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Rosenberg A, Solomonov A, Cohen H, Eliaz D, Kellersztein I, Brookstein O, Kozell A, Wang L, Wagner HD, Daraio C, Shimanovich U. From Basic Principles of Protein-Polysaccharide Association to the Rational Design of Thermally Sensitive Materials. ACS APPLIED MATERIALS & INTERFACES 2024; 16:9210-9223. [PMID: 38330192 PMCID: PMC10895586 DOI: 10.1021/acsami.3c12926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 01/22/2024] [Accepted: 01/23/2024] [Indexed: 02/10/2024]
Abstract
Biology resolves design requirements toward functional materials by creating nanostructured composites, where individual components are combined to maximize the macroscale material performance. A major challenge in utilizing such design principles is the trade-off between the preservation of individual component properties and emerging composite functionalities. Here, polysaccharide pectin and silk fibroin were investigated in their composite form with pectin as a thermal-responsive ion conductor and fibroin with exceptional mechanical strength. We show that segregative phase separation occurs upon mixing, and within a limited compositional range, domains ∼50 nm in size are formed and distributed homogeneously so that decent matrix collective properties are established. The composite is characterized by slight conformational changes in the silk domains, sequestering the hydrogen-bonded β-sheets as well as the emergence of randomized pectin orientations. However, most dominant in the composite's properties is the introduction of dense domain interfaces, leading to increased hydration, surface hydrophilicity, and increased strain of the composite material. Using controlled surface charging in X-ray photoelectron spectroscopy, we further demonstrate Ca ions (Ca2+) diffusion in the pectin domains, with which the fingerprints of interactions at domain interfaces are revealed. Both the thermal response and the electrical conductance were found to be strongly dependent on the degree of composite hydration. Our results provide a fundamental understanding of the role of interfacial interactions and their potential applications in the design of material properties, polysaccharide-protein composites in particular.
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Affiliation(s)
- Asaf Rosenberg
- Department of Molecular Chemistry and Materials Science, Faculty of Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Aleksei Solomonov
- Department of Molecular Chemistry and Materials Science, Faculty of Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Hagai Cohen
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Dror Eliaz
- Department of Molecular Chemistry and Materials Science, Faculty of Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Israel Kellersztein
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, United States
| | - Ori Brookstein
- Department of Molecular Chemistry and Materials Science, Faculty of Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Anna Kozell
- Department of Molecular Chemistry and Materials Science, Faculty of Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Linghui Wang
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, United States
| | - Hanoch Daniel Wagner
- Department of Molecular Chemistry and Materials Science, Faculty of Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Chiara Daraio
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, United States
| | - Ulyana Shimanovich
- Department of Molecular Chemistry and Materials Science, Faculty of Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel
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Bustos D, Guzmán L, Valdés O, Muñoz-Vera M, Morales-Quintana L, Castro RI. Development and Evaluation of Cross-Linked Alginate-Chitosan-Abscisic Acid Blend Gel. Polymers (Basel) 2023; 15:3217. [PMID: 37571107 PMCID: PMC10420979 DOI: 10.3390/polym15153217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/17/2023] [Accepted: 07/21/2023] [Indexed: 08/13/2023] Open
Abstract
Abscisic acid (ABA) has been proposed to play a significant role in the ripening of nonclimacteric fruit, stomatal opening, and response to abiotic stresses in plants, which can adversely affect crop growth and productivity. The biological effects of ABA are dependent on its concentration and signal transduction pathways. However, due to its susceptibility to the environment, it is essential to find a suitable biotechnological approach to coat ABA for its application. One promising approach is to utilize alginate and chitosan, two natural polysaccharides known for their strong affinity for water and their ability to act as coating agents. In this study, an alginate-chitosan blend was employed to develop an ABA cover. To achieve this, an alginate-chitosan-abscisic acid (ALG-CS-ABA) blend was prepared by forming ionic bonds or complexes with calcium ions, or through dual cross-linking. This was done by dripping a homogeneous solution of alginate-chitosan and ABA into a calcium chloride solution, resulting in the formation of the blend. By combining the unique properties of alginate, chitosan, and ABA, the resulting ALG-CS-ABA blend can potentially offer enhanced stability, controlled release, and improved protection of ABA. These characteristics make it a promising biotechnological approach for various applications, including the targeted delivery of ABA in agricultural practices or in the development of innovative plant-based products. Further evaluation and characterization of the ALG-CS-ABA blend will provide valuable insights into its potential applications in the fields of biomedicine, agriculture, and tissue engineering.
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Affiliation(s)
- Daniel Bustos
- Centro de Investigación de Estudios Avanzados del Maule (CIEAM), Vicerrectoría de Investigación y Postgrado, Universidad Católica del Maule, Talca 3460000, Chile; (D.B.); (O.V.)
- Laboratorio de Bioinformática y Química Computacional (LBQC), Escuela de Bioingeniería Médica, Facultad de Medicina, Universidad Católica del Maule, Talca 3460000, Chile
| | - Luis Guzmán
- Departamento de Bioquímica Clínica e Inmunohematología, Facultad de Ciencias de la Salud, Universidad de Talca, Avenida Lircay, s/n, Casilla 747–721, Talca 3460000, Chile;
| | - Oscar Valdés
- Centro de Investigación de Estudios Avanzados del Maule (CIEAM), Vicerrectoría de Investigación y Postgrado, Universidad Católica del Maule, Talca 3460000, Chile; (D.B.); (O.V.)
| | - Marcelo Muñoz-Vera
- Multidisciplinary Agroindustry Research Laboratory, Universidad Autónoma de Chile, Cinco Pte. N°1670, Talca 3467987, Chile;
| | - Luis Morales-Quintana
- Multidisciplinary Agroindustry Research Laboratory, Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Cinco Pte. N°1670, Talca 3467987, Chile
| | - Ricardo I. Castro
- Multidisciplinary Agroindustry Research Laboratory, Instituto de Ciencias Aplicadas, Facultad de Arquitectura, Construcción y Medio Ambiente, Universidad Autónoma de Chile, Cinco Pte. N°1670, Talca 3467987, Chile
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Lepilova O, Aleeva S, Koksharov S, Lepilova E. Supramolecular structure of banana peel pectin and its transformations during extraction by acidic methods. Int J Biol Macromol 2023; 242:124616. [PMID: 37146862 DOI: 10.1016/j.ijbiomac.2023.124616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 03/29/2023] [Accepted: 04/23/2023] [Indexed: 05/07/2023]
Abstract
In this study, the approaches to describe the mesh structure in the homogalacturonate domains of pectin and the effect of the native structure violations on the stabilization effectiveness of the oil-in-water emulsion were demonstrated. Pectin with a native structure was isolated from banana peel by enzymolysis of insoluble dietary fibres. This pectin was compared with pectins, which were isolated using hydrochloric and citric acids. The properties of pectins were analyzed taking into account the ratio of galacturonate units in nonsubstituted, methoxylated and calcium-pectate forms. The content of calcium-pectate units determines the density of inter-molecular crosslinking formation. The simulation results reflect the structure of rigid "egg-box" crosslinking blocks and flexible segments formed in native pectin mainly by methoxylated links. Hydrochloric acid extraction is accompanied by the destruction of the crosslinking blocks and depolymerization of pectin. Citric acid partially demineralizes the crosslinking blocks contributing to the release of macromolecular chains that do not have calcium-pectate units. The granulometric data indicates that the individual macromolecules take the thermodynamically stable form of a statistical tangle. Such conformation is an ideal basis for the formation of "host-guest" microcontainers having a hydrophilic shell and a hydrophobic core with an oil-soluble functional substance.
