Green synthesis of chitosan capped silver nanoparticles and their antimicrobial activity

MRS Advances ◽  
2018 ◽  
Vol 3 (42-43) ◽  
pp. 2505-2517 ◽  
Author(s):  
Zondi Nate ◽  
Makwena Justice Moloto ◽  
Pierre Kalenga Mubiayi ◽  
Precious Nokwethemba Sibiya
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Spherical Particles ◽  
Cubic Phase ◽  
Face Centered Cubic ◽  
Surface Binding ◽  
Polymeric Compound ◽  
Antibacterial And Antifungal Activities ◽  
Bacteria And Fungi ◽  
Antibacterial And Antifungal

AbstractChitosan is a polymeric compound with functional groups which enable surface binding to nanoparticles and antibacterial activity. The antimicrobial activity was studied using silver nanoparticles with varied concentrations of chitosan. The nanoparticles were synthesized through a simple and environmentally friendly method at room temperature. Spherical particles with average sizes between 2 and 6 nm were obtained and their crystallinity showed a face-centered cubic phase. The evidence of chitosan presence on the nanoparticle surface was confirmed by the characteristic diffraction peak of chitosan and by FTIR spectra where the bonding of amine group could be depicted. The chitosan-capped silver nanoparticles showed good antibacterial and antifungal activities with MIC values between 0.20 and 1.5 mg.mL-1 compared to those obtained from most of references (up to 6.25 mg.mL-1) on the selected gram-positive (Staphylococcus aureus, Enterococcus faecalis), gram-negative (Klebsiella pneumoniae, Pseudomonas aeruginosa ) bacteria and fungi (Candida albicans, Cryptococcus neoformans).

Synthesis, antibacterial, and antifungal activities of new pyrimidinone derivatives

2015 ◽  
Vol 21 (4) ◽  
pp. 191-194 ◽  
Author(s):  
Oussama Cherif ◽  
Fatma Masmoudi ◽  
Fatma Allouche ◽  
Fakher Chabchoub ◽  
Mohamed Trigui
Keyword(s):  
Antimicrobial Activity ◽  
Broad Spectrum ◽  
Pathogenic Fungi ◽  
Gram Negative Bacteria ◽  
Efficient Synthesis ◽  
Gram Negative ◽  
Antifungal Activities ◽  
Antibacterial And Antifungal Activities ◽  
Bacteria And Fungi ◽  
Antibacterial And Antifungal

AbstractAn efficient synthesis of new pyrrolopyrimidinones 3a-d and isoxazolopyrimidinones 4a-c from the respective aminocyanopyrroles 1a-d and aminocyanoisoxazoles 2a-c is presented. The synthesized compounds were screened for antimicrobial activity against a panel of bacteria and fungi. Compound 4c exhibits remarkable activity against a broad spectrum of Gram-positive and Gram-negative bacteria and pathogenic fungi.

scholarly journals Antimicrobial Activity of Apple Cider Vinegar

2017 ◽  
Vol 16 (2) ◽  
pp. 11-15 ◽  
Author(s):  
Asma Saqib
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Agents ◽  
Medicinal Purpose ◽  
Diverse Range ◽  
Antifungal Activities ◽  
Apple Cider ◽  
Antibacterial And Antifungal Activities ◽  
Medicinal Properties ◽  
Bacteria And Fungi ◽  
Antibacterial And Antifungal

In recent years, there has been a growing interest in researching and developing new antimicrobial agents from various sources to combat microbial resistance. Apple cider vinegar, otherwise known as cider vinegar or ACV, is a type of vinegar made from cider or apple must and has a pale to medium amber color. Unpasteurized or organic ACV contains mother of vinegar. It has been used for medicinal purpose for thousands of years for its various medicinal properties. The antimicrobial activity of cider vinegar has been recognized but not investigated. It can be used as alternative to commercial antimicrobial agents. The present study aims at finding the antibacterial and antifungal activities of various dilutions of ACV against diverse range of bacteria and fungi to generate data for which little investigation exist.

scholarly journals Antimicrobial Activity of Silver Nanoparticles Synthesized Using Goat Milk against Pathogens of Selected Vegetables

2019 ◽  
pp. 1-10 ◽  
Author(s):  
T. A. Ihum ◽  
C. C. Iheukwumere ◽  
I. O. Ogbonna ◽  
G. M. Gberikon
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Goat Milk ◽  
Cubic Phase ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

