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    Wyświetlanie 1-11 z 11
    Tytuł:
    Morphological studies of tissues stabilized by glutaraldehyde and tannic acid
    Autorzy:
    Turek, B.
    Marcinkowski, A.
    Cwalina, B.
    Nożyński, J.
    Dzierżewicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/286147.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    glutaraldehyde
    tannic acid
    porcine pericardium
    microstructure
    nanostructure
    Opis:
    Despite the disadvantages of glutaraldehyde (GA)-stabilization of tissues, it is the method most often used for xenogeneic tissues preparation. Nowadays, partial elimination of drawbacks of this method is achieved by using GA in the mixture with other crosslinking reagents, which completes the stabilization effects and acts synergistically. The aim of this work was to determine microstructure and nanostructure of porcine pericardium stabilized by GA and tannic acid (TA). The microstructure was examined by optical microscopy and the nanostructure by atomic force microscopy (AFM). Different results on the level of micro- and nanostructure were observed. No essential changes in the tissue morphology after crosslinking with GA and TA were observed under optical microscope, but significant morphological differences were revealed in AFM studies.
    Źródło:
    Engineering of Biomaterials; 2009, 12, no. 89-91; 32-34
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of cross-linked chitosan for phosphate removal from aqueous solutions
    Autorzy:
    Filipkowska, Urszula
    Jóźwiak, Tomasz
    Szymczyk, Paula
    Powiązania:
    https://bibliotekanauki.pl/articles/1035181.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    adsorption
    chitosan
    cross-linked chitosan
    epichlorohydrin
    glutaraldehyde
    phosphates
    Opis:
    This study investigated the effectiveness of phosphate adsorption onto non-cross-linked chitosan beads [CHs], and onto chitosan beads cross-linked with glutaraldehyde [ALD-CHs] and epichlorohydrin [ECH-CHs]. The weight ratio of glutaraldehyde to chitosan was 1:2 (w/w), whereas that of epichlorohydrin to chitosan was 2:1 (w/w). The optimal pH value of the phosphate adsorption process was determined at pH 3 for cross-linked chitosan and at pH 4 for noncross- linked chitosan. The time needed to reach the equilibrium concentration reached 60 min for both adsorbents. Experimental data were described with the heterogeneous Langmuir model (double Langmuir equation). The most effective adsorbent of phosphates was shown to be chitosan cross-linked with epichlorohydrin [ECH-CHs] - for which the adsorption capacity reached 139.4 mg/g d.m.CHs. In the case of the remaining adsorbents (chitosan [CHs] and chitosan crosslinked with glutaraldehyde [ALD-CHs]) the adsorption capacity was lower and accounted for 44.38 mg/g d.m.CHs and 108.24 mg/g d.m.CHs, respectively.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 5-14
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chitosan/poly(vinyl alcohol) hydrogels as controlled drug delivery systems
    Autorzy:
    Kocemba, Aleksandra
    Mucha, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1034608.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    chitosan/PVA hydrogel
    gentamicin
    glutaraldehyde
    release kinetics
    swelling
    Opis:
    In order to achieve hydrogel and drug release profiles, a comprehensive knowledge of the types, properties and syntheses of hydrogel polymer networks are needed. For this reason, a natural biopolymer hydrogel based on chitosan was described. Chitosan has many advantages, which meet the requirements necessary for the preparation of medical materials; for example, wound dressings. This article focused on the biomedical use of a chitosan hydrogel: chitosan–poly(vinyl alcohol) (PVA). The method of preparation of hydrogels containing a drug as an active wound dressing was described. To obtain a hydrogel dressing to be applied in patients with burns or difficult curative wounds, gentamicin (an aminoglycoside antibiotic) was used as a medicament. The effect of the PVA concentration in hydrogels on the release rate of the antibiotic was examined. For this, the crosslinking agent of the hydrogel, glutaraldehyde, was used. The release process of gentamicin was described by using an equation of first order kinetics.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 97-105
