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Właściwości termofizyczne meteorytu Sołtmany

100%
Szurgot M., Wach R. A., Przylibski T. A.
Acta Societatis Metheoriticae Polonorum
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2014
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vol. 5
185-186
2
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PROCEDURE FOR DETERMINATION OF THE MOLECULAR WEIGHT OF CHITOSAN BY VISCOMETRY

100%
Czechowska-Biskup R., Wach R. A., Rosiak J. M., Ulański P.
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vol. 23
45 - 54
EN
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.
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SYNTHESIS AND POTENTIAL CYTOTOXICITY EVALUATION OF CARBOXYMETHYL CHITOSAN HYDROGELS

76%
Kłosiński K. K., Girek M. K. G., Wach R. A., Czechowska-Biskup R., Arkuszewski P. T., Szymański P. B., Pasieka Z.
Progress on Chemistry and Application of Chitin and its Derivatives
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2017
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vol. 22
82-96
EN
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.
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