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Affiliation(s)
- Olga Lepilova
- Laboratory of Chemistry and Technology of Modified Fibrous Materials, G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Akademiceskaya 1, Ivanovo 153040, Russia.
| | - Svetlana Aleeva
- Laboratory of Chemistry and Technology of Modified Fibrous Materials, G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Akademiceskaya 1, Ivanovo 153040, Russia
| | - Sergey Koksharov
- Laboratory of Chemistry and Technology of Modified Fibrous Materials, G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Akademiceskaya 1, Ivanovo 153040, Russia
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Hakimi F, Jafari H, Hashemikia S, Shabani S, Ramazani A. Chitosan-polyethylene oxide/clay-alginate nanofiber hydrogel scaffold for bone tissue engineering: Preparation, physical characterization, and biomimetic mineralization. Int J Biol Macromol 2023; 233:123453. [PMID: 36709816 DOI: 10.1016/j.ijbiomac.2023.123453] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 01/20/2023] [Accepted: 01/24/2023] [Indexed: 01/27/2023]
Abstract
This study aimed to prepare a novel organic-mineral nanofiber/hydrogel of chitosan-polyethylene oxide (CS-PEO)/nanoclay-alginate (NC-ALG). The effects of NC particles on the mineralization and biocompatibility of the scaffold were investigated. A layer-by-layer scaffold composed of CS-PEO and NC-ALG was prepared. The morphological properties, swelling, biodegradation, and mechanical behaviors of the scaffolds were evaluated. Furthermore, scaffolds were characterized by the Fourier Transform Infrared (FTIR), the Field Emission Scanning Electron Microscope (FE-SEM), and X-Ray Diffraction (XRD) techniques. Bone-like apatite formation ability of the scaffolds was determined by the mineralization test in a simulated body fluid (M-SBF). In addition, the crystalline phase of bone-like apatite precipitates was investigated by XRD analysis. The cell compatibility of the scaffolds was also studied with osteoblastic cell line MC3T3-E1 by MTT assay. Notably, the incorporation of NC particles in CS-PEO/ALG scaffolds is suitable for bone tissue regeneration which enhances bone-like apatite formation. Further, the hemolysis and MTT assays demonstrated that CS-PEO/NC-ALG scaffold was compatible and safe for MC3T3 cells.
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Affiliation(s)
- Fatemeh Hakimi
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Hamed Jafari
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Samaneh Hashemikia
- Department of Textile Engineering, Urmia University of Technology, Urmia, Iran; Tissue Engineering and Biomaterials Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent 9000, Belgium
| | - Siamak Shabani
- Department of Surgery, School of Medicine, Ayatollah Mousavi Hospital, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Ali Ramazani
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran; Pharmaceutical Biotechnology Research Center, Zanjan University of Medical Sciences, Zanjan, Iran.
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5
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Agles AA, Bourg IC. Structure-Thermodynamic Relationship of a Polysaccharide Gel (Alginate) as a Function of Water Content and Counterion Type (Na vs Ca). J Phys Chem B 2023; 127:1828-1841. [PMID: 36791328 PMCID: PMC10159261 DOI: 10.1021/acs.jpcb.2c07129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Biofilms are the predominant mode of microbial life on Earth, and so a deep understanding of microbial communities─and their impacts on environmental processes─requires a firm understanding of biofilm properties. Because of the importance of biofilms to their microbial inhabitants, microbes have evolved different ways of engineering and reconfiguring the matrix of extracellular polymeric substances (EPS) that constitute the main non-living component of biofilms. This ability makes it difficult to distinguish between the biotic and abiotic origins of biofilm properties. An important route toward establishing this distinction has been the study of simplified models of the EPS matrix. This study builds on such efforts by using atomistic simulations to predict the nanoscale (≤10 nm scale) structure of a model EPS matrix and the sensitivity of this structure to interpolymer interactions and water content. To accomplish this, we use replica exchange molecular dynamics (REMD) simulations to generate all-atom configurations of ten 3.4 kDa alginate polymers at a range of water contents and Ca-Na ratios. Simulated systems are solvated with explicitly modeled water molecules, which allows us to capture the discrete structure of the hydrating water and to examine the thermodynamic stability of water in the gels as they are progressively dehydrated. Our primary findings are that (i) the structure of the hydrogels is highly sensitive to the identity of the charge-compensating cations, (ii) the thermodynamics of water within the gels (specific enthalpy and free energy) are, surprisingly, only weakly sensitive to cation identity, and (iii) predictions of the differential enthalpy and free energy of hydration include a short-ranged enthalpic term that promotes hydration and a longer-ranged (presumably entropic) term that promotes dehydration, where short and long ranges refer to distances shorter or longer than ∼0.6 nm between alginate strands.
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Affiliation(s)
- Avery A Agles
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Ian C Bourg
- Department of Civil and Environmental Engineering and High Meadows Environmental Institute, Princeton University, Princeton, New Jersey 08544, United States
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6
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Lerbret A, Assifaoui A. How Accurate Is the Egg-Box Model in Describing the Binding of Calcium to Polygalacturonate? A Molecular Dynamics Simulation Study. J Phys Chem B 2022; 126:10206-10220. [PMID: 36411084 DOI: 10.1021/acs.jpcb.2c05374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We performed molecular dynamics (MD) simulations of octameric galacturonate, GalA8, chains in the presence of Ca2+ in a ratio of R = [Ca2+]/[GalA] = 0.25 in order to determine to which extent the popular "egg-box model" (EBM) is able to describe the association between Ca2+ cations and polygalacturonate (polyGalA) chains. To this aim, we slightly revised the empirical parameters for the interaction between Ca2+ and the carboxylate oxygen atoms of GalA units so as to reproduce the experimental Ca2+-GalA association constant. We also defined an ad hoc order parameter, referred to as the egg-box score (EBS), that quantifies any deviation of the local coordination geometry of calcium cations with respect to an "ideal" EBM coordination geometry. The results reveal that the local coordination geometry of Ca2+ cations bound to polyGalA chains differs from that of the EBM. Moreover, polyGalA chains exhibit significant conformational disorder, and the cross-link angles formed between polyGalA chain axes are broadly distributed. Overall, the present study suggests that the EBM fails to describe accurately the association modes between calcium and polyGalA chains at a molar ratio R of 0.25.
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Affiliation(s)
- Adrien Lerbret
- Université Bourgogne Franche-Comté, Institut Agro, UMR PAM, 1 Esplanade Erasme, 21000Dijon, France
| | - Ali Assifaoui
- Université Bourgogne Franche-Comté, Institut Agro, UMR PAM, 1 Esplanade Erasme, 21000Dijon, France
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7
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Shen J, Dai Y, Xia F, Zhang X. Role of divalent metal ions in the function and application of hydrogels. Prog Polym Sci 2022. [DOI: 10.1016/j.progpolymsci.2022.101622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Madsen M, Rønne ME, Li R, Greco I, Ipsen R, Svensson B. Simulated gastrointestinal digestion of protein alginate complexes: effects of whey protein cross-linking and the composition and degradation of alginate. Food Funct 2022; 13:8375-8387. [PMID: 35848445 DOI: 10.1039/d2fo01256a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alginate and whey protein are common additives in food production improving storage stability, texture and nutritional value. Alginate forms complexes with whey protein and inhibits proteolysis by pepsin and trypsin, but the influence of alginate protein complexation on digestion is poorly understood. This study shows that whey protein cross-linking by microbial transglutaminase dramatically decreased particle size (2-fold) and viscosity of alginate protein complexes. The INFOGEST in vitro simulated gastrointestinal digestion of whey protein was increased by cross-linking (16%) and suppressed by alginate, most pronounced with high mannuronic acid and least with high guluronic acid content. Sizes of alginate whey protein particles increased during gastric digestion, whereas for cross-linked whey protein complexes the size initially increased, but returned to their initial size at the end of gastric digestion. While alginate is not degraded by human enzymes, a few gut bacteria were recently found to encode lyases and other enzymes metabolizing alginate. Alginate lyase added to the intestinal phase enhanced digestion (9%) as controlled by alginate composition and enzyme specificity. Thus we provide evidence that use of hydrocolloids and processing of protein strongly influence digestion and should be considered when using food additives.
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Affiliation(s)
- Mikkel Madsen
- Enzyme and Protein Chemistry, Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads, Building 224, DK-2800 Kgs. Lyngby, Denmark.
| | - Mette E Rønne
- Enzyme and Protein Chemistry, Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads, Building 224, DK-2800 Kgs. Lyngby, Denmark.
| | - Ruifen Li
- Department of Food Science, University of Copenhagen, DK-1958 Frederiksberg, Denmark
| | - Ines Greco
- Department of Food Science, University of Copenhagen, DK-1958 Frederiksberg, Denmark
| | - Richard Ipsen
- Department of Food Science, University of Copenhagen, DK-1958 Frederiksberg, Denmark
| | - Birte Svensson
- Enzyme and Protein Chemistry, Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads, Building 224, DK-2800 Kgs. Lyngby, Denmark.
