What happens to the silver ions? – Silver thiocyanate nanoparticle formation in an artificial digestion

Abstract. Research relevance: low molecular weight supramolecular hydrogels are unique objects that can solve many pressing problems in medicine, food industry and other sectors of the national economy. Research objectives: in recent past, it was discovered that low-concentration solutions of L-cysteine and silver nitrate (CSN) can form, when electrolyte solutions are added to hydrogels. We were faced with the task of obtaining hydrogels from dilute solutions of glycyram (GC) by adding CSN, since GC, due to its poor solubility, has low bioavailability. Materials and research methods: using the method of isomolar series, a comparative study of the formation of hydrogels by dilute GC solutions with the addition of CSN and GCP was carried out. It has been found that most durable hydrogels were obtained using CSN. Thus, GC hydrogels were obtained at a concentration of 10−3 M after adding CSN and GCP, which have a supramolecular character and combine the properties of GC, amino acids, and silver ions. Research results: glycyram hydrogels were obtained at its concentration equal to 10−3 M by mixing it with silver amino acids L-cysteine (CSN) and L-glutamic acid (GCP) solutions in same low concentrations. Conclusions: hydrogels with glycyram form silver solutions of those amino acids that are capable of giving frame structures at a ratio of amino acid: silver nitrate of 1.25.

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Pretreated Lignocellulosic Waste Mediated Biosynthesis of Silver Nanoparticles Under Room Temperature

International Journal of Nanoscience ◽

10.1142/s0219581x16600012 ◽

2016 ◽

Vol 15 (05n06) ◽

pp. 1660001 ◽

Cited By ~ 1

Author(s):

V. P. Manjamadha ◽

Karuppan Muthukumar

Keyword(s):

Silver Nanoparticles ◽

Silver Nitrate ◽

Room Temperature ◽

Nitrate Solution ◽

Silver Ions ◽

Silver Nitrate Solution ◽

Morphological Characterization ◽

Alternative Source ◽

X Ray ◽

Antibacterial Performance

The current work elucidates the utilization of biowaste as a valuable reducing agent for the synthesis of silver nanoparticles. In this study, the wastewater generated during the alkaline pretreatment of lignocellulosic wastes (APLW) was used as a bioreductant to reduce silver nitrate under room temperature. Synthesis of stable silver nanoparticles (AgNPs) was achieved rapidly on addition of APLW into the silver nitrate solution (1[Formula: see text]mM). The morphological characterization of AgNPs was performed using field emission scanning electron microscopy (FESEM). The micrograph clearly depicted the presence of spherical AgNPs. The presence of elemental silver along with biomoilties was determined using energy dispersive X-ray spectroscopy (EDAX) analysis. The X-ray diffraction (XRD) study proved the crystalline form of stable AgNPs. The AgNPs exhibited excellent antibacterial performance against Gram negative organism. The immediate bioreduction of silver ions using APLW was well illustrated in the present study. Thus, APLW serve as an alternative source for reducing agents instead of utilizing valuable medicinal plants for nanoparticles synthesis.

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Two Modes of Nanoleakage Expression in Single-step Adhesives

Journal of Dental Research ◽

10.1177/154405910208100708 ◽

2002 ◽

Vol 81 (7) ◽

pp. 472-476 ◽

Cited By ~ 359

Author(s):

F.R. Tay ◽

D.H. Pashley ◽

M. Yoshiyama

Keyword(s):

Silver Nitrate ◽

Silver Ions ◽

Single Step ◽

Mineral Dissolution ◽

Resin Infiltration ◽

Transmission Electron ◽

Hybrid Layers ◽

Self Etch ◽

Ammoniacal Silver ◽

Spotted Pattern

Self-etch adhesives that etch, prime, and bond simultaneously should not exhibit incomplete resin infiltration within hybrid layers. We hypothesized that nanoleakage patterns in these systems are artifacts caused by mineral dissolution in mildly acidic silver nitrate. Resin-dentin interfaces bonded with four single-step, self-etch adhesives were examined for nanoleakage by conventional (pH 4.2) and basic ammoniacal (pH 9.5) silver nitrate and prepared for transmission electron microscopy. All adhesives exhibited a reticular mode of nanoleakage within hybrid layers when conventional silver nitrate was used. With ammoniacal silver nitrate, an additional spotted pattern of nanoleakage was observed within adhesive and hybrid layers. The reticular mode of nanoleakage in self-etch adhesives probably represents sites of incomplete water removal that leads to regional suboptimal polymerization. The spotted pattern identified with the use of ammoniacal silver nitrate probably represents potentially permeable regions in the adhesive and hybrid layers that result from the interaction of the basic diamine silver ions with acidic/hydrophilic resin components.

