scholarly journals Bioguided Fractionation ShowsCassia alataExtract to InhibitStaphylococcus epidermidisandPseudomonas aeruginosaGrowth and Biofilm Formation

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Samuel Takashi Saito ◽  
Danielle da Silva Trentin ◽  
Alexandre José Macedo ◽  
Cristina Pungartnik ◽  
Grace Gosmann ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Biofilm Formation ◽  
Leaf Extract ◽  
High Resolution Mass Spectrometry ◽  
Solid Phase ◽  
Folk Medicine ◽  
Bacterial Biofilm ◽  
Aqueous Leaf Extract ◽  
Overlay Technique ◽  
Agar Overlay Technique

Plant extracts have a long history to be used in folk medicine.Cassia alataextracts are known to exert antibacterial activity but details on compounds and mechanism of action remain poorly explored. We purified and concentrated the aqueous leaf extract ofC. alataby reverse phase-solid phase extraction and screened the resulting CaRP extract for antimicrobial activity. CaRP extract exhibited antimicrobial activity forPseudomonas aeruginosa,Staphylococcus epidermidis,S. aureus, andBacillus subtilis. CaRP also inhibited biofilm formation ofS. epidermidisandP. aeruginosa. Several bacterial growth-inhibiting compounds were detected when CaRP extract was fractionated by TLC chromatography coupled to bioautography agar overlay technique. HPLC chromatography of CaRP extract yielded 20 subfractions that were tested by bioautography for antimicrobial activity againstS. aureusandS. epidermidis. Five bioactive fractions were detected and chemically characterized, using high-resolution mass spectrometry (qTOF-MS/MS). Six compounds from four fractions could be characterized as kaempferol, kaempferol-O-diglucoside, kaempferol-O-glucoside, quercetin-O-glucoside, rhein, and danthron. In theSalmonella/microsome assay CaRP showed weak mutagenicity (MI<3) only in strain TA98, pointing to a frameshift mutation activity. These results indicate thatC. alataleaf extract contains a minimum of 7 compounds with antimicrobial activity and that these together or as single substance are active in preventing formation of bacterial biofilm, indicating potential for therapeutic applications.

Green Synthesis of Silver Nanoparticles by Allamanda cathartica L. Leaf Extract and Evaluation for Antimicrobial Activity

2013 ◽  
Vol 6 (4) ◽  
pp. 2260-2268
Author(s):  
M. Linga Rao ◽  
Bhumi G ◽  
Savithramma N
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Fusarium Species ◽  
Inhibition Zone ◽  
Fungal Species ◽  
Green Technology ◽  
Metallic Silver ◽  
Synthesis Of Nanoparticles ◽  
Aqueous Leaf Extract

Silver nanoparticles (SNPs) exhibit tremendous applications in medicine as antimicrobial agent.  The use of different parts of plants for the synthesis of nanoparticles is considered as a green technology as it does not involve any harmful chemicals.  In the present study, we report a rapid biosynthesis of silver nanoparticles from aqueous leaf extract of medicinal plant Allamanda cathartica.  The active phytochemicals present in the plant were responsible for the quick reduction of silver ion to metallic silver nanoparticles. The reduced silver nanoparticles were characterized by using UV-Vis spectrophotometry, Scanning Electron Microscope (SEM), Energy Dispersive Analysis of X-ray (EDAX) and Atomic Force Microscopy (AFM).  The spherical shaped silver nanoparticles were observed and it was found to 19-40 nm range of size.  These phytosynthesized SNPs were tested for their antimicrobial activity and it analyzed by measuring the inhibitory zone. A. cathartica aqueous leaf extract of SNPs showed highest toxicity to Pseudomonas followed by Klebsiella, Bacillus and E. coli and lowest toxicity towards Proteus. In fungal species, highest inhibition zone was noted against Rhizopus followed by Curvularia, Aspergillus flavus and Aspergillus niger and minimum inhibition zone was observed against Fusarium species.  These results suggest a promising potential of Indian plant-based green chemistry for production of SNPs for biomedical and nanotechnology applications.

scholarly journals Antimicrobial Activity and Prevention of Bacterial Biofilm Formation of Silver and Zinc Oxide Nanoparticle-Containing Polyester Surfaces at Various Concentrations for Use

