1
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Coats JP, Cochereau R, Dinu IA, Messmer D, Sciortino F, Palivan CG. Trends in the Synthesis of Polymer Nano- and Microscale Materials for Bio-Related Applications. Macromol Biosci 2023; 23:e2200474. [PMID: 36949011 DOI: 10.1002/mabi.202200474] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [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: 11/06/2022] [Revised: 02/24/2023] [Indexed: 03/24/2023]
Abstract
Polymeric nano- and microscale materials bear significant potential in manifold applications related to biomedicine. This is owed not only to the large chemical diversity of the constituent polymers, but also to the various morphologies these materials can achieve, ranging from simple particles to intricate self-assembled structures. Modern synthetic polymer chemistry permits the tuning of many physicochemical parameters affecting the behavior of polymeric nano- and microscale materials in the biological context. In this Perspective, an overview of the synthetic principles underlying the modern preparation of these materials is provided, aiming to demonstrate how advances in and ingenious implementations of polymer chemistry fuel a range of applications, both present and prospective.
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Affiliation(s)
- John Peter Coats
- Department of Chemistry, Universitat Basel, Mattenstrasse 24a, Basel, CH-4058, Switzerland
| | - Rémy Cochereau
- Department of Chemistry, Universitat Basel, Mattenstrasse 24a, Basel, CH-4058, Switzerland
| | - Ionel Adrian Dinu
- Department of Chemistry, Universitat Basel, Mattenstrasse 24a, Basel, CH-4058, Switzerland
| | - Daniel Messmer
- Department of Chemistry, Universitat Basel, Mattenstrasse 24a, Basel, CH-4058, Switzerland
| | - Flavien Sciortino
- Department of Chemistry, Universitat Basel, Mattenstrasse 24a, Basel, CH-4058, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, Universitat Basel, Mattenstrasse 24a, Basel, CH-4058, Switzerland
- National Centre for Competence in Research - Molecular Systems Engineering, Mattenstrasse 24a, Basel, CH-4058, Switzerland
- Swiss Nanoscience Institute, Klingelbergstrasse 82, Basel, CH-4056, Switzerland
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2
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Angelini A, Car A, Dinu IA, Leva L, Yave W. Amphiphilic Poly(vinyl alcohol) Membranes Leaving Out Chemical Cross-Linkers: Design, Synthesis, and Function of Tailor-Made Poly(vinyl alcohol)-b-poly(styrene) Copolymers. Macromol Rapid Commun 2023; 44:e2200875. [PMID: 36628979 DOI: 10.1002/marc.202200875] [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: 11/08/2022] [Revised: 12/20/2022] [Indexed: 01/12/2023]
Abstract
Tailor-made poly(vinyl alcohol)-b-poly(styrene) copolymers (PVA-b-PS) for separation membranes are synthesized by the combination of reversible-deactivation radical polymerization techniques. The special features of these di-block copolymers are the high molecular weight (>70 kDa), the high PVA content (>80 wt%), and the good film-forming property. They are soluble only in hot dimethyl sulfoxide, but by the "solvent-switch" technique, they self-assemble in aqueous media to form micelles. When the self-assembled micelles are cast on a porous substrate, thin-film membranes with higher water permeance than that of PVA homopolymer are obtained. Thus, by using these tailor-made PVA-b-PS copolymers, it is demonstrated that chemical cross-linkers and acid catalysts can no longer be needed to produce PVA membranes, since the PS nanodomains within the PVA matrix act as cross-linking points. Lastly, subsequent thermal annealing of the thin film enhances the membrane selectivity due to the improved microphase separation.
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Affiliation(s)
- Alessandro Angelini
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4058, Switzerland
| | - Anja Car
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4058, Switzerland
| | - Ionel Adrian Dinu
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4058, Switzerland
| | - Luigi Leva
- Research and Development Department, DeltaMem AG, Hegenheimermattweg 125, Allschwil, 4123, Switzerland
| | - Wilfredo Yave
- Research and Development Department, DeltaMem AG, Hegenheimermattweg 125, Allschwil, 4123, Switzerland
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3
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Guinart A, Korpidou M, Doellerer D, Pacella G, Stuart MCA, Dinu IA, Portale G, Palivan C, Feringa BL. Synthetic molecular motor activates drug delivery from polymersomes. Proc Natl Acad Sci U S A 2023; 120:e2301279120. [PMID: 37364098 PMCID: PMC10319042 DOI: 10.1073/pnas.2301279120] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [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: 01/27/2023] [Accepted: 04/27/2023] [Indexed: 06/28/2023] Open
Abstract
The design of stimuli-responsive systems in nanomedicine arises from the challenges associated with the unsolved needs of current molecular drug delivery. Here, we present a delivery system with high spatiotemporal control and tunable release profiles. The design is based on the combination of an hydrophobic synthetic molecular rotary motor and a PDMS-b-PMOXA diblock copolymer to create a responsive self-assembled system. The successful incorporation and selective activation by low-power visible light (λ = 430 nm, 6.9 mW) allowed to trigger the delivery of a fluorescent dye with high efficiencies (up to 75%). Moreover, we proved the ability to turn on and off the responsive behavior on demand over sequential cycles. Low concentrations of photoresponsive units (down to 1 mol% of molecular motor) are shown to effectively promote release. Our system was also tested under relevant physiological conditions using a lung cancer cell line and the encapsulation of an Food and Drug Administration (FDA)-approved drug. Similar levels of cell viability are observed compared to the free given drug showing the potential of our platform to deliver functional drugs on request with high efficiency. This work provides an important step for the application of synthetic molecular machines in the next generation of smart delivery systems.
