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Tytuł:
Biopolymer composites based on lignin and microcrystalline chitosan
Autorzy:
Kopania, Ewa
Wiśniewska-Wrona, Maria
Powiązania:
https://bibliotekanauki.pl/articles/1034711.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
biopolymer composites
black liquid
lignin
medical and hygienic products
microcrystalline chitosan
Opis:
The article presents method of extracting lignin from hardwood and softwood after chemical treatment. Lignin fractions were extracted from black liquid (the by-product of pulp and paper industry), in a different reaction environment. Biopolymer composites were obtained by combining extracted lignin fraction and microcrystalline chitosan, which can be used as preparations for innovative biopolymer materials that are applicable in medical and hygienic products. The studies were performed in order to evaluate MCCh/Lignin composites to suitability to construction of dressing materials in the form of sponges. The MCCh/Lignin composites were tested for different properties: mechanical, sorption and absorption. The obtained lignin fractions and MCCh/Lignin composites were characterized by different structures and chemical purity as confirmed by FTIR spectra.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 122-134
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biopolymer composites based on galactoglucomannans (ggms) and micrystaline chitosan (mcch)
Autorzy:
Kopania, Ewa
Wiśniewska-Wrona, Maria
Powiązania:
https://bibliotekanauki.pl/articles/1034988.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
biopolymer composites
enzymatic treatment
galactoglucomannans
microcrystalline chitosan
spruce
thermal treatment
Opis:
The article presents a method of extracting galactoglucomannas (GGMs) from softwood (spruce). GGMs were extracted using thermal and enzymatic treatment in an aqueous environment. The extracted GGMs, depending on the extraction method, were characterized by different composition of simple carbohydrates i.e. glucose, galactose and mannose, as well as by the average molecular weight. Evaluation of the composition of GGMs obtained was performed using GC/MS and SEC. Biopolymer composites were obtained by combining GGMs and microcrystalline chitosan (MCCh), which can be used as preparations for plant protection and growth stimulation. The studies were performed in order to evaluate biological activity of composites based on Petri dish test in which their ability to stimulate seed germination of selected plants was estimated. The effect of plant growth stimulation depended on GGMs composition of simple carbohydrates. GC/MS and SEC chromatographic tests and 13C NMR analysis enabled to establish the composition and structural changes of the obtained GGMs and biocomposites
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 110-121
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości fizykochemiczne i funkcjonalne biokompozytów polimerowych
Physicochemical and functional properties of polymer biocomposites
Autorzy:
Wiśniewska-Wrona, Maria
El Fray, Mirosława
Powiązania:
https://bibliotekanauki.pl/articles/947105.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
rany odleżynowe
chitozan
alginian
opatrunek w postaci jednowarstwowej błony
FT-IR
DSC
NMR
bedsores
chitosan
alginate
single layer film wound dressing
Opis:
Otrzymano błony biokompozytowe wytworzone na bazie chitozanu (Chit) i alginianu sodu (Alg) z udziałem substancji leczniczych o działaniu przeciwzapalnym (siarczan cynku) i przeciwbakteryjnym (sulfanilamid). Metodami spektrofotometrii w podczerwieni (FT-IR), magnetycznego rezonansu jądrowego (NMR) oraz różnicowej kalorymetrii skaningowej (DSC) oceniono wpływ zawartości chitozanu i alginianu na budowę chemiczną i temperaturę przemian fazowych biokompozytów. Analiza termiczna wykazała, że dodatek substancji leczniczych do materiałów biokompozytowych wpływa zarówno na obniżenie ich temperatury topnienia, jak i na zmniejszenie entalpii związanej z tą przemianą.
Biocomposite films based on chitosan (Chit) and sodium alginate (Alg) and containing anti-inflammatory (zinc sulfate) and antimicrobial (sulfanilamide) pharmaceutical ingredients were prepared. The effects of variable chitosan and alginate contents on the chemical structure and phase transition temperatures of biocomposites were studied using infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) and differential scanning calorimetry (DSC). Thermal analysis showed that the addition of pharmaceuticals decreased the melting temperature and melting enthalpy of polymer biocomposites.
Źródło:
Polimery; 2019, 64, 1; 23-33
0032-2725
Pojawia się w:
Polimery
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:
Zastosowanie polimerów naturalnych do uszlachetniania materiału siewnego
The use of natural polymers for treatments enhancing sowing material
Autorzy:
Korbecka-Glinka, Grażyna K.
