scholarly journals Garlic (Allium sativum L.) Ethanolic Extract Capability to Inhibit Pseudomonas aeruginosa Biofilm Formation

2021 ◽  
Vol 3 (1) ◽  
pp. 1-8
Author(s):  
Lisa Gosal ◽  
Suryani Hutomo ◽  
Christiane M Sooai
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Biofilm Formation ◽  
Allium Sativum ◽  
Brain Heart Infusion ◽  
Ethanolic Extract ◽  
Assay Method ◽  
Minimum Concentration ◽  
Significant Difference ◽  
Microplate Reader ◽  
One Way Anova

Garlic extract (Allium sativum L.) is known to contain substances that can inhibitbacterial adhesion. This study aims to explore the ability of garlic (Allium sativum L.) extract toinhibit the adhesion of P. aeruginosa. Ethanolic garlic (Allium sativum L.) extract was made bythe maceration method. A bacterial adherence assay was performed used the static microtiter biofilm assay method on 96-well plates. Pseudomonas aeruginosa was inoculated in added garlic(Allium sativum L.) extract to brain heart infusion (BHI) broth in various concentrations. Biofilmbacteria on wall plates were stained with 0.1% Crystal violet and were extracted using 96%,subsequently were measured using a microplate reader with absorbance at 595 nm. Decreasedoptical density value equal with increased extract concentration. Statistical analysis using One-way ANOVA revealed a significant difference in the optical density (OD) value between thegroups (p<0.05). The minimum concentration obtained in this study was 156.25 ? g/ml.Conclusion, ethanolic garlic (Allium sativum L.) extract can inhibit adherence to P. aeruginosa.Keywords: Garlic ethanolic extract; Pseudomonas aeruginosa; adherence.

scholarly journals Bicarbonate Evokes Reciprocal Changes in Intracellular Cyclic di-GMP and Cyclic AMP Levels in Pseudomonas aeruginosa

Biology ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 519
Author(s):  
Kasidid Ruksakiet ◽  
Balázs Stercz ◽  
Gergő Tóth ◽  
Pongsiri Jaikumpun ◽  
Ilona Gróf ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Cyclic Amp ◽  
Biofilm Formation ◽  
Second Messengers ◽  
Brain Heart Infusion ◽  
Ambient Air ◽  
Dependent Manner ◽  
Environmental Signals ◽  
Common Causes ◽  
Camp Levels

The formation of Pseudomonas aeruginosa biofilms in cystic fibrosis (CF) is one of the most common causes of morbidity and mortality in CF patients. Cyclic di-GMP and cyclic AMP are second messengers regulating the bacterial lifestyle transition in response to environmental signals. We aimed to investigate the effects of extracellular pH and bicarbonate on intracellular c-di-GMP and cAMP levels, and on biofilm formation. P. aeruginosa was inoculated in a brain–heart infusion medium supplemented with 25 and 50 mM NaCl in ambient air (pH adjusted to 7.4 and 7.7 respectively), or with 25 and 50 mM NaHCO3 in 5% CO2 (pH 7.4 and 7.7). After 16 h incubation, c-di-GMP and cAMP were extracted and their concentrations determined. Biofilm formation was investigated using an xCelligence real-time cell analyzer and by crystal violet assay. Our results show that HCO3− exposure decreased c-di-GMP and increased cAMP levels in a dose-dependent manner. Biofilm formation was also reduced after 48 h exposure to HCO3−. The reciprocal changes in second messenger concentrations were not influenced by changes in medium pH or osmolality. These findings indicate that HCO3− per se modulates the levels of c-di-GMP and cAMP, thereby inhibiting biofilm formation and promoting the planktonic lifestyle of the bacteria.

scholarly journals Ethanolic Allium sativum extract down-regulates the pelF gene involved in Pseudomonas aeruginosa biofilm formation