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of cross-linking with glutaraldehyde on adsorption capacity of chitosan beads
    Autorzy:
    Jóźwiak, Tomasz
    Filipkowska, Urszula
    Rodziewicz, Joanna
    Nowosad, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/1035335.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    adsorption
    chitosan beads
    crosslinking chitosan beads
    dyes
    glutaraldehyde
    Opis:
    The study was undertaken to analyze the effect of chitosan cross-linking with glutaraldehyde on the adsorption capacity of chitosan beads during adsorption of Reactive Black (RB5) and Basic Green (BG4) dyes. Analyses were conducted at three pH values: pH 3.0; 5.0 and 9.0. Results obtained were evaluated with the use of four models of adsorption isotherms Freundlich, Langmuir, Double Langmuir and Redlic-Petreson. The cross-linking of beads with glutaraldehyde turned out to be beneficial for the anionic dye RB5. Compared to the non-cross-linked beads, a comparable adsorption capacity (over 500 mg/g d.m.) was obtained at pH 3.0 and pH 5.0. In the case of the cationic dye, chitosan cross-linking reduced the quantity of adsorbed dye, irrespective of the pH value of the adsorption process.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 35-47
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness of dye adsorption onto non-cross-linked and cross-linked chitosan beads
    Autorzy:
    Filipkowska, Urszula
    Powiązania:
    https://bibliotekanauki.pl/articles/1035401.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    adsorption
    chitosan beads
    cross-linked chitosan beads
    dyes
    glutaraldehyde
    Opis:
    The study was established to analyze the effectiveness of Reactive Black (RB5) and Basic Green (BG4) dyes adsorption onto chitosan beads and onto chitosan beads cross-linked with glutaraldehyde depending on the initial dye concentration in the solution (1, 5, 100 and 200 mg/dm3). It demonstrated that both the initial concentration of dye in the solution as well as the type of adsorbent affected the effectiveness of the adsorption process. An increase in the initial dye concentration in the solution was increasing adsorption effectiveness, irrespective of the type of dye and adsorbent. The cross-linking of chitosan beads with glutaraldehyde turned out to be beneficial only in the case of the RB5 dye.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 43-52
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of cross-linked chitosan for nitrate nitrogen (v) removal from aqueous solutions
    Autorzy:
    Jóźwiak, Tomasz
    Filipkowska, Urszula
    Szymczyk, Paula
    Mielcarek, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1035179.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    adsorption
    chitosan beads
    cross-linked chitosan beads
    dyes
    glutaraldehyde
    Opis:
    This study was aimed at determining the possibility of applying non-cross-linked chitosan (CHs) as well as chitosan cross-linked with glutaraldehyde (CHs-GLA) and epichlorohydrin (CHSECH) for the removal of nitrates (V) from aqueous solutions. The scope of the study included determinations of: optimal pH value of nitrates sorption (from pH range of 2-11), equilibrium time of sorption process, and maximum N-NO3 sorption capacity of the analysed chitosan sorbents. Kinetics of nitrates sorption was described with pseudo-first and pseudo-second order equations, and with the intraparticle diffusion model. Sorption capacity analysis was conducted with the heterogeneous Langmuir model, the double Langmuir model and the Freundlich model. The optimal pH value of N-NO3 sorption onto CHs-GLA and CHs-ECH was pH 3, whereas onto CHs this was pH 4. The equilibrium time of sorption reaction was the same for all chitosan sorbents and reached 120 min. The maximum sorption capacity of CHs, CHs-GLA and CHs- ECH accounted for 12.71 mg N-NO3/g, 34.99 mg N-NO3/g and 38.47 mg N-NO3/g.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 41-52
    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:
    Amano Lipase A grafting onto a silica surface
    Autorzy:
