scholarly journals Photosynthesis of Carboxymethyl Starch-Stabilized Silver Nanoparticles and Utilization to Impart Antibacterial Finishing for Wool and Acrylic Fabrics

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
M. A. El-Sheikh ◽  
L. K. El Gabry ◽  
H. M. Ibrahim
Keyword(s):  
Silver Nanoparticles ◽  
Bacterial Growth ◽  
Irradiation Time ◽  
Synthesis Method ◽  
Antibacterial Properties ◽  
Spherical Shape ◽  
Inhibition Zone ◽  
Water Soluble ◽  
Carboxymethyl Starch ◽  
Antibacterial Performance

The water soluble photoinitiator (PI) 4-(trimethyl ammonium methyl) benzophenone chloride/UV system is used in the synthesis of silver nanoparticles (AgNPs). Green synthesis method involved using PI/UV system, carboxymethyl starch (CMS), silver nitrate, and water. AgNPs obtained had a spherical shape morphology and a size of 1–7 nm. To impart antibacterial properties, wool and acrylic fabrics were treated with AgNPs obtained. The PI/UV system was further utilized to fix AgNPs onto wool and acrylic fabrics by photocrosslinking to impart durable antibacterial properties. The effect of irradiation time on the antibacterial performance before and after repeated washing cycles was studied. S. aureus (as G +ve) and E. coli (as G −ve) were used to estimate the antibacterial performance of the finished fabrics. The antibacterial performance was directly proportional to the irradiation time but inversely proportional to the number of washing cycles. However, after the 15th washing cycle, samples still have bacteriostatic effect; that is, although they show zero inhibition zone, they cannot be attacked by the bacterial growth and do not inhibit the bacterial growth. AgNPs finished wool fabrics showed more antibacterial activity than those of AgNPs finished acrylic fabrics.

scholarly journals One Step Photopolymerization of N, N-Methylene Diacrylamide and Photocuring of Carboxymethyl Starch-Silver Nanoparticles onto Cotton Fabrics for Durable Antibacterial Finishing

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
M. A. El-Sheikh ◽  
H. M. Ibrahim
Keyword(s):  
Silver Nanoparticles ◽  
Irradiation Time ◽  
Antibacterial Properties ◽  
Inhibition Zone ◽  
Cotton Fabrics ◽  
Wall Structure ◽  
E Coli ◽  
Carboxymethyl Starch ◽  
Antibacterial Performance ◽  
Before And After

The PI/UV system ((4-trimethyl ammonium methyl) benzophenone chloride/UV) was used to synthesize carboxymethyl starch- (CMS-) stabilized silver nanoparticles (AgNPs). AgNPs so prepared had round shape morphology with size of 1–7 nm. The prepared AgNPs were utilized to impart antibacterial finishing for cotton fabrics. The PI/UV system was further utilized to fix AgNPs onto cotton fabrics by photocrosslinking of AgNPs-CMS composite onto cotton fabrics to impart durable antibacterial properties. Effect of irradiation time and incorporating N, N-methylene diacrylamide (MDA) in different concentrations on antibacterial performance before and after repeated washing cycles was studied. S. aureus and E. coli were used to evaluate the antibacterial performance of finished fabrics. The antibacterial performance was directly proportional to the irradiation time and concentration of MDA but inversely proportional to the number of washing cycles. The inhibition zone of S. aureus and E. coli is the same although they are different in the cell wall structure and mode of action due to the nanosize structure formed.

scholarly journals A Novel Photosynthesis of Carboxymethyl Starch-Stabilized Silver Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
M. A. El-Sheikh
Keyword(s):  
Silver Nanoparticles ◽  
Room Temperature ◽  
Colloidal Solution ◽  
Synthesis Method ◽  
Silver Ions ◽  
Water Soluble ◽  
Synthesis Process ◽  
Carboxymethyl Starch ◽  
Round Shape ◽  
First Time

The water soluble photoinitiator (PI) 4-(trimethyl ammonium methyl) benzophenone chloride is used for the first time in the synthesis of silver nanoparticles (AgNPs). A new green synthesis method involves using PI/UV system, carboxymethyl starch (CMS), silver nitrate, and water. A mechanism of the reduction of silver ions to AgNPs by PI/UV system as well as by the newly born aldehydic groups was proposed. The synthesis process was assessed by UV-vis spectra and TEM of AgNPs colloidal solution. The highest absorbance was obtained using CMS, PI and AgNO3concentrations of 10 g/L, 1 g/L, and 1 g/L, respectively; 40°C; 60 min; pH 7; and a material : liquor ratio 1 : 20. AgNPs so-obtained were stable in aqueous solution over a period of three weeks at room temperature (~25°C) and have round shape morphology. The sizes of synthesized AgNPs were in the range of 1–21 nm and the highest counts % of these particles were for particles of 6–10 and 1–3 nm, respectively.

