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Author(s): I. B. Gomes
L. C. Simões
M. Simões
Title: The effects of sodium hypochlorite against selected drinking water-isolated bacteria in planktonic and sessile states
Issue Date: 2016
Abstract: Chlorine is the most commonly used agent for general disinfection, particularly for microbial growth control indrinking water distribution systems. The goals of this study were to understand the effects of chlorine, as sodiumhypochlorite (NaOCl), on bacterial membrane physicochemical properties (surface charge, surface tension andhydrophobicity) and on motility of two emerging pathogens isolated from drinking water, Acinetobactercalcoaceticus and Stenotrophomonas maltophilia. The effects of NaOCl on the control of single and dual-speciesmonolayer adhered bacteria (2 h incubation) and biofilms (24 h incubation) was also assessed. NaOCl causedsignificant changes on the surface hydrophobicity and motility of A. calcoaceticus, but not of S. maltophilia.Planktonic and sessile S. maltophilia were significantly more resistant to NaOCl than A. calcoaceticus. Monolayeradhered co-cultures of A. calcoaceticus-S. maltophilia were more resilient than the single species. Oppositely,dual species biofilms were more susceptible to NaOCl than their single species counterparts. In general, biofilmremoval and killing demonstrated to be distinct phenomena: total bacterial viability reduction was achievedeven if NaOCl at the higher concentrations had a reduced removal efficacy, allowing biofilm reseed. In conclusion,understanding the antimicrobial susceptibility of microorganisms to NaOCl can contribute to the design ofeffective biofilm control strategies targeting key microorganisms, such as S. maltophilia, and guarantying safeand high-quality drinking water. Moreover, the results reinforce that biofilms should be regarded as chroniccontaminants of drinking water distribution systems and accurate methods are needed to quantify their presenceas well as strategies complementary/alternative to NaOCl are required to effectively control the microbiologicalquality of drinking water.
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/European Research Area networks/INN-INDIGO/0001/2014/Tecnologias económicas para controlo de (bio)fouling em membranas através da otimização de métodos de pré-tratamentos de limpeza/POMACEA
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/UID/EQU/00511/2013 - POCI-01-0145-FEDER-006939/Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia/LEPABE
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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