scholarly journals Effects of chlorine and hydrogen peroxide sanitation in low bacterial content water on biofilm formation model of poultry brooding house waterlines

2017 ◽  
Vol 96 (7) ◽  
pp. 2145-2150 ◽  
Author(s):  
P. Maharjan ◽  
G. Huff ◽  
W. Zhang ◽  
S. Watkins
Keyword(s):  
Hydrogen Peroxide ◽  
Biofilm Formation ◽  
Formation Model ◽  
Bacterial Content

Hormones modulate Candida vaginal isolates biofilm formation and decrease their susceptibility to azoles and hydrogen peroxide

2019 ◽  
Vol 58 (3) ◽  
pp. 341-350
Author(s):  
Bruna Gonçalves ◽  
Nuno Miguel Azevedo ◽  
Mariana Henriques ◽  
Sónia Silva
Keyword(s):  
Hydrogen Peroxide ◽  
Candida Albicans ◽  
Biofilm Formation ◽  
Candida Glabrata ◽  
The Other ◽  
Environmental Cues ◽  
Intrauterine Devices ◽  
Normal Cycle ◽  
Acidic Conditions ◽  
High Adaptation

Abstract Vulvovaginal candidiasis (VVC) is an infection usually caused by Candida albicans and increasingly by Candida glabrata, which has an intrinsically high resistance to commonly used antifungals. Candida species possess virulence factors that contribute to VVC development, as the ability to form biofilms in vaginal walls and intrauterine devices. It is known that VVC is promoted by conditions that increase the hormones levels, during pregnancy, however, the effects of hormones on Candida cells are poorly studied, especially in C. glabrata. Thus, the influence of progesterone and β-estradiol, at normal cycle and pregnancy concentrations, on biofilm formation and resistance of C. albicans and C. glabrata vaginal isolates, was analyzed using acidic conditions (pH 4). Biofilms of C. albicans developed in the presence of hormones presented reduced biomass (up to 65%) and impaired cells ability to produce filamentous forms. On the other hand, C. glabrata presented high adaptation to the presence of hormones, which did not affect its biofilm formation. Additionally, hormones impaired the susceptibility of C. albicans and C. glabrata cells to azoles, with potential clinical significance in the presence of pregnancy hormone levels. A similar result was obtained for the susceptibility to hydrogen peroxide, a biological vaginal barrier against Candida growth. Overall, the results of this study suggest that hormones may act as environmental cues promoting Candida protection from vaginal defenses and harmful conditions, what may have implications in Candida vaginal pathogenicity and treatment of VVC, especially in C. glabrata infections due to its high adaptability to vaginal conditions.

scholarly journals Resistance of Pseudomonas aeruginosa to Liquid Disinfectants on Contaminated Surfaces before Formation of Biofilms

2000 ◽  
Vol 83 (6) ◽  
pp. 1415-1422 ◽  
Author(s):  
Jose-Luis Sagripanti ◽  
Aylin Bonifacino
Keyword(s):  
Hydrogen Peroxide ◽  
Pseudomonas Aeruginosa ◽  
Sodium Hypochlorite ◽  
Peracetic Acid ◽  
Biofilm Formation ◽  
Step Method ◽  
Quantitative Test ◽  
Viable Bacteria ◽  
One Step ◽  
Respective Product

Abstract A comparison was made of the effectiveness of popular disinfectants (Cavicide, Cidexplus, Clorox, Exspor, Lysol, Renalin, and Wavicide) under conditions prescribed for disinfection in the respective product labels on Pseudomonas aeruginosa either in suspension or deposited onto surfaces of metallic or polymeric plastic devices. The testing also included 7 nonformulated germicidal agents (glutaraldehyde, formaldehyde, peracetic acid, hydrogen peroxide, sodium hypochlorite, phenol, and cupric ascorbate) commonly used in disinfection and decontamination. Results showed that P. aeruginosa is on average 300-fold more resistant when present on contaminated surfaces than in suspension. This increase in resistance agrees with results reported in studies of biofilms, but unexpectedly, it precedes biofilm formation. The surface to which bacteria are attached can influence the effectiveness of disinfectants. Viable bacteria attached to devices may require dislodging through more than a one-step method for detection. The data, obtained with a sensitive and quantitative test, suggest that disinfectants are less effective on contaminated surfaces than generally acknowledged.