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Affiliation(s)
- Ainoa Guinart
- Faculty of Science and Engineering, Stratingh Institute for Chemistry, University of Groningen, 9747 AGGroningen, The Netherlands
| | - Maria Korpidou
- Department of Chemistry, University of Basel, BPR 1096, 4058Basel, Switzerland
| | - Daniel Doellerer
- Faculty of Science and Engineering, Stratingh Institute for Chemistry, University of Groningen, 9747 AGGroningen, The Netherlands
| | - Gianni Pacella
- Faculty of Science and Engineering, Zernike Institute for Advanced Materials, University of Groningen, 9747 AGGroningen, The Netherlands
| | - Marc C. A. Stuart
- Faculty of Science and Engineering, Stratingh Institute for Chemistry, University of Groningen, 9747 AGGroningen, The Netherlands
| | - Ionel Adrian Dinu
- Department of Chemistry, University of Basel, BPR 1096, 4058Basel, Switzerland
- National Centre of Competence in Research-Molecular Systems Engineering, BioPark Rosental 1095Basel, Switzerland
| | - Giuseppe Portale
- Faculty of Science and Engineering, Zernike Institute for Advanced Materials, University of Groningen, 9747 AGGroningen, The Netherlands
| | - Cornelia Palivan
- Department of Chemistry, University of Basel, BPR 1096, 4058Basel, Switzerland
- National Centre of Competence in Research-Molecular Systems Engineering, BioPark Rosental 1095Basel, Switzerland
- Swiss Nanoscience Institute, University of Basel, 4056Basel, Switzerland
| | - Ben L. Feringa
- Faculty of Science and Engineering, Stratingh Institute for Chemistry, University of Groningen, 9747 AGGroningen, The Netherlands
- Faculty of Science and Engineering, Zernike Institute for Advanced Materials, University of Groningen, 9747 AGGroningen, The Netherlands
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4
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Huang X, Hürlimann D, Spanke HT, Wu D, Skowicki M, Dinu IA, Dufresne ER, Palivan CG. Cell-Derived Vesicles with Increased Stability and On-Demand Functionality by Equipping Their Membrane with a Cross-Linkable Copolymer. Adv Healthc Mater 2022; 11:e2202100. [PMID: 36208079 DOI: 10.1002/adhm.202202100] [Citation(s) in RCA: 1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Indexed: 01/28/2023]
Abstract
Cell-derived vesicles retain the cytoplasm and much of the native cell membrane composition. Therefore, they are attractive for investigations of membrane biophysics, drug delivery systems, and complex molecular factories. However, their fragility and aggregation limit their applications. Here, the mechanical properties and stability of giant plasma membrane vesicles (GPMVs) are enhanced by decorating them with a specifically designed diblock copolymer, cholesteryl-poly[2-aminoethyl methacrylate-b-poly(ethylene glycol) methyl ether acrylate]. When cross-linked, this polymer brush enhances the stability of the GPMVs. Furthermore, the pH-responsiveness of the copolymer layer allows for a controlled cargo loading/release, which may enable various bioapplications. Importantly, the cross-linked-copolymer GPMVs are not cytotoxic and preserve in vitro membrane integrity and functionality. This effective strategy to equip the cell-derived vesicles with stimuli-responsive cross-linkable copolymers is expected to open a new route to the stabilization of natural membrane systems and overcome barriers to biomedical applications.
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Affiliation(s)
- Xinan Huang
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, Basel, 4058, Switzerland
| | - Dimitri Hürlimann
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, Basel, 4058, Switzerland.,NCCR-Molecular Systems Engineering, BPR1095, Mattenstrasse 24a, Basel, 4058, Switzerland
| | - Hendrik T Spanke
- Laboratory for Soft and Living Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zurich, 8093, Switzerland
| | - Dalin Wu
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, Basel, 4058, Switzerland
| | - Michal Skowicki
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, Basel, 4058, Switzerland.,NCCR-Molecular Systems Engineering, BPR1095, Mattenstrasse 24a, Basel, 4058, Switzerland
| | - Ionel Adrian Dinu
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, Basel, 4058, Switzerland.,NCCR-Molecular Systems Engineering, BPR1095, Mattenstrasse 24a, Basel, 4058, Switzerland
| | - Eric R Dufresne
- Laboratory for Soft and Living Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zurich, 8093, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, Basel, 4058, Switzerland.,NCCR-Molecular Systems Engineering, BPR1095, Mattenstrasse 24a, Basel, 4058, Switzerland
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5
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Muthwill MS, Kong P, Dinu IA, Necula D, John C, Palivan CG. Tailoring Polymer-Based Nanoassemblies for Stimuli-Responsive Theranostic Applications. Macromol Biosci 2022; 22:e2200270. [PMID: 36100461 DOI: 10.1002/mabi.202200270] [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: 06/30/2022] [Revised: 08/28/2022] [Indexed: 12/25/2022]
Abstract
Polymer assemblies on the nanoscale represent a powerful toolbox for the design of theranostic systems when combined with both therapeutic compounds and diagnostic reporting ones. Here, recent advances in the design of theranostic systems for various diseases, containing-in their architecture-either polymers or polymer assemblies as one of the building blocks are presented. This review encompasses the general principles of polymer self-assembly, from the production of adequate copolymers up to supramolecular assemblies with theranostic functionality. Such polymer nanoassemblies can be further tailored through the incorporation of inorganic nanoparticles to endow them with multifunctional therapeutic and/or diagnostic features. Systems that change their architecture or properties in the presence of stimuli are selected, as responsivity to changes in the environment is a key factor for enhancing efficiency. Such theranostic systems are based on the intrinsic properties of copolymers or one of the other components. In addition, systems with a more complex architecture, such as multicompartments, are presented. Selected systems indicate the advantages of such theranostic approaches and provide a basis for further developments in the field.