Foods ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 442 ◽  
Author(s):  
Fabio Fontecha-Umaña ◽  
Abel Guillermo Ríos-Castillo ◽  
Carolina Ripolles-Avila ◽  
José Juan Rodríguez-Jerez
Keyword(s):  
Antimicrobial Activity ◽  
Zinc Oxide ◽  
Biofilm Formation ◽  
Antimicrobial Properties ◽  
Bacterial Biofilm ◽  
Antimicrobial Efficacy ◽  
Ag Nps ◽  
Zno Nps ◽  
E Coli ◽  
Food Contact Surfaces

Food contact surfaces are primary sources of bacterial contamination in food industry processes. With the objective of preventing bacterial adhesion and biofilm formation on surfaces, this study evaluated the antimicrobial activity of silver (Ag-NPs) and zinc oxide (ZnO-NPs) nanoparticle-containing polyester surfaces (concentration range from 400 ppm to 850 ppm) using two kinds of bacteria, Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli), and the prevention of bacterial biofilm formation using the pathogen Listeria monocytogenes. The results of antimicrobial efficacy (reductions ≥ 2 log CFU/cm2) showed that at a concentration of 850 ppm, ZnO-NPs were effective against only E. coli (2.07 log CFU/cm2). However, a concentration of 400 ppm of Ag-NPs was effective against E. coli (4.90 log CFU/cm2) and S. aureus (3.84 log CFU/cm2). Furthermore, a combined concentration of 850 ppm Ag-NPs and 400 ppm ZnO-NPs showed high antimicrobial efficacy against E. coli (5.80 log CFU/cm2) and S. aureus (4.11 log CFU/cm2). The results also showed a high correlation between concentration levels and the bacterial activity of Ag–ZnO-NPs (R2 = 0.97 for S. aureus, and R2 = 0.99 for E. coli). They also showed that unlike individual action, the joint action of Ag-NPs and ZnO-NPs has high antimicrobial efficacy for both types of microorganisms. Moreover, Ag-NPs prevent the biofilm formation of L. monocytogenes in humid conditions of growth at concentrations of 500 ppm. Additional studies under different conditions are needed to test the durability of nanoparticle containing polyester surfaces with antimicrobial properties to optimize their use.

scholarly journals The Immuno-modulatory and Thrombocytopaenic Effects of the Varying Concentrations of the Aqueous Leaf Extract of Moringa Oleifera in Male Albino Wistar Rats

2019 ◽  
pp. 1-8
Author(s):  
Ojeka Sunday Ogbu ◽  
Zabbey Victor Zigabelbari
Keyword(s):  
Wistar Rats ◽  
Leaf Extract ◽  
Moringa Oleifera ◽  
Folk Medicine ◽  
Control Group ◽  
Distribution Width ◽  
Treatment Groups ◽  
Immature Platelet Fraction ◽  
Group A ◽  
Aqueous Leaf Extract

Introduction: Moringa oleifera and related species are commonly used in folk medicine for various human diseases. Aim: The study was undertaken to establish the thrombocytopenic effect of the aqueous leaf extract of moringa oleifera and to find the utilization of platelet parameters in determining the cause of the thrombocytopenia. Methodology: Fresh leaves of moringa were dried and extracted with water. Thirty (30) male albino Wistar rats, weighing between 150-250 g, which were kept under uniform laboratory conditions, were randomly divided into five (5) groups (A-E), based on their weights. The control group (group A) was orally given 0.5 ml of distilled water while the treatment groups (groups B to E) were orally given 250 mg/kg, 450 mg/kg,650 mg/kg and 850 mg/kg body weight respectively of the extract, once a day, for 56days and then sacrificed. At the end of the administration, blood samples were collected from each rat and examined for platelet indices. The effects of treatment with aqueous leaf extract of moringa oleifera on the platelet parameters were compared with the control group. Result: The rats treated with the extract, showed a decrease in platelet count and platelet crit while there was a significant increase in the platelet distribution width, mean platelet volume and immature platelet fraction, concerning the control. Conclusion: The aqueous leaf extract of moringa oleifera is therefore shown to modulate the immune system and cause thrombocytopaenia, through platelet destruction.

scholarly journals Synergy between Indoloquinolines and Ciprofloxacin: An Antibiofilm Strategy against Pseudomonas aeruginosa

Antibiotics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1205
Author(s):  
Emilie Charpentier ◽  
Ludovic Doudet ◽  
Ingrid Allart-Simon ◽  
Marius Colin ◽  
Sophie C. Gangloff ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Antibiotic Resistance ◽  
Drug Discovery ◽  
Crystal Violet ◽  
Biofilm Formation ◽  
Bacterial Biofilm ◽  
Quinoline Derivatives ◽  
Crystal Violet Staining ◽  
Radical Process