scholarly journals Biosynthesis of CeO2 Nanoparticles Using Egg White and Their Antibacterial and Antibiofilm Properties on Clinical Isolates

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 584
Author(s):  
Shalendra Kumar ◽  
Faheem Ahmed ◽  
Nagih M. Shaalan ◽  
Osama Saber
Keyword(s):  
Bacterial Infections ◽  
Antibacterial Properties ◽  
Spherical Shape ◽  
Inhibition Zone ◽  
Egg White ◽  
Ceo2 Nanoparticles ◽  
Inorganic Materials ◽  
Ambient Conditions ◽  
Uniform Size ◽  
Tem Analysis

Bio-inspired synthesis is a novel and attractive environmentally friendly route to generating inorganic materials. In this work, the preparation of CeO2 NPs using egg white and investigation of their antibacterial properties both in liquid and solid growth medium against Escherichia coli and Staphylococcus aureus bacteria were reported. The CeO2 nanoparticles were characterized using X-ray diffraction (XRD), Field emission transmission electron microscope (FETEM), UV-Vis, Raman, and antibacterial measurements. The results from XRD and TEM analysis showed that the prepared nanoparticles were a single phase in the nano regime (5–7 nm) with spherical shape and uniform size distribution. Optical properties reflected the characteristics peaks of CeO2 in the UV-Vis range with a bandgap ~2.80 eV. The antibacterial activity of the synthesized NPs was achieved under ambient conditions with different bacteria and the results showed that the properties were different for both the bacteria. The highest activity with an inhibition zone of about 22 mm against S. aureus was obtained as compared with the 19 mm zone of inhibition obtained with E.coli. This finding will be of major significance that indicates a possibility to develop CeO2 NPs as antibacterial agents against extensive microorganisms to control and prevent the spread and persistence of bacterial infections.

Study on the Antibacterial Performance of the Antibacterial Shutter Blades

2013 ◽  
Vol 815 ◽  
pp. 333-338
Author(s):  
Ming Li Liu ◽  
Chun Feng Li ◽  
Yun Long Wang ◽  
Kai Lu ◽  
Jiu Yin Pang ◽  
...  
Keyword(s):  
Antibacterial Agent ◽  
Antibacterial Agents ◽  
Drug Loading ◽  
Antibacterial Properties ◽  
Water Soluble ◽  
Single Factor ◽  
Antibacterial Performance ◽  
Loading Amount ◽  
Single Factor Experiment ◽  
Impregnation Solution

This study used Ag-embedded nanoTiO2, xylan and water-soluble Chitosan as antibacterial agents, respectively prepared shutter blades through the treating solution of the different concentration and the different drug loading amount of the poplar veneer. Through a single factor experiment, this paper analyzes that the different antibacterial agent, concentration of antibacterial agent and the drug loading amount have an effect on the antibacterial properties of the shutter blades. The results show that the order of antibacterial performance of the shutter blades impregnated antibacterial agents is the Ag-embedded nanoTiO2, Chitosan, Xylan. Comprehensiv-ely thought the antibacterial properties and economic index, the optimal concentration of the Ag-embedded nanoTiO2 impregnation solution is 1%.

scholarly journals Antibacterial Effectiveness of Syzygium cumini (L.) Skeels Leaves to Escherichia coli pBR322

2021 ◽  
Vol 9 (1) ◽  
pp. 8-14
Author(s):  
Janrigo Klaumegio Mere ◽  
Maria Bintang ◽  
Mega Safithri
Keyword(s):  
Escherichia Coli ◽  
Bacterial Growth ◽  
Bacterial Resistance ◽  
Antibacterial Properties ◽  
Ethanol Extract ◽  
Inhibition Zone ◽  
Ethyl Acetate Fraction ◽  
Resistant Bacteria ◽  
Syzygium Cumini ◽  
Water Fraction