    Zdarta, J.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/81057.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Amano Lipase A
    immobilization
    grafting
    silica surface
    biocatalyst
    hydrolysis
    tetraethoxysilane
    glutaraldehyde
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 1
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic of fish collagen films cross-linked with glutaraldehyde
    Autorzy:
    Kulka-Kamińska, Karolina
    Brudzyńska, Patrycja
    Sionkowska, Alina
    Lewandowska, Katarzyna
    Piwowarski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/27324037.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    collagen
    glutaraldehyde
    cross-linking
    polymer films
    marine sources
    kolagen
    biomateriały
    polimery
    Opis:
    Collagen is a valuable biopolymer in many fields, especially in biomedical sciences. Thanks to its biodegradability and high biocompatibility, it is a desirable material for applications that require contact with the human body. There are many sources of collagen, of which marine-origin collagen has become an important one in recent times. Pure collagen has poor stability and is sensitive to the effects of heat and other external factors. The cross-linking process can improve the properties of collagen materials. Many different methods of cross-linking can be distinguished, including chemical ones. In this study, we were concerned to obtain collagen films modified with glutaraldehyde (GTA). The influence of this additive on the chemical, mechanical, swelling, and hydrophilic properties of the biopolymeric matrix was evaluated. Two different concentrations of collagen were used, as well as three different concentrations of GTA. Results of the analysis showed that the properties of the obtained films were affected by the addition of even a small amount of cross-linker. Spectroscopic measurements indicated minor changes that reflect interactions between GTA and the collagen matrix. Mechanical tests showed changes for modified samples in values of tensile strength, breaking force, and elongation at break. The hydrophilicity decreased slightly for films with GTA. The durability of the modified samples in the swelling test increased. Differences between 1% and 2% collagen films with additives were also observed. The GTA-obtained fish collagen films can be promising materials for biomedical applications.
    Źródło:
    Engineering of Biomaterials; 2023, 26, 168; 25--32
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bakteriobójcze działanie aldehydu glutarowego w stosunku do form wegetatywnych bakterii
    Bactericidal activity of glutaraldehyde on the vegetative forms of bacterie
    Autorzy:
    Krzywicka, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/872464.pdf
    Data publikacji:
    1970
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    bakterie
    formy wegetatywne
    dzialanie bakteriobojcze
    aldehyd glutarowy
    stezenie
    substancje bakteriobojcze
    srodki dezynfekcyjne
    mikroorganizmy
    bacteria
    vegetative form
    bactericidal activity
    glutaraldehyde
    concentration
    disinfectant
    microorganism
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 1970, 21, 1
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concomitant sensitization to glutaraldehyde and methacrylic monomers among dentists and their patients
    Współistniejące uczulenie na aldehyd glutarowy i monomery metakrylanowe u stomatologów i ich pacjentów
    Autorzy:
    Lyapina, Maya G.
    Dencheva, Maria
    Krasteva-Panova, Assya
    Tzekova-Yaneva, Mariana
    Deliverska, Mariela
    Kisselova-Yaneva, Angelina
    Powiązania:
    https://bibliotekanauki.pl/articles/2164298.pdf
    Data publikacji:
    2016-05-31
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    stomatolodzy
    aldehyd glutarowy
    współistniejąca alergia kontaktowa
    monomery metakrylanowe
    studenci stomatologii
    uczniowie technikum dentystycznego
    dental professionals
    glutaraldehyde
    concomitant contact sensitization
    methacrylic monomers
    students of dental medicine
    students of dental technician school
    Opis:
