Physico-chemical, antimicrobial and anticancer properties of silver nanoparticles synthesised from organ-specific extracts of Bidens pilosa L.

Phosphorus-containing heterocyclic cationic surfactants alkyldimethylphenylphospholium bromides with the alkyl chain length 14 to 18 carbon atoms were used for the stabilization of silver nanodispersions. Zeta potential of silver nanodispersions ranges from +35 to +70 mV, which indicates the formation of stable silver nanoparticles (AgNPs). Long-chain heptadecyl and octadecyl homologs of the surfactants series provided the most intensive stabilizing effect to AgNPs, resulting in high positive zeta potential values and smaller diameter of AgNPs in the range 50–60 nm. A comparison with non-heterocyclic alkyltrimethylphosphonium surfactants of the same alkyl chain length showed better stability and more positive zeta potential values for silver nanodispersions stabilized with heterocyclic phospholium surfactants. Investigations of biological activity of phospholium-capped AgNPs are represented by the studies of antimicrobial activity and cytotoxicity. While cytotoxicity results revealed an increased level of HepG2 cell growth inhibition as compared with the cytotoxicity level of silver-free surfactant solutions, no enhanced antimicrobial action of phospholium-capped AgNPs against microbial pathogens was observed. The comparison of cytotoxicity of AgNPs stabilized with various non-heterocyclic ammonium and phosphonium surfactants shows that AgNPs capped with heterocyclic alkyldimethylphenylphospholium and non-heterocyclic triphenyl-substituted phosphonium surfactants have the highest cytotoxicity among silver nanodispersions stabilized by the series of ammonium and phosphonium surfactants.

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Antimicrobial and Anticancer properties of Carica papaya leaves derived di-methyl flubendazole mediated silver nanoparticles

Journal of Infection and Public Health ◽

10.1016/j.jiph.2021.02.004 ◽

2021 ◽

Author(s):

Sandhanasamy Devanesan ◽

Murugesan Jayamala ◽

Mohamad S. AlSalhi ◽

Amirtham S. Umamaheshwari ◽

Jacob A. Ranjitsingh

Keyword(s):

Silver Nanoparticles ◽

Carica Papaya ◽

Anticancer Properties

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Interrelations of Synthesis Method, Polyethylene Glycol Coating, Physico-Chemical Characteristics, and Antimicrobial Activity of Silver Nanoparticles

Nanomaterials ◽

10.3390/nano10122475 ◽

2020 ◽

Vol 10 (12) ◽

pp. 2475

Author(s):

Amirah Shafilla Mohamad Kasim ◽

Arbakariya Bin Ariff ◽

Rosfarizan Mohamad ◽

Fadzlie Wong Faizal Wong

Keyword(s):

Antimicrobial Activity ◽

Silver Nanoparticles ◽

Polyethylene Glycol ◽

Pathogenic Bacteria ◽

Synthesis Method ◽

Chemical Characteristics ◽

Synthesis Methods ◽

Uniform Size ◽

Transmission Electron Microscopy Analysis ◽

Physico Chemical

Silver nanoparticles (AgNPs) have been found to have extensive biomedical and biological applications. They can be synthesised using chemical and biological methods, and coated by polymer to enhance their stability. Hence, the changes in the physico-chemical characteristics of AgNPs must be scrutinised due to their importance for biological activity. The UV-Visible absorption spectra of polyethylene glycol (PEG) -coated AgNPs displayed a distinctive narrow peak compared to uncoated AgNPs. In addition, High-Resolution Transmission Electron Microscopy analysis revealed that the shapes of all AgNPs, were predominantly spherical, triangular, and rod-shaped. Fourier-Transform Infrared Spectroscopy analysis further confirmed the role of PEG molecules in the reduction and stabilisation of the AgNPs. Moreover, dynamic light scattering analysis also revealed that the polydispersity index values of PEG-coated AgNPs were lower than the uncoated AgNPs, implying a more uniform size distribution. Furthermore, the uncoated and PEG-coated biologically synthesised AgNPs demonstrated antagonisms activities towards tested pathogenic bacteria, whereas no antagonism activity was detected for the chemically synthesised AgNPs. Overall, generalisation on the interrelations of synthesis methods, PEG coating, characteristics, and antimicrobial activity of AgNPs were established in this study.

