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    Wyświetlanie 1-8 z 8
    Tytuł:
    Characterization of water state in chitosan hydrogel membranes
    Autorzy:
    Modrzejewska, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/1035471.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    DSC
    chitosan membranes
    hydrogel
    Opis:
    In this study, the structure of hydrogel chitosan membranes was investigated. To determine the structure of hydrogel membranes the Differential Scanning Calorimetry (DSC) was used. On the basis of DSC spectra the enthalpy of the character of water in the structure were determined.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2011, 16; 49-60
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal degradation of double crosslinked hydrogel chitosan membranes
    Autorzy:
    Pieróg, Milena
    Ostrowska-Czubenko, Jadwiga
    Gierszewska-Drużyńska, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/1035381.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    DSC
    FTIR
    chitosan membrane
    thermal degradation
    thermogravimetry
    Opis:
    The thermal degradation behaviour of uncrosslinked and crosslinked chitosan membranes were studied by means of dynamic thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) over the temperature range 25-500ºC in nitrogen atmosphere. Modified chitosan membranes were prepared using a crosslinking method based on covalent crosslinking of chitosan with glutaraldehyde and subsequent ionic crosslinking with sodium citrate, sulfuric acid, sulfosuccinic acid and tripolyphosphate, respectively. Chemical structure of modified chitosan membranes before and after their thermal degradation was characterized by FTIR spectroscopy. Both TGA and DSC experiments as well as spectral results (FTIR spectra of thermal degradation residues) indicated some differences in the mechanism of thermal degradation of uncrosslinked and crosslinked chitosan membranes.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 71-78
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional three-component polymeric biocomposites for the treatment of bedsores
    Autorzy:
    Wiśniewska-Wrona, Maria
    El Fray, Mirosława
    Powiązania:
    https://bibliotekanauki.pl/articles/1034423.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    Chitosan
    FTIR
    NMR
    alginate
    carboxymethyl cellulose
    dressing DSC
    Opis:
    Presented here are the results of investigations into the preparation of three-component dressing materials from various biopolymers in the form of a single-layer film which is suitable as a carrier for pain-relieving (lidocaine) and bacteriostatic (sulphanilamid) therapeutic agents. Physical-chemical, biological and usable properties of the prepared materials were tested and assessed. The amount of added active substance was adopted based on the dose recommended by the Polish Pharmacopeia for external medicinal preparations. Antibacterial activity against gram (-) Escherichia coli and gram (+) Staphylococcus aureus was assessed in some of the biocomposites by quantitative methods. The cytotoxic action in direct contact with the mouse fibroblast NCTC clone 929 was also estimated. Thermal analysis (DSC), infrared spectrophotometry (FTIR) and nuclear magnetic resonance spectroscopy were employed to investigate the impact of the variable contents of chitosan, alginate, carboxymethyl cellulose (CMC), and the active substance upon the chemical- and phase-structure of the prepared three-component polymeric biocomposites. It was found that the quantitative composition of the biocomposites and the additive of active substances lidocaine and sulphanilamide exert a vital impact upon their physical-mechanical and usable properties (imbibition, absorption). Investigations into the release of the medicinal substance from the investigated biocomposites to an acceptor fluid led to the conclusion that the kinetics of the process may be described by a complex first order rate equation with two exponential functions.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 185-206
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of physicochemical properties of solid dispersions of bcs class ii substances with chitosan
    Autorzy:
    Grimling, Bożena
    Górniak, Agata
    Meler, Jan
    Pluta, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1035366.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    DSC studies
    chitosan
    dissolution
    fenofibrate
    solid state lyophilisation
    Opis:
    The BCS class II includes drugs with low solubility and high permeability. The substances require modification to increase their solubility in the upper part of the digestive system. Fenofibrate is an example of this class drugs. The aim of the study was to investigate the effect of chitosan on the solubility of fenofibrate incorporated into this polymer carrier. The study investigated fenofibrate in solid dispersions using a method of the solvent evaporation by means of freeze-drying at the drug to polymer ratio of 3:7,5:5,7:3. The study revealed a multi-fold increase (from 33 to 57 times) in fenofibrat solubility in the presence of chitosan, which increased with duration of the study and with increasing percentage of the polymer in formulations. DSC examination revealed a possible physical interaction between the drug and the polymer. The degree of lowering of temperature and increased heat effects is correlated with increased solubility of the drug in all the formulations. DSC studies confirmed that fenofibrate is present in solid dispersions in a crystalline form.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 87-94