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Askarieh M, Farshidi H, Rashidi A, Pourreza A, Alivand MS. Comparative evaluation of MIL-101(Cr)/calcium alginate composite beads as potential adsorbents for removing water vapor from air. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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Hills OJ, Yong CW, Scott AJ, Devine DA, Smith J, Chappell HF. Atomic-scale interactions between quorum sensing autoinducer molecules and the mucoid P. aeruginosa exopolysaccharide matrix. Sci Rep 2022; 12:7724. [PMID: 35545629 PMCID: PMC9095684 DOI: 10.1038/s41598-022-11499-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 04/18/2022] [Indexed: 12/22/2022] Open
Abstract
Mucoid Pseudomonas aeruginosa is a prevalent cystic fibrosis (CF) lung coloniser whose chronicity is associated with the formation of cation cross-linked exopolysaccharide (EPS) matrices, which form a biofilm that acts as a diffusion barrier, sequestering cationic and neutral antimicrobials, and making it extremely resistant to pharmacological challenge. Biofilm chronicity and virulence of the colony is regulated by quorum sensing autoinducers (QSAIs), small signalling metabolites that pass between bacteria, through the biofilm matrix, regulating genetic responses on a population-wide scale. The nature of how these molecules interact with the EPS is poorly understood, despite the fact that they must pass through EPS matrix to reach neighbouring bacteria. Interactions at the atomic-scale between two QSAI molecules, C4-HSL and PQS—both utilised by mucoid P. aeruginosa in the CF lung—and the EPS, have been studied for the first time using a combined molecular dynamics (MD) and density functional theory (DFT) approach. A large-scale, calcium cross-linked, multi-chain EPS molecular model was developed and MD used to sample modes of interaction between QSAI molecules and the EPS that occur at physiological equilibrium. The thermodynamic stability of the QSAI-EPS adducts were calculated using DFT. These simulations provide a thermodynamic rationale for the apparent free movement of C4-HSL, highlight key molecular functionality responsible for EPS binding and, based on its significantly reduced mobility, suggest PQS as a viable target for quorum quenching.
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Affiliation(s)
- Oliver J Hills
- School of Food Science & Nutrition, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
| | - Chin W Yong
- Daresbury Laboratory, Scientific Computing Department, Science and Technology Facilities Council, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK.,Division of Pharmacy and Optometry, School of Health Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Andrew J Scott
- School of Chemical & Process Engineering, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Deirdre A Devine
- School of Dentistry, University of Leeds, Clarendon Way, Leeds, LS2 9LU, UK
| | - James Smith
- School of Food Science & Nutrition, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Helen F Chappell
- School of Food Science & Nutrition, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
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Koksharov SA, Aleeva SV, Lepilova OV. Kinetics of the Sorption of Theophylline in Pectin Hydrogels with Different Structural Properties. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2022. [DOI: 10.1134/s003602442204015x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Structural Effects of pH Variation and Calcium Amount on the Microencapsulation of Glutathione in Alginate Polymers. BIOMED RESEARCH INTERNATIONAL 2022; 2022:5576090. [PMID: 35463991 PMCID: PMC9020975 DOI: 10.1155/2022/5576090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 03/22/2022] [Indexed: 11/17/2022]
Abstract
Reduced glutathione (GSH) has a high antioxidant capacity and is present in nearly every cell in the body, playing important roles in nutrient metabolism, antioxidant defense, and regulation of cellular events. Conversely, alginate is a macromolecule that has been widely used in the food, pharmaceutical, biomedical, and textile industries due to its biocompatibility, biodegradability, nontoxicity, and nonimmunogenicity as well as for its capabilities of retaining water and stabilizing emulsions. The primary goal of this study was to characterize and optimize the formation of a molecular complex of calcium alginate with GSH using a computational approach. As methods, we evaluated the influence of varying the amount of calcium cations at two different pHs on the structural stability of Ca2+-alginate complexes and thus on GSH liberation from these types of nanostructures. The results showed that complex stabilization depends on pH, with the system having a lower Ca2+ amount that produces the major GSH release. The systems at pH 2.5 retain more molecules within the calcium-alginate complex, which release GSH more slowly when embedded in more acidic media. In conclusions, this study demonstrates the dependence of the amount of calcium and the stabilizing effect of pH on the formation and subsequent maintenance of an alginate nanostructure. The results presented in this study can help to develop better methodological frameworks in industries where the release or capture of compounds, such as GSH in this case, depends on the conditions of the alginate nanoparticle.
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Koksharov SA, Aleeva SV, Lepilova OV. The Influence of the Structure of Pectin Substances of Flax Fodder Supplements on Absorption Binding of Azaheterocyclic Mycotoxins. RUSS J GEN CHEM+ 2022. [DOI: 10.1134/s1070363221130399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Makshakova O, Zykwinska A, Cuenot S, Colliec-Jouault S, Perez S. Three-dimensional structures, dynamics and calcium-mediated interactions of the exopolysaccharide, Infernan, produced by the deep-sea hydrothermal bacterium Alteromonas infernus. Carbohydr Polym 2022; 276:118732. [PMID: 34823768 DOI: 10.1016/j.carbpol.2021.118732] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 10/01/2021] [Accepted: 10/01/2021] [Indexed: 01/09/2023]
Abstract
The exopolysaccharide Infernan, from the bacterial strain GY785, has a complex repeating unit of nine monosaccharides established on a double-layer of sidechains. A cluster of uronic and sulfated monosaccharides confers to Infernan functional and biological activities. We characterized the 3-dimensional structures and dynamics along Molecular Dynamics trajectories and clustered the conformations in extended two-fold and five-fold helical structures. The electrostatic potential distribution over all the structures revealed negatively charged cavities explored for Ca2+ binding through quantum chemistry computation. The transposition of the model of Ca2+complexation indicates that the five-fold helices are the most favourable for interactions. The ribbon-like shape of two-fold helices brings neighbouring chains in proximity without steric clashes. The cavity chelating the Ca2+ of one chain is completed throughout the interaction of a sulfate group from the neighbouring chain. The resulting is a 'junction zone' based on unique chain-chain interactions governed by a heterotypic binding mode.
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Affiliation(s)
- Olga Makshakova
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky Str., 2/31, 420111 Kazan, Russian Federation.
| | - Agata Zykwinska
- Ifremer, Laboratoire Ecosystèmes Microbiens et Molécules Marines pour les Biotechnologies, 44311 Nantes, France.
| | - Stephane Cuenot
- Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, Nantes, France.
| | - Sylvia Colliec-Jouault
- Ifremer, Laboratoire Ecosystèmes Microbiens et Molécules Marines pour les Biotechnologies, 44311 Nantes, France.
| | - Serge Perez
- Centre de Recherches sur les Macromolécules Végétales, Université de Grenoble Alpes, Centre National de la Recherche Scientifique, Grenoble, France.
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Depta PN, Gurikov P, Schroeter B, Forgács A, Kalmár J, Paul G, Marchese L, Heinrich S, Dosta M. DEM-Based Approach for the Modeling of Gelation and Its Application to Alginate. J Chem Inf Model 2021; 62:49-70. [PMID: 34936761 DOI: 10.1021/acs.jcim.1c01076] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The gelation of biopolymers is of great interest in the material science community and has gained increasing relevance in the past few decades, especially in the context of aerogels─lightweight open nanoporous materials. Understanding the underlying gel structure and influence of process parameters is of great importance to predict material properties such as mechanical strength. In order to improve understanding of the gelation mechanism in aqueous solution, this work presents a novel approach based on the discrete element method for the mesoscale for modeling gelation of hydrogels, similarly to an extremely coarse-grained molecular dynamics (MD) approach. For this, polymer chains are abstracted as dimer units connected by flexible bonds and interactions between units and with the environment, that is, diffusion in implicit water, are described. The model is based on Langevin dynamics and includes an implicit probabilistic ion model to capture the effects of ion availability during ion-mediated gelation. The model components are fully derived and parameterized using literature data and theoretical considerations based on a simplified representation of atomistic processes. The presented model enables investigations of the higher-scale network formation during gelation on the micrometer and millisecond scale, which are beyond classical modeling approaches such as MD. As a model system, calcium-mediated alginate gelation is investigated including the influence of ion concentration, polymer composition, polymer concentration, and molecular weight. The model is verified against numerous literature data as well as own experimental results for the corresponding Ca-alginate hydrogels using nitrogen porosimetry, NMR cryoporometry, and small-angle neutron scattering. The model reproduces both bundle size and pore size distribution in a reasonable agreement with the experiments. Overall, the modeling approach paves the way to physically motivated design of alginate gels.
