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Article ; Online: Corrigendum:

Mikeš, Petr / Brož, Antonín / Sinica, Alla / Asatiani, Nikifor / Bačáková, Lucie

2023 Volume 18, Issue 6

Language	English
Publishing date	2023-10-03
Publishing country	England
Document type	Published Erratum
ZDB-ID	2265222-X
ISSN	1748-605X ; 1748-6041
ISSN (online)	1748-605X
ISSN	1748-6041
DOI	10.1088/1748-605X/acfad9
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Article ; Online: The impact of polymer mixture composition on the properties of electrospun membranes for drug delivery applications.

Švára, Dominik / Filipová, Barbora / Jelínek, Petr / Mikeš, Petr / Kluk, Anna / Šoóš, Miroslav

International journal of pharmaceutics

2023 Volume 647, Page(s) 123548

Abstract: Orally dispersible films (ODFs) prepared by an electrospinning are a novel type of pharmaceutical formulation. This dosage form has the potential to be beneficial for small children and the elderly, who can have problems with administration of classical ... ...

Abstract	Orally dispersible films (ODFs) prepared by an electrospinning are a novel type of pharmaceutical formulation. This dosage form has the potential to be beneficial for small children and the elderly, who can have problems with administration of classical tablets due to the increased risk of choking and difficulty with swallowing. Due to the highly porous nanofiber morphology, the ODFs examined in this study achieve rapid disintegration into drug microparticles when in contact with saliva. The suspension is then easier to swallow. In this study, we focus on the impact of film composition (polymer matrix composition) on the properties of electrospun membranes. In particular, we prepared ODFs composed of a mixture of PEG 100 000 with HPMC E5 and PVP k90 with HPMC E5. We found significant differences in the structure of electrospinned membranes, where samples containing PEG 100 000 and HPMC E5 exhibited much narrower distribution of fibers. Furthermore, nanofibers containing PVP k90 exhibit a faster disintegration rate, while dissolution of the drug was faster in the case of PEG 100 000 containing ODFs. The improvement was caused by both the structure and composition of the membranes.
MeSH term(s)	Child ; Humans ; Aged ; Polymers/chemistry ; Solubility ; Drug Delivery Systems ; Drug Compounding ; Tablets
Chemical Substances	Polymers ; Tablets
Language	English
Publishing date	2023-10-25
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	428962-6
ISSN	1873-3476 ; 0378-5173
ISSN (online)	1873-3476
ISSN	0378-5173
DOI	10.1016/j.ijpharm.2023.123548
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Article ; Online: Silver-loaded poly(vinyl alcohol)/polycaprolactone polymer scaffold as a biocompatible antibacterial system.

Vilamová, Zuzana / Šimonová, Zuzana / Bednář, Jiří / Mikeš, Petr / Cieslar, Miroslav / Svoboda, Ladislav / Dvorský, Richard / Rosenbergová, Kateřina / Kratošová, Gabriela

Scientific reports

2024 Volume 14, Issue 1, Page(s) 11093

Abstract: A chronic nonhealing wound poses a significant risk for infection and subsequent health complications, potentially endangering the patient's well-being. Therefore, effective wound dressings must meet several crucial criteria, including: (1) eliminating ... ...

Abstract	A chronic nonhealing wound poses a significant risk for infection and subsequent health complications, potentially endangering the patient's well-being. Therefore, effective wound dressings must meet several crucial criteria, including: (1) eliminating bacterial pathogen growth within the wound, (2) forming a barrier against airborne microbes, (3) promoting cell proliferation, (4) facilitating tissue repair. In this study, we synthesized 8 ± 3 nm Ag NP with maleic acid and incorporated them into an electrospun polycaprolactone (PCL) matrix with 1.6 and 3.4 µm fiber sizes. The Ag NPs were anchored to the matrix via electrospraying water-soluble poly(vinyl) alcohol (PVA), reducing the average sphere size from 750 to 610 nm in the presence of Ag NPs. Increasing the electrospraying time of Ag NP-treated PVA spheres demonstrated a more pronounced antibacterial effect. The resultant silver-based material exhibited 100% inhibition of gram-negative Escherichia coli and gram-positive Staphylococcus aureus growth within 6 h while showing non-cytotoxic effects on the Vero cell line. We mainly discuss the preparation method aspects of the membrane, its antibacterial properties, and cytotoxicity, suggesting that combining these processes holds promise for various medical applications.
MeSH term(s)	Polyvinyl Alcohol/chemistry ; Polyvinyl Alcohol/pharmacology ; Silver/chemistry ; Silver/pharmacology ; Polyesters/chemistry ; Anti-Bacterial Agents/pharmacology ; Anti-Bacterial Agents/chemistry ; Escherichia coli/drug effects ; Escherichia coli/growth & development ; Staphylococcus aureus/drug effects ; Vero Cells ; Animals ; Chlorocebus aethiops ; Biocompatible Materials/chemistry ; Biocompatible Materials/pharmacology ; Metal Nanoparticles/chemistry ; Tissue Scaffolds/chemistry ; Microbial Sensitivity Tests
Language	English
Publishing date	2024-05-15
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-024-61567-5
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Article: The Mass Production of Lignin Fibres by Means of Needleless Electrospinning

