15 research outputs found
Theranostic Applications of Au-Ag Nanocages and Nanocomposites
We report two novel biomedical applications of Au/Ag alloy nanoparticles called nanocages. In the first
case, composite nanoparticles consisting of a nanocage core and a mesoporous silica shell doped with a photodynamic
sensitizer Yb-2,4-hematoporphyrin were fabricated, characterized, and tested in vitro and ex vivo.
In the second part of the study, Ag nanocubes and Au/Ag nanocages were applied to a multiplexed dot
immunoassay. The assay principle is based on the staining of analyte drops on a nitrocellulose membrane
strip by using multicolor nanoparticles conjugated with biospecific probing molecules.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3493
Synthesis and Study of PNIPAM Nanogels Incorporated with Colloidal Silver
Composite nanoparticles consisting of polymer gels with incorporated silver nanoparticles have been synthesized. The synthesis comprises two main stages. Initially, monodisperse hydrogel particles with a controlled diameter of approximately 500 nm are obtained by N-isopropylacrylamide polymerization. Then, silver ions are reduced on the surface of the polymer network. Variations in the concentration ratio between reductants and silver nitrate make it possible to produce silver nanoparticles with sizes in a range of 10-30 nm and different packing densities on the gel particle surface. The resultant nanocomposites have been studied by transmission electron microscopy, spectrophotometry, and dynamic light scattering. Depending on the size and packing density of the silver nanoparticles on the polymer particle surface, the plasmon resonance of the nanocomposites varies in a range of 420-750 nm, which determines variations in the color of the colloid from yellow, orange, and red to blue and blue-green. After the inclusion of silver nanoparticles, nanogels of poly(N-isopropylacrylamide) retain their capability for thermosensitive phase transition with a lower critical mixing temperature of 31 Β°C.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3509
Morphokinetics of mesenterial lymphatic node cell populations in exposure of gold nanoparticles within experimental work
The research goal is to investigate the influence of gold nanoparticles with different size (1-3 nm, 15 nm and 50 nm) on the morphokinetics of mesenterial lymphatic node cell populations of healthy laboratory animals. Experiment included 24 white rats. The investigation was conducted in 4 groups of animals. The animals were administered the gold nanoparticles orally for 15 days. It was established that the oral administration of gold nanoparticles caused the changes of morphokinetics of mesenterial lymphatic node cell populations. The morphological alterations in the mesenterial lymphatic nodes assisted in activation of migration processes, the proliferation and differentiation. The immu-nomodulatory action of gold nanoparticles was prove
Mesoporous Silica and Composite Nanostructures for Theranostics
We discus methods for fabrication of silica and composite nanoparticles, which can be used in various biomedical applications. The most promising types of such nanostructures are hollow silica nanosheres, sil-ica coated plasmon-resonant nanoparticles (gold nanorods and gold-silver nanocages) and nanorattles. Mesoporous silica shell can be doped by desirable targeting molecules. Here we present the results of for-mation of nanocomposites composed of gold nanorods and double-layer silica shell. The secondary mesopo-rous silica shell is doped with a photosensitizer (hematoporphyrine in our case). We demonstate some of promising theranostics applications of these nanocomposites for bioimaging and in vivo therapy of tumors.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3548
Mesoporous Silica and Composite Nanostructures for Theranostics
