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Tverdokhlebova A, Sterin I, Darie CC, Katz E, Smutok O. Stimulation-Inhibition of Protein Release from Alginate Hydrogels Using Electrochemically Generated Local pH Changes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:57408-57418. [PMID: 36516447 DOI: 10.1021/acsami.2c17914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The electrochemically controlled release of proteins was studied in a Ca2+-cross-linked alginate hydrogel deposited on an electrode surface. The electrochemical oxidation of ascorbate or reduction of O2 was achieved upon applying electrical potentials +0.6 or -0.8 V (vs Ag/AgCl/KCl 3 M), respectively, resulting in decreasing or increasing pH locally near an electrode surface. The obtained local acidic solution resulted in the protonation of carboxylic groups in the alginate hydrogel and, as a result, the formation of a hydrophobic shrunken hydrogel film. Conversely, the produced alkaline local environment resulted in a hydrophilic swollen hydrogel film. The release of the proteins was effectively inhibited from the shrunk hydrogel and activated from the swollen hydrogel film. Overall, the electrochemically produced local pH changes allowed control over the biomolecule release process. While the release inhibition by applying +0.6 V was always effective and could be maintained as long as the positive potential was applied, the release activation was different depending on the protein molecular size, being more effective for smaller species, and molecule charge, being more effective for negatively charged species. The repetitive change from the inhibited to stimulated state of the biomolecule release process was obtained upon cyclic application of oxidative and reductive potentials (+0.6 V ↔ -0.8 V). The alginate hydrogel film shrinking-swelling as well as the protein release process were studied and visualized using a confocal fluorescent microscope. In order to be observed, an external surface of the alginate film and the loaded protein molecules were labeled with different fluorescent dyes, which then produced colored fluorescent images under a confocal microscope.
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Affiliation(s)
- Anna Tverdokhlebova
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
| | - Ilya Sterin
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
| | - Costel C Darie
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
- Biochemistry & Proteomics Laboratories, Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
| | - Evgeny Katz
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
| | - Oleh Smutok
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
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Tuned Gum ghatti and pectin for green synthesis of novel wound dressing material: Engineering aspects and in vivo study. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Nishiyama M, Funaba M, Matsui T. Magnesium bioavailability of dried and thinly shaved kombu in rats. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2021; 101:272-278. [PMID: 32623713 DOI: 10.1002/jsfa.10639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 06/26/2020] [Accepted: 07/05/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Magnesium (Mg) is highly bioavailable in kombu compared with other edible seaweeds. However, a considerable amount of Mg is lost during industrial processing and cooking of kombu. We hypothesized that thinly shaved kombu (TSK), a traditional Japanese kombu product, is a suitable Mg source for daily diets because TSK hardly loses Mg during processing. Rats were fed diets containing TSK or magnesium oxide (MgO) to satisfy 25%, 50%, 75%, or 100% of their Mg requirements. We determined the relative Mg bioavailability of TSK compared to MgO and examined factors affecting Mg bioavailability in TSK. RESULTS The relative bioavailability of Mg in TSK compared with MgO was calculated as 92.3%, 111.4%, and 87.2% from apparent absorption, urinary excretion, and femoral concentration of Mg, respectively. The ultrafiltrable Mg concentration was lower in the cecal content of rats given TSK than those given MgO. However, the mRNA expression of TRPM6, an Mg channel responsible for Mg absorption, was higher in the cecum of rats given TSK than those given MgO. CONCLUSION Enhancement of TRPM6 expression in the large intestine negates the low bioaccessibility of Mg in TSK, and thus TSK shows Mg bioavailability comparable with MgO. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Manami Nishiyama
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Masayuki Funaba
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Tohru Matsui
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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Qiao Z, Mieles M, Ji H. Injectable and moldable hydrogels for use in sensitive and wide range strain sensing applications. Biopolymers 2020; 111:e23355. [DOI: 10.1002/bip.23355] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 03/20/2020] [Accepted: 04/06/2020] [Indexed: 12/20/2022]
Affiliation(s)
- Zhen Qiao
- Department of ChemistryDrexel University Philadelphia Pennsylvania USA
| | - Matthew Mieles
- Department of ChemistryDrexel University Philadelphia Pennsylvania USA
| | - Hai‐Feng Ji
- Department of ChemistryDrexel University Philadelphia Pennsylvania USA
