title: Antimicrobial Effect of Nisin against Bacillus cereus in Beef Jerky during Storage.
abstract: The microbial distribution of raw materials and beef jerky, and the effect of nisin on the growth of Bacillus cereus inoculated in beef jerky during storage, were studied. Five strains of pathogenic B. cereus were detected in beef jerky, and identified with 99.8% agreement using API CHB 50 kit. To evaluate the effect of nisin, beef jerky was inoculated with approximately 3 Log CFU/g of B. cereus mixed culture and nisin (100 IU/g and 500 IU/g). During the storage of beef jerky without nisin, the number of mesophilic bacteria and B. cereus increased unlikely for beef jerky with nisin. B. cereus started to grow after 3 d in 100 IU nisin/g treatment, and after 21 d in 500 IU nisin/g treatment. The results suggest that nisin could be an effective approach to extend the shelf-life, and improve the microbial safety of beef jerky, during storage.
authors.affiliation: Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 143-701, Korea.
authors.forename: Na-Kyoung
authors.initials: NK
authors.lastname: Lee
authors.affiliation: National Institute of Animal Science, RDA, Suwon 441-706, Korea.
authors.forename: Hyoun Wook
authors.initials: HW
authors.lastname: Kim
authors.affiliation: Korea Livestock Products HACCP Accreditation Service, Anyang 430-731, Korea.
authors.forename: Joo Yeon
authors.initials: JY
authors.lastname: Lee
authors.affiliation: Animal Science Department, Iowa State University, Ames, IA 50011, USA.
authors.forename: Dong Uk
authors.initials: DU
authors.lastname: Ahn
authors.affiliation: Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 143-701, Korea.
authors.forename: Cheon-Jei
authors.initials: CJ
authors.lastname: Kim
authors.affiliation: Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 143-701, Korea; Bio/Molecular Informatics Center, Konkuk University, Seoul 143-701, Korea.
authors.forename: Hyun-Dong
authors.initials: HD
authors.lastname: Paik
keywords: Bacillus cereus; beef jerky; nisin, microbial safety; pathogenic bacteria