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Affiliation(s)
- Moritz S Muthwill
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4058, Switzerland.,NCCR-Molecular Systems Engineering, Mattenstrasse 24a, BPR 1095, Basel, 4058, Switzerland
| | - Phally Kong
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4058, Switzerland
| | - Ionel Adrian Dinu
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4058, Switzerland
| | - Danut Necula
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4058, Switzerland
| | - Christoph John
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4058, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4058, Switzerland.,NCCR-Molecular Systems Engineering, Mattenstrasse 24a, BPR 1095, Basel, 4058, Switzerland
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6
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Dinu IA, Ghimici L, Raschip IE. Macroporous 3D Chitosan Cryogels for Fastac 10EC Pesticide Adsorption and Antibacterial Applications. Polymers (Basel) 2022; 14:polym14153145. [PMID: 35956660 PMCID: PMC9370839 DOI: 10.3390/polym14153145] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 07/28/2022] [Accepted: 07/29/2022] [Indexed: 02/01/2023] Open
Abstract
The pesticide pollution of surface water and wastewater has been recognized as a major worldwide concern due to their persistence in the aquatic environment and the potential adverse effects on human, flora, and fauna health. Apart from pesticides, bio-contamination with various bacterial populations leads to waterborne diseases. Hence, it becomes vital to remove the above-mentioned pollutants from water using a suitable process. Consequently, our study emphasized the potential benefits of a highly porous, chemically cross-linked 3D chitosan (CSGA) cryogel in the removal of pesticides and bacteria. The CSGA sponges were prepared using a facile and cost-effective approach that consisted of a three-step cryogenic process: (i) freezing at −18 °C, (ii) storage in a frozen state for a certain period, and (iii) thawing at room temperature. Batch adsorption experiments were performed under different environments, where the effects of several parameters, such as pH, contact time, and initial pollutant concentration were evaluated to identify the appropriate adsorption conditions for maximum pesticide removal. The CSGA-based cryogel sponges exhibited a theoretical maximum adsorption capacity of 160.82 mg g−1 for the Fastac 10EC pesticide and very good recyclability at room temperature. In addition, the antibacterial activities of these sponges were also investigated against various bacterial pathogens. The rates of killing Escherichia coli, Listeria monocytogenes, and Staphylococcus aureus were close to 82%, 100%, and 99%, respectively. These results demonstrated that CSGA cryogels could be efficiently used in water remediation and find applications in the removal of pesticides and disinfection.
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7
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Korpidou M, Maffeis V, Dinu IA, Schoenenberger CA, Meier WP, Palivan CG. Inverting glucuronidation of hymecromone in situ by catalytic nanocompartments. J Mater Chem B 2022; 10:3916-3926. [PMID: 35485215 DOI: 10.1039/d2tb00243d] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Glucuronidation is a metabolic pathway that inactivates many drugs including hymecromone. Adverse effects of glucuronide metabolites include a reduction of half-life circulation times and rapid elimination from the body. Herein, we developed synthetic catalytic nanocompartments able to cleave the glucuronide moiety from the metabolized form of hymecromone in order to convert it to the active drug. By shielding enzymes from their surroundings, catalytic nanocompartments favor prolonged activity and lower immunogenicity as key aspects to improve the therapeutic solution. The catalytic nanocompartments (CNCs) consist of self-assembled poly(dimethylsiloxane)-block-poly(2-methyl-2-oxazoline) diblock copolymer polymersomes encapsulating β-glucuronidase. Insertion of melittin in the synthetic membrane of these polymersomes provided pores for the diffusion of the hydrophilic hymecromone-glucuronide conjugate to the compartment inside where the encapsulated β-glucuronidase catalyzed its conversion to hymecromone. Our system successfully produced hymecromone from its glucuronide conjugate in both phosphate buffered solution and cell culture medium. CNCs were non-cytotoxic when incubated with HepG2 cells. After being taken up by cells, CNCs produced the drug in situ over 24 hours. Such catalytic platforms, which locally revert a drug metabolite into its active form, open new avenues in the design of therapeutics that aim at prolonging the residence time of a drug.