Bacterial resistance is a serious problem that until now still has become a global problem. The search for new antibacterial compounds is needed to overcome this problem. Syzygium cumini (L.) Skeels is a plant known to contain bioactive compounds that can be used as an antibacterial agent. This study aims to explore the leaves of this plant as an antibacterial against Escherichia coli pBR322 resistant bacteria. Based on the antibacterial test results, extracts and leaf fractions of this plant can inhibit bacterial growth. Ethyl acetate fraction at a concentration of 800 ppm showed strong antibacterial activity with an inhibition zone diameter of 10.36±0.02 mm followed by ethanol extract and other fractions, namely 8.43±0.01 mm (ethanol extract), 7.24±0.01 mm (water fraction), and 1.45±0.01 mm (n-hexane fraction). The results of spectrophotometric MIC determination also showed inhibition against bacterial growth, which was marked by a decrease in the absorbance value at the lowest antibacterial concentration of 600 ppm from 0.454 to 0.070 at wavenumber 600 nm after 24 hours of incubation. The decrease in the absorbance value indicated that the antibacterial properties of the plant leaves at this concentration were effective in inhibiting bacterial growth.

scholarly journals Synthesis of Silver Nanoparticles (NPAg) using Andaliman (Zanthoxylum acanthopodium DC.) Fruit Water Extract and Its Application in Indigosol Blue Photodegradation

2019 ◽  
Vol 22 (5) ◽  
pp. 200-205 ◽  
Author(s):  
Gusti Ayu Dewi Lestari ◽  
Iryanti Eka Suprihatin ◽  
James Sibarani
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Irradiation Time ◽  
Synthesis Method ◽  
Water Extract ◽  
Metal Particles ◽  
Blue Dye ◽  
Particle Size Analyzer ◽  
Optimum Ph ◽  
Silver Metal

Silver nanoparticles (NPAg) are silver metal particles that are less than 100 nm in size. NPAg has several advantages, one of which is as a catalyst in the process of photodegradation. NPAg was obtained by reducing AgNO3 using andaliman fruit water extract (Zanthoxylum acanthopodium DC.). This synthesis method is very effective because it is fast, non-toxic and environmentally friendly technology. This research aims to synthesize optimum NPAg and its application in the photodegradation process of Indigosol Blue in the form of volume, irradiation time, and optimum pH. NPAg synthesis was observed using a UV-VIS spectrophotometer while its size was observed using PSA (Particle Size Analyzer). The results showed the best NPAg synthesized using 1x10-3 M AgNO3 at 60°C with average NPAg size of 9.04 nm. NPAg which is formed is stable for ± 35 days. The optimum condition for the photodegradation process was achieved by using 2 mL NPAg 4 hour irradiation at pH 3. From the results of this study it can be concluded that NPAg can to reduce the concentration of Indigosol Blue dye by up to 94.75%.

scholarly journals Characterization of Silver NanoparticleIn SituSynthesis on Porous Sericin Gel for Antibacterial Application

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Gang Tao ◽  
Lina Liu ◽  
Yejing Wang ◽  
Huaipu Chang ◽  
Ping Zhao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Irradiation Time ◽  
Inhibition Zone ◽  
Antimicrobial Activities ◽  
Scanning Calorimetry ◽  
Structure And Property ◽  
Gram Positive Bacteria ◽  
Synthesis Approach

Sericin fromBombyx moricocoon has good hydrophilicity, reaction activity, biocompatibility, and biodegradability, which has shown great potentials for biomedical materials. Here, an ultraviolet light-assistedin situsynthesis approach is developed to immobilize silver nanoparticles on the surface of sericin gel. The amount of silver nanoparticles immobilized on the surface of sericin gel could be regulated by the irradiation time. The porous structure and property of sericin gel were not affected by the modification of AgNPs, as evidenced by the observation of scanning electron microscopy, X-ray diffractometry, and Fourier transform infrared spectroscopy. Differential scanning calorimetry analysis showed that the modification of AgNPs increased the thermal stability of sericin gel. The growth curve of bacteria and inhibition zone assays suggested that the sericin gel modified with AgNPs had good antimicrobial activities against both Gram-negative and Gram-positive bacteria. This novel sericin has shown a great potential for biomedical purpose.

scholarly journals Fouling Weight Quantification in Antibacterial Polymeric Membrane During Protein Washwater Ultrafiltration–Synergetic Effects of Silver Nanoparticles and Chitosan

2020 ◽  
Vol 11 (3) ◽  
pp. 10371-10380
Keyword(s):  
Silver Nanoparticles ◽  
Synergistic Effect ◽  
Bacterial Growth ◽  
Membrane Surface ◽  
Antibacterial Properties ◽  
Wash Water ◽  
Polymeric Membrane ◽  
Chitosan Membrane ◽  
Model Protein ◽  
Pes Membrane