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Affiliation(s)
- Philipp Nicolas Depta
- Institute of Solids Process Engineering and Particle Technology, Hamburg University of Technology, 21073 Hamburg, Germany
| | - Pavel Gurikov
- Laboratory for Development and Modeling of Novel Nanoporous Materials, Hamburg University of Technology, 21 073 Hamburg, Germany
| | - Baldur Schroeter
- Institute for Thermal Separation Processes, Hamburg University of Technology, 21 073 Hamburg, Germany
| | - Attila Forgács
- Department of Inorganic and Analytical Chemistry, MTA-DE Redox and Homogeneous Catalytic Reaction Mechanisms Research Group, University of Debrecen, H-4032 Debrecen, Hungary
| | - József Kalmár
- Department of Inorganic and Analytical Chemistry, MTA-DE Redox and Homogeneous Catalytic Reaction Mechanisms Research Group, University of Debrecen, H-4032 Debrecen, Hungary
| | - Geo Paul
- Department of Science and Technological Innovation, Universitá del Piemonte Orientale, 15 121 Alessandria, Italy
| | - Leonardo Marchese
- Department of Science and Technological Innovation, Universitá del Piemonte Orientale, 15 121 Alessandria, Italy
| | - Stefan Heinrich
- Institute of Solids Process Engineering and Particle Technology, Hamburg University of Technology, 21073 Hamburg, Germany
| | - Maksym Dosta
- Institute of Solids Process Engineering and Particle Technology, Hamburg University of Technology, 21073 Hamburg, Germany
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16
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Li ZJ, Srebnik S, Rojas OJ. Revisiting Cation Complexation and Hydrogen Bonding of Single-Chain Polyguluronate Alginate. Biomacromolecules 2021; 22:4027-4036. [PMID: 34461721 DOI: 10.1021/acs.biomac.1c00840] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Modifying the properties of bio-based materials has garnered increasing interest in recent years. In related applications, the ability of alginates to complex with metal ions has been shown to be effective in liquid-to-gel transitions, useful in the development of foodstuff and pharma products as well as biomaterials, among others. However, despite its ubiquitous use, alginate behavior as far as interactions with cations is not fully understood. Hence, this study presents a detailed comparison of alginate's complexation with Na+ and Ca2+ and the involved intramolecular hydrogen bonding and biomolecular chain geometry. Using all-atom molecular dynamics simulations, we find that in contrast to accepted models, calcium cations strongly bind to alginate chains by disruption of hydrogen bonds between neighboring residues, stabilizing a left-hand, 3-fold helical chain structure that enhances chain stiffness. Hence, while present, the traditionally accepted egg-box binding mode was a minor subset of possible conformations. For a single chain, most of the cation binding occurred as single-cation interaction with a carboxyl group, without the coordination of other alginate oxygens. The monovalent Na+ ions were found to be mostly nonlocalized around alginate and therefore do not compete with intramolecular hydrogen bonding. The different binding modes observed for Na+ and Ca2+ contribute toward explaining the different solubility of sodium and calcium alginate.
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Affiliation(s)
- Zezhong John Li
- Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, British Columbia, Canada V6T 1Z3.,Laboratory of Sustainable and Catalytic Processing, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Simcha Srebnik
- Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, British Columbia, Canada V6T 1Z3
| | - Orlando J Rojas
- Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, British Columbia, Canada V6T 1Z3.,Bioproducts Institute and Departments of Chemistry and Wood Science, University of British Columbia, 2385 East Mall, Vancouver, British Columbia, Canada V6T 1Z4
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17
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Cation complexation by mucoid Pseudomonas aeruginosa extracellular polysaccharide. PLoS One 2021; 16:e0257026. [PMID: 34473773 PMCID: PMC8412252 DOI: 10.1371/journal.pone.0257026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 08/23/2021] [Indexed: 11/25/2022] Open
Abstract
Mucoid Pseudomonas aeruginosa is a prevalent cystic fibrosis (CF) lung colonizer, producing an extracellular matrix (ECM) composed predominantly of the extracellular polysaccharide (EPS) alginate. The ECM limits antimicrobial penetration and, consequently, CF sufferers are prone to chronic mucoid P. aeruginosa lung infections. Interactions between cations with elevated concentrations in the CF lung and the anionic EPS, enhance the structural rigidity of the biofilm and exacerbates virulence. In this work, two large mucoid P. aeruginosa EPS models, based on β-D-mannuronate (M) and β-D-mannuronate-α-L-guluronate systems (M-G), and encompassing thermodynamically stable acetylation configurations–a structural motif unique to mucoid P. aeruginosa–were created. Using highly accurate first principles calculations, stable coordination environments adopted by the cations have been identified and thermodynamic stability quantified. These models show the weak cross-linking capability of Na+ and Mg2+ ions relative to Ca2+ ions and indicate a preference for cation binding within M-G blocks due to the smaller torsional rearrangements needed to reveal stable binding sites. The geometry of the chelation site influences the stability of the resulting complexes more than electrostatic interactions, and the results show nuanced chemical insight into previous experimental observations.
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18
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Wang M, Chen L, Zhang Z. Potential applications of alginate oligosaccharides for biomedicine - A mini review. Carbohydr Polym 2021; 271:118408. [PMID: 34364551 DOI: 10.1016/j.carbpol.2021.118408] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 06/23/2021] [Accepted: 07/03/2021] [Indexed: 01/02/2023]
Abstract
Extensive research on marine algae, especially on their health-promoting properties, has been conducted. Various ingredients with potential biomedical applications have been discovered and extracted from marine algae. Alginate oligosaccharides are low molecular weight alginate polysaccharides present in cell walls of brown algae. They exhibit various health benefits such as anti-inflammatory, anti-microbial, anti-oxidant, anti-tumor and immunomodulation. Their low-toxicity, non-immunogenicity, and biodegradability make them an excellent material in biomedicine. Alginate oligosaccharides can be chemically or biochemically modified to enhance their biological activity and potential in pharmaceutical applications. This paper provides a brief overview on alginate oligosaccharides characteristics, modification patterns and highlights their vital health promoting properties.
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Affiliation(s)
- Mingpeng Wang
- College of Life Science, Qufu Normal University, Qufu 273100, China
| | - Lei Chen
- College of Life Science, Qufu Normal University, Qufu 273100, China.
| | - Zhaojie Zhang
- Department of Zoology and Physiology, University of Wyoming, Laramie, Wyoming, USA
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19
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Castro RI, Morales-Quintana L, Alvarado N, Guzmán L, Forero-Doria O, Valenzuela-Riffo F, Laurie VF. Design and Optimization of a Self-Assembling Complex Based on Microencapsulated Calcium Alginate and Glutathione (CAG) Using Response Surface Methodology. Polymers (Basel) 2021; 13:polym13132080. [PMID: 34202791 PMCID: PMC8271790 DOI: 10.3390/polym13132080] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 06/16/2021] [Accepted: 06/19/2021] [Indexed: 12/28/2022] Open
Abstract
The aim of this work was to characterize and optimize the formation of molecular complexes produced by the association of calcium alginate and reduced glutathione (GSH). The influence of varying concentrations of calcium and GSH on the production of microcapsules was analyzed using response surface methodology (RSM). The microcapsules were characterized by thermogravimetric analysis (TGA-DTG) and infrared spectroscopy (FTIR) in order to assess the hydration of the complexes, their thermal stability, and the presence of GSH within the complexes. The optimum conditions proposed by RSM to reach the maximum concentration of GSH within complexes were a 15% w/v of GSH and 1.25% w/v of CaCl2, with which a theorical concentration of 0.043 mg GSH per mg of CAG complex was reached.
