Green synthetic approach for starch capped silver nanoparticles and their antibacterial activity

2016 ◽  
Vol 88 (1-2) ◽  
pp. 61-69 ◽  
Author(s):  
Precious Nokwethemba Sibiya ◽  
Thokozani Xaba ◽  
Makwena Justice Moloto
Keyword(s):  
Silver Nanoparticles ◽  
Synthesis Method ◽  
Spherical Shape ◽  
Cubic Phase ◽  
Hydroxyl Groups ◽  
Synthetic Approach ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Transmission Electron ◽  
Average Size

AbstractIn this work silver nanoparticles (AgNPs) have been prepared from silver nitrate (AgNO3) precursor using a green synthesis method at room temperature. Starch with its abundance of hydroxyl groups and its biocompatibility was used as a capping and reducing agent. The formation of AgNPs was confirmed by absorption spectroscopy with the surface plasmon resonance peak at 400 nm. The sharp reflection at (111), (200), (220) and (311) was observed by powder X-ray diffraction (XRD), which indicated the presence of cubic phase AgNPs. Transmission electron microscopy (TEM) revealed that the average size of AgNPs were between 0.5 and 4 nm with a spherical shape under optimum conditions. The nanoparticles showed a decrease in size with an increase in precursor concentration as well as the increase in capping agent concentration. The nanoparticles also showed to be bactericidal towards the tested Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria.

scholarly journals SINTESIS NANOPARTIKEL PERAK DENGAN METODE BIOLOGI MENGGUNAKAN EKSTRAK TANAMAN SAMBILOTO (Andrographis paniculata Ness)

2017 ◽  
Vol 18 (1) ◽  
pp. 6
Author(s):  
Septiana Ribka Purnomo ◽  
Ni Nyoman Rupiasih ◽  
Made Sumadiyasa
Keyword(s):  
Silver Nanoparticles ◽  
Lattice Parameter ◽  
Andrographis Paniculata ◽  
Surface Plasmon Resonance Peak ◽  
X Ray Diffraction ◽  
Plasmon Resonance Peak ◽  
Agno3 Solution ◽  
Transmission Electron ◽  
Diffraction Peaks

This study is report about the synthesis of silver nanoparticles (AgNP) using biological method (biosynthesis) using sambiloto plant extracts (Andrographis paniculata Ness). Plant part used is the leaves and extract process is done with demineralized water (aqua-dm). The synthesis is done at a ratio of AgNO3 solution with sambiloto extract solution is 10 µl : 10 ml. Characterization techniques that have been made include UV-Vis spectrophotometer, X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). The results showed that silver nanoparticles formed has absorbance of SPR (surface plasmon resonance) peak at a wavelength of about 423 nm. XRD characterization of the structure obtained FCC (face center cubic) with a lattice parameter is 4.031 Å, diffraction peaks at 2q = 38,18o, 45,81o and 64,87o each corresponding to the (h k l) of (1 1 1), (2 0 0) and (2 2 0) respectively. TEM characterization obtained that the particle size distribution is 10 – 30 nm.

scholarly journals Synthesis and Biological Activity of Silver Nanoparticles from Medicinal Palm Tree Bismarckia nobilis Seeds

2020 ◽  
Vol 32 (9) ◽  
pp. 2229-2232
Author(s):  
TANVEER ALAM ◽  
SAPNA TYAGI ◽  
GOUTAM KUMAR ◽  
AZHAR KHAN ◽  
NEHA CHAUHAN ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Photochemical Activity ◽  
Cubic Phase ◽  
Palm Tree ◽  
X Ray Diffraction ◽  
Anticancer Activities ◽  
Transmission Electron ◽  
Crystalline Nature ◽  
Average Size ◽  
Significant Attention

Silver nanoparticles (AgNPs) have received significant attention due to their distinctive antimicrobial, anticancer, catalytic and photochemical activity. The objective of this work is to amalgamate silver nanoparticles from the aqueous extract of Biamarckia nobilis seeds using green method, characterization using UV-visible spectroscopy, X-ray diffraction, transmission electron microscopy and FTIR spectroscopy. Further, its antimicrobial and anticancer activities were evaluated. The results displayed the characteristic UV peak, cubic phase with crystalline nature, spherical in shape having average size 14 nm, prominent peaks of bio-functional groups, good antimicrobial and anticancer activities.

