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    Wyświetlanie 1-9 z 9
    Tytuł:
    Właściwości powierzchniowe matryc otrzymanych z poli(L-laktydo-ko-glikolidu) z rysperydonem i ich zmiany po dwóch tygodniach degradacji
    Surface properties of poly(L-lactide-co-glycolide) matrices with risperidone and their changes after two weeks of degradation
    Autorzy:
    Turek, A.
    Jelonek, K.
    Wójcik, A.
    Dzierżewicz, Z.
    Kasperczyk, J.
    Dobrzyński, P.
    Marcinkowski, A.
    Trzebicka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/285548.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    rysperydon
    nośniki leków
    matryce polimerowe
    degradacja
    poli(L-laktyd-ko-glikolid)
    mikroskopia sił atomowych
    risperidone
    drug carries
    polymeric matrices
    degradation
    poly(L-lactide-co-glycolide)
    atomic force microscopy
    Opis:
    W celu optymalizacji leczenia schizofrenii proponowanych jest wiele rozwiązań. Do jednego z nich należy zastosowanie biodegradowalnych, implantowanych systemów uwalniających leki. W niniejszej pracy badano za pomocą mikroskopii sił atomowych zmiany powierzchni matryc otrzymanych z poli(L-laktydo-koglikolidu) (PLAGA) i rysperydonu przed i po dwóch tygodniach degradacji. Analizowano także wpływ degradacji na zmiany ubytku masy matryc polimerowych. Wyniki wskazują na duże możliwości matryc PLAGA do inkorporowania i pułapkowania rysperydonu. Po dwóch tygodniach stwierdzono stabilność matryc (nie uległy one gwałtownej i niekontrolowanej degradacji). Matryce otrzymane z PLAGA posiadają właściwości powierzchniowe odpowiednie dla zastosowania jako biodegradowalne systemy o kontrolowanym uwalnianiu rysperydonu.
    Various solutions are proposed to optimize the therapy of schizophrenia. One of them is the application of biodegradable implantable drug delivery systems. In this work, surface changes of matrices composed of poly(L-lactide-co-glycolide) (PLAGA) and risperidone before and after two weeks of degradation were determined by atomic force microscopy. The influence of degradation on weight loss of matrices was also observed. The results suggest that PLAGA matrices present great potential for incorporation and trapping of risperidone. After two weeks of the studies, the matrices were stable and were not subjected to rapid and uncontrolled degradation. PLAGA matrices have surface properties useful for designing of biodegradable system of controlled risperidone release.
    Źródło:
    Engineering of Biomaterials; 2010, 13, no. 96-98; 117-120
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface functionalization of poly(L-lactide-co-glycolide) membranes with amphiphilic poly(2-oxazoline) for guided tissue regeneration and treatment of bone tissue defects
    Autorzy:
    Tryba, A. M.
    Krok-Borkowicz, M.
    Paluszkiewicz, C.
    Pamuła, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/283890.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    poly (L-lactide-co-glycolide)
    poly (ethylene glycol)
    poly (2-oxazolines)
    phase separation
    Fourier transform infrared spectroscopy (FTIR)
    osteoblast-like cells
    guided tissue regeneration (GTR)
    bone tissue engineering
    Opis:
    The main challenge of this research was to functionalize the surface of poly(L-lactide-co-glycolide) (PLGA) membranes with amphiphilic poly(2-oxazoline) (POx) in order to change PLGA chemical state and properties. Poly(2-oxazolines) are very powerful polymers, which thanks to active pendant groups can be easily functionalized with biologically active molecules or peptides. The membranes were prepared by dissolving PLGA, POx, and poly(ethylene glycol) (PEG, 1000 Da) in methylene chloride (DCM), followed by PEG leaching. POx molecules were preferentially adsorbed at the interface PLGA-POx-PEG thanks to affinity to both hydrophilic (PEG) and hydrophobic (PLGA) chains. The properties of the membranes were characterized with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and wettability tests. Cytocompatibility of the materials in contact with osteoblast-like MG-63 cells was studied by evaluation of cell viability (Alamar-Blue test), live/dead and phalloidin/DAPI staining. The results show that the presence of POx influenced topography of the PLGA membranes, but did not have an impact on their wettability. All membranes were fo-und cytocompatible with model osteoblasts. Presence of POx resulted in better cell adhesion as shown by microscopic studies after fluorescence staining for nuclei and cytoskeleton actin filaments. In summary, one-step phase separation process between PLGA, PEG, and POx, dissolved in DCM followed by drying and PEG leaching resulted in cytocompatible PLGA membranes with immobilised POx, which might be considered for guided tissue regeneration technique in periodontology and in bone tissue engineering.