Mikeš, P / Baker, D. A / Uhlin, A / Lukáš, D / Kuželová-Košťáková, E / Vidrich, A / Valtera, J / Kopřivová, B / Asatiani, N / Salmén, L / Tomani, P

Journal of polymers and the environment. 2021 July, v. 29, no. 7

2021

Abstract: Lignin, a cheap renewable natural polymer, can be used as a precursor for the production of carbon fibres, its conversion into which is significantly faster than that of polyacrylonitrile. Lignin can be fractionated in various solvents via dissolution to ...

Abstract	Lignin, a cheap renewable natural polymer, can be used as a precursor for the production of carbon fibres, its conversion into which is significantly faster than that of polyacrylonitrile. Lignin can be fractionated in various solvents via dissolution to decrease its polydispersity. Fractions with a higher molecular weight distribution can then be used in solvent-based spinning technologies such as electrospinning. We selected several solvent systems according to the Hansen solubility theory and subsequently tested them for solubility and electro-spinability. The selected solvent systems were then successfully tested for use in the needleless electrospinning process due to their potential for mass production. The solutions used in the electrospinning process needed high concentrations of lignin, which led to a high degree of viscosity. Therefore, we measured the relaxation times and viskosity for selected solutions, a factor that plays a pivotal role in terms of the production of smooth fibres. Finally, these solutions were tested for electrospinning using alternating current. This technology brings a new possibility in mass production of lignin fibres due to its high productivity and ease of use. Such materials can be used in a number of applications such as batteries, supercapacitors or for the production of composite materials. They provide a cheap and renewable natural polymer source which can easily be transformed into a carbon nanofibrous layer.
Keywords	biopolymers ; carbon ; electrochemical capacitors ; environment ; lignin ; molecular weight ; nanofibers ; polyacrylonitrile ; solubility ; solvents ; viscosity
Language	English
Dates of publication	2021-07
Size	p. 2164-2173.
Publishing place	Springer US
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	2017207-2
ISSN	1572-8919 ; 1572-8900 ; 1566-2543
ISSN (online)	1572-8919 ; 1572-8900
ISSN	1566-2543
DOI	10.1007/s10924-020-02029-7
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: The impact of the lamination pressure on the properties of electrospinned nanofibrous films.

Švára, Dominik / Kopřivová, Barbora / Picek, Tomáš / Mikeš, Petr / Kluk, Anna / Šoóš, Miroslav

European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences

2022 Volume 173, Page(s) 106170

Abstract: The purpose of this work is to explore the preparation of nanofibrous orally dispersible films (ODFs) by needleless electrospinning from the active pharmaceutical ingredient (API) Tadalafil using particles suspended in a solution of polymers and other ... ...