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Affiliation(s)
- Maria Korpidou
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058, Basel, Switzerland.
| | - Viviana Maffeis
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058, Basel, Switzerland. .,NCCR-Molecular Systems Engineering, Mattenstrasse 24a, BPR 1095, 4058, Basel, Switzerland
| | - Ionel Adrian Dinu
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058, Basel, Switzerland. .,NCCR-Molecular Systems Engineering, Mattenstrasse 24a, BPR 1095, 4058, Basel, Switzerland
| | - Cora-Ann Schoenenberger
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058, Basel, Switzerland. .,NCCR-Molecular Systems Engineering, Mattenstrasse 24a, BPR 1095, 4058, Basel, Switzerland
| | - Wolfgang P Meier
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058, Basel, Switzerland. .,NCCR-Molecular Systems Engineering, Mattenstrasse 24a, BPR 1095, 4058, Basel, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058, Basel, Switzerland. .,NCCR-Molecular Systems Engineering, Mattenstrasse 24a, BPR 1095, 4058, Basel, Switzerland
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8
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Zartner L, Maffeis V, Schoenenberger CA, Dinu IA, Palivan CG. Membrane protein channels equipped with a cleavable linker for inducing catalysis inside nanocompartments. J Mater Chem B 2021; 9:9012-9022. [PMID: 34623367 PMCID: PMC8580015 DOI: 10.1039/d1tb01463c] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 10/01/2021] [Indexed: 11/25/2022]
Abstract
Precisely timed initiation of reactions and stability of the catalysts are fundamental in catalysis. We introduce here an efficient closing-opening method for nanocompartments that contain sensitive catalysts and so achieve a controlled and extended catalytic activity. We developed a chemistry-oriented approach for modifying a pore-forming membrane protein which allows for a stimuli-responsive pore opening within the membrane of polymeric nanocompartments. We synthesized a diol-containing linker that selectively binds to the pores, blocking them completely. In the presence of an external stimulus (periodate), the linker is cleaved allowing the diffusion of substrate through the pores to the nanocompartment interior where it sets off the in situ enzymatic reaction. Besides the precise initiation of catalytic activity by opening of the pores, oxidation by periodate guarantees the cleavage of the linker under mild conditions. Accordingly, this kind of responsive nanocompartment lends itself to harboring a large variety of sensitive catalysts such as proteins and enzymes.
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Affiliation(s)
- Luisa Zartner
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, 4058 Basel, Switzerland.
| | - Viviana Maffeis
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, 4058 Basel, Switzerland.
- NCCR-Molecular Systems Engineering, BPR1095, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Cora-Ann Schoenenberger
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, 4058 Basel, Switzerland.
- NCCR-Molecular Systems Engineering, BPR1095, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Ionel Adrian Dinu
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, 4058 Basel, Switzerland.
- NCCR-Molecular Systems Engineering, BPR1095, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel, BPR1096, Mattenstrasse 24a, 4058 Basel, Switzerland.
- NCCR-Molecular Systems Engineering, BPR1095, Mattenstrasse 24a, 4058 Basel, Switzerland
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Angelini A, Fodor C, Leva L, Car A, Dinu IA, Yave W, Meier W. Synthesis and characterization of tailor‐made
N
‐vinylpyrrolidone copolymers and their blend membranes with polyvinyl alcohol for bioethanol dehydration by pervaporation. J Appl Polym Sci 2021. [DOI: 10.1002/app.51562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Csaba Fodor
- Department of Chemistry University of Basel Basel Switzerland
| | - Luigi Leva
- Research and Development Department DeltaMem AG Allschwill Switzerland
| | - Anja Car
- Department of Chemistry University of Basel Basel Switzerland
| | | | - Wilfredo Yave
- Research and Development Department DeltaMem AG Allschwill Switzerland
| | - Wolfgang Meier
- Department of Chemistry University of Basel Basel Switzerland
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10
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Dinu MV, Gradinaru AC, Lazar MM, Dinu IA, Raschip IE, Ciocarlan N, Aprotosoaie AC. Physically cross-linked chitosan/dextrin cryogels entrapping Thymus vulgaris essential oil with enhanced mechanical, antioxidant and antifungal properties. Int J Biol Macromol 2021; 184:898-908. [PMID: 34157333 DOI: 10.1016/j.ijbiomac.2021.06.068] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 05/18/2021] [Accepted: 06/10/2021] [Indexed: 12/27/2022]
Abstract
Herein, we entrapped Thymus vulgaris essential oil (EO) within the physically cross-linked sponge-like architecture of cryogels by ice template-assisted freeze-drying. Their 3D cryogenically-structured network was built through hydrogen bonding formed by blending two naturally-derived polysaccharides, chitosan and dextrin. The embedment of EOs within the cryogel matrix generates porous films with an increased elasticity that allows their fast shape recovery after full compression. Thus, the swollen EOs-loaded cryogel films exhibited an elastic modulus of 3.00 MPa, which is more than 40 times higher than that of polysaccharide films without EOs (an elastic modulus of only 0.07 MPa). In addition, the encapsulation of bioactive compounds endows the bio-based films with both antioxidant and antifungal properties, showing a radical scavenging activity of 65% and a zone inhibition diameter of 40 mm for Candida parapsilosis fungi. Our results recommend the entrapment of EOs into bio-based cryogel carriers as a straightforward approach to provide 'green' polysaccharide-based films having both improved physicochemical properties and remarkable antifungal activity.
