title: Acid adaptation affects the viability of Listeria monocytogenes BCRC 14846 and Salmonella Typhimurium BCRC 10747 exposed to disinfectants at 25°C and 40°C.
abstract: In the present study, Listeria monocytogenes BCRC 14846 and Salmonella Typhimurium BCRC 10747 were subjected to acid adaptation at pH 5.5 at 37°C for 1 and 4 h, respectively. The viability of the acid-adapted cells of test organisms exposed to Clidox-S, a chlorine-containing disinfectant, and Quatricide, a quaternary ammonium compound, was examined and compared with that of the control cells at 25°C and 40°C. Results revealed that acid adaptation significantly enhanced the viability of L. monocytogenes and Salmonella Typhimurium exposed to the disinfectants under investigation. Both pathogens examined were more susceptible to Clidox-S and Quatricide at 40°C than at 25°C. Further, L. monocytogenes was more susceptible to Quatricide than Salmonella Typhimurium, whereas Salmonella Typhimurium was more susceptible to Clidox-S than L. monocytogenes.
authors: Graduate Institute of Food Science and Technology, National Taiwan University, 59 Keelung Road Lane 44, Taipei 106, Taiwan.
authors: Meng-Hsuan
authors: MH
authors: Lin
authors: Shiow-Ling
authors: SL
authors: Lee
authors: Cheng-Chun
authors: CC
authors: Chou
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology*; D002713:Chlorine / Q000494:pharmacology*; D015169:Colony Count, Microbial; D004202:Disinfectants / Q000494:pharmacology*; D024881:Drug Resistance, Bacterial / Q000502:physiology; D005516:Food Microbiology; D006863:Hydrogen-Ion Concentration; D008089:Listeria monocytogenes / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*; D050296:Microbial Viability; D000644:Quaternary Ammonium Compounds / Q000494:pharmacology*; D012486:Salmonella typhimurium / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*; D013696:Temperature
chemical_list: D004202:Disinfectants; D000644:Quaternary Ammonium Compounds; D002713:Chlorine