Temat: ε-caprolactone - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Using polymers: utopia or reality?
Autorzy:: Dubruel, P.
Desmet, T.
Vlierberghe, S. van
Musial, O.
Cornelissen, R.
Declercq, H.
Berneel, E.
Tematy:: polymers
medicine
poly(ε-caprolactone); Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/284926.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Biological property poly(ε- caprolactone) as potential material for reproduction devices
Autorzy:: Wieczorek, R.
Stodolak-Zych, E.
Kosenyuk, Y.
Tematy:: poly(ε-caprolactone)
reproduction
biomaterials; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/284532.pdf Link otwiera się w nowym oknie
Opis:: The main limitation of embryos transfer is the lack of catheters for their obtaining and transferring which would have desirable and confirmed biological properties ensuring high bioconcordance and low toxicity. Catheters used routinely for embryos obtaining and transfer are tools used for insemination, urology and other medical purposes, but their bioconcordance with embryos was never confirmed. For these reasons in our studies we attempted to develop the modern set of catheters designed for the contact with embryos, based on the biomaterial characterized by good biological and mechanical properties such as with optimal resilience and elastic properties, and capable to be free shaped in the form of a tube of 1-2 mm diameter. The material which hypothetically fulfills biological requirements and at the same time gives possibility of free shaping is resorbable polymer used for the long time in many fields of medicine is poly-ε-caprolactone (PCL). Because of its biological and physical properties it was taken into consideration to use this biomaterial for in vitro embryos culture and for cryoconservation. The aim of the study was verification of biological properties of poly-ε-caprolactone (PCL) as the material dedicated to biotechnology of animal reproduction and gynecology and evaluation of possibility of poly-ε-caprolactone (PCL) application as a potential material for production of medical devices, as catheters for obtaining and transporting of embryos as well as dishes for embryos culture in vitro and covers for cryoconservation. The possible application of this biomaterial needs verification of its biological properties on embryos culture. The foil discs made of the polycaprolactone, thickness 0.5 mm, diameter 3.5 mm, were prepared in two forms: the reference one (nPCL) and thermally modified by freezing in liquid nitrogen (mPCL). The verification of PCL bioconcordance was performed by evaluation of 102 pig embryos at the development stage of 2 to 4 blastomers. To evaluate poly-ε-caprolactone bioconcordance 5-day long culture of the embryos was performed on the evaluating material, not frozen (nPCL) and frozen in liquid nitrogen (mPCL) and additionally culture after short contact with poly-ε-caprolactone lasting 15 minutes (nPCL-15). In all evaluated study groups the development of embryos was suppressed shortly after transfer to the culture with PCL. In the control group 74-78% of the embryos reached blastocyst stage. Because of cytotoxic influence of polycaprolacton on embryos it cannot be used as the material for catheter production used in biotechnology of animal reproduction and other materials used for in vitro culture and cryoconservation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Biocatalytic synthesis of δ-gluconolactone and ε-caprolactone copolymers
Autorzy:: Todea, Anamaria
Badea, Valentin
Nagy, Lajos
Kéki, Sándor
Boeriu, Carmen
Péter, Francisc
Tematy:: ε-caprolactone
d-gluconolactone
lipases
biopolymers; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1039277.pdf Link otwiera się w nowym oknie
Opis:: The biodegradability and biocompatibility properties of ε-caprolactone homopolymers place it as a valuable raw material, particularly for controlled drug delivery and tissue engineering applications. However, the usefulness of such materials is limited by their low hydrophilicity and slow biodegradation rate. In order to improve polycaprolactone properties and functionalities, copolymerization of ε-caprolactone with δ-gluconolactone was investigated. Since enzymatic reactions involving sugars are usually hindered by the low solubility of these compounds in common organic solvents, finding the best reaction medium was a major objective of this research. The optimal copolymerization conditions were set up by using different organic media (solvent and solvents mixtures), as well as solvent free systems that are able to dissolve (completely or partially) sugars, and are nontoxic for enzymes. Native and immobilized lipases by different immobilization techniques from Candida antarctica B and Thermomyces lanuginosus have been used as biocatalyst at 80°C. Although the main copolymer amount was synthesized in DMSO:t-BuOH (20:80) medium, the highest polymerization degrees, up to 16 for the copolymer product, were achieved in solventless conditions. The products, cyclic and linear polyesters, have been characterized by FT-IR and MALDI-TOF MS analysis. The reaction product analysis revealed the formation of cyclic products that could be the major impediment of further increase of the chain length.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Poly(ε-caprolactone) as potential material for catheters to xenogeneic transplantations and embryologic devices
Autorzy:: Stodolak-Zych, E.