    Źródło:
    Engineering of Biomaterials; 2018, 21, 147; 16-20
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola powierzchni i struktury w początkowym uwalnianiu rysperydonu z matryc L-PLGA i D,L-PLGA
    Role of surface and structure in the initial release of risperidone from L-PLGA and D,L-PLGA matrices
    Autorzy:
    Turek, A.
    Kasperczyk, J.
    Jelonek, K.
    Dobrzyński, P.
    Walichiewicz, J.
    Krzemińska, K.
    Smola, A.
    Musiał-Kulik, M.
    Marcinkowski, A.
    Libera, M.
    Gębarowska, K.
    Janeczek, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/284922.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    rysperydon
    implantacyjne nośniki leków
    poli (L-laktyd-ko-glikolid)
    poli(D,L-laktyd-ko-glikolid)
    początkowe uwalnianie
    risperidone
    implantable drug carriers
    poly(L-lactide-co-glycolide)
    poly(DL-lactide-co-glycolide)
    initial release
    Opis:
    W niniejszej pracy była opracowywana implantacyjna postać leku zawierająca rysperydon wytworzona z poli(L-laktydo-ko-glikolidu) (L-PLGA) oraz poli(D,L- laktydo-ko-glikolidu) (D,L-PLGA) zastosowanych jako nośniki leku. Ustalano wpływ właściwości powierzchniowych i strukturalnych na początkowe uwalnianie rysperydonu podczas pierwszych 24 godzin inkubacji. W tym celu zastosowano wysokosprawną chromatografię cieczową, spektroskopię magnetycznego rezonansu jądrowego, skaningową kalorymetrię różnicową, skaningowy mikroskop elektronowy oraz mikroskop sił atomowych. We wszystkich analizowanych danych zaobserwowano różnice pomiędzy matrycami wykonanymi z L-PLGA, a matrycami sporządzonymi z D,L-PLGA. Nie wykazano efektu wyrzutu dla żadnego z badanych polimerów, jakkolwiek ilość uwolnionego leku w przypadku matryc D,L-PLGA była prawie pięciokrotnie wyższa. Kopolimer L-PLGA charakteryzował się znacząco większą średnią długością blokówlaktydylowych iglikolidylowych niż D,L-PLGA. Co więcej, zaobserwowano inny charakter powierzchni analizowanych matryc, to znaczy w przypadku L-PLGA powierzchnia była porowata, podczas gdy w przypadku D,L-laktydu nie obserwowano perforacji. Niewątpliwie istnieje zależność między początkowym uwalnianiem rysperydonu, a topografią i strukturą matryc polimerowych. Przypuszcza się, że większe uwalnianie leku z L-PLGA było bardziej związane z właściwościami powierzchniowymi niż ze strukturą matryc. Otrzymane wyniki wskazują na ogromny potencjał obu tych polimerów i możliwość wybrania optymalnego materiału.
    In this work, implantable drug formulation with risperidone on the basis of poly(L-lactide-co-glyco- lide) (L-PLGA) and poly(D,L-lactide-co-glycolide) (D,L-PLGA) as drug carries has been developed. The influence of surface and structural properties on the initial release of risperidone during the first 24 hours has been determined. In this aim, high-performance liquid chromatography, nuclear magnetic resonance spectroscopy, differential scanning calorimetry, scanning electron microscope and atomic force mic¬roscope were used. The differences between L-PLGA and D,L-PLGA matrices in all analyzed data were noted. The burst effect was not revealed for any of the studied polymers, however the released drug was almost five times larger for D,L-PLGA matrices. The L-PLGA copolymer revealed a significantly longer average length of the lactidyl and glycolidyl blocks than D,L-PLGA. Moreover, various characters of surface for analyzed matrices were shown, i.e. in the case of L-PLGA the surface was porous and in the case of D,L-PLGA it was nonporous. Undoubtedly, there were dependences between risperidone's initial release and the topography and the structure of polymeric matrices. We suppose that the larger drug release for L-PLGA was more associated with surface properties than with structure of matrices. The obtained results show the great potential of both polymers and possibility to choose the optimal material.
    Źródło:
    Engineering of Biomaterials; 2013, 16, 118; 30-36
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resorbable scaffolds modified with collagen type I or hydroxyapatite : in vitro studies on human mesenchymal stem cells
    Autorzy:
    Rumian, Ł.
    Wojak, I.
    Scharnweber, D.