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Affiliation(s)
- Maria Valentina Dinu
- "Petru Poni" Institute of Macromolecular Chemistry, Department of Functional Polymers, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania.
| | - Adina Catinca Gradinaru
- "Grigore T. Popa" University of Medicine and Pharmacy, Universitatii Street 16, Iasi 700115, Romania
| | - Maria Marinela Lazar
- "Petru Poni" Institute of Macromolecular Chemistry, Department of Functional Polymers, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania
| | - Ionel Adrian Dinu
- "Petru Poni" Institute of Macromolecular Chemistry, Department of Functional Polymers, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania; University of Basel, Department of Chemistry, BioPark Rosental (BPR) 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
| | - Irina Elena Raschip
- "Petru Poni" Institute of Macromolecular Chemistry, Department of Functional Polymers, Grigore Ghica Voda Alley 41A, Iasi 700487, Romania
| | - Nina Ciocarlan
- Botanical Garden, Academy of Sciences of Moldova, Padurii Street 18, 2002, Chisinau, Republic of Moldova
| | - Ana Clara Aprotosoaie
- "Grigore T. Popa" University of Medicine and Pharmacy, Universitatii Street 16, Iasi 700115, Romania
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11
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Sáez P, Dinu IA, Rodríguez A, Gómez JM, Lazar MM, Rossini D, Dinu MV. Composite cryo-beads of chitosan reinforced with natural zeolites with remarkable elasticity and switching on/off selectivity for heavy metal ions. Int J Biol Macromol 2020; 164:2432-2449. [DOI: 10.1016/j.ijbiomac.2020.08.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 07/31/2020] [Accepted: 08/02/2020] [Indexed: 02/06/2023]
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12
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Chimisso V, Aleman Garcia MA, Yorulmaz Avsar S, Dinu IA, Palivan CG. Design of Bio-Conjugated Hydrogels for Regenerative Medicine Applications: From Polymer Scaffold to Biomolecule Choice. Molecules 2020; 25:E4090. [PMID: 32906772 PMCID: PMC7571016 DOI: 10.3390/molecules25184090] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 08/28/2020] [Accepted: 09/04/2020] [Indexed: 12/26/2022] Open
Abstract
Bio-conjugated hydrogels merge the functionality of a synthetic network with the activity of a biomolecule, becoming thus an interesting class of materials for a variety of biomedical applications. This combination allows the fine tuning of their functionality and activity, whilst retaining biocompatibility, responsivity and displaying tunable chemical and mechanical properties. A complex scenario of molecular factors and conditions have to be taken into account to ensure the correct functionality of the bio-hydrogel as a scaffold or a delivery system, including the polymer backbone and biomolecule choice, polymerization conditions, architecture and biocompatibility. In this review, we present these key factors and conditions that have to match together to ensure the correct functionality of the bio-conjugated hydrogel. We then present recent examples of bio-conjugated hydrogel systems paving the way for regenerative medicine applications.
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Affiliation(s)
| | | | | | | | - Cornelia G. Palivan
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR-1096, 4058 Basel, Switzerland; (V.C.); (M.A.A.G.); (S.Y.A.); (I.A.D.)
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13
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Dinu MV, Dinu IA, Saxer SS, Meier W, Pieles U, Bruns N. Stabilizing Enzymes within Polymersomes by Coencapsulation of Trehalose. Biomacromolecules 2020; 22:134-145. [PMID: 32567847 DOI: 10.1021/acs.biomac.0c00824] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Enzymes are essential biocatalysts and very attractive as therapeutics. However, their functionality is strictly related to their stability, which is significantly affected by the environmental changes occurring during their usage or long-term storage. Therefore, maintaining the activity of enzymes is essential when they are exposed to high temperature during usage or when they are stored for extended periods of time. Here, we stabilize and protect enzymes by coencapsulating them with trehalose into polymersomes. The anhydrobiotic disaccharide preserved up to about 81% of the enzyme's original activity when laccase/trehalose-loaded nanoreactors were kept desiccated for 2 months at room temperature and 75% of its activity when heated at 50 °C for 3 weeks. Moreover, the applicability of laccase/trehalose-loaded nanoreactors as catalysts for bleaching of the textile dyes orange G, toluidine blue O, and indigo was proven. Our results demonstrate the advantages of coencapsulating trehalose within polymersomes to stabilize enzymes in dehydrated state for extended periods of time, preserving their activity even when heated to elevated temperature.