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Gargava A, Ahn S, Bentley WE, Raghavan SR. Rapid Electroformation of Biopolymer Gels in Prescribed Shapes and Patterns: A Simpler Alternative to 3-D Printing. ACS APPLIED MATERIALS & INTERFACES 2019; 11:37103-37111. [PMID: 31566952 DOI: 10.1021/acsami.9b12575] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We demonstrate the use of electric fields to rapidly form gels of the biopolymer alginate (Alg) in specific three-dimensional (3-D) shapes and patterns. In our approach, we start with a gel of the biopolymer agarose, which is thermoresponsive and hence can be molded into a specific shape. The agarose mold is then loaded with Ca2+ cations and placed in a beaker containing an Alg solution. The inner surface of the beaker is surrounded by aluminum foil (cathode), and a copper wire (anode) is stuck in the agarose mold. These are connected to a direct current (DC) power source, and when a potential of ∼10 V is applied, an Alg gel is formed in a shape that replicates the mold. Gelation occurs because the Ca2+ ions electrophoretically migrate away from the mold, whereupon they cross-link the Alg chains adjacent to the mold. At low Ca2+ (0.01 wt %), the Alg gel layer grows outward from the mold surface at a steady rate of about 0.8 mm/min, and the gel stops growing when the field is switched off. After a gel of desired thickness is formed, the agarose mold can be melted away to leave behind an Alg gel in a precise shape. Alg gels formed in this manner are transparent and robust. This process is particularly convenient to form Alg gels in the form of hollow tubes, including tubes with multiple concentric layers, each with a different payload. The technique is safe for encapsulation of biological species within a given Alg layer. We also create Alg gels in specific patterns by directing gel growth around selected regions. Overall, our technique enables lab-scale manufacturing of alginate gels in 3-D without the need for an expensive 3-D printer.
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Watanabe S, Tominaga T, Matsumoto M. Alternate Soaking Technique for Micropatterning Alginate Hydrogels on Wettability-patterned Substrates. J Oleo Sci 2019; 68:53-60. [PMID: 30542009 DOI: 10.5650/jos.ess18166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Techniques for patterning hydrogels are important for fabrication of cell culture, analytical, and actuator devices at the micro- and nanometer length scales. In this study, we fabricated alginate hydrogels cross-linked by divalent cations on wettability-patterned substrates by alternate soaking of precursor solutions of sodium alginate and divalent cations. The wettability-patterned substrates were fabricated on hydrophilic glass plates modified with hydrophobic self-assembled monolayers of hexamethyldisilazane followed by exposure to an ultraviolet/ozone atmosphere through a metal mask. The film thickness of alginate gels with a width and length of 0.1 and 4 mm were tuned stepwise from 30 nm to 200 nm by adjusting the precursor conditions, including the pH, type of divalent metal ions, and sodium alginate concentration, and the alternate soaking conditions, including the dipping/withdrawal speed and number of alternate soaking cycles. This technique can be applied to other functional gels and will contribute to fabrication of hydrogel devices at the micro- and nanometer scales in the future.
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Affiliation(s)
| | - Taiga Tominaga
- Department of Materials Science and Technology, Tokyo University of Science
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Athas JC, Nguyen CP, Kummar S, Raghavan SR. Cation-induced folding of alginate-bearing bilayer gels: an unusual example of spontaneous folding along the long axis. SOFT MATTER 2018; 14:2735-2743. [PMID: 29565078 DOI: 10.1039/c8sm00321a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The spontaneous folding of flat gel films into tubes is an interesting example of self-assembly. Typically, a rectangular film folds along its short axis when forming a tube; folding along the long axis has been seen only in rare instances when the film is constrained. Here, we report a case where the same free-swelling gel film folds along either its long or short axis depending on the concentration of a solute. Our gels are sandwiches (bilayers) of two layers: a passive layer of cross-linked N,N'-dimethylyacrylamide (DMAA) and an active layer of cross-linked DMAA that also contains chains of the biopolymer alginate. Multivalent cations like Ca2+ and Cu2+ induce these bilayer gels to fold into tubes. The folding occurs instantly when a flat film of the gel is introduced into a solution of these cations. The likely cause for folding is that the active layer stiffens and shrinks (because the alginate chains in it get cross-linked by the cations) whereas the passive layer is unaffected. The resulting mismatch in swelling degree between the two layers creates internal stresses that drive folding. Cations that are incapable of cross-linking alginate, such as Na+ and Mg2+, do not induce gel folding. Moreover, the striking aspect is the direction of folding. When the Ca2+ concentration is high (100 mM or higher), the gels fold along their long axis, whereas when the Ca2+ concentration is low (40 to 80 mM), the gels fold along their short axis. We hypothesize that the folding axis is dictated by the inhomogeneous nature of alginate-cation cross-linking, i.e., that the edges get cross-linked before the faces of the gel. At high Ca2+ concentration, the stiffer edges constrain the folding; in turn, the gel folds such that the longer edges are deformed less, which explains the folding along the long axis. At low Ca2+ concentration, the edges and the faces of the gel are more similar in their degree of cross-linking; therefore, the gel folds along its short axis. An analogy can be made to natural structures (such as leaves and seed pods) where stiff elements provide the directionality for folding.
