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Tytuł:
Chitosan derivatives - synthesis and characterization
Autorzy:
Szulc, Marta
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1844946.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
chitosan
synthesis
characterization
synteza
charakterystyka
Źródło:
Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 11
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chitosan derivatives - synthesis and characterization
Autorzy:
Szulc, Marta
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1844877.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
chitosan
synthesis
characterization
chitozan
synteza
charakterystyka
Źródło:
Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 11
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cell binding and penetration of quaternized chitosan derivatives
Autorzy:
Zubareva, Anastasia A.
Shagdarova, Balzhima Ts.
Varlamov, Valery P.
Svirshchevskaya, Elena V.
Powiązania:
https://bibliotekanauki.pl/articles/1034738.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
N-[(2-hydroxy-3-trimethylammonium) propyl] chitosan chloride
cell uptake
chitosan
cytotoxicity
quaternized chitosan
trypan blue
Opis:
Chitosan (Ch) is an attractive biopolymer with multiple reactive groups. However it is poorly soluble at neutral pH. Quaternization improves its solubility and permits the development of various positively charged drug delivery systems. The aim of this work was to study the solubility, toxicity, cell binding, and penetration of 20 kDa chitosan with 9, 40, 58 and 98% of quaternary ammonium group substitution (ChQ1 to ChQ4 accordingly). We showed that ChQ with substitution degree >40% was soluble in a wide pH range. Unexpectedly ChQ2 and ChQ3 were more toxic to cells than Ch, ChQ1 and ChQ4. Higher toxicity of ChQ was found against macrophage like cell line RAW264.7 than against epithelial cells MiaPaCa-2. All ChQ, in contrast to unmodified Ch, easily bound and penetrated the cells with the highest uptake by ChQ4. Thus, quaternized chitosan derivatives can be used for biomedical applications.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 217-223
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel chitosan derivatives as films with an antimicrobial effect
Autorzy:
Niemczyk, Agata
El Fray, Mirosława
Powiązania:
https://bibliotekanauki.pl/articles/1035315.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
antimicrobial films
chitosan
dilinoleic acid
fatty acids
Opis:
This paper presents the results of chitosan acylation with linoleic (LA) and dilinoleic acid (DLA). The chemical structures of the new derivatives with different degrees of substitution of LA and DLA were assessed by Fourier transform infrared spectroscopy. Polymer films were prepared by solution casting and drying. The resistance of films to bacterial degradation was tested according ISO 846 standard: “Plastic-Evaluation of the Action of Microorganisms” and the antimicrobial properties were assessed using Gram-negative bacterium Escherichia coli and the fungi Candida albicans in an agar diffusion test. Bioassays showed an antimicrobial effect in direct contact with the material.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 59-66
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of amphiphilic chitosan derivatives as nano/microstructures
Autorzy:
Goszczyńska, A.
Niemczyk, A.
Piegat, A.
Powiązania:
https://bibliotekanauki.pl/articles/284331.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
microstructures
chitosan
drug delivery systems
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 38
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functional-technological properties of meat-and-vegetable emulsions with the addition of chitosan derivatives
Autorzy:
Shestopalova, Irina Anatolyevna
Kolodyaznaya, Valentina Stepanovna
Kiprushkina, Elena Ivanovna
Kuprina, Elena Eduardovna
Petrova, Valentina Aleksandrovna
Rogozina, Elena Andreevna
Danko, Veronika Olegovna
Powiązania:
https://bibliotekanauki.pl/articles/1034377.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan derivative
functional-technological properties
meat-and-vegetable emulsion
micronising
rheological properties
Opis:
This article provides data on the analysis of the properties of chitosan derivatives as a functional ingredient used in food technologies as a structure-forming agent, immunomodulator, enterosorbent of xantobiotics, anti-sclerotic and anti-arthritic factor, and as a regulator of the acidity of gastric juice. The expediency of the use of N-methylallyl-chitosan (chitosan derivative) as a substance that improves the functional-technological (moisture and fat-retaining power) and rheological properties of meat-and-vegetable emulsions is shown. The modes of micronising the emulsion depending on the chitosan derivative mass concentration, the speed of rotation of the knives of the microniser and the processing time were studied. Dependences on the change of moisture and fat-retaining power (MRP, FRP) and effective viscosity (η) on the above-mentioned parameters were investigated. The parameters of micronising were validated: the speed of rotation of the knives (υ) was 2500 rpm, the processing time (τ) was 60 s, υ was 3000 rpm, and τ was 50 s; also, the mass fraction of chitosan derivatives was 0.06%, which ensures the production of meat-and-vegetable emulsions of high quality.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 170-178
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chitosan-derivatives in combinations with selected porphyrinoids as novel hybrid materials for medicine and pharmacy
Autorzy:
Szczepański, Radosław
Gadomska, Laura
Michalak, Marek
Bakun, Paweł
Pawlak, Kacper
Gośliński, Tomasz
Ziegler-Borowska, Marta
Czarczyńska-Goślińska, Beata
Powiązania:
https://bibliotekanauki.pl/articles/1034035.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitin
chitosan
hybrid materials
imaging
photodynamic therapy
porphyrinoids
Opis:
Chitosan and its derivatives are renewable biopolymers characterized by high biocompatibility; therefore, they are harmless to humans and allow immune tolerance and improved hydrophilicity. Moreover, chitosan has been the most studied of all polysaccharides used in biomedical applications during the last decade. Combinations of chitosan and porphyrinoid compounds in hybrid materials have revealed many potential applications for biomedical sciences. The main advantage of such materials is an increase in the solubility of porphyrinoids in body fluids and therefore greater release of singlet oxygen to the treated tissue. Chitosan-based drug delivery systems can improve the targeting of porphyrinoids and their release at predetermined locations and finally achieve desired therapeutic effects with minimal side effects. Hence, porphyrinoid-chitosan materials can be applied in drug delivery systems, cancer theranostics and magnetic resonance imaging. The combination of chitosan and porphyrinoids also appears useful in the healing and repairing of damaged organs, tissue engineering, regenerative medicine, as well as dressing materials. Huge benefits are related to the treatment of wounds, which has been presented for self-healing hydrogels based on chitosan and porphyrinoids. Furthermore, the chitosan/porphyrinoid combinations have revealed enormous benefits for antimicrobial photodynamic therapy.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2020, 25; 63-78
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of c18-fatty acids on chemical structure of chitosan derivatives and their thermal properties
Autorzy:
Niemczyk, Agata
Kmieciak, Alan
El Fray, Mirosława
Piegat, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1034661.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
N
O-acylation
chemical structure
chitosan
fatty acids
thermal properties
Opis:
Chitosan derivatives with a series of fatty acids (FA) have been developed using simultaneous N- and O-acylation reaction by the combination of two ways of conducting the reaction, i.e. a carbodiimide catalysis and ionic amino group protection. The chemical structure of chitosan derivatives as well as the characterization of the FA substitution degree were done by the IR spectra analysis. The correlation between the substitution of the chitosan functional groups as well as the saturation of FA and the changes of structural and thermal properties of the derivatives has been presented.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 165-175
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie pochodnych chitozanu w celu stymulacji wzrostu roślin ozdobnych
Use of chitosan derivatives to improve the growth of ornamentals
Autorzy:
Salachna, P.