    Pamuła, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/307304.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    collagen type I
    human mesenchymal stem cells
    hydroxyapatite
    poly(L-lactide-co-glycolide)
    scaffolds
    kolagen
    hydroksyapatyt
    mezenchyma
    Opis:
    Poly(L-lactide-co-glycolide) (PLGA) scaffolds of pore size within the range of 250–320 μm were produced by solvent casting/ porogen leaching method. Afterwards, they were modified through adsorption of collagen type I and incubation in simulated body fluid (SBF) to allow deposition of hydroxyapatite (HAp). The wettability of the scaffolds was measured by sessile drop test. Scanning electron microscopy (SEM) evaluation and energy dispersive X-ray analysis (EDX) were also performed. SEM evaluation and EDX analysis depicted the presence of HAp deposits and a collagen layer on the pore walls on the surface and in the bulk of the scaffolds. Wettability and water droplets penetration time within the scaffolds decreased considerably after applying modifications. Human mesenchymal stem cells (hMSC) were cultured on the scaffolds for 28 days and cell morphology, proliferation and differentiation as well as calcium deposition were evaluated. Lactate dehydrogenase (LDH) activity results revealed that cells cultured on tissue culture polystyrene (TCPS) exhibited high proliferation capacity. Cell growth on the scaffolds was slower in comparison to TCPS and did not depend on modification applied. On the other hand, osteogenic differentiation of hMSC as confirmed by alkaline phosphatase (ALP) activity and mineralization results was enhanced on the scaffolds modified with hydroxyapatite and collagen.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 1; 61-67
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron annihilation in bioactive glass/poly(glycolide-co-L-lactide) composites
    Autorzy:
    Dryzek, E.
    Cholewa-Kowalska, K.
    Pamuła, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/146311.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    poly(glycolide-co-L-lactide)
    bioglass
    composites
    positron annihilation
    Opis:
    Composites made of bioactive glasses and resorbable polymers are promising biomaterials for bone tissue regeneration. In this study several types of composites produced from bioactive glasses, differing in chemical composition (A2 and S2) and poly(glycolide-co-lactide) (PGLA) were obtained. The resulting composite materials were investigated with positron lifetime spectroscopy and Doppler broadening of annihilation line. It was found that for the composites made of S2 bioglass the intensity of the third positron lifetime component coming from the positronium (Ps) annihilation decreased with increasing in volume fraction of bioglass particles exhibiting behaviour characteristic of microcomposites. For the composites produced from A2 bioglass, such a dependence was not found. The differences obtained may be connected with chemical composition of the bioglass and/or its crystallinity.
    Źródło:
    Nukleonika; 2010, 55, 1; 79-83
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing manufacturing conditions of polymer microspheres as cell carriers for modular tissue engineering
    Autorzy:
    Mielan, Bartosz
    Pamuła, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/1844978.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    modular tissue engineering
    microspheres
    cell culture
    oil-in-water emulsification
    poly(L-lactide-co-glycolide) (PLGA)
    Opis:
    Microspheres (MS) made of biostable polymer, namely polystyrene, have been used as substrates for cell culture enabling rapid cell expansion in dynamic conditions. However, due to non-resorbability, polystyrene (PS) MS when repopulated with cells cannot be directly used in tissue engineering. Our concept was to produce MS from resorbable polymer – poly(L-lactide- -co-glycolide) (PLGA) as a support for adherent cells, e.g. osteoblasts. We hypothesize that such MS can be applied to the injured site to act as cell carriers or as modules for modular tissue engineering (MTE). In this article, we present the results of optimizing the PLGA MS manufacturing conditions via oil-in-water emulsification. Due to such a technique, MS with the required size, size distribution and properties suitable for cell culturing can be obtained. Three parameters of the oil-in-water emulsification were examined: the stirring speed of a water phase during MS manufacturing, the surfactant concentration, i.e. poly(vinyl alcohol) (PVA) in a water phase and concentration of PLGA in dichloromethane (DCM) as an oil phase. The results proved that the 7.5% PLGA concentration in DCM solution as an oil phase, the 0.5-2% concentration of PVA solution as a water phase and the stirring speed of water phase of 1000 rpm provided MS with the 160 μm mean diameter, which is suitable for cell culture. Moreover, the developed sieving and cleaning procedures were efficient to collect MS with the mean diameter of 280 μm, the more coherent size distribution and the ability to sink in the cell culture medium. The presence on the bottom of cell culture wells is crucial for MTE.
    Źródło:
    Engineering of Biomaterials; 2020, 23, 156; 2-9
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of surface and structural properties on the initial release of risperidone from polymeric drug carriers
    Autorzy:
    Turek, A.
    Kasperczyk, J.
    Jelonek, K.
    Dobrzyński, P.
    Walichiewicz, J.
    Krzemińska, K.
    Smola, A.
    Musiał-Kulik, M.
    Marcinkowski, A.
    Libera, M.