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Affiliation(s)
- Maria Valentina Dinu
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland.,Department of Functional Polymers, "Petru Poni" Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41 A, 700487 Iasi, Romania
| | - Ionel Adrian Dinu
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland.,Department of Functional Polymers, "Petru Poni" Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41 A, 700487 Iasi, Romania
| | - Sina S Saxer
- Institute for Chemistry and Bioanalytics, School of Life Sciences, University of Applied Sciences and Arts Northwestern Switzerland, 4132 Muttenz, Switzerland
| | - Wolfgang Meier
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
| | - Uwe Pieles
- Institute for Chemistry and Bioanalytics, School of Life Sciences, University of Applied Sciences and Arts Northwestern Switzerland, 4132 Muttenz, Switzerland
| | - Nico Bruns
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland.,Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, U.K
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Zartner L, Muthwill MS, Dinu IA, Schoenenberger CA, Palivan CG. The rise of bio-inspired polymer compartments responding to pathology-related signals. J Mater Chem B 2020; 8:6252-6270. [PMID: 32452509 DOI: 10.1039/d0tb00475h] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Self-organized nano- and microscale polymer compartments such as polymersomes, giant unilamellar vesicles (GUVs), polyion complex vesicles (PICsomes) and layer-by-layer (LbL) capsules have increasing potential in many sensing applications. Besides modifying the physicochemical properties of the corresponding polymer building blocks, the versatility of these compartments can be markedly expanded by biomolecules that endow the nanomaterials with specific molecular and cellular functions. In this review, we focus on polymer-based compartments that preserve their structure, and highlight the key role they play in the field of medical diagnostics: first, the self-assembling abilities that result in preferred architectures are presented for a broad range of polymers. In the following, we describe different strategies for sensing disease-related signals (pH-change, reductive conditions, and presence of ions or biomolecules) by polymer compartments that exhibit stimuli-responsiveness. In particular, we distinguish between the stimulus-sensitivity contributed by the polymer itself or by additional compounds embedded in the compartments in different sensing systems. We then address necessary properties of sensing polymeric compartments, such as the enhancement of their stability and biocompatibility, or the targeting ability, that open up new perspectives for diagnostic applications.
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Affiliation(s)
- Luisa Zartner
- Chemistry Department, University of Basel, Mattenstr. 24a, BPR1096, Basel, Switzerland.
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Humelnicu D, Lazar MM, Ignat M, Dinu IA, Dragan ES, Dinu MV. Removal of heavy metal ions from multi-component aqueous solutions by eco-friendly and low-cost composite sorbents with anisotropic pores. J Hazard Mater 2020; 381:120980. [PMID: 31442692 DOI: 10.1016/j.jhazmat.2019.120980] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 08/06/2019] [Accepted: 08/07/2019] [Indexed: 05/28/2023]
Abstract
Copper, nickel, zinc, chromium, and iron ions are the prevailing contaminants in the aqueous effluents resulting from the photo-etching industry. In this context, we investigate here the metal ion sorption performance of an ion-imprinted cryogel (IIC), consisting of low-cost materials coming from renewable resources, towards multi-component metal ion solutions. The IIC sorbent, which is based on a chitosan matrix embedding a natural zeolite, was synthesized using a straightforward strategy by coupling copper-imprinting and unidirectional ice-templating methods. As consequence, the 1D-orientation and the interconnectivity of flow-channels sustain the fast metal ion diffusion within the IIC anisotropic structure. The removal efficiency of IIC sorbent reached 50% after 30 min, and the sorption equilibrium was attained within 150 min. For assessing the successful formation of imprinted cavities with well-defined sizes controlled by the radius of copper ions used as template, selectivity studies were performed on binary, ternary, and five-component synthetic mixtures. The efficiency of IIC as sorbent was further evaluated on real-life aqueous effluents discharged from photo-etching processes; thus, an IIC dosage of 6 g L-1 was found to remove 98.89% of Cu2+, 94.56% of Fe3+, 91.67% of Ni2+, 92.24% of Zn2+, and 82.76% of Cr3+ ions from this type of industrial wastewaters.
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Affiliation(s)
- Doina Humelnicu
- "Al. I. Cuza" University of Iasi, Faculty of Chemistry, Carol I Bd. 11, 700506 Iasi, Romania
| | - Maria Marinela Lazar
- "Petru Poni" Institute of Macromolecular Chemistry, "Mihai Dima" Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania
| | - Maria Ignat
- "Al. I. Cuza" University of Iasi, Faculty of Chemistry, Carol I Bd. 11, 700506 Iasi, Romania; "Petru Poni" Institute of Macromolecular Chemistry, "Mihai Dima" Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania
| | - Ionel Adrian Dinu
- "Petru Poni" Institute of Macromolecular Chemistry, "Mihai Dima" Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania
| | - Ecaterina Stela Dragan
- "Petru Poni" Institute of Macromolecular Chemistry, "Mihai Dima" Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania
| | - Maria Valentina Dinu
- "Petru Poni" Institute of Macromolecular Chemistry, "Mihai Dima" Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania.