Abstract	The purpose of this work is to explore the preparation of nanofibrous orally dispersible films (ODFs) by needleless electrospinning from the active pharmaceutical ingredient (API) Tadalafil using particles suspended in a solution of polymers and other excipients. The prepared films were characterized by a combination of scanning electron microscopy, mechanical tests, measurements of the disintegration time and dissolution characteristic, X-ray diffraction, and differential scanning calorimetry. Furthermore, we investigated the impact of lamination pressures in the range of 0 to 5 bars combined with films at various relative humidity values on the mechanical properties of the ODF. An increase in lamination pressure resulted in higher Young's modulus values, with the maximum value observed for a sample laminated at a pressure of 5 bar and the maximum stress and strain of the prepared ODF at a lamination pressure of 1.2 bar. Moreover, there was a significant increase in the disintegration time with increase in lamination pressure. The disintegration time ranged from 0.35 s for non-laminated samples to 12 s for samples laminated at a pressure of 5 bar. On the contrary, the lamination pressure did not reveal to have any impact on the dissolution kinetics. These results confirmed that the lamination pressure can improve the processability of ODFs without affecting the API dissolution kinetics.
MeSH term(s)	Calorimetry, Differential Scanning ; Chemistry, Pharmaceutical/methods ; Excipients/chemistry ; Nanofibers ; Solubility
Chemical Substances	Excipients
Language	English
Publishing date	2022-03-31
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1154366-8
ISSN	1879-0720 ; 0928-0987
ISSN (online)	1879-0720
ISSN	0928-0987
DOI	10.1016/j.ejps.2022.106170
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Article: Mechanical and Microstructural Anisotropy of Laser Powder Bed Fusion 316L Stainless Steel.

Pitrmuc, Zdeněk / Šimota, Jan / Beránek, Libor / Mikeš, Petr / Andronov, Vladislav / Sommer, Jiří / Holešovský, František

Materials (Basel, Switzerland)

2022 Volume 15, Issue 2

Abstract: This paper aims at an in-depth and comprehensive analysis of mechanical and microstructural properties of AISI 316L austenitic stainless steel (W. Nr. 1.4404, CL20ES) produced by laser powder bed fusion (LPBF) additive manufacturing (AM) technology. The ... ...

Abstract	This paper aims at an in-depth and comprehensive analysis of mechanical and microstructural properties of AISI 316L austenitic stainless steel (W. Nr. 1.4404, CL20ES) produced by laser powder bed fusion (LPBF) additive manufacturing (AM) technology. The experiment in its first part includes an extensive study of the anisotropy of mechanical and microstructural properties in relation to the built orientation and the direction of loading, which showed significant differences in tensile properties among samples. The second part of the experiment is devoted to the influence of the process parameter focus level (FL) on mechanical properties, where a 48% increase in notched toughness was recorded when the level of laser focus was identical to the level of melting. The FL parameter is not normally considered a process parameter; however, it can be intentionally changed in the service settings of the machine or by incorrect machine repair and maintenance. Evaluation of mechanical and microstructural properties was performed using the tensile test, Charpy impact test, Brinell hardness measurement, microhardness matrix measurement, porosity analysis, scanning electron microscopy (SEM), and optical microscopy. Across the whole spectrum of samples, performed analysis confirmed the high quality of LPBF additive manufactured material, which can be compared with conventionally produced material. A very low level of porosity in the range of 0.036 to 0.103% was found. Microstructural investigation of solution annealed (1070 °C) tensile test samples showed an outstanding tendency to recrystallization, grain polygonization, annealing twins formation, and even distribution of carbides in solid solution.
Language	English
Publishing date	2022-01-12
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma15020551
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Article ; Online: In vitro and in vivo testing of nanofibrous membranes doped with alaptide and L-arginine for wound treatment.

Mikeš, Petr / Brož, Antonín / Sinica, Alla / Asatiani, Nikifor / Bačáková, Lucie

Biomedical materials (Bristol, England)

2020 Volume 15, Issue 6, Page(s) 65023

Abstract: We have prepared a candidate biocompatible construct for skin wound healing based on electrospun polycaprolactone (PCL) nanofibrous membranes. The membrane material was loaded either with L-arginine or with alaptide, or with a mixture of both bioactive ... ...

