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Valachová K, Hassan ME, Šoltés L. Hyaluronan: Sources, Structure, Features and Applications. Molecules 2024; 29:739. [PMID: 38338483 PMCID: PMC10856924 DOI: 10.3390/molecules29030739] [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: 12/06/2023] [Revised: 01/28/2024] [Accepted: 02/01/2024] [Indexed: 02/12/2024] Open
Abstract
Hyaluronan (HA) is a non-sulfated glycosaminoglycan that is present in a variety of body tissues and organs. Hyaluronan has a wide range of biological activities that are frequently influenced by molar mass; however, they also depend greatly on the source, purity, and kind of impurities in hyaluronan. High-molar-mass HA has anti-inflammatory, immunosuppressive, and antiangiogenic properties, while low-molar-mass HA has opposite properties. A number of chemical modifications have been performed to enhance the stability of HA and its applications in medical practice. Hyaluronan is widely applied in medicine, such as viscosupplementation, ophthalmology, otolaryngology, wound healing, cosmetics, and drug delivery. In this review, we summarized several medical applications of polymers based on the hyaluronan backbone.
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Affiliation(s)
- Katarína Valachová
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia
| | - Mohamed E. Hassan
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia
- Centre of Excellence, Encapsulation & Nanobiotechnology Group, Chemistry of Natural and Microbial Products Department, National Research Centre, El Behouth Street, Cairo 12622, Egypt
| | - Ladislav Šoltés
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia
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Valachová K, Švík K, Jurčík R, Ondruška Ľ, Biró C, Šoltés L. Enhanced healing of skin wounds in ischemic rabbits using chitosan/hyaluronan/edaravone composite membranes: effects of laponite, carbon and silver-plated carbon nanofiber fillers. Chem Pap 2023. [DOI: 10.1007/s11696-022-02553-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Valachová K, El Meligy MA, Šoltés L. Hyaluronic acid and chitosan-based electrospun wound dressings: Problems and solutions. Int J Biol Macromol 2022; 206:74-91. [PMID: 35218807 DOI: 10.1016/j.ijbiomac.2022.02.117] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [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: 11/22/2021] [Revised: 02/16/2022] [Accepted: 02/18/2022] [Indexed: 11/05/2022]
Abstract
To date, available review papers related to the electrospinning of biopolymers including polysaccharides for wound healing were focused on summarizing the process conditions for two candidates, namely chitosan and hyaluronic acid. However, most reviews lack the discussion of problems of hyaluronan and chitosan electrospun nanofibers for wound dressing applications. For this reason, it is required to update information by providing a comprehensive overview of all factors which may play a role in the electrospinning of hyaluronic acid and chitosan for applications of wound dressings. This review summarizes the fabricated chitosan and hyaluronic acid electrospun nanofibers as wound dressings in the last years, including methods of preparations of nanofibers and challenges for the electrospinning of both pure chitosan and hyaluronic acid and strategies how to overcome the existing difficulties. Moreover, in this review the biological roles and mechanisms of chitosan and hyaluronic acid in the wound healing process are explained including the advantages of nanofibers for ideal wound management using the common solvents, copolymers enhancing spinning process, and the most biologically active incorporated substances thereby providing drug delivery in wound healing.
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Affiliation(s)
- Katarína Valachová
- Centre of Experimental Medicine of Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia.
| | - Mahmoud Atya El Meligy
- Department of Chemistry, Polymer Research Group, Faculty of Science, University of Tanta, Tanta 31527, Egypt
| | - Ladislav Šoltés
- Centre of Experimental Medicine of Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia
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Valachová K, Rapta P, Moura NMM, Batinic-Haberle I, Šoltés L. Ortho Isomeric Mn(III) N-Alkyl- and Alkoxyalkylpyridylporphyrins-Enhancers of Hyaluronan Degradation Induced by Ascorbate and Cupric Ions. Int J Mol Sci 2021; 22:ijms22168608. [PMID: 34445313 PMCID: PMC8395334 DOI: 10.3390/ijms22168608] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/06/2021] [Accepted: 08/06/2021] [Indexed: 01/05/2023] Open
Abstract
High levels of hyaluronic acid (HA) in tumors correlate with poor outcomes with several types of cancers due to HA-driven support of adhesion, migration and proliferation of cells. In this study we explored how to enhance the degradation of HA into low-molecular fragments, which cannot prevent the immune system to fight tumor proliferation and metastases. The physiological solution of HA was exposed to oxidative degradation by ascorbate and cupric ions in the presence of either one of three ortho isomeric Mn(III) substituted N-alkyl- and alkoxyalkylpyridylporphyrins or para isomeric Mn(III) N-methylpyridyl analog, commonly known as mimics of superoxide dismutase. The changes in hyaluronan degradation kinetics by four Mn(III) porphyrins were monitored by measuring the alteration in the dynamic viscosity of the HA solution. The ortho compounds MnTE-2-PyP5+ (BMX-010, AEOL10113), MnTnBuOE-2-PyP5+ (BMX-001) and MnTnHex-2-PyP5+ are able to redox cycle with ascorbate whereby producing H2O2 which is subsequently coupled with Cu(I) to produce the •OH radical essential for HA degradation. Conversely, with the para analog, MnTM-4-PyP5+, no catalysis of HA degradation was demonstrated, due to its inertness towards redox cycling with ascorbate. The impact of different Mn(III)-porphyrins on the HA decay was further clarified by electron paramagnetic resonance spectrometry. The ability to catalyze the degradation of HA in a biological milieu, in the presence of cupric ions and ascorbate under the conditions of high tumor oxidative stress provides further insight into the anticancer potential of redox-active ortho isomeric Mn(III) porphyrins.
