Fluorescence properties of Ag nanoparticles in water, methanol and hexane

Siwach, Om Parkash; Sen, Parongama

doi:10.1016/j.jlumin.2008.07.010

Cited by 20 publications

(14 citation statements)

References 27 publications

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“…The λ ex / λ em wavelength for LBPC23-AgCs was found to be 214 nm, 338 nm (I) and 270 nm, 538 nm (II), respectively. Figure 6A shows the excitation (214 nm) and emission (338 nm) bands reflecting the effect of organics core, fluorescence of aromatic AA such as tryptophan, tyrosine, and phenylalanine (Ghisaidoobe and Chung, 2014), and Figure 6B shows the excitation (270 nm) and emission (538 nm) bands characteristic for silver light interaction to the core of nanocomposites (Siwach and Sen, 2009). Taking into consideration that all of the results led to the confirmation of the natural presence of an organic surface generated by the bacteria isolated from the whey-protein/peptide components into or onto the silver nanoparticles core that are referred to as biocolloids.…”

Section: Lbpc-agnc Biosilver Composite Characterizationmentioning

confidence: 99%

Use of Lactobacillus paracasei isolated from whey for silver nanocomposite synthesis: Antiradical and antimicrobial properties against selected pathogens

Railean-Plugaru

Pomastowski

Buszewski

2021

Journal of Dairy Science

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The present research emphasizes the use of safe, inexpensive, and available whey using Lactobacillus paracasei as a source in silver nanocomposite synthesis as an alternative bioactive agent for dairy and biomedical applications. Through the multiinstrumental approach used in this study based on spectroscopic and microscopic methods as well as spectrometric techniques, the characterization and evaluation of silver composites and their antimicrobial and antiradical properties were enabled. Synthesized silver nanocomposites have been found in form of nanocrystals, naturally coated by an organic surface with high antimicrobial and antiradical properties. Furthermore, this work also presents an innovative approach regarding the organic surface (naturally secreted by the bacteria isolated from whey) of the core of nanoparticles, which has already been explored and therefore is starting to supplement the scientific approach concerning biologically synthesized nanoparticles. This work also presents a general frame on the resistance subject by performing the trial interaction of commercially available antibiotics (kanamycin and ampicillin) with new bioactive compounds that can create novel knowledge on complementing their action. Moreover, synthesized silver nanocomposites have shown great antioxidant and antimicrobial effects against various foodborne pathogens from dairy products and drug resistance pathogens found in the medical area to rank on the top of mortality rate.

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Section: Lbpc-agnc Biosilver Composite Characterizationmentioning

confidence: 99%

Use of Lactobacillus paracasei isolated from whey for silver nanocomposite synthesis: Antiradical and antimicrobial properties against selected pathogens

Railean-Plugaru

Pomastowski

Buszewski

2021

Journal of Dairy Science

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“…Among such materials, silver nanoparticles have been intensively studied because of their intriguing optical, electronic, mechanical and bactericidal properties [ 2 ]. Several techniques have been employed for the synthesis of noble metal nanoparticles, such as gas evaporation, arc plasma, sputtering, electrochemical methods, laser ablation [ 3 ], etc. This communication describes the synthesis of silver nanoparticles by chemical reduction of silver ions by NaBH 4 [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

One-Pot Silver Nanoring Synthesis

et al. 2009

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Silver colloidal nanorings have been synthesized by reducing silver ions with NaBH4 in trisodium citrate buffers. pH increase, by addition of NaOH, was used to speed up reduction reaction. The UV–vis absorption spectra of resulting silver nanorings showed two peaks accounting for transverse and longitudinal surface plasmon resonance, at ≈400 nm, and between 600 and 700 nm, respectively. The shapes of these silver nanoparticles (nanorings) depended on AgNO3/NaBH4 ratio, pH and reaction temperature. Particles were analysed by transmission electron microscopy, scanning electron microscopy and X-ray diffraction. A reaction pathway is proposed to explain silver nanoring formation.

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“…It should be mentioned that the fluorescence of metal clusters and thin films is well established based on Mooradian's observation of photoluminescence from bulk copper and gold [24]. Also several reports are available related to the fluorescence of silver nanoclusters [25,26].Glucose, a simple sugar (monosaccharide), is an important carbohydrate in biology. Cells use it as a source of energy and a metabolic intermediate and its lack or excess can produce detrimental influence on cellular functions.…”

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confidence: 99%

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confidence: 99%

A nanosensor for determination of glucose based on silver nanoparticles as fluorescence probes

et al. 2015

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afforded by nanoscale technologies are expected to have substantial impacts on almost all industries and areas of society (e.g., medicine, plastics, energy, electronics, and aerospace) [1][2][3][4][5]. The recent advancement of bioanalytical techniques involving the development of highly sensitive or selective analytical methods based on nanoscale materials/molecules have progressed with remarkable success. In this regard, silver nanoparticles (AgNPs) have received significant attention in constructing analytical and bioanalytical sensors. This relevance arises from their unusual optical, electronic, and chemical properties [6][7][8]. They have a high surface area, very small size (<20 nm) and high dispersion ability, spectrally selective coating [9, 10], surface-enhanced Raman scattering [11,12], and antibacterial activity [13]. Moreover, AgNPs exhibit optical properties which could not be observed either in molecular or in bulk metallic form [14][15][16][17].Fluorescence spectroscopy as a sensitive, simple, diverse, and nondestructive method can provide real time, in situ, and dynamic analytical information [18]. However, utilizing nanoparticles in fluorescence analysis has provided significant improvement in this area [19][20][21][22][23]. It should be mentioned that the fluorescence of metal clusters and thin films is well established based on Mooradian's observation of photoluminescence from bulk copper and gold [24]. Also several reports are available related to the fluorescence of silver nanoclusters [25,26].Glucose, a simple sugar (monosaccharide), is an important carbohydrate in biology. Cells use it as a source of energy and a metabolic intermediate and its lack or excess can produce detrimental influence on cellular functions. The glucose level in blood is considered as a clinical indicator for diabetes. Therefore, the monitoring of glucose level in blood with faster and more accurate methods is in great demand and a great deal of effort has been focused Abstract A nanosensor was designed for the enzymatic determination of glucose based on the fluorescence enhancement of silver nanoparticles (AgNPs). This enhancement is the result of the glucose oxidase-catalyzed oxidation of glucose. Silver nanoparticles were prepared through a chemical reduction by using trisodium citrate as the reducing agent and were characterized with UV-visible spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscopy. The experimental results showed that the increase of the AgNP fluorescence was linearly proportional to the concentration of glucose within its concentration ranges of 2.50 × 10 −5 -7.50 × 10 −3 M and 7.50 × 10 −3 -7.50 × 10 −2 M with a detection limit of 5.53 × 10 −7 M under the optimized experimental conditions. To evaluate the applicability of the nanobiosensor, determination of glucose in real samples was performed according to the developed procedure.

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Fluorescence properties of Ag nanoparticles in water, methanol and hexane

Cited by 20 publications

References 27 publications

Use of Lactobacillus paracasei isolated from whey for silver nanocomposite synthesis: Antiradical and antimicrobial properties against selected pathogens

Use of Lactobacillus paracasei isolated from whey for silver nanocomposite synthesis: Antiradical and antimicrobial properties against selected pathogens

One-Pot Silver Nanoring Synthesis

A nanosensor for determination of glucose based on silver nanoparticles as fluorescence probes

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