Abstract
A study was carried out to detect and assess possible sublethal injury and inactivation kinetics of Listeria monocytogenes suspended in phosphate-buffered saline (0.01 M PBS, pH = 7.4) by Ar/O2 plasma treatment. Results showed that both the germicidal effect and proportion of sublethally injured cells exhibited a time-dependent behavior, and post-treatment storage further extended the plasma lethality. The cytoplasmic enzymatic activity was reduced, but no considerable leakage levels of intracellular DNA and protein occurred. Incorporating the post-treatment storage for 48 h substantially decreased the intensity of intracellular reactive oxygen species (ROS) (p < 0.01) to relatively low level with no chemical residues. Moreover, the inactivation kinetics was well described by Weibull model (RMSENS = 0.074, RMSES = 0.093). The current study provided valuable information on the inactivation kinetics of L. monocytogenes and demonstrated the potential applications of plasma-mediated sterilization in liquid foodstuffs.
Published Version
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