scholarly journals Influence of incubation conditions on biofilm formation by Pseudomonas fluorescens isolated from dairy products and dairy manufacturing plants

2016 ◽  
Vol 5 (3) ◽  
Author(s):  
Chiara Rossi ◽  
Clemencia Chaves-López ◽  
Annalisa Serio ◽  
Elisa Goffredo ◽  
Beniamino Terzo Cenci Goga ◽  
...  
Keyword(s):  
Low Temperature ◽  
Pseudomonas Fluorescens ◽  
Incubation Time ◽  
Food Processing ◽  
Biofilm Formation ◽  
Dairy Products ◽  
Great Variability ◽  
Manufacturing Plants ◽  
Cleaning And Disinfection ◽  
Strain Dependent

In this study, biofilm formation of 64 <em>Pseudomonas fluorescens</em> strains isolated from milk, dairy products and dairy plants was compared. The strains were grown on Tryptic Soy Broth supplemented with 0.2% of glucose, on polystyrene microplates at 10 and 30°C for 48 h. In general, 57/64 <em>P. fluorescens</em> strains formed biofilm, although with great variability at both tested temperatures. Moreover, our results evidenced that the biofilm-forming ability of the strains was temperature- and strain-dependent. Interestingly, the ability of several isolates to form biofilms was associated with the low temperature after 48 h. Our findings evidenced that temperature was more important than incubation time for biofilm formation. Considering the origin of the strains, it is relevant to underline the importance of performing accurate cleaning and disinfection procedures on food processing surfaces.

scholarly journals Coaggregation between Rhodococcus and Acinetobacter strains isolated from the food industry

2015 ◽  
Vol 61 (7) ◽  
pp. 503-512 ◽  
Author(s):  
Trond Møretrø ◽  
Shahab Sharifzadeh ◽  
Solveig Langsrud ◽  
Even Heir ◽  
Alexander H. Rickard
Keyword(s):  
Food Processing ◽  
Biofilm Formation ◽  
Food Industry ◽  
Stationary Phases ◽  
Acinetobacter Calcoaceticus ◽  
Proteinase K ◽  
Late Stationary Phase ◽  
Proteinase K Treatment ◽  
Cleaning And Disinfection ◽  
Rhodococcus Sp

In this study, coaggregation interactions between Rhodococcus and Acinetobacter strains isolated from food-processing surfaces were characterized. Rhodococcus sp. strain MF3727 formed intrageneric coaggregates with Rhodococcus sp. strain MF3803 and intergeneric coaggregates with 2 strains of Acinetobacter calcoaceticus (MF3293, MF3627). Stronger coaggregation between A. calcoaceticus MF3727 and Rhodococcus sp. MF3293 was observed after growth in batch culture at 30 °C than at 20 °C, after growth in tryptic soy broth than in liquid R2A medium, and between cells in exponential and early stationary phases than cells in late stationary phase. The coaggregation ability of Rhodococcus sp. MF3727 was maintained even after heat and Proteinase K treatment, suggesting its ability to coaggregate was protein independent whereas the coaggregation determinants of the other strains involved proteinaceous cell-surface-associated polymers. Coaggregation was stable at pH 5–9. The mechanisms of coaggregation among Acinetobacter and Rhodococcus strains bare similarity to those displayed by coaggregating bacteria of oral and freshwater origin, with respect to binding between proteinaceous and nonproteinaceous determinants and the effect of environmental factors on coaggregation. Coaggregation may contribute to biofilm formation on industrial food surfaces, protecting bacteria against cleaning and disinfection.

scholarly journals Biofilm Formation by Shiga Toxin-Producing Escherichia coli on Stainless Steel Coupons as Affected by Temperature and Incubation Time