Abstract	We have prepared a candidate biocompatible construct for skin wound healing based on electrospun polycaprolactone (PCL) nanofibrous membranes. The membrane material was loaded either with L-arginine or with alaptide, or with a mixture of both bioactive components. Alaptide is a spirocyclic synthetic dipeptide, an analogue of melanocyte-stimulating hormone release-inhibiting factor. L-arginine is an amino acid with a basic guanidine side chain. It is a direct precursor of nitric oxide, which plays a pivotal role in skin repair. The presence and the distribution of the additives were proved with high-performance liquid chromatography, Fourier-transform infrared spectroscopy and Raman spectroscopy. The influence of L-arginine and alaptide on the morphology of the membrane was characterized using scanning electron microscopy. No statistically significant correlation between fiber diameter and drug concentration was observed. The membranes were then tested in vitro for their cytotoxicity, using primary human dermal fibroblasts, in order to obtain the optimal concentrations of the additives for in vivo tests in a rat model. The membranes with the highest concentration of L-arginine (10 wt. %) proved to be cytotoxic. The membranes with alaptide in concentrations from 0.1 to 2.5 wt.%, and with the other L-arginine concentrations (1 and 5 wt.%), did not show high toxicity. In addition, there was no observed improvement in cell proliferation on the membranes. The in vivo experiments revealed that membranes with 1.5 wt.% of alaptide or with 1.5 wt.% of alaptide in combination with 5 wt.% of L-arginine markedly accelerated the healing of skin incisions, and particularly the healing of skin burns, i.e. wounds of relatively large extent. These results indicate that our newly-developed nanofibrous membranes are promising for treating wounds with large damaged areas, where a supporting material is needed.
MeSH term(s)	Animals ; Arginine/chemistry ; Biocompatible Materials/chemistry ; Cell Proliferation ; Chromatography, High Pressure Liquid ; Drug Delivery Systems ; Electrochemistry ; Electrodes ; Female ; Fibroblasts/drug effects ; Humans ; In Vitro Techniques ; Materials Testing ; Microscopy, Fluorescence ; Nanofibers/chemistry ; Neuropeptides/chemistry ; Peptides/chemistry ; Peptides, Cyclic/chemistry ; Rats ; Rats, Wistar ; Skin/pathology ; Spectroscopy, Fourier Transform Infrared ; Spectrum Analysis, Raman ; Tissue Engineering/methods ; Tissue Scaffolds/chemistry ; Wound Healing/drug effects
Chemical Substances	Biocompatible Materials ; Neuropeptides ; Peptides ; Peptides, Cyclic ; cyclo(alanine-(1-amino-1-cyclopentane)carbonyl) (90058-29-0) ; Arginine (94ZLA3W45F)
Language	English
Publishing date	2020-11-26
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2265222-X
ISSN	1748-605X ; 1748-6041
ISSN (online)	1748-605X
ISSN	1748-6041
DOI	10.1088/1748-605X/ab950f
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Article: An Assessment of Blood Vessel Remodeling of Nanofibrous Poly(ε-Caprolactone) Vascular Grafts in a Rat Animal Model.

Horakova, Jana / Blassova, Tereza / Tonar, Zbynek / McCarthy, Connor / Strnadova, Katerina / Lukas, David / Mikes, Petr / Bowen, Patrick / Guillory, Roger / Frost, Megan / Goldman, Jeremy

Journal of functional biomaterials

2023 Volume 14, Issue 2

Abstract: The development of an ideal vascular prosthesis represents an important challenge in terms of the treatment of cardiovascular diseases with respect to which new materials are being considered that have produced promising results following testing in ... ...

Abstract	The development of an ideal vascular prosthesis represents an important challenge in terms of the treatment of cardiovascular diseases with respect to which new materials are being considered that have produced promising results following testing in animal models. This study focuses on nanofibrous polycaprolactone-based grafts assessed by means of histological techniques 10 days and 6 months following suturing as a replacement for the rat aorta. A novel stereological approach for the assessment of cellular distribution within the graft thickness was developed. The cellularization of the thickness of the graft was found to be homogeneous after 10 days and to have changed after 6 months, at which time the majority of cells was discovered in the inner layer where the regeneration of the vessel wall was found to have occurred. Six months following implantation, the endothelialization of the graft lumen was complete, and no
Language	English
Publishing date	2023-02-03
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2648525-4
ISSN	2079-4983
ISSN	2079-4983
DOI	10.3390/jfb14020088
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Article ; Online: The effect of ethylene oxide sterilization on electrospun vascular grafts made from biodegradable polyesters.

