1
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Lackner F, Šurina P, Fink J, Kotzbeck P, Kolb D, Stana J, Grab M, Hagl C, Tsilimparis N, Mohan T, Stana Kleinschek K, Kargl R. 4-Axis 3D-Printed Tubular Biomaterials Imitating the Anisotropic Nanofiber Orientation of Porcine Aortae. Adv Healthc Mater 2024; 13:e2302348. [PMID: 37807640 DOI: 10.1002/adhm.202302348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 09/16/2023] [Indexed: 10/10/2023]
Abstract
Many of the peculiar properties of the vasculature are related to the arrangement of anisotropic proteinaceous fibers in vessel walls. Understanding and imitating these arrangements can potentially lead to new therapies for cardiovascular diseases. These can be pre-surgical planning, for which patient-specific ex vivo anatomical models for endograft testing are of interest. Alternatively, therapies can be based on tissue engineering, for which degradable in vitro cell growth substrates are used to culture replacement parts. In both cases, materials are desirable that imitate the biophysical properties of vessels, including their tubular shapes and compliance. This work contributes to these demands by offering methods for the manufacturing of anisotropic 3D-printed nanofibrous tubular structures that have similar biophysical properties as porcine aortae, that are biocompatible, and that allow for controlled nutrient diffusion. Tubes of various sizes with axial, radial, or alternating nanofiber orientation along the blood flow direction are manufactured by a customized method. Blood pressure-resistant, compliant, stable, and cell culture-compatible structures are obtained, that can be degraded in vitro on demand. It is suggested that these healthcare materials can contribute to the next generation of cardiovascular therapies of ex vivo pre-surgical planning or in vitro cell culture.
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Affiliation(s)
- Florian Lackner
- Institute for Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria
| | - Paola Šurina
- Institute for Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria
| | - Julia Fink
- COREMED - Centre of Regenerative and Precision Medicine, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Neue Stiftingtalstraße 2, 8010, Graz, Austria
- Research Unit for Tissue Regeneration, Repair and Reconstruction, Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, Auenbruggerplatz 29/4, 8036, Graz, Austria
| | - Petra Kotzbeck
- COREMED - Centre of Regenerative and Precision Medicine, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Neue Stiftingtalstraße 2, 8010, Graz, Austria
- Research Unit for Tissue Regeneration, Repair and Reconstruction, Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, Auenbruggerplatz 29/4, 8036, Graz, Austria
| | - Dagmar Kolb
- Core Unit Ultrastructure Analysis, Medical University Graz, Stiftingtalstraße 6/II, 8010, Graz, Austria
- Gottfried Schatz Research Center for Cell Signaling Metabolism and Aging, Medical University Graz, Stiftingtalstraße 6, 8010, Graz, Austria
| | - Jan Stana
- Department of Vascular Surgery, Ludwig Maximilian University Munich, Marchioninistraße 15, 81377, Munich, Germany
| | - Maximilian Grab
- Department of Cardiac Surgery, Ludwig Maximilian University Munich, Marchioninistraße 15, 81377, Munich, Germany
| | - Christian Hagl
- Department of Cardiac Surgery, Ludwig Maximilian University Munich, Marchioninistraße 15, 81377, Munich, Germany
| | - Nikolaos Tsilimparis
- Department of Vascular Surgery, Ludwig Maximilian University Munich, Marchioninistraße 15, 81377, Munich, Germany
| | - Tamilselvan Mohan
- Institute for Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria
- Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 16, Maribor, 2000, Slovenia
| | - Karin Stana Kleinschek
- Institute for Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria
| | - Rupert Kargl
- Institute for Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria
- Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 16, Maribor, 2000, Slovenia
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2
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Dobaj Štiglic A, Lackner F, Nagaraj C, Beaumont M, Bračič M, Duarte I, Kononenko V, Drobne D, Madhan B, Finšgar M, Kargl R, Stana Kleinschek K, Mohan T. 3D-Printed Collagen-Nanocellulose Hybrid Bioscaffolds with Tailored Properties for Tissue Engineering Applications. ACS Appl Bio Mater 2023; 6:5596-5608. [PMID: 38050684 PMCID: PMC10731651 DOI: 10.1021/acsabm.3c00767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 11/16/2023] [Accepted: 11/19/2023] [Indexed: 12/06/2023]
Abstract
Hybrid collagen (Coll) bioscaffolds have emerged as a promising solution for tissue engineering (TE) and regenerative medicine. These innovative bioscaffolds combine the beneficial properties of Coll, an important structural protein of the extracellular matrix, with various other biomaterials to create platforms for long-term cell growth and tissue formation. The integration or cross-linking of Coll with other biomaterials increases mechanical strength and stability and introduces tailored biochemical and physical factors that mimic the natural tissue microenvironment. This work reports on the fabrication of chemically cross-linked hybrid bioscaffolds with enhanced properties from the combination of Coll, nanofibrillated cellulose (NFC), carboxymethylcellulose (CMC), and citric acid (CA). The bioscaffolds were prepared by 3D printing ink containing Coll-NFC-CMC-CA followed by freeze-drying, dehydrothermal treatment, and neutralization. Cross-linking through the formation of ester bonds between the polymers and CA in the bioscaffolds was achieved by exposing the bioscaffolds to elevated temperatures in the dry state. The morphology, pores/porosity, chemical composition, structure, thermal behavior, swelling, degradation, and mechanical properties of the bioscaffolds in the dry and wet states were investigated as a function of Coll concentration. The bioscaffolds showed no cytotoxicity to MG-63 human bone osteosarcoma cells as tested by different assays measuring different end points. Overall, the presented hybrid Coll bioscaffolds offer a unique combination of biocompatibility, stability, and structural support, making them valuable tools for TE.
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Affiliation(s)
- Andreja Dobaj Štiglic
- Faculty
of Mechanical Engineering, Laboratory for Characterization and Processing
of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
- Faculty
of Chemistry and Chemical Engineering, Laboratory for Analytical Chemistry
and Industrial Analysis, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Florian Lackner
- Institute
of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Chandran Nagaraj
- Ludwig
Boltzmann Institute for Lung Vascular Research, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Marco Beaumont
- Department
of Chemistry, Institute of Chemistry o Renewable Resources, University of Natural Resources and Life Sciences
Vienna (BOKU), A-3430 Tulln, Austria
| | - Matej Bračič
- Faculty
of Mechanical Engineering, Laboratory for Characterization and Processing
of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Isabel Duarte
- Department
of Mechanical Engineering, Centre for Mechanical Technology and Automation
(TEMA), Intelligent Systems Associate Laboratory (LASI), University of Aveiro, 3810-193 Aveiro, Portugal
| | - Veno Kononenko
- Department
of Biology, Biotechnical Faculty, Večna pot 111, 1000 Ljubljana, Slovenia
| | - Damjana Drobne
- Department
of Biology, Biotechnical Faculty, Večna pot 111, 1000 Ljubljana, Slovenia
| | - Balaraman Madhan
- CSIR-Central
Leather Research Institute, Chennai 600 020, Tamil Nadu, India
| | - Matjaž Finšgar
- Faculty
of Chemistry and Chemical Engineering, Laboratory for Analytical Chemistry
and Industrial Analysis, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Rupert Kargl
- Faculty
of Mechanical Engineering, Laboratory for Characterization and Processing
of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
- Institute
of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Karin Stana Kleinschek
- Institute
of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
- Institute
of Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska cesta 46, 2000 Maribor, Slovenia
| | - Tamilselvan Mohan
- Faculty
of Mechanical Engineering, Laboratory for Characterization and Processing
of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
- Institute
of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
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3
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Waite S, Tor PC, Mohan T, Davidson D, Hussain S, Dong V, Loo CK, Martin DM. The utility of the Sydney Melancholia Prototype Index (SMPI) for predicting response to electroconvulsive therapy in depression: A CARE Network study. J Psychiatr Res 2022; 155:180-185. [PMID: 36054966 DOI: 10.1016/j.jpsychires.2022.08.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 08/03/2022] [Accepted: 08/15/2022] [Indexed: 11/16/2022]
Abstract
An enhanced understanding of clinical predictors of positive ECT outcome could assist with the decision to prescribe ECT for select patients. Reliable predictors of ECT response such as psychotic symptoms and age have been identified, however, studies of melancholia and ECT response have been inconsistent. The Sydney Melancholia Prototype Index (SMPI) is a clinical measure designed to differentiate melancholic and non-melancholic depression. This study aimed to investigate whether melancholic depression (as measured by the clinician rated version of the SMPI) predicted a better response to ECT than non-melancholic depression. The study included data collated from four participating sites in the Clinical Alliance for ECT and Related treatments (CARE) network. The primary outcome was response (>50% improvement) on the Montgomery Asberg Depression Rating Scale (MADRS) and the secondary outcome was raw change in MADRS score. Of the 329 depressed patients included in the study, 81% had melancholic features and 76% met criteria for clinical response. SMPI defined melancholia was associated with older age, higher pre-treatment mood scores and presence of psychosis. Melancholia as defined by the SMPI, however, did not significantly predict either clinical response or overall mood improvement with ECT in multivariate analyses. Instead, older age, greater pre-treatment depression severity and the use of bifrontal compared to right unilateral ultrabrief ECT were significant predictors of mood improvement. Path analysis showed that higher pre-treatment mood score and older age were independently associated with mood improvement with ECT.
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Affiliation(s)
- S Waite
- The Queen Elizabeth Hospital, South Australia, Australia
| | - P C Tor
- Institute of Mental Health, Singapore
| | - T Mohan
- Flinders Medical Centre, South Australia, Australia
| | - D Davidson
- Flinders Medical Centre, South Australia, Australia
| | - S Hussain
- Sir Charles Gairdner Hospital, North Metro Health Service, Western Australia, Australia; Medical School, Faculty of Health and Medical Sciences, The University of Western Australia, Australia; Section of ECT and Neurostimulation, Royal Australian and New Zealand College of Psychiatrists, Australia
| | - V Dong
- Discipline of Psychiatry and Mental Health, University of New South Wales, Sydney, NSW, Australia; Black Dog Institute, Sydney, NSW, Australia
| | - C K Loo
- Discipline of Psychiatry and Mental Health, University of New South Wales, Sydney, NSW, Australia; Black Dog Institute, Sydney, NSW, Australia
| | - D M Martin
- Discipline of Psychiatry and Mental Health, University of New South Wales, Sydney, NSW, Australia; Black Dog Institute, Sydney, NSW, Australia.
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4
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Mohan T, Kleinschek KS, Kargl R. Polysaccharide peptide conjugates: Chemistry, properties and applications. Carbohydr Polym 2022; 280:118875. [PMID: 35027118 DOI: 10.1016/j.carbpol.2021.118875] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Revised: 10/25/2021] [Accepted: 11/05/2021] [Indexed: 11/02/2022]
Abstract
The intention of this publication is to give an overview on research related to conjugates of polysaccharides and peptides. Dextran, chitosan, and alginate were selected, to cover four of the most often encountered functional groups known to be present in polysaccharides. These groups are the hydroxyl, the amine, the carboxyl, and the acetal functionality. A collection of the commonly used chemical reactions for conjugation is provided. Conjugation results into distinct properties compared to the parent polysaccharide, and a number of these characteristics are highlighted. This review aims at demonstrating the applicability of said conjugates with a strong emphasis on biomedical applications, drug delivery, biosensing, and tissue engineering. Some suggestions are made for more rigorous chemistries and analytics that could be investigated. Finally, an outlook is given into which direction the field could be developed further. We hope that this survey provides the reader with a comprehensive summary and contributes to the progress of works that aim at synthetically combining two of the main building blocks of life into supramolecular structures with unprecedented biological response.
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Affiliation(s)
- Tamilselvan Mohan
- Institute for Chemistry and Technology of Biobased Systems (IBIOSYS), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Karin Stana Kleinschek
- Institute for Chemistry and Technology of Biobased Systems (IBIOSYS), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Rupert Kargl
- Institute for Chemistry and Technology of Biobased Systems (IBIOSYS), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; Institute for Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia.