2017 ◽  
Vol 16 (12) ◽  
pp. 585-593
Author(s):  
Nyakaat Ninyio Nathaniel ◽  
Bashir Gidado Hadiza ◽  
O. Yahaya Mariama ◽  
Tayaza ◽  
A. Bamanga Raji ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Biofilm Formation ◽  
Allium Sativum

Bacterial survival and biofilm formation on conventional and antibacterial toothbrushes

Biofilms ◽  
2004 ◽  
Vol 1 (2) ◽  
pp. 123-130 ◽  
Author(s):  
R. L. Sammons ◽  
D. Kaur ◽  
P. Neal
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Staphylococcus Epidermidis ◽  
Biofilm Formation ◽  
Bacterial Survival ◽  
Opportunistic Pathogens ◽  
Mechanical Agitation ◽  
Gram Staining ◽  
Colony Forming Units ◽  
Significant Difference ◽  
Number Of Bacteria

The aim of this study was to investigate bacterial survival and biofilm formation on toothbrushes. Fifteen healthy volunteers each used a normal toothbrush and an antibacterial toothbrush of the same design for two separate 5 week periods. Bacteria were removed from the brush head by swabbing and mechanical agitation in 10ml of tryptone soya broth, cultured aerobically on selective and non-selective media, and classified by Gram staining, catalase and oxidase tests. Survival of Staphylococcus epidermidis and Pseudomonas aeruginosa was monitored in the laboratory on both types of brush over 8 days. Scanning electron microscopy was used to observe biofilm formation on antibacterial and conventional brushes used for various times. Numbers of bacteria isolated from conventional and antibacterial brushes from different individuals ranged from 8.3×103 to 4.7×106 and from 1×102 to 1.2×106 colony-forming units/ml, respectively. A larger number of bacteria were isolated from conventional brushes than from antibacterial brushes used by the same individuals but no statistically significant difference was demonstrated. No differences in the relative proportions of Gram-negative and Gram-positive rods or cocci were seen. Staphylococci, presumptive coliforms and pseudomonads were isolated from 48%, 28% and 16% of brushes, respectively. Pseudomonas aeruginosa was viable for at least 4 days on conventional, and 2–3 days on antibacterial, brushes, whilst S. epidermidis survived for 6–8 days on antibacterial and more than 8 days on conventional brushes. Biofilms formed on the heads and bristles of both conventional and antibacterial brushes. Extensive, mixed community biofilms developed after several months of use. We conclude that toothbrushes may be a reservoir of opportunistic pathogens including staphylococci and pseudomonad-like organisms and must be considered as a potential source of haematogenous infections and cross-infection.

scholarly journals Potensi kitosan kepiting rajungan (Portunus pelagicus) dalam penghambatan pembentukan biofilm Porphyromonas gingivalis dan pertumbuhan Candida albicansPotential of flower crab (Portunus pelagicus) chitosan in the inhibition of Porphyromonas gingivalis and Candida albicans biofilm

2020 ◽  
Vol 4 (2) ◽  
pp. 121
Author(s):  
Yoifah Rizka Wedarti ◽  
Laurencia Isabella Loekito ◽  
Fani Pangabdian ◽  
Dwi Andriani
Keyword(s):  
Candida Albicans ◽  
Porphyromonas Gingivalis ◽  
Optical Density ◽  
Biofilm Formation ◽  
Microtiter Plate ◽  
Control Group ◽  
Portunus Pelagicus ◽  
Biofilm Inhibition ◽  
Significant Difference ◽  
One Way Anova