2019 ◽  
Vol 7 (4) ◽  
pp. 95 ◽  
Author(s):  
Zhi Ma ◽  
Emmanuel W. Bumunang ◽  
Kim Stanford ◽  
Xiaomei Bie ◽  
Yan D. Niu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Stainless Steel ◽  
Shiga Toxin ◽  
Incubation Time ◽  
Food Processing ◽  
Biofilm Formation ◽  
Crystal Violet Staining ◽  
Plate Counts ◽  
Air Liquid Interface ◽  
Over Time

Forming biofilm is a strategy utilized by Shiga toxin-producing Escherichia coli (STEC) to survive and persist in food processing environments. We investigated the biofilm-forming potential of STEC strains from 10 clinically important serogroups on stainless steel at 22 °C or 13 °C after 24, 48, and 72 h of incubation. Results from crystal violet staining, plate counts, and scanning electron microscopy (SEM) identified a single isolate from each of the O113, O145, O91, O157, and O121 serogroups that was capable of forming strong or moderate biofilms on stainless steel at 22 °C. However, the biofilm-forming strength of these five strains was reduced when incubation time progressed. Moreover, we found that these strains formed a dense pellicle at the air-liquid interface on stainless steel, which suggests that oxygen was conducive to biofilm formation. At 13 °C, biofilm formation by these strains decreased (P < 0.05), but gradually increased over time. Overall, STEC biofilm formation was most prominent at 22 °C up to 24 h. The findings in this study identify the environmental conditions that may promote STEC biofilm formation in food processing facilities and suggest that the ability of specific strains to form biofilms contributes to their persistence within these environments.

Biofilm Formation and Associated Genes in Listeria Monocytogenes

2017 ◽  
Vol 12 (3) ◽  
Author(s):  
S. R. Warke ◽  
V. C. Ingle ◽  
N. V. Kurkure ◽  
P. A. Tembhurne ◽  
Minakshi Prasad ◽  
...  
Keyword(s):  
Public Health ◽  
Listeria Monocytogenes ◽  
Multiplex Pcr ◽  
Food Processing ◽  
Biofilm Formation ◽  
Milk Samples ◽  
Biofilm Production ◽  
Food Borne ◽  
Serious Infections ◽  
Microtiter Assay

Listeria monocytogenes, an opportunistic food borne pathogen can cause serious infections in immunocompromised individuals. L. monocytogenes is capable of producing biofilm on the surface of food processing lines and instruments.The biofilm transfers contamination to food products and impose risk to public health. In the present study biofilm producing ability of L. monocytogenes isolates were investigated phenotypically and genotypically by microtiter assay and multiplex PCR, respectively. Out of 38 L. monocytogenes isolates 14 were recovered from animal clinical cases, 12 bovine environment and 12 from milk samples. A total of 3 (21.42%) clinical, 2 (16.66%) environment and 3 (25%) milk samples respectively, revealed biofilm production in microtiter assay. Cumulative results showed that 23 (60.52%) out of 38 strains of L. monocytogenes were positive for luxS and flaA gene and 1 (2.63%) was positive only for the flaA gene.

Prevention of biofilm formation by dairy products and N-Acetylcysteine on voice prostheses in an artificial throat

2004 ◽  
Vol 124 (6) ◽  
pp. 726-731 ◽  
Author(s):  
Leonora Q. Schwandt ◽  
Ranny Van Weissenbruch ◽  
Ietse Stokroos ◽  
Henny C. Van Der Mei ◽  
Henk J. Busscher ◽  
...  
Keyword(s):  
Biofilm Formation ◽  
Dairy Products ◽  
Voice Prostheses

scholarly journals Biofilm Forming Ability and Antibiotic Susceptibility of Food-borne Pathogens Isolated from Common Dairy Products: Madara and Nono Vended in Makurdi Metropolis

2020 ◽  
pp. 74-83
Author(s):  
Amina Ojochide Hassan ◽  
Innocent Okonkwo Ogbonna ◽  
Victor Ugochukwu Obisike
Keyword(s):  
Antibiotic Susceptibility ◽  
Biofilm Formation ◽  
Dairy Products ◽  
Cow Milk ◽  
Health Concern ◽  
Diffusion Method ◽  
Food Borne Pathogens ◽  
Food Borne ◽  
Wide Range ◽  
Multiple Antibiotics