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Affiliation(s)
- Ricardo I. Castro
- Multidisciplinary Agroindustry Research Laboratory, Carrera de Ingeniería en Construcción, Instituto de Ciencias Químicas Aplicadas, Universidad Autónoma de Chile, 5 Poniente 1670, Talca 3460000, Chile
- Correspondence: (R.I.C.); (V.F.L.)
| | - Luis Morales-Quintana
- Multidisciplinary Agroindustry Research Laboratory, Instituto de Ciencias Biomédicas, Universidad Autónoma de Chile, 5 Poniente 1670, Talca 3460000, Chile;
| | - Nancy Alvarado
- Instituto de Ciencias Químicas Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, Av. El Llano Subercaseaux 2801, San Miguel, Santiago 8910060, Chile;
| | - Luis Guzmán
- Department of Clinical Biochemistry and Immunohematology, Faculty of Health Sciences, Universidad de Talca, 2 Norte 685, Talca 3460000, Chile;
| | - Oscar Forero-Doria
- Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad Santo Tomás, Talca 3460000, Chile;
| | - Felipe Valenzuela-Riffo
- Programa de Doctorado en Ciencias con Mención Ingeniería Genética Vegetal, Instituto de Ciencias Biológicas, Universidad de Talca, 2 Norte 685, Talca 3460000, Chile;
- Institute of Biological Sciences, Universidad de Talca, Campus Talca, 2 Norte 285, Talca 3460000, Chile
| | - V. Felipe Laurie
- Facultad de Ciencias Agrarias, Universidad de Talca, 2 Norte 285, Talca 3460000, Chile
- Correspondence: (R.I.C.); (V.F.L.)
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20
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Majidi SS, Su Y, Jørgensen ML, Müller C, Forooghi P, Nie G, Chen M. Rayleigh Instability-Driven Coaxial Spinning of Knotted Cell-Laden Alginate Fibers as Artificial Lymph Vessels. ACS APPLIED MATERIALS & INTERFACES 2021; 13:22142-22149. [PMID: 33960773 DOI: 10.1021/acsami.1c00798] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Constructing artificial lymph vessels, which play a key role in the immune response, can provide new insights into immunology and disease pathologies. An immune tissue is a highly complex network that consists of lymph vessels, with a "beads-on-a-string" knotted structure. Herein, we present the facile and rapid fabrication of beads-on-a-string knotted cell-laden fibers using coaxial spinning of alginate by exploiting the Plateau-Rayleigh instability. It is shown how alterations in the flow rate and alginate concentration greatly affect the beads-on-a-string structure, rooted in the Plateau-Rayleigh instability theory. Biocompatibility was confirmed by the lactate dehydrogenase (LDH) assay and live/dead staining of the encapsulated human white blood cells. Finally, the encapsulated white blood cells were still functional as indicated by their anti-CD3 activation to secrete interleukin 2. The rapid fabrication of a cell-laden beads-on-a-string three-dimensional (3D) culture platform enables a crude mimicry of the lymph vessel structure. With joint expertise in immunology, microfluidics, and bioreactors, the technology may contribute to the mechanistic assay of human immune response in vitro and functional replacement.
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Affiliation(s)
- Sara Seidelin Majidi
- Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark
- Sino-Danish College (SDC), University of Chinese Academy of Sciences, Beijing 101400, China
| | - Yingchun Su
- Department of Biological and Chemical Engineering, Aarhus University, 8000 Aarhus C, Denmark
| | - Mathias Lindh Jørgensen
- Department of Biological and Chemical Engineering, Aarhus University, 8000 Aarhus C, Denmark
| | - Christoph Müller
- Department of Biological and Chemical Engineering, Aarhus University, 8000 Aarhus C, Denmark
| | - Pourya Forooghi
- Department of Mechanical and Production Engineering, Aarhus University, 8000 Aarhus C, Denmark
| | - Guangjun Nie
- National Center for Nanoscience and Technology, Beijing 100190, China
| | - Menglin Chen
- Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark
- Department of Biological and Chemical Engineering, Aarhus University, 8000 Aarhus C, Denmark
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21
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Gentry BM, Choi TH, Belfield WS, Keith JA. Computational predictions of metal-macrocycle stability constants require accurate treatments of local solvent and pH effects. Phys Chem Chem Phys 2021; 23:9189-9197. [PMID: 33885118 DOI: 10.1039/d1cp00611h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rational design of molecular chelating agents requires a detailed understanding of physicochemical ligand-metal interactions in solvent phase. Computational quantum chemistry methods should be able to provide this, but computational reports have shown poor accuracy when determining absolute binding constants for many chelating molecules. To understand why, we compare and benchmark static- and dynamics-based computational procedures for a range of monovalent and divalent cations binding to a conventional cryptand molecule: 2.2.2-cryptand ([2.2.2]). The benchmarking comparison shows that dynamics simulations using standard OPLS-AA classical potentials can reasonably predict binding constants for monovalent cations, but these procedures fail for divalent cations. We also consider computationally efficient static procedure using Kohn-Sham density functional theory (DFT) and cluster-continuum modeling that accounts for local microsolvation and pH effects. This approach accurately predicts binding energies for monovalent and divalent cations with an average error of 3.2 kcal mol-1 compared to experiment. This static procedure thus should be useful for future molecular screening efforts, and high absolute errors in the literature may be due to inadequate modeling of local solvent and pH effects.
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Affiliation(s)
- Brian M Gentry
- Department of Chemical Engineering, University of Pittsburgh, 3700 O'Hara Street, Pittsburgh, PA 15261, USA.
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22
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Siahaan P, Sasongko NA, Lusiana RA, Prasasty VD, Martoprawiro MA. The validation of molecular interaction among dimer chitosan with urea and creatinine using density functional theory: In application for hemodyalisis membrane. Int J Biol Macromol 2020; 168:339-349. [PMID: 33309669 DOI: 10.1016/j.ijbiomac.2020.12.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 11/16/2020] [Accepted: 12/06/2020] [Indexed: 01/06/2023]
Abstract
The formation of chitosan dimer and its interaction with urea and creatinine have been investigated at the density functional theory (DFT) level (B3LYP-D3/6-31++G**) to study the transport phenomena in hemodialysis membrane. The interaction energy of chitosan-creatinine and chitosan-urea complexes are in range -4 kcal/mol < interaction energy <-20 kcal/mol which were classified in medium hydrogen bond interaction. The chemical reactivity parameter proved that creatinine was more electrophilic and easier to bind chitosan than urea. The energy gap of HOMO-LUMO of chitosan-creatinine complex was lower than chitosan-urea complex that indicating chitosan-creatinine complex was more reactive and easier to transport electron than chitosan-urea complex. Moreover, the natural bond orbital (NBO) analysis showed a high contribution of hydrogen bond between chitosan-creatinine and chitosan-urea. The chitosan-creatinine interaction has a stronger hydrogen bond than chitosan-urea through the interaction O18-H34....N56 with stabilizing energy = -13 kcal/mol. The quantum theory atom in molecule (QTAIM) also supported NBO data. All data presented that creatinine can make hydrogen bond interaction stronger with chitosan than urea, that indicated creatinine easier to transport in the chitosan membrane than urea during hemodialysis process.
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Affiliation(s)
- Parsaoran Siahaan
- Department of Chemistry, Faculty Science and Mathematics, Diponegoro University, 50275 Semarang, Indonesia.
| | | | - Retno Ariadi Lusiana
- Department of Chemistry, Faculty Science and Mathematics, Diponegoro University, 50275 Semarang, Indonesia
| | - Vivitri Dewi Prasasty
- Faculty of Biotechnology, Atma Jaya Catholic University of Indonesia, 12930 Jakarta, Indonesia
| | - Muhamad Abdulkadir Martoprawiro
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, 40132 Bandung, Indonesia
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23
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Hentati F, Pierre G, Ursu AV, Vial C, Delattre C, Abdelkafi S, Michaud P. Rheological investigations of water-soluble polysaccharides from the Tunisian brown seaweed Cystoseira compressa. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2019.105631] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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24
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Bergonzi C, Remaggi G, Graiff C, Bergamonti L, Potenza M, Ossiprandi MC, Zanotti I, Bernini F, Bettini R, Elviri L. Three-Dimensional (3D) Printed Silver Nanoparticles/Alginate/Nanocrystalline Cellulose Hydrogels: Study of the Antimicrobial and Cytotoxicity Efficacy. NANOMATERIALS 2020; 10:nano10050844. [PMID: 32353965 PMCID: PMC7711489 DOI: 10.3390/nano10050844] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 04/21/2020] [Accepted: 04/25/2020] [Indexed: 12/20/2022]
Abstract
Here, a formulation of silver nanoparticles (AgNPs) and two natural polymers such as alginate (ALG) and nanocrystalline cellulose (CNC) was developed for the 3D printing of scaffolds with large surface area, improved mechanical resistance and sustained capabilities to promote antimicrobial and cytotoxic effects. Mechanical resistance, water content, morphological characterization and silver distribution of the scaffolds were provided. As for applications, a comparable antimicrobial potency against S. aureus and P. aeruginosa was demonstrated by in vitro tests as function of the AgNP concentration in the scaffold (Minimal Inhibitory Concentration value: 10 mg/mL). By reusing the 3D system the antimicrobial efficacy was demonstrated over at least three applications. The cytotoxicity effects caused by administration of AgNPs to hepatocellular carcinoma (HepG2) cell culture through ALG and ALG/CNC scaffold were discussed as a function of time and dose. Finally, the liquid chromatography-mass spectrometry (LC-MS) technique was used for targeted analysis of pro-apoptotic initiation and executioner caspases, anti-apoptotic and proliferative proteins and the hepatocyte growth factor, and provided insights about molecular mechanisms involved in cell death induction.