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Reishofer D, Resel R, Sattelkow J, Fischer WJ, Niegelhell K, Mohan T, Kleinschek KS, Amenitsch H, Plank H, Tammelin T, Kontturi E, Spirk S. Humidity Response of Cellulose Thin Films. Biomacromolecules 2022; 23:1148-1157. [PMID: 35225593 PMCID: PMC8924868 DOI: 10.1021/acs.biomac.1c01446] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Cellulose–water
interactions are crucial to understand biological
processes as well as to develop tailor made cellulose-based products.
However, the main challenge to study these interactions is the diversity
of natural cellulose fibers and alterations in their supramolecular
structure. Here, we study the humidity response of different, well-defined,
ultrathin cellulose films as a function of industrially relevant treatments
using different techniques. As treatments, drying at elevated temperature,
swelling, and swelling followed by drying at elevated temperatures
were chosen. The cellulose films were prepared by spin coating a soluble
cellulose derivative, trimethylsilyl cellulose, onto solid substrates
followed by conversion to cellulose by HCl vapor. For the highest
investigated humidity levels (97%), the layer thickness increased
by ca. 40% corresponding to the incorporation of 3.6 molecules of
water per anhydroglucose unit (AGU), independent of the cellulose
source used. The aforementioned treatments affected this ratio significantly
with drying being the most notable procedure (2.0 and 2.6 molecules
per AGU). The alterations were investigated in real time with X-ray
reflectivity and quartz crystal microbalance with dissipation, equipped
with a humidity module to obtain information about changes in the
thickness, roughness, and electron density of the films and qualitatively
confirmed using grazing incidence small angle X-ray scattering measurements
using synchrotron irradiation.
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Affiliation(s)
- David Reishofer
- Institute of Bioproducts and Paper Technology, Graz University of Technology, Inffeldgasse 23, Graz 8010, Austria
| | - Roland Resel
- Institute for Solid State Physics, Graz University of Technology, Petersgasse 16, Graz 8010, Austria
| | - Jürgen Sattelkow
- Institute for Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, Graz 8010, Austria
| | - Wolfgang J Fischer
- Institute of Bioproducts and Paper Technology, Graz University of Technology, Inffeldgasse 23, Graz 8010, Austria
| | - Katrin Niegelhell
- Institute of Bioproducts and Paper Technology, Graz University of Technology, Inffeldgasse 23, Graz 8010, Austria
| | - Tamilselvan Mohan
- Institute of Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, Graz 8010, Austria
| | - Karin Stana Kleinschek
- Institute of Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, Graz 8010, Austria
| | - Heinz Amenitsch
- Institute for Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9, Graz 8010, Austria
| | - Harald Plank
- Institute for Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, Graz 8010, Austria
| | - Tekla Tammelin
- High Performance Fibre Products, VTT Technical Research Center of Finland Ltd, Espoo FI-02044 VTT, Finland
| | - Eero Kontturi
- Department of Bioproducts and Biosystems, School of Chemical Technology, Aalto University, Espoo 02150, Finland
| | - Stefan Spirk
- Institute of Bioproducts and Paper Technology, Graz University of Technology, Inffeldgasse 23, Graz 8010, Austria
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Mohan T, Ajdnik U, Nagaraj C, Lackner F, Dobaj Štiglic A, Palani T, Amornkitbamrung L, Gradišnik L, Maver U, Kargl R, Stana Kleinschek K. One-Step Fabrication of Hollow Spherical Cellulose Beads: Application in pH-Responsive Therapeutic Delivery. ACS Appl Mater Interfaces 2022; 14:3726-3739. [PMID: 35014252 PMCID: PMC8796171 DOI: 10.1021/acsami.1c19577] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 12/29/2021] [Indexed: 05/16/2023]
Abstract
The path to greater sustainability and the development of polymeric drug delivery systems requires innovative approaches. The adaptation and use of biobased materials for applications such as targeted therapeutic delivery is, therefore, in high demand. A crucial part of this relates to the development of porous and hollow structures that are biocompatible, pH-responsive, deliver active substances, and contribute to pain relief, wound healing, tissue regeneration, and so forth. In this study, we developed a facile single-step and water-based method for the fabrication of hollow spherical cellulose beads for targeted drug release in response to external pH stimuli. Through base-catalyzed deprotection, hydrophobic solid and spherical cellulose acetate beads are transformed into hydrophilic cellulose structures with a hollow interior (wall thickness: 150 μm and inner diameter: 650 μm) by a stepwise increment of temperature and treatment time. Besides the pH-responsive fluid uptake properties, the hollow cellulose structures exhibit a maximum encapsulation efficiency of 20-85% diclofenac (DCF), a nonsteroidal anti-inflammatory drug, used commonly to treat pain and inflammatory diseases. The maximum amount of DCF released in vitro increased from 20 to 100% when the pH of the release medium increased from pH 1.2 to 7.4. As for the DCF release patterns and kinetic models at specific pH values, the release showed a diffusion- and swelling-controlled profile, effortlessly fine-tuned by external environmental pH stimuli. Overall, we show that the modified beads exhibit excellent characteristics for transport across the gastrointestinal tract and enhance the bioavailability of the drug. Their therapeutic efficacy and biocompatibility are also evident from the studies on human fibroblast cells. We anticipate that this platform could support and inspire the development of novel sustainable and effective polysaccharide-based delivery systems.
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Affiliation(s)
- Tamilselvan Mohan
- Institute
for Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Urban Ajdnik
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Chandran Nagaraj
- Ludwig
Boltzmann Institute for Lung Vascular Research, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Florian Lackner
- Institute
for Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Andreja Dobaj Štiglic
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Thirvengadam Palani
- School
of Chemistry and Chemical Engineering and State Key Laboratory of
Metal Matrix Composites, Shanghai Jiao Tong
University, 800 Dongchuan
Road, Shanghai 200240, China
| | - Lunjakorn Amornkitbamrung
- Faculty
of Engineering, Department of Chemical Engineering Research Unit in
Polymeric Materials for Medical Practice Devices, Chulalongkorn University, 254 Phayathai Rd, Bangkok 10330, Thailand
| | - Lidija Gradišnik
- Faculty of
Medicine, Department of Pharmacology, University
of Maribor, Taborska
ulica 8, 2000 Maribor, Slovenia
| | - Uroš Maver
- Faculty of
Medicine, Department of Pharmacology, University
of Maribor, Taborska
ulica 8, 2000 Maribor, Slovenia
| | - Rupert Kargl
- Institute
for Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Karin Stana Kleinschek
- Institute
for Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
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Abstract
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Stable chitosan thin
films can be promising substrates for creating
nanometric peptide-bound polyglucosamine layers. Those are of scientific
interest since they can have certain structural similarities to bacterial
peptidoglycans. Such films were deposited by spin coating from chitosan
solutions and modified by acetylation and N-protected
amino acids. The masses of deposited materials and their stability
in aqueous solutions at different pH values and water interaction
were determined with a quartz crystal microbalance with dissipation
(QCM-D). The evolution of the surface composition was followed by
X-ray photoelectron (XPS) and attenuated total reflectance infrared
(ATR-IR) spectroscopy. Morphological changes were measured by atomic
force microscopy (AFM), while the surface wettability was monitored
by by static water contact angle measurements. The combination of
the characterization techniques enabled an insight into the surface
chemistry for each treatment step and confirmed the acetylation and
coupling of N-protected glycine peptides. The developed
procedures are seen as first steps toward preparing thin layers of
acetylated chitin, potentially imitating the nanometric peptide substituted
glycan layers found in bacterial cell walls.
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Affiliation(s)
- Tadeja Katan
- Institute of Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Rupert Kargl
- Institute of Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Tamilselvan Mohan
- Institute of Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Tobias Steindorfer
- Institute of Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Miran Mozetič
- Department of Surface Engineering, Jožef Stefan Institute (IJS), Jamova 39, 1000 Ljubljana, Slovenia
| | - Janez Kovač
- Department of Surface Engineering, Jožef Stefan Institute (IJS), Jamova 39, 1000 Ljubljana, Slovenia
| | - Karin Stana Kleinschek
- Institute of Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
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Martin DM, Tor PC, Waite S, Mohan T, Davidson D, Sarma S, Branjerdporn G, Dong V, Kwan E, Loo CK. The utility of the brief ECT cognitive screen (BECS) for early prediction of cognitive adverse effects from ECT: A CARE network study. J Psychiatr Res 2021; 145:250-255. [PMID: 34952375 DOI: 10.1016/j.jpsychires.2021.12.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 11/04/2021] [Accepted: 12/10/2021] [Indexed: 11/15/2022]
Abstract
Although highly effective, electroconvulsive therapy (ECT) often produces cognitive side effects which can be a barrier for patients. Monitoring cognitive side effects during the acute course is therefore recommended to identify patients at increased risk for adverse outcomes. The Brief ECT Cognitive Screen (BECS) is a brief instrument designed to measure emerging cognitive side effects from ECT. The aim of this study was to examine the clinical utility of the BECS for predicting adverse cognitive outcomes in real world clinic settings. The study included data collated from four participating sites in the Clinical Alliance for ECT and Related treatments (CARE) network. The BECS was administered at pre ECT and post 3 or 4 ECT. The primary outcome was a ≥4 point decrease on the Montreal Cognitive Assessment (MoCA) from pretreatment to post ECT. Logistic multiple regression analyses examined the BECS and other relevant clinical and demographic and treatment factors as predictors. The final analysis included 623 patients with diverse indications for ECT including 53.6% with major depression and 33.7% with schizophrenia or schizoaffective disorder. A higher total score on the BECS significantly predicted decline in Total Scores on the MoCA [B = 0.25 (0.08), p = 0.003], though not decline in MoCA Delayed Recall scores (p > 0.1). Other significant predictors included higher pretreatment MoCA Total Scores and female gender for verbal anterograde memory decline. This study confirmed that the BECS has clinical utility for identifying patients with both reduced and increased risk for adverse cognitive outcomes from ECT.
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Affiliation(s)
- D M Martin
- School of Psychiatry, University of New South Wales, Sydney, NSW, Australia; Black Dog Institute, Sydney, NSW, Australia.
| | - P C Tor
- Institute of Mental Health, Singapore
| | - S Waite
- The Queen Elizabeth Hospital, South Australia, Australia
| | - T Mohan
- Flinders Medical Centre, South Australia, Australia
| | - D Davidson
- Flinders Medical Centre, South Australia, Australia
| | - S Sarma
- Gold Coast Health Service, Queensland, Australia
| | | | - V Dong
- School of Psychiatry, University of New South Wales, Sydney, NSW, Australia; Black Dog Institute, Sydney, NSW, Australia
| | - E Kwan
- School of Psychiatry, University of New South Wales, Sydney, NSW, Australia
| | - C K Loo
- School of Psychiatry, University of New South Wales, Sydney, NSW, Australia; Black Dog Institute, Sydney, NSW, Australia
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9
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Vesel A, Zaplotnik R, Primc G, Mozetič M, Katan T, Kargl R, Mohan T, Kleinschek KS. Rapid Functionalization of Polytetrafluorethylene (PTFE) Surfaces with Nitrogen Functional Groups. Polymers (Basel) 2021; 13:4301. [PMID: 34960856 PMCID: PMC8708819 DOI: 10.3390/polym13244301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/03/2021] [Accepted: 12/06/2021] [Indexed: 11/16/2022] Open
Abstract
The biocompatibility of body implants made from polytetrafluoroethylene (PTFE) is inadequate; therefore, the surface should be grafted with biocompatible molecules. Because PTFE is an inert polymer, the adhesion of the biocompatible film may not be appropriate. Therefore, the PFTE surface should be modified to enable better adhesion, preferably by functionalization with amino groups. A two-step process for functionalization of PTFE surface is described. The first step employs inductively coupled hydrogen plasma in the H-mode and the second ammonia plasma. The evolution of functional groups upon treatment with ammonia plasma in different modes is presented. The surface is saturated with nitrogen groups within a second if ammonia plasma is sustained in the H-mode at the pressure of 35 Pa and forward power of 200 W. The nitrogen-rich surface film persists for several seconds, while prolonged treatment causes etching. The etching is suppressed but not eliminated using pulsed ammonia plasma at 35 Pa and 200 W. Ammonia plasma in the E-mode at the same pressure, but forward power of 25 W, causes more gradual functionalization and etching was not observed even at prolonged treatments up to 100 s. Detailed investigation of the XPS spectra enabled revealing the surface kinetics for all three cases.