Controlling biofouling caused by bacterial growth onto the membrane surface and pores is essential when dealing with protein-based solutes to reduce cost and environmental impacts. Thus, this study was carried out to determine the effect of silver nanoparticles on fouling occurrence during surimi wash water ultrafiltration. Silver nanoparticles and chitosan were chosen as a bacteria inhibitor due to its remarkable antibacterial properties. The fouling weight represented the number of foulants attached to the membrane. These experiments were conducted by using the native PES membrane in comparison with the PES-Ag membrane, PES-Chitosan membrane, and PES-Ag-Chitosan membrane at a controlled condition where surimi wash water applied as a model protein. Foulant weight was significantly reduced by 56% for the PES-Ag-Chitosan membrane as compared to other membranes. It also indicates that silver nanoparticles and chitosan have the synergistic effect in overcoming the fouling contributed by both solutes depositions and bacterial growth as the total fouling weight of PES-Ag-chitosan is reduced almost 53% and 50% as compared to employing only chitosan and only silver nanoparticles, respectively.

scholarly journals Synthesis and Characterization of Silver Nanoparticles for Antibacterial Application against Bacillus Subtilis and Pseudomonas Aeruginosa

2021 ◽  
Vol 37 (2) ◽  
Author(s):  
Pham Thi Thu Ha ◽  
Vu Xuan Hoa ◽  
Trinh Dinh Kha ◽  
Nguyen Dac Dien ◽  
Luong Duy Thanh ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Silver Nanoparticles ◽  
Bacillus Subtilis ◽  
Trisodium Citrate ◽  
Inhibition Zone ◽  
Tem Analysis ◽  
High Antibacterial Activity ◽  
Antibacterial Performance ◽  
Transmission Electron ◽  
Zones Of Inhibition

In this study, the stable silver nanoparticles (AgNPs) were synthesized by reducing silver nitrate (AgNO3) using trisodium citrate (TSC). The product was characterized by Ultraviolet-Visible spectroscopy, Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD). UV-Vis spectrum showed a peak around 420 nm. TEM analysis revealed the homogeneity in the size of AgNPs (35-45 nm), well-dispersed quasi-spherical in water. The prepared AgNPs exhibited high antibacterial activity against Bacillus subtilis and Pseudomonas aeruginosa bacteria. The average zones of inhibition were 20 mm and 17 mm for Pseudomonas aeruginosa and Bacillus subtilis bacteria, respectively. The inhibition zone of AgNPs was also compared to the reference antibiotics drugs such as ampicillin and natamycin. This research exhibits an efficient and eco-friendly synthesis of silver nanoparticles with potent antimicrobial and antibacterial performance.

scholarly journals Synthesis of silver nanoparticles stabilized by the products of mechanically assisted hydrolysis of yeast biopolymers

2019 ◽  
Vol 81 (1) ◽  
pp. 238-246
Author(s):  
A. L. Bychkov ◽  
E. I. Ryabchikova ◽  
K. G. Korolev ◽  
V. A. Bukhtoyarov
Keyword(s):  
Silver Nanoparticles ◽  
Spherical Shape ◽  
Water Soluble ◽  
Carbonyl Groups ◽  
Silver Particles ◽  
Yeast Biomass ◽  
Reducing Ability ◽  
Hydrolysis Of ◽  
By Products

The paper presents data on the production of silver nanoparticles and their stabilization by products of the mechanoenzymatic hydrolysis of yeast biomass. The formation of silver nanoparticles by reduction using glucose without the addition of stabilizers was studied. The particles obtained have a spherical shape and a narrow size distribution. The resulting colloid is unstable and precipitates after 3-5 hours due to aggregation of unstabilized particles. Polymers contained in yeast hydrolyzates were selected taking into account silver particles nucleation mechanism. The protein molecules of these hydrolysates are involved in the formation of salts and the stabilization of the resulting dendrites. Low-molecular carbohydrates play the role of a reducing reagent. The peak on the Vis spectrum at 420 nm attributed to particles with dimensions of about 50 nm gives evidence that these dendritic formations are nanostructured. It was shown that mechanical activation together with enzymatic hydrolysis promotes an increase in the concentration of carbonyl groups of carbohydrates leading to an increase in the regenerating ability of the cell wall. The varying the processing conditions one can get silver particles in the range of 15-80 nm. Changes in silver reduction in the liquid phase in the presence of cell hydrolysis products were detected. Part of the carbohydrates as a result of hydrolysis becomes water soluble and is extracted into the solution. This leads to the fact that in the extracellular space also undergo reduction processes. In general, samples of the mechanically processed and hydrolyzed enzyme product have a greater reducing ability compared with the original cells. The quantity of spatially stabilized nanoparticles is larger than when processing native S. cerevisiae cells.

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