Relation between excitation dependent luminescence and particle size distributions for the selenium nanoparticles in κ-carrageenan shell

Lesnichaya, M. V.; Shendrik, R. Yu.; Сухов, Б. Г.

doi:10.1016/j.jlumin.2019.03.056

Cited by 20 publications

(11 citation statements)

References 50 publications

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“…The differences in PL emission may be ascribed to the diversity of the capping material surrounding these NPs, being less complex (mixture of ascorbic acid and polyvinyl alcohol) than the OM herein present on our SeNPs. Thus, the narrow PL window of SeNPs within L-cys SeNPs_1:3, Bio SeNP extract_LB and L-cys SeNPs_1:3 + OM_LB can be traced back to both (i) their small average diameters and (ii) their relative monodispersity in suspension ( Figure 3A-C, Table 1), although specific "size effects" [76] appeared to be partially responsible for the diverse PL contributions observed.…”

Section: Photoluminescence Properties and Lifetime Measurements Of Bimentioning

confidence: 97%

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Tunable photoluminescence properties of selenium nanoparticles: biogenic versus chemogenic synthesis

et al. 2020

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AbstractVarious technological and biomedical applications rely on the ability of materials to emit light (photoluminescence [PL]), and, among them, metal nanoparticles (NPs) and semi-conductor Quantum Dots (QDs) represent ideal candidates as sensing probes and imaging tools, portraying better PL features than conventional organic dyes. However, the knowledge of PL behavior of semiconductor NPs – i.e., selenium; SeNPs – is still in its infancy, especially for those synthesized by microorganisms. Considering the essential role played by biogenic SeNPs as antimicrobial, anticancer, and antioxidant agents, or food supplements, their PL properties must be explored to take full advantage of them as eco-friendly and versatile tools. Here, PL features of SeNPs produced by the Se-tolerant Stenotrophomonas maltophilia SeITE02 strain, compared with chemogenic ones, are investigated, highlighting the PL dependency on the NP size. Indeed, PL emission shifted from indigo-blue (emission wavelength λem 400–450 nm) to green-yellow (λem 480–570 nm) and orange-red (λem 580–700 nm) for small (ca. 50 nm) and big (ca. 100 nm) SeNPs respectively, revealing the versatility of an environmental bacterial isolate to synthesize diverse PL probes. Besides, biogenic SeNPs show PL lifetime comparable to those of the most used fluorophores, supporting their potential application as markers for (bio)imaging.

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Section: Photoluminescence Properties and Lifetime Measurements Of Bimentioning

confidence: 97%

“…Since PL of SeNPs has just recently gained scientific and applicative interest, the physical-chemical mechanisms responsible for this phenomenon, as well as its dependency on size, polydispersity, and the surrounding capping agents [16,76], are still scarcely investigated.…”

Section: Photoluminescence Properties and Lifetime Measurements Of Bimentioning

confidence: 99%

Tunable photoluminescence properties of selenium nanoparticles: biogenic versus chemogenic synthesis

et al. 2020

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“…Synthesis was carried out in accordance with the previously described technique [28] with minor experimental changes that allowed to obtain a wider range of nanocomposites with different content of Se 0 NPs, as well as to overcome diffusion difficulties in the migration of selenium atoms in the process of nucleation and growth of nanoparticles due to the aggregation and gel formation of κ‐CG macromolecules in the presence of potassium ions. Briefly, in a three‐necked flask equipped with a reflux condenser and a thermometer, 1 g NaOH and 0.5 ml N 2 H 4 ·H 2 O were placed under constant stirring, then the temperature of this reaction medium was brought to 70°C and 0.98 g of elemental bulk‐selenium was added under an argon atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…The formation of selenium nanoparticles is the result of a multistage process of nucleation of a new phase, one stage of which is the sequential coalescence of selenium atoms formed as a result of oxidation by molecular oxygen of Se 2− ions with further stabilisation of nanoparticles by κ-CG macromolecules [28,34]. According to the data of TEM, nanocomposites Se 0 /κ-CG are produced in the form of spherical nanoparticles dispersed in the polysaccharide matrix of κ-CG ( Fig.…”