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Lazar MM, Dinu IA, Silion M, Dragan ES, Dinu MV. Could the porous chitosan-based composite materials have a chance to a "NEW LIFE" after Cu(II) ion binding? Int J Biol Macromol 2019; 131:134-146. [PMID: 30857965 DOI: 10.1016/j.ijbiomac.2019.03.055] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [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: 11/01/2018] [Revised: 03/03/2019] [Accepted: 03/07/2019] [Indexed: 10/27/2022]
Abstract
Currently, biosorption is considered a leading-edge environmentally-friendly method for the low-cost remediation of wastewaters contaminated with metal ions. However, the safe disposal of metal-loaded biosorbents is still a challenging issue. In this context, our major objective was to explore the possibility of "waste minimization" by reusing the metal-loaded biosorbents in further environmental applications, particularly into the oxidative catalysis of dyes. Thus, the decolourisation efficiency (DE) of Methyl Orange (MO) in aqueous solutions under ambient light using copper-imprinted chitosan-based composites in comparison to non-imprinted ones was investigated in this work. The MO degradation was established first in the absence of any co-catalyst, when a DE value of 95.3% was achieved by the ion-imprinted catalysts within 360 min of reaction, compared to only 67.4% attained by the non-imprinted ones. Under Fenton-like conditions, the apparent degradation rate constant was seventy times higher, the DE increasing within 40 min to about 98.6%, and 70.5% respectively, whereas the content of co-catalyst (H2O2) was significantly lowered compared to other reported studies. The straightforward preparation of copper-loaded composites, along with their excellent stability and high efficiency even after four consecutive reaction runs support our ion-imprinted systems as potential catalysts for dye removal by oxidative decolourisation treatments.
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Affiliation(s)
- Maria Marinela Lazar
- "Petru Poni" Institute of Macromolecular Chemistry, Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania
| | - Ionel Adrian Dinu
- "Petru Poni" Institute of Macromolecular Chemistry, Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania
| | - Mihaela Silion
- "Petru Poni" Institute of Macromolecular Chemistry, Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania
| | - Ecaterina Stela Dragan
- "Petru Poni" Institute of Macromolecular Chemistry, Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania
| | - Maria Valentina Dinu
- "Petru Poni" Institute of Macromolecular Chemistry, Department of Functional Polymers, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania.
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Ghimici L, Dinu IA. Removal of some commercial pesticides from aqueous dispersions using as flocculant a thymine-containing chitosan derivative. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.09.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Einfalt T, Goers R, Dinu IA, Najer A, Spulber M, Onaca-Fischer O, Palivan CG. Correction to Stimuli-Triggered Activity of Nanoreactors by Biomimetic Engineering Polymer Membranes. Nano Lett 2016; 16:823. [PMID: 26647315 DOI: 10.1021/acs.nanolett.5b04911] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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Einfalt T, Goers R, Dinu IA, Najer A, Spulber M, Onaca-Fischer O, Palivan CG. Stimuli-Triggered Activity of Nanoreactors by Biomimetic Engineering Polymer Membranes. Nano Lett 2015; 15:7596-7603. [PMID: 26428033 DOI: 10.1021/acs.nanolett.5b03386] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The development of advanced stimuli-responsive systems for medicine, catalysis, or technology requires compartmentalized reaction spaces with triggered activity. Only very few stimuli-responsive systems preserve the compartment architecture, and none allows a triggered activity in situ. We present here a biomimetic strategy to molecular transmembrane transport by engineering synthetic membranes equipped with channel proteins so that they are stimuli-responsive. Nanoreactors with triggered activity were designed by simultaneously encapsulating an enzyme inside polymer compartments, and inserting protein "gates" in the membrane. The outer membrane protein F (OmpF) porin was chemically modified with a pH-responsive molecular cap to serve as "gate" producing pH-driven molecular flow through the membrane and control the in situ enzymatic activity. This strategy provides complex reaction spaces necessary in "smart" medicine and for biomimetic engineering of artificial cells.
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Affiliation(s)
- Tomaž Einfalt
- Department of Chemistry, University of Basel , Klingelbergstrasse 80 CH-4056 Basel, Switzerland
| | - Roland Goers
- Department of Chemistry, University of Basel , Klingelbergstrasse 80 CH-4056 Basel, Switzerland
- Department of Biosystems Science and Engineering, ETH Zürich , CH-4058 Basel, Switzerland
| | - Ionel Adrian Dinu
- Department of Chemistry, University of Basel , Klingelbergstrasse 80 CH-4056 Basel, Switzerland
| | - Adrian Najer
- Department of Chemistry, University of Basel , Klingelbergstrasse 80 CH-4056 Basel, Switzerland
| | - Mariana Spulber
- Department of Chemistry, University of Basel , Klingelbergstrasse 80 CH-4056 Basel, Switzerland
| | - Ozana Onaca-Fischer
- Department of Chemistry, University of Basel , Klingelbergstrasse 80 CH-4056 Basel, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel , Klingelbergstrasse 80 CH-4056 Basel, Switzerland
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Lomora M, Dinu IA, Itel F, Rigo S, Spulber M, Palivan CG. Does Membrane Thickness Affect the Transport of Selective Ions Mediated by Ionophores in Synthetic Membranes? Macromol Rapid Commun 2015; 36:1929-1934. [DOI: 10.1002/marc.201500289] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Revised: 07/30/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Mihai Lomora
- Department of Chemistry; University of Basel; Klingelbergstrasse 80 4056 Basel Switzerland
| | - Ionel Adrian Dinu
- Department of Chemistry; University of Basel; Klingelbergstrasse 80 4056 Basel Switzerland
| | - Fabian Itel
- Department of Chemistry; University of Basel; Klingelbergstrasse 80 4056 Basel Switzerland
| | - Serena Rigo
- Department of Chemistry; University of Basel; Klingelbergstrasse 80 4056 Basel Switzerland
| | - Mariana Spulber
- Department of Chemistry; University of Basel; Klingelbergstrasse 80 4056 Basel Switzerland
| | - Cornelia G. Palivan
- Department of Chemistry; University of Basel; Klingelbergstrasse 80 4056 Basel Switzerland
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Abstract
Biomimetic polymersomes with an ion-selective membrane were successfully engineered by insertion of ionomycin, without affecting their final architecture.
