Evaluation of oxidising disinfectants to control Vibrio biofilms in treated seawater used for fish processing

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dc.contributor.author Shikongo-Nambabi, Martha Naita Namwaala Nangulohi
dc.contributor.author Kachigunda, B.
dc.contributor.author Venter, S.N. (Stephanus Nicolaas)
dc.date.accessioned 2010-05-28T11:18:51Z
dc.date.available 2010-05-28T11:18:51Z
dc.date.issued 2010-04
dc.description.abstract Marine fish-processing plants often use seawater during their operations. Chlorination and UV are commonly used for disinfection of this water but may not be effective in preventing biofilm formation within the water distribution network. These biofilms negatively impact water quality and could lead to contamination of fish products. During a recent study, Vibrio alginolyticus strains were detected on processed hake. The presence of most Vibrio spp. on fish products is of consumer safety concern and needs to be minimised. Water treatment strategies effective for seawater disinfection but with minimal negative effect on fish quality are required. In this study the effectiveness of chlorine, ozone and hydrogen peroxide (H2O2) in the inhibition of mature biofilms or biofilm formation in natural seawater was investigated. Two V. alginolyticus strains (V590 and V595) isolated from hake fish as well as the type strains of V. alginolyticus LMG 4409 and V. parahaemolyticus LMG 2850 were used. Chlorine was ineffective as experiments showed that strains V590, V595 and V. parahaemolyticus LMG 2850 could form biofilms even in the presence of 4 mg/ℓ of chlorine. When ozone was used, biofilm initiation and formation were completely inhibited for only 2 strains of V. alginoluticus, i.e. LMG 4409 and V590, at 1.6 mg/ℓ or 0.8 mg/ℓ ozone, respectively. Hydrogen peroxide performed the best of all the disinfectants evaluated in this study. Inhibition of biofilm formation was observed for all strains at 0.05% H2O2. The mature biofilms were more resistant to H2O2 but were all eliminated at 0.2% concentrations. This study indicated that H2O2 is the most effective biocide to prevent biofilm formation in seawater distribution networks and could potentially be used as an alternative or supplementary disinfectant of seawater in marine fish-processing plants. en
dc.identifier.citation Shikongo-Nambabi, MNNN, Kachigunda, B & Venter, SN 2010, 'Evaluation of oxidising disinfectants to control Vibrio biofilms in treated seawater used for fish processing', Water SA, vol. 36, no. 3, pp. 215-220. [http://www.wrc.org.za] en
dc.identifier.issn 0378-4738
dc.identifier.uri http://hdl.handle.net/2263/14151
dc.language.iso en en_US
dc.publisher Water Research Council en_US
dc.rights Water Research Council en_US
dc.subject V. alginolyticus en
dc.subject V. parahaemolyticus en
dc.subject.lcsh Biofilms en
dc.subject.lcsh Vibrio parahaemolyticus en
dc.subject.lcsh Vibrionaceae en
dc.subject.lcsh Seawater en
dc.subject.lcsh Disinfection and disinfectants en
dc.subject.lcsh Water -- Purification -- Chlorination en
dc.subject.lcsh Oxidizing agents en
dc.subject.lcsh Fishery processing en
dc.subject.lcsh Fisheries -- Hydrologic factors en
dc.subject.lcsh Water quality management en
dc.subject.lcsh Microbial contamination en
dc.subject.lcsh Fishery products -- Spoilage en
dc.title Evaluation of oxidising disinfectants to control Vibrio biofilms in treated seawater used for fish processing en
dc.type Article en


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