Browsing by Author "Chvojka Jiří"
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- Item3d Composite Material Intended Particularly as Biologically Degradable Replacement of Cartilage(2014) Chvojka Jiří; Košťáková Eva; Lukáš David; Šafka Jiří
- Item3d Micro-nano Fibrous Scaffold Prepared by Meltblow N in Combination with Electrospinning for the Bone Tissue Engineering(TANGER Ltd, 2014) Erben Jakub; Blažková Lenka; Košťáková Eva; Lukáš David; Prosecká Eva; Novák Ondřej; Mikeš Petr; Havlíček Jiří; Jenčová Věra; Pilařová Kateřina; Sanetrník Filip; Chvojka Jiří
- Item3D-Printed Magnetic Stirring Cages for Semidispersive Extraction of Bisphenols from Water Using Polymer Micro- and Nanofibers(ACS Publications, 2020) Šrámková Ivana; Horstkotte Burkhard; Erben Jakub; Chvojka Jiří; Švec František; Solich Petr; Šatínský Dalibor
- ItemA comparison study of nanofiber, microfiber, and new composite nano/microfiber polymers used as sorbents for on-line solid phase extraction in chromatography system(Elsevier Ltd., 2018) Hakova Martina; Chocholousova Havlikova Lucie; Chvojka Jiří; Erben Jakub; Solich Petr; Švec FrantišekThree different approaches has been used to obtain nano/micro fibers and their diversity and extraction properties were examined. The effect of their structure on stability in an ultra-high-performance liquid chromatography (UHPLC) system during on-line SPE procedure was monitored. Five types of various nano/micro fiber polymers were used as sorbents: polyamide 6 nanofibers, polyvinylidene difluoride nanofibers, polyethylene microfibers, and two new polycaprolactone microfiber/nanofiber and polycaprolactone microfibers/polyvinylidene difluoride nanofibers composite polymers. The fiber polymers were filled in a cartridge directly connected to the UHPLC system and tested. For each polymer, the optimal conditions of the on-line extraction were found and potential applicability on real samples was tested. The determination of ochratoxin A (OTA) in beer matrix was chosen as a case study. Relevant factors such as the mechanical and chemical stability of the nano/microfibers, filling the cartridges, fiber reusability and the possibility and the repeatability of all processes were involved in the proposed study. A new nano/micro composite sorbent consisting of polycaprolactone microfibers/polyvinylidene difluoride nanofibers was chosen as the most suitable sorbent for the on-line extraction of OTA from a beer matrix. The tested validation parameters had the value of intra-day precision lower than 1.48%, linearity in the range from 0.5 to 100 μg L−1 with r2 ≥ 0.9999 for standard and matrix calibration curve, and recovery in the range 99.1–103.9% at five concentration levels. Long-term precision evaluated for 31 analyses over the period of three months did not exceed 2.9% RSD. It confirmed the column reusability and perfect stability of nano/micro composite sorbent in the presence of organic solvents and after repeated injection of a complex beer matrix.