Wiśniewska-Wrona, Maria
Kopania, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1789915.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
zaprawianie nasion
otoczkowanie nasion
biopolimery
patogeny
biodegradacja
bioaktywność
seed dressing
seed coating
biopolymers
pathogens
biodegradation
bioactivity
Opis:
Biopolimery z grupy polisacharydów, dzięki swoim właściwościom fizykochemicznym, podatności na modyfikację chemiczną i biodegradację oraz wysoką bioaktywność, są wykorzystywane do uszlachetniania materiału siewnego roślin uprawnych. Polimery naturalne, takie jak: chitozan, alginian, celuloza, galaktoglukomannany, lignina oraz guma gellanowa mogą być stosowane jako substancje wiążące w otoczkowaniu nasion lub jako nośnik substancji aktywnych i mikroorganizmów. Biopolimery zawarte w otoczkach lub zaprawach nasiennych mogą ponadto przyczyniać się do ograniczenia niekorzystnego wpływu środowiska i patogenów na kiełkujące nasiona.
Biopolymers from a group of polysaccharides are used in treatments enhancing sowing material of crops due to their physical and chemical properties, susceptibility to chemical modification, biodegradability and high bioactivity. Natural polymers, such as: chitosan, alginian, celulose, galaktoglucomannans, lignin and gellan gum, can be used as binders in seed coating or carriers of active substances and microorganisms. Moreover, biopolymers contained in the seed coatings and seed dressings can protect germinating seeds from unfavorable influence of environment and pathogens.
Źródło:
Polimery; 2021, 66, 1; 11--20
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of oligochitosans in regulation of cellular activity and location of pyruvate kinase (pk) isoenzyme m2 that affects proliferation of ehrlich ascites tumor cells (eat)
Autorzy:
Ignacak, Jan
Wiśniewska-Wrona, Maria
Pałka, Iwona
Niekraszewicz, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/1035209.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
isoenzyme M1 and M2 pyruvate kinase
nucleus
oligochitosans
ε-methyl-L-lysyne
Opis:
The pyruvate kinase isoenzyme M2 originating from the nucleoplasm and cytoplasm of tumor cells, with its highest affinity to the 2-phosphoenolpyruvate (2-PEP) and sensitivity to L-cysteine, contributes to an increased generation of energy as ATP, necessary for tumor cell proliferation. In the presence of L-cysteine, the isoenzyme M2 PK demonstrates the activity of histone kinase, transferring the phosphoryl group from 2-PEP to the ε-amine residue of the H1 histone lysine. Oligochitosans induce expression of the inducible nitric oxide synthase gene (iNOS), what results in an increased synthesis of nitric oxide, which reacts with L-cysteine and produces L-S-nitrosocysteine. Lack of L-cysteine contributes to inhibition of kinase activity of the H1 histone, an M2 PK isoenzyme. Decreased phosphorylation of the H1 histone contributes to inhibition of EAT cell proliferation. No effect on proliferation of normal cells that include the PK M1 isoenzyme has been observed in the presence of oligochitosans.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 67-76
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of oligochitosans in regulation of cellular activity and location of pyruvate kinase (pk) isoenzyme m2 that affects proliferation of ehrlich ascites tumor cells (eat)
Autorzy:
Ignacak, Jan
Wiśniewska-Wrona, Maria
Pałka, Iwona
Niekraszewicz, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/1035231.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
isoenzyme M1 and M2 pyruvate kinase
nucleus
oligochitosans
ε-methyl-L-lysyne
Opis:
The pyruvate kinase isoenzyme M2 originating from the nucleoplasm and cytoplasm of tumor cells, with its highest affinity to the 2-phosphoenolpyruvate (2-PEP) and sensitivity to L-cysteine, contributes to an increased generation of energy as ATP, necessary for tumor cell proliferation. In the presence of L-cysteine, the isoenzyme M2 PK demonstrates the activity of histone kinase, transferring the phosphoryl group from 2-PEP to the ε-amine residue of the H1 histone lysine. Oligochitosans induce expression of the inducible nitric oxide synthase gene (iNOS), what results in an increased synthesis of nitric oxide, which reacts with L-cysteine and produces L-S-nitrosocysteine. Lack of L-cysteine contributes to inhibition of kinase activity of the H1 histone, an M2 PK isoenzyme. Decreased phosphorylation of the H1 histone contributes to inhibition of EAT cell proliferation. No effect on proliferation of normal cells that include the PK M1 isoenzyme has been observed in the presence of oligochitosans.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 67-76
