Tomasz Ciach | Warsaw University of Technology (original) (raw)

Papers by Tomasz Ciach

Inżynieria i Aparatura Chemiczna, 2006

ABSTRACT Celem pracy było opracowanie nowatorskiego materiału na bazie poliuretanu pokrytego wars... more ABSTRACT Celem pracy było opracowanie nowatorskiego materiału na bazie poliuretanu pokrytego warstwą ludzkich komórek śródbłonka. Aby upodobnić powierzchnię polimeru do naturalnego środowiska komórek śródbłonka przeprowadzono 3-etapowy proces zakończony trwałym przyłączeniem cząsteczek białka (kolagenu) do powierzchni poliuretanu. Zaproponowana metoda cechuje się prostotą i obiecującą efektywnością. Hodowla komórek śródbłonka wykazała adhezję i wzrost komórek na otrzymanych materiałach.

Chemical and Process Engineering, 2007

Biomaterials advances, 2023

The human body is sometimes in a need of medical assistance through either a medical procedure or... more The human body is sometimes in a need of medical assistance through either a medical procedure or exclusively through the administration of pharmaceuticals. This latter embraces the administration of medicine, receiving vaccines, and the need of particular pharmaceuticals in the case of permanent disorder, such as asthma and diabetes.

Springer eBooks, Aug 14, 2007

Electro HydroDynamic Atomisation (EHDA) disperses a liquid into small, highly charged droplets. W... more Electro HydroDynamic Atomisation (EHDA) disperses a liquid into small, highly charged droplets. We show that this method can be used to produce particles that release a drug at a desired rate. This is done by spraying a solution of biodegradable polymers and an enzyme, which represents the effective drug. The release rate can be varied by modification of the polymer matrix. It is further demonstrated that the enzyme fully retains its functionality in the EHDA process. Practical use of this technique for medicine production requires a scaled-up design, which must be based on an adequate model of the particle flow in the charged droplet spray plume. As a step in this direction, the most important result is a scale-up relation that allows simulations of an experimental spray with millions of particles, using only a few thousand model particles. The experimental spray is examined with a Phase Doppler Particle Analyser (PDPA) setup , and the resulting density and velocity profiles are compared to the numerical results. There is a qualitative agreement between experiment and model.

Colloids and Surfaces B: Biointerfaces, Apr 1, 2021

Nano- and microemulsions have found various applications in pharmaceutical and medical areas both... more Nano- and microemulsions have found various applications in pharmaceutical and medical areas both in research field as well as in applied solutions for drug delivery or diagnostic agents. However, production of stable and bio- / hemocompatible nanoemulsions are still challenging. New group of ionic surfactants have been synthesized with perfluorohexyl- or perfluorooctyl-groups as hydrophobic tail. The CMC and the parametres of the O/W emulsion (the particle size distribution and the zeta-potential) were determined. The influence of the surfactants on in vitro proliferation of human endothelial cell lines HMEC-1, murine fibroblasts L929 and hemolysis were investigated as characteristic for biocompatibility. Three candidates of surfactants were selected for pre-clinical tests on a small animal model (adult Sprague Dawley rats) on the basis of preliminary studies. This allowed to obtain nanoemulsions with narrow droplets size (average droplet diameter 141-147 nm with PDI index 0.059 - 0.065) and showed better stability over time in comparison to the commercially available surfactants. Neither cytotoxic nor hemolytic potential were observed during incubation of obtained fluorosurfactans with model cell lines L929 and HMEC-1 (average cell viability above 85 % after incubation with 1% solutions) and erythrocytes (hemolysis rate below 3.1 % for all 0.5 % solutions). During acute toxicity test on rat model, it was found that all three tested surfactant solutions showed no significant differences in controlled parameters and survival rate with control group (p > 0.05). Presented surfactants are dedicated but not limited to emulsification of organic fluorocompounds.