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Affiliation(s)
- Alenka Vesel
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Rok Zaplotnik
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Gregor Primc
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Miran Mozetič
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Tadeja Katan
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
| | - Rupert Kargl
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
| | - Tamilselvan Mohan
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
| | - Karin Stana Kleinschek
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
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10
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Dobaj Štiglic A, Kargl R, Beaumont M, Strauss C, Makuc D, Egger D, Plavec J, Rojas OJ, Stana Kleinschek K, Mohan T. Influence of Charge and Heat on the Mechanical Properties of Scaffolds from Ionic Complexation of Chitosan and Carboxymethyl Cellulose. ACS Biomater Sci Eng 2021; 7:3618-3632. [PMID: 34264634 PMCID: PMC8396805 DOI: 10.1021/acsbiomaterials.1c00534] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 06/29/2021] [Indexed: 11/29/2022]
Abstract
As one of the most abundant, multifunctional biological polymers, polysaccharides are considered promising materials to prepare tissue engineering scaffolds. When properly designed, wetted porous scaffolds can have biomechanics similar to living tissue and provide suitable fluid transport, both of which are key features for in vitro and in vivo tissue growth. They can further mimic the components and function of glycosaminoglycans found in the extracellular matrix of tissues. In this study, we investigate scaffolds formed by charge complexation between anionic carboxymethyl cellulose and cationic protonated chitosan under well-controlled conditions. Freeze-drying and dehydrothermal heat treatment were then used to obtain porous materials with exceptional, unprecendent mechanical properties and dimensional long-term stability in cell growth media. We investigated how complexation conditions, charge ratio, and heat treatment significantly influence the resulting fluid uptake and biomechanics. Surprisingly, materials with high compressive strength, high elastic modulus, and significant shape recovery are obtained under certain conditions. We address this mostly to a balanced charge ratio and the formation of covalent amide bonds between the polymers without the use of additional cross-linkers. The scaffolds promoted clustered cell adhesion and showed no cytotoxic effects as assessed by cell viability assay and live/dead staining with human adipose tissue-derived mesenchymal stem cells. We suggest that similar scaffolds or biomaterials comprising other polysaccharides have a large potential for cartilage tissue engineering and that elucidating the reason for the observed peculiar biomechanics can stimulate further research.
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Affiliation(s)
- Andreja Dobaj Štiglic
- Laboratory
for Characterization and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
| | - Rupert Kargl
- Laboratory
for Characterization and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
- Institute
of Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska cesta 46, 2000 Maribor, Slovenia
- Institute
of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Marco Beaumont
- Department
of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Vuorimiehentie 1, Espoo 00076, Finland
| | - Christine Strauss
- Department
of Biotechnology, University of Natural
Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria
| | - Damjan Makuc
- Slovenian
NMR Center, National Institute of Chemistry, Hajdrihova 19, 1001 Ljubljana, Slovenia
| | - Dominik Egger
- Department
of Biotechnology, University of Natural
Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria
| | - Janez Plavec
- Slovenian
NMR Center, National Institute of Chemistry, Hajdrihova 19, 1001 Ljubljana, Slovenia
- EN→FIST
Center of Excellence, Trg OF 13, SI-1000 Ljubljana, Slovenia
- Faculty
of Chemistry and Chemical Technology, University
of Ljubljana, Večna
pot 113, 1000 Ljubljana, Slovenia
| | - Orlando J. Rojas
- Department
of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Vuorimiehentie 1, Espoo 00076, Finland
- Departments
of Chemical and Biological Engineering, Chemistry, and Wood Science,
Bioproducts Institute, University of British
Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Karin Stana Kleinschek
- Institute
of Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska cesta 46, 2000 Maribor, Slovenia
- Institute
of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Tamilselvan Mohan
- Institute
of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
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11
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Culica ME, Chibac-Scutaru AL, Mohan T, Coseri S. Cellulose-based biogenic supports, remarkably friendly biomaterials for proteins and biomolecules. Biosens Bioelectron 2021; 182:113170. [DOI: 10.1016/j.bios.2021.113170] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 03/02/2021] [Accepted: 03/12/2021] [Indexed: 01/18/2023]
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12
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Ajdnik U, Zemljič LF, Plohl O, Pérez L, Trček J, Bračič M, Mohan T. Bioactive Functional Nanolayers of Chitosan-Lysine Surfactant with Single- and Mixed-Protein-Repellent and Antibiofilm Properties for Medical Implants. ACS Appl Mater Interfaces 2021; 13:23352-23368. [PMID: 33998809 PMCID: PMC8289181 DOI: 10.1021/acsami.1c01993] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 05/04/2021] [Indexed: 06/12/2023]
Abstract
Medical implant-associated infections resulting from biofilm formation triggered by unspecific protein adsorption are the prevailing cause of implant failure. However, implant surfaces rendered with multifunctional bioactive nanocoatings offer a promising alternative to prevent the initial attachment of bacteria and effectively interrupt biofilm formation. The need to research and develop novel and stable bioactive nanocoatings for medical implants and a comprehensive understanding of their properties in contact with the complex biological environment are crucial. In this study, we developed an aqueous stable and crosslinker-free polyelectrolyte-surfactant complex (PESC) composed of a renewable cationic polysaccharide, chitosan, a lysine-based anionic surfactant (77KS), and an amphoteric antibiotic, amoxicillin, which is widely used to treat a number of infections caused by bacteria. We successfully introduced the PESC as bioactive functional nanolayers on the "model" and "real" polydimethylsiloxane (PDMS) surfaces under dynamic and ambient conditions. Besides their high stability and improved wettability, these uniformly deposited nanolayers (thickness: 44-61 nm) with mixed charges exhibited strong repulsion toward three model blood proteins (serum albumin, fibrinogen, and γ-globulin) and their competitive interactions in the mixture in real-time, as demonstrated using a quartz crystal microbalance with dissipation (QCM-D). The functional nanolayers with a maximum negative zeta potential (ζ: -19 to -30 mV at pH 7.4), water content (1628-1810 ng cm-2), and hydration (low viscosity and elastic shear modulus) correlated with the mass, conformation, and interaction nature of proteins. In vitro antimicrobial activity testing under dynamic conditions showed that the charged nanolayers actively inhibited the growth of both Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria compared to unmodified PDMS. Given the ease of fabrication of multifunctional and charged biobased coatings with simultaneous protein-repellent and antimicrobial activities, the limitations of individual approaches could be overcome leading to a better and advanced design of various medical devices (e.g., catheters, prosthetics, and stents).
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Affiliation(s)
- Urban Ajdnik
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Lidija Fras Zemljič
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Olivija Plohl
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Lourdes Pérez
- Department
of Surfactants and Nanobiotechnology, Institute
for Advanced Chemistry of Catalonia (IQAC-CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Janja Trček
- Faculty
of Natural Sciences and Mathematics, Department of Biology, University of Maribor, Koroška cesta 160, 2000 Maribor, Slovenia
| | - Matej Bračič
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Tamilselvan Mohan
- Institute
for Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
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13
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Gürer F, Kargl R, Bračič M, Makuc D, Thonhofer M, Plavec J, Mohan T, Kleinschek KS. Water-based carbodiimide mediated synthesis of polysaccharide-amino acid conjugates: Deprotection, charge and structural analysis. Carbohydr Polym 2021; 267:118226. [PMID: 34119179 DOI: 10.1016/j.carbpol.2021.118226] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 04/30/2021] [Accepted: 05/16/2021] [Indexed: 11/17/2022]
Abstract
We report here a one-step aqueous method for the synthesis of isolated and purified polysaccharide-amino acid conjugates. Two different types of amino acid esters: glycine methyl ester and L-tryptophan methyl ester, as model compounds for peptides, were conjugated to the polysaccharide carboxymethylcellulose (CMC) in water using carbodiimide at ambient conditions. Detailed and systematic pH-dependent charge titration and spectroscopy (infrared, nuclear magnetic resonance: 1H, 13C- DEPT 135, 1H- 13C HMBC/HSQC correlation), UV-vis, elemental and ninhydrin analysis provided solid and direct evidence for the successful conjugation of the amino acid esters to the CMC backbone via an amide bond. As the concentration of amino acid esters increased, a conjugation efficiency of 20-80% was achieved. Activated charcoal aided base-catalyzed deprotection of the methyl esters improved the solubility of the conjugates in water. The approach proposed in this work should have the potential to tailor the backbone of polysaccharides containing di- or tri-peptides.
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Affiliation(s)
- Fazilet Gürer
- Laboratory for Characterisation and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
| | - Rupert Kargl
- Institute of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; Institute of Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška cesta 46, 2000 Maribor, Slovenia
| | - Matej Bračič
- Laboratory for Characterisation and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
| | - Damjan Makuc
- Slovenian NMR Centre, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Martin Thonhofer
- Institute of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Janez Plavec
- Slovenian NMR Centre, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia; EN-FIST Centre of Excellence, Trg OF 13, SI-1000 Ljubljana, Slovenia; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Tamilselvan Mohan
- Laboratory for Characterisation and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia; Institute of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.
| | - Karin Stana Kleinschek
- Institute of Chemistry and Technology of Biobased System (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; Institute of Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška cesta 46, 2000 Maribor, Slovenia.
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14
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Jančič U, Bračič M, Ojstršek A, Božič M, Mohan T, Gorgieva S. Consolidation of cellulose nanofibrils with lignosulphonate bio-waste into excellent flame retardant and UV blocking membranes. Carbohydr Polym 2021; 251:117126. [PMID: 33142658 DOI: 10.1016/j.carbpol.2020.117126] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/27/2020] [Accepted: 09/16/2020] [Indexed: 10/23/2022]
Abstract
The use of biomass to produce value-adding materials is a core objective of the circular economy, which has attracted great research interest in recent decades. In this context, we present here a simple dispersion-casting process for consolidation of cellulose nanofibrils (CNF), lignosulphonate (LS)-rich bio-waste and CaCl2 in composite membranes. The addition of CaCl2 to CNF and LS dispersions reduces the ζ potential, due to an electrostatic screening, which promotes the aggregation of CNF, increases its moisture content and promotes LS deposition on CNFs already in the dispersion phase. Addition of both the LS and CaCl2 to CNF dispersion has an adverse effect on the mechanical properties of the final membranes. The effectiveness of the new composite membranes has been described in terms of their passive (charring) flame retardancy and 100 % UVA/UVB shielding capacity, both identified for membranes with the highest LS content, as well as high electronic resistance.
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Affiliation(s)
- Urška Jančič
- University of Maribor, Faculty of Mechanical Engineering, Institute of Engineering Materials and Design, Smetanova ulica 17, 2000, Maribor, Slovenia
| | - Matej Bračič
- University of Maribor, Faculty of Mechanical Engineering, Institute of Engineering Materials and Design, Smetanova ulica 17, 2000, Maribor, Slovenia
| | - Alenka Ojstršek
- University of Maribor, Faculty of Mechanical Engineering, Institute of Engineering Materials and Design, Smetanova ulica 17, 2000, Maribor, Slovenia; University of Maribor, Faculty of Electrical Engineering and Computer Science, Institute of Automation, Koroška cesta 46, 2000, Maribor, Slovenia
| | - Mojca Božič
- Dravske elektrarne Maribor d. o. o., Obrežna Ulica 170, 2000, Maribor, Slovenia
| | - Tamilselvan Mohan
- University of Maribor, Faculty of Mechanical Engineering, Institute of Engineering Materials and Design, Smetanova ulica 17, 2000, Maribor, Slovenia; Graz University of Technology, Institute for Chemistry and Technology of Biobased Systems, Stremayrgasse 9, 8010, Graz, Austria
| | - Selestina Gorgieva
- University of Maribor, Faculty of Mechanical Engineering, Institute of Engineering Materials and Design, Smetanova ulica 17, 2000, Maribor, Slovenia; University of Maribor, Faculty of Electrical Engineering and Computer Science, Institute of Automation, Koroška cesta 46, 2000, Maribor, Slovenia.