    Background A multitude of methacrylic monomers is used in dentistry. Glutaraldehyde (G) is used in dental practice and consumer products as a broad-spectrum antimicrobial agent. The purpose of our study is to evaluate the frequency and the risk of concomitant sensitization to some methacrylic monomers (methyl methacrylate (MMA), triethyleneglycol dimethacrylate (TEGDMA), ethyleneglycol dimethacrylate (EGDMA), 2,2-bis-[4-(2-hydroxy-3-methacrylo-xypropoxy)phenyl]-propane (Bis-GMA), 2-hydroxy-ethyl methacrylate (2-HEMA) and tetrahydrofurfuryl methacrylate (THFMA)) and glutaraldehyde in students of dentistry, students from the dental technician school, dental professionals and dental patients. Material and Methods A total of 262 participants were included in the study: students of dentistry, students from the dental technician school, dental professionals, and dental patients as a control group. All were patch-tested with methacrylic monomers and glutaraldehyde. The results were subject to the statistical analysis (p < 0.05). Results Among the group of dental students, the highest frequency of concomitant sensitization was to TEGDMA and G (15.5%). In the group of patients the highest frequency of concomitant sensitization was to EGDMA and G (16.4%). The frequency of concomitant sensitization among dental professionals was much lower, with the highest rate to TEGDMA and G (7.7%), too. We consider the students from the dental technician school, where the exposure to glutaraldehyde is less likely, to be the group at a lesser risk of concomitant sensitization. Conclusions Dental students and dental patients could be outlined as groups at the risk of concomitant sensitization to glutaraldehyde and methacrylic monomers. For dental professionals, we assumed an increased risk for concomitant sensitization to TEGDMA and aldehydes that are commonly used in dentistry. We consider the students from the dental technician school to be the group at a lesser risk of concomitant sensitization to glutaraldehyde and methacrylic monomers. Med Pr 2016;67(3):311–320
    Wstęp W stomatologii stosuje się wiele monomerów metakrylanowych, a także aldehyd glutarowy (G), który wchodzi w skład powszechnie dostępnych wyrobów jako środek przeciwbakteryjny. Celem badania była ocena częstości i ryzyka współistniejącego uczulenia u studentów stomatologii, uczniów technikum dentystycznego, lekarzy stomatologów i pacjentów gabinetów dentystycznych na aldehyd glutarowy i niektóre monomery metakrylanowe (metakrylan metylu (methyl methacrylate – MMA), dimetakrylan glikolu trietylenowego (triethyleneglycol dimethacrylate – TEGDMA), dimetakrylan glikolu etylenowego (ethyleneglycol dimethacrylate – EGDMA), 2,2-bis[4-(2-hydroksy-3-metakryloksypropoksy)fenylo]propan (2,2-bis-[4-(2-hydroxy-3- methacrylo-xypropoxy)phenyl]-propane – Bis-GMA), metakrylan 2-hydroksy-etylu (2-hydroxy-ethyl methacrylate – 2-HEMA) i metakrylan tetrahydrofurfurylu (tetrahydrofurfuryl methacrylate – THFMA)). Materiał i metody Badaniem objęto 262 osoby – studentów stomatologii, uczniów technikum dentystycznego i lekarzy stomatologów oraz pacjentów gabinetów dentystycznych jako grupę porównawczą. U wszystkich badanych wykonano testy płatkowe z monomerami metakrylanowymi i aldehydem glutarowym. Uzyskane wyniki poddano analizie statystycznej (p < 0,05). Wyniki Najwięcej studentów stomatologii było uczulonych jednocześnie na TEGDMA i G (15,5%), natomiast najwięcej pacjentów – na EGDMA i G (16,4%). Współistniejące uczulenie u lekarzy stomatologów występowało znacznie rzadziej niż w powyższych grupach – badani najczęściej byli uczuleni jednocześnie na TEGDMA i G (7,7%). W grupie najniższego ryzyka uczulenia współistniejącego znaleźli się uczniowie technikum dentystycznego, u których narażenie na aldehyd glutarowy jest mniej prawdopodobne. Wnioski Studentów stomatologii i pacjentów gabinetów dentystycznych można uznać za grupy ryzyka uczulenia współistniejącego na aldehyd glutarowy i monomery metakrylanowe, lekarzy stomatologów za grupę podwyższonego ryzyka uczulenia współistniejącego na TEGDMA i aldehydy powszechnie stosowane w stomatologii, natomiast uczniów technikum dentystycznego za grupę niskiego ryzyka uczulenia współistniejącego na aldehyd glutarowy i monomery metakrylanowe. Med. Pr. 2016;67(3):311–320
    Źródło:
    Medycyna Pracy; 2016, 67, 3; 311-320
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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