Microbial resistance to antibiotics and biofilm formation ability of food-borne pathogens are major global health challenges. Most milk and milk products (Madara and Nono) could be vehicles for the transmission of multidrug resistant genes among any community. This study was aimed at determining the antibiotic susceptibility patterns and biofilm forming ability of some food-borne pathogens isolated from common dairy products: Madara and Nono in Makurdi metropolis. Two hundred and forty (240) samples comprising of one hundred and twenty (120) each of Madara (fresh raw milk from cow “FRM”)) and Nono (chance fermented cow milk “CFM”) were examined for the presence of pathogens. Antibiogram of bacterial isolates (Staphylococcus aureus, Escherichia coli, Shigella spp., Salmonella spp. and Klebsiella spp.) using the disc diffusion method revealed that susceptibility for Ampicillin (86.9%), Streptomycin (83.9%) and Ciprofloxacin (75.0%). Resistance was shown (26.7%) to Nalidixic acid, a commonly used antibiotic reflecting a public health concern. Most resistant isolates had a multiple antibiotics index of 0.3 (27.54%) with a least multiple antibiotics resistance index of 0.6 (0.85%). Detection of biofilm formation of isolates was done by Tube method. The study also revealed that out the total of 236 isolates tested for biofilm formation, 67 (28.4%) isolates were non or weak biofilm producers, 77 (32.6%) isolates were moderate biofilm producers and 92 (39%) isolates were strong biofilm producers. Findings of this research show high presence of a wide range of microorganisms, particularly enteric pathogens and enterotoxigenic strains of S. aureus which portrayed multidrug resistance and biofilm formation suggesting that FRM (Madara) and CRM (Nono) products might be important sources of food-borne infections and intoxication.

scholarly journals Disruption of de novo purine biosynthesis in Pseudomonas fluorescens Pf0-1 leads to reduced biofilm formation and a reduction in cell size of surface-attached but not planktonic cells

2015 ◽  
Author(s):  
Shiro Yoshioka ◽  
Peter D Newell
Keyword(s):  
Pseudomonas Fluorescens ◽  
Cell Size ◽  
Biofilm Formation ◽  
De Novo ◽  
Purine Biosynthesis ◽  
Model Organisms ◽  
Purine Nucleotides ◽  
Surface Attachment ◽  
Nucleotide Biosynthesis ◽  
Mutant Cells

Pseudomonas fluorescens Pf0-1 is one of the model organisms for biofilm research. Our previous transposon mutagenesis study suggested a requirement for the de novo purine nucleotide biosynthesis pathway for biofilm formation by this organism. This study was performed to verify that observation and investigate the basis for the defects in biofilm formation shown by purine biosynthesis mutants. Constructing deletion mutations in 8 genes in this pathway, we found that they all showed reductions in biofilm formation that could be partly or completely restored by nucleotide supplementation or genetic complementation. We demonstrated that, despite a reduction in biofilm formation, more viable mutant cells were recovered from the surface-attached population than from the planktonic phase under conditions of purine deprivation. Analyses using scanning electron microscopy revealed that the surface-attached mutant cells were 25~30% shorter in length than WT, which partly explains the reduced biomass in the mutant biofilms. The laser diffraction particle analyses confirmed this finding, and further indicated that the WT biofilm cells were smaller than their planktonic counterparts. The defects in biofilm formation and reductions in cell size shown by the mutants were fully recovered upon adenine or hypoxanthine supplementation, indicating that the purine shortages caused reductions in cell size. Our results are consistent with surface attachment serving as a survival strategy during nutrient deprivation, and indicate that changes in the cell size may be a natural response of P. fluorescens to growth on a surface. Finally, cell sizes in WT biofilms became slightly smaller in the presence of exogenous adenine than in its absence. Our findings suggest that purine nucleotides or related metabolites may influence the regulation of cell size in this bacterium.

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