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15
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Bračič M, Mohan T, Kargl R, Grießer T, Heinze T, Stana Kleinschek K. Protein repellent anti-coagulative mixed-charged cellulose derivative coatings. Carbohydr Polym 2020; 254:117437. [PMID: 33357910 DOI: 10.1016/j.carbpol.2020.117437] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 08/31/2020] [Accepted: 11/19/2020] [Indexed: 11/27/2022]
Abstract
This study describes the formation of cellulose based polyelectrolyte charge complexes on the surface of biodegradable polycaprolactone (PCL) thin films. Anionic sulphated cellulose (CS) and protonated cationic amino cellulose (AC) were used to form these complexes with a layer-by-layer coating technique. Both polyelectrolytes were analyzed by charge titration methods to elucidate their pH-value dependent protonation behavior. A quartz crystal microbalance with dissipation (QCM-D) in combination with X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) were used to follow the growth, stability and water content of up to three AC/CS bi-layers in aqueous environment. This was combined with coagulation studies on one, two and three bilayers of AC/CS, measuring the thrombin formation rate and the total coagulation time of citrated blood plasma with QCM-D. Stable mixed charged bilayers could be prepared on PCL and significantly higher masses of AC than of CS were present in these complexes. Strong hydration due to the presence of ammonium and sulphate substituents on the backbone of cellulose led to a significant BSA repellent character of three bilayers of AC/CS coatings. The total plasma coagulation time was increased in comparison to neat PCL, indicating an anticoagulative nature of the coatings. Surprisingly, a coating solely composed of an AC layer significantly prolonged the total coagulation time on the surfaces although it did not prevent fibrinogen deposition. It is suggested that these cellulose derivative-based coatings can therefore be used to prevent unwanted BSA deposition and fibrin clot formation on PCL to foster its biomedical application.
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Affiliation(s)
- Matej Bračič
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia.
| | - Tamilselvan Mohan
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, A-8010, Graz, Austria.
| | - Rupert Kargl
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia; Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, A-8010, Graz, Austria; Institute of Bioproducts and Paper Technology (BPTI), Graz University of Technology, Inffeldgasse 23, AT - 8010, Graz, Austria.
| | - Thomas Grießer
- Chair of Chemistry of Polymeric Materials, University of Leoben, Otto-Glöckel-Straße 2, A-8700, Leoben, Austria
| | - Thomas Heinze
- Center of Excellence for Polysaccharide Research, Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstraße 10, D-07743, Jena, Germany
| | - Karin Stana Kleinschek
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, A-8010, Graz, Austria
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16
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Amornkitbamrung L, Bračič D, Bračič M, Hribernik S, Malešič J, Hirn U, Vesel A, Kleinschek KS, Kargl R, Mohan T. Comparison of Trimethylsilyl Cellulose-Stabilized Carbonate and Hydroxide Nanoparticles for Deacidification and Strengthening of Cellulose-Based Cultural Heritage. ACS Omega 2020; 5:29243-29256. [PMID: 33225155 PMCID: PMC7676302 DOI: 10.1021/acsomega.0c03997] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 10/22/2020] [Indexed: 06/11/2023]
Abstract
Herein, colloidal dispersions of alkaline nanoparticles (NPs: CaCO3 and Mg(OH)2) are stabilized by trimethylsilyl cellulose (TMSC) in hexamethyldisiloxane and employed to treat historical wood pulp paper by an effortless dip-coating technique. Both alkaline NPs exhibit high stability and no size and shape changes upon stabilization with the polymer, as shown by UV-vis spectroscopy and transmission electron microscopy. The long-term effect of NP/TMSC coatings is investigated in detail using accelerated aging. The results from the pH-test and back-titration of coated papers show a complete acid neutralization (pH ∼ 7.4) and introduction of adequate alkaline reserve even after prolonged accelerated aging. Scanning electron microscopy-energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and infrared and water contact angle measurements showed the introduction of a thin and smooth hydrophobic NP/TMSC coating on the paper fibers. Acid-catalyzed desilylation of TMSC was observed by declining C-Si infrared absorbance peaks upon aging. The CaCO3 coatings are superior to Mg(OH)2 with respect to a reduced yellowing and lower cellulose degradation upon aging as shown by colorimetric measurements and degree of polymerization analysis. The tensile strength and folding endurance of coated and aged papers are improved to 200-300 and 50-70% as illustrated by tensile strength and double folding endurance measurements.
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Affiliation(s)
- Lunjakorn Amornkitbamrung
- Renewable
Energy Business Group, Mitr Phol Bio-Power
Co., Ltd., 2 Ploenchit
Center, Sukhumvit Road, Klongtoey, 10110 Bangkok, Thailand
| | - Doris Bračič
- Laboratory
for Characterization and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
| | - Matej Bračič
- Laboratory
for Characterization and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
| | - Silvo Hribernik
- Laboratory
for Characterization and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
- Institute
of Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška cesta 46, 2000 Maribor, Slovenia
| | - Jasna Malešič
- National
and University Library, Turjaška 1, 1000 Ljubljana, Slovenia
| | - Ulrich Hirn
- Institute
of Bioproducts and Paper Technology, Graz
University of Technology, Inffeldgasse 23, 8010 Graz, Austria
| | - Alenka Vesel
- Department
of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Teslova 30, SI-1000 Ljubljana, Slovenia
| | - Karin Stana Kleinschek
- Institute
for Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Rupert Kargl
- Institute
for Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Tamilselvan Mohan
- Laboratory
for Characterization and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
- Institute
for Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
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17
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Mohan T, Dobaj Štiglic A, Beaumont M, Konnerth J, Gürer F, Makuc D, Maver U, Gradišnik L, Plavec J, Kargl R, Stana Kleinschek K. Generic Method for Designing Self-Standing and Dual Porous 3D Bioscaffolds from Cellulosic Nanomaterials for Tissue Engineering Applications. ACS Appl Bio Mater 2020; 3:1197-1209. [DOI: 10.1021/acsabm.9b01099] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Tamilselvan Mohan
- Laboratory for Characterisation and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
| | - Andreja Dobaj Štiglic
- Laboratory for Characterisation and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
| | - Marco Beaumont
- University of Natural Resources and Life Sciences (BOKU), Institute of Chemistry of Renewable Resources, Konrad-Lorenz-Strasse 24, 3430 Tulln, Austria
| | - Johannes Konnerth
- University of Natural Resources and Life Sciences (BOKU), Department of Material Sciences and Process Engineering, Institute of Wood Technology and Renewable Materials, Konrad-Lorenz-Strasse 24, 3430 Tulln, Austria
| | - Fazilet Gürer
- Laboratory for Characterisation and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
| | - Damjan Makuc
- National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Uroš Maver
- University of Maribor, Faculty of Medicine, Institute of Biomedical Sciences, Taborska Ulica 8, SI-2000 Maribor, Slovenia
| | - Lidija Gradišnik
- University of Maribor, Faculty of Medicine, Institute of Biomedical Sciences, Taborska Ulica 8, SI-2000 Maribor, Slovenia
| | - Janez Plavec
- National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Rupert Kargl
- Laboratory for Characterisation and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova Ulica 17, 2000 Maribor, Slovenia
- Institute of Paper, Pulp and Fibre Technology (IPZ), Graz University of Technology, Inffeldgasse 23, A-8010 Graz, Austria
- Institute of Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska Cesta 46, 2000 Maribor, Slovenia
| | - Karin Stana Kleinschek
- Institute of Chemistry and Technology of Biobased System, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
- Institute of Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska Cesta 46, 2000 Maribor, Slovenia
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18
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Mohan T, Čas A, Bračič M, Plohl O, Vesel A, Rupnik M, Zemljič LF, Rebol J. Highly Protein Repellent and Antiadhesive Polysaccharide Biomaterial Coating for Urinary Catheter Applications. ACS Biomater Sci Eng 2019; 5:5825-5832. [DOI: 10.1021/acsbiomaterials.9b01288] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Tamilselvan Mohan
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Alja Čas
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Matej Bračič
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Olivija Plohl
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Alenka Vesel
- Department of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Teslova 30, Ljubljana SI-1000, Slovenia
| | - Maja Rupnik
- Faculty of Medicine, University of Maribor, Taborska ulica 8, Maribor 2000, Slovenia
- National Laboratory for Health, Environment and Food, Prvomajska ulica 1, Maribor 2000, Slovenia
| | - Lidija Fras Zemljič
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Janez Rebol
- Department of Otorhinolaryngology, Cervical and Maxillofacial Surgery, University Medical Centre Maribor, Ljubljanska ulica 5, Maribor 2000, Slovenia
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19
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Kargl R, Bračič M, Resnik M, Mozetič M, Bauer W, Stana Kleinschek K, Mohan T. Affinity of Serum Albumin and Fibrinogen to Cellulose, Its Hydrophobic Derivatives and Blends. Front Chem 2019; 7:581. [PMID: 31552215 PMCID: PMC6743410 DOI: 10.3389/fchem.2019.00581] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 08/02/2019] [Indexed: 11/13/2022] Open
Abstract
This work describes the preparation of spin-coated thin polymer films composed of cellulose (CE), ethyl cellulose (EC), and cellulose acetate (CA) in the form of bi- or mono-component coatings on sensors of a quartz crystal microbalance with dissipation monitoring (QCM-D). Depending on the composition and derivative, hydrophilicity can be varied resulting in materials with different surface properties. The surfaces of mono- and bi-component films were also analyzed by atomic force microscopy (AFM) and large differences in the morphologies were found comprising nano- to micrometer sized pores. Extended protein adsorption studies were performed by a QCM-D with 0.1 and 10 mg mL−1 bovine serum albumin (BSA) and 0.1 and 1 mg mL−1 fibrinogen from bovine plasma in phosphate buffered saline. Analysis of the mass of bound proteins was conducted by applying the Voigt model and a comparison was made with the Sauerbrey wet mass of the proteins for all films. The amount of deposited proteins could be influenced by the composition of the films. It is proposed that the observed effects can be exploited in biomaterial science and that they can be used to extent the applicability of bio-based polymer thin films composed of commercial cellulose derivatives.
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Affiliation(s)
- Rupert Kargl
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia.,Faculty of Technical Chemistry, Chemical and Process Engineering, Biotechnology, Institute of Paper, Pulp and Fibre Technology (IPZ), Graz University of Technology, Graz, Austria
| | - Matej Bračič
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia
| | - Matic Resnik
- Department of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Ljubljana, Slovenia
| | - Miran Mozetič
- Department of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Ljubljana, Slovenia
| | - Wolfgang Bauer
- Faculty of Technical Chemistry, Chemical and Process Engineering, Biotechnology, Institute of Paper, Pulp and Fibre Technology (IPZ), Graz University of Technology, Graz, Austria
| | - Karin Stana Kleinschek
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia.,Faculty of Technical Chemistry, Chemical and Process Engineering, Biotechnology, Institute of Inorganic Chemistry, Graz University of Technology, Graz, Austria
| | - Tamilselvan Mohan
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia
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20
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Mohan T, Nagaraj C, Nagy BM, Bračič M, Maver U, Olschewski A, Stana Kleinschek K, Kargl R. Nano- and Micropatterned Polycaprolactone Cellulose Composite Surfaces with Tunable Protein Adsorption, Fibrin Clot Formation, and Endothelial Cellular Response. Biomacromolecules 2019; 20:2327-2337. [PMID: 31070898 PMCID: PMC6750646 DOI: 10.1021/acs.biomac.9b00304] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 05/06/2019] [Indexed: 01/02/2023]
Abstract
This work describes the interaction of the human blood plasma proteins albumin, fibrinogen, and γ-globulins with micro- and nanopatterned polymer interfaces. Protein adsorption studies were correlated with the fibrin clotting time of human blood plasma and with the growth of primary human pulmonary artery endothelial cells (hECs) on these patterns. It was observed that blends of polycaprolactone (PCL) and trimethylsilyl-protected cellulose form various thin-film patterns during spin coating, depending on the mass ratio of the polymers in the spinning solutions. Vapor-phase acid-catalyzed deprotection preserves these patterns but yields interfaces that are composed of hydrophilic cellulose domains enclosed by hydrophobic PCL. The blood plasma proteins are repelled by the cellulose domains, allowing for a suggested selective protein deposition on the PCL domains. An inverse proportional correlation is observed between the amount of cellulose present in the films and the mass of irreversibly adsorbed proteins. This results in significantly increased fibrin clotting times and lower masses of deposited clots on cellulose-containing films as revealed by quartz crystal microbalance with dissipation measurements. Cell viability of hECs grown on these surfaces was directly correlated with higher protein adsorption and faster clot formation. The results show that presented patterned polymer composite surfaces allow for a controllable blood plasma protein coagulation and a significant biological response from hECs. It is proposed that this knowledge can be utilized in regenerative medicine, cell cultures, and artificial vascular grafts by a careful choice of polymers and patterns.
