Survival and growth of Listeria monocytogenes on fresh-cut apple slices and its interaction with Glomerella cingulata and Penicillium expansum.
Conway, W. S.; Leverentz, B.; Saftner, R. A.; Janisiewicz, W. J.; Sams, C. E.; Leblanc, E.;
Plant Disease Year: 2000 Vol: 84 Issue: 2 Pages: 177-181 Ref: 18 ref.
2000
บทคัดย่อ
The food-borne human pathogen L. monocytogenes survived and its populations increased on apple cv. Delicious slices at 10 or 20 deg C in air or controlled atmospheres of 0.5% O2 and 15% CO2, but did not grow at 5 deg C. Controlled atmosphere had no significant effect on the survival or growth of L. monocytogenes. The pathogen populations declined over time when grown in various concentrations of apple juice and the decline was greater as the concentration of the juice decreased. Populations of L. monocytogenes inoculated into decayed apple tissue continually increased on fruit decayed by G. cingulata but did not survive after 5 days on fruit decayed by P. expansum. The pH of the decayed area declined from pH 4.7 to 3.7 in the case of P. expansum, but in the case of G. cingulata the pH increased from pH 4.7 to 7.0. It is concluded that this pH modification may be responsible for affecting the growth of the food-borne pathogen. Storage temperature, as well as the absence of postharvest pathogens s
uch as G. cingulata, is important for maintaining the safety of fresh-cut apples.