Wieczorek, J.
Para, U.
Tematy:: transplantation
poly(ε-caprolactone)
embryologic devices; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/284854.pdf Link otwiera się w nowym oknie
Opis:: The paper presents study performed to investigate the possible use of modified poly(ε-caprolactone) as a potential material for catheters. Experiment verifies if thermal modification using liquid nitrogen (LN) changes microstructure, biostability, mechanical and physicochemical properties of polymer. The easiness of forming material into tubes to confirm handiness was checked.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The effect of bioactive glass particle size on properties of poly(ε-caprolactone) based membranes
Autorzy:: Dziadek, M.
Zagrajczuk, B.
Pukas, K.
Cholewa-Kowalska, K.
Tematy:: bioactive glasses
membranes
poly(ε-caprolactone); Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/284146.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Verification of biological properties of poly-ε-caprolacton (PCL) as the material dedicated to medicine and biotechnology
Autorzy:: Wieczorek, J.
Grad, I.
Stodolak-Zych, E.
Kosenyuk, Y.
Tematy:: embryos
poly(ε-caprolactone) (PCL)
culture
catheters
pigs; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/285736.pdf Link otwiera się w nowym oknie
Opis:: The aim of the study was evaluation of possibility of poly-ε-caprolacton (PCL) application as potential material for production of medical devices, as catheters for obtaining and transporting of embryos as well as dishes for embryos culture in vitro and covers for cryoconservation. The possible application of this biomaterial needs verification of its biological properties on embryos culture. The foil discs made of policaprolacton, thickness 0.5 mm, diameter 3.5 mm, were prepared in two forms: the baseline one (nPCL) and thermally modified by freezing with liquid nitrogen (mPCL). The verification of PCL bioconcordance was performed by evaluation of 102 pig embryos. To evaluate poly-ε-caprolacton bioconcordance we performed 5-day long culture of embryos on the evaluated material, not frozen (nPCL) and frozen in liquid nitrogen (mPCL) and additionally culture after short contact with poly-ε-caprolacton, lasting 15 minutes (nPCL-15). In all evaluated study groups the development of embryos was suppressed shortly after transfer to the culture with PCL. In the control group. 74%-78% of embryos reached blastocyst stage. Polycaprolacton cannot be used as the material for catheter production used in biotechnology of animal reproduction and other materials used for in vitro culture and cryoconservation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Physicochemical characteristics of chitin-polyester systems in dependence on their composition
Autorzy:: Sobecki, Paweł P.
Pabin-Szafko, Barbara
Szumilewicz, Joanna
Tematy:: biodegradable
blends
dibutyrylchitin
poly(ε-caprolactone)
polyesters
polylactide; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Powiązania:: https://bibliotekanauki.pl/articles/1035429.pdf Link otwiera się w nowym oknie
Opis:: In order to improve the properties of their individual components, the compositions of dibutyrylchitin (DBC) and aliphatic polyesters (PCLG) were prepared and examined. The studied systems are homogeneous in a wide range of composition and molar masses of their components. The homogeneities of the blends made it possible to form smooth and transparent films, which were investigated by mechanical testing. It was found that the chemical structure and molar mass of a polyester component had an effect on mechanical properties of the systems. The films were subjected to hydrolytic degradation in media of various pH values (4.0, 7.4 and 13.0) at 37 °C. Furthermore, it was found that the molar mass and composition of the PCLG component clearly affected the rate of hydrolysis of the studied systems. The effect of hydrophilicity of the DBC/PCLG blends on degradation rate was also investigated. Consequently, by an appropriate choice of the components it is possible to control the profile of hydrolytic degradation of the DBC/PCLG systems.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Needle-punched fibrous polycaprolactone scaffold for bone tissue engineering
Autorzy:: Rajzer, I.