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Affiliation(s)
- Tamilselvan Mohan
- Laboratory
for Characterisation and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova ulica17, 2000 Maribor, Slovenia
| | - Chandran Nagaraj
- Ludwig
Boltzmann Institute for Lung Vascular Research, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Bence M. Nagy
- Ludwig
Boltzmann Institute for Lung Vascular Research, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Matej Bračič
- Laboratory
for Characterisation and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova ulica17, 2000 Maribor, Slovenia
| | - Uroš Maver
- Faculty
of Medicine, Institute of Biomedical Sciences, University of Maribor, Taborska Ulica 8, SI-2000 Maribor, Slovenia
| | - Andrea Olschewski
- Ludwig
Boltzmann Institute for Lung Vascular Research, Stiftingtalstrasse 24, 8010 Graz, Austria
- Chair
of Physiology, Otto Loewi Research Center, Neue Stiftingtalstraße 6/D05, 8010 Graz, Austria
| | - Karin Stana Kleinschek
- Laboratory
for Characterisation and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova ulica17, 2000 Maribor, Slovenia
| | - Rupert Kargl
- Laboratory
for Characterisation and Processing of Polymers, Faculty of Mechanical
Engineering, University of Maribor, Smetanova ulica17, 2000 Maribor, Slovenia
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21
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Mohan T, Li S, Gonzalez G, Prausnitz M, Wang B. Genomic DNA in a dissolvable microneedle patch acts as strong immunostimulator. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.1143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Maver T, Mohan T, Gradišnik L, Finšgar M, Stana Kleinschek K, Maver U. Polysaccharide Thin Solid Films for Analgesic Drug Delivery and Growth of Human Skin Cells. Front Chem 2019; 7:217. [PMID: 31024901 PMCID: PMC6466929 DOI: 10.3389/fchem.2019.00217] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 03/19/2019] [Indexed: 11/13/2022] Open
Abstract
Chronic wounds not only lower the quality of patient's life significantly, but also present a huge financial burden for the healthcare systems around the world. Treatment of larger wounds often requires the use of more complex materials, which can ensure a successful renewal or replacement of damaged or destroyed tissues. Despite a range of advanced wound dressings that can facilitate wound healing, there are still no clinically used dressings for effective local pain management. Herein, alginate (ALG) and carboxymethyl cellulose (CMC), two of the most commonly used materials in the field of chronic wound care, and combination of ALG-CMC were used to create a model wound dressing system in the form of multi-layered thin solid films using the spin-assisted layer-by-layer (LBL) coating technique. The latter multi-layer system was used to incorporate and study the release kinetics of analgesic drugs such as diclofenac and lidocaine at physiological conditions. The wettability, morphology, physicochemical and surface properties of the coated films were evaluated using different surface sensitive analytical tools. The influence of in situ incorporated drug molecules on the surface properties (e.g., roughness) and on the proliferation of human skin cells (keratinocytes and skin fibroblasts) was further evaluated. The results obtained from this preliminary study should be considered as the basis for the development "real" wound dressing materials and for 3D bio-printing applications.
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Affiliation(s)
- Tina Maver
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia.,Department of Pharmacology, Faculty of Medicine, University of Maribor, Maribor, Slovenia
| | - Tamilselvan Mohan
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia
| | - Lidija Gradišnik
- Faculty of Medicine, Institute of Biomedical Sciences, University of Maribor, Maribor, Slovenia
| | - Matjaž Finšgar
- Faculty of Chemistry and Chemical Engineering, University of Maribor, Maribor, Slovenia
| | - Karin Stana Kleinschek
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia.,Institute for Chemistry and Technology of Materials, Graz University of Technology, Graz, Austria
| | - Uroš Maver
- Department of Pharmacology, Faculty of Medicine, University of Maribor, Maribor, Slovenia.,Faculty of Medicine, Institute of Biomedical Sciences, University of Maribor, Maribor, Slovenia
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23
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Srinivasaiah S, Musumeci G, Mohan T, Castrogiovanni P, Absenger-Novak M, Zefferer U, Mostofi S, Bonyadi Rad E, Grün NG, Weinberg AM, Schäfer U. A 300 μm Organotypic Bone Slice Culture Model for Temporal Investigation of Endochondral Osteogenesis. Tissue Eng Part C Methods 2019; 25:197-212. [DOI: 10.1089/ten.tec.2018.0368] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- Sriveena Srinivasaiah
- Department of Orthopedics and Trauma Surgery, Medical University of Graz, Graz, Austria
- Research Unit for Experimental Neurotraumatology, Department of Neurosurgery, Medical University of Graz, Graz, Austria
| | - Giuseppe Musumeci
- Human Anatomy and Histology Section, Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | - Tamilselvan Mohan
- Institute of Chemistry, University of Graz, Graz, Austria
- Laboratory for Characterization and Processing, Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia
| | - Paola Castrogiovanni
- Human Anatomy and Histology Section, Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | | | - Ulrike Zefferer
- Research Unit for Experimental Neurotraumatology, Department of Neurosurgery, Medical University of Graz, Graz, Austria
| | - Sepideh Mostofi
- Department of Orthopedics and Trauma Surgery, Medical University of Graz, Graz, Austria
| | - Ehsan Bonyadi Rad
- Department of Orthopedics and Trauma Surgery, Medical University of Graz, Graz, Austria
- Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Nicole Gabriele Grün
- Department of Orthopedics and Trauma Surgery, Medical University of Graz, Graz, Austria
| | | | - Ute Schäfer
- Research Unit for Experimental Neurotraumatology, Department of Neurosurgery, Medical University of Graz, Graz, Austria
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24
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Kurečič M, Mohan T, Virant N, Maver U, Stergar J, Gradišnik L, Kleinschek KS, Hribernik S. A green approach to obtain stable and hydrophilic cellulose-based electrospun nanofibrous substrates for sustained release of therapeutic molecules. RSC Adv 2019; 9:21288-21301. [PMID: 35521346 PMCID: PMC9066020 DOI: 10.1039/c9ra03399h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Accepted: 07/04/2019] [Indexed: 11/21/2022] Open
Abstract
Stable and (bio)-compatible nanofibrous matrices showing effective incorporation and release of nonsteroidal anti-inflammatory drugs (NSAIDs) hold a huge potential in tissue regeneration and wound healing.
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Affiliation(s)
- Manja Kurečič
- Laboratory for Characterization and Processing of Polymers
- Faculty of Mechanical Engineering
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Tamilselvan Mohan
- Laboratory for Characterization and Processing of Polymers
- Faculty of Mechanical Engineering
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Natalija Virant
- Laboratory for Characterization and Processing of Polymers
- Faculty of Mechanical Engineering
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Uroš Maver
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Janja Stergar
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Lidija Gradišnik
- Institute of Biomedical Sciences
- Faculty of Medicine
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Karin Stana Kleinschek
- Laboratory for Characterization and Processing of Polymers
- Faculty of Mechanical Engineering
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Silvo Hribernik
- Laboratory for Characterization and Processing of Polymers
- Faculty of Mechanical Engineering
- University of Maribor
- 2000 Maribor
- Slovenia
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25
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Chandrashekar BS, Prabhakara S, Mohan T, Shabeer D, Bhandare B, Nalini M, Sharmila PS, Meghana DL, Reddy BK, Hanumantha Rao HM, Sahajananda H, Anbazhagan K. Characterization of Rubia cordifolia L. root extract and its evaluation of cardioprotective effect in Wistar rat model. Indian J Pharmacol 2018; 50:12-21. [PMID: 29861523 PMCID: PMC5954628 DOI: 10.4103/ijp.ijp_418_17] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
OBJECTIVES: Rubia cordifolia L. (RC) is a well-known and highly valuable medicinal plant in the Ayurvedic system. The present study involves evaluating antioxidant and cardioprotective property of RC root extract. MATERIALS AND METHODS: The characterization of RC root extract was carried out using standard phytochemical and biochemical analysis. The functional groups were analyzed by Fourier transform infrared (FTIR) spectroscopy and phytotherapeutic compounds were identified using high-resolution mass spectrometry (HR-MS). Cardioprotective activity of RC root extract was investigated against cyclophosphamide (CP; 100 mg/kg, i.p)-induced cardiotoxicity in male albino Wistar rats. RC (100, 200, and 400 mg/kg, p.o) or silymarin (100 mg/kg, p.o) was administered immediately after CP on the 1st day and the next consecutive 10 days. Biochemical and histopathological analysis was performed to observe the cardioprotective effects of RC root extract. RESULTS: Phytochemical analysis revealed the presence of secondary metabolites that include alkaloids, flavonoids, saponins, and anthraquinones in RC root extract. FTIR analysis revealed the presence of several functional groups. Based on HR-MS analysis, eight major phytotherapeutic compounds were identified in methanol root extract of RC. Biochemical analysis in CP-induced rat model administered with RC extract revealed significantly enhanced levels of antioxidant markers such as superoxide dismutase, catalase, and glutathione S-transferase. Histopathological study showed that the rat model treated with the root extract had reduced the cardiac injury. CONCLUSION: Our results have shown that the RC extract contains various antioxidant compounds with cardioprotective effect. Treatment with RC root extract could significantly protect CP-induced rats from cardiac tissue injury by restoring the antioxidant markers.
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Affiliation(s)
- B S Chandrashekar
- Chemistry of Forest Products (CFP) Division, Institute of Wood Science and Technology, Bangalore, Karnataka, India
| | - S Prabhakara
- Department of Genetics, Central Research Laboratory, Bangalore, Karnataka, India
| | - T Mohan
- Department of Genetics, Central Research Laboratory, Bangalore, Karnataka, India
| | - D Shabeer
- Department of Pharmacology, Central Research Laboratory, RajaRajeswari Medical College and Hospital, Bangalore, Karnataka, India
| | - Basavaraj Bhandare
- Department of Pharmacology, Central Research Laboratory, RajaRajeswari Medical College and Hospital, Bangalore, Karnataka, India
| | - M Nalini
- Department of Pathology, Central Research Laboratory, RajaRajeswari Medical College and Hospital, Bangalore, Karnataka, India
| | - P S Sharmila
- Department of Pathology, Central Research Laboratory, RajaRajeswari Medical College and Hospital, Bangalore, Karnataka, India
| | - D L Meghana
- Department of Biological, Sciences Bangalore University, Bangalore, Karnataka, India
| | - Basanth Kumar Reddy
- Department of Genetics, Central Research Laboratory, Bangalore, Karnataka, India
| | - H M Hanumantha Rao
- Department of Genetics, Central Research Laboratory, Bangalore, Karnataka, India
| | - H Sahajananda
- Department of Anaesthesia and Central Research Laboratory, Central Research Laboratory, RajaRajeswari Medical College and Hospital, Bangalore, Karnataka, India
| | - K Anbazhagan
- Department of Molecular Medicine, Central Research Laboratory, RajaRajeswari Medical College and Hospital, Bangalore, Karnataka, India
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26
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Premkumar TM, Seralathan S, Gopalakrishnan R, Mohan T, Hariram V. Experimental data of the study on H-rotor with semi-elliptic shaped bladed vertical axis wind turbine. Data Brief 2018; 19:1828-1836. [PMID: 30229055 PMCID: PMC6141365 DOI: 10.1016/j.dib.2018.06.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 06/06/2018] [Accepted: 06/19/2018] [Indexed: 11/19/2022] Open
Abstract
The performance and load test data of the proposed H-rotor with semi-elliptical shaped blade vertical axis wind turbine is carried out at the laboratory using 1 m diameter axial fan. India has a long coastline and low-wind velocity ranging from 3 to 10 m/s which is available everywhere in the country irrespective of climatic conditions. The data article is carried out at different aspect ratios along with tilt of the blades and without tilting of the blades. These data sets provide the researchers to further study experimentally as well as numerically in order to enhance the performance of the proposed VAWT. The data presented here are measured at wind velocity ranging from 3 to 6 m/s. The raw data captured using data acquisition system are processed and presented in a form so as to compare it with other typical VAWT.