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Affiliation(s)
- Jasmin C Athas
- Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
| | - Catherine P Nguyen
- Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA
| | - Shailaa Kummar
- Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA and Department of Bioengineering, University of Toledo, Toledo, Ohio, USA
| | - Srinivasa R Raghavan
- Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742, USA. and Department of Chemical & Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA
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Yadav P, Singh SP, Rengan AK, Shanavas A, Srivastava R. Gold laced bio-macromolecules for theranostic application. Int J Biol Macromol 2018; 110:39-53. [DOI: 10.1016/j.ijbiomac.2017.10.124] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 09/26/2017] [Accepted: 10/18/2017] [Indexed: 02/07/2023]
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9
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Development of smart hydrogels of etherified gum ghatti for sustained oral delivery of ropinirole hydrochloride. Int J Biol Macromol 2017; 103:347-354. [DOI: 10.1016/j.ijbiomac.2017.04.059] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 03/29/2017] [Accepted: 04/14/2017] [Indexed: 11/16/2022]
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10
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Castel-Molieres M, Conzatti G, Torrisani J, Rouilly A, Cavalie S, Carrere N, Tourrette A. Influence of Homogenization Technique and Blend Ratio on Chitosan/Alginate Polyelectrolyte Complex Properties. J Med Biol Eng 2017. [DOI: 10.1007/s40846-017-0304-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Narayanan KB, Han SS. Colorimetric detection of manganese(II) ions using alginate-stabilized silver nanoparticles. RESEARCH ON CHEMICAL INTERMEDIATES 2017. [DOI: 10.1007/s11164-017-2954-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Vicini S, Mauri M, Wichert J, Castellano M. Alginate gelling process: Use of bivalent ions rich microspheres. POLYM ENG SCI 2017. [DOI: 10.1002/pen.24552] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Silvia Vicini
- Department of Chemistry and Industrial Chemistry; University of Genova; Genova 16146 Italy
| | - Marco Mauri
- Department of Chemistry and Industrial Chemistry; University of Genova; Genova 16146 Italy
| | | | - Maila Castellano
- Department of Chemistry and Industrial Chemistry; University of Genova; Genova 16146 Italy
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Burg A, Oshrat LO. Salt Effect on the Antioxidant Activity of Red Microalgal Sulfated Polysaccharides in Soy-Bean Formula. Mar Drugs 2015; 13:6425-39. [PMID: 26492255 PMCID: PMC4626698 DOI: 10.3390/md13106425] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/03/2015] [Accepted: 10/08/2015] [Indexed: 01/25/2023] Open
Abstract
Sulfated polysaccharides produced by microalgae, which are known to exhibit various biological activities, may potentially serve as natural antioxidant sources. To date, only a few studies have examined the antioxidant bioactivity of red microalgal polysaccharides. In this research, the effect of different salts on the antioxidant activities of two red microalgal sulfated polysaccharides derived from Porphyridium sp. and Porphyridium aerugineum were studied in a soy bean-based infant milk formula. Salt composition and concentration were both shown to affect the polysaccharides' antioxidant activity. It can be postulated that the salt ions intefer with the polysaccharide chains' interactions and alter their structure, leading to a new three-dimensional structure that better exposes antiooxidant sites in comparison to the polysaccharide without salt supplement. Among the cations that were studied, Ca(2+) had the strongest enhancement effect on antioxidant activities of both polysaccharides. Understanding the effect of salts on polysaccharides' stucture, in addition to furthering knowledge on polysaccharide bioactivities, may also shed light on the position of the antioxidant active sites.
