Development of a controlling method for Escherichia coli O157:H7 and Salmonella spp. in fresh market beef by using polylysine and modified atmosphere packaging

作者：Miya Satoko; Takahashi Hajime^*; Hashimoto Miho; Nakazawa Moemi; Kuda Takashi; Koiso Hiroaki; Kimura Bon

来源：Food Control, 2014, 37: 62-67.

DOI：10.1016/j.foodcont.2013.09.028

• Escherichia coli
• O157
• Salmonella
• Antimicrobial
• Polylysine
• Beef

Escherichia coli O157:H7 and Salmonella spp. often contaminate fresh beef. In Japan, an E coli outbreak caused by raw beef made 181 people ill and 5 individuals dead in 2011. Responding to this outbreak, an effective sterilization method for fresh beef is expected to be developed. In this study, epsilon-polylysine combined with CO2-packaging method was examined for controlling these pathogens in fresh beef. At an incubation temperature of 4 degrees C, approximately 4.3 log and 2.4 log reduction in bacterial numbers were observed after 7-day incubation for E. coli O157:H7 and Salmonella, respectively, in epsilon-polylysine-added beef. When effectiveness of CO2-packaging combined with epsilon-polylysine was investigated, CO2 did not have additional inhibiting effect on bacterial growth compared to only-epsilon-polylysine-treated samples when incubated at 4 degrees C. However, effectiveness of CO2 was observed when incubated at 10 degrees C where approximately 2.9 log and 4.4 log reduction in E. coli cell numbers were observed in only-epsilon-polylysine-treated samples and polylysine-and CO2-treated group, respectively, and approximately 1.7 log and 3.5 log reduction in Salmonella cell numbers were observed in only-epsilon-polylysine-treated samples and polylysine and CO2-treated group, respectively. This study confirmed that epsilon-polylysine or epsilon-polylysine combined with CO2 packaging are effective in preventing foodborne diseases caused by raw beef.

• 出版日期2014-3