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Tuesday, July 28, 2020 | History

2 edition of Efficacy of industrial biocides against bacterial biofilms found in the catalog.

Efficacy of industrial biocides against bacterial biofilms

Richard James Taylor

Efficacy of industrial biocides against bacterial biofilms

by Richard James Taylor

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  • 14 Currently reading

Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D) - University of Birmingham, School of Chemical Engineering, Faculty of Engineering, 1996.

Statementby Richard James Taylor.
ID Numbers
Open LibraryOL17229007M

Biofilms provide shelter for bacteria against conventional biocides, such as bleach and other toxic biocides. Current chemical and mechanical treatments are inadequate for remediating industrial biofilms due to a combination of environmental toxicity, corrosiveness and poor anti-biofilm efficacy. entrapped in alginate gel beads to form artificial biofilms resisted killing by chlorine, glutaraldehyde, 2,2-dibromonitrilopropionamide (DBNPA), and an alkyl dimethyl benzyl ammonium compound (ADBAC). The degree of resistance was quantified by a resistance factor that compared killing times for biofilm and planktonic cells in response to the same concentration of antimicrobial agent.

A model cooling tower system was experimentally seeded with Legionella pneumophila and real industrial cooling tower (CT) water has been run at the closest to full-scale system operating conditions. The water/biofilm samples were taken from the model system monthly, and the effectiveness of the different concentrations of Chloramine T trihydrate biocide was evaluated in terms of its ability to. Chloromethyl-methylisothiazolone (CMIT/MIT) biocide [email protected] for microbial control [email protected] industrial water treatment applications. [email protected]@effective versus various types of bacteria, algae and fungi. This paper will provide results of planktonic and biofilm efficacy studies with CMIT/MIT biocide versus various strains of Desulfovibrio.

Results of several years laboratory experience with biocides in the presence of bacterial biofilms on metal surfaces are reported. Planktonic growth and biofilms of Pseudomonas sp. and Pseudomonas fluorescens, were used to assess the biocidal efficacy of glutaraldehyde, formaldehyde, ammonium didecyldimethyl chloride, an isothiazolinones mixture, ozone and sodium hypochlorite.   The new bead assay for biofilms is a robust, quick and cost-effective method for assessing the efficacy of biocides against biofilms. Discover the world's research 17+ million members.


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Efficacy of industrial biocides against bacterial biofilms by Richard James Taylor Download PDF EPUB FB2

Bacteria within biofilms are up to 1, times more resistant to antimicrobials than are the same bacteria in suspension Although new decontamination methods are being investigated for removing biofilms, chlorine and monochloramines can effectively inactivate biofilm bacteria   Biocidal efficacy Efficacy of industrial biocides against bacterial biofilms book monochloramine against biofilm bacteria.

Biofoul – de Mele, M. and Videla H. A., a. Use of dissolved ozone for controlling planktonic and sessile bacteria in industrial cooling systems. Wingender J., Flemming HC. () Efficacy of biocides against biofilms.

In: Paulus W. (eds) Directory of. Efficacy of biocides against biofilms. Industrial biofilms are quite diverse and knowledge gained with a certain type of biofilm may not be applicable to others.

Bacterial biofilm is a. The method describes how to measure the efficacy of biocides against biofilm encased bacteria, using liquid or water-soluble powder formulations against bacterial biofilm.

The method involves the growth of a biofilm using a CDC reactor, using standard methods ASTM E for quantifying Pseudomonas aeruginosa, and E to evaluate the. Journals & Books; Help Download PDF Download. Share. Export. Advanced. Comparative Immunology, Microbiology and Infectious Diseases.

Vol AugustPages Efficacy of selected biocides in the decontamination of common nosocomial bacterial pathogens in biofilm Cited by: 3.

This investigation demonstrated a broad-spectrum bactericidal efficacy of three of the assayed biocides (MT and both naphthoquinone derivatives) at low use levels, also against naturally tolerant species, such as Pseudomonas spp. MT was the most effective, inhibiting bacterial growth of both Gram-positive (MIC.

So knowing that a biofilm is a problem surely biocides can be added that will penetrate the biofilm and kill these problematic bacteria. Studies have shown that biocides can have difficulty penetrating biofilms leading to bacteria surviving the addition of a biocide to a system such as a hot tub, cooling system, domestic hot and cold water.

Introduction. Chemical biocides have been used for centuries, originally for food and water preservation, although there are early accounts of their use for wound management (Lister ; Craig ; Semmelweis ).A clear landmark in the use of biocides in the healthcare setting was the advent of antisepsis and the use of chlorine water in the early 19th century (Rotter).