Controlling biofilm formation by hydrogen peroxide and silver combined disinfectant

2000 ◽  
Vol 42 (1-2) ◽  
pp. 187-192 ◽  
Author(s):  
R. Armon ◽  
N. Laot ◽  
O. Lev ◽  
H. Shuval ◽  
B. Fattal
Keyword(s):  
Hydrogen Peroxide ◽  
Catalase Activity ◽  
Biofilm Formation ◽  
Prolonged Exposure ◽  
Film Growth ◽  
Silver Ions ◽  
Continuous Operation ◽  
Biofilm Growth ◽  
Biofilm Development ◽  
Biofilm Prevention

Controlling biofilm growth in drinking and wastewater pipelines has attracted considerable scientific and technological attention over recent years. In this work, we have examined the biofilm control effectivity of a combined disinfectant comprised of hydrogen peroxide and silver ions. The performance of the combined disinfectant was compared to the effectivity of each of the ingredients alone and to the effectivity of chlorine disinfectant. Biofilm growth was investigated on uncoated and CaCO3 coated galvanized iron samples over prolonged exposure duration. It was found that the CaCO3 film does not significantly affect biofilm development. A combination of hydrogen peroxide and silver ions (30 ppm hydrogen peroxide and 30 ppb silver ions) were as effective in preventing film growth as hydrogen peroxide alone (30 ppm). Both compositions showed significant biofilm prevention effectivity as compared to silver ions alone. Biofilm prevention effectivity of chlorine (approximately 1 ppm) was considerably higher than that of the combined disinfectant. The bacteria that survived after 48 hours disinfection with hydrogen peroxide and the combined disinfectant showed high catalase activity hinting that hydrogen peroxide and the combined disinfectant may have a rather limited effectivity in continuous operation.

scholarly journals Antisense yycG modulates the susceptibility of Staphylococcus aureus to hydrogen peroxide via the sarA

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Shizhou Wu ◽  
Yunjie Liu ◽  
Lei Lei ◽  
Hui Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Staphylococcus Aureus ◽  
Animal Models ◽  
Antisense Rna ◽  
Biofilm Formation ◽  
Antimicrobial Treatment ◽  
Promoter Regions ◽  
Infectious Pathogen

Abstract Background The infectious pathogen Staphylococcus aureus (S. aureus) is primarily associated with osteomyelitis. Hydrogen peroxide drainage is an effective antimicrobial treatment that has been adopted to combat S. aureus infections. Previous investigations have indicated that the antisense RNA (asRNA) strategy negatively modulates S. aureus YycFG TCS, and it significantly disrupts biofilm formation. However, the effects of the antisense yycG RNA (ASyycG) strategy on the susceptibility of biofilm-producing S. aureus to hydrogen peroxide and the mechanisms underlying this effect have not been elucidated to date. Results Overexpression of ASyycG inhibited the transcription of biofilm formation-related genes, including sarA and icaA. Additionally, the CFU counts and the live bacterial ratios of ASyycG biofilm-producing S. aureus treated with H2O2 were notably reduced across the groups. Notably, the predicted promoter regions of the sarA and icaA genes were directly regulated by YycF. Conclusions ASyycG was observed to sensitize biofilm-producing S. aureus to H2O2 intervention synergistically via the sarA and thus may represent a supplementary strategy for managing osteomyelitis. However, future in-depth studies should attempt to replicate our findings in animal models, such as the rat osteomyelitis model.

scholarly journals Influence of Hydrogen Peroxide on Disinfection and Soil Removal during Low-Temperature Household Laundry

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 195
Author(s):  
Petra Forte Tavčer ◽  
Katja Brenčič ◽  
Rok Fink ◽  
Brigita Tomšič
Keyword(s):  
Hydrogen Peroxide ◽  
Tensile Strength ◽  
Low Temperature ◽  
Biofilm Formation ◽  
Pathogenic Bacteria ◽  
Soil Removal ◽  
Colour Change ◽  
Raw Material ◽  
Washing Machine ◽  
Liquid Detergent

In the Water, Energy and Waste Directive, the European Commission provides for the use of household washing programmes with lower temperatures (30–40 °C) and lower water consumption. However, low washing temperatures and the absence of oxidising agents in the liquid detergents, and their reduced content in powder detergents, allow biofilm formation in washing machines and the development of an unpleasant odour, while the washed laundry can become a carrier of pathogenic bacteria, posing a risk to human health. The aim of the study was to determine whether the addition of hydrogen peroxide (HP) to liquid detergents in low-temperature household washing allows disinfection of the laundry without affecting the properties of the washed textiles even after several consecutive washes. Fabrics of different colours and of different raw material compositions were repeatedly washed in a household washing machine using a liquid detergent with the addition of 3% stabilised HP solution in the main wash, prewash or rinse. The results of the antimicrobial activity, soil removal activity, colour change and tensile strength confirmed the excellent disinfection activity of the 3% HP, but only if added in the main wash. Its presence did not discolour nor affect the tensile strength of the laundry, thus maintaining its overall appearance.

In-office bleaching gel with 35% hydrogen peroxide enhanced biofilm formation of early colonizing streptococci on human enamel

2014 ◽  
Vol 42 (11) ◽  
pp. 1480-1486 ◽  
Author(s):  
Suttinee Ittatirut ◽  
Oranart Matangkasombut ◽  
Panida Thanyasrisung
Keyword(s):  
Hydrogen Peroxide ◽  
Biofilm Formation ◽  
Human Enamel
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