title: Enhanced antimicrobial activity of nisin-loaded liposomal nanoparticles against foodborne pathogens.
abstract: This study was designed to evaluate the prolonged antimicrobial stability of nisin-loaded liposome (LipoN) nanoparticles against Listeria monocytogenes and Staphylococcus aureus. The sizes of bare liposomes and LipoN were uniformly distributed between 114 and 125 nm. The nanoparticles were homogeneously dispersed in water with less than 0.2 of polydispersity index. The zeta potential value of LipoN was +17.1 mV due to the positive charged nisin, attaining 70% of loading efficiency. The minimum inhibitory concentration of LipoN against L. monocytogenes and S. aureus was 320 international unit/mL. The LipoN significantly enhanced the antimicrobial stability in brain heart infusion agar compared to free nisin. The numbers of L. monocytogenes and S. aureus exposed to LipoN were effectively reduced by more than 6 log colony-forming unit/mL after 48 and 72 h of incubation, respectively. These results provide useful information for the development of antimicrobial delivery system to improve food safety.
authors.affiliation: Div. of Biomaterials Engineering, Kangwon Natl. Univ., Chuncheon, Gangwon 200-701, Republic of Korea.
authors.forename: Yunyun
authors.initials: Y
authors.lastname: Zou
authors.forename: Hyeon-Yong
authors.initials: HY
authors.lastname: Lee
authors.forename: Yong-Chang
authors.initials: YC
authors.lastname: Seo
authors.forename: Juhee
authors.initials: J
authors.lastname: Ahn
mesh_terms: D000890:Anti-Infective Agents / Q000494:pharmacology*; D015169:Colony Count, Microbial; D005506:Food Contamination / Q000032:analysis*; D005516:Food Microbiology; D005519:Food Preservation / Q000379:methods; D005520:Food Preservatives / Q000737:chemistry*; D008081:Liposomes; D008089:Listeria monocytogenes / Q000187:drug effects / Q000254:growth & development; D008826:Microbial Sensitivity Tests; D053758:Nanoparticles; D009561:Nisin / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects / Q000254:growth & development
chemical_list: D000890:Anti-Infective Agents; D005520:Food Preservatives; D008081:Liposomes; D009561:Nisin