We discus methods for fabrication of silica and composite nanoparticles, which can be used in various biomedical applications. The most promising types of such nanostructures are hollow silica nanosheres, sil-ica coated plasmon-resonant nanoparticles (gold nanorods and gold-silver nanocages) and nanorattles. Mesoporous silica shell can be doped by desirable targeting molecules. Here we present the results of for-mation of nanocomposites composed of gold nanorods and double-layer silica shell. The secondary mesopo-rous silica shell is doped with a photosensitizer (hematoporphyrine in our case). We demonstate some of promising theranostics applications of these nanocomposites for bioimaging and in vivo therapy of tumors.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3548
The assessment of molecular markers of cell interaction and lipid peroxidation in rats with alloxan diabetes and trans- planted liver cancer after intravenous injection of gold nanorods
Π¦Π΅Π»Ρ: ΠΎΡΠ΅Π½ΠΈΡΡ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ ΠΎΠ΄Π½ΠΎΠΊΡΠ°ΡΠ½ΠΎΠ³ΠΎ Π²Π½ΡΡΡΠΈΠ²Π΅Π½Π½ΠΎΠ³ΠΎ Π²Π²Π΅Π΄Π΅Π½ΠΈΡ ΠΏΠΎΠΊΡΡΡΡΡ
ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π³Π»ΠΈΠΊΠΎΠ»Π΅ΠΌ Π·ΠΎΠ»ΠΎΡΡΡ
Π½Π°Π½ΠΎΡΡΠ΅ΡΠΆΠ½Π΅ΠΉ Π½Π° ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΡΠ΅ ΠΌΠ°ΡΠΊΠ΅ΡΡ ΠΌΠ΅ΠΆΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠ³ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΈ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ ΠΏΠ΅ΡΠ΅ΠΊΠΈΡΠ½ΠΎΠ³ΠΎ ΠΎΠΊΠΈΡΠ»Π΅Π½ΠΈΡ Π² ΡΡΠ²ΠΎΡΠΎΡΠΊΠ΅ ΠΊΡΠΎΠ²ΠΈ ΡΠ΅ΡΡΡΠ΅Ρ
Π³ΡΡΠΏΠΏ ΠΊΡΡΡ: ΠΈΠ½ΡΠ°ΠΊΡΠ½ΡΡ
, Ρ Π°Π»Π»ΠΎΠΊΡΠ°Π½ΠΎΠ²ΡΠΌ Π΄ΠΈΠ°Π±Π΅ΡΠΎΠΌ, Ρ ΠΏΠ΅ΡΠ΅Π²ΠΈΡΡΠΌ ΡΠ°ΠΊΠΎΠΌ ΠΏΠ΅ΡΠ΅Π½ΠΈ; Ρ ΠΏΠ΅ΡΠ΅Π²ΠΈΡΡΠΌ ΡΠ°ΠΊΠΎΠΌ ΠΏΠ΅ΡΠ΅Π½ΠΈ Π½Π° ΡΠΎΠ½Π΅ Π°Π»Π»ΠΎΠΊΡΠ°Π½ΠΎΠ²ΠΎΠ³ΠΎ Π΄ΠΈΠ°Π±Π΅ΡΠ°. ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. ΠΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΏΠ΅ΡΠ΅ΠΊΠΈΡΠ½ΠΎΠ³ΠΎ ΠΎΠΊΠΈΡΠ»Π΅Π½ΠΈΡ Π»ΠΈΠΏΠΈΠ΄ΠΎΠ² ΠΎΡΠ΅Π½ΠΈΠ²Π°Π»Π°ΡΡ ΠΏΠΎ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΡΠΌ Π³ΠΈΠ΄ΡΠΎΠΏΠ΅ΡΠ΅ΠΊΠΈΡΠ΅ΠΉ Π»ΠΈΠΏΠΈΠ΄ΠΎΠ², ΠΌΠ°Π»ΠΎΠ½ΠΎΠ²ΠΎΠ³ΠΎ Π΄ΠΈΠ°Π»ΡΠ΄Π΅Π³ΠΈΠ΄Π° ΠΈ ΠΌΠΎΠ»Π΅ΠΊΡΠ» ΡΡΠ΅Π΄Π½Π΅ΠΉ ΠΌΠ°ΡΡΡ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΎΠ±ΡΠ΅ΠΏΡΠΈΠ½ΡΡΡΡ
ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΎΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ², ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΡΡ
ΠΌΠ°ΡΠΊΠ΅ΡΠΎΠ² β ΡΠ°ΠΊΡΠΎΡΠ° Π½Π΅ΠΊΡΠΎΠ·Π° ΠΎΠΏΡΡ
ΠΎΠ»ΠΈ TNF-a, ΠΈΠ½ΡΡΠ»ΠΈΠ½ΠΎΠΏΠΎΠ΄ΠΎΠ±Π½ΠΎΠ³ΠΎ ΡΠ°ΠΊΡΠΎΡΠ° ΡΠΎΡΡΠ° IGF-1, Π²Π°ΡΠΊΡΠ»ΠΎΡΠ½-Π΄ΠΎΡΠ΅Π»ΠΈΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ°ΠΊΡΠΎΡΠ° ΡΠΎΡΡΠ° VEGF-C ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈΡΡ Π² ΡΡΠ²ΠΎΡΠΎΡΠΊΠ΅ ΠΊΡΠΎΠ²ΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΈΠΌΠΌΡΠ½ΠΎΡΠ΅ΡΠΌΠ΅Π½ΡΠ½ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π°. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΡΡΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΏΡΠΈ ΠΎΠ΄Π½ΠΎΠΊΡΠ°ΡΠ½ΠΎΠΌ Π²Π½ΡΡΡΠΈΠ²Π΅Π½Π½ΠΎΠΌ Π²Π²Π΅Π΄Π΅Π½ΠΈΠΈ Π·ΠΎΠ»ΠΎΡΡΡ
Π½Π°Π½ΠΎΡΡΠ΅ΡΠΆΠ½Π΅ΠΉ Π½Π΅ ΠΏΡΠΎΠΈΡΡ
ΠΎΠ΄ΠΈΡ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π° ΠΌΠ°ΡΠΊΠ΅ΡΠΎΠ² ΠΌΠ΅ΠΆΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠ³ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΈ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»Π΅ΠΉ ΠΏΠ΅ΡΠ΅ΠΊΠΈΡΠ½ΠΎΠ³ΠΎ ΠΎΠΊΠΈΡΠ»Π΅Π½ΠΈΡ Π»ΠΈΠΏΠΈΠ΄ΠΎΠ². Π² ΠΏΠ΅ΡΠΈΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΊΡΠΎΠ²ΠΈ. ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΠΎΠ²Π°ΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΠΎΠΊΡΡΡΡΡ
ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π³Π»ΠΈΠΊΠΎΠ»Π΅ΠΌ Π·ΠΎΠ»ΠΎΡΡΡ
Π½Π°Π½ΠΎΡΡΠ΅ΡΠΆΠ½Π΅ΠΉ Π² ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠΉ ΠΎΠ½ΠΊΠΎΠ»ΠΎΠ³ΠΈΠΈ.</p
Analysis of accumulation and biodistribution of gold nanoparticles in mesenteric lymph nodes by oral administration
