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Wyszukujesz frazę "surface plasmon resonance" wg kryterium: Temat


Tytuł:
Surface Plasmon Resonance in the Development of TGF-β Activators for Cosmeceutical Use
Autorzy:
Rovero, Paolo
Latajka, Rafał
Errante, Fosca
Ledwoń, Patrycja
Real Fernández, Feliciana
Wydawca:
AIJR Publisher
Cytata wydawnicza:
P. Ledwoń, F. Errante, F. Real Fernández, P. Rovero, and R. Latajka, “Surface Plasmon Resonance in the Development of TGF-β 232Activators for Cosmeceutical Use”, Int. Ann. Sci., vol. 14, no. 1, pp. 1–9, May 2024
Opis:
Research on new compounds that can improve the skin's condition is no longer focused exclusively on drugs, but is also adequate for cosmeceuticals – cosmetic products with thoroughly tested and scientifically proven biological activity. One of the most important stimulators of collagen biosynthesis is the so-called Transforming Growth Factor-β (TGF-β). Measuring the activation of latent TGF-β and quantification of its efficacy using the Surface Plasmon Resonance (SPR) technique is a great alternative to the currently used Enzyme-linked Immunosorbent Assay (ELISA) method. In this article, the complex process of TGF-β activation and the methods of its quantification are described. SPR was investigated as a relevant method for the TGF-β activity detection. Optimization of measurement conditions is presented, comparing results of antibody immobilization efficacy in different buffers. Two types of antibodies were immobilized onto the SPR chip, and after choosing one of them the selectivity of capturing between active and inactive TGF-β was confirmed. SPR is discussed as a technique with great potential in cosmeceutical design, in comparison to currently applied quantification methods.
National Science Centre, Poland, grant no.2021/41/N/ST4/04020
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Application of dielectric layers in surface plasmon resonance sensors
Autorzy:
Kurlov, S.
Lebyedyeva, T.
Poperenko, L.
Shpylovyy, P.
Tematy:
surface plasmon resonance
sensor
modelling
anodization
sputtering
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:
https://bibliotekanauki.pl/articles/385090.pdf  Link otwiera się w nowym oknie
Opis:
Sensors based on surface plasmon resonance (SPR) are widespread in modern devices of biochemical application. As a rule, a technique of diagnostic is a measurement of angle dependence of the refraction index from incident angle of p-polarised monochromic light R( ) from the substrate at plasmon excitation supporting metal film contacted by enviro nment or layer under investigation. Potentialities of SPR sensors may be extended with the inclusion of additional dielectric films into the structure of SPR substrates.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity enhancement of a nanocomposite-based fiber optics sensor with platinum nanoparticles
Autorzy:
Vahed, Hamid
Ghazanfari, Elham
Tematy:
surface plasmon resonance
sensor
nanocomposite
platinum
sensitivity
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/174148.pdf  Link otwiera się w nowym oknie
Opis:
In this paper, sensitivity enhancement of a nanocomposite-based optical fiber sensor with platinum nanoparticles is investigated. This optical fiber sensor is based on the surface plasmon resonance in the nanocomposite layer coating the core of optical fiber. A comparison is carried out for sensitivity between an optical fiber sensor based surface plasmon resonance with platinum layer and the one with nanocomposite layer. The nanocomposite layer consists of platinum nanoparticles with varying volume fraction which is arrayed in a host dielectric material of InN or TiO2. We show that the sensitivity of the sensor with a nanocomposite layer containing platinum nanoparticles is bigger than the sensitivity of the sensor with a platinum layer for all the values of refractive index of sample media. Also, the effect of the thickness of the nanocomposite layer and the volume fraction of platinum nanoparticles on the spectrum of the transmitted power has been investigated.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of glycophorin A with lectins as measured by surface plasmon resonance (SPR).