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Affiliation(s)
- Carlo Bergonzi
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/a, 43124 Parma, Italy
| | - Giulia Remaggi
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/a, 43124 Parma, Italy
| | - Claudia Graiff
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | - Laura Bergamonti
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | - Marianna Potenza
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
| | | | - Ilaria Zanotti
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/a, 43124 Parma, Italy
| | - Franco Bernini
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/a, 43124 Parma, Italy
| | - Ruggero Bettini
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/a, 43124 Parma, Italy
| | - Lisa Elviri
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/a, 43124 Parma, Italy
- Correspondence: ; Tel.: +39-0521-905-087; Fax: +39-0521-905-006
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25
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Jaafar MHM, Hamid KA. Chitosan-Coated Alginate Nanoparticles Enhanced Absorption Profile of Insulin Via Oral Administration. Curr Drug Deliv 2020; 16:672-686. [PMID: 31250754 DOI: 10.2174/1567201816666190620110748] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 05/10/2019] [Accepted: 05/18/2019] [Indexed: 12/24/2022]
Abstract
BACKGROUND In this study, four nanoparticle formulations (F1 to F4) comprising varying ratios of alginate, Pluronic F-68 and calcium chloride with a constant amount of insulin and chitosan as a coating material were prepared using polyelectrolyte complexation and ionotropic gelation methods to protect insulin against enzymatic degradation. METHODS This study describes the formulation design, optimisation, characterisation and evaluation of insulin concentration via oral delivery in rats. A reversed-phase high-performance liquid chromatography (HPLC) method was developed and validated to quantify insulin concentration in rat plasma. The proposed method produced a linear response over the concentration range of 0.39 to 50 µg/ml. RESULTS In vitro release study showed that dissolution of insulin in simulated gastric juice of pH 1.2 was prevented by alginate core and chitosan coating but rapidly released in simulated intestinal fluid (pH 6.8). Additionally, Formulation 3 (F3) has a particle size of 340.40 ± 2.39 nm with narrow uniformity exhibiting encapsulation efficiency (EE) of 72.78 ± 1.25 % produced highest absorption profile of insulin with a bioavailability of 40.23 ±1.29% and reduced blood glucose after its oral administration in rats. CONCLUSION In conclusion, insulin oral delivery system containing alginate and chitosan as a coating material has the ability to protect the insulin from enzymatic degradation thus enhance its absorption in the intestine. However, more work should be done for instance to involve human study to materialise this delivery system for human use.
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Affiliation(s)
- Mohd H M Jaafar
- Department of Pharmaceutics, Faculty of Pharmacy, Universiti Teknologi MARA, Cawangan Selangor, 42300 Puncak Alam, Malaysia
| | - Khuriah A Hamid
- Department of Pharmaceutics, Faculty of Pharmacy, Universiti Teknologi MARA, Cawangan Selangor, 42300 Puncak Alam, Malaysia
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26
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Maire du Poset A, Zitolo A, Cousin F, Assifaoui A, Lerbret A. Evidence for an egg-box-like structure in iron(ii)–polygalacturonate hydrogels: a combined EXAFS and molecular dynamics simulation study. Phys Chem Chem Phys 2020; 22:2963-2977. [DOI: 10.1039/c9cp04065j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The coordination of Fe(ii) with polygalacturonic acid (polyGalA) in Fe(ii)–polyGalA hydrogels exhibits an octahedral geometry that follows the “egg-box model”.
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Affiliation(s)
| | - Andrea Zitolo
- Synchrotron SOLEIL
- L’Orme des Merisiers
- BP 48 St Aubin
- 91192 Gif-sur-Yvette
- France
| | - Fabrice Cousin
- Laboratoire Léon Brillouin
- Université Paris-Saclay
- CEA-Saclay
- 91191 Gif-sur-Yvette
- France
| | - Ali Assifaoui
- Univ. Bourgogne Franche-Comté
- AgroSup Dijon
- PAM UMR A 02.102
- F-21000 Dijon
- France
| | - Adrien Lerbret
- Univ. Bourgogne Franche-Comté
- AgroSup Dijon
- PAM UMR A 02.102
- F-21000 Dijon
- France
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27
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Byun C, Zheng Y, Pierce A, Wagner WL, Scheller HV, Mohnen D, Ackermann M, Mentzer SJ. The Effect of Calcium on the Cohesive Strength and Flexural Properties of Low-Methoxyl Pectin Biopolymers. Molecules 2019; 25:E75. [PMID: 31878302 PMCID: PMC6982731 DOI: 10.3390/molecules25010075] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 12/13/2019] [Accepted: 12/18/2019] [Indexed: 11/23/2022] Open
Abstract
Abstract: Pectin binds the mesothelial glycocalyx of visceral organs, suggesting its potential role as a mesothelial sealant. To assess the mechanical properties of pectin films, we compared pectin films with a less than 50% degree of methyl esterification (low-methoxyl pectin, LMP) to films with greater than 50% methyl esterification (high-methoxyl pectin, HMP). LMP and HMP polymers were prepared by step-wise dissolution and high-shear mixing. Both LMP and HMP films demonstrated a comparable clear appearance. Fracture mechanics demonstrated that the LMP films had a lower burst strength than HMP films at a variety of calcium concentrations and hydration states. The water content also influenced the extensibility of the LMP films with increased extensibility (probe distance) with an increasing water content. Similar to the burst strength, the extensibility of the LMP films was less than that of HMP films. Flexural properties, demonstrated with the 3-point bend test, showed that the force required to displace the LMP films increased with an increased calcium concentration (p < 0.01). Toughness, here reflecting deformability (ductility), was variable, but increased with an increased calcium concentration. Similarly, titrations of calcium concentrations demonstrated LMP films with a decreased cohesive strength and increased stiffness. We conclude that LMP films, particularly with the addition of calcium up to 10 mM concentrations, demonstrate lower strength and toughness than comparable HMP films. These physical properties suggest that HMP has superior physical properties to LMP for selected biomedical applications.
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Affiliation(s)
- Christine Byun
- Laboratory of Adaptive and Regenerative Biology, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA; (C.B.); (Y.Z.); (A.P.); (W.L.W.)
| | - Yifan Zheng
- Laboratory of Adaptive and Regenerative Biology, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA; (C.B.); (Y.Z.); (A.P.); (W.L.W.)
| | - Aidan Pierce
- Laboratory of Adaptive and Regenerative Biology, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA; (C.B.); (Y.Z.); (A.P.); (W.L.W.)
| | - Willi L. Wagner
- Laboratory of Adaptive and Regenerative Biology, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA; (C.B.); (Y.Z.); (A.P.); (W.L.W.)
- Department of Diagnostic and Interventional Radiology, Translational Lung Research Center, University of Heidelberg, 69115 Heidelberg, Germany
| | - Henrik V. Scheller
- Joint BioEnergy Institute, Emeryville CA and the Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94701, USA;
| | - Debra Mohnen
- Complex Carbohydrate Research Center and Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA;
| | - Maximilian Ackermann
- Institute of Functional and Clinical Anatomy, University Medical Center of the Johannes Gutenberg-University Mainz, 55131 Mainz, Germany;
| | - Steven J. Mentzer
- Laboratory of Adaptive and Regenerative Biology, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA; (C.B.); (Y.Z.); (A.P.); (W.L.W.)