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Affiliation(s)
- Katarína Valachová
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Dúbravská cesta 9, SK-841 04 Bratislava, Slovakia;
- Correspondence: (K.V.); (P.R.)
| | - Peter Rapta
- Institute of Physical Chemistry and Chemical Physics, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37 Bratislava, Slovakia
- Correspondence: (K.V.); (P.R.)
| | - Nuno M. M. Moura
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal;
| | - Ines Batinic-Haberle
- Department of Radiation Oncology, Duke University School of Medicine, Durham, NC 27710, USA;
| | - Ladislav Šoltés
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Dúbravská cesta 9, SK-841 04 Bratislava, Slovakia;
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Valachová K, Šoltés L. Hyaluronan as a Prominent Biomolecule with Numerous Applications in Medicine. Int J Mol Sci 2021; 22:7077. [PMID: 34209222 PMCID: PMC8269271 DOI: 10.3390/ijms22137077] [Citation(s) in RCA: 12] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 06/25/2021] [Accepted: 06/28/2021] [Indexed: 12/16/2022] Open
Abstract
Hyaluronan (HA) is a natural glycosaminoglycan present in many tissues of all vertebrates. HA has various biological functions, which are dependent on its molar mass. High-molar-mass HA has anti-angiogenic, immunosuppressive and anti-inflammatory properties, while low-molar-mass HA has opposite effects. HA has also antioxidative properties, however on the other hand it can be readily degraded by reactive oxygen species. For many years it has been used in treatment of osteoarthritis, cosmetics and in ophthalmology. In the last years there has been a growing interest of HA to also be applied in other fields of medicine such as skin wound healing, tissue engineering, dentistry and gene delivery. In this review we summarize information on modes of HA administration, properties and effects of HA in various fields of medicine including recent progress in the investigation of HA.
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Affiliation(s)
- Katarína Valachová
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia;
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Hassan MA, Tamer TM, Valachová K, Omer AM, El-Shafeey M, Mohy Eldin MS, Šoltés L. Antioxidant and antibacterial polyelectrolyte wound dressing based on chitosan/hyaluronan/phosphatidylcholine dihydroquercetin. Int J Biol Macromol 2020; 166:18-31. [PMID: 33220372 DOI: 10.1016/j.ijbiomac.2020.11.119] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 11/07/2020] [Accepted: 11/16/2020] [Indexed: 01/09/2023]
Abstract
Antioxidant and antimicrobial wound dressings are the most favorable for acute and chronic wounds treatment. Herein, we formulated a multifunctional polyelectrolyte wound dressing membrane on the basis of chitosan (Ch) and hyaluronan (HA) enhanced by phosphatidylcholine dihydroquercetin (PCDQ). Physicochemical properties and microstructures of fabricated films were investigated adopting Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and scanning electron microscope (SEM). Furthermore, water uptakes, wettability profiles, surface roughness, and mechanical characteristics of the developed membranes were studied. The developed wound dressing revealed free radical scavenging potency, hemocompatibility with a tendency to enhance blood clotting. Furthermore, incorporation of PCDQ significantly promoted the antibacterial and anti-inflammatory activities of Ch/HA/PCDQ. Moreover, Ch/HA/PCDQ films exhibited cellular compatibility towards mouse fibroblast cells. The capability of Ch/HA/PCDQ to promote wound healing was evaluated using adult Wistar albino female rats. The in vivo findings demonstrated that Ch/HA/PCDQ films significantly ameliorated mouse full-thickness wounds as evidenced by a reduction in the wound area. Moreover, histological examinations of wounds dressed with Ch/HA/PCDQ illustrated a prominent re-epithelialization compared with wounds handled with the cotton gauze and Ch/HA dressings, exposing the efficiency of PCDQ. These findings emphasized that a Ch/HA/PCDQ membrane has outstanding potential for wound healing and skin regeneration.
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Affiliation(s)
- Mohamed A Hassan
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt.
| | - Tamer M Tamer
- Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt.
| | - Katarína Valachová
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, 84104 Bratislava, Slovakia
| | - Ahmed M Omer
- Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt
| | - Muhammad El-Shafeey
- Department of Medical Biotechnology, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt
| | - Mohamed S Mohy Eldin
- Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt
| | - Ladislav Šoltés
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, 84104 Bratislava, Slovakia
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Valachová K, Mach M, Šoltés L. Oxidative Degradation of High-Molar-Mass Hyaluronan: Effects of Some Indole Derivatives to Hyaluronan Decay. Int J Mol Sci 2020; 21:ijms21165609. [PMID: 32764392 PMCID: PMC7460571 DOI: 10.3390/ijms21165609] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 06/02/2020] [Revised: 07/23/2020] [Accepted: 07/24/2020] [Indexed: 11/16/2022] Open
Abstract
Indole derivatives such as isatin (a natural compound), cemtirestat, stobadine, and its derivatives (synthetic compounds) are known to have numerous positive effects on human health due to regulation of oxidative status. The aim of the study was to assess radical scavenging capacities of these compounds and explore their potential protective effects against reactive oxygen species formed during Cu(II) ions and ascorbate-induced degradation of high-molar-mass hyaluronan. Based on the IC50 values determined by the ABTS assay, the most effective compound was SM1M3EC2·HCl reaching the value ≈ 11 µmol/L. The lowest IC50 value reached in the DPPH assay was reported for cemtirestat ≈ 3 µmol/L. Great potency of inhibition of hyaluronan degradation was shown by cemtirestat, followed by isatin even at low concentration 10 µmol/L. On the other hand, stobadine·2HCl had also a protective effect on hyaluronan degradation, however at greater concentrations compared to cemtirestat or isatin. SME1i-ProC2·HCl reported to be a less effective compound and SM1M3EC2·HCl can be considered almost ineffective compared to stobadine·2HCl. In conclusion, our results showed that both isatin and cemtirestat were capable of attenuating the degradation of high-molar-mass hyaluronan due to their ability to complex/sequester cupric ions.
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Tamer TM, Hassan MA, Valachová K, Omer AM, El-Shafeey ME, Mohy Eldin MS, Šoltés L. Enhancement of wound healing by chitosan/hyaluronan polyelectrolyte membrane loaded with glutathione: in vitro and in vivo evaluations. J Biotechnol 2020; 310:103-113. [PMID: 32023480 DOI: 10.1016/j.jbiotec.2020.02.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 01/30/2020] [Accepted: 02/01/2020] [Indexed: 12/13/2022]
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Kura B, Bagchi AK, Singal PK, Barancik M, LeBaron TW, Valachova K, Šoltés L, Slezák J. Molecular hydrogen: potential in mitigating oxidative-stress-induced radiation injury. Can J Physiol Pharmacol 2019; 97:287-292. [DOI: 10.1139/cjpp-2018-0604] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Uncontrolled production of oxygen and nitrogen radicals results in oxidative and nitrosative stresses that impair cellular functions and have been regarded as causative common denominators of many pathological processes. In this review, we report on the beneficial effects of molecular hydrogen in scavenging radicals in an artificial system of•OH formation. As a proof of principle, we also demonstrate that in rat hearts in vivo, administration of molecular hydrogen led to a significant increase in superoxide dismutase as well as pAKT, a cell survival signaling molecule. Irradiation of the rats caused a significant increase in lipid peroxidation, which was mitigated by pre-treatment of the animals with molecular hydrogen. The nuclear factor erythroid 2-related factor 2 is regarded as an important regulator of oxyradical homeostasis, as well as it supports the functional integrity of cells, particularly under conditions of oxidative stress. We suggest that the beneficial effects of molecular hydrogen may be through the activation of nuclear factor erythroid 2-related factor 2 pathway that promotes innate antioxidants and reduction of apoptosis, as well as inflammation.
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Affiliation(s)
- Branislav Kura
- Centre of Experimental Medicine, Institute for Heart Research, Slovak Academy of Sciences, 841 04 Bratislava, Slovak Republic
| | - Ashim K. Bagchi
- Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre, University of Manitoba, Winnipeg, MB R2H 2A6, Canada
| | - Pawan K. Singal
- Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre, University of Manitoba, Winnipeg, MB R2H 2A6, Canada
| | - Miroslav Barancik
- Centre of Experimental Medicine, Institute for Heart Research, Slovak Academy of Sciences, 841 04 Bratislava, Slovak Republic
| | - Tyler W. LeBaron
- Centre of Experimental Medicine, Institute for Heart Research, Slovak Academy of Sciences, 841 04 Bratislava, Slovak Republic
- Molecular Hydrogen Institute, Enoch, Utah 84721, USA
| | - Katarina Valachova
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, 841 04 Bratislava, Slovak Republic
| | - Ladislav Šoltés
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, 841 04 Bratislava, Slovak Republic
| | - Ján Slezák
- Centre of Experimental Medicine, Institute for Heart Research, Slovak Academy of Sciences, 841 04 Bratislava, Slovak Republic
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Valachová K, Juránek I, Rapta P, Valent I, Šoltés L. On infusion of high-dose ascorbate in treating cancer: Is it time for N-acetylcysteine pretreatment to enhance susceptibility and to lower side effects? Med Hypotheses 2018; 122:8-9. [PMID: 30593429 DOI: 10.1016/j.mehy.2018.10.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 09/21/2018] [Accepted: 10/10/2018] [Indexed: 10/28/2022]
Abstract
Ascorbate administered intravenously gives a high plasma concentration of this drug. Clinical trials with pancreatic carcinoma patients revealed their prolonged survival if treated with intravenous ascorbate. On the other hand, high plasma ascorbate concentration leads to severe side effects, such as nephrotoxicity. In the present paper, we advocate to lower intravenous ascorbate dosage along with monothiol N-acetylcysteine pretreatment due to anticipation of the same therapeutic effect but less or none of side effects. We describe in detail molecular mechanism of ascorbate action to be potentiated by N-acetylcysteine, as observed under in vitro conditions. Providing further arguments, we believe that the same mechanism may be employed in vivo.
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Affiliation(s)
- K Valachová
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, SK-84104 Bratislava, Slovakia.
| | - I Juránek
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, SK-84104 Bratislava, Slovakia
| | - P Rapta
- Institute of Physical Chemistry and Chemical Physics, SK-81237 Bratislava, Slovakia
| | - I Valent
- Comenius University, Department of Physical and Theoretical Chemistry, SK-84215 Bratislava, Slovakia
| | - L Šoltés
- Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, SK-84104 Bratislava, Slovakia
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Valachová K, Mach M, Dubovický M, Šoltés L. The importance of ergothioneine synthesis in ancient time by organisms living in oxygen free atmosphere. Med Hypotheses 2018; 123:72-73. [PMID: 30696597 DOI: 10.1016/j.mehy.2018.12.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 12/05/2018] [Accepted: 12/22/2018] [Indexed: 10/27/2022]
Abstract
The paper published by Ruczyszky and Liu (2017) reports on the biosynthesis of ergothioneine under both aerobic and anaerobic conditions. We would like to suggest a hypothesis as to what could be the reason that microorganisms on the Earth synthesized ergothioneine under anaerobic conditions.
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Affiliation(s)
- Katarína Valachová
- Institute of Experimental Pharmacology and Toxicology, Centre of Experimental Medicine of the Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia.
| | - Mojmír Mach
- Institute of Experimental Pharmacology and Toxicology, Centre of Experimental Medicine of the Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia
| | - Michal Dubovický
- Institute of Experimental Pharmacology and Toxicology, Centre of Experimental Medicine of the Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia
| | - Ladislav Šoltés
- Institute of Experimental Pharmacology and Toxicology, Centre of Experimental Medicine of the Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia
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Tamer TM, Valachová K, Hassan MA, Omer AM, El-Shafeey M, Mohy Eldin MS, Šoltés L. Chitosan/hyaluronan/edaravone membranes for anti-inflammatory wound dressing: In vitro and in vivo evaluation studies. Mater Sci Eng C Mater Biol Appl 2018; 90:227-235. [PMID: 29853086 DOI: 10.1016/j.msec.2018.04.053] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Revised: 04/03/2018] [Accepted: 04/17/2018] [Indexed: 10/17/2022]
Abstract
A novel wound healing material composed of chitosan (Ch) and hyaluronan (HA) boosted with edaravone (Ed) as an anti-inflammatory drug was developed. The fabricated membranes were verified using FT-IR, and the thermal properties were estimated employing TGA instrument. Moreover, Physical characterizations of the prepared membranes demonstrated a decrease in the membrane wettability, whereas an increase in membrane roughness was monitored due to the effect of edaravone supplementation. A comparative study of free-radical scavenging activity of edaravone itself was carried out by two in vitro approaches: uninhibited/inhibited hyaluronan degradation and decolorization of ABTS methods in normal and simulated inflammation condition (acidic condition). Accordingly, the scavenging activity of edaravone was significantly diminished to OH and peroxy-/alkoxy-type radicals in acidic conditions in compared to the neutral reactions. The biochemical studies evidenced the haemocompatibility of the examined membranes. The consequence of membranes composed of Ch/HA/Ed on the wound healing of the rat's skin was studied, and the macroscopic and microscopic investigations revealed remarkable healing at 21st day post-surgery compared with injuries treated with cotton gauze as a negative control in addition to Ch/HA membrane without edaravone. For these reasons, the Ch/HA/Ed membrane could be implemented as wound dressing material.
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Affiliation(s)
- Tamer M Tamer
- Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt; Laboratory of Bioorganic Chemistry of Drugs, Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, 84104 Bratislava, Slovakia.
| | - Katarína Valachová
- Laboratory of Bioorganic Chemistry of Drugs, Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, 84104 Bratislava, Slovakia
| | - Mohamed A Hassan
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt.
| | - Ahmed M Omer
- Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt
| | - Muhammad El-Shafeey
- Department of Medical Biotechnology, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt
| | - Mohamed S Mohy Eldin
- Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box: 21934, Alexandria, Egypt
| | - Ladislav Šoltés
- Laboratory of Bioorganic Chemistry of Drugs, Centre of Experimental Medicine, Institute of Experimental Pharmacology and Toxicology, 84104 Bratislava, Slovakia
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Tamer TM, Collins MN, Valachová K, Hassan MA, Omer AM, Mohy-Eldin MS, Švík K, Jurčík R, Ondruška Ľ, Biró C, Albadarin AB, Šoltés L. MitoQ Loaded Chitosan-Hyaluronan Composite Membranes for Wound Healing. Materials (Basel) 2018; 11:ma11040569. [PMID: 29642447 PMCID: PMC5951453 DOI: 10.3390/ma11040569] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 04/03/2018] [Accepted: 04/04/2018] [Indexed: 12/25/2022]
Abstract
Two self-associating biopolymers, namely chitosan (Ch) and a high-molar-mass hyaluronan (HA), were used to prepare membranes with the aim to protect and to enhance the healing of injured skin. A mitochondrially-targeted antioxidant—MitoQ—was incorporated into the mixture of biopolymers prior to their self-association. These three-component membranes were evaluated in detail utilising surface roughness measurements, contact angle measurements, hemocompatibility, and thrombogenicity analyses. Furthermore, in vivo application of Ch/HA/MitoQ membranes was assessed on injured rabbit and rat skin utilizing histological methods. The results showed that the prepared thrombogenic Ch/HA/MitoQ membranes had higher roughness, which allowed for greater surface area for tissue membrane interaction during the healing processes, and lower cytotoxicity levels than controls. MitoQ-loaded composite membranes displayed superior healing properties in these animal models compared to control membranes.
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Affiliation(s)
- Tamer M Tamer
- Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934 Alexandria, Egypt.
- Laboratory of Bioorganic Chemistry of Drugs, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, 84104 Bratislava, Slovakia.
| | - Maurice N Collins
- School of Engineering, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland.
| | - Katarina Valachová
- Laboratory of Bioorganic Chemistry of Drugs, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, 84104 Bratislava, Slovakia.
| | - Mohamed A Hassan
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934 Alexandria, Egypt.
| | - Ahmed M Omer
- Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934 Alexandria, Egypt.
| | - Mohamed S Mohy-Eldin
- Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934 Alexandria, Egypt.
- Chemistry Department, Faculty of Science, University of Jeddah, Osfan, P. O. Box: 80203, 21589 Jeddah, Saudi Arabia.
| | - Karol Švík
- Department of Toxicology and Laboratory Animals Breeding, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, 91954 Dobra Voda 360, Slovakia.
| | - Rastislav Jurčík
- National Agricultural and Food Centre, Research Institute for Animal Production Nitra, Department of Small Farm Animals, 951 41 Lužianky, Slovakia.
| | - Ľubomír Ondruška
- National Agricultural and Food Centre, Research Institute for Animal Production Nitra, Department of Small Farm Animals, 951 41 Lužianky, Slovakia.
| | - Csaba Biró
- St. Elizabeth Cancer Institute Hospital, Department of Pathology, Bratislava, 84104, Slovakia.
| | - Ahmad B Albadarin
- Department of Chemical Sciences, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland.
| | - Ladislav Šoltés
- Laboratory of Bioorganic Chemistry of Drugs, Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, 84104 Bratislava, Slovakia.
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Tamer TM, Hassan MA, Omer AM, Valachová K, Eldin MSM, Collins MN, Šoltés L. Antibacterial and antioxidative activity of O-amine functionalized chitosan. Carbohydr Polym 2017; 169:441-450. [PMID: 28504167 DOI: 10.1016/j.carbpol.2017.04.027] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [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: 11/11/2016] [Revised: 04/10/2017] [Accepted: 04/12/2017] [Indexed: 02/05/2023]
Abstract
Cinnamaldehyde was immobilized to O-amine functionalized chitosan via a coupling reaction. Fourier transform infrared spectroscopy confirmed N-cinnamyl substitution. Wetting analyses demonstrate more hydrophobicity in the N-cinnamyl substituted O-amine functionalized chitosan compared to chitosan or unsubstituted O-amine functionalized chitosan. Thermal gravimetric analysis and differential scanning calorimetry demonstrates that the prepared N-cinnamyl substituted O-amine functionalized chitosan exhibits higher thermostability than unmodified chitosan at temperatures in which polysaccharides are commonly stored and utilised. The N-cinnamyl substituted O-amine functionalized chitosan, against four different bacteria strains [two gram-positive (Staphylococcus aureus and Bacillus cereus) and two gram-negative (Escherichia coli and Pseudomonas aeruginosa)], displays promotion of inhibition activity against these bacterial strains. Finally, the antioxidative activity of the N-cinnamyl substituted O-amine functionalized chitosan was compared with those activities of chitosan and O-amine functionalized chitosan. This was evaluated by uninhibited and inhibited hyaluronan degradation and ABTS assay. The N-cinnamyl substituted O-amine functionalized chitosan shows a lower activity towards donating a hydrogen radical compared to chitosan or O-amine functionalized chitosan. On the other hand, the N-cinnamyl substituted O-amine functionalized chitosan exhibited a higher ability to scavenge the ABTS+ cation radical compared to chitosan and O-amine functionalized chitosan.
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Affiliation(s)
- Tamer M Tamer
- Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City Alexandria, Egypt; Laboratory of Bioorganic Chemistry of Drugs, Institute of Experimental Pharmacology and Toxicology, Bratislava, Slovakia
| | - Mohamed A Hassan
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, Egypt
| | - Ahmed M Omer
- Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City Alexandria, Egypt
| | - Katarína Valachová
- Laboratory of Bioorganic Chemistry of Drugs, Institute of Experimental Pharmacology and Toxicology, Bratislava, Slovakia
| | - Mohamed S Mohy Eldin
- Polymer Materials Research Department, Advanced Technologies and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City Alexandria, Egypt; Chemistry Department, Faculty of Science, University of Jeddah, Osfan, Saudi Arabia
| | - Maurice N Collins
- Stokes Laboratories, Bernal Institute, University of Limerick, Ireland.
| | - Ladislav Šoltés
- Laboratory of Bioorganic Chemistry of Drugs, Institute of Experimental Pharmacology and Toxicology, Bratislava, Slovakia
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Valent I, Topolská D, Valachová K, Bujdák J, Šoltés L. Kinetics of ABTS derived radical cation scavenging by bucillamine, cysteine, and glutathione. Catalytic effect of Cu(2+) ions. Biophys Chem 2016; 212:9-16. [PMID: 26978549 DOI: 10.1016/j.bpc.2016.02.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 12/08/2015] [Revised: 02/18/2016] [Accepted: 02/18/2016] [Indexed: 11/18/2022]
Abstract
Kinetics of reduction of the stable radical cation derived from 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS) in reaction with the anti-rheumatic drug bucillamine (BUC) and two reference thiols - cysteine (Cys) and glutathione (GSH) was followed spectrophotometrically in acidic medium with 10-fold molar excess of the reductant. Decay of the radical is governed by pseudo-first order kinetics with small deviation in the case of GSH. H(+) ions displayed second order inhibition of the reaction with all the studied compounds. The reaction of BUC exhibits zero order kinetics to the radical at lower acidities with a moderate acceleration of the reaction rate by H(+) ions. A significant catalytic effect of Cu(2+) ions on the reactions with all the reductants was observed. The most sensitive to Cu(2+)-catalysis was the reaction of BUC with the radical cation, while Cu(2+) ions showed much lower effect on the reaction with GSH. The presence of EDTA strongly inhibited the reactions and equalized the reaction rates for all the reductants. A Cu(I) selective chelator bathocuproine disulfonate reduced the reaction rate with Cys, but accelerated the reaction with BUC at the lower acidities. The experimental results were rationalized in the framework of the mechanism of reductive chelation. The conclusions may have important consequences for interpretation of antioxidant capacity assays, such as TEAC, utilizing the ABTS derived radical cation.
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Affiliation(s)
- Ivan Valent
- Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic.
| | - Dominika Topolská
- Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovak Republic
| | - Katarína Valachová
- Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovak Republic
| | - Juraj Bujdák
- Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
| | - Ladislav Šoltés
- Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04 Bratislava, Slovak Republic
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Valachová K, Tamer TM, Eldin MM, Šoltés L. Radical-scavenging activity of glutathione, chitin derivatives and their combination‡. Chemical Papers 2016. [DOI: 10.1515/chempap-2016-0011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
AbstractSince chitosan and its amino-, cinnamo- or cinnamo-amino- derivatives are acid-soluble, the effect of acetic acid on hyaluronan (HA) macromolecules degraded by Cu(II) ions and ascorbate was examined to produce reactive oxygen species (ROS). Further, the effects of glutathione (GSH), chitosan and its derivatives, added individually or in combination, on the quenching of ROS and ABTS
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Valachová K, Baňasová M, Topoľská D, Sasinková V, Juránek I, Collins MN, Šoltés L. Influence of tiopronin, captopril and levamisole therapeutics on the oxidative degradation of hyaluronan. Carbohydr Polym 2015; 134:516-23. [DOI: 10.1016/j.carbpol.2015.07.029] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 06/19/2015] [Accepted: 07/08/2015] [Indexed: 11/29/2022]
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Abstract
One of the very complex structures in the vertebrates is the joint. The main component of the joint is the synovial fluid with its high-molar-mass glycosaminoglycan hyaluronan, which turnover is approximately twelve hours. Since the synovial fluid does not contain any hyaluronidases, the fast hyaluronan catabolism is caused primarily by reductive-oxidative processes.Eight transition metals - V(23), Mn(25), Fe(26), Co(27), Ni(28), Cu(29), Zn(30), and Mo(42) - naturally occurring in living organism are essential for the control of various metabolic and signaling pathways. They are also the key elements in catabolism of hyaluronan in the joint.In this overview, the role of these metals in physiological and pathophysiological catabolism of hyaluronan is described. The participation of these metals in the initiation and propagation of the radical degradation hyaluronan is critically reviewed.
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Affiliation(s)
- Ladislav Šoltés
- Institute of Experimental Pharmacology, Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia
| | - Grigorij Kogan
- Directorate Health, Directorate General Research, European Commission, B-1049, Brussels, Belgium
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Hrabárová E, Valachová K, Rychlý J, Rapta P, Sasinková V, Malíková M, Šoltés L. High-molar-mass hyaluronan degradation by Weissberger's system: Pro- and anti-oxidative effects of some thiol compounds. Polym Degrad Stab 2009. [DOI: 10.1016/j.polymdegradstab.2009.05.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Rychlý J, Šoltés L, Stankovská M, Janigová I, Csomorová K, Sasinková V, Kogan G, Gemeiner P. Unexplored capabilities of chemiluminescence and thermoanalytical methods in characterization of intact and degraded hyaluronans. Polym Degrad Stab 2006. [DOI: 10.1016/j.polymdegradstab.2006.07.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [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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Orviský E, Šoltés L, Chabrček P, Novák I, Kéry V, Stančíková M, Vinš I. The Determination of Hyaluronan Molecular Weight Distribution by Means of High-Performance Size Exclusion Chromatography. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10826079208020879] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- E. Orviský
- a Research Institute of Rheumatic Diseases , 921 01, Pieštàny, CSFR
| | - L. Šoltés
- b Institute of Experimental Pharmacology, Slovak Academy of Sciences , 842 16, Bratislava, CSFR
| | - P. Chabrček
- c Faculty of Chemical Technology , Slovak Technical University , 812 37, Bratislava, CSFR
| | - I. Novák
- d Institute of Polymers, Slovak Academy of Sciences , 842 36, Bratislava, CSFR
| | - V. Kéry
- a Research Institute of Rheumatic Diseases , 921 01, Pieštàny, CSFR
| | - M. Stančíková
- a Research Institute of Rheumatic Diseases , 921 01, Pieštàny, CSFR
| | - I. Vinš
- e TESSEK Ltd. , 110 01, Prague, CSFR-Denmark
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Chabreček P, Šoltés L, Kállay Z, Fügedi A. Isolation and characterisation of high molecular weight [3H]hyaluronic acid. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.2580281003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Kyselová Z, Križanová Ľ, Šoltés L, Štefek M. Erratum to “Electrophoretic analysis of oxidatively modified eye lens proteins in vitro: implications for diabetic cataract” [J. Chromatogr. A 1084 (2005) 95–100]. J Chromatogr A 2005. [DOI: 10.1016/j.chroma.2005.10.078] [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: 11/25/2022]
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Masárová J, Mislovičová D, Šoltés L. Investigation of the Conjugation Reaction of Mannan with Albumin. International Journal of Polymer Analysis and Characterization 2002. [DOI: 10.1080/10236660214600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Machová E, Kogan G, Šoltés L, Kvapilová K, Šandula J. Ultrasonic depolymerization of the chitin–glucan isolated from Aspergillus niger. REACT FUNCT POLYM 1999. [DOI: 10.1016/s1381-5148(98)00085-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Šoltés L, Séabille B. Study of Macrobiomolecule-Ligand Interactions by Liquid-Chromatographic Separation Methods Under Equilibrium and Nonequilibrium Conditions. ACTA ACUST UNITED AC 1994. [DOI: 10.1080/10826079408013542] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chabreček P, Šoltés L, Hradec H, Filip J, Orviský E. Preparation and Characterization of the High Molecular Weight [3H]Hyaluronic Acid. ACTA ACUST UNITED AC 1992. [DOI: 10.1135/cccc19922151] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Two methods for the preparation of high molecular weight [3H]hyaluronic acid were investigated. In the first one, hydrogen atoms in the molecule were replaced by tritium. This isotopic substitution was performed in aqueous solution using Pd/CaCO3 as the catalyst. In the second method, the high molecular weight hyaluronic acid was alkylated with [3H]methyl bromide in liquid ammonia at a temperature of -33.5 °C. High-performance gel permeation chromatographic separation method was used for the isolation and characterization of the high molecular weight [3H]hyaluronic acid. Molecular weight parameters for the labelled biopolymers were Mw = 128 kDa, Mw/Mn = 1.88 (first method) and Mw = 268 kDa, Mw/Mn = 1.55 (second method). The high molecular weight [3H]hyaluronic acid having Mw = 268 kDa was degraded further by specific hyaluronidase. Products of the enzymatic depolymerization were observed to be identical for both, labelled and cold biopolymer. This finding indicates that the described labelling procedure using [3H]methyl bromide does not induce any major structural rearrangements in the molecule.
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Abstract
AbstractSharp lower and upper bounds for the Wiener index (W) of a connected (n, m)-graph are reported; n = number of vertices, m = number of edges. The mean isomer degeneracy of W is estimated and is shown to unboundedly increase with increasing n. Thus the isomer-discriminating power of W is confirmed to be very low in the case of large molecules.
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Affiliation(s)
- I. Gutman
- 1Faculty of Science, University of Kragujevac, Yugoslavia
| | - L. Šoltés
- 2Faculty of Mathematics and Physics, Comenius University, Bratislava, Czecho-Slovakia
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Horváthová M, Mislovičová D, Šoltés L, Tuzar Z, Gemeiner P, Žúbor V. Preparation and molecular characterization of carboxymethylglucan fractions. Carbohydr Polym 1991. [DOI: 10.1016/0144-8617(91)90021-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Horváthová M, Šoltés L, Lutonská H, Šandula J, Mislovičová D. Study of water-soluble β-1,3-glucan denaturation with dimethyl sulfoxide using gel permeation chromatography. J Appl Polym Sci 1991. [DOI: 10.1002/app.1991.070480004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Chabreček P, Šoltés L, Kállay Z, Novák I. Gel permeation chromatographic characterization of sodium hyaluronate and its fractions prepared by ultrasonic degradation. Chromatographia 1990. [DOI: 10.1007/bf02274547] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [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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34
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Macko T, Šoltés L, Berek D. Pressure jumps due to flow interruptions as source of system peaks in liquid chromatography with mixed eluents. Chromatographia 1989. [DOI: 10.1007/bf02319645] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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35
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Gemeiner P, Barteltová L, Šoltés L, Breier A. Size-exclusion effect of a substrate upon kinetics of trypsin immobilized on porous bead cellulose. 2. Influence of hydrodynamic diameter of substrate. Enzyme Microb Technol 1987. [DOI: 10.1016/0141-0229(87)90047-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Mislovičová D, Gemeiner P, Šoltés L. Inhibition of lactate dehydrogenase ex rabbit muscle by Cibacron Blue 3G-A bound to water-soluble hydroxyethylcellulose. ACTA ACUST UNITED AC 1985. [DOI: 10.1135/cccc19851335] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The interaction between lactate dehydrogenase and hydroxyethylcellulose - Cibacron Blue 3G-A conjugates was investigated kinetically. These conjugates were obtained by covalent binding of Cibacron Blue to water-soluble hydroxyethylcelluloses, of average relative molecular masses 2.5 . 104 to 11.6 . 104. The polymeric matrix (non-branched β-glucan) was, unlike the branched α-glucans, found to inhibit the action of the dye, irrespective of the molecular mass of this matrix. With increasing amount of the bound dye the interaction between the dye and the enzyme was enhanced.
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Šoltés L, Berek D, Mikulášová D. Characterization of the extremely high molecular mass polystyrene by gel permeation chromatography. Colloid Polym Sci 1980. [DOI: 10.1007/bf01384361] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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