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VAPOR PRESSURES OF AQUEOUS SOLUTIONS OF SILVER NITRATE, OF AMMONIUM NITRATE, AND OF LITHIUM NITRATE

Canadian Journal of Chemistry ◽

10.1139/v56-019 ◽

1956 ◽

Vol 34 (2) ◽

pp. 151-159 ◽

Cited By ~ 26

Author(s):

A. N. Campbell ◽

J. B. Fishman ◽

G. Rutherford ◽

T. P. Schaefer ◽

L. Ross

Keyword(s):

Aqueous Solutions ◽

Silver Nitrate ◽

Direct Determination ◽

Lithium Ion ◽

Silver Ions ◽

Lithium Nitrate ◽

Vapor Pressures ◽

Heats Of Dilution ◽

Water Of Hydration

This paper is devoted to the direct determination of the vapor pressures of solutions of the nitrates of silver, of ammonium, and of lithium, at temperatures varying from 30 °C. to 105 °C. and at concentrations varying from 10 to 85 weight % (for lithium nitrate, the limited solubility precluded measurements beyond 65%). From the vapor pressures, the enthalpies of evaporation of water (by a modification of the Clapeyron–Clausius equation), the differential heats of dilution, and the activities of water (as compared with the mole fractions of the solvent) have been calculated. From the results we conclude that the water of hydration of the ammonium and silver ions (if, indeed, these ions are hydrated at all) is very loosely attached, while that of the lithium ion is strongly bound.

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SILVER – SILVER ION EXCHANGE REACTIONS

Canadian Journal of Chemistry ◽

10.1139/v53-046 ◽

1953 ◽

Vol 31 (4) ◽

pp. 319-327 ◽

Cited By ~ 3

Author(s):

A. Baerg ◽

C. A. Winkler

Keyword(s):

Ion Exchange ◽

Silver Nitrate ◽

Surface Area ◽

Nitrate Solution ◽

Silver Ions ◽

Silver Nitrate Solution ◽

Ionic Form ◽

Exchange Reactions ◽

Planar Area ◽

Silver Silver

The extent of the exchange between silver foils and silver ions in nitrate solution was compared with surface area measurements made by the Bowden-Rideal method. No quantitative correspondence between the two measurements was observed. During one hour the exchange with mechanically abraded surfaces affected about 30 apparent atomic layers of the metal, but this was reduced to about one-half this value when the surfaces were equilibrated for several days in inactive silver nitrate. Etched foils exchanged during one hour to a.depth of only about 2 apparent atomic layers and this was not affected by equilibration. Bowden-Rideal area measurements gave values of roughly 7 and 15 times the planar area for etched and abraded specimens respectively. These values were not altered by equilibration of the surfaces. Only about 50% of the acquired radioactivity was subsequently removable in inactive silver nitrate solution. Part of the measured radioactivity was present on the surface in adsorbed ionic form and was not removable by a simple water wash. The magnitude of this adsorbed activity was found to be measurable electrometrically.

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Development of a GFP Fluorescent Bacterial Biosensor for the Detection and Quantification of Silver and Copper Ions

10.1101/296079 ◽

2018 ◽

Cited By ~ 1

Author(s):

Adam R. Martinez ◽

John R. Heil ◽

Trevor C. Charles

Keyword(s):