Inzynieria Chemiczna I Procesowa, 2001

Ceramics International, Dec 1, 2019

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, May 1, 1993

Biomaterials advances, Mar 1, 2023

International Journal of Biological Macromolecules, Dec 1, 2022

Colloids and Surfaces B: Biointerfaces, Nov 1, 2021

Macromolecular Bioscience, Jun 2, 2020

The antimicrobial properties of polycations are strongly affected by the structural features such... more The antimicrobial properties of polycations are strongly affected by the structural features such as the backbone flexibility and topology (isomerism) through the polymer ability to attain proper conformation in interaction with the cell membrane. In this paper, a synthesis and biocidal properties evaluation of ionenes characterized by different backbone topology (isomerism) and flexibility are presented. The findings reveal influence of variation in topology on activity against different microorganisms, and general positive effect of improved flexibility. Furthermore, one of the obtained ionenes displays degradable properties in near physiological environment (phosphate‐buffered saline pH 7.4, 37 °C). The degradation proceeds via Hofmann elimination reaction and the products are not of acidic character. For the first time a new class of degradable ionenes with a high antimicrobial potential is presented.

Progress on Chemistry and Application of Chitin and its Derivatives, Sep 30, 2021

Effective antibacterial coatings are in demand in medicine, especially for urological medical dev... more Effective antibacterial coatings are in demand in medicine, especially for urological medical devices such as catheters and stents. We propose the production method of an antibacterial hydrogel coating on polydimethylsiloxane (PDMS, silicone), a popular surface for medical materials. The coating process consists of the following steps: PDMS surface activation (introduction of hydroxyl groups), silanisation (introduction of amine groups) and application of chitosan/alginate hydrogel with the addition of lysozyme as an antibacterial agent using the layer-by-layer method. We investigated the effect of polyion concentration on the coating mass, swelling ratio and stability. We analysed the adsorption of Micrococcus luteus, Escherichia coli and Proteus rettgeri on a PDMS surface using confocal laser scanning microscopy. The chitosan/alginate hydrogel coating with immobilised lysozyme protected the PDMS surface against adhesion for all three tested bacterial strains.

Chemical Engineering and Processing, Nov 1, 2018

Journal of Biological Engineering, Mar 13, 2023

Background In this study, two types of polyurethane-based cylindrical multilayered grafts with in... more Background In this study, two types of polyurethane-based cylindrical multilayered grafts with internal diameters ≤ 6 mm were produced by the solution blow spinning (SBS) method. The main aim was to create layered-wall prostheses differing in their luminal surface morphology. Changing the SBS process parameters, i.e. working distance, rotational speed, volume, and concentration of the polymer solution allowed to obtain structures with the required morphologies. The first type of prostheses, termed Nano, possessed nanofibrous luminal surface, and the second type, Micro, presented morphologically diverse luminal surface, with both solid and microfibrous areas. Results The results of mechanical tests confirmed that designed prostheses had high flexibility (Young's modulus value of about 2.5 MPa) and good tensile strength (maximum axial load value of about 60 N), which meet the requirements for vascular prostheses. The influence of the luminal surface morphology on platelet adhesion and the attachment of endothelial cells was investigated. Both surfaces did not cause hemolysis in contact with blood, the percentage of platelet-occupied area for Nano and Micro surfaces was comparable to reference polytetrafluoroethylene (PTFE) surface. However, the change in morphology of surface-adhered platelets between Nano and Micro surfaces was visible, which might suggest differences in their activation level. Endothelial coverage after 1, 3, and 7 days of culture on flat samples (2D model) was higher on Nano prostheses as compared with Micro scaffolds. However, this effect was not seen in 3D culture, where cylindrical prostheses were colonized using magnetic seeding method. Conclusions We conclude the produced scaffolds meet the material and mechanical requirements for vascular prostheses. However, changing the morphology without changing the chemical modification of the luminal surface is not sufficient to achieve the appropriate effectiveness of endothelialization in the 3D model.