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Affiliation(s)
- Ariela Burg
- Department of Chemical Engineering, Sami Shamoon College of Engineering, Basel/Bialik sts., Beer-Sheva 8410001, Israel.
| | - Levy-Ontman Oshrat
- Department of Chemical Engineering, Sami Shamoon College of Engineering, Basel/Bialik sts., Beer-Sheva 8410001, Israel.
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Sergeeva AS, Gorin DA, Volodkin DV. In-situ assembly of Ca-alginate gels with controlled pore loading/release capability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10813-10821. [PMID: 26345198 DOI: 10.1021/acs.langmuir.5b01529] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Development of tailor-made porous polymer scaffolds acting as a temporary tissue-construct for cellular organization is of primary importance for tissue engineering applications. Control over the gel porosity is a critical issue due to the need for cells to proliferate and migrate and to ensure the transport of nutrition and metabolites. Gel loading with bioactive molecules is desired for target release of soluble signals to guide cell function. Calcium-alginate hydrogels are one of the most popular gels successfully utilized as polymer scaffolds. Here we propose a benchtop approach to design porous alginate gels by dispersion of CaCO3 vaterite crystals in sodium alginate followed by the crystal elimination. CaCO3 crystals play a triple role being (i) cross-linkers (a source of calcium ions to cross-link gel network), (ii) pore-makers (leaching of crystals retains the empty pores), and (iii) reservoirs with (bio)molecules (by molecule preloading into the crystals). Pore dimensions, interconnectivity, and density can be adjusted by choosing the size, concentration, and packing of the sacrificial CaCO3 crystals. An opportunity to load the pores with biomolecules was demonstrated using FITC-labeled dextrans of different molecular masses from 10 to 500 kDa. The dextrans were preloaded into CaCO3 vaterite crystals, and the subsequent crystal removal resulted in encapsulation of dextrans inside the pores of the gel. The dextran release rate from the gel pores depends on the equilibration of the gel structure as concluded by comparing dextran release kinetics during gelation (fast) and dextran diffusion into the performed gel (slower). Macromolecule binding to the gel is electrostatically driven as found for lysozyme and insulin. The application of porous gels as scaffolds potentially offering biomacromolecule encapsulation/release performance might be useful for alginate gel-based applications such as tissue engineering.
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Affiliation(s)
- Alena S Sergeeva
- Fraunhofer Institute for Cell Therapy and Immunology (Fraunhofer IZI), Am Muehlenberg 13, Potsdam, 14476, Germany
- Saratov State University , Astrakhanskaya 81, Saratov, 410012, Russia
| | - Dmitry A Gorin
- Saratov State University , Astrakhanskaya 81, Saratov, 410012, Russia
| | - Dmitry V Volodkin
- Fraunhofer Institute for Cell Therapy and Immunology (Fraunhofer IZI), Am Muehlenberg 13, Potsdam, 14476, Germany
- Lomonosov Moscow State University, Department of Chemistry, Leninskiye gory 1-3, Moscow, 119991, Russia
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Yasadi K, Pinheiro JP, Zielińska K, Town RM, van Leeuwen HP. Partitioning of humic acids between aqueous solution and hydrogel. 3. Microelectrodic dynamic speciation analysis of free and bound humic metal complexes in the gel phase. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1737-1745. [PMID: 25580682 DOI: 10.1021/la504885v] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The hydrogel/water partitioning of the various species in the cadmium(II)/soil humic acid (HA) system is studied for two types of gel, using in situ microelectrodic voltammetry. Under the conditions of this work, with HA particles of ca. 25 and 125 nm radius, the CdHA complex is shown to be close to nonlabile toward a 12.5 μm radius microelectrode. This implies that its kinetic contribution to Cd(2+) reduction at the medium/microelectrode interface is practically negligible. The polyacrylamide (PAAm) gels equilibrate with the aqueous medium under significant sorption of HA at the gel backbone/gel medium interface, which in turn leads to induced sorption of Cd(II) in the form of immobilized gel-bound CdHA. The rather high total Cd content of the PAAm gel suggests that the binding of Cd(2+) by the hydrophobically gel-bound HA is stronger than that for dispersed HA particles. Still, the intraparticulate speciation of Cd(II) over Cd(2+) and CdHA corresponds to an intrinsic stability constant similar to that for simple monocarboxylate ligands such as acetate. Alginate gels are negatively charged, and their free [Cd(aq)(2+)] is higher than that in the medium by the corresponding Donnan coefficient. On top of that, Cd(2+) is specifically sorbed by the gel backbone/gel medium interface to reach accumulation factors as high as a few tens. HA and CdHA accumulate in the outer 20 μm film of gel at the gel/water interface of both gels, but they do not penetrate into the bulk of the alginate gel. Overall, the gel/water interface dictates drastic changes in the speciation of Cd/HA as compared to the aqueous medium, with distinct features for each individual type of gel. The results have broad significance, for example, for predictions of reactivity and bioavailability of metal species which inherently involve partitioning and diffusion into diverse gel layers such as biointerfacial cell walls, biofilm matrices, and mucous membranes.
