The Role of Different Atmospheric Pressure Plasma Treatments for Inactivation of Bacteria Biofilmson Stainless Steel

Escherichia coli O157:H7;Listeria monocytogenes;Biofilm;Atmospheric pressure plasma;Inactivation mechanism;Chemical species;630

농업생명과학대학 농생명공학부 ;

University:서울대학교 대학원

关键词: Escherichia coli O157:H7;    Listeria monocytogenes;    Biofilm;    Atmospheric pressure plasma;    Inactivation mechanism;    Chemical species;    630;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/137586/1/000000145686.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

2) plasma treatment dissolved in distilled water (DW-P), 3) 100 ppm of sodium chloride (NaCl-P), and 4) 100 ppm of sodium hypochlorite (NaOCl-P). No significant difference was shown in the reduction number (log CFU/cm2) of L. monocytogenes biofilms by different plasma treatment methods. However, the reduction number of E. coli O157:H7 was effective in order as NaOCl-P (3.45 log) > Direct-P (2.26 log) = NaCl-P (2.07 log) = DW-P (1.96 log). In NaOCl-P environment, the concentrations of hydroxyl radicals and peroxynitrite were the highest among the different methods of plasma treatment, indicating that these chemical species play a major role in inactivation of pathogenic bacteria in biofilms. Therefore, NaOCl-P is the optimum plasma treatment methods for inactivation of E. coli O157:H7 biofilms formed on stainless steel. In addition, the merit of using lower concentration of NaOCl than typical practice in industry can be achieved.