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Affiliation(s)
- T Micha Premkumar
- School of Mechanical Sciences, Department of Mechanical Engineering Hindustan Institute of Technology and Science, Chennai, Tamil Nadu, India
| | - S Seralathan
- School of Mechanical Sciences, Department of Mechanical Engineering Hindustan Institute of Technology and Science, Chennai, Tamil Nadu, India
| | - R Gopalakrishnan
- School of Mechanical Sciences, Department of Mechanical Engineering Hindustan Institute of Technology and Science, Chennai, Tamil Nadu, India
| | - T Mohan
- School of Mechanical Sciences, Department of Mechanical Engineering Hindustan Institute of Technology and Science, Chennai, Tamil Nadu, India
| | - V Hariram
- School of Mechanical Sciences, Department of Mechanical Engineering Hindustan Institute of Technology and Science, Chennai, Tamil Nadu, India
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27
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Micha Premkumar T, Sivamani S, Kirthees E, Hariram V, Mohan T. Data set on the experimental investigations of a helical Savonius style VAWT with and without end plates. Data Brief 2018; 19:1925-1932. [PMID: 30229067 PMCID: PMC6141439 DOI: 10.1016/j.dib.2018.06.113] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/29/2018] [Accepted: 06/27/2018] [Indexed: 11/19/2022] Open
Abstract
The performance test on a helical Savonius style VAWT are carried out with end plates and without end plates for low wind velocities from 3 m/s to 6 m/s. The raw data measured using instruments are recorded using digital acquisition system. These data are processed and presented as dimensionless parameters namely, coefficient of power, coefficient of torque and tip speed ratio in order to compare it with other VAWTs.
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28
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Singh A, Gowtham S, Chakrapani L, Ashokkumar S, Kumar SK, Prema V, Bhavani RD, Mohan T, Sathyamoorthy Y. Aegeline vs Statin in the treatment of Hypercholesterolemia: A comprehensive study in rat model of liver steatosis. FFHD 2018. [DOI: 10.31989/ffhd.v8i1.381] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Background: Aegeline (AG) is a natural hydroxyamide which has not been explored in depth for its potential applications in food, pharmaceutical, and cosmetic industries. Accordingly, in this study, the property of AG as antioxidant, anti-hypercholesterolemic, and an anti-aging component was explored. The hepatoprotective effect of AG on hypercholesterolemic rats was investigated for health care benefits as a hypocholesterolemic drug vs Atorvastatin (AV) for the first time.Objective: The objective was to delineate the mechanism of action of AG in impeding high cholesterol diet (HCD) induced hepatic steatosis in a rat model with special reference to antioxidant status and expression of Nuclear Factor Kappa B (NF-κB) mediated cell adhesion molecules.Methods: Thirty-six Wistar rats were divided into six groups. The pathology group rats were fed with HCD for 16 weeks and treatment groups rats were fed with HCD for 12 weeks and further supplemented with AG/AV for another 4 weeks. In vivo and in vitro experiments were carried out to find out the relative markers of the pathological condition likely Malondialdehyde (MDA), Oxidized LDL (Ox-LDL), and CRP levels were determined. Standard biochemical parameters were carried out. The expression profile by Western blot analysis was performed to assess the levels of NF-κB, Interleukin 6(IL6) and vascular cell adhesion molecule1 (VCAM1), in the hepatic tissues of various experimental groups. Additionally, histopathological examination of liver tissue sections was carried out.Results: AG administration effectively decreased the oxidative stress induced by HCD as evidenced by MDA levels. Furthermore, the lowered levels of Ox-LDL and CRP in AG administered rats deem it to be a potent anti-inflammatory agent. Compared to AV, AG had a pronounced effect in down-regulating the expression of cell adhesion molecules.Conclusion: Thus, this study validates AG to be an effective stratagem in bringing down the oxidative stress induced by HCD and can be deemed as an anti-hypercholesterolemic and anti-steatotic agent.Keywords: Aegeline, Atorvastatin, liver, hypercholesterolemia, aging
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29
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Stana J, Stergar J, Gradišnik L, Flis V, Kargl R, Fröhlich E, Stana Kleinschek K, Mohan T, Maver U. Multilayered Polysaccharide Nanofilms for Controlled Delivery of Pentoxifylline and Possible Treatment of Chronic Venous Ulceration. Biomacromolecules 2017; 18:2732-2746. [DOI: 10.1021/acs.biomac.7b00523] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Jan Stana
- Schön Klinik Vogtareuth, Department of Vascular
and Endovascular Surgery, Krankenhausstraße 20, 83569 Vogtareuth, Germany
| | - Janja Stergar
- University of Maribor, Faculty of Medicine, Institute
of Biomedical Sciences, Taborska ulica 8, SI-2000 Maribor, Slovenia
| | - Lidija Gradišnik
- University of Maribor, Faculty of Medicine, Institute
of Biomedical Sciences, Taborska ulica 8, SI-2000 Maribor, Slovenia
| | - Vojko Flis
- University Medical Centre Maribor, Division of Surgery,
Department of Vascular Surgery, Ljubljanka ulica 5, SI-2000 Maribor, Slovenia
| | - Rupert Kargl
- University of Maribor, Faculty of Mechanical Engineering,
Laboratory for Characterisation and Processing of Polymers, Smetanova 17, SI-2000 Maribor, Slovenia
| | - Eleonore Fröhlich
- Medical University of Graz, Center for Medical Research,
Core Facility Microscopy, Stiftingtalstraße 24, 8010 Graz, Austria
| | - Karin Stana Kleinschek
- University of Maribor, Faculty of Mechanical Engineering,
Laboratory for Characterisation and Processing of Polymers, Smetanova 17, SI-2000 Maribor, Slovenia
| | - Tamilselvan Mohan
- University of Graz, Institute of Chemistry, Heinrichstrasse 28, 8010 Graz, Austria
| | - Uroš Maver
- University of Maribor, Faculty of Medicine, Institute
of Biomedical Sciences, Taborska ulica 8, SI-2000 Maribor, Slovenia
- University of Maribor, Faculty of Medicine, Department
of Pharmacology, Taborska
ulica 8, SI-2000 Maribor, Slovenia
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30
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Bračič M, Fras-Zemljič L, Pérez L, Kogej K, Stana-Kleinschek K, Kargl R, Mohan T. Protein-repellent and antimicrobial nanoparticle coatings from hyaluronic acid and a lysine-derived biocompatible surfactant. J Mater Chem B 2017; 5:3888-3897. [PMID: 32264250 DOI: 10.1039/c7tb00311k] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biofilm formation triggered by uncontrolled protein adsorption, on medical devices is the leading cause of catheter-associated urinary tract infections (CAUTI) during implantation. Herein, we report a water-based, green and one-step strategy to functionalize surfaces of silicone catheters, poly(dimethylsiloxane) (PDMS), with antifouling and antimicrobial substances to avoid uncontrolled protein adsorption and microbial attachment. A novel synergetic formulation consisting of an anionic glycosaminoglycan (hyaluronic acid, HA) and a lysine-derived biocompatible cationic surfactant (Nε-myristoyl-lysine methyl ester, MKM) was prepared, resulting in the formation of nanoparticles (NPs, ca. 100-250 nm). Besides their high stability and long-lasting hydrophilicity in ambient and aqueous environments for 60 days, the nanometric layers (48 ± 3 nm) of HA-MKM NPs on PDMS showed no adsorption of BSA and lysozyme and substantially lower adsorption of fibrinogen as revealed by a quartz crystal microbalance with dissipation (QCM-D). In vitro antimicrobial test with S. aureus, E. coli, P. aeruginosa, P. mirabilis, C. albicans microbes under dynamic conditions revealed that the microbial growth was hampered by 85% compared with unmodified PDMS. Given the multiple functionalities, charges and diverse physiochemical properties of polysaccharide-lysine-based surfactant mixtures, this approach can be easily extended to the development of novel coatings on other silicone-based materials, thereby broadening potential applicability of PDMS-based biomaterials/devices in microfluidics, diagnostic biosensors and others.
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Affiliation(s)
- M Bračič
- Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
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31
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Vijayadarshan P, Mohan T, Viswanath J, Venugopal KJ, Rao NV, Gupta A, Venkataraman A. Large Scale Synthesis of Nickel Oxide (Nio) by Self Propagated Combustion Reaction. ACTA ACUST UNITED AC 2017. [DOI: 10.13005/msri/140106] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This is a report on large scale synthesis of nickel oxide (NiO) using polyethylene glycol as a fuel employing self-propagating combustion reaction with nickel oxalate as precursor. The synthesized NiO is characterized for its crystal structure, morphology and bonding via XRD, SEM and FTIR respectively. Thermal behavior of the synthesized NiO is studied employing TGA and DSC. Super paramagnetic behavior of the synthesized is studied by magnetic hysteresis.