scholarly journals Ecofriendly synthesis of silver nanoparticles from leaves extract of Phyllanthus niruri (L.) and their antibacterial properties

2019 ◽  
Vol 9 (1-s) ◽  
pp. 196-200
Author(s):  
G Amalorpavamary ◽  
G Dineshkumar ◽  
K Jayaseelan
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Antibacterial Properties ◽  
Good Alternative ◽  
Diffusion Method ◽  
Surface Plasmon Resonance Peak ◽  
Phyllanthus Niruri ◽  
Plasmon Resonance Peak ◽  
Synthesis Of Nanoparticles ◽  
Average Size

In recent times, plant-mediated synthesis of nanoparticles has garnered wide interest owing to its inherent features such as rapidity, simplicity, eco-friendliness and cheaper costs. For the first time, silver nanoparticles were successfully synthesized using Phyllanthus niruri leaf extract in the current investigation. The silver nanoparticles were characterized by UV–Vis spectrophotometer and the characteristic surface plasmon resonance peak was identified to be 423 nm. The morphology of the silver nanoparticles was characterized by scanning electron microscopy (SEM). The size of the silver nanoparticles was found to be 10-50 nm, with an average size 15 nm.  FTIR analysis was done to identify the functional groups responsible for the synthesis of the AgNPs. The antibacterial potential of synthesized AgNPs was compared with that of aqueous extracts of P.niruri by well diffusion method. The AgNPs at 50µl concentration significantly inhibited bacterial growth against A.hydrophila (16 ± 0.09 mm). Thus AgNPs showed broad spectrum antibacterial activity at lower concentration and may be a good alternative therapeutic approach in future. Keywords: Phyllanthus niruri, AgNps, Aeromonas hydrophila, Antibacterial Activity.

Biosynthesis of Silver Nanoparticles Using Licorice Extract and Evaluation of their Antioxidant Activity

2019 ◽  
Vol 70 (11) ◽  
pp. 4053-4056
Keyword(s):  
Antioxidant Activity ◽  
Silver Nanoparticles ◽  
Radical Scavenging ◽  
Spherical Shape ◽  
Root Extract ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Stabilizing Agents ◽  
Vis Spectroscopy ◽  
Licorice Extract

This paper presents a simple and eco-friendly method for the synthesis of silver nanoparticles (AgNPs) using licorice (Glycyrrhiza glabra) root extract and the evaluation of their antioxidant activity. UV-Vis spectroscopy, FTIR, TEM and EDX methods were used to characterize the AgNPs. The UV-Vis spectrum shows the characteristic surface plasmon resonance peak at 430 nm. The synthesized AgNPs have a spherical shape and are capped by biomolecules. Furthermore, FTIR spectra and EDX analysis demonstrate the presence of phytochemicals from extract which act as reducing and stabilizing agents. The presence of elemental silver was demonstrated by the peak at 3 keV from EDX spectra. The results following the DPPH free radical scavenging assay suggest that AgNPs present a better antioxidant activity compared to that of the extract. Therefore, the obtained results confirm that licorice represents a source of biomolecules that can be used for synthesizing AgNPs with antioxidant potential. Keywords: licorice, green synthesis, silver nanoparticles, antioxidant activity

Preparation of Silver Nanoparticles in Poly(N-vinylpyrrolidone)/Ethanol Solutions

2017 ◽  
Vol 16 (05n06) ◽  
pp. 1750008 ◽  
Author(s):  
Shu Zhang ◽  
Yongan Tang ◽  
Branislav Vlahovic
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Weight Ratio ◽  
Plasmon Resonance Peak ◽  
X Ray ◽  
Transmission Electron ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Average Size

Silver nanoparticles have been synthesized from Poly(N-vinylpyrrolidone) (PVP)/ethanol solutions, and six different PVP to silver nitrate weight ratios (PVP:AgNO3) are studied in reduction of silver nitrate in ethanol with the presence of PVP as a stabilizer. The produced silver nanoparticles showed strong plasmon resonance peak centered at around 405[Formula: see text]nm in UV-Vis spectra. The particle morphologies were also examined and compared under secondary electron microscopy (SEM) and transmission electron microscopy (TEM). Energy dispersion X-ray spectroscopy (EDX) was utilized to determine the formation of silver nanoparticles. We found that the particle size and morphology were strongly dependent on the PVP:AgNO3 weight ratio. The average size of silver particles decreased from 19.25[Formula: see text]nm to 10.03[Formula: see text]nm as the weight ratio of PVP:AgNO3 increased from 1:1 to 20:1.