Section: Synthesis and Characterisation Of Nanocompositesmentioning

confidence: 99%

Synthesis and comparative assessment of antiradical activity, toxicity, and biodistribution of κ‐carrageenan‐capped selenium nanoparticles of different size: in vivo and in vitro study

Lesnichaya

Shendrik

Титов

et al. 2020

IET nanobiotechnol.

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In the present study, water-soluble hybrid selenium-containing nanocomposites have been synthesised via soft oxidation of selenide-anions, preliminarily generated from elemental bulk-selenium in the base-reduction system 'N 2 H 4-NaOH'. The nanocomposites obtained consist of Se 0 NPs (4.6-24.5 nm) stabilised by κ-carrageenan biocompatible polysaccharide. The structure of these composite nanomaterials has been proven using complementary physical-chemical methods: X-ray diffraction analysis, transmission electron microscopy, optical spectroscopy, and dynamic light scattering. Optical ranges of 'emission/ excitation' of aqueous solutions of nanocomposites with Se 0 NPs of different sizes are established and the most important parameters of their luminescence are determined. For the obtained nanocomposites, the expressed antiradical activity against free radicals 2,2-diphenyl-1-picrylhydrazyl and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid has been found, the value of which depends on the size of selenium nanoparticles. It is experimentally revealed that all obtained nanocomposites are low toxic (LD 50 >2000 mg/kg). It is also found that small selenium nanoparticles (6.8 nm), in contrast to larger nanoparticles (24.5 nm), are accumulated in organisms to significantly increase the level of selenium in the liver, kidneys, and brain (in lesser amounts) of rats.

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“…Выход составил 94%. Количественное содержание селена в полученном образце было 2.0% по данным рентгеновского спектрального энергодисперсионного микроанализа (РСЭДМА) [18]. Для экспериментов использовали растворы НК, в которых содержание селена составляло 0.000625%.…”

Section: экспериментальная частьunclassified

Биологическая активность нанокомпозита селена, инкапсулированного в макромолекулы каррагинана, по отношению к возбудителю кольцевой гнили и растениям картофеля in vitro

Ножкина¹,

Perfileva²,

Граскова³

et al. 2019

Rossijskie nanotehnologii

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Изучено влияние нанокомпозита селена, инкапсулированного в матрицу каррагинана (НК Se/Кар), на бактерию, вызывающую кольцевую гниль картофеля Clavibacter michiganensis subsp. sepedonicus (Cms), и растения картофеля in vitro. По данным электронной микроскопии НК Se/Кар состоит из сферических наночастиц селена широкого диапазона размерности, образующих агрегаты. Обнаружено, что нанокомпозит не обладает бактериостатической и антибиопленочной активностью в отношении бактерий Cms. Эксперименты, проведенные на растениях, показали стимулирующее влияние НК Se/Кар на биометрические показатели и снижение негативного эффекта заражения картофеля Cms. Установлено незначительное накопление селена в тканях картофеля после его обработки НК Se/Кар (0.01–0.03% воздушно-сухой массы). Полученные результаты позволяют рассматривать НК Se/Кар как агент для стимуляции развития сельскохозяйственных растений.

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Relation between excitation dependent luminescence and particle size distributions for the selenium nanoparticles in κ-carrageenan shell

Cited by 20 publications

References 50 publications

Tunable photoluminescence properties of selenium nanoparticles: biogenic versus chemogenic synthesis

Tunable photoluminescence properties of selenium nanoparticles: biogenic versus chemogenic synthesis

Synthesis and comparative assessment of antiradical activity, toxicity, and biodistribution of κ‐carrageenan‐capped selenium nanoparticles of different size: in vivo and in vitro study

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