Pendahuluan: Pembentukan biofilm sangat penting dalam patogenesis periodontitis. Porphyromonas gingivalis merupakan bakteri yang banyak ditemukan pada plak gigi dan memiliki kemampuan membentuk biofilm demikian juga Candida albicans memiliki faktor virulensi yang dapat membantu kolonisasi dan proliferasi bakteri di dalam poket periodontal. Ekstrak kitosan kepiting rajungan (Portunus pelagicus) mempunyai potensi antimikrobial yang dapat digunakan sebagai alternatif terapi. Tujuan penelitian ini adalah untuk menganalisis potensi kitosan kepiting rajungan (Portunus pelagicus) dalam penghambatan biofilm Porphyromonas gingivalis dan Candida albicans. Metode: Jenis penelitian adalah eksperimental murni. Penelitian ini menggunakan ekstrak kitosan kepiting rajungan (Portunus pelagicus) terhadap biofilm Porphyromonas gingivalis dan biofilm Candida albicans.  Dibagi menjadi 4 kelompok, di mana tiap kelompok terdiri dari 4 sampel. Kelompok K+ (kelompok kontrol positif), P1(kitosan 0,25%), P2 (kitosan 0,5%), P3 (kitosan 1%). Penghambatan biofilm ditentukan dengan menggunakan metode microtiter plate yang menghasilkan nilai optical density kemudian dihitung dengan menggunakan rumus persen penghambatan. Analisis data menggunakan one-way ANOVA diikuti dengan uji LSD. Hasil: Terdapat perbedaan yang signifikan penghambatan biofilm dari kitosan Portunus pelagicus terhadap Porphyromonas gingivalis (p<0,05) antara kelompok, kecuali K + dengan P3. Sedangkan untuk penghambatan Candida albicans menunjukkan bahwa ada perbedaan yang signifikan dalam persentase penghambatan biofilm (p<0,05), antara kelompok K+ dengan P2 dan P3; kelompok P1 dengan P2 dan P3; kelompok P2 dengan P3. Simpulan: Kitosan Portunus pelagicus memiliki potensi dalam menghambat pembentukan biofilm Porphyromonas gingivalis dan pertumbuhan Candida albicans. Kitosan Portunus pelagicus 1% memiliki efek antimikrobial terbesar pada biofilm.Kata kunci: Biofilm, Porphyromonas gingivalis, Candida albicans, kitosan portunus pelagicus, periodontitis. ABSTRACTIntroduction: Biofilm formation is important in periodontitis pathogenesis. Porphyromonas gingivalis and Candida albicans, which are found in dental plaque and can form a biofilm, have virulence factor that facilitates the bacterial colonisation and proliferation in periodontal pockets. Chitosan extract of flower crab (Portunus pelagicus) has antimicrobial potential which can be used as an alternative therapy. The objective of this research was to analyse the potential of flower crab (Portunus pelagicus) chitosan in the inhibition of Porphyromonas gingivalis and Candida albicans biofilms. Methods: This research was a pure experimental laboratory. This study used flower crab (Portunus pelagicus) chitosan to inhibit the biofilm formation of Porphyromonas gingivalis and Candida albicans. The subjects were divided into four groups, where each group consisted of 4 samples. The K+ (positive control group), P1 (0.25% chitosan), P2 (0.5% chitosan), and P3 (1% chitosan). The biofilm inhibition was determined using the microtiter plate methods, which results in the value of optical density, then calculated using the inhibition formula percentage. Data analysis was conducted using the one-way ANOVA followed by the LSD test. Results: There were significant differences in the Porphyromonas gingivalis biofilm inhibition between groups (p < 0.05), except in group K+ with P3. Whereas for Candida albicans biofilm inhibition showed no significant difference (p < 0.05) between group K+ with P2 and P3; group P1 with P2 and P3; and group P2 with P3. Conclusion: The chitosan of flower crab (Portunus pelagicus) has the potential in inhibiting the biofilm formation of  Porphyromonas gingivalis and Candida albicans. The highest antibacterial effect on the biofilm formation is shown in the concentration of 1%.Keywords: Biofilm, Porphyromonas gingivalis, Candida albicans, chitosan, Portunus pelagicus, periodontitis.

scholarly journals Study of quorum-sensing LasR and RhlR genes and their dependent virulence factors in Pseudomonas aeruginosa isolates from infected burn wounds