Horakova, J / Mikes, P / Saman, A / Jencova, V / Klapstova, A / Svarcova, T / Ackermann, M / Novotny, V / Suchy, T / Lukas, D

Materials science & engineering. C, Materials for biological applications

2018 Volume 92, Page(s) 132–142

Abstract: The study describes the detailed examination of the effect of ethylene oxide sterilization on electrospun scaffolds constructed from biodegradable polyesters. Different fibrous layers fabricated from polycaprolactone (PCL) and a copolymer consisting of ... ...

Abstract	The study describes the detailed examination of the effect of ethylene oxide sterilization on electrospun scaffolds constructed from biodegradable polyesters. Different fibrous layers fabricated from polycaprolactone (PCL) and a copolymer consisting of polylactide and polycaprolactone (PLCL) were investigated for the determination of their mechanical properties, degradation rates and interaction with fibroblasts. It was discovered that the sterilization procedure influenced the mechanical properties of the electrospun PLCL copolymer scaffold to the greatest extent. No effect of ethylene oxide sterilization on degradation behavior was observed. However, a delayed fibroblast proliferation rate was noticed with concern to the ethylene oxide sterilized samples compared to the ethanol sterilization of the materials.
MeSH term(s)	Animals ; Biocompatible Materials/chemistry ; Biocompatible Materials/metabolism ; Biocompatible Materials/pharmacology ; Blood Vessel Prosthesis ; Cell Line ; Cell Survival/drug effects ; Elastic Modulus ; Ethylene Oxide/chemistry ; Ethylene Oxide/pharmacology ; Mice ; Microscopy, Electron, Scanning ; Nanofibers/chemistry ; Polyesters/chemistry ; Polyesters/metabolism ; Sterilization ; Tensile Strength
Chemical Substances	Biocompatible Materials ; Polyesters ; polycaprolactone (24980-41-4) ; poly(lactide) (459TN2L5F5) ; Ethylene Oxide (JJH7GNN18P)
Language	English
Publishing date	2018-06-27
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	2012160-X
ISSN	1873-0191 ; 0928-4931
ISSN (online)	1873-0191
ISSN	0928-4931
DOI	10.1016/j.msec.2018.06.041
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Article ; Online: Ag-AgCl Nanoparticles Fixation on Electrospun PVA Fibres: Technological Concept and Progress.

Vilamová, Zuzana / Konvičková, Zuzana / Mikeš, Petr / Holišová, Veronika / Mančík, Pavel / Dobročka, Edmund / Kratošová, Gabriela / Seidlerová, Jana

Scientific reports

2019 Volume 9, Issue 1, Page(s) 15520

Abstract: Polymer-metal based material with unique 3D structure is an attractive substrate for the development of biomedical applications. A novel preparation of the composite from polymer fibres and silver nanoparticles has been designed through: (1) preparation ... ...

Abstract	Polymer-metal based material with unique 3D structure is an attractive substrate for the development of biomedical applications. A novel preparation of the composite from polymer fibres and silver nanoparticles has been designed through: (1) preparation of silver nanoparticles by phytosynthesis and (2) incorporation of these nanoparticles in a fibrous membrane prepared by electrospinning. The nanoparticle biosynthesis was performed in a pure environmental-friendly, easy, static, bottom-up in vitro regime using Tilia sp. leachate. TEM and XRD depict the formation, stabilisation and encapsulation of crystalline silver (14 ± 9 nm) nanoparticles (NPs) in one simple step with low tendency to aggregate. We achieved successful incorporation in the uniform electrospun 221 ± 24 nm poly(vinylalcohol) fibres, and this confirms the possibility of its use in the biomedical field. Both SEM with EDX and TEM analysis determined fibre uniformity with the presence of silver NPs, and ICP-AES confirmed the relatively similar metal concentration throughout the triplicate measurement of fibre structures on the 2 × 2 cm area in the following manner: 0.303 ± 0.018 wt. %, 0.282 ± 0.017 wt. %, and 0.281 ± 0.017 wt. %. Our hypothesis is based on previously verified preparation of active silver NPs and the easily prepared PVA electrospun fibres which act as a water soluble matrix. The simple methodology of incorporating biosynthetically prepared NPs in the PVA fibers highlights the effectiveness of this material, with simple release from water-soluble PVA and final activation of the prepared NPs.
Language	English
Publishing date	2019-10-29
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-019-51642-7
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