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymer biocomposites used in bedsores treatment
Autorzy:
Wiśniewska-Wrona, Maria
Kucharska, Magdalena
Kardas, Iwona
Bodek, Andrzej
Bodek, Henryka
Powiązania:
https://bibliotekanauki.pl/articles/1035413.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
bacteriostatic agent
bedsore
dressing
film
polymeric biocomposites
Opis:
Investigations are presented in the preparation of composite dressing material based on two biopolymers -chitosan and sodium alginate with the addition of sulfanilamide as medication designed for the healing of bedsores. The dressing was prepared in the form of film. The biopolymers used in the construction of the film make the dressing biodegradable and resorbable in the wound’s environment. Mechanical properties of the film were tested: thickness, extension strength, tenacity and elongation at maximum stress The ability of the material to match the wound was examined, too, as well as the transmission of water vapor. Sulfanilamide as bacteriostatic agent was added to the prepared composites. Mechanical and sorption properties of the composite dressings with addition of the active substance depend largely on their composition. The sorption properties were tested before and after addition of the medication .The release of the medication is intricate and proceeds according to kinetics of first order. Susceptibility of the composite materials to hydrolytic and enzymatic degradation was assessed.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2011, 16; 111-120
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of chitosan oligomers in regulation of ehrlich ascites tumor cells proliferation in vitro
Autorzy:
Ignacak, Jan
Wiśniewska-Wrona, Maria
Pałka, Iwona
Zagajewski, Jacek
Niekraszewicz, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/1035427.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
EAT cells proliferation
L-S-nitrosocysteine.
chitosan oligomers
pyruvate kinase M2 isoenzyme
Opis:
Preliminary studies of proliferation of Ehrlich ascites tumor (EAT) cells and normal mammary gland epithelial cells have demonstrated the process to be inhibited by degradation products of microcrystalline chitosan, i.e. oligomers. Inhibition of proliferation has been also accompanied by a decreased activity of the M2 pyruvate kinase (PK) isoenzyme in nucleoplasm, what may indicate the role of this enzyme in regulation of tumor cell proliferation. Determinations of nitrogen oxide in tumor and normal cells point to a higher level of this endogenous effector in normal cells. An increase of nitrogen oxide levels in Ehrlich ascites tumor cells effected by chitosan oligomers may indicate increased nitrosylation, and particularly an increased amount of compounds containing sulfhydryl groups and their participation in regulation of nucleoplasm M2 PK isoenzyme activity. Chitosan oligomers have smaller molecules as compared to microcrystalline chitosan and for this reason appear to be more effective than the latter in acting upon the negatively charged cell membrane surfaces, thus contributing to proliferation inhibition.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2011, 16; 89-98
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of chitosan on the synthesis of l-s-nitrosocysteine that participates in the regulation of the m2 pyruvate kinase isoenzyme activity associated with ehrlich ascites cells proliferation in vitro
Autorzy:
Ignacak, Jan
Zagajewski, Jacek
Pałka, Iwona
Wiśniewska-Wrona, Maria
Niekraszewicz, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/1035527.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
L-S-nitrosocysteine
L-cysteine
inhibition of EAT cell proliferation
microcrystalline chitosan
pyruvate kinase M2 isoenzyme
Opis:
L-S-nitrosocysteine formation in EAT tumor cells and normal CRL-1636 cells incubated with microcrystalline chitosan was confirmed by RP-HPLC. The metabolite was identified based on UV-VIS spectra. The formation of L-S-nitrosocysteine in EAT tumor cells contributes to decreasing the level of L-cysteine in these cells. L-cysteine as an effector of the bifunctional M2 isoenzyme of pyruvate kinase (PK) initiates its histone kinase activity, which is responsible for histone H1 phosphorylation. A decrease of L-cysteine level in EAT tumor cells contributes to lack of histone H1 phosphorylation by the M2 PK isoenzyme and by the same token to inhibition of EAT cell proliferation.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 149-158
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
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