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Aya Ahmad Elnegery ◽  
Wafaa Kamel Mowafy ◽  
Tarek Ahmed Zahra ◽  
Noha Tharwat Abou El-Khier
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Quorum Sensing ◽  
Proteolytic Activity ◽  
Virulence Factors ◽  
Biofilm Formation ◽  
Type Species ◽  
Assay Method ◽  
Content Type ◽  
Burn Wounds ◽  
Link Type

Background. Pseudomonas aeruginosa (P. aeruginosa) is an opportunistic pathogen responsible for burn-wound infection. High incidence, infection severity and increasing resistance characterize P. aeruginosa -induced burn infection. Purpose. To estimate quorum-sensing (QS)-dependent virulence factors of P. aeruginosa isolates from burn wounds and correlate it to the presence of QS genes. Methods. A cross-sectional descriptive study included 50 P . aeruginosa isolates from burn patients in Mansoura University Plastic and Burn Hospital, Egypt. Antibiotic sensitivity tests were done. All isolates were tested for their ability to produce biofilm using a micro-titration assay method. Protease, pyocyanin and rhamnolipid virulence factors were determined using skimmed milk agar, King’s A medium and CTAB agar test, respectively. The identity of QS lasR and rhlR genes was confirmed using PCR. Results. In total, 86 % of isolates had proteolytic activity. Production of pyocyanin pigment was manifested in 66 % of isolates. Altogether, 76 % of isolates were rhamnolipid producers. Biofilm formation was detected in 96 % of isolates. QS lasR and rhlR genes were harboured by nearly all isolates except three isolates were negative for both lasR and rhlR genes and two isolates were positive for lasR gene and negative for rhlR gene. Forty-nine isolates were considered as extremely QS-proficient strains as they produced QS-dependent virulence factors. In contrast, one isolate was a QS deficient strain. Conclusions. QS affects P. aeruginosa virulence-factor production and biofilm in burn wounds. Isolates containing lasR and rhlR seem to be a crucial regulator of virulence factors and biofilm formation in P. aeruginosa whereas the lasR gene positively regulates biofilm formation, proteolytic activity, pyocyanin production and rhamnolipid biosurfactant synthesis. The QS regulatory RhlR gene affects protease and rhamnolipid production positively.

scholarly journals In vitro Antibiofilm Activity of Pomegranate (Punica granatum) Juice on Oral Pathogens

2019 ◽  
Vol 1 (2) ◽  
pp. 49
Author(s):  
Jemima Pramadita ◽  
Armelia Sari Widyarman
Keyword(s):  
Biofilm Formation ◽  
Brain Heart Infusion ◽  
Punica Granatum ◽  
Pomegranate Juice ◽  
Bacterial Suspension ◽  
Antibiofilm Activity ◽  
Microplate Reader ◽  
Level Of Significance ◽  
Negative Controls

Introduction: Pomegranate (Punica granatum) fruit contains valuable ingredients, such as ellagitannins and flavonoids, that have many potential effects, including antibacterial, antifungal, and anti-inflammatory functions. Objectives: The aim of this study was to investigate the effects of pomegranate fruit juice on F. nucleatum and S. sanguinis monospecies and multispecies biofilm formation in vitro. Methods: Pomegranate juice was obtained using a juicer and diluted using a brain heart infusion (BHI) broth into five different concentrations. The biofilm assay was performed as follows: F. nucleatum and S. sanguinis were cultured separately in the BHI broth for 48 hours at 37°C in an anaerobic atmosphere. A 200 mL bacterial suspension (107 CFU/mL) was distributed into a 96-well plate and incubated for 24 hours to form  a biofilm. Subsequently, pomegranate juice was added to the biofilm well and observed after 1 hours, 3 hours, 6 hours, and 24 hours. The biofilm mass was measured using a microplate reader (490 nm) after crystal violet staining. Chlorhexidine (0.2%) and the biofilms without treatment were used as the positive and negative controls, respectively. The data were statistically analyzed using one-way analysis of variance, with p<0.05 as the level of significance. Result: There was a significant biofilm reduction after treatment with pomegranate juice for all the concentrations and incubation times (p<0.05). The effective concentrations to inhibit the biofilm monospecies F. nucleatum and S. sanguinis and the multispecies were 6.25% (OD 0.148±0.019), 50% (OD 0.211±0.026), and 6.25% (OD 0.024±0.209), respectively. Conclusion: Pomegranate juice inhibits F. nucleatum and S. sanguinis biofilm formation as a monospecies and a multispecies. Future studies are needed to observe the mechanism of this active substance.