- ItemAC Bubble Electrospinning Technology for Preparation of Nanofibrous Mats(ACSPublications, 2021) Erben Jakub; Kalous Tomáš; Chvojka Jiří
- ItemAlternating Current Electrospinning Method for Preparation of Nanofibrous Materials(2014) Lukáš David; Chvojka Jiří; Pokorný Pavel; Bílek Martin; Kočiš Lubomír; Pejchar Karel; Beran Jaroslav
- ItemArtificial muscle(2015) Lukáš David; Šaman Aleš; Zálešáková Denisa; Chvojka Jiří; Klápšťová Andrea
- ItemBubble Electrospinning Technology for Preparation of Nanofibrous Mats(2017) Erben Jakub; Kalous Tomáš; Chvojka Jiří
- ItemCell Penetration to Nanofibrous Scaffolds(Cell adhesion & migration, 2014) Rampichova Michala; Chvojka Jiří; Amler Evžen; Kofroňová Olga; Prosecká Eva; Buzgo Matej
- ItemCharacterization and preparation of composite scaffolds for biomedical applications(2017) Jirkovec Radek; Erben Jakub; Chvojka Jiří
- ItemThe Combination of Bioprinting with 3D Fibrous Scaffolds Based on Electrospinning and Meltblown Technology(2017) Erben Jakub; Jirkovec Radek; Kovalenko Iaroslav; Chvojka Jiří
- ItemCombination of electrospun nanofibers and surface modified 3D printing for knee cartilage tissue engineering(Technická univerzita v Liberci, 2015) Pelcl Martin; Košťáková Eva; Chvojka Jiří; Horáková Jana; Šafka Jiří; Kříž Kristián; Rampichova Michala; Lachman Martin
- ItemCombination of nanofibres and microfibres in 3D scaffold for bone or cartilage regeneration.(2015) Košťáková Eva; Erben Jakub; Jenčová Věra; Pilařová Kateřina; Rampichova Michala; Sanetrník Filip; Blažková Lenka; Havlíček Jiří; Novák Ondřej; Mikeš Petr; Chvojka Jiří; Lukáš David
- ItemCombination of Patterned Electrospun Nanofibers and 3D Printing for Knee Cartilage Tissue Engineering(2014) Chvojka Jiří; Šafka Jiří; Pelcl Martin; Kříž Kristián; Pilařová Kateřina; Rampichova Michala; Lachman Martin; Filová Eva; Jenčová Věra; Košťáková Eva
- ItemComparison of the Well Known Spinning And Electrospinning Methods for Polyvinyl Alcohol(FOART, s.r.o., 2016) Blažková Lenka; Horáková Jana; Kalous Tomáš; Pelcl Martin; Strnadová Kateřina; Šaman Aleš; Chvojka Jiří; Novák Patrik; Hlavatá Jana
- ItemComparison study of nanofibers, composite nano/microfiber materials, molecularly imprinted polymers, and core-shell sorbents used for on-line extraction-liquid chromatography of ochratoxins in Tokaj wines(Elsevier, 2021) Kholová Aneta; Lhotská Ivona; Erben Jakub; Chvojka Jiří; Švec František; Šolich Petr; Šatínský Dalibor
- ItemComposite 3D printed scaffold with structured electrospun nanofibers promotes chondrocyte adhesion and infiltration(Informa UK Limited, 2018) Rampichova Michala; Kuželová Košťáková Eva; Filová Eva; Chvojka Jiří; Šafka Jiří; Pelcl Martin; Dankova J; Prosecka Eva; Buzgo Matej; Plencner Martin; Lukáš David; Amler Evžen
- ItemComposite 3D printed scaffold with structured electrospun nanofibers promotes chondrocyte adhesion and infiltration(Taylor&Francis Online, 2018) Rampichova Michala; Kuželová Košťáková Eva; Filová Eva; Chvojka Jiří; Šafka Jiří; Pelcl Martin; Daňková, J.; Prosecka Eva; Buzgo Matej; Plencner Martin; Lukáš David; Amler EvženAdditive manufacturing, also called 3D printing, is an effective method for preparing scaffolds with defined structure and porosity. The disadvantage of the technique is the excessive smoothness of the printed fibers, which does not support cell adhesion. In the present study, a 3D printed scaffold was combined with electrospun classic or structured nanofibers to promote cell adhesion. Structured nanofibers were used to improve the infiltration of cells into the scaffold. Electrospun layers were connected to 3D printed fibers by gluing, thus enabling the fabrication of scaffolds with unlimited thickness. The composite 3D printed/nanofibrous scaffolds were seeded with primary chondrocytes and tested in vitro for cell adhesion, proliferation and differentiation. The experiment showed excellent cell infiltration, viability, and good cell proliferation. On the other hand, partial chondrocyte dedifferentiation was shown. Other materials supporting chondrogenic differentiation will be investigated in future studies.
- ItemComposite Electrospun Fibrous Structures by Different Fiber Generators(TANGER, 2018) Kuželová Košťáková Eva; Chvojka Jiří; Nevyhoštěný Stanislav; Valapková Barbora; Stuchlík Martin; Stuchlík Martin; Grégr Jan
- ItemComposite Nanofibers Made of polycaprolactone-Exoticwoods(Journal of Materials Science and Engineering B, 2014) Klouda Karel; Dobiáš Jaroslav; Mikeš Petr; Chvojka Jiří; Košťáková Eva; Buřičová Hana; Zemanova Eva