Enterobacteriaceae were also a major contributor to spoilage
because they had the second highest bacterial population, after LAB
and APC, either for core or purge samples. For core samples (Fig. 2),
the Enterobacteriaceae populations were log10 3.46 CFU/cm2 on day 0
and increased to log10 4.36 CFU/cm2 and log10 5.72 CFU/cm2 on days 5
and 15, respectively. After day 15, the Enterobacteriaceae populations
increased to approximately log10 6.6 CFU/cm2 and remained in that
range throughout the rest of the storage period. The Enterobacteriaceae
populations in purge samples were approximately log10 3.0 CFU/mL on
day 0 and increased to log10 4.90 CFU/mL by day 5 (Fig. 3). On day 15
and 30, the Enterobacteriaceae populations were approximately log10
5.7 CFU/mL and increased to approximately log10 6 CFU/mL for the
remainder of the storage period. These Enterobacteriaceae populations
are also consistent with the study done by Blixt and Borch (2002)
who reported similar populations of log10 5–7 CFU/g on pork loins
after 56 days at 4 °C. However, we found lower populations of Enterobacteriaceae
than Knox et al. (2008), who found log10 7–8 CFU/g Enterobacteriaceae
after 35 days at 4 °C. This difference could be attributable to a
higher initial population than in our study, or because of slight differences
in muscle pH between the two studies (Knox et al., 2008).
Enterobacteriaceae were also a major contributor to spoilagebecause they had the second highest bacterial population, after LABand APC, either for core or purge samples. For core samples (Fig. 2),the Enterobacteriaceae populations were log10 3.46 CFU/cm2 on day 0and increased to log10 4.36 CFU/cm2 and log10 5.72 CFU/cm2 on days 5and 15, respectively. After day 15, the Enterobacteriaceae populationsincreased to approximately log10 6.6 CFU/cm2 and remained in thatrange throughout the rest of the storage period. The Enterobacteriaceaepopulations in purge samples were approximately log10 3.0 CFU/mL onday 0 and increased to log10 4.90 CFU/mL by day 5 (Fig. 3). On day 15and 30, the Enterobacteriaceae populations were approximately log105.7 CFU/mL and increased to approximately log10 6 CFU/mL for theremainder of the storage period. These Enterobacteriaceae populationsare also consistent with the study done by Blixt and Borch (2002)who reported similar populations of log10 5–7 CFU/g on pork loinsafter 56 days at 4 °C. However, we found lower populations of Enterobacteriaceaethan Knox et al. (2008), who found log10 7–8 CFU/g Enterobacteriaceaeafter 35 days at 4 °C. This difference could be attributable to ahigher initial population than in our study, or because of slight differencesin muscle pH between the two studies (Knox et al., 2008).
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