This study was carried out to determine the antimicrobial activity of silver nanoparticles synthesized using goat milk against pathogens of selected vegetables. Synthesis of Silver nanoparticles was done using Goat milk, and characterized using Ultra Violet-Visible absorption spectroscopy, Fourier-transform infrared spectroscopy (FTIR), X- ray diffraction (XRD) and Transmission Electron Microscopy (TEM). Maximum absorbance of Goat milk synthesized AgNPs was observed at 417 nm, with FTIR peaks at 3455 cm−1, 1628 cm−1, 1402 cm−1, 1081 cm−1 and 517 cm−1, indicating that proteins in Goat milk (GM) were the capping and stabilization molecules involved the synthesis of AgNPs. Transmission electron microscopy analysis showed that the biosynthesized particles were spherical in shape having a size of 10-100 nm, X- ray diffraction (XRD) pattern agreed with the crystalline nature and face-centered cubic phase of AgNPs. Evaluation of the antimicrobial activity of AgNPs synthesized using GM against the indicator strains (Staphylococcus aureus CIP 9973, Pectobacterium carotovorum Pec1, Enterobacter cloacae AS10, Klebsiella aerogenes OFM28, Proteus mirabilis UPMSD3 and Escherichia coli 2013C-3342) isolated from selected vegetables, was carried out using the Agar diffusion assay at different concentrations of 25, 75 and 100 µl/ml. The present study demonstrated that the AgNPs synthesized using Goat milk have potent biological activities, which can find applications in diverse areas.

scholarly journals Microwave assisted synthesis of substituted 4-chloro-8-methyl-2-(1,3-diphenyl-1H-pyrazol-4-yl)-1,5-dioxa-2H-phenanthren-6-ones and their antimicrobial activity

2017 ◽  
Vol 82 (2) ◽  
pp. 117-125 ◽  
Author(s):  
Dongamanti Ashok ◽  
Reddy Vanaja ◽  
Mdderla Sarasija ◽  
Vijaya Lakshmi
Keyword(s):  
Antimicrobial Activity ◽  
Pathogenic Bacteria ◽  
Microwave Assisted Synthesis ◽  
Vilsmeier Reaction ◽  
Microwave Assisted ◽  
Antibacterial And Antifungal Activities ◽  
Bacteria And Fungi ◽  
Antibacterial And Antifungal ◽  
Microwave Assisted Method

Due to the potential antimicrobial activity of pyranochromenones and pyrazolines moieties, hybrid compounds containing both, substituted 4-Chloro-8-methyl-2-(1,3-diphenyl- -1H-pyrazol-4-yl)-1,5-dioxa-2H-phenanthren-6-ones (4a-g), have been synthesized from substituted (E)-1-(7-Hydroxy-4-methyl-8-coumarinyl)-3-(1,3-diphenyl -1H-pyrazol-4-yl)-2-propen-1-ones (3a-g) in good yield using the Vilsmeier reaction, by microwave-assisted method. The structures of all the compounds have been established on the basis of analytical and spectral data. All the synthesized compounds were tested in vitro for their antibacterial and antifungal activities. Some of the compounds have shown very good activity compared to standard drugs against all pathogenic bacteria and fungi.

scholarly journals Chemical Composition and Antimicrobial Activity of the Essential Oil from Flowers of Eryngium triquetrum (Apiaceae) Collected Wild in Sicily

2016 ◽  
Vol 11 (7) ◽  
pp. 1934578X1601100
Author(s):  
Simona Casiglia ◽  
Maurizio Bruno ◽  
Sergio Rosselli ◽  
Felice Senatore
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Antifungal Activities ◽  
Antibacterial And Antifungal Activities ◽  
Art Works ◽  
Main Components ◽  
Antibacterial And Antifungal ◽  
Historical Art

The chemical composition of the essential oil from flowers of Eringium triquetrum Vahl. collected in Sicily was evaluated by GC and GC-MS. The main components were pulegone (50.6%), piperitenone (30.5%) and menthone (7.0%). Comparison of this oil with other studied oils of Eringium species is discussed. The oil showed good antibacterial and antifungal activities against some microorganisms that infest historical art works.

scholarly journals Phytochemical investigation and in vitro antimicrobial activity of Richardia scabra

2016 ◽  
Vol 11 (2) ◽  
pp. 248 ◽  
Author(s):  
Kathirvel Poonkodi ◽  
Subban Ravi
Keyword(s):  
Antimicrobial Activity ◽  
Diffusion Method ◽  
Bacterial Strains ◽  
Weed Species ◽  
Antibacterial And Antifungal Activities ◽  
Agar Plug ◽  
Phytochemical Investigation ◽  
Antibacterial And Antifungal ◽  
Simple Sugar