Autorzy:
Krotkiewska, Bożena
Pasek, Marta
Krotkiewski, Hubert
Tematy:
glycoproteins
surface plasmon resonance
lectins
human glycophorin
biosensor
Pokaż więcej
Wydawca:
Polskie Towarzystwo Biochemiczne
Powiązania:
https://bibliotekanauki.pl/articles/1043786.pdf  Link otwiera się w nowym oknie
Opis:
Glycophorin A (GPA), the major sialoglycoprotein of the human erythrocyte membrane, was isolated from erythrocytes of healthy individuals of blood groups A, B and O using phenol-water extraction of erythrocyte membranes. Interaction of individual GPA samples with three lectins (Psathyrella velutina lectin, PVL; Triticum vulgaris lectin, WGA and Sambucus nigra I agglutinin SNA-I) was analyzed using a BIAcoreTM biosensor equipped with a surface plasmon resonance (SPR) detector. The experiments showed no substantial differences in the interaction between native and desialylated GPA samples originating from erythrocytes of either blood group and each of the lectins. Desialylated samples reacted weaker than the native ones with all three lectins. PVL reacted about 50-fold more strongly than WGA which, similar to PVL, recognizes GlcNAc and Neu5Ac residues. SNA-I lectin, recognizing α2-6 linked Neu5Ac residues, showed relatively weak reaction with native and only residual reaction with desialylated GPA samples. The data obtained show that SPR is a valuable method to determine interaction of glycoproteins with lectins, which potentially can be used to detect differences in the carbohydrate moiety of individual glycoprotein samples.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of human fibronectin with Candida glabrata epithelial adhesin 6 (Epa6)
Autorzy:
Zajac, Dorota
Karkowska-Kuleta, Justyna
Bochenska, Oliwia
Rapala-Kozik, Maria
Kozik, Andrzej
Tematy:
Candida glabrata
epithelial adhesins
fibronectin
surface plasmon resonance
Pokaż więcej
Wydawca:
Polskie Towarzystwo Biochemiczne
Powiązania:
https://bibliotekanauki.pl/articles/1038757.pdf  Link otwiera się w nowym oknie
Opis:
Adherence of pathogens to extracellular matrix proteins and host cells is one of the essential steps in the microbial colonization of the human organism. The adhesion of C. glabrata, i.e. the second major causative agent of human disseminated candidiases after C. albicans, to the host epithelium mainly engages specific fungal cell wall proteins - epithelial adhesins (Epa) - in particular, Epa1, Epa6 and Epa7. The aim of the present study was to identify the major Epa protein involved in the interactions with the human extracellular matrix protein - fibronectin - and to present the kinetic and thermodynamic characteristics of these interactions. A relatively novel gel-free approach, i.e. the "cell surface shaving" that consists in short treatment of fungal cells with trypsin was employed to identify the C. glabrata surfaceome. Epa6 was purified, and the isolated protein was characterized in terms of its affinity to human fibronectin using a microplate ligand-binding assay and surface plasmon resonance measurements. The dissociation constants for the binding of Epa6 to fibronectin were determined to range between 9.03 × 10-9 M and 7.22 × 10-8 M, depending on the method used (surface plasmon resonance measurements versus the microplate ligand-binding assay, respectively). The identified fungal pathogen-human host protein-protein interactions might become a potential target for novel anticandidal therapeutic approaches.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of Crotalaria verrucosa L. extracts in synthesis of Zinc oxide nanoparticles
Autorzy:
Manokari, M.
Shekhawat, Mahipal S.