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Affiliation(s)
- Mihai Lomora
- Department of Chemistry
- University of Basel
- CH-4056 Basel
- Switzerland
| | - Fabian Itel
- Department of Chemistry
- University of Basel
- CH-4056 Basel
- Switzerland
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Abstract
Stimulus-sensitive systems at the nanoscale represent ideal candidates for improving therapeutic and diagnostic approaches by producing rapid responses to the presence of specific molecules or conditions either by changing properties or by acting "on demand". Here we introduce an optimized light-sensitive nanoreactor based on encapsulation of a photosensitizer inside polymer vesicles to serve as an efficient source of reactive oxygen species (ROS) "on demand". Two types of amphiphilic block copolymers, poly(2-methyloxazoline)-block-poly(dimethylsiloxane)-block-poly(2-methyloxazoline), PMOXA-PDMS-PMOXA, and poly(N-vinylpyrrolidone)-block-poly(dimethylsiloxane)-block-poly(N-vinylpyrrolidone), PNVP-PDMS-PNVP, were used to encapsulate Rose Bengal-bovine serum albumin (RB-BSA) inside the cavity of vesicles. The difference of copolymers molecular properties (hydrophobic to hydrophilic ratio, different chemical nature of the hydrophilic block) influenced the encapsulation ability, and uptake by cells, allowing therefore a selection of the most efficient polymer system. Nanoreactors were optimized in terms of (i) size, (ii) stability, and (iii) encapsulation efficiency based on a combination of light scattering, TEM, and UV-vis spectroscopy. By illumination, encapsulated RB-BSA conjugates generated in situ ROS, which diffused through the polymer membrane to the environment of the vesicles, as proved by electron spin resonance spectroscopy (ESR). Optimum illumination conditions were obtained based on the effect of the illumination time on the amount of ROS produced in situ by the encapsulated RB-BSA conjugates. ROS diffusion monitored by ESR was dependent on the molecular weight of copolymer that influences the thickness of the polymer membrane. Upon uptake into HeLa cells our nontoxic nanoreactors acted as a Trojan horse: they produced illumination-controlled ROS in sufficient amounts to induce cell death under photodynamic therapy (PDT) conditions. Straightforward production, stability, and Trojan horse activity inside cells support our light-sensitive nanoreactors for medical applications which require ROS to be generated with precise time and space control.
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Affiliation(s)
- Patric Baumann
- Chemistry Department, University of Basel , Klingelbergstrasse 80, Basel, Switzerland
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Alton G, Taghaddos S, Joffe AR, Robertson CM, Sauve R, Dinu IA. 127: Prediction of Functional Outcomes at 4.5 Years of Age After Complex Cardiac Surgery. Paediatr Child Health 2014. [DOI: 10.1093/pch/19.6.e35-125] [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: 11/12/2022] Open
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Guerra GG, Robertson CM, Alton GY, Joffe AR, Moez EK, Dinu IA, Sauve R, Ross DB, Rebeyka IM, Lequier L. 200: Health Related Quality of Life in Pediatric Cardiac ECLS Survivors: Is Alive Good Enough? Paediatr Child Health 2014. [DOI: 10.1093/pch/19.6.e35-195] [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: 11/12/2022] Open
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Affiliation(s)
- Justyna Kowal
- Chemistry Department, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Xiaoyan Zhang
- Chemistry Department, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Ionel Adrian Dinu
- Chemistry Department, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Cornelia G. Palivan
- Chemistry Department, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Wolfgang Meier
- Chemistry Department, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland
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Dinu MV, Schwarz S, Dinu IA, Drăgan ES. Comparative rheological study of ionic semi-IPN composite hydrogels based on polyacrylamide and dextran sulphate and of polyacrylamide hydrogels. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2699-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Dragan ES, Dinu IA, Mihai M. Conformational changes of strong polycations in the presence of divalent counterions and their influence upon the flocculation efficiency. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2009.07.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Dragan ES, Dinu IA. Interaction of dis-azo dyes with quaternized poly(dimethylaminoethyl methacrylate) as a function of the dye structure and polycation charge density. J Appl Polym Sci 2009. [DOI: 10.1002/app.29474] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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