In this study, it was shown that with the combined application of direct current electric fields of about to 20 V/cm 2 (current densities of about 15 × 10 −6 to × 10 −3 A/cm 2) and tobramycin, the concentration of antimicrobial needed to exhibit activity against biofilm bacteria fell out to times compared to that needed.

MB Growing a Biofilm using the CDC Biofilm Reactor. This method describes how to develop reproducible biofilms on coupons within a turbulent flow reactor.

MB Single Tube Method for Determining the Efficacy of Disinfectants against Bacterial Biofilms. This method describes how to measure the efficacy of biocides against biofilm encased. A Radio Frequency Electric Current Enhances Antibiotic Efficacy against Bacterial Biofilms.

or the production and transport of additional biocide ions into the biofilm by an electrophoretic process Bacterial polysaccharides from industrial environments, p. In J. Wimpenny. Bott TR () Biofilms in process and industrial waters: the biofilm ecology of microbial bio-fouling, biocide resistance and corrosion.

In: Keevil CW, Godfree A, Holt D, Dow C (eds.) Biofilms in the aquatic environment. Royal Society of Chemistry, London pp. 80–92 Google Scholar.

In biofilm control, NEOW and CD were the most efficient biocides causing and log CFUcm − 2 reduction, respectively. In terms of stability for chlorine depletion, NEOW had the longest decay time for chlorine loss (70 days at 5 °C) and the lowest chlorine loss rate ( ppmmin −.

The enhancement of biocide efficacy was therefore not dependent on the conditions (presence or absence of an EF-CD)underwhichthe biofilm wasestablished. The final set of experiments was performed to demon-strate the relative contributions of the EF-CD and biocide (glutaraldehyde orquatemaryammoniumcompound)to the overall effect.

Findings. Biofilm viability was reduced by log 10 for the chlorine-based products and by 2 log 10 for Proxitane, but these products failed to kill any biofilm in the presence of soil.

In contrast, Surfex completely inactivated biofilm ( log 10 reduction in titre) in the presence of soil. H 2 O 2 products had little effect against DSB. Biofilm mass removed in the presence and absence of.

Biofilms growing in natural and industrial environments are resistant to bacteriophage, to amoebae, and to the chemically diverse biocides used to combat biofouling in industrial processes. Of importance with respect to medicine, sessile bacterial cells can withstand host immune responses, and they are much less susceptible to antibiotics than.

Relevance of Biofilms in the Food Industry and Disinfection Hurdles. Biofilm formation is a major concern in industrial settings, since it is one of the causes of operating troubles by decreasing heat transfer, blocking tubes, plugging filters, and causing damage to surfaces (Myszka and Czaczyk, ).Specifically in the food industry, the ability of bacteria to attach to food-contact surfaces.

Fogging effectiveness for COVID Currently, fogging (alone) does not meet the CDC guidelines for COVID prevention protocol, as it does not require surfaces to be pre-cleaned.

For the treatment of this specific virus, fogging should be considered an. in reducing the bacterial activity of the biofilm. The biocide proved to be more effective for longer exposure times. GT A showed good antimicrobial activity against P. fluorescens in suspension, with higher activity at pH 9.

The findings of this study suggest that when GT A is used to control biofilms, it reacts with one of the components of.

AIM: To compare the influence and clearance effect of enzymatic and non-enzymatic detergents against Escherichia coli (E. coli) biofilm on the inner surface of gastroscopes. METHODS: Teflon tubes were incubated in a mixture of different detergents and E.

coli culture (10 6 CFU/mL) for 72 h at 15°C, and biofilms on the inner surface of the teflon tubes were analyzed by bacterial count and. Bacteria live primarily in microbial communities (biofilms), where they exhibit considerably higher biocide tolerance than their planktonic counterparts.

Current standardized efficacy testing protocols of disinfectants, however, employ predominantly planktonic bacteria. In order to test the efficacy of biocides on biofilms in a standardized manner, a new assay was developed and .David R. Karsa, in Handbook for Cleaning/Decontamination of Surfaces, Phenolics.

Phenolic biocides have been used since the surgeon, Lister, introduced phenol into surgical practice in Phenolic biocides are used across a wide range of applications including disinfectants, antiseptics, surgical scrubs, toilet soaps, cosmetics, etc. with the exception of food contact application.In this study, the minimal inhibition concentrations (MIC) against 18 biofilm bacteria (8 g-negative and 10 g-positive), isolated at different times from cooling waters of a petrochemical industry.