Antibiotic treatments can participate in the formation of bacterial biofilm in case of under dosage. The interest of indoloquinoline scaffold for drug discovery incited us to study the preparation of new indolo [2,3-b]quinoline derivatives by a domino radical process. We tested the effect of two different “indoloquinoline” molecules (Indol-1 and Indol-2) without antimicrobial activity, in addition to ciprofloxacin, on biofilm formation thanks to crystal violet staining and enumeration of adhered bacteria. This association of ciprofloxacin and Indol-1 or Indol-2 attenuated the formation of biofilm up to almost 80% compared to ciprofloxacin alone, or even prevented the presence of adhered bacteria. In conclusion, these data prove that the association of non-antimicrobial molecules with an antibiotic can be a solution to fight against biofilm and antibiotic resistance emergence.

scholarly journals Natural products to control biofilm on painted surfaces

2018 ◽  
Vol 47 (2) ◽  
pp. 180-187 ◽  
Author(s):  
Sofia Bogdan ◽  
Cecilia Deya ◽  
Oscar Micheloni ◽  
Natalia Bellotti ◽  
Roberto Romagnoli
Keyword(s):  
Antimicrobial Activity ◽  
Biofilm Formation ◽  
Environmental Scanning Electron Microscopy ◽  
General Rule ◽  
Bacterial Biofilm ◽  
Microbial Colonization ◽  
Environmental Scanning ◽  
Content Type ◽  
Nicotiana Longiflora ◽  
High Standards

Purpose This paper aims to study five vegetables extracts as possible additives to control bacterial growth on indoor waterborne paints. The extracts were obtained from the weeds Raphanus sativus, Rapistrum rugosum, Sinapis arvensis, Nicotiana longiflora and Dipsacus fullonum, used in traditional medicine as antimicrobial compounds. Design/methodology/approach Weeds extracts were characterized by Fourier transform infrared spectroscopy and UV–Vis spectrophotometry. Their antibacterial activity against Escherichia coli and Staphylococcus aureus was also determined. Afterward, selected extracts were incorporated in waterborne paint formulations. The paints’ antimicrobial activity was assessed against S. aureus, monitoring biofilm formation by environmental scanning electron microscopy. Findings As a general rule, results showed that tested paints were efficient in inhibiting biofilm formation, especially that formulated with Nicotiana longiflora. Practical implications The tested paints can be used to protect walls from microbial colonization, which shortened coatings’ useful life by discoloration and/or degradation. Concomitantly, indoor microbial colonization by aerosols could be also diminished. This is especially important in places that should have high standards of environmental hygiene, as in the food industry, health-care and sanitary centers. Originality/value The main value of this research was to study the antimicrobial activity of weeds extracts and to incorporate them in waterborne paints to diminish bacterial biofilm formation. This biofilm discolors and degrades the paint, and causes health problems. The use of natural compounds in coatings is increasing because of the convenience of using renewable sources, such as natural antimicrobials, in paint formulations.

scholarly journals Evaluation of Antimicrobial activity and Genotoxic Potential of Capparis spinosa (L.) Plant Extracts

2021 ◽  
pp. 48-57
Author(s):  
Ghaleb M. Adwan ◽  
Ghadeer Ibrahim Omar
Keyword(s):  
Antimicrobial Activity ◽  
Leaf Extract ◽  
Fungal Infections ◽  
Bacterial Species ◽  
Genotoxic Effect ◽  
Enterobacterial Repetitive Intergenic Consensus ◽  
E Coli ◽  
Rapd Pcr ◽  
Capparis Spinosa ◽  
Aqueous Leaf Extract