Microwave Irradiation of Candidal Adhesion and Biofilm on Polymethylmethacrylate Resin

2014 ◽  
Vol 905 ◽  
pp. 73-77
Author(s):  
Reiyal Goveas ◽  
Theerathavaj Srithavaj ◽  
Amornrat Wonglamsam ◽  
Boonyanit Thaweboon ◽  
Sroisiri Thaweboon
Keyword(s):  
Flexural Strength ◽  
Microwave Irradiation ◽  
Biofilm Formation ◽  
Strength Reduction ◽  
Maximum Effect ◽  
Phase Study ◽  
Significant Difference ◽  
Candidal Species ◽  
Pmma Resin ◽  
One Way Anova

This 3 phase study examined (1) the effect of microwave irradiation on the adhesion and (2) biofilm formation of 4 candidal species on heat polymerized polymethyl methacrylate (PMMA) specimens. Lastly, (3) the flexural strength of heat polymerized PMMA was tested.C.albicans(ATCC 10231),C. glabrata(ATCC 22019),C. krusei(ATCC 6258) andC.parapsilosis(ATCC 90030) were used. The flexural strength of the PMMA resin after microwave irradiation was tested in accordance with ISO 20795-1 specifications. A one-way ANOVA statistical analysis was used for all the results.The maximum effect of 94% to 98% reduction in adhesion and biofilm counts was seen with microwave irradiation at 850 W and 1000 W for 120 sec. There was no significant difference between the control and irradiated specimens in terms of flexural strength. Reduction of candida adhesion and biofilm on PMMA resin can be achieved with microwave irradiation.

scholarly journals Effectiveness of Oxalis corniculata L. Ethanol Extract against Mono-Species of Biofilm Staphylococcus aureus

2021 ◽  
Vol 4 (3) ◽  
pp. 184-191
Author(s):  
Hasyrul Hamzah ◽  
Khalish Arsy Al Khairy Siregar ◽  
Ari Nurwijayanto ◽  
Retno Wahyuningrum ◽  
Seftika Sari
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Biofilm Formation ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Antibiofilm Activity ◽  
Minimum Concentration ◽  
The Social ◽  
The Impact ◽  
Biofilm Inhibitor

Inappropriate administration of antibiotics can cause resistance to bacteria. Staphylococcus aureus is one of the strong biofilm-forming bacteria that cause antibiotic resistance. Calincing (Oxalis corniculata L.) leaves have excellent antibacterial activity, but their antibiofilm activity against S. aureus has not been reported until now. Currently, the discovery of new antibiofilm against S. aureus biofilms is significant to prevent the impact of infections caused by biofilms. This study was intended to determine the effectiveness of the ethanol extract of O. corniculata leaves in inhibiting and eradicating S. aureus biofilm formation. Planktonic testing, inhibition, and biofilm eradication activity were carried out using the microtiter broth method. Antibiofilm activity of O. corniculata leaves against S. aureus biofilm was analyzed by calculating the minimum concentration of biofilm inhibitor (MBIC50) and minimum biofilm eradication concentration (MBEC50). Data were analyzed using the Statistical Package for the Social Sciences (SPSS) with a 95% confidence level. Oxalis corniculata leaves showed inhibitory activity on the formation of the tested S. aureus biofilm. The ethanol extract of 1% O. corniculata leaves gave 76.23±0.01% antibacterial activity of S. aureus and 71.32±0.01% of mid-phase antibiofilm activity, and 69.33±0.01% maturation phase. The results also prove that the ethanolic extract of O. corniculata leaves can eradicate S. aureus biofilm formation. Therefore, the ethanol extract of O. corniculata leaves can be developed as a new antibiofilm against S. aureus.