scholarly journals Síntesis de nanopartículas de plata reducidas con desecho producido por el insecto Ulomoides dermestoides

2019 ◽  
pp. 29-36
Author(s):  
Isabel Ramos-Villa ◽  
Diego Alberto Lomelí-Rosales ◽  
Sandra Fabiola Velasco-Ramírez ◽  
Gilberto Velazquez-Juarez
Keyword(s):  
Electron Microscopy ◽  
Amino Acids ◽  
Silver Nanoparticles ◽  
Colloidal Solution ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Transmission Electron ◽  
The Family ◽  
Darkling Beetles ◽  
Shape Of Nanoparticles

The scale of nanotechnology goes from 0.2 nm to approximately 100 nm and is used in many different disciplines. U.dermestoides is a beetle belonging to the family Tenebrionidae,commonly known as darkling beetles, it has phytophagous habits. In its waste have been identified the following organic compounds: Saponins, coumarins, steroids, phenols, alkaloids, proteins and amino acids. The synthesis of silver nanoparticles was done using colloidal solution from the reduction of silver nitrate at different concentrations, using U. dermestoides waste from three different diets: Rye and Apple; oats, bread and Apple and finally bread and Apple. Series of qualitative tests were done to determinate the presence of phenols, alkaloids carbohydrates, proteins and amino acids. UV-vis spectrophotometry was used in a range from 200 to 800 nm. The results show that between 400-450 nm there is a surface plasmon resonance peak, indicating the formation of silver nanoparticles. By scanning electron microscopy (SEM) the presence of spherical silver nanoparticles was observed and by transmission electron microscopy (TEM) was confirmed the presence and shape of nanoparticles.

scholarly journals Phytochemical Mediated Synthesis of Silver Nanoparticles using Musa paradisiaca Peduncle Latex and Its Photocatalytic and Antimicrobial Activity

2018 ◽  
Vol 4 (5) ◽  
pp. 503-507
Author(s):  
B. Venkataramana ◽  
S. Siva Sankar ◽  
A. Saikumar ◽  
B. Vijaya Kumar Naidu
Keyword(s):  
Electron Microscopy ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Bacterial Species ◽  
Spherical Shape ◽  
Blue Dye ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
X Ray ◽  
Musa Paradisiaca

In the present work, green synthesis of silver nanoparticles (AgNPs) using a natural phytochemical agent has been described. The aqueous latex from Musa paradisiaca peduncle has been utilized as reducing as well as stabilizing agent. The formation of AgNPs was optimized by varying latex and AgNO3 concentrations and finally reaction time. Ultraviolet-visible spectroscopic analysis showed the surface plasmon resonance peak between 350 and 450 nm confirms the formation of silver nanoparticles. X-ray powder diffraction analysis revealed the crystalline nature of AgNPs, Fourier transform infrared spectroscopy analysis revealed that AgNPs were stabilized by polyphenols and other aromatics present in the Musa Paradisiaca peduncle latex, while X-ray energy dispersive spectroscopy confirms the metallic nature. The field emission scanning electron microscopy and high resolution transmission electron microscopy showed the spherical shape of the particles and size distribution of AgNPs measured by dynamic light scattering which are in the range of 40 to 50 nm. The synthesized AgNPs showed photocatalytic activity on the degradation / removal of the methylene blue dye and the antimicrobial activity against Pseudomonas aeruginosa, Staphylococcus aureus and Klebseilla bacterial species.

scholarly journals Biosynthesis of Silver Nanoparticles Using Licorice Extract and Evaluation of their Antioxidant Activity

2019 ◽  
Vol 70 (11) ◽  
pp. 4053-4056
Author(s):  
Andreia Corciova ◽  
Ana Flavia Burlec ◽  
Ana Maria Gheldiu ◽  
Adrian Fifere ◽  
Ana Lacramioara Lungoci ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Silver Nanoparticles ◽  
Radical Scavenging ◽  
Spherical Shape ◽  
Root Extract ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Stabilizing Agents ◽  
Vis Spectroscopy ◽  
Licorice Extract