The aim of the article is to conduct analysis of accumulation and biodistribution of gold nanoparticles in the structural and functional areas of mesenteric lymph nodes of white rats. Particular attention is paid to the size and duration of oral administration. Material and Methods: Dark field microscopy with Leica DM 2500 microscope has been used to assess biodistribution of gold nanoparticle. The histochemical reaction of silver amplification with silver lactate by Danscher has been used to confirm gold nanoparticles identification. Results: It has been found that regardless of the duration of administration gold nanoparticles of 1-3 nm have not been detected by these methods in the lymph nodes. Gold nanoparticles of 15 and 50 nm have been found out in the form of clusters in the cytoplasm of macrophages and lymphocytes mainly in the mantle zone of lymphoid follicles and brain strands. Conclusion: It has been established that the gold nanoparticles of 15 and 50 nm has been detected in the form of clusters in the cytoplasm of macrophages and lymphocytes
Morphological changes in the organs of laboratory animals during the prolonged oral administration of gold nanoparticles
The purpose of the article is to assess the severity of the morphological changes in the internal organs of laboratory animals with prolonged oral administration of gold nanoparticles of different sizes. Material and methods: The experiment was carried out on 40 albino rats which were divided into 4 groups. Animals of the experimental group received oral gold nanoparticles by the appropriate scheme. Results: At comparing the morphological changes in the internal organs of laboratory animals it was established that the introduction of gold nanoparticles of different sizes leads to the same type of disturbances of morphological structure, the gold nanoparticles of 1-3 and 50 nm cause the most expressive changes. Conclusion: The most significant morphological modifications in the internal organs were caused by gold nanoparticles of 1-3 and 50 nm. It points out to the size-dependence of the effect of gold nanoparticles
Morphokinetics of mesenterial lymphatic node cell populations at exposure of gold nanoparticles in experiment
The influence of gold nanoparticles with different size (1-3 nm, 15 nm and 50 nm) on the morphokinetics of mesenterial lymphatic node cell populations of healthy laboratory animals was investigated. It was established that the oral administration of gold nanoparticles caused the changes of morphokinetics of mesenterial lymphatic node cell populations. The morphological reorganizations in the mesenterial lymphatic nodes testified about activation of migration processes, the proliferation and differentiation processes of immunocompetent cells, which assumes the presence of immunomodulating action of gold nanoparticles
Surface modification of orthodontic implants by nanocomposite coatings based on chitosan and metals
Purpose: to study the properties of nanostructured coatings in orthodontic implants. Material and methods. Low and average molecular mass chitosan, 3-amynopropil-3-methoxysylan and suspensions of 5 nm and 10 nm gold nano-spheres stabilized with natrium citrate were used for nanocomposed surfaces. 2mg/ml polyethylenamin water solution was used for making the underlayer before putting polyion coverage using Β«POLYION-1MΒ». The polyion covering dynamics was studied by polyquartz weighing method. Morphology of created layers was studied with atomic microscopy, elements were studied by secondary ion mass-spectrometry. Results. The best transmission among structures of chito-san/metals was showed by low molecular mass of chitosan and 8-1 Onm nanoparticles of metals. Analysis of roughness of surface shows that nanoparticles of gold make the most solid surface on 3-amynopropil-3-methoxysylan underlayer. Conclusion. The development of biocomparative materials in maxillofacial surgery is considered to be effective method of decreasing the risk of post-operative inflammatory complications by local antibacterial effect