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    Wyświetlanie 1-3 z 3
    Tytuł:
    Procedure for determination of the molecular weight of chitosan by viscometry
    Autorzy:
    Czechowska-Biskup, Renata
    Wach, Radosław A.
    Rosiak, Janusz M.
    Ulański, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1034447.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    Mark-Houwink equation
    capillary viscometry
    chitosan
    intrinsic viscosity
    viscosity-average molecular weight
    Opis:
    The aim of this publication is to facilitate the estimation of chitosan molecular weight (MW) in laboratories with no access to sophisticated analytical instruments, by applying the easily accessible and economical capillary viscometry. The procedure of viscosity-average molecular weight (Mv) determination is described in details. The examples provided encompass testing of the experimental procedure for determination of the Mv of chitosan with a low-molecular weight of 7.7 kDa and 88 kDa, after verification with a high-molecular weight polymer (477 kDa). The experimental work demonstrated the importance of the initial concentration of low-MW chitosan for the accurate determination of intrinsic viscosity and, as a consequence, the viscosity-average molecular weight.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 45-54
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of chitosan and carboxymethyl chitosan hydrogels by electron beam irradiation
    Autorzy:
    Czechowska-Biskup, Renata
    Wach, Radosław
    Stojek, Piotr
    Kamińska, Martyna
    Rosiak, Janusz M.
    Ulański, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1034681.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    PEGDA
    carboxymethyl chitosan
    chitosan
    hydrogel
    radiation crosslinking
    Opis:
    Solutions of chitosan (CS) and carboxymethyl chitosan (CMCS) were subjected to irradiation by electron beam in presence of a crosslinking agent (poly(ethylene glycol) diacrylate - PEGDA) in order to produce carboxymethyl chitosan- and chitosan-based hydrogels. PEGDA macromonomer itself undergoes simultaneous polymerization and crosslinking either in neutral water or in acidic medium. Acidic solutions of chitosan of 0.5, 1 and 2% can be effectively crosslinked with PEGDA to form a gel. Although CMCS undergoes radiation-initiated crosslinking only at high concentration in water (over 10%), the presence of PEGDA in solution facilitated hydrogel formation even at lower concentration of CMCS. Formation of CS and CMCS hydrogels required irradiation doses lower than those needed for sterilization, i.e. 25 kGy, in some cases even as low as 200 Gy. Sol-gel analysis revealed relatively high gel fraction of obtained hydrogels, up to 80%, and good swelling ability. Both parameters can be easily controlled by composition of the initial solution and irradiation dose. Possible mechanisms of crosslinking reactions were proposed, involving addition of the polysaccharide macroradicals to a terminal double bond of PEGDA.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 27-45
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and potential cytotoxicity evaluation of carboxymethyl chitosan hydrogels
    Autorzy:
    Kłosiński, Karol K.
    Girek, Małgorzata K.
    Wach, Radosław A.
    Czechowska-Biskup, Renata
    Arkuszewski, Piotr T.
    Szymański, Paweł B
    Pasieka, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/1034588.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    PEGDA
    XTT
    carboxymethyl chitosan
    cytotoxicity
    hydrogel
    radiation crosslinking
    Opis:
    The aim of the research was to employ radiation to produce flexible carboxymethyl chitosan (CMCS) based hydrogels of uniform structure to characterise their swelling properties and cytocompatibility for potential applications as hydrogel wound dressings. CMCS in aqueous solution was irradiated with an electron beam in the presence of a poly(ethylene glycol) diacrylate (PEGDA) macromonomer as a crosslinker, at 12 different compositions, i.e. 3–20% CMCS, 3 and 5% PEGDA. The obtained hydrogels were subjected to sol–gel analysis. The amount of insoluble fraction (up to 100%) rose with an increase in the PEGDA/polysaccharide ratio. Moreover, the equilibrium degree of swelling, ca. 15 to 200 g of water per g of gel, which was higher for lower content of crosslinker, decreased with the delivered dose, which was associated with an increase in crosslinking density. The in vitro XTT cell viability assay (murine fibroblasts, L929 cell line) showed no significant cytotoxicity of CMCS gels.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 82-96
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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