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首页> 外文期刊>Biocontrol Science >Biofilm-Forming Activity of Bacteria Isolated from Toilet Bowl Biofilms and the Bactericidal Activity of Disinfectants against The Isolates
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Biofilm-Forming Activity of Bacteria Isolated from Toilet Bowl Biofilms and the Bactericidal Activity of Disinfectants against The Isolates

机译：从抽水马桶生物膜分离的细菌的生物膜形成活性和消毒剂对分离物的杀菌活性

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摘要

To evaluate the sanitary conditions of toilets, the bacterial counts of the toilet bowl biofilms in 5 Kansai area and 11 Kansai and Kanto area homes in Japan were measured in winter and summer seasons, respectively. Isolates (128 strains) were identified by analyzing 16S ribosomal RNA sequences. The number of colonies and bacterial species from biofilms sampled in winter tended to be higher and lower, respectively, than those in summer. Moreover, the composition of bacterial communities in summer and winter samples differed considerably. In summer samples, biofilms in Kansai and Kanto areas were dominated by Blastomonas sp. and Mycobacterium sp., respectively. Methylobacterium sp. was detected in all toilet bowl biofilms except for one sample. Methylobacterium sp. constituted the major presence in biofilms along with Brevundimonas sp., Sphingomonas sp., and/or Pseudomonas sp. The composition ratio of the sum of their genera was 88.0 from 42.9% of the total bacterial flora. The biofilm formation abilities of 128 isolates were investigated, and results suggested that Methylobacterium sp. and Sphingomonas sp. were involved in biofilm formation in toilet bowls. The biofilm formation of a mixed bacteria system that included bacteria with the highest biofilm-forming ability in a winter sample was greater than mixture without such bacteria. This result suggests that isolates possessing a high biofilm-forming activity are involved in the biofilm formation in the actual toilet bowl. A bactericidal test against 25 strains indicated that the bactericidal activities of didecyldimethylammonium chloride (DDAC) tended to be higher than those of polyhexamethylene biguanide (PHMB) and N-benzyl-N,N-dimethyldodecylammonium chloride (ADBAC). In particular, DDAC showed high bactericidal activity against approximately 90% of tested strains under the 5 h treatment.
机译：为了评估厕所的卫生状况，分别在冬季和夏季测量了日本5个关西地区以及11个关西和关东地区房屋中的便池生物膜细菌数。通过分析16S核糖体RNA序列鉴定出分离株（128个菌株）。冬季采样的生物膜上的菌落数量和细菌数量分别比夏季更高和更低。此外，夏季和冬季样品中细菌群落的组成差异很大。在夏季样本中，关西和关东地区的生物膜主要由Blastomonas sp。引起。和分枝杆菌属。甲基杆菌属除一个样本外，在所有抽水马桶的生物膜中都检测到甲基杆菌属与短杆菌属，鞘氨醇单胞菌属和/或假单胞菌属一起构成生物膜中的主要存在。从属细菌总数的42.9％，其属的总和的组成比为88.0。研究了128株分离物的生物膜形成能力，结果表明甲基杆菌属。和鞘氨醇单胞菌。参与了马桶中生物膜的形成。包括冬季样本中具有最高生物膜形成能力的细菌在内的混合细菌系统的生物膜形成要大于不含这种细菌的混合物的生物膜形成。该结果表明，在实际的马桶中，具有高生物膜形成活性的分离物参与生物膜的形成。对25个菌株的杀菌试验表明，二癸基二甲基氯化铵（DDAC）的杀菌活性倾向于高于聚六亚甲基双胍（PHMB）和N-苄基-N，N-二甲基十二烷基氯化铵（ADBAC）。特别地，在5小时的处理下，DDAC对约90％的测试菌株显示出高杀菌活性。

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