that contain ca. 10(9) total lactose-fermenting bacteria ml(-1). Assuming comparable growth rates for E. coli O157:H7 and other lactose-fermenting bacteria in MLB, it may be possible to detect as few as one E. coli O157:H7 in 100 ml of raw water containing as many as 10(4) to 10(6) lactose-fermenting bacteria (i.e., total coliforms).
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/8306883
pubmed:citationSubset	IM
pubmed:status	MEDLINE
pubmed:month	Dec
pubmed:issn	0167-7012
pubmed:author	pubmed-author:BeltKenneth TKT, pubmed-author:KarnsJeffrey SJS, pubmed-author:SheltonDaniel RDR, pubmed-author:Van KesselJo Ann SJA, pubmed-author:WachtelMarian RMR
pubmed:issnType	Print
pubmed:volume	55
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	717-25
pubmed:dateRevised	2011-11-17
pubmed:meshHeading	pubmed-meshheading:14607414-Escherichia coli O157, pubmed-meshheading:14607414-Immunomagnetic Separation, pubmed-meshheading:14607414-Luminescent Measurements, pubmed-meshheading:14607414-Water Microbiology
pubmed:year	2003
pubmed:articleTitle	Evaluation of parameters affecting quantitative detection of Escherichia coli O157 in enriched water samples using immunomagnetic electrochemiluminescence.
pubmed:affiliation	Environmental Microbial Safety Laboratory, U.S. Department of Agriculture, ARS Bldg. 173, BARC-East, 10300 Baltimore Avenue, Beltsville, MD 20705-2350, USA. sheltond@ba.ars.usda.gov
pubmed:publicationType	Journal Article, Research Support, U.S. Gov't, Non-P.H.S.