title: Inactivation of Listeria monocytogenes on agar and processed meat surfaces by atmospheric pressure plasma jets.
abstract: An apparatus for generating atmospheric pressure plasma (APP) jet was used to investigate the inactivation of Listeria monocytogenes on the surface of agar plates and slices of cooked chicken breast and ham. He, N₂ (both 7 L/min), and mixtures of each with O₂ (0.07 L/min) were used to produce the plasma jets. After treatment for 2 min with APP jets of He, He + O₂, N₂, or N₂ + O₂, the numbers of L. monocytogenes on agar plates were reduced by 0.87, 4.19, 4.26, and 7.59 log units, respectively. Similar treatments reduced the L. monocytogenes inoculated onto sliced chicken breast and ham by 1.37 to 4.73 and 1.94 to 6.52 log units, respectively, according to the input gas used with the N₂ + O₂ mixture being the most effective. Most APP jets reduced the numbers of aerobic bacteria on the meat surfaces to <10² CFU/g, and the numbers remained below that level of detection after storage at 10 °C for 7 days. The results indicate that APP jets are effective for the inactivation of L. monocytogenes on sliced meats and for prolonging the shelf-life of such foods.
authors.affiliation: Department of Animal Science and Biotechnology, Chungnam National University, Daejeon 305-764, Republic of Korea.
authors.forename: Hyun Jung
authors.initials: HJ
authors.lastname: Lee
authors.forename: Heesoo
authors.initials: H
authors.lastname: Jung
authors.forename: Wonho
authors.initials: W
authors.lastname: Choe
authors.forename: Jun Sang
authors.initials: JS
authors.lastname: Ham
authors.forename: Jun Heon
authors.initials: JH
authors.lastname: Lee
authors.forename: Cheorun
authors.initials: C
authors.lastname: Jo
mesh_terms: D000818:Animals; D001274:Atmospheric Pressure; D002645:Chickens; D005511:Food Handling; D005519:Food Preservation / Q000295:instrumentation / Q000379:methods*; D008089:Listeria monocytogenes / Q000737:chemistry / Q000254:growth & development*; D008461:Meat Products / Q000382:microbiology*; D050296:Microbial Viability; D013552:Swine