Green Synthesis of Silver Nanoparticles and Study of Their Antimicrobial Properties

Siddiqui, Mohammad Nahid; Redhwi, Halim Hamid; Achilias, Dimitris S.; Kosmidou, Elena; Vakalopoulou, Efthymia; Ioannidou, Maria

doi:10.1007/s10924-017-0962-0

Cited by 54 publications

(28 citation statements)

References 50 publications

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“…The antimicrobial impact of Ag can be expanded by controlling their size at the nano level. Due to the rapid progress in the optimization process, Ag nanoparticles have emerged as potential antimicrobial agents due to their high surface area to volume ratio and unique physiochemical properties [20]. Ag nanoparticles with sizes ranging from 10 to 100 nm have shown very effective antimicrobial behaviors against both gram-positive and gram-negative bacteria [57,58].…”

Section: Discussionmentioning

confidence: 99%

“…The nanoparticles preferably attack the respiratory chain, cell division and finally lead to cell death. The Ag ions are released by the nanoparticles inside the bacterial cells, which intensify their bactericidal activity [20]. Aside from its major use as an antimicrobial agent, Ag nanoparticles are recognized to have the toxic effects in many different species.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of the biological synthesis of silver nanoparticles using Penicillium oxalicum GRS-1 and their antimicrobial effects against common food-borne pathogens

Rose

Soni²,

Rishi

et al. 2019

Green Processing and Synthesis

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Biologically synthesized nanoparticles are gaining importance as they offer several advantages, such as the ease with which they can be scaled up, the cost-effectiveness of the process and the green route of production. In this study, silver (Ag) nanoparticles were biosynthesized using the cellular extract of Penicillium oxalicum GRS-1 and then characterized by ultraviolet visible spectroscopy, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy. The biosynthesis of nanoparticles was optimized by following the one factor at a time approach, wherein the temperature of 60°C, pH 7.0 and 1.5 mm silver nitrate (AgNO3) concentration were found to be most favorable factors for the production of Ag nanoparticles. Upon statistical optimization, the maximum production of Ag nanoparticles with a concentration of 136 ppm was achieved at pH 7.2, AgNO3 concentration 1.975 mm and 86 h using the crude cellular extract of P. oxalicum GRS-1 having nitrate reductase activity. TEM analysis showed that the Ag nanoparticles were spherical in shape with sizes ranging from 10 to 40 nm. The biosynthesized nanoparticles showed strong antimicrobial activity against the common food-borne, pathogens including Staphylococcus aureus, Escherichia coli and Salmonella typhimurium with respective minimum bactericidal concentrations of 32, 16 and 32 μg/ml.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of the biological synthesis of silver nanoparticles using Penicillium oxalicum GRS-1 and their antimicrobial effects against common food-borne pathogens

Rose

Soni²,

Rishi

et al. 2019

Green Processing and Synthesis

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“…We studied the roles of d ‐glucose and d ‐fructose to reduce the Ag + and their ability to act as a capping agent on AgNPs surface. Few works in bibliography identify the molecules that are responsible for stabilization of AgNPs during their synthesis, whereas mainly adsorbed honey sugars and its preferential geometries on AgNPs are usually not studied in depth.…”

Section: Introductionmentioning

confidence: 99%

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Fá

López–Corral

Faccio

et al. 2018

J Raman Spectroscopy

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The role of α‐ and β‐d‐glucose, and d‐gluconate anion, acting as capping agent, on silver nanoparticles (AgNPs) was evaluated using both Raman and density functional theory studies. The particles were synthetized employing glucose, as reducing and blocking agent, in alkaline conditions. Capping agents were characterized through surface enhancement Raman spectroscopy together with modeling performed using silver clusters. Several geometries were optimized, and its energies and wavenumbers were calculated for each of them. Vibration normal modes from d‐glucose isomers and d‐gluconate were obtained and compared with those reported in bibliography, showing a satisfactory correlation. Comparison between experimental and calculated frequencies reveals a preference for d‐gluconate anion acting as capping agent under the necessary presence of d‐glucose on the surface of the AgNPs. The study of energies shows a greater affinity of d‐gluconate for the silver atoms (above −1.3 eV for both geometries) than for other configurations of the glucose molecule (about −0.66 eV in the case of α‐d‐glucose).

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“…The sustained increase in UV‐vis absorbance observed up to 3 h at a much higher level at pH 10 than pH 8 as well as the low level of 0.78% insoluble material remaining shows the strong dependence on pH of the reduction by glucose. Sodium hydroxide is regarded as an accelerator when sugars are used as the reductant, and in general reaction rates increase with pH . Since the reduction of Ag + was not as rapid at the lower pH of 8, more of the remaining complexed palmitate would remain as the silver salt after the 4 h reduction with glucose at 95–97 °C.…”

Section: Resultsmentioning

confidence: 99%

“…Likewise, starch has become the capping agent of choice due to its low cost and its commercial availability in a soluble form . Numerous papers have been published describing various factors and options for the green synthesis of Ag NPs, including several reviews . Although many of these studies report that Ag NP preparations are stable in storage, typically for 90 days, one aspect of the technology that has not been reported is the long‐term storage of prepared Ag NPs with known properties in an easily reconstituted, dry form.…”

Section: Introductionmentioning

confidence: 99%

Glucose-Reduced Silver Nanoparticles Prepared with Amylose-Sodium Palmitate Inclusion Complexes and Their Dry Storage and Reconstitution

2019

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Methods for producing silver nanoparticles for antimicrobial and other applications using green chemistry approaches have many variables that affect their properties. The authors have previously shown that using amylose‐sodium palmitate inclusion complexes enabled exchange of silver ions with the sodium ions of the complexed sodium palmitate, leading to production of smaller nanoparticles than those obtained with soluble starch. In this study, silver nitrate, glucose, and sodium hydroxide are added to aqueous solutions of complexes to generate silver nanoparticles with average diameters of 3.45–3.94 nm. When waxy starch is used, which contains no amylose, the reduction reactions did not progress beyond 1 h and silver nanoparticles are larger (14.5 nm). Acidification to pH 3.5 of nanoparticles prepared with amylose complexes results in microgel formation, and when these gel fragments are freeze‐dried and reconstituted, TEM reveal nanoparticles averaging 3.69 nm within the hydrated gel fragments. This procedure enables the silver nanoparticles to be stored in a dry state and later reconstituted in water to obtain silver nanoparticles with known characteristics, making de novo synthesis of silver nanoparticles from the starting materials unnecessary. This novel approach will facilitate the incorporation of silver nanoparticles into a variety of products.

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Green Synthesis of Silver Nanoparticles and Study of Their Antimicrobial Properties

Cited by 54 publications

References 50 publications

Optimization of the biological synthesis of silver nanoparticles using Penicillium oxalicum GRS-1 and their antimicrobial effects against common food-borne pathogens

Optimization of the biological synthesis of silver nanoparticles using Penicillium oxalicum GRS-1 and their antimicrobial effects against common food-borne pathogens

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Glucose-Reduced Silver Nanoparticles Prepared with Amylose-Sodium Palmitate Inclusion Complexes and Their Dry Storage and Reconstitution

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