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of ionic crosslinking on thermal properties of hydrogel chitosan membranes
    Autorzy:
    Gierszewska-Drużyńska, Magdalena
    Ostrowska-Czubenko, Jadwiga
    Powiązania:
    https://bibliotekanauki.pl/articles/1035522.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    DSC
    TG/DTG
    chitosan
    crosslinking
    hydrogel
    thermal stability
    Opis:
    Ionically crosslinked one‑component chitosan (Ch), two‑component chitosan/sodium alginate (Ch/NaAlg) and chitosan/pentasodium tripolyphosphate (Ch/TPP) membranes as well as three‑component chitosan/sodium alginate/pentasodium tripolyphosphate (Ch/NaAlg/TPP) membranes were prepared. Formation of ionic interactions between Ch and NaAlg and/or TPP was confirmed by FTIR analysis. An effect of a crosslinking process on thermal properties of hydrogel membranes was examined using TG/DTG/DTA and DSC methods. Changes in the number of thermal degradation steps of the studied hydrogel membranes were observed. Considering the temperature at which thermal degradation starts as a criterion of the thermal stability, it was concluded that the thermal stability increases according to the series: Ch/NaAlg ≈ Ch/NaAlg/TPP ≈ Ch/TPP
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 25-32
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    State of water in citrate crosslinked chitosan membrane
    Autorzy:
    Ostrowska-Czubenko, Jadwiga
    Pieróg, Milena
    Powiązania:
    https://bibliotekanauki.pl/articles/1035556.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    DSC method
    chitosan membrane
    state of water
    trisodium citrate
    Opis:
    The ionically crosslinked membranes were prepared of chitosan (Ch) and trisodium citrate (Ch/CIT). The characteristics of the state of water in crosslinked and uncrosslinked chitosan membranes with different water content was performed by differential scanning calorimetry (DSC). The kinetics of water swelling in Ch and Ch/CIT membranes were also studied. Conclusions concerning effect of ionic crosslinking on the state of water in chitosan hydrogel membranes were drawn out. Results shows that freezable and non-freezable water exist in analysed Ch and Ch/CIT membranes, while there are variations in the amount of non-freezing bound water in these polymers.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 33-40
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    State of water in noncrosslinked and crosslinked hydrogel chitosan membranes – dsc studies
    Autorzy:
    Ostrowska-Czubenko, Jadwiga
    Pieróg, Milena
    Gierszewska-Drużyńska, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/1035477.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    DSC
    chitosan membranes
    crosslinking
    glutaraldehyde
    states of water
    trisodium citrate.
    Opis:
    Modified chitosan hydrogel membranes were prepared using glutaraldehyde (GA) and sodium citrate (NaCIT) as crosslinking agents. Molecular and supermolecular structure analyses of unmodified and modified chitosan membranes have been conducted by FTIR and X-ray spectroscopy. FTIR results showed covalent and ionic crosslinks formation between chitosan (Ch) and GA or simultaneously Ch, GA and NaCIT. The state of water in noncrosslinked and crosslinked chitosan membranes were analysed by differential scanning spectroscopy (DSC). Three types of water in hydrogel membranes were found: non-freezing bound water, freezing bound water and freezing free water, while there were variations in the amount of non-freezing bound water in these polymers. The effect of ionic crosslinking on water state, mainly on the nonfreezing water content, was discussed.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2011, 16; 147-156
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The investigation of physicochemical properties of the solid dispersions in the presence polymeric carrier- chitosan
    Autorzy:
    Grimling, Bożena
    Meler, Jan
    Pluta, Janusz
    Górniak, Agata
    Powiązania:
    https://bibliotekanauki.pl/articles/1035561.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    DSC
    IR studies
    chitosan
    fenofibrate
    physical mixtures
    saturation solubility
    solid dispersions
    Opis:
    The BCS class II includes drugs with low solubility and high permeability.. Fenofibrate is an example of this class drugs. The aim of the study was to investigate the effect of chitosan on the saturation solubility of fenofibrate incorporated into this polymer carrier. The study investigated fenofibrate in solid dispersions using a method of the solvent evaporation and physical mixtures at the drug to polymer ratio of 1:9,3:7,5:5.Solid dispersion of fenofibrate containing different ratio of medium and high molecular weight chitosan showed high saturation solubility compared to pure sample of drug. IR spectroscopy reveals that there was no chemical interaction between drug and the polymer. DSC studies showed that there is no change in the crystal structure of drug during the solid dispersion technique. Chitosan has been proposed as a useful excipient for enhancing the bioavailability of poorly water-soluble compounds.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 167-173
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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