scholarly journals Potential of Lactobacillus casei shirota’s strain against the biofilm-forming of Salmonella Spp

2019 ◽  
Vol 8 (2) ◽  
pp. 54-63
Author(s):  
Annisa Rizka Fauziah ◽  
Meiska Bahar ◽  
Aprilla Ayu Wulandari
Keyword(s):  
Biofilm Formation ◽  
Lactobacillus Casei ◽  
Microtiter Plate ◽  
Assay Method ◽  
Antibiofilm Activity ◽  
Salmonella Spp ◽  
Microplate Reader ◽  
Competitive Adhesion ◽  
Concentration Series

Biofilm of Salmonella spp. is formed through the expression of biofilm genes associated with proteins (bapA) regulated by curli synthesis genes (csg) which carry out adhesion, colonization, maturation, and dispersion on the surface of the intestinal epithelium. This study aimed to determine the antibiofilm activity of Lactobacillus casei Shirota’S strain (LcS) as an inhibitor of Salmonella spp. biofilm formation in vitro. This research was a true experimental study using Microtiter Plate 96 wells Biofilm Assay method. The sample used was the suspension of Salmonella spp. The treatment was in the form of adding a LcS suspension with a concentration series of 10-1;10-2; 10-3;10-4; and 10-5. Biofilm measurements were carried out using a microplate reader and obtained quantitative data in the form of Optical Density at a wavelength of 595nm. The results of this study showed that LcS suspension has antibiofilm activity ranging from 10-5 concentrations with a percentage of 36.58% (p<0.05). The results of exometabolism LcS can reduce Salmonella growth. Exopolysaccharide (EPS) and sortase-dependent proteins (SrtA) of LcS form barriers as competitive adhesion in inhibiting pathogenic biofilm formation.

scholarly journals The Activity of Ethanolic Extract of Cyclea barbata Miers as Inhibitor of Bacterial Biofilm Formation of Salmonella typhi

2016 ◽  
Vol 2 (2) ◽  
pp. 24 ◽  
Author(s):  
Dimes Atika Permanasari ◽  
Elly Nurus Sakinah ◽  
Ali Santosa
Keyword(s):  
Biofilm Formation ◽  
Ethanolic Extract ◽  
Salmonella Typhi ◽  
Complex Compounds ◽  
Bacterial Biofilm ◽  
Bacterial Suspension ◽  
Food Substance ◽  
Randomized Design ◽  
Group A ◽  
One Way Anova

Biofilm is a matrix consist of extracelullar polysaccharides from the replication of microbial cells that are irreversibly attached on the cell surface. Biofilm in bacteria S.typhi strain DT104 contains food substance for protection. Biofilm can be attached to the clutery, causing food contaminaton. Cyclea barbata Miers is a plant has flavonoid that can inhibited bacteria biofilm formation. Flavonoid is phenolic compounds that has function as antibacterial by forming complex compounds disturbing the integrity of cell membranes and inhibiting biofilm. This study aims to determine the activity of the Cyclea barbata Miers as inhibitor of S.typhi DT 104 biofilm formation. This study used Quasy Experimental design with completely randomized design This study used 28 samples consist of 5 doses groups (0.29 mg/ ml, 0.33 mg / ml, 0.40 mg / ml, 0.50 mg / ml, 0.67 mg / ml), positive group (a bacterial suspension with H2O2) and negative group (a bacterial suspension with H2O) The result showed that the increasing doseof extract will decrease the biofilm formation revealed by decreasing of Optical Density and showed One Way Anova test resulted p = 0.004. In conclusion, the ethanolic extract of Cyclea barbata Miers was able to inhibit S.typhi DT 104 biofilm formation and there was a correlation between the concentration of ethanoic extract of Cyclea barbata Miers and inhibition of S.typhi biofilm formation. Key words: biofilm, Cyclea barbata Miers, S.typhi

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