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Affiliation(s)
- P Vijayadarshan
- R and D center, Premier Explosives Limited, P.O. Peddakandukur-508286, Yadadri District, Telangana, India
| | - T. Mohan
- R and D center, Premier Explosives Limited, P.O. Peddakandukur-508286, Yadadri District, Telangana, India
| | - J Viswanath
- Material Chemistry laboratory, Department of Materials Science, Gulbarga University, Kalaburagi-585106, Karnataka. India
| | - K. J Venugopal
- Material Chemistry laboratory, Department of Materials Science, Gulbarga University, Kalaburagi-585106,
| | - N. V Rao
- R and D center, Premier Explosives Limited, P.O. Peddakandukur-508286, Yadadri District, Telangana, India
| | - Amarnath Gupta
- R and D center, Premier Explosives Limited, P.O. Peddakandukur-508286, Yadadri District, Telangana, India
| | - A Venkataraman
- Department of Chemistry, Gulbarga University, Kalaburagi-585106, Karnataka. India
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32
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Mohan T, Niegelhell K, Nagaraj C, Reishofer D, Spirk S, Olschewski A, Stana Kleinschek K, Kargl R. Interaction of Tissue Engineering Substrates with Serum Proteins and Its Influence on Human Primary Endothelial Cells. Biomacromolecules 2017; 18:413-421. [DOI: 10.1021/acs.biomac.6b01504] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tamilselvan Mohan
- Institute
of Chemistry, University of Graz, Heinrichstraße 28, 8010 Graz, Austria
| | - Katrin Niegelhell
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Chandran Nagaraj
- Ludwig Boltzmann
Institute for Lung Vascular Research, Stiftingtalstrasse 24, 8010 Graz, Austria
- Institute
of Physiology, Medical University of Graz, Harrachgasse 21/V, 8010 Graz, Austria
| | - David Reishofer
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
- Laboratory
for Characterization and Processing of Polymers (LCPP), University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Stefan Spirk
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
- Laboratory
for Characterization and Processing of Polymers (LCPP), University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Andrea Olschewski
- Ludwig Boltzmann
Institute for Lung Vascular Research, Stiftingtalstrasse 24, 8010 Graz, Austria
- Institute
of Physiology, Medical University of Graz, Harrachgasse 21/V, 8010 Graz, Austria
| | - Karin Stana Kleinschek
- Laboratory
for Characterization and Processing of Polymers (LCPP), University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Rupert Kargl
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
- Laboratory
for Characterization and Processing of Polymers (LCPP), University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
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33
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Strasser S, Niegelhell K, Kaschowitz M, Markus S, Kargl R, Stana-Kleinschek K, Slugovc C, Mohan T, Spirk S. Exploring Nonspecific Protein Adsorption on Lignocellulosic Amphiphilic Bicomponent Films. Biomacromolecules 2016; 17:1083-92. [DOI: 10.1021/acs.biomac.5b01700] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Simone Strasser
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Katrin Niegelhell
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Manuel Kaschowitz
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Sabina Markus
- Institute
of Engineering and Design of Materials, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Rupert Kargl
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
- Institute
of Engineering and Design of Materials, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Karin Stana-Kleinschek
- Institute
of Engineering and Design of Materials, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Christian Slugovc
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Tamilselvan Mohan
- Institute
of Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria
| | - Stefan Spirk
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
- Institute
of Engineering and Design of Materials, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
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34
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Mohan T, Rathner R, Reishofer D, Koller M, Elschner T, Spirk S, Heinze T, Stana-Kleinschek K, Kargl R. Designing Hydrophobically Modified Polysaccharide Derivatives for Highly Efficient Enzyme Immobilization. Biomacromolecules 2015. [DOI: 10.1021/acs.biomac.5b00638] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tamilselvan Mohan
- Institute
for Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria
| | - Raffael Rathner
- Institute
for Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria
| | - David Reishofer
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Martin Koller
- Institute
for Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria
- ARENA − Association for Resource-Efficient and Sustainable Technologies, Inffeldgasse 21b, 8010 Graz, Austria
| | - Thomas Elschner
- Center of
Excellence for Polysaccharide Research, Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
| | - Stefan Spirk
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Thomas Heinze
- Center of
Excellence for Polysaccharide Research, Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
| | - Karin Stana-Kleinschek
- Institute
for Engineering Materials and Design, University of Maribor, Smetanova
17, 2000 Maribor, Slovenia
| | - Rupert Kargl
- Institute
for Engineering Materials and Design, University of Maribor, Smetanova
17, 2000 Maribor, Slovenia
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35
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Ehmann HMA, Werzer O, Pachmajer S, Mohan T, Amenitsch H, Resel R, Kornherr A, Stana-Kleinschek K, Kontturi E, Spirk S. Surface-Sensitive Approach to Interpreting Supramolecular Rearrangements in Cellulose by Synchrotron Grazing Incidence Small-Angle X-ray Scattering. ACS Macro Lett 2015; 4:713-716. [PMID: 35596493 DOI: 10.1021/acsmacrolett.5b00306] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The supramolecular rearrangements of biopolymers have remained difficult to discern. Here, we present a versatile approach that allows for an in situ investigation of two major types of rearrangements typically observed with cellulose, the most abundant biopolymer on earth. Model thin films were employed to study time-resolved pore size changes using in situ grazing incidence small-angle X-ray scattering (GISAXS) during regeneration and drying.
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Affiliation(s)
- Heike M. A. Ehmann
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
| | - Oliver Werzer
- Institute
of Pharmaceutical Science, Department of Pharmaceutical Technology, Karl-Franzens University of Graz, Universitätsplatz 1, A-8010 Graz, Austria
| | - Stefan Pachmajer
- Institute
of Solid State Physics, Graz University of Technology, Petersgasse
16, A-8010 Graz, Austria
| | - Tamilselvan Mohan
- Institute
for Chemistry, Karl-Franzens University of Graz, Heinrichstraße
28, A-8010 Graz, Austria
| | - Heinz Amenitsch
- Institute
of Inorganic Chemistry, Graz University of Technology, Stremayrgasse
9, A-8010 Graz, Austria
| | - Roland Resel
- Institute
of Solid State Physics, Graz University of Technology, Petersgasse
16, A-8010 Graz, Austria
| | - Andreas Kornherr
- Mondi Uncoated Fine & Kraft Paper GmbH, Marxergasse 4A, 1030 Wien, Austria
| | - Karin Stana-Kleinschek
- Institute
for Engineering Materials and Design, University of Maribor, Smetanova
ulica 17, SI-2000 Maribor, Slovenia
| | - Eero Kontturi
- Polymer and Composites
Engineering group, Department of Forest Products Technology, Aalto University, PO
Box 16300, FI-00076 Aalto, Finland
- Department
of Chemical Engineering, Imperial College London, South Kensington
Campus, London SW7 2AZ, U.K
| | - Stefan Spirk
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
- Institute
for Engineering Materials and Design, University of Maribor, Smetanova
ulica 17, SI-2000 Maribor, Slovenia
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36
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Sekhar MC, Venkatesulu A, Mohan T, Gowrisankar M. Density Functional Theory, Natural Bond Orbital and Atoms in Molecule Analyses on the Hydrogen Bonding Interactions in 2-chloroaniline-Carboxylic Acids. ACTA ACUST UNITED AC 2015. [DOI: 10.13005/ojc/310233] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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37
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Kargl R, Vorraber V, Ribitsch V, Köstler S, Stana-Kleinschek K, Mohan T. Selective immobilization and detection of DNA on biopolymer supports for the design of microarrays. Biosens Bioelectron 2015; 68:437-441. [PMID: 25618375 DOI: 10.1016/j.bios.2015.01.038] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 01/12/2015] [Accepted: 01/16/2015] [Indexed: 10/24/2022]
Abstract
DNA immobilization for the manufacturing of microarrays requires sufficient probe density, low unspecific binding and high interaction efficiency with complementary strands that are detected from solutions. Many of these important parameters are affected by the surface chemistry and the blocking steps conducted during DNA spotting and hybridization. This work describes an alternative method to selectively immobilize probes and to detect DNA on biocompatible, hydrophilic cellulose coated supports with low unspecific binding, high selectivity and appropriate sensitivity. It takes advantage of a relatively selective adsorption of water soluble polysaccharides on a solid cellulose matrix. Single strands of DNA were conjugated to this soluble polysaccharide and subsequently micro-spotted on solid cellulose thin films that were coated on glass and polymer slides. This resulted in adsorptively bound DNA-probes that were used to detect complementary, labelled DNA strands with different lengths and sequences by hybridization. The interaction of the DNA-conjugates with cellulose surfaces and the selectivity of hybridization were investigated by a quartz crystal microbalance with dissipation monitoring (QCM-D) and fluorescence scanning. The method of non-covalent immobilization of DNA probes on an uncharged, non-reactive, hydrophilic support lowers the unspecific binding and the number of handling steps required to conduct the experiments for the detection of DNA on microarrays. Simultaneously selectivity, hybridization efficiency and detection limits are maintained.
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Affiliation(s)
- R Kargl
- Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia.
| | - V Vorraber
- Institute of Chemistry, University of Graz, Heinrichstraße 28/3, 8010 Graz, Austria
| | - V Ribitsch
- Institute of Chemistry, University of Graz, Heinrichstraße 28/3, 8010 Graz, Austria
| | - S Köstler
- Materials, Sensor Systems, Institute for Surface Technologies and Photonics, Joanneum Research, Franz-Pichler-Straße 30, 8160 Weiz, Austria
| | - K Stana-Kleinschek
- Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - T Mohan
- Institute of Chemistry, University of Graz, Heinrichstraße 28/3, 8010 Graz, Austria
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38
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Amornkitbamrung L, Mohan T, Hribernik S, Reichel V, Faivre D, Gregorova A, Engel P, Kargl R, Ribitsch V. Polysaccharide stabilized nanoparticles for deacidification and strengthening of paper. RSC Adv 2015. [DOI: 10.1039/c4ra15153d] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This paper reports an investigation on the use of a highly stable colloidal organic dispersion consisting of a polysaccharides and alkaline nanoparticles for the simultaneous deacidification and strengthening of historical wood pulp papers.
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Affiliation(s)
| | | | - Silvo Hribernik
- Faculty of Mechanical Engineering
- Institute for Engineering Materials and Design
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Victoria Reichel
- Department of Biomaterials
- Max Planck Institute of Colloids and Interfaces
- Potsdam
- Germany
| | - Damien Faivre
- Department of Biomaterials
- Max Planck Institute of Colloids and Interfaces
- Potsdam
- Germany
| | - Adriana Gregorova
- Institute for Chemistry and Technology of Materials
- Graz University of Technology
- AT 8010 Graz
- Austria
| | - Patricia Engel
- European Research Centre for Book and Paper Conservation-Restoration
- Donau-Universität Krems
- 3500 Krems
- Austria
| | - Rupert Kargl
- Faculty of Mechanical Engineering
- Institute for Engineering Materials and Design
- University of Maribor
- 2000 Maribor
- Slovenia
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39
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Maver T, Hribernik S, Mohan T, Smrke DM, Maver U, Stana-Kleinschek K. Functional wound dressing materials with highly tunable drug release properties. RSC Adv 2015. [DOI: 10.1039/c5ra11972c] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Tuning of diclofenac release was achieved through incorporation into four different wound dressing materials. Proposed specific material-drug combinations could greatly improve efficiency in treatment of different wound types.
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Affiliation(s)
- Tina Maver
- Faculty of Mechanical Engineering
- Laboratory for Characterisation and Processing of Polymers
- University of Maribor
- SI-2000 Maribor
- Slovenia
| | - Silvo Hribernik
- Faculty of Mechanical Engineering
- Laboratory for Characterisation and Processing of Polymers
- University of Maribor
- SI-2000 Maribor
- Slovenia
| | | | | | - Uroš Maver
- Faculty of Medicine
- Department of Pharmacology and Experimental Toxicology
- University of Maribor
- SI-2000 Maribor
- Slovenia
| | - Karin Stana-Kleinschek
- Faculty of Mechanical Engineering
- Laboratory for Characterisation and Processing of Polymers
- University of Maribor
- SI-2000 Maribor
- Slovenia
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40
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Mohan T, Findenig G, Höllbacher S, Cerny C, Ristić T, Kargl R, Spirk S, Maver U, Stana-Kleinschek K, Ribitsch V. Interaction and enrichment of protein on cationic polysaccharide surfaces. Colloids Surf B Biointerfaces 2014; 123:533-41. [DOI: 10.1016/j.colsurfb.2014.09.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 09/20/2014] [Accepted: 09/25/2014] [Indexed: 01/31/2023]
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41
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Mohan T, Niegelhell K, Zarth CSP, Kargl R, Köstler S, Ribitsch V, Heinze T, Spirk S, Stana-Kleinschek K. Triggering protein adsorption on tailored cationic cellulose surfaces. Biomacromolecules 2014; 15:3931-41. [PMID: 25233035 DOI: 10.1021/bm500997s] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The equipment of cellulose ultrathin films with BSA (bovine serum albumin) via cationization of the surface by tailor-made cationic celluloses is described. In this way, matrices for controlled protein deposition are created, whereas the extent of protein affinity to these surfaces is controlled by the charge density and solubility of the tailored cationic cellulose derivative. In order to understand the impact of the cationic cellulose derivatives on the protein affinity, their interaction capacity with fluorescently labeled BSA is investigated at different concentrations and pH values. The amount of deposited material is quantified using QCM-D (quartz crystal microbalance with dissipation monitoring, wet mass) and MP-SPR (multi-parameter surface plasmon resonance, dry mass), and the mass of coupled water is evaluated by combination of QCM-D and SPR data. It turns out that adsorption can be tuned over a wide range (0.6-3.9 mg dry mass m(-2)) depending on the used conditions for adsorption and the type of employed cationic cellulose. After evaluation of protein adsorption, patterned cellulose thin films have been prepared and the cationic celluloses were adsorbed in a similar fashion as in the QCM-D and SPR experiments. Onto these cationic surfaces, fluorescently labeled BSA in different concentrations is deposited by an automatized spotting apparatus and a correlation between the amount of the deposited protein and the fluorescence intensity is established.
