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Wyszukujesz frazę "emulsification" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Preparation of micro and nanostructures of chitosan by ultrasonic coalescence of w/o emulsions
    Autorzy:
    Balcerzak, Jacek
    Kucharska, Magdalena
    Gruchała, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1035322.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    chitosan
    microspheres
    nanospheres
    precipitation
    ultrasonic emulsification
    Opis:
    In the paper, the preeliminary study of chitosan micro and nanospheres precipitation due to two reverse emulsions (W/O) coalescence is described. The composition conditions, which must be filled to obtain stable reverse emulsion is pointed out. Furthermore, the parameters of ultrasonic emulsification and coalescence technique are presented and finally, morphological study of obtained micro and nanospheres are discussed.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 13-20
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chitosan and chitosan-polyethylenimine microspheres prepared by membrane emulsification and their application for drug delivery systems
    Autorzy:
    Wolska, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1034551.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    chitosan
    membrane emulsification
    microspheres
    polyethyleneimine
    release
    sorption
    Opis:
    The aim of this paper was to prepare chitosan microspheres characterised by a narrow dispersion of dimensions, suitable for application for drug delivery systems (DDS). The materials, unmodified as well as functionalised using polyethyleneimine were then used for encapsulation of drug-mimicking dyes. The polymeric beads were prepared by one stage process of membrane emulsification. The encapsulation and then evaluation of the release of an active component was carried out using two cytostatics-mimicking dyes: methyl orange and Congo red. The efficiency of encapsulation changed with a type of microspheres and the type of a dye. The highest sorption towards dyes was revealed by PEI-modified chitosan microspheres. Methyl orange was released with the better efficiency than Congo red from all types of microspheres.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 220-235
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chitosan microspheres prepared by membrane emulsification for chromium removal from aqueous solutions
    Autorzy:
    Wolska, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1034646.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    biosorption
    chitosan
    chromium VI
    membrane emulsification
    microspheres
    modification
    Opis:
    Chitosan is naturally abundant biopolymer that could be used as chelating sorbent for removal of metal ions from aqueous solutions. In this study the uniform-sized chitosan microspheres and their modified derivatives were prepared by using the one stage membrane emulsification process. The obtained sorbents were used for removal of chromium VI ions. The sorption evaluation was carried out at different initial ion concentrations and allowed to fit the experimental data to Langmuir isotherm in the case of unmodified materials and to Freundlich isotherm in the case of modified microspheres. The highest sorption towards chromium has been shown by unmodified chitosan with medium molecular weight. The calculated maximum sorption capacity for this polymer was found to be 1.6 mmol/g.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 203-216
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    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
      Wyświetlanie 1-4 z 4

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