Tematy:
crotalaria verrucosa
zinc nitrate
broth solutions
surface plasmon resonance
Pokaż więcej
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1182882.pdf  Link otwiera się w nowym oknie
Opis:
Green synthesis of metal (zinc) oxide nanoparticles is a fascinating subject in the field of nanobiotechnology. Nanoparticles using green plants are suitable for large scale biosynthesis at room temperature with affordable price and eco-friendly nature. The stable nanoparticles were synthesized using leaves, stem, roots, flowers, immature and mature seeds extracts of Crotalaria verrucosa. Zinc Nitrate hexahydrate [Zn(NO3)2•6H2O] was used as precursor material in this experiment. The formation of nanoparticles was monitored by visual color changes and UV-Visible spectrophotometric analysis. UV-Visible absorption peaks between 299-317 nm confirmed the presence of ZnO at nano-scale. The present technique confirmed that this plant species could be explored in the field of nanotechnology for human welfare.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic and thermodynamic characterization of the interactions between the components of human plasma kinin-forming system and isolated and purified cell wall proteins of Candida albicans
Autorzy:
Seweryn, Karolina
Karkowska-Kuleta, Justyna
Wolak, Natalia
Bochenska, Oliwia
Kedracka-Krok, Sylwia
Kozik, Andrzej
Rapala-Kozik, Maria
Tematy:
Candida albicans cell wall
candidiasis
contact system
surface plasmon resonance
Pokaż więcej
Wydawca:
Polskie Towarzystwo Biochemiczne
Powiązania:
https://bibliotekanauki.pl/articles/1038926.pdf  Link otwiera się w nowym oknie
Opis:
Cell wall proteins of Candida albicans, besides their best known role in the adhesion of this fungal pathogen to host's tissues, also bind some soluble proteins, present in body fluids and involved in maintaining the biochemical homeostasis of the human organism. In particular, three plasma factors - high-molecular-mass kininogen (HK), factor XII (FXII) and prekallikrein (PPK) - have been shown to adhere to candidal cells. These proteins are involved in the surface-contact-catalyzed production of bradykinin-related peptides (kinins) that contribute to inflammatory states associated with microbial infections. We recently identified several proteins, associated with the candidal cell walls, and probably involved in the binding of HK. In our present study, a list of potential FXII- and PPK-binding proteins was proposed, using an affinity selection (on agarose-coupled FXII or PPK) from a whole mixture of β-1,3-glucanase-extrated cell wall-associated proteins and the mass-spectrometry protein identification. Five of these fungal proteins, including agglutinin-like sequence protein 3 (Als3), triosephosphate isomerase 1 (Tpi1), enolase 1 (Eno1), phosphoglycerate mutase 1 (Gpm1) and glucose-6-phosphate isomerase 1 (Gpi1), were purified and characterized in terms of affinities to the human contact factors, using the surface plasmon resonance measurements. Except Gpm1 that bound only PPK, and Als3 that exhibited an affinity to HK and FXII, the other isolated proteins interacted with all three contact factors. The determined dissociation constants for the identified protein complexes were of 10-7 M order, and the association rate constants were in a range of 104-105 M-1s-1. The identified fungal pathogen-host protein interactions are potential targets for novel anticandidal therapeutic approaches.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of nano-thin film GO/TiO2 layers for Kretschmann-based surface plasmon resonance visible sensing using FDTD method
Autorzy:
Khairulazdan, N. B.
Mohamed, R.
Berhanuddin, D. D.
Menon, P. S.
Tematy:
surface plasmon resonance
FDTD
titanium dioxide
graphene oxide
Kretschmann
biosensor
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/2033878.pdf  Link otwiera się w nowym oknie
Opis:
Kretschmann-based surface plasmon resonance (K-SPR) is suitable for biomolecular sensing which provides label-free and quick detection results with real-time analysis. In this work, we have investigated the effect of graphene oxide (GO) with titanium dioxide (TiO2) thin films that are placed in hybrid above metal layers such as gold (Au), silver (Ag) and copper (Cu) with the presence of chromium (Cr) as an adhesive layer. The thickness of the Au, Ag and Cu metal thin films were optimized to 40, 30 and 30 nm, respectively, with a fixed thickness of GO of 2 nm and TiO2 of 1.9 nm. The sensing was evaluated for SPR excitation at three different visible wavelengths of 633, 670 and 785 nm. The performance of sensing was analyzed based on the reflectance intensity and full-width at half-maximum (FWHM) of the spectrum using the finite-difference time-domain (FDTD) method. The sensitivity was calculated for analyte sensing in dielectric mediums of air versus water. The sensitivity increment percentage (%∆S ) was determined when comparing analyte detection using Cr/metal and Cr/metal/GO/TiO2 sensor structures. The highest sensitivity of 94.51 deg/RIU was achieved for Cr/Cu/GO/TiO2 K-SPR sensor at 633 nm wavelength.
Dostawca treści:
Biblioteka Nauki
Artykuł

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