Marta Sojka - Academia.edu (original) (raw)

Papers by Marta Sojka

Research paper thumbnail of Stimuli-responsive polyelectrolyte multilayer films and microcapsules

Advances in Colloid and Interface Science

Research paper thumbnail of Properties of POPC/POPE supported lipid bilayers modified with hydrophobic quantum dots on polyelectrolyte cushions

Colloids and Surfaces B: Biointerfaces, 2017

The formation and properties of supported lipid bilayers (SLB) containing hydrophobic nanoparticl... more The formation and properties of supported lipid bilayers (SLB) containing hydrophobic nanoparticles (NP) was studied in relation to underlying cushion obtained from selected polyelectrolyte multilayers. Lipid vesicles were formed from zwitterionic 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) and negatively charged 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine (POPE) in phosphate buffer (PBS). As hydrophobic nanoparticles − quantum dots (QD) with size of 3.8 nm (emission wavelength of 420 nm) were used. Polyelectrolyte multilayers (PEM) were constructed by the sequential, i.e., layer-by-layer (LbL) adsorption of alternately charged polyelectrolytes from their solutions. Liposomes and Liposome-QDs complexes were studied with Transmission Cryo-Electron Microscopy (Cryo-TEM) to verify the quality of vesicles and the position of QD within lipid bilayer. Deposition of liposomes and liposomes with quantum dots on polyelectrolyte films was studied in situ using quartz crystal microbalance with dissipation (QCM-D) technique. The fluorescence emission spectra were analyzed for both: suspension of liposomes with nanoparticles and for supported lipid bilayers containing QD on PEM. It was demonstrated that quantum dots are located in the hydrophobic part of lipid bilayer. Moreover, we proved that such QD-modified liposomes formed supported lipid bilayers and their final structure depended on the type of underlying cushion.

Research paper thumbnail of Structural evolution of supported lipid bilayers intercalated with quantum dots

Journal of Colloid and Interface Science, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Supported lipid bilayers with encapsulated quantum dots (QDs) via liposome fusion: effect of QD size on bilayer formation and structure

Nanoscale, 2018

The formation kinetics and structure of supported lipid bilayers embedded with quantum-dots (QDs)... more The formation kinetics and structure of supported lipid bilayers embedded with quantum-dots (QDs) depend on the QD size.

Research paper thumbnail of Formation and characterization of (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine)/(1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-l-serine) supported lipid bilayers on polyelectrolyte multilayer films

Thin Solid Films, 2015

The report focuses on understanding of the mechanism of formation of supported lipid bilayers (SL... more The report focuses on understanding of the mechanism of formation of supported lipid bilayers (SLBs) by vesicle adsorption and rupture on polyelectrolyte multilayer (PEM) films. The PEM films were constructed by sequential adsorption of positively-poly-L-lysine (PLL) and negatively-poly-L-glutamic acid sodium salt (PGA) charged polyelectrolytes (PEs) on charged surface. The adsorption kinetics of small unilamellar vesicles, prepared from mixtures of phospholipids, zwitterionic unsaturated (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, POPC) and negatively charged unsaturated (1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-L-serine (sodium salt), POPS) was investigated on such PEM polymer cushions, using quartz crystal microbalance with dissipation monitoring (QCM-D). Complementary AFM measurements were performed to verify the morphology of lipid vesicles and isolated bilayer patches on the PEM cushion terminated with positively charged PLL. Properties of solid substrates were characterized with QCM-D and ellipsometry to find information on the layer thickness and water content of these layers. The results suggested that, depending on the number of layers, two pathways of vesicle adsorption may be proposed. We believe that modification of solid surfaces using SLBs is very important for the development of new multifunctional materials for biotechnological applications as cell-membrane models and biosensors and for drug delivery systems.

Research paper thumbnail of Effect of Supporting Polyelectrolyte Multilayers and Deposition Conditions on the Formation of 1-Palmitoyl-2-oleoyl- sn -glycero-3-phosphocholine/1-Palmitoyl-2-oleoyl- sn -glycero-3-phosphoethanolamine Lipid Bilayers

Langmuir, 2015

published as an ASAP article. Note that technical editing may introduce minor changes to the manu... more published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these "Just Accepted" manuscripts. Effect of supporting polyelectrolyte multilayers and deposition conditions on the formation of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine/-palmitoyl-2oleoyl-sn-glycero-3-phosphoethanolamine lipid bilayers

Research paper thumbnail of Electroactive properties of the multilayer films containing Prussian Blue nanoparticles

MATEC Web of Conferences, 2013

In our work we have focused on the incorporation of Prussian Blue nanoparticles (NP) into polyele... more In our work we have focused on the incorporation of Prussian Blue nanoparticles (NP) into polyelectrolyte multilayer films (PEM). The main goal of presented studies was to obtain polymer/nanoparticles films with controlled electroactive properties. The amount and ordering of deposited nanoparticles depended on the adsorption conditions of the underlying polymer anchoring layer. In the case of fully charged polyelectrolyte layer, nanoparticles were distributed uniformly. When anchoring layer was not completely charged, strong aggregation of nanoparticles at the surface was observed, causing diminution of current response of studied nanocomposite films. Thus, the selection of the proper formation conditions of nanocomposite films may influence their properties and it may even enhance their response.