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Influence of Physico-Chemical Parameters on the Fabrication of Silver Nanoparticles Using Petrea volubilis L. Stem Broth and Its Anti-Microbial Efficacy

International Journal of Pharmaceutical Sciences and Drug Research ◽

10.25004/ijpsdr.2017.090206 ◽

2017 ◽

Vol 9 (2) ◽

Author(s):

N. I. Hulkoti ◽

T. C. Taranath

Keyword(s):

Silver Nanoparticles ◽

Zeta Potential ◽

Silver Nitrate ◽

Microbial Activity ◽

Contact Time ◽

Nitrate Concentration ◽

Chemical Parameters ◽

Physico Chemical ◽

Vis Spectroscopy ◽

Silver Nitrate Concentration

In this study we describe the phytofabrication of AgNps through a green route as a cost-effective, instantaneous and an eco-friendly approach using Petrea volubilis L. stem broth. The influence of physico-chemical parameters - contact time, stem broth quantity, pH, temperature, and silver nitrate concentration were studied and optimised to engineer, nanoparticles of diverse sizes. Nanoparticles were characterized by UV-Vis spectroscopy, FTIR, XRD, Zeta potential, EDS, and HRTEM. The characterization using HRTEM showed that, the nanoparticles were spherical and with increase in contact time, stem broth quantity, pH, and temperature, the NPs size minimised whereas escalation in silver nitrate concentration, increased their size. Capping molecules were negatively charged and the NPs were passably stable according to zeta potential readings and they were crystalline as per XRD data. According to FTIR analysis, the bio reduction was attributed to alcohol, ethers, carboxylic acids, and esters. The highest anti-bacterial activity was observed against S. aureus and S. typhi whose ZOI diameter was 13 mm at 100?l in both bacteria. The highest anti-fungal activity of silver nanoparticles was observed against A. flavus whose ZOI diameter was 9 mm at 100?l compared to P. chrysogenum which is 3 mm at 100?l. The stem broth did not show any anti-microbial activity for the microbes. Anti-microbial activity of AgNPs is due to its small size and high surface area. Our findings clearly discloses that sizes of silver nanoparticles can be varied by varying the physico-chemical parameters and the small sized nanoparticles so formed are promising antimicrobial agents and has a great potential in various medical applications.

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Silver-Nanoparticles Embedded Pyridine-Cholesterol Xerogels as Highly Efficient Catalysts for 4-nitrophenol Reduction

Materials ◽

10.3390/ma13071486 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1486

Author(s):

Ganesh Shimoga ◽

Eun-Jae Shin ◽

Sang-Youn Kim

Keyword(s):

Silver Nanoparticles ◽

Trisodium Citrate ◽

Environmentally Benign ◽

X Ray Diffraction ◽

Physico Chemical ◽

Efficient Reduction ◽

Nitrophenol Reduction ◽

Uv Visible ◽

Average Size

Two xerogels made of 4-pyridyl cholesterol (PC) and silver-nanocomposites (SNCs) thereof have been studied for their efficient reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of aqueous sodium borohydride. Since in-situ silver doping will be effective in ethanol and acetone solvents with a PC gelator, two silver-loaded PC xerogels were prepared and successive SNCs were achieved by using an environmentally benign trisodium citrate dehydrate reducing agent. The formed PC xerogels and their SNCs were comprehensively investigated using different physico-chemical techniques, such as field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), powdered X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-Vis). The FE-SEM results confirm that the shape of xerogel-covered silver nanoparticles (SNPs) are roughly spherical, with an average size in the range of 30–80 nm. Thermal degradation studies were analyzed via the sensitive graphical Broido’s method using a TGA technique. Both SNC-PC (SNC-PC-X1 and SNC-PC-X2) xerogels showed remarkable catalytic performances, with recyclable conversion efficiency of around 82% after the fourth consecutive run. The apparent rate constant (kapp) of SNC-PC-X1 and SNC-PC-X2 were found to be 6.120 × 10-3 sec-1 and 3.758 × 10-3 sec-1, respectively, at an ambient temperature.

