Silver Nanoparticle Formation-Based Colorimetric Determination of Reducing Sugars in Food Extracts via Tollens’ Reagent

Durmazel, Selen; Üzer, Ayşem; Erbil, Buse; Sayın, Buse; Apak, Reşat

doi:10.1021/acsomega.9b00761

Cited by 31 publications

(19 citation statements)

References 41 publications

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“…The precursor (AgNO 3 ) concentration in each sample was 1 mM, pH 9.5. The reducing sugars glucose and fructose naturally occurring in honey were the reducing factor, and proteins were the capping factor [ 19 ]. An alkaline environment is necessary for AgNP synthesis; a high pH value facilitates the opening of the glucose ring by splitting the α-proton from the oxygen ring, and metal ions oxidize glucose to gluconic acid.…”

Section: Resultsmentioning

confidence: 99%

Biodirected Synthesis of Silver Nanoparticles Using Aqueous Honey Solutions and Evaluation of Their Antifungal Activity against Pathogenic Candida Spp.

Czernel

Bloch

Matwijczuk

et al. 2021

IJMS

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Silver nanoparticles (AgNPs) were synthesized using aqueous honey solutions with a concentration of 2%, 10%, and 20%—AgNPs-H2, AgNPs-H10, and AgNPs-H20. The reaction was conducted at 35 °C and 70 °C. Additionally, nanoparticles obtained with the citrate method (AgNPs-C), while amphotericin B (AmB) and fluconazole were used as controls. The presence and physicochemical properties of AgNPs was affirmed by analyzing the sample with ultraviolet–visible (UV–Vis) and fluorescence spectroscopy, scanning electron microscopy (SEM), and dynamic light scattering (DLS). The 20% honey solution caused an inhibition of the synthesis of nanoparticles at 35 °C. The antifungal activity of the AgNPs was evaluated using opportunistic human fungal pathogens Candida albicans and Candida parapsilosis. The antifungal effect was determined by the minimum inhibitory concentration (MIC) and disc diffusion assay. The highest activity in the MIC tests was observed in the AgNPs-H2 variant. AgNPs-H10 and AgNPs-H20 showed no activity or even stimulated fungal growth. The results of the Kirby–Bauer disc diffusion susceptibility test for C. parapsilosis strains indicated stronger antifungal activity of AgNPs-H than fluconazole. The study demonstrated that the antifungal activity of AgNPs is closely related to the concentration of honey used for the synthesis thereof.

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Section: Resultsmentioning

confidence: 99%

Biodirected Synthesis of Silver Nanoparticles Using Aqueous Honey Solutions and Evaluation of Their Antifungal Activity against Pathogenic Candida Spp.

Czernel

Bloch

Matwijczuk

et al. 2021

IJMS

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“…Several routes have been devised in green nanotechnology, including biological methods [18], ultrasound (US) energy [22][23][24], microwave irradiation [25][26][27][28] or the use of Tollens' reagent [29,30] for the synthesis of valuable NPs of controlled shapes and sizes. However, nanoparticles are naturally unstable and tend to aggregate due to the onset of strong van der Waals forces [31].…”

Section: Introductionmentioning

confidence: 99%

Sugar-Mediated Green Synthesis of Silver Selenide Semiconductor Nanocrystals under Ultrasound Irradiation

et al. 2020

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Silver selenide (Ag2Se) is a promising nanomaterial due to its outstanding optoelectronic properties and countless bio-applications. To the best of our knowledge, we report, for the first time, a simple and easy method for the ultrasound-assisted synthesis of Ag2Se nanoparticles (NPs) by mixing aqueous solutions of silver nitrate (AgNO3) and selenous acid (H2SeO3) that act as Ag and Se sources, respectively, in the presence of dissolved fructose and starch that act as reducing and stabilizing agents, respectively. The concentrations of mono- and polysaccharides were screened to determine their effect on the size, shape and colloidal stability of the as-synthesized Ag2Se NPs which, in turn, impact the optical properties of these NPs. The morphology of the as-synthesized Ag2Se NPs was characterized by transmission electron microscopy (TEM) and both α- and β-phases of Ag2Se were determined by X-ray diffraction (XRD). The optical properties of Ag2Se were studied using UV–Vis spectroscopy and its elemental composition was determined non-destructively using scanning electron microscopy–energy-dispersive spectroscopy (SEM–EDS). The biological activity of the Ag2Se NPs was assessed using cytotoxic and bactericidal approaches. Our findings pave the way to the cost-effective, fast and scalable production of valuable Ag2Se NPs that may be utilized in numerous fields.

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“…Ammonia solution dissolves silver chloride to form diammineargentate complex ion as indicated by the following reaction: [22] AgClðsÞ þ 2NH 3 ðaqÞ $ ½AgðNH 3 Þ 2 � þ ðaqÞ þ Cl À ðaqÞ The stock solution of diammineargentate complex ion was prepared by dissolving 0.128 g of AgCl in 50 mL of ammonia solution 1 M. For the synthesis of AgNPs, a fresh solution of diammineargentate complex ion was prepared from the stock solution by dilution using distilled water to a final concentration of ammonia 0.01 M. At this concentration of ammonia, the silver ion is present as [Ag(NH 3 ) 2 ] + . [24] This [Ag(NH 3 ) 2 ] + is then used as a source of silver in the synthesis of AgNPs with p-hydroxybenzoic acid as a reducing agent.…”

Section: Preparation Of Silver Ionmentioning

confidence: 99%

Waste from Argentometric Determination of Chloride as a Source of Silver in the Synthesis of p‐Hydroxybenzoic Acid Capped Silver Nanoparticles

et al. 2021

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This paper describes the utilization of waste from the argentometric determination of chloride in a chemistry teaching laboratory as a source of silver for the synthesis of phydroxybenzoic acid capped silver nanoparticles (AgNPs). All white and red-brick precipitates in the waste were first separated from the liquid and converted to silver chloride precipitate by washing the precipitates using hydrochloride acid 0.1 M. The silver chloride precipitate was then converted to diammineargentate complex ion by dissolving it into an ammonia solution. The conversion was successfully conducted by using 50 moles of ammonia for every mole of silver chloride. The formation of AgNPs was optimum by applying diammineargentate complex ion and p-hydroxybenzoic acid solutions at a molar ratio of 1 : 10. The formed AgNPs showed a yellow color and absorption peak at around 420 nm with an average particle size of 26.4 nm. The as-synthesized AgNPs were stable at least 16 weeks of storage, indicating that p-hydroxybenzoic acid did not only act as a reducing agent but also play a role as a capping agent.

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Silver Nanoparticle Formation-Based Colorimetric Determination of Reducing Sugars in Food Extracts via Tollens’ Reagent

Cited by 31 publications

References 41 publications

Biodirected Synthesis of Silver Nanoparticles Using Aqueous Honey Solutions and Evaluation of Their Antifungal Activity against Pathogenic Candida Spp.

Biodirected Synthesis of Silver Nanoparticles Using Aqueous Honey Solutions and Evaluation of Their Antifungal Activity against Pathogenic Candida Spp.

Sugar-Mediated Green Synthesis of Silver Selenide Semiconductor Nanocrystals under Ultrasound Irradiation

Waste from Argentometric Determination of Chloride as a Source of Silver in the Synthesis of p‐Hydroxybenzoic Acid Capped Silver Nanoparticles

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