Establishment of Time-to-detection Model of Pseudomonas spp. in Atmosphere Modified Packaged Chilled Pork

doi:10.7506/spkx1002-6630-201313033

Abstract

Abstract:

This study was to establish a growth probability model of Pseudomonas spp. in atmosphere modified
packaged chilled pork at (4 ± 1) ℃. Linear regression was used to establish TTD (time-to-detection) models of
Pseudomonas spp. in different atmosphere conditions. Disinfected pock was inoculated with Pseudomonas spp., a specific
spoilage organisms in chilled pock. The results showed that in the absence of CO2, the TTD decreased with increasing
O2 concentration, but increased as CO2 concentration increased. TTD reduced sharply as initial inoculation increased.
However, no apparent decrease in TTD was found when initial inoculation was over 102 CFU/mL. The TTD models
developed in this study showed a regression coefficient (r2) higher than 0.959 and the coefficients of determination (R2)
for the observed versus predicted data were higher than 0.986. In addition, the Bf and Af for the TTD models were 1.012
and 1.086, respectively. Both were close to 1.

Key words: modified atmosphere package, chilled pork, time-to-detection, TTD model, Pseudomonas spp.

CLC Number:

TS251.51

QIU Jing，DONG Qing-li*，HU Meng-han. Establishment of Time-to-detection Model of Pseudomonas spp. in Atmosphere Modified Packaged Chilled Pork[J]. FOOD SCIENCE, 2013, 34(13): 152-156.

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