    Gębarowska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/284323.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    risperidone
    implantable drug carriers
    poly(L-lactide-co-glycolide)
    poly(DL-lactide-co-glycolide)
    initial release
    Opis:
    In this work, implantable drug formulation with risperidone on the basis of poly(L-lactide-co-glycolide) (L-PLGA) and poly(D,L-lactide-co-glycolide) (D,L-PLGA) as drug carries was developed. The influence of surface and structural properties on the initial release of risperidone during the first twenty four hours was determined. In this aim, high-performance liquid chromatography, nuclear magnetic resonance spectroscopy, scanning electron microscope and atomic force microscope were used. Significant differences between L-PLGA and D,L-PLGA matrices in all analyzed data were noted. The burst effect was not revealed for any of the studied polymers, however the released drug was almost five times larger for D,L-PLGA matrices. The L-PLGA copolymer revealed a significantly longer average length of the lactidyl and glycolidyl blocks than D,L-PLGA. Moreover, various characters of surface for analyzed matrices were shown, i.e. in case of L-PLGA the surface was porous and in case of D,L-PLGA it was nonporous. Undoubtedly, there were dependences between risperidone's initial release and the topography and the structure of polymeric matrices. We suppose that the larger drug release for L-PLGA was more associated with surface properties and thus structure of matrices. The obtained results showed the great potential of both polymers and possibility to choose the optimal polymer.
    Źródło:
    Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 144-146
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron beam sterilization of implantable rods with risperidone and with 17-β-estradiol: a structural, thermal and morphology study
    Autorzy:
    Wilińska, Justyna
    Turek, Artur
    Borecka, Aleksandra
    Rech, Jakub
    Kasperczyk, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/306226.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sterylizacja wiązką elektronów
    17β-estradiol
    rysperydon
    electron beam sterilization
    implantable rods
    poly(L-lactide-co-glycolide-co-trimethylene carbonate)
    risperidone
    17-β-estradiol
    Opis:
    Poly(L-lactide-co-glycolide-co-trimethylene carbonate) rods with risperidone and 17-β-estradiol were sterilized by electron beam irradiation. The aim of the study was to assess electron beam irradiation impact on terpolymer composition, chain microstructure, glass transition temperature, molecular weight and the morphological features of rods. Methods: Hot melt extrusion in the formulation of rods was applied. Sterilization of the rods was performed by electron beam in an electron beam accelerator (10 MeV, 360 mA, 25 kGy). The following methods in the development of rods were applied: nuclear magnetic resonance, differential scanning calorimetry, gel permeation chromatography and scanning electron microscopy. Results: Sterilization influenced only glass transition temperature in blind rods and rods with risperidone. As for the other parameters, no significant changes were observed as far as a sterilization effect is concerned. However, some changes were noted after introducing drug substances and after extrusion. Conclusions: Electron beam irradiation of rods with risperidone and rods with 17-β-estradiol is an adequate method for sterilizing implantable drug delivery systems.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 3; 39-47
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coating of poly(l-lactide-co-glycolide) scaffolds with collagen/glycosaminoglycan matrices and their effects on osteoblast behaviour
    Autorzy:
    Wojak, I.
    Pamuła, E.
    Dobrzyński, P.
    Zimmermann, H.
    Worch, H.
    Scharnweber, D.
    Hintze, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/284646.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    skaffoldy
    kolagen
    osteoblasty
    poly(L-lactide-co-glycolide)
    scaffolds
    collagen type I
    glycosaminoglycans
    hyaluronan
    chondroitin sulfate
    osteoblasts
    Opis:
    Collagen type I and glycosaminoglycans (GAGs) were immobilized on the surfaces of two types of porous biodegradable poly(L-lactide-co-glycolide) (PLGA) scaffolds with pore size in the range of 250-320 µm and 400-600 µm. Two methods of coating were evaluated differing in the way of how the fibrillogenesis solution was introduced into the pores. The distribution of the immunostained collagen in the volume of the scaffolds was analysed with a laser confocal microscope (LSM). The total amount of collagen and GAGs was measured by Sirius Red and Toluidine Blue assays, respectively. The potential of the scaffolds for cell colonization and differentiation was tested in a dynamic cell culture system using human osteosarcoma cells (SAOS-2). The proliferation of SAOS-2 cells was measured by determining the DNA content on days 2 and 7, while differentiation was analyzed by Calcium- and Phosphate-Assays on days 7 and 14. Differentiation of cells was improved by increasing the pore diameter of the scaffolds, and artificial extracellular matrix (aECM) coatings had an additional positive effect for the scaffolds of both pore sizes.
    Źródło:
    Engineering of Biomaterials; 2009, 12, 86; 9-13
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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