Objective: The aims of this study were to evaluate the antimicrobial activity and the genotoxic effect of both ethanolic and aqueous extracts of stem and leaf of Capparis spinosa (C. spinosa) plant on Escherichia coli (E. coli) ATCC 25922, Staphylococcus aureus (S. aureus) ATCC 6538P, clinical isolate of Methicillin-resistant S. aureus (MRSA) and Klebsiella pneumoniae (K. pneumoniae) and Candida albicans (C. albicans) ATCC 90028. Materials and Methods: The antimicrobial activity was determined using microbroth dilution method, while the genotoxic effect was investigated using randomly amplified polymorphic DNA (RAPD)-PCR and enterobacterial repetitive intergenic consensus (ERIC)-PCR. Results: The MIC values of both ethanolic and aqueous leaf and stem extracts of C. spinosa plant had a range 6.25 mg/ml to 100 mg/ml. In addition, it was found that ethanolic extract more effective than aqueous extract. The genotoxic activity of aqueous leaf extract, showed changes in both Random Amplified Polymorphic DNA (RAPD)-PCR and Enterobacterial Repetitive Intergenic Consensus (ERIC)-PCR profiles of E. coli strain treated with extract compared to untreated (negative) control. These changes included an alteration in the intensity, absence or appearance of new amplified fragments. Conclusions: Results of this study strongly show the genotoxic effect of aqueous leaf extract from C. spinosa plant on E. coli. The findings draw awareness to the possible toxic effect use of C. spinosa plant in traditional medicine and point out the capability of using C. spinosa to treat bacterial or fungal infections. More studies are needed to detect the exact ingredients of this plant as well as the mechanisms responsible for genotoxicity. Further in vivo genotoxicity studies are recommended to ensure and to evaluate the safety of using plants for therapeutic purposes. In addition, results of this study showed that molecular fingerprinting based on ERIC-PCR can be used to evaluate the genotoxic effect in the model bacterial species E. coli.

Green Synthesis of Silver Nanoparticles from Aqueous Leaf Extract of 'Selaginella bryopteris' and Elucidation of its Antimicrobial Activity

2020 ◽  
Vol 16 (4) ◽  
pp. 449-459
Author(s):  
Varsha Yadav ◽  
Neha Kapoor ◽  
Soma M. Ghorai ◽  
Pradeep
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Diffusion Method ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
Aqueous Leaf Extract ◽  
Selaginella Bryopteris

Background: Biosynthesis of nanoparticles from aqueous leaf extract of ‘Selaginella bryopteris’ is a green chemistry approach and is considered to be one of the most efficient methods as it is devoid of toxic chemicals as well as provides natural capping agents for the stabilization of synthesized nanoparticles. ‘S.bryopteris’ also known as ‘Sanjeevani’ (in India), is thought to be prospective natural resource that possesses extraordinary pharmaceutical potential. Objective: S. bryopteris is exclusively native to India and has already been known for its expression of stress-associated genes and high levels of protective metabolites of sugars, phenolic compounds, and polyols. Its potential as an antibacterial agent is being elucidated. Methods: Different leaf extract volumes, silver nitrate (AgNO3) concentrations, and reaction time were investigated separately and the optimal conditions for the synthesis of AgNPs were suggested. The resulting AgNPs were characterized by various techniques like Ultraviolet-Visible (UV-Vis) Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and XRay Diffraction (XRD). Antibacterial assays were carried out by using both agar disk and well diffusion method. Results: The AgNPs synthesized in this process were found to have efficient antimicrobial activity against both Gram-positive as well as Gram-negative bacteria. The antibacterial efficacy of S. bryopteris was consciously tried on uropathogenic Escherichia coli (Gram-negative bacteria) and Bacillus megaterium (Gram-positive bacteria) which have the self-limiting food poisoning potential along with opportunistic uropathogenic bacterial strains namely Proteus mirabilis (Gram-negative bacteria) and a non-pathogenic Micrococcus luteus (Gram-positive bacteria) for comparison. Conclusion: S. bryopteris mediated silver nanoparticles’ synthesis is attempted for being cost-effective, eco-friendly and safe for human therapeutics.

Antimicrobial activity of green silver nanoparticles produced using aqueous leaf extract of Hydrocotyle rotundifolia

2016 ◽  
Vol 16 (3) ◽  
pp. 195-201 ◽  
Author(s):  
Ragini Kumari ◽  
Girija Brahma ◽  
Sumit Rajak ◽  
Mukesh Singh ◽  
Santosh Kumar
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Aqueous Leaf Extract

Screening for antimicrobial activity of some essential oils by the agar overlay technique

1986 ◽  
Vol 8 (6) ◽  
pp. 289-292 ◽  
Author(s):  
A. M. Janssen ◽  
N. L. J. Chin ◽  
J. J. C. Scheffer ◽  
A. Baerheim Svendsen
Keyword(s):  
Antimicrobial Activity ◽  
Essential Oils ◽  
Overlay Technique ◽  
Agar Overlay Technique
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