2.4. Recovery of the surviving bacteria
The treated samples were retrieved to recover the survivors by
adding 10ml of 0.1% PWto each sample bag and mixed for 2min in a
mechanical stomacher (Model Bag Mixer 100W, Inter Science Co.,
France). The filtrate, after proper decimal dilutions, was plated in
triplicate onto Tryptic Soy agar (TSA, BD/Difco), SMAC, and TSA/R
(TSA plates containing 100 mg/L rifampicin) plates for total aerobic
bacteria, the “Big Six” non-O157 STECs and E. coli O157:H7 count,
respectively. The plates were maintained at room temperature for
2 h to allowthe injured cells to recover (Huang, 2004; Solomon et al.,
2006), and then incubated at 37 C for 24 h.
2.4. Recovery of the surviving bacteriaThe treated samples were retrieved to recover the survivors byadding 10ml of 0.1% PWto each sample bag and mixed for 2min in amechanical stomacher (Model Bag Mixer 100W, Inter Science Co.,France). The filtrate, after proper decimal dilutions, was plated intriplicate onto Tryptic Soy agar (TSA, BD/Difco), SMAC, and TSA/R(TSA plates containing 100 mg/L rifampicin) plates for total aerobicbacteria, the “Big Six” non-O157 STECs and E. coli O157:H7 count,respectively. The plates were maintained at room temperature for2 h to allowthe injured cells to recover (Huang, 2004; Solomon et al.,2006), and then incubated at 37 C for 24 h.
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