<p class="Abstract">The present study was aimed to evaluate the phytochemical screening and antimicrobial activity of the petroleum ether and methanol extracts from the mature leaves of <em>Richardia scabra</em> from India. Disc diffusion method was used to determine the zone inhibition of the tested samples for antibacterial and agar plug method was used to determine the antifungal activity, while the microtube-dilution technique was used to determine the minimum inhibitory concentration. Both extracts showed significant antibacterial and antifungal activities when tested against 10 bacterial and four fungal strains. The minimum inhibitory concentrations of the methanol extract of<em> R. scabra</em> ranged between 12.5–100 μg/mL for bacterial strains. Alkaloids, steroids, flavonoids, fatty acids, terpenoids and simple sugar were detected as phytoconstituents of extracts. To the best of our knowledge, this is the first report against antimicrobial activity of common weed species <em>R. scabra</em> found in India.</p><p> </p>

scholarly journals Chemistry, Antioxidant, Antibacterial and Antifungal Activities of Volatile Oils and their Components

2009 ◽  
Vol 4 (12) ◽  
pp. 1934578X0900401 ◽  
Author(s):  
Laura De Martino ◽  
Vincenzo De Feo ◽  
Florinda Fratianni ◽  
Filomena Nazzaro
Keyword(s):  
Essential Oils ◽  
Antibacterial Activities ◽  
Penicillium Citrinum ◽  
Volatile Oils ◽  
Foeniculum Vulgare ◽  
Antibacterial And Antifungal Activities ◽  
Components Analysis ◽  
Bacteria And Fungi ◽  
Antibacterial And Antifungal ◽  
Natural Preservatives

The present paper reports the chemical composition, antioxidant and antibacterial activities of several essential oils and their components. Analysis showed that three oils (Carum carvi L., Verbena officinalis L. and Majorana hortensis L.) contained predominantly oxygenated monoterpenes, while others studied (Pimpinella anisum L., Foeniculum vulgare Mill.) mainly contained anethole. C. carvi, V. officinalis and M. hortensis oils exhibited the most potent antioxidant activity, due their contents of carvacrol, anethole and estragol. Antibacterial action was assessed against a range of pathogenic and useful bacteria and fungi of agro-food interest. V. officinalis and C. carvi oils proved the most effective, in particular against Bacillus cereus and Pseudomonas aeruginosa. Carvacrol proved most active against Escherichia coli, and completely inhibited the growth of Penicillium citrinum. The oils proved inactive towards some Lactobacilli strains, whereas single components showed an appreciable activity. These results may be important for use of the essential oils as natural preservatives for food products.

Sol-gel synthesis, characterisation, and photocatalytic activity of porous spinel Co3O4 nanosheets

2014 ◽  
Vol 68 (8) ◽  
Author(s):  
Manoj Pudukudy ◽  
Zahira Yaakob
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Surface Area ◽  
Uv Light ◽  
Average Pore Size ◽  
Sol Gel ◽  
Spherical Particles ◽  
Cubic Phase ◽  
Face Centered Cubic ◽  
Oriented Growth

AbstractMesoporous spinel Co3O4 nanosheets were synthesised via a simple sol-gel route using the Pluronic P123 triblock copolymer as the stabilising agent. Their structural, morphological, and textural properties were characterised. FTIR spectrum revealed the formation of cobalt oxide without any surface adsorbed impurities. Face centered cubic phase of spinel Co3O4 with the mean crystalline size of 26 nm was assigned by the X-ray diffraction analysis without the formation of other phases. Porous nanosheets and cave-like morphologies were identified from the scanning electron microscopy (SEM) images. Highly agglomerated more or less spherical particles with well separated lattice fringes, representing the oriented growth of nanocrystals, were noticed on the transmission electron microscopy photographs. Surface area analysis revealed that the spinel has high surface area of about 25 m2 g−1 with monomodal mesoporosity. The average pore size distribution was found to be about 15.8 nm. The as-prepared spinel photocatalyst showed a mild photocatalytic activity in the degradation of methylene blue (2.5 mg L−1) under UV light irradiation with air as the oxidising agent. Photocatalytic activity of the as-prepared reusable Co3O4 was found to be higher than that of the commercial spinel powder.

scholarly journals Synthesis and Antimicrobial Activity of Some Chalcone Derivatives

2008 ◽  
Vol 5 (3) ◽  
pp. 461-466 ◽  
Author(s):  
Y. Rajendra Prasad ◽  
A. Lakshmana Rao ◽  
R. Rambabu
Keyword(s):  
Aqueous Solution ◽  
Antimicrobial Activity ◽  
Potassium Hydroxide ◽  
Room Temperature ◽  
Antimicrobial Agents ◽  
Aromatic Aldehydes ◽  
Plate Method ◽  
H Nmr ◽  
Antibacterial And Antifungal Activities ◽  
Antibacterial And Antifungal

In an effort to develop antimicrobial agents, a series of chalcones were prepared by Claisen-Schmidt condensation of appropriate acetophenones with appropriate aromatic aldehydes in the presence of aqueous solution of potassium hydroxide and ethanol at room temperature. The synthesized compounds were characterized by means of their IR,1H-NMR spectral data and elemental analysis. All the compounds were tested for their antibacterial and antifungal activities by the cup plate method.

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