Effect of atmospheric pressure plasma on inactivation of pathogens inoculated onto bacon using two different gas compositions.
Atmospheric pressure plasma (APP) is an emerging non-thermal pasteurization method for the enhancement of food safety. In this study, the effect of APP on the inactivation of pathogens inoculated onto bacon was observed. Sliced bacon was inoculated with Listeria monocytogenes (KCTC 3596), Escherichia coli (KCTC 1682), and Salmonella Typhimurium (KCTC 1925). The samples were treated with APP at 75, 100, and 125 W of input power for 60 and 90 s. Two gases, helium (10 lpm) or a mixture of helium and oxygen, (10 lpm and 10 sccm, respectively) were used for the plasma generation. Plasma with helium could only reduce the number of inoculated pathogens by about 1-2 Log cycles. On the other hand, the helium/oxygen gas mixture was able to achieve microbial reduction of about 2-3 Log cycles. The number of total aerobic bacteria showed 1.89 and 4.58 decimal reductions after plasma treatment with helium and the helium/oxygen mixture, respectively. Microscopic observation of the bacon after plasma treatment did not find any significant changes, except that the L∗-value of the bacon surface was increased. These results clearly indicate that APP treatment is effective for the inactivation of the three pathogens used in this study, although further investigation is needed for elucidating quality changes after treatment.
Department of Animal Science and Biotechnology, Chungnam National University, Yuseong-Gu, Daejeon, Republic of Korea.
Binna
B
Kim
Hyejeong
H
Yun
Samooel
S
Jung
Yeonkook
Y
Jung
Heesoo
H
Jung
Wonho
W
Choe
Cheorun
C
Jo
D005516:Food Microbiology; D005519:Food Preservation / Q000379:methods*; D059022:Food Safety; D006371:Helium / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D008089:Listeria monocytogenes / Q000254:growth & development*; D008461:Meat Products / Q000382:microbiology*; D010100:Oxygen / Q000378:metabolism; D058626:Plasma Gases / Q000378:metabolism*; D012486:Salmonella typhimurium / Q000254:growth & development*; D013858:Thiobarbiturates / Q000378:metabolism
D058626:Plasma Gases; D013858:Thiobarbiturates; D006371:Helium; C029684:thiobarbituric acid; D010100:Oxygen