Environmental Monitoring ◽

Copper Ions ◽

Silver Ions ◽

Silver Ion ◽

Resistant Bacteria ◽

Ion Release ◽

Ionic Silver ◽

Wide Range ◽

Further Development ◽

Detection And Quantification

AbstractIonic silver is known to be an effective antimicrobial agent widely used in the cleaning and medical industries, however, there are several concerns regarding the release of silver pollutants into the environment. Presented here are two engineered bacterial biosensors for the detection and quantification of silver. The biosensors contain a silver resistance operon and a GFP gene that is strictly regulated through silver activated regulatory regions that control expression of thesiloperons. The two biosensors are responsive to a wide range of silver ion concentrations, and a correlation between silver and GFP signal is seen at select concentration ranges. The biosensors were shown to detect silver ions released from silver nanoparticles, and have the potential to become a method for monitoring ion release rates of different nanoparticles. Interestingly, the close homology of the silver resistance and copper resistance genes allowed for the biosensor to also be responsive to copper ions, implying that copper ions activate silver resistance. Further development of this biosensor could lead to commercial applications for environmental monitoring.ImportanceIonic silver is known to have many harmful environmental effects. Silver pollutants have been found in various environmental settings such as natural waterways and tailings from mining operations, raising concern. In addition, persistent exposure to silver in medical and environmental settings has led to the development of silver resistant bacteria, many of which are also resistant to a wide range of antibiotics. Some of these have the potential to develop into human pathogens. It then becomes important to have standardized methods for detecting and monitoring silver concentrations in various environments so that appropriate measures can be taken to prevent further silver ion release. This research shows that bacterial biosensors engineered to detect and quantify silver ions can be developed as effective alternatives to traditional analytical techniques. Further development of such biosensors could result in a commercial system for short and long term environmental monitoring, which is important as products containing silver and other heavy metals become increasingly popular.

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Studies of the antimicrobial ability and silver ions migration from silver nitrate-incorporated electrospun nylon nanofibers

Food Packaging and Shelf Life ◽

10.1016/j.fpsl.2018.03.003 ◽

2018 ◽

Vol 16 ◽

pp. 129-137 ◽

Cited By ~ 9

Author(s):

Tien-Hsin Cheng ◽

Shih-Bin Lin ◽

Li-Chen Chen ◽

Hui-Huang Chen

Keyword(s):

Silver Nitrate ◽

Silver Ions

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The Mode of Action of Silver and Silver Halides Nanoparticles against Saccharomyces cerevisiae Cells

Journal of Nanoparticles ◽

10.1155/2014/568635 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 4

Author(s):

A. A. Kudrinskiy ◽

A. Yu. Ivanov ◽

E. V. Kulakovskaya ◽

A. I. Klimov ◽

P. M. Zherebin ◽

...

Keyword(s):

Saccharomyces Cerevisiae ◽

Silver Nitrate ◽

Silver Ions ◽

Tween 80 ◽

Cell Loss ◽

Yeast Cells ◽

Silver Halides ◽

Silver Nps ◽

Sodium Borohydride Reduction ◽

Synthesized Materials

Silver and silver halides nanoparticles (NPs) (Ag, AgCl, AgBr, and AgI) capped with two different stabilizers (sodium citrate and nonionic surfactant Tween 80) were obtained via sodium borohydride reduction of silver nitrate in an aqueous solution. The effect of the biocidal action of as-prepared synthesized materials against yeast cells Saccharomyces cerevisiae was compared to the effect produced by silver nitrate and studied through the measurement of cell loss and kinetics of K+ efflux from the cells depending on concentration of silver. The results clearly indicate that the silver ions either remained in the dispersion of silver NPs and silver halides NPs after their synthesis or were generated afterwards by dissolving silver and silver halides particles playing a major part in the cytotoxic activity of NPs against yeast cells. It was also supposed that this activity most likely does not relate to the damage of cell membrane.

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Effect of cobalt and silver ions and naphthaleneacetic acid on fruit retention in mango (Mangifera indica L.)

Australian Journal of Experimental Agriculture ◽

10.1071/ea9900433 ◽

1990 ◽

Vol 30 (3) ◽

pp. 433 ◽

Cited By ~ 2

Author(s):

SSM Naqvi ◽

SM Alam ◽

S Mumtaz

Keyword(s):

Silver Nitrate ◽

Mangifera Indica ◽

Silver Ions ◽

Cobalt Nitrate ◽

Naphthaleneacetic Acid ◽

Whole Tree

The effect of aqueous spray of cobalt nitrate, silver nitrate or 1-naphthaleneacetic acid (NAA) on fruit retention in mango (Mangifera indica L.) was investigated at Tando Jam, Pakistan. The chemicals were applied to immature fruits at pea size (5-6 mm) and again 2 weeks later when the fruitlets had developed to marble size (10-15 mm). Three cultivars, Sindhri, Langra (3 seasons) and Dasehari (4 seasons), were tested and it was observed that all concentrations of the chemicals significantly (P<0.05) increased fruit retention. In Sindhri, cobalt nitrate, silver nitrate and NAA treatments increased yields by 106-165%, 89-146% and 94-115%, respectively, and in Langra by 100-135%, 98-138% and 95-118%. Whole tree sprays of cv. Dasehari with Co(NO3)2 at 100 mg/L, AgNO3 at 100 mg/L, and NAA at 20 mg/L yielded 129%, 66% and 54% more fruit than the control.

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