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Campbell KT, Wysoczynski K, Hadley DJ, Silva EA. Computational-Based Design of Hydrogels with Predictable Mesh Properties. ACS Biomater Sci Eng 2019; 6:308-319. [PMID: 33313390 DOI: 10.1021/acsbiomaterials.9b01520] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Hydrogel systems are an appealing class of therapeutic delivery vehicles, though it can be challenging to design hydrogels that maintain desired spatiotemporal presentation of therapeutic cargo. In this work, we propose a different approach in which computational tools are developed that creates a theoretical representation of the hydrogel polymer network to design hydrogels with predefined mesh properties critical for controlling therapeutic delivery. We postulated and confirmed that the computational model could incorporate properties of alginate polymers, including polymer content, monomer composition and polymer chain radius, to accurately predict cross-link density and mesh size for a wide range of alginate hydrogels. Additionally, the simulations provided a robust strategy to determine the mesh size distribution and identified properties to control the mesh size of alginate hydrogels. Furthermore, the model was validated for additional hydrogel systems and provided a high degree of correlation (R2 > 0.95) to the mesh sizes determined for both fibrin and polyethylene glycol (PEG) hydrogels. Finally, a full factorial and Box-Behnken design of experiments (DOE) approach utilized in combination with the computational model predicted that the mesh size of hydrogels could be varied from approximately 5 nm to 5 μm through controlling properties of the polymer network. Overall, this computational model of the hydrogel polymer network provides a rapid and accessible strategy to predict hydrogel mesh properties and ultimately design hydrogel systems with desired mesh properties for potential therapeutic applications.
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Affiliation(s)
- Kevin T Campbell
- Department of Biomedical Engineering, University of California Davis, Davis, California, United States of America
| | - Kajetan Wysoczynski
- Department of Biomedical Engineering, University of California Davis, Davis, California, United States of America
| | - Dustin J Hadley
- Department of Biomedical Engineering, University of California Davis, Davis, California, United States of America
| | - Eduardo A Silva
- Department of Biomedical Engineering, University of California Davis, Davis, California, United States of America
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29
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Zhang X, Wang L, Weng L, Deng B. Strontium ion substituted alginate‐based hydrogel fibers and its coordination binding model. J Appl Polym Sci 2019. [DOI: 10.1002/app.48571] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Xiaolin Zhang
- Laboratory for Advanced Nonwoven Technology, Key Laboratory of Eco‐TextilesMinistry of Education, Jiangnan University Wuxi 214122 People's Republic of China
| | - Lanlan Wang
- Laboratory for Advanced Nonwoven Technology, Key Laboratory of Eco‐TextilesMinistry of Education, Jiangnan University Wuxi 214122 People's Republic of China
| | - Lin Weng
- Okinawa Institute of Science and Technology, Nanoparticles by Design Unit Okinawa 904‐0495 Japan
| | - Bingyao Deng
- Laboratory for Advanced Nonwoven Technology, Key Laboratory of Eco‐TextilesMinistry of Education, Jiangnan University Wuxi 214122 People's Republic of China
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30
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Li Z, Behrens AM, Ginat N, Tzeng SY, Lu X, Sivan S, Langer R, Jaklenec A. Biofilm-Inspired Encapsulation of Probiotics for the Treatment of Complex Infections. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1803925. [PMID: 30328144 DOI: 10.1002/adma.201803925] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 08/25/2018] [Indexed: 05/18/2023]
Abstract
The emergence of antimicrobial resistance poses a major challenge to healthcare. Probiotics offer a potential alternative treatment method but are often incompatible with antibiotics themselves, diminishing their overall therapeutic utility. This work uses biofilm-inspired encapsulation of probiotics to confer temporary antibiotic protection and to enable the coadministration of probiotics and antibiotics. Probiotics are encapsulated within alginate, a crucial component of pseudomonas biofilms, based on a simple two-step alginate cross-linking procedure. Following exposure to the antibiotic tobramycin, the growth and metabolic activity of encapsulated probiotics are unaffected by tobramycin, and they show a four-log survival advantage over free probiotics. This results from tobramycin sequestration on the periphery of alginate beads which prevents its diffusion into the core but yet allows probiotic byproducts to diffuse outward. It is demonstrated that this approach using tobramycin combined with encapsulated probiotic has the ability to completely eradicate methicillin-resistant Staphylococcus aureus and Pseudomonas aeruginosa in coculture, the two most widely implicated bacteria in chronic wounds.
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Affiliation(s)
- Zhihao Li
- David H. Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology 500 Main Street, Cambridge, MA, 02139, USA
| | - Adam M Behrens
- David H. Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology 500 Main Street, Cambridge, MA, 02139, USA
| | - Nitzan Ginat
- David H. Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology 500 Main Street, Cambridge, MA, 02139, USA
| | - Stephany Y Tzeng
- David H. Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology 500 Main Street, Cambridge, MA, 02139, USA
| | - Xueguang Lu
- David H. Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology 500 Main Street, Cambridge, MA, 02139, USA
| | - Sarit Sivan
- Department of Biotechnology Engineering, Ort Braude College, P.O. Box 78, Karmiel, 21982, Israel
| | - Robert Langer
- David H. Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology 500 Main Street, Cambridge, MA, 02139, USA
| | - Ana Jaklenec
- David H. Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology 500 Main Street, Cambridge, MA, 02139, USA
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31
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Costa MP, Prates LM, Baptista L, Cruz MT, Ferreira IL. Interaction of polyelectrolyte complex between sodium alginate and chitosan dimers with a single glyphosate molecule: A DFT and NBO study. Carbohydr Polym 2018; 198:51-60. [DOI: 10.1016/j.carbpol.2018.06.052] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 05/15/2018] [Accepted: 06/12/2018] [Indexed: 01/08/2023]
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32
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Sadeghi-Mehr A, Raudsepp P, Brüggemann DA, Lautenschlaeger R, Drusch S. Dynamic rheology, microstructure and texture properties of model porcine meat batter as affected by different cold-set binding systems. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2017.11.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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33
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Panczyk K, Gaweda K, Drach M, Plazinski W. Extension of the GROMOS 56a6 CARBO/CARBO_R Force Field for Charged, Protonated, and Esterified Uronates. J Phys Chem B 2018; 122:3696-3710. [PMID: 29558620 DOI: 10.1021/acs.jpcb.7b11548] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
An extension of the GROMOS 56a6CARBO/CARBO_R force field for hexopyranose-based carbohydrates is presented. The additional parameters describe the conformational properties of uronate residues. The three distinct chemical states of the carboxyl group are considered: deprotonated (negatively charged), protonated (neutral), and esterified (neutral). The parametrization procedure was based on quantum-chemical calculations, and the resulting parameters were tested in the context of (i) flexibility of the pyranose rings under different pH conditions, (ii) conformation of the glycosidic linkage of the (1 → 4)-type for uronates with different chemical states of carboxyl moieties, (iii) conformation of the exocyclic (i.e., carboxylate and lactol) moieties, and (iv) structure of the Ca2+-linked chain-chain complexes of uronates. The presently proposed parameters in combination with the 56a6CARBO/CARBO_R set can be used to describe the naturally occurring polyuronates, composed either of homogeneous (e.g., glucuronans) or heterogeneous (e.g., pectins, alginates) segments. The results of simulations relying on the new set of parameters indicate that the conformation of glycosidic linkage is nearly unaffected by the chemical state of the carboxyl group, in contrary to the ring conformational equilibria. The calculations for the poly(α-d-galacturonate)-Ca2+ and poly(α-l-guluronate)-Ca2+ complexes show that both parallel and anitiparallel arrangements of uronate chains are possible but differ in several structural aspects.