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‘Green’ approach for obtaining stable pectin-capped silver nanoparticles: Physico-chemical characterization and antibacterial activity

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2019.124141 ◽

2020 ◽

Vol 585 ◽

pp. 124141 ◽

Cited By ~ 12

Author(s):

Kseniya Hileuskaya ◽

Alena Ladutska ◽

Viktoryia Kulikouskaya ◽

Aliaksandr Kraskouski ◽

Galina Novik ◽

...

Keyword(s):

Silver Nanoparticles ◽

Antibacterial Activity ◽

Chemical Characterization ◽

Green Approach ◽

Physico Chemical

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Green synthesis of silver nanoparticles and biopolymer nanocomposites: a comparative study on physico-chemical, antimicrobial and anticancer activity

Bulletin of Materials Science ◽

10.1007/s12034-018-1567-5 ◽

2018 ◽

Vol 41 (2) ◽

Cited By ~ 18

Author(s):

Ramasubba Reddy Palem ◽

Shimoga D Ganesh ◽

Zuzana Kronekova ◽

Monika Sláviková ◽

Nabanita Saha ◽

...

Keyword(s):

Silver Nanoparticles ◽

Comparative Study ◽

Green Synthesis ◽

Anticancer Activity ◽

Physico Chemical

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Biosynthetic potential assessment of four food pathogenic bacteria in hydrothermally silver nanoparticles fabrication

Green Processing and Synthesis ◽

10.1515/gps-2019-0033 ◽

2019 ◽

Vol 8 (1) ◽

pp. 629-634 ◽

Cited By ~ 2

Author(s):

Amir Rahimirad ◽

Afshin Javadi ◽

Hamid Mirzaei ◽

Navideh Anarjan ◽

Hoda Jafarizadeh-Malmiri

Keyword(s):

Particle Size ◽

Silver Nanoparticles ◽

Zeta Potential ◽

Pathogenic Bacteria ◽

Heating Time ◽

Synthesis Process ◽

Ag Nps ◽

Physico Chemical ◽

Minimum Particle Size ◽

Particle Size Analyzer

Abstract Silver nanoparticles (Ag NPs) were synthesized using four pathogenic bacterial extracts namely, Bacillus cereus, E. coli, Staphylococcus aureus and Salmonella entericasubsp.enterica. Synthesis process were hydrothermally accelerated using temperature, pressure and heating time of 121°C, 1.5 bar ad 15 min. Physico- chemical characteristics of the fabricated Ag NPs, including, particle size, polydispersity index (PDI), zeta potential, broad emission peak (λmax) and concentration were evaluated using UV-Vis spectrophotometer and dynamic light scattering (DLS) particle size analyzer. Furthermore, main existed functional groups in the provided bacterial extracts were recognized using Fourier transform infrared spectroscopy. The obtained results revealed that two main peaks were detected around 3453 and 1636.5 cm-1, for all bacterial extracts, were interrelated to the stretching vibrations of hydroxyl and amide groups which those had key roles in the reduction of ions and stabilizing of the formed Ag NPs. The results also indicated that, Ag NPs with much desirable characteristics, including minimum particle size (25.62 nm) and PDI (0.381), and maximum zeta potential (-29.5 mV) were synthesized using S. e. subsp. enterica extract. λmax, absorbance and concentration values for the fabricated Ag NPs with this bacterial extract were 400 nm, 0.202% a.u. and 5.87 ppm.

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