Grzybowska-Pietras, J.
Fabia, J.
Sarna, E.
Tematy:: needle-punched nonwovens
scaffold
hydroxyapatite
poly(ε-caprolactone); Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/284522.pdf Link otwiera się w nowym oknie
Opis:: In the present work a three dimensional composite scaffolds for bone tissue engineering were created by a carding and needle-punch processes. Highly porous nonwoven fabrics were obtained from PCL and PCL/n-HAp cut fibers without the use of any chemicals during the manufacturing process. The properties of nonwoven scaffolds were examined by SEM, FTIR, DSC and TGA methods. The average pore diameter as well as the pore size distribution of nonwoven fabrics were measured by a capillary flow porometry. The obtained results suggest that needle-punching method can be used to produce highly porous microstructures with an interconnected pore network.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Synthesis of Novel Plasticizers Based on Poly(ε-caprolactone) and a Consideration of Their Influence on Nitroglycerine Migration in Double Base Solid Propellants
Autorzy:: Abrishami, F.
Zarei, A.
Karegar, M.
Tematy:: nitroglycerine
double base propellants
migration
ε-caprolactone
plasticizer; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/358389.pdf Link otwiera się w nowym oknie
Opis:: The presence of nitroglycerine (NG) in double base propellants and its subsequent migration from the propellant towards the inhibitor has always been an important issue. This problem may be considerably reduced by exploiting the concept of the introduction of electron donor sites to the propellant formulation. Plasticizers based on ε-caprolactone (ε-CL) were synthesized and characterized, and their activities for absorbing nitroglycerine were investigated. According to the results, the order of NG absorption is: PCL-(OH)2 < PCL-(OH)3< PCL-(OH)4< H-PCL. The observed differences in the properties of the plasticizers is discussed in terms of structural considerations. The data also showed that the hyperbranched poly(ε-caprolactone) (H-PCL) has the greatest effect in decreasing NG migration. Furthermore, the activity of these plasticizers in decreasing NG migration was also investigated by IR analysis.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: New homogeneous blends of dibutyrylchitin and aliphatic polyesters
Autorzy:: Sobecki, Paweł P.
Pabin-Szafko, Barbara
Tematy:: biodegradable polyester
blends
dibutyrylchitin
poly(ε-caprolactone)
polylactide; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Powiązania:: https://bibliotekanauki.pl/articles/1035501.pdf Link otwiera się w nowym oknie
Opis:: The results of physical modification of dibutyrylchitin (DBCH) for the purpose of improvement of its imperfect mechanical properties are presented. Thus, the novel blends of DBCH and biodegradable aliphatic copolymer derived from ε-caprolactone, L-lactide and glycolide (PCLG) in various proportions were prepared and examined. DBCH/PCLG blends with PCLG contents between 6 - 50 wt% were successfully prepared in film form with the thickness in the range of 10 - 500 μm. The morphology of these blend films was studied by means of differential scanning calorimetry and infrared spectroscopy. DBCH was found to be able to form miscible blends with PCLG polyester within the whole composition range studied; revealed that blends were composed of an amorphous homogeneous phase as evidenced by the presence of a single glass transition temperature, that to decrease with increasing PCLG content in materials. Furthermore, physical modification of DBCH with polyester resulted in superior mechanical properties – the blended materials exhibited a much higher toughness and elongation at break as well as a lower value of elasticity modulus.
Dostawca treści:: Biblioteka Nauki

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