Powiązania:
https://bibliotekanauki.pl/articles/400936.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
biopolimery
biostymulator
oligochitozan
polisacharydy
śniedek Saundersa
biopolymers
Giant Chincherinchee
biostimulants
oligochitosan
polysaccharides
Opis:
Obecnie w rolnictwie wzrasta stosowanie bezpiecznych dla środowiska biopolimerów w celu poprawy plonowania roślin. Szczególnie obiecującym biopolimerem jest chitozan i jego pochodne mogące mieć wiele zastosowań w uprawie roślin jako potencjalne biostymulatory. Na temat wpływu ciężaru cząsteczkowego pochodnych chitozanu na wzrost roślin ozdobnych jest niewiele danych. Śniedek Saundersa jest cennym gatunkiem uprawianym w ogrodach, doniczkach i na kwiat cięty, a także ma znaczenie w farmakologii. W eksperymencie zastosowano 0,5% roztwory oligochitozanu o dwóch ciężarach cząsteczkowych (MW 5000 i MW 100 000 g mol-1) do otoczkowania cebul. Biopolimery zostały oznaczone metodą HPLC. Stwierdzono, że otoczkowanie cebul w roztworze oligochitozanu miało stymulujący wpływ na większość analizowanych cech biometrycznych, wskaźniki fizjologiczne i plon cebul. Najkorzystniejszy wpływ na jakość kwiatostanów, przewodność szparkową liści i masę cebul potomnych miało traktowanie roślin oligochitozanem o ciężarze cząsteczkowym MW 100 000 g·mol-1.
Nowadays, the use of natural biopolymers in the field of agriculture has increased in order to achieve sufficient yields and quality. Chitosan and its derivatives have a great potential with various applications in agriculture. Minimal research on effect of chitosan oligomers with different molecular weight on growth ornamental plants has been published. Ornithogalum saundersiae is a valuable species, recommended for cultivation in gardens and green areas, as well as for cut and pot plant. This species can also be potentially used in pharmacology. In the experiment, 0.5% solutions of oligochitosan with molecular weights MW 5000 and 100,000 g·mol-1 were used for coating Ornithogalum saundersiae bulbs. The biopolymers have been characterized using HPLC method. The results indicated that oligochitosan significantly enhanced the growth attributes, physiological parameters, as well as the weight and numerical coefficient of bulbs. Oligochitosan with MW 100,000 g·mol-1 proved best and gave maximum width of inflorescence, number of flowers per inflorescence, stomatal conductance and weight of bulbs over the control.
Źródło:
Inżynieria Ekologiczna; 2017, 18, 6; 63-68
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Express analysis of chitosan and its derivatives by gel electrophoresis
Autorzy:
Konovalova, Mariya
Shagdarova, Balzhima Ts.
Zubov, Vitaliy
Svirshchevskaya, Elena
Powiązania:
https://bibliotekanauki.pl/articles/1034210.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
agarose gel electrophoresis
chitosan
chitosan derivatives
degree of deacetylation
molecular weight
Opis:
Chitosan is one of the most promising polymers for biomedical applications due to its unique properties, such as its biocompatibility, low toxicity, biodegradation, and the presence of reactive amino and hydroxyl groups. Analysis of physicochemical properties of chitosan and its derivatives is a time-consuming process and requires expensive equipment and large amounts of the sample. This paper proposes a method for express analysis of the molecular weight (MW), the degree of deacetylation (DD), the substitution degree (SD), and the charge of chitosan and its derivatives using agarose gel electrophoresis under acidic and neutral conditions with Coomassie staining. Positively charged chitosan samples required acidic Tris Acetate-EDTA (TAE) buffer to move in the gel. The electrophoretic mobility of chitosan depended on MW, DD, SD, and the chitosan charge. Based on the dependences obtained by the proposed method, the MW and DD of commercial chitosan samples were determined. Express analysis of chitosan and its derivatives in agarose gel can be used to monitor the reactions of chitosan modification and to analyse samples with unknown characteristics.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2019, 24; 84-95
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
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