Cell Biology International, Jan 17, 2019

Inżynieria i Aparatura Chemiczna, 2006

ABSTRACT Celem pracy było opracowanie nowatorskiego materiału na bazie poliuretanu pokrytego wars... more ABSTRACT Celem pracy było opracowanie nowatorskiego materiału na bazie poliuretanu pokrytego warstwą ludzkich komórek śródbłonka. Aby upodobnić powierzchnię polimeru do naturalnego środowiska komórek śródbłonka przeprowadzono 3-etapowy proces zakończony trwałym przyłączeniem cząsteczek białka (kolagenu) do powierzchni poliuretanu. Zaproponowana metoda cechuje się prostotą i obiecującą efektywnością. Hodowla komórek śródbłonka wykazała adhezję i wzrost komórek na otrzymanych materiałach.

Chemical and Process Engineering, 2007

Biomaterials advances, 2023

The human body is sometimes in a need of medical assistance through either a medical procedure or... more The human body is sometimes in a need of medical assistance through either a medical procedure or exclusively through the administration of pharmaceuticals. This latter embraces the administration of medicine, receiving vaccines, and the need of particular pharmaceuticals in the case of permanent disorder, such as asthma and diabetes.

Springer eBooks, Aug 14, 2007

Electro HydroDynamic Atomisation (EHDA) disperses a liquid into small, highly charged droplets. W... more Electro HydroDynamic Atomisation (EHDA) disperses a liquid into small, highly charged droplets. We show that this method can be used to produce particles that release a drug at a desired rate. This is done by spraying a solution of biodegradable polymers and an enzyme, which represents the effective drug. The release rate can be varied by modification of the polymer matrix. It is further demonstrated that the enzyme fully retains its functionality in the EHDA process. Practical use of this technique for medicine production requires a scaled-up design, which must be based on an adequate model of the particle flow in the charged droplet spray plume. As a step in this direction, the most important result is a scale-up relation that allows simulations of an experimental spray with millions of particles, using only a few thousand model particles. The experimental spray is examined with a Phase Doppler Particle Analyser (PDPA) setup , and the resulting density and velocity profiles are compared to the numerical results. There is a qualitative agreement between experiment and model.

Colloids and Surfaces B: Biointerfaces, Apr 1, 2021

Nano- and microemulsions have found various applications in pharmaceutical and medical areas both... more Nano- and microemulsions have found various applications in pharmaceutical and medical areas both in research field as well as in applied solutions for drug delivery or diagnostic agents. However, production of stable and bio- / hemocompatible nanoemulsions are still challenging. New group of ionic surfactants have been synthesized with perfluorohexyl- or perfluorooctyl-groups as hydrophobic tail. The CMC and the parametres of the O/W emulsion (the particle size distribution and the zeta-potential) were determined. The influence of the surfactants on in vitro proliferation of human endothelial cell lines HMEC-1, murine fibroblasts L929 and hemolysis were investigated as characteristic for biocompatibility. Three candidates of surfactants were selected for pre-clinical tests on a small animal model (adult Sprague Dawley rats) on the basis of preliminary studies. This allowed to obtain nanoemulsions with narrow droplets size (average droplet diameter 141-147 nm with PDI index 0.059 - 0.065) and showed better stability over time in comparison to the commercially available surfactants. Neither cytotoxic nor hemolytic potential were observed during incubation of obtained fluorosurfactans with model cell lines L929 and HMEC-1 (average cell viability above 85 % after incubation with 1% solutions) and erythrocytes (hemolysis rate below 3.1 % for all 0.5 % solutions). During acute toxicity test on rat model, it was found that all three tested surfactant solutions showed no significant differences in controlled parameters and survival rate with control group (p > 0.05). Presented surfactants are dedicated but not limited to emulsification of organic fluorocompounds.

Inzynieria Chemiczna I Procesowa, 2001

Ceramics International, Dec 1, 2019

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, May 1, 1993

Biomaterials advances, Mar 1, 2023

International Journal of Biological Macromolecules, Dec 1, 2022

Colloids and Surfaces B: Biointerfaces, Nov 1, 2021

Macromolecular Bioscience, Jun 2, 2020

The antimicrobial properties of polycations are strongly affected by the structural features such... more The antimicrobial properties of polycations are strongly affected by the structural features such as the backbone flexibility and topology (isomerism) through the polymer ability to attain proper conformation in interaction with the cell membrane. In this paper, a synthesis and biocidal properties evaluation of ionenes characterized by different backbone topology (isomerism) and flexibility are presented. The findings reveal influence of variation in topology on activity against different microorganisms, and general positive effect of improved flexibility. Furthermore, one of the obtained ionenes displays degradable properties in near physiological environment (phosphate‐buffered saline pH 7.4, 37 °C). The degradation proceeds via Hofmann elimination reaction and the products are not of acidic character. For the first time a new class of degradable ionenes with a high antimicrobial potential is presented.