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Affiliation(s)
- Karina Panczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry , Polish Academy of Sciences , ul. Niezapominajek 8 , 30-239 Cracow , Poland
| | - Karolina Gaweda
- Jerzy Haber Institute of Catalysis and Surface Chemistry , Polish Academy of Sciences , ul. Niezapominajek 8 , 30-239 Cracow , Poland
| | - Mateusz Drach
- Department of Theoretical Chemistry, Faculty of Chemistry , M. Curie-Sklodowska University , pl. M. Curie-Sklodowskiej 3 , 20-031 Lublin , Poland
| | - Wojciech Plazinski
- Jerzy Haber Institute of Catalysis and Surface Chemistry , Polish Academy of Sciences , ul. Niezapominajek 8 , 30-239 Cracow , Poland
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34
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He X, Abdoli L, Li H. Participation of copper ions in formation of alginate conditioning layer: Evolved structure and regulated microbial adhesion. Colloids Surf B Biointerfaces 2018; 162:220-227. [DOI: 10.1016/j.colsurfb.2017.11.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 10/21/2017] [Accepted: 11/23/2017] [Indexed: 10/18/2022]
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35
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Alginate Production from Marine Macroalgae, with Emphasis on Kelp Farming. SPRINGER SERIES IN BIOMATERIALS SCIENCE AND ENGINEERING 2018. [DOI: 10.1007/978-981-10-6910-9_2] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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36
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Aoyagi M, Hiraguri T. Ultrasound Phantom Using Sodium Alginate as a Gelling Agent. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2017; 36:2345-2353. [PMID: 28543374 DOI: 10.1002/jum.14252] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Accepted: 01/29/2017] [Indexed: 06/07/2023]
Abstract
For medical workers, ultrasound phantoms for human soft tissue are used not only for accuracy management of ultrasound diagnosis but also to aid ultrasound-guided needle and blind catheter insertion training without risk to real patients. For the phantoms, ultrasound characteristics and a texture are required to mimic the human soft tissue. The proposed phantom was composed of sodium alginate, calcium sulfate dihydrate, trisodium phosphate 12-hydrate, glycerol, and water. The propagation speed, attenuation coefficient, acoustic impedance, and texture of the proposed phantom were almost the same as those of human soft tissue. Expensive chemicals and special equipment are not required.
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Affiliation(s)
- Minoru Aoyagi
- Department of Electrical and Electronics Engineering, Nippon Institute of Technology, Saitama, Japan
| | - Tomomi Hiraguri
- Faculty of Health Sciences, Tokoha University, Shizuoka, Japan
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37
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Pérez-Madrigal MM, Torras J, Casanovas J, Häring M, Alemán C, Díaz DD. Paradigm Shift for Preparing Versatile M2+-Free Gels from Unmodified Sodium Alginate. Biomacromolecules 2017; 18:2967-2979. [DOI: 10.1021/acs.biomac.7b00934] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Maria M. Pérez-Madrigal
- Institut
für Organische Chemie, Universität Regensburg, Universitätsstr.
31, D-93053 Regensburg, Germany
| | | | - Jordi Casanovas
- Departament
de Química, EPS, Universitat de Lleida, Jaume II 69, 25001 Lleida, Spain
| | - Marleen Häring
- Institut
für Organische Chemie, Universität Regensburg, Universitätsstr.
31, D-93053 Regensburg, Germany
| | | | - David Díaz Díaz
- Institut
für Organische Chemie, Universität Regensburg, Universitätsstr.
31, D-93053 Regensburg, Germany
- IQAC−CSIC, Jordi Girona 18-26, E-08034 Barcelona, Spain
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38
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Shoaib T, Carmichael A, Corman RE, Shen Y, Nguyen TH, Ewoldt RH, Espinosa-Marzal RM. Self-adaptive hydrogels to mineralization. SOFT MATTER 2017; 13:5469-5480. [PMID: 28812774 DOI: 10.1039/c7sm01058c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Mineralized biological tissues, whose behavior can range from rigid to compliant, are an essential component of vertebrates and invertebrates. Little is known about how the behavior of mineralized yet compliant tissues can be tuned by the degree of mineralization. In this work, a synthesis route to tune the structure and mechanical response of agarose gels via ionic crosslinking and mineralization has been developed. A combination of experimental techniques demonstrates that crosslinking via cooperative hydrogen bonding in agarose gels is disturbed by calcium ions, but they promote ionic crosslinking that modifies the agarose network. Further, it is shown that the rearrangement of the hydrogel network helps to accommodate precipitated minerals into the network -in other words, the hydrogel self-adapts to the precipitated mineral- while maintaining the viscoelastic behavior of the hydrogel, despite the reinforcement caused by mineralization. This work not only provides a synthesis route to design biologically inspired soft composites, but also helps to understand the change of properties that biomineralization can cause to biological tissues, organisms and biofilms.
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Affiliation(s)
- Tooba Shoaib
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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39
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Bajpai SK, Pathak V, Kirar N. Extended release of Gliclazide from highly stabilized calcium alginate/poly(acrylamide) beads for diabetes management. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2017. [DOI: 10.1080/10601325.2017.1320752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- S. K. Bajpai
- Polymer Research Laboratory, Govt. Model Science College (Autonomous), Jabalpur, India
| | - Vandana Pathak
- Polymer Research Laboratory, Govt. Model Science College (Autonomous), Jabalpur, India
| | - Narendra Kirar
- Polymer Research Laboratory, Govt. Model Science College (Autonomous), Jabalpur, India
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40
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Lead-binding capacity of calcium pectates with different molecular weight. Int J Biol Macromol 2017; 97:526-535. [DOI: 10.1016/j.ijbiomac.2017.01.065] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 12/27/2016] [Accepted: 01/12/2017] [Indexed: 11/15/2022]
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41
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Sequence-dependent association of alginate with sodium and calcium counterions. Carbohydr Polym 2017; 157:1144-1152. [DOI: 10.1016/j.carbpol.2016.10.081] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 10/09/2016] [Accepted: 10/15/2016] [Indexed: 11/18/2022]
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42
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Di Giacomo R, Bonanomi L, Costanza V, Maresca B, Daraio C. Biomimetic temperature-sensing layer for artificial skins. Sci Robot 2017; 2:2/3/eaai9251. [DOI: 10.1126/scirobotics.aai9251] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 12/28/2016] [Indexed: 12/29/2022]
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43
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Bowman KA, Aarstad OA, Stokke BT, Skjåk-Bræk G, Round AN. Sliding Contact Dynamic Force Spectroscopy Method for Interrogating Slowly Forming Polymer Cross-Links. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12814-12822. [PMID: 27813412 DOI: 10.1021/acs.langmuir.6b03414] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Dynamic single-molecule force spectroscopy (SMFS), conducted most commonly using AFM, has become a widespread and valuable tool for understanding the kinetics and thermodynamics of fundamental molecular processes such as ligand-receptor interactions and protein unfolding. Where slowly forming bonds are responsible for the primary characteristics of a material, as is the case in cross-links in some polymer gels, care must be taken to ensure that a fully equilibrated bond has first formed before its rupture can be interpreted. Here we introduce a method, sliding contact force spectroscopy (SCFS), that effectively eliminates the kinetics of bond formation from the measurement of bond rupture. In addition, it permits bond rupture measurements in systems where one of the binding partners may be introduced into solution prior to binding without tethering to a surface. Taking as an example of a slowly forming bond, the "eggbox" junction cross-links between oligoguluronic acid chains (oligoGs) in the commercially important polysaccharide alginate, we show that SCFS accurately measures the equilibrated bond strength of the cross-link when one chain is introduced into the sample solution without tethering to a surface. The results validate the SCFS technique for performing single-molecule force spectroscopy experiments and show that it has advantages in cases where the bond to be studied forms slowly and where tethering of one of the binding partners is impractical.
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Affiliation(s)
- Kate A Bowman
- School of Pharmacy, University of East Anglia , Norwich, United Kingdom
| | | | | | | | - Andrew N Round
- School of Pharmacy, University of East Anglia , Norwich, United Kingdom
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44
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Single molecule investigation of the onset and minimum size of the calcium-mediated junction zone in alginate. Carbohydr Polym 2016; 148:52-60. [DOI: 10.1016/j.carbpol.2016.04.043] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 04/08/2016] [Accepted: 04/09/2016] [Indexed: 02/04/2023]
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45
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Hecht H, Srebnik S. Structural Characterization of Sodium Alginate and Calcium Alginate. Biomacromolecules 2016; 17:2160-7. [PMID: 27177209 DOI: 10.1021/acs.biomac.6b00378] [Citation(s) in RCA: 255] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Alginate readily aggregates and forms a physical gel in the presence of cations. The association of the chains, and ultimately gel structure and mechanics, depends not only on ion type, but also on the sequence and composition of the alginate chain that ultimately determines its stiffness. Chain flexibility is generally believed to decrease with guluronic residue content, but it is also known that both polymannuronate and polyguluronate blocks are stiffer than heteropolymeric blocks. In this work, we use atomistic molecular dynamics simulation to primarily explore the association and aggregate structure of different alginate chains under various Ca(2+) concentrations and for different alginate chain composition. We show that Ca(2+) ions in general facilitate chain aggregation and gelation. However, aggregation is predominantly affected by alginate monomer composition, which is found to correlate with chain stiffness under certain solution conditions. In general, greater fractions of mannuronic monomers are found to increase chain flexibility of heteropolymer chains. