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- W2093722712 abstract "Competitive polymerase chain reaction (cPCR) was used to develop a direct enumeration method of Listeria monocytogenes in milk. Sterile milk was artificially inoculated with L. monocytogenes and DNA was extracted using guanidine thiocyanate/phenol/chloroform, followed by PCR. Several primers for L. monocytogenes hlyA gene were tested for specific detection and DG69/DG74 primer set was selected. The primer set produced a 636-bp band from L. monocytogenes, but no band appeared from the other six Listeria spp. tested. A detection limit was as few as 10(3) colony-forming unit (cfu) per 0.5 ml of milk with this primer set. When the samples were cultured at 25 degrees C for 15 h in a TSBY medium, even a single bacterium could be detected with this primer set by PCR. For the cPCR, hlyA gene segment was cloned in pGem-4Z vector and was modified to produce competitor DNA. The competitor DNA has the same primer binding sites and sequences as the target DNA except EcoRI site. Known amount of competitor DNA was coamplified with L. monocytogenes total DNA isolated from artificially inoculated milk. The target DNA and competitor DNA were distinguished by EcoRI digestion after cPCR. The cell number determined by cPCR was approximately equal to the colony-forming unit from conventional plate counting method. For the whole procedure, it took only 5 h." @default.
- W2093722712 created "2016-06-24" @default.
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- W2093722712 date "2003-07-01" @default.
- W2093722712 modified "2023-10-10" @default.
- W2093722712 title "Rapid enumeration of Listeria monocytogenes in milk using competitive PCR" @default.
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- W2093722712 doi "https://doi.org/10.1016/s0168-1605(02)00401-4" @default.
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