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Affiliation(s)
- Kamuran Yasadi
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University , Dreijenplein 6, 6703 HB Wageningen, The Netherlands
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WANG D, ZHANG F, TANG J. Sodium Alginate Decorated Carbon Nanotubes-Graphene Composite Aerogel for Heavy Metal Ions Detection. ELECTROCHEMISTRY 2015. [DOI: 10.5796/electrochemistry.83.84] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Dafu WANG
- State Laboratory of Fiber Materials and Modern Textile, Qingdao University
- Department of Materials Science, College of Chemical Science and Engineering, Qingdao University
| | - Feifei ZHANG
- Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Qingdao University
- State Laboratory of Fiber Materials and Modern Textile, Qingdao University
| | - Jie TANG
- Doctoral Program in Materials Science and Engineering, University of Tsukuba
- National Institute for Materials Science
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Comparison of ionic and non-ionic drug release from multi-membrane spherical aerogels. Int J Pharm 2013; 454:58-66. [PMID: 23850813 DOI: 10.1016/j.ijpharm.2013.06.074] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 06/20/2013] [Accepted: 06/27/2013] [Indexed: 10/26/2022]
Abstract
The presented research was oriented towards the preparation of dry biodegradable alginate aerogels with multi-membranes using a multi-step sol-gel process with potential applications as carriers during oral drug delivery. First alginate spherical hydrogels were formed in CaCl2 or BaCl2 solutions by ionic cross-linking. These cores were further immersed into alginate sodium solution, filtered through a sieve, and dropped into the salt solution again. Multi-membrane hydrogels were obtained by repeating the above process. They were further converted into aerogels by supercritical drying. The effect of the number of membranes was investigated regarding the loading and release of the model drugs nicotinic acid and theophylline. Moreover, the efficiencies of Ba(2+) and Ca(2+) metal ions for forming tridimensional networks that retain and extend drug release were also investigated. Nicotinic acid release was prolonged by adding membranes around the core and using Ca(2+) for cross-linking. However, retarded theophylline release was only obtained by using Ba(2+) for cross-linking. Namely, by increasing the number of membranes and BaCl2 concentration drug release became linear versus time in all studied cases. In the case of nicotinic acid loading increased by adding membranes around the core, however, for theophylline the opposite results were obtained due to the different nature of the model drugs.
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Kodiyan A, Silva EA, Kim J, Aizenberg M, Mooney DJ. Surface modification with alginate-derived polymers for stable, protein-repellent, long-circulating gold nanoparticles. ACS NANO 2012; 6:4796-4805. [PMID: 22650310 DOI: 10.1021/nn205073n] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Poly(ethylene) glycol is commonly used to stabilize gold nanoparticles (GNPs). In this study, we evaluated the ability of cysteine-functionalized alginate-derived polymers to both provide colloidal stability to GNPs and avoid recognition and sequestration by the body's defense system. These polymers contain multiple reactive chemical groups (hydroxyl and carboxyl groups) that could allow for ready functionalization with, for example, cell-targeting ligands and therapeutic drugs. We report here that alginate-coupled GNPs demonstrate enhanced stability in comparison with bare citrate-coated GNPs and a similar lack of interaction with proteins in vitro and long in vivo circulation as PEG-coated GNPs.