Research paper thumbnail of Stimuli-responsive polyelectrolyte multilayer films and microcapsules

Advances in Colloid and Interface Science

Research paper thumbnail of Properties of POPC/POPE supported lipid bilayers modified with hydrophobic quantum dots on polyelectrolyte cushions

Colloids and Surfaces B: Biointerfaces, 2017

The formation and properties of supported lipid bilayers (SLB) containing hydrophobic nanoparticl... more The formation and properties of supported lipid bilayers (SLB) containing hydrophobic nanoparticles (NP) was studied in relation to underlying cushion obtained from selected polyelectrolyte multilayers. Lipid vesicles were formed from zwitterionic 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) and negatively charged 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine (POPE) in phosphate buffer (PBS). As hydrophobic nanoparticles − quantum dots (QD) with size of 3.8 nm (emission wavelength of 420 nm) were used. Polyelectrolyte multilayers (PEM) were constructed by the sequential, i.e., layer-by-layer (LbL) adsorption of alternately charged polyelectrolytes from their solutions. Liposomes and Liposome-QDs complexes were studied with Transmission Cryo-Electron Microscopy (Cryo-TEM) to verify the quality of vesicles and the position of QD within lipid bilayer. Deposition of liposomes and liposomes with quantum dots on polyelectrolyte films was studied in situ using quartz crystal microbalance with dissipation (QCM-D) technique. The fluorescence emission spectra were analyzed for both: suspension of liposomes with nanoparticles and for supported lipid bilayers containing QD on PEM. It was demonstrated that quantum dots are located in the hydrophobic part of lipid bilayer. Moreover, we proved that such QD-modified liposomes formed supported lipid bilayers and their final structure depended on the type of underlying cushion.

Research paper thumbnail of Structural evolution of supported lipid bilayers intercalated with quantum dots

Journal of Colloid and Interface Science, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Supported lipid bilayers with encapsulated quantum dots (QDs) via liposome fusion: effect of QD size on bilayer formation and structure

Nanoscale, 2018

The formation kinetics and structure of supported lipid bilayers embedded with quantum-dots (QDs)... more The formation kinetics and structure of supported lipid bilayers embedded with quantum-dots (QDs) depend on the QD size.

Research paper thumbnail of Formation and characterization of (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine)/(1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-l-serine) supported lipid bilayers on polyelectrolyte multilayer films

Thin Solid Films, 2015

The report focuses on understanding of the mechanism of formation of supported lipid bilayers (SL... more The report focuses on understanding of the mechanism of formation of supported lipid bilayers (SLBs) by vesicle adsorption and rupture on polyelectrolyte multilayer (PEM) films. The PEM films were constructed by sequential adsorption of positively-poly-L-lysine (PLL) and negatively-poly-L-glutamic acid sodium salt (PGA) charged polyelectrolytes (PEs) on charged surface. The adsorption kinetics of small unilamellar vesicles, prepared from mixtures of phospholipids, zwitterionic unsaturated (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, POPC) and negatively charged unsaturated (1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-L-serine (sodium salt), POPS) was investigated on such PEM polymer cushions, using quartz crystal microbalance with dissipation monitoring (QCM-D). Complementary AFM measurements were performed to verify the morphology of lipid vesicles and isolated bilayer patches on the PEM cushion terminated with positively charged PLL. Properties of solid substrates were characterized with QCM-D and ellipsometry to find information on the layer thickness and water content of these layers. The results suggested that, depending on the number of layers, two pathways of vesicle adsorption may be proposed. We believe that modification of solid surfaces using SLBs is very important for the development of new multifunctional materials for biotechnological applications as cell-membrane models and biosensors and for drug delivery systems.

Research paper thumbnail of Effect of Supporting Polyelectrolyte Multilayers and Deposition Conditions on the Formation of 1-Palmitoyl-2-oleoyl- sn -glycero-3-phosphocholine/1-Palmitoyl-2-oleoyl- sn -glycero-3-phosphoethanolamine Lipid Bilayers

Langmuir, 2015

published as an ASAP article. Note that technical editing may introduce minor changes to the manu... more published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these "Just Accepted" manuscripts. Effect of supporting polyelectrolyte multilayers and deposition conditions on the formation of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine/-palmitoyl-2oleoyl-sn-glycero-3-phosphoethanolamine lipid bilayers

Research paper thumbnail of Electroactive properties of the multilayer films containing Prussian Blue nanoparticles

MATEC Web of Conferences, 2013

In our work we have focused on the incorporation of Prussian Blue nanoparticles (NP) into polyele... more In our work we have focused on the incorporation of Prussian Blue nanoparticles (NP) into polyelectrolyte multilayer films (PEM). The main goal of presented studies was to obtain polymer/nanoparticles films with controlled electroactive properties. The amount and ordering of deposited nanoparticles depended on the adsorption conditions of the underlying polymer anchoring layer. In the case of fully charged polyelectrolyte layer, nanoparticles were distributed uniformly. When anchoring layer was not completely charged, strong aggregation of nanoparticles at the surface was observed, causing diminution of current response of studied nanocomposite films. Thus, the selection of the proper formation conditions of nanocomposite films may influence their properties and it may even enhance their response.