Progress on Chemistry and Application of Chitin and its Derivatives, Sep 30, 2021

Effective antibacterial coatings are in demand in medicine, especially for urological medical dev... more Effective antibacterial coatings are in demand in medicine, especially for urological medical devices such as catheters and stents. We propose the production method of an antibacterial hydrogel coating on polydimethylsiloxane (PDMS, silicone), a popular surface for medical materials. The coating process consists of the following steps: PDMS surface activation (introduction of hydroxyl groups), silanisation (introduction of amine groups) and application of chitosan/alginate hydrogel with the addition of lysozyme as an antibacterial agent using the layer-by-layer method. We investigated the effect of polyion concentration on the coating mass, swelling ratio and stability. We analysed the adsorption of Micrococcus luteus, Escherichia coli and Proteus rettgeri on a PDMS surface using confocal laser scanning microscopy. The chitosan/alginate hydrogel coating with immobilised lysozyme protected the PDMS surface against adhesion for all three tested bacterial strains.

Chemical Engineering and Processing, Nov 1, 2018

Journal of Biological Engineering, Mar 13, 2023

Background In this study, two types of polyurethane-based cylindrical multilayered grafts with in... more Background In this study, two types of polyurethane-based cylindrical multilayered grafts with internal diameters ≤ 6 mm were produced by the solution blow spinning (SBS) method. The main aim was to create layered-wall prostheses differing in their luminal surface morphology. Changing the SBS process parameters, i.e. working distance, rotational speed, volume, and concentration of the polymer solution allowed to obtain structures with the required morphologies. The first type of prostheses, termed Nano, possessed nanofibrous luminal surface, and the second type, Micro, presented morphologically diverse luminal surface, with both solid and microfibrous areas. Results The results of mechanical tests confirmed that designed prostheses had high flexibility (Young's modulus value of about 2.5 MPa) and good tensile strength (maximum axial load value of about 60 N), which meet the requirements for vascular prostheses. The influence of the luminal surface morphology on platelet adhesion and the attachment of endothelial cells was investigated. Both surfaces did not cause hemolysis in contact with blood, the percentage of platelet-occupied area for Nano and Micro surfaces was comparable to reference polytetrafluoroethylene (PTFE) surface. However, the change in morphology of surface-adhered platelets between Nano and Micro surfaces was visible, which might suggest differences in their activation level. Endothelial coverage after 1, 3, and 7 days of culture on flat samples (2D model) was higher on Nano prostheses as compared with Micro scaffolds. However, this effect was not seen in 3D culture, where cylindrical prostheses were colonized using magnetic seeding method. Conclusions We conclude the produced scaffolds meet the material and mechanical requirements for vascular prostheses. However, changing the morphology without changing the chemical modification of the luminal surface is not sufficient to achieve the appropriate effectiveness of endothelialization in the 3D model.

Cell Biology International, Jan 17, 2019

Extreme ultraviolet (EUV) surface modification of polytetrafluoroethylene (PTFE) was performed in... more Extreme ultraviolet (EUV) surface modification of polytetrafluoroethylene (PTFE) was performed in order to enhance the degree of biocompatibility. Polymer samples were irradiated by different number of EUV shots using a laser–plasma based EUV source in the presence of nitrogen gas. The physical and chemical properties of EUV modified PTFE samples were studied using Atomic Force Microscopy, X-ray photoelectron spectroscopy and water contact angle (WCA) methods. Pronounced wall type micro and nano-structures appeared on the EUV treated polymer surfaces resulting in increased surface roughness and hydrophobicity. Stronger cell adhesion and good cell morphology were observed on EUV modified surfaces by in-vitro cell culture studies performed using L929 fibroblasts.