This paper presents a simple and eco-friendly method for the synthesis of silver nanoparticles (AgNPs) using licorice (Glycyrrhiza glabra) root extract and the evaluation of their antioxidant activity. UV-Vis spectroscopy, FTIR, TEM and EDX methods were used to characterize the AgNPs. The UV-Vis spectrum shows the characteristic surface plasmon resonance peak at 430 nm. The synthesized AgNPs have a spherical shape and are capped by biomolecules. Furthermore, FTIR spectra and EDX analysis demonstrate the presence of phytochemicals from extract which act as reducing and stabilizing agents. The presence of elemental silver was demonstrated by the peak at 3 keV from EDX spectra. The results following the DPPH free radical scavenging assay suggest that AgNPs present a better antioxidant activity compared to that of the extract. Therefore, the obtained results confirm that licorice represents a source of biomolecules that can be used for synthesizing AgNPs with antioxidant potential.

scholarly journals Synthesis of biogenic silver nanoparticles from the seed coat waste of pistachio (Pistacia vera) and their effect on the growth of eggplant

2021 ◽  
Vol 10 (1) ◽  
pp. 1789-1800
Author(s):  
Masudulla Khan ◽  
Azhar U. Khan ◽  
Il Soo Moon ◽  
Raed Felimban ◽  
Raed Alserihi ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Fly Ash ◽  
Plant Growth ◽  
Seed Coat ◽  
Silver Ions ◽  
Active Surface ◽  
Surface Plasmon Resonance Peak ◽  
Nanoparticle Suspension ◽  
Plasmon Resonance Peak ◽  
Average Size

Abstract Herein, the synthesis of silver nanoparticles using extracts of pistachio seed coat waste is investigated. The surface plasmon resonance peak at 443 nm was observed in the nanoparticles by using ultraviolet-visible spectroscopy (UV-Vis). To identify potential biomolecules involved in the bio-reduction of silver ions, Fourier-transform infrared spectroscopy (FTIR) was used. Scanning and transmission electron microscopy (SEM and TEM) show irregular shapes with an average size of ∼20 nm. The active surface determined by Brunauer, Emmett, and Teller analysis was 22 m2/g. The effect of silver nanoparticles on eggplants sprayed with a nanoparticle suspension of 75 mg/L led to increased plant growth and chlorophyll and carotenoid contents. The fly ash addition to the soil promoted plant growth. The highest increase in plant growth occurs when plants were sprayed with 75 ppm AgNPs in 20% fly ash amended soil.

scholarly journals Polyvinyl Alcohol Food Packaging System Comprising Green Synthesized Silver Nanoparticles

2020 ◽  
Author(s):  
Ahmed Elsayed Abdelhamid ◽  
Eman AboBakr Ali Yousif ◽  
Manal Mohamed Talaat El-Saidi ◽  
Ahmed Ali El-Sayed
Keyword(s):  
Silver Nanoparticles ◽  
Polyvinyl Alcohol ◽  
Food Packaging ◽  
Water Vapor Permeability ◽  
Spherical Shape ◽  
Antibacterial Activities ◽  
Vapor Permeability ◽  
Transmission Electron ◽  
Visible Spectra ◽  
Average Size

Green synthesis of silver nanoparticles (AgNPs) using aqueous Moringa extract and their incorporation in polyvinyl alcohol (PVA) as food packaging materials have been performed. The prepared nanoparticles were characterized via Ultraviolet-visible spectra and transmission electron microscope, and the results revealed the formation of silver nanoparticles in a semi-spherical shape with an average size ranged from 2 to 5 nm. The addition of different ratios of the nanoparticles onto the PVA matrix and their crosslinking via citric acid to obtain nanocomposite sheets were performed. The nanocomposite sheets were characterized using FT-IR, UV-Vis, and TGA. In addition, their mechanical properties were evaluated. Water vapor permeability rate and water content were also determined. The composite sheets showed good thermal and optical performance. Antibacterial activities of the prepared nanocomposite sheets were evaluated, and the results exhibited good resistance to bacterial growth.

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