[Development of effective detection method for Coxiella burnetii in mayonnaise by real-time PCR and investigation of C. burnetii contamination in commercial mayonnaise in Tokyo].
Shokuhin Eiseigaku Zasshi
; 47(1): 1-8, 2006 Feb.
Article
em Ja
| MEDLINE
| ID: mdl-16619850
ABSTRACT
A PCR method for the effective detection of Coxiella burnetii in commercially available mayonnaise was developed. Sample preparations were isolated from 50 g portions of each mayonnaise product by four successive extraction steps in phosphate buffer with 2.0 M NaCl. These extracts were then centrifuged at 20,000 x g for 60 min. DNA was isolated from the solution containing the precipitate with a commercial kit, and amplified quantitatively using real-time PCR that targeted the com1 region of C. burnetii. The recoveries of C. burnetii from 2 kinds of commercial mayonnaise specimens, with a baseline control of 1 x 10(7) particles of the Nine Mile phase II strain, were 85.0 +/- 6.0% and 72.0 +/- 0.4%, respectively. The determination limit of this method was 500 C. burnetii particles per 50 g of mayonnaise. The DNA specimens isolated from 50 different commercial mayonnaise samples sold in Tokyo using this method were amplified using both nested PCR and real-time PCR. No contamination by C. burnetii was detected in any of the mayonnaise samples.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Contaminação de Alimentos
/
Reação em Cadeia da Polimerase
/
Coxiella burnetii
/
Microbiologia de Alimentos
Tipo de estudo:
Diagnostic_studies
País/Região como assunto:
Asia
Idioma:
Ja
Revista:
Shokuhin Eiseigaku Zasshi
Ano de publicação:
2006
Tipo de documento:
Article