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Affiliation(s)
- Anu Kodiyan
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts 02138, USA
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Perić-Hassler L, Hünenberger PH. Interaction of alginate single-chain polyguluronate segments with mono- and divalent metal cations: a comparative molecular dynamics study. MOLECULAR SIMULATION 2010. [DOI: 10.1080/08927021003752853] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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de Guzman RC, Ereifej ES, Broadrick KM, Rogers RA, VandeVord PJ. Alginate-matrigel microencapsulated schwann cells for inducible secretion of glial cell line derived neurotrophic factor. J Microencapsul 2009; 25:487-98. [PMID: 19238724 DOI: 10.1080/02652040802054745] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Controlled expression of glial cell line derived neurotrophic factor (Gdnf) can be integrated in the development of a system for repair of injured peripheral nerves. This delivery strategy was demonstrated via inducible Gdnf from microencapsulated cells in barium alginate. The Schwann cell line RT4-D6P2T was initially modified utilizing an ecdysone-based stable transfection system to produce RT4-Gdnf cells. During construct preparation, it was found that C6 cells (where Gdnf cDNA was isolated) make three Gdnf transcript variants. Additionally, the importance of 5' untranslated region to drive biologically-functional Gdnf synthesis was shown. Encapsulation of RT4-Gdnf in 1% alginate was then performed. It was determined that cells were able to survive at least 1 month in vitro using starting densities of 20, 200 and 2000 cells/capsule and barium ion concentrations of 10, 50, 100 and 200 mM. Most importantly, encapsulated cells secreted exogenous Gdnf upon ponasterone A induction. Mixture of basement membrane extract Matrigel to alginate promoted increased proliferation, cell spreading and Gdnf release. Finally, compression tests showed that cell-loaded microcapsules fractured at 75% diameter compression with 38 kPa of stress. Regulated Gdnf release from these microcapsules in vivo may potentially aid in the regeneration of damaged nerves.
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Affiliation(s)
- Roche C de Guzman
- Department of Biomedical Engineering, Wayne State University, Detroit, MI 48202, USA.
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Maiti S, Ray S, Mandal B, Sarkar S, Sa B. Carboxymethyl xanthan microparticles as a carrier for protein delivery. J Microencapsul 2008; 24:743-56. [DOI: 10.1080/02652040701647300] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Genes NG, Rowley JA, Mooney DJ, Bonassar LJ. Effect of substrate mechanics on chondrocyte adhesion to modified alginate surfaces. Arch Biochem Biophys 2004; 422:161-7. [PMID: 14759603 DOI: 10.1016/j.abb.2003.11.023] [Citation(s) in RCA: 156] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2003] [Revised: 11/17/2003] [Indexed: 11/20/2022]
Abstract
This study characterized the attachment of chondrocytes to RGD-functionalized alginate by examining the effect of substrate stiffness on cell attachment and morphology. Bovine chondrocytes were added to wells coated with 2% alginate or RGD-alginate. The alginate was crosslinked with divalent cations ranging from 1.25 to 62.5 mmol/g alginate. Attachment to RGD-alginate was 10-20 times higher than attachment to unmodified alginate and was significantly inhibited by antibodies to integrin subunits alpha3l and beta1, cytochalasin-D, and soluble RGD peptide. The equilibrium level and rate of attachment increased with crosslink density and substrate stiffness. Substrate stiffness also regulated chondrocyte morphology, which changed from a rounded shape with nebulous actin on weaker substrates to a predominantly flat morphology with actin stress fibers on stiffer substrates. The dependence of attachment on integrins and substrate stiffness suggests that chondrocyte integrins may play a role in sensing the mechanical properties of the matrices to which they are attached.
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Affiliation(s)
- Nicholas G Genes
- Center for Tissue Engineering, University of Massachusetts Medical School, Worcester, MA, USA
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Thimma RT, Tammishetti S. Barium chloride crosslinked carboxymethyl guar gum beads for gastrointestinal drug delivery. J Appl Polym Sci 2001. [DOI: 10.1002/app.2164] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Baba K, Yonese M, Kishimoto H. Mechanochemical Reaction of Calcium Alginate Hydrogel due to a Counterion Exchange. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1992. [DOI: 10.1246/bcsj.65.121] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Marinsky JA. Application of ion-selectivity predictions to the analysis of ion binding by gels. J Chromatogr A 1980. [DOI: 10.1016/s0021-9673(00)83855-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Seely GR, Hart RL. Absorption and circular dichroism spectra of methylene blue bound to alginate. Biopolymers 1979. [DOI: 10.1002/bip.1979.360181108] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Boucher E, Nisbet R. Application of the transfer-matrix method to equilibria of polymer reactions and adsorption from solution. Chem Phys Lett 1976. [DOI: 10.1016/0009-2614(76)80121-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Seely GR, Hart RL. The photosensitized oxidation of tyrosine derivatives in the presence of alginate. I: Reaction under homogeneous conditions. Photochem Photobiol 1976; 23:1-6. [PMID: 1265125 DOI: 10.1111/j.1751-1097.1976.tb06762.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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