Evaluation of different DNA extraction procedures for the detection of Salmonella from chicken products by polymerase chain reaction.

Abstract:

:Polymerase chain reaction (PCR) was used after a short pre-enrichment culture to detect Salmonella subspecies in chicken fillets. A direct PCR assay performed with chicken meat inoculated with Salmonella Typhimurium produced no PCR products. Six different DNA extraction protocols were tested to recover efficiently Salmonella DNA after a short incubation period. Three of them gave results that were reliable, rapid and sensitive. Successful protocols used Proteinase K and/or a centrifugation step to concentrate the samples. For reliable detection of Salmonella subspecies, a few thousand bacterial cells per ml must be present. To obtain this number of bacterial cells with an inoculation of about one cell in 25 g of ionized food products, it was necessary to incubate samples for at least 10 h before PCR. A larger inoculum of approximately 10 cells in 25 g of ionized food products, required 8 h in culture broth to give positive results by PCR-based assay.

journal_name

Lett Appl Microbiol

authors

Soumet C,Ermel G,Fach P,Colin P

doi

10.1111/j.1472-765x.1994.tb00458.x

subject

Has Abstract

pub_date

1994-11-01 00:00:00

pages

294-8

issue

5

eissn

0266-8254

issn

1472-765X

journal_volume

19

pub_type

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