Iodine susceptibility of pseudomonads grown attached to stainless steel surfaces
作者:
BarryH Pyle,
GordonA McFeters,
期刊:
Biofouling
(Taylor Available online 1990)
卷期:
Volume 2,
issue 2
页码: 113-120
ISSN:0892-7014
年代: 1990
DOI:10.1080/08927019009378137
出版商: Taylor & Francis Group
关键词: Pseudomonads;Biofilms;Stainless steel;Iodination;Water treatment;Disinfection
数据来源: Taylor
摘要:
Pseudomonads were adapted to grow in phosphate‐buffered water and on stainless steel surfaces to study the iodine sensitivity of attached and planktonic cells. Cultures adapted to low nutrient growth were incubated at room temperature in a circulating reactor system with stainless steel coupons to allow biofilm formation on the metal surfaces. In some experiments, the reactor was partially emptied and refilled with buffer at each sampling time to simulate a “fill‐and‐draw”; water system. Biofilms of attached bacteria, resuspended bionlm bacteria, and reactor suspension, were exposed to 1 mg·l−1iodine for 2 min. Attached bacterial populations which established on coupons within 3 to 5 days displayed a significant increase in resistance to iodine. Increased resistance was also observed for resuspended cells from the biofilm and planktonic bacteria in the system suspension. Generally, intact biofilms and resuspended biofilm cells were most resistant, followed by planktonic bacteria and phosphate buffer cultures. Thus, biofilm formation on stainless steel surfaces within water systems can result in significantly increased disinfection resistance of commonly‐occurring water‐borne bacteria that may enhance their ability to colonise water treatment and distribution systems.
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