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Affiliation(s)
- Tamilselvan Mohan
- Institute for Chemistry, University of Graz , Heinrichstrasse 28, 8010 Graz, Austria
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42
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Mohan T, Kargl R, Tradt KE, Kulterer MR, Braćić M, Hribernik S, Stana-Kleinschek K, Ribitsch V. Antifouling coating of cellulose acetate thin films with polysaccharide multilayers. Carbohydr Polym 2014; 116:149-58. [PMID: 25458284 DOI: 10.1016/j.carbpol.2014.04.068] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 04/11/2014] [Accepted: 04/15/2014] [Indexed: 11/30/2022]
Abstract
In this investigation, partially deacetylated cellulose acetate (DCA) thin films were prepared and modified with hydrophilic polysaccharides with the layer-by-layer (LbL) technique. As polysaccharides, chitosan (CHI) and carboxymethyl cellulose (CMC) were used. DCA thin films were manufactured by exposing spin coated cellulose acetate to potassium hydroxide solutions for various times. The deacetylation process was monitored by attenuated total reflectance-infrared spectroscopy, film thickness and static water contact angle measurements. A maximum of three bilayers was created from the alternating deposition of CHI and CMC on the DCA films under two different conditions namely constant ionic strengths and varying pH values of the CMC solutions. Precoatings of CMC at pH 2 were used as a base layer. The sequential deposition of CMC and CHI was investigated with a quartz crystal microbalance with dissipation, film thickness, static water contact angle and atomic force microscopy (AFM) measurements. The versatility and applicability of the developed functional coatings was shown by removing the multilayers by rinsing with mixtures containing HCl/NaCl. The developed LbL coatings are used for studying the fouling behavior of bovine serum albumin (BSA).
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Affiliation(s)
- Tamilselvan Mohan
- Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstraße 28, 8010 Graz, Austria.
| | - Rupert Kargl
- Institute for the Engineering and Design of Materials, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia.
| | - Karin Eva Tradt
- Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstraße 28, 8010 Graz, Austria
| | - Martin R Kulterer
- Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstraße 28, 8010 Graz, Austria
| | - Matej Braćić
- Institute for the Engineering and Design of Materials, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Silvo Hribernik
- Institute for the Engineering and Design of Materials, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Karin Stana-Kleinschek
- Institute for the Engineering and Design of Materials, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Volker Ribitsch
- Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstraße 28, 8010 Graz, Austria
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43
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Ehmann HMA, Mohan T, Koshanskaya M, Scheicher S, Breitwieser D, Ribitsch V, Stana-Kleinschek K, Spirk S. Design of anticoagulant surfaces based on cellulose nanocrystals. Chem Commun (Camb) 2014; 50:13070-2. [DOI: 10.1039/c4cc05254d] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The anticoagulant activity of surfaces decorated with cellulose nanocrystals (CNCs) prepared via sulfuric acid hydrolysis, is explored.
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Affiliation(s)
- Heike M. A. Ehmann
- Institute for Chemistry and Technology of Materials
- Graz University of Technology
- 8010 Graz, Austria
| | | | | | - Sylvia Scheicher
- Joanneum Research Materials
- Institute for Surface Technologies and Photonics
- 8160 Weiz, Austria
| | | | | | - Karin Stana-Kleinschek
- Institute for the Engineering and Design of Materials
- University of Maribor
- 2000 Maribor, Slovenia
| | - Stefan Spirk
- Institute for Chemistry and Technology of Materials
- Graz University of Technology
- 8010 Graz, Austria
- Institute for the Engineering and Design of Materials
- University of Maribor
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44
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Bračič M, Mohan T, Kargl R, Griesser T, Hribernik S, Köstler S, Stana-Kleinschek K, Fras-Zemljič L. Preparation of PDMS ultrathin films and patterned surface modification with cellulose. RSC Adv 2014. [DOI: 10.1039/c3ra47380e] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Patterned surface functionalization of PDMS with the biopolymer cellulose via lithographic methods.
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Affiliation(s)
- Matej Bračič
- Institute for the Engineering and Design of Materials
- University of Maribor
- 2000 Maribor, Slovenia
- Savatech d.o.o. Industrial Rubber Products and Tyres
- 4000 Kranj, Slovenia
| | - Tamilselvan Mohan
- Institute for Chemistry and Technology of Materials
- Graz University of Technology
- 8010 Graz, Austria
| | - Rupert Kargl
- Institute for the Engineering and Design of Materials
- University of Maribor
- 2000 Maribor, Slovenia
| | - Thomas Griesser
- Chair of Chemistry of Polymeric Materials
- University of Leoben
- A-8700 Leoben, Austria
| | - Silvo Hribernik
- Institute for the Engineering and Design of Materials
- University of Maribor
- 2000 Maribor, Slovenia
| | - Stefan Köstler
- Joanneum Research Materials
- Institute for Surface Technologies and Photonics
- 8160 Weiz, Austria
| | - Karin Stana-Kleinschek
- Institute for the Engineering and Design of Materials
- University of Maribor
- 2000 Maribor, Slovenia
| | - Lidija Fras-Zemljič
- Institute for the Engineering and Design of Materials
- University of Maribor
- 2000 Maribor, Slovenia
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45
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Ehmann HMA, Spirk S, Doliška A, Mohan T, Gössler W, Ribitsch V, Sfiligoj-Smole M, Stana-Kleinschek K. Generalized indirect Fourier transformation as a valuable tool for the structural characterization of aqueous nanocrystalline cellulose suspensions by small angle X-ray scattering. Langmuir 2013; 29:3740-8. [PMID: 23428094 DOI: 10.1021/la303122b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Small angle X-ray scattering (SAXS) is employed to characterize the inner structure and shape of aqueous nanocrystalline cellulose suspensions using the generalized indirect Fourier transformation (GIFT). The use of the GIFT approach provides a single fitting procedure for the determination of intra- and interparticle interactions due to a simultaneous treatment of the form factor P(q) and the structure factor S(q). Moreover, GIFT allows for the determination of particle charges and polydispersity indices. As test material, aqueous nanocrystalline cellulose suspensions (aNCS) prepared by the H2SO4 route have been investigated and characterized (SAXS, dynamic light scattering, zeta potential).
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Affiliation(s)
- Heike M A Ehmann
- University Maribor, Faculty of Mechanical Engineering, Institute for Engineering Materials and Design, Laboratory for the Characterization and Processing of Polymers, Smetanova Ulica 17, 2000 Maribor, Slovenia
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46
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Mohan T, Ristić T, Kargl R, Doliska A, Köstler S, Ribitsch V, Marn J, Spirk S, Stana-Kleinschek K. Cationically rendered biopolymer surfaces for high protein affinity support matrices. Chem Commun (Camb) 2013; 49:11530-2. [DOI: 10.1039/c3cc46414h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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47
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Mohan T, Zarth CSP, Doliška A, Kargl R, Griesser T, Spirk S, Heinze T, Stana-Kleinschek K. Interactions of a cationic cellulose derivative with an ultrathin cellulose support. Carbohydr Polym 2012; 92:1046-53. [PMID: 23399127 DOI: 10.1016/j.carbpol.2012.10.026] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 10/07/2012] [Accepted: 10/10/2012] [Indexed: 11/19/2022]
Abstract
The adsorption behavior of cellulose-4-[N-methylammonium]butyrate chloride (CMABC) on two hydrophilic substrates is studied, namely nanometric cellulose model thin films and silicon dioxide substrates. The adsorption is quantified in dependence of electrolyte concentration and pH value using a quartz crystal microbalance with dissipation (QCM-D). In case of CMABC, at high ionic strengths (25-100 mM NaCl) high adsorption is observed at pH 7 (Δf(3): -15 to -17 Hz) while at lower ionic strengths (1-10 mM) less CMABC (Δf(3): -2 to -12 Hz) is deposited on the cellulose surfaces as indicated by the frequency changes using QCM-D. A change in pH value from 7 to 8 reveals an increase in adsorption. Atomic force microscopy shows that the coating of cellulose thin films with CMABC changes the morphology from a fibrillar to a particle like structure on the surface. The surface wettability with water increases with an increasing amount of CMABC on the surface compared to neat cellulose model films. At lower pH values (3 and 5), CMABC does not adsorb onto the cellulose model thin films. XPS is used to validate the results and to determine the nitrogen content of the surfaces. In addition, adsorption of CMABC onto another hydrophilic and negatively charged substrate, silicon dioxide coated quartz crystals, cannot be detected at different pH values and electrolyte concentrations as proven by QCM-D.
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Affiliation(s)
- Tamilselvan Mohan
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
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48
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Kargl R, Mohan T, Bračič M, Kulterer M, Doliška A, Stana-Kleinschek K, Ribitsch V. Adsorption of carboxymethyl cellulose on polymer surfaces: evidence of a specific interaction with cellulose. Langmuir 2012; 28:11440-11447. [PMID: 22759080 DOI: 10.1021/la302110a] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The adsorption of carboxymethyl cellulose (CMC), one of the most important cellulose derivatives, is crucial for many scientific investigations and industrial applications. Especially for surface modifications and functionalization of materials, the polymer is of interest. The adsorption properties of CMC are dependent not only on the solutions state, which can be influenced by the pH, temperature, and electrolyte concentration, but also on the chemical composition of the adsorbents. We therefore performed basic investigation studies on the interaction of CMC with a variety of polymer films. Thin films of cellulose, cellulose acetate, deacetylated cellulose acetate, polyethylene terephthalate, and cyclo olefin polymer were therefore prepared on sensors of a QCM-D (quartz crystal microbalance) and on silicon substrates. The films were characterized with respect to the thickness, wettability, and chemical composition. Subsequently, the interaction and deposition of CMC in a range of pH values without additional electrolyte were measured with the QCM-D method. A comparison of the QCM-D results showed that CMC is favorably deposited on pure cellulose films and deacetylated cellulose acetate at low pH values. Other hydrophilic surfaces such as silicon dioxide or polyvinyl alcohol coated surfaces did not adsorb CMC to a significant extent. Atomic force microcopy confirmed that the morphology of the adsorbed CMC layers differed depending on the substrate. On hydrophobic polymer films, CMC was deposited in the form of larger particles in lower amounts whereas hydrophilic cellulose substrates were to a high extent uniformly covered by adsorbed CMC. The chemical similarity of the CMC backbone seems to favor the irreversible adsorption of CMC when the molecule is almost uncharged at low pH values. A selectivity of the cellulose CMC interaction can therefore be assumed. All CMC treated polymer films exhibited an increased hydrophilicity, which confirmed their modification with the functional molecule.
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Affiliation(s)
- Rupert Kargl
- Institute of Chemistry, Karl-Franzens-University Graz, Graz, Austria.
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Mohan T, Kargl R, Köstler S, Doliška A, Findenig G, Ribitsch V, Stana-Kleinschek K. Functional polysaccharide conjugates for the preparation of microarrays. ACS Appl Mater Interfaces 2012; 4:2743-2751. [PMID: 22515932 DOI: 10.1021/am300375m] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A method for the immobilization of functional molecules on cellulose surfaces was developed. The irreversible deposition of the water-soluble polyelectrolyte carboxymethyl cellulose (CMC) on solid cellulose surfaces was used as a basis for this immobilization. CMC was modified using aminofluorescein (AMF) as a model compound for a functional molecule. The carbodiimide mediated coupling efficiency of AMF to CMC was studied in detail, and the functional conjugates were isolated. A quartz crystal microbalance with dissipation was employed to study the immobilization of the functionalized CMC onto cellulose model films in situ. The influence of the carbodiimide concentration, the degree of substitution, and the molecular weight of CMC on the immobilization process was investigated. Atomic force microscopy was used to characterize the changes in the surface morphology of the modified cellulose films. Finally, microspotted arrays of AMF-CMC conjugates were prepared with the knowledge obtained from the basic interaction studies. The successful deposition of AMF-CMC conjugates onto cellulose surfaces was proven by fluorescence microscopy. The conjugation of functional molecules to CMC and the subsequent deposition of these products on cellulose can be seen as a versatile method to immobilize these molecules for applications in the field of microarrays and other sensor surfaces. It offers the possibility to introduce new properties on a variety of cellulosic materials.
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Affiliation(s)
- Tamilselvan Mohan
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
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Mohan T, Spirk S, Kargl R, Doliška A, Ehmann HM, Köstler S, Ribitsch V, Stana-Kleinschek K. Watching cellulose grow – Kinetic investigations on cellulose thin film formation at the gas–solid interface using a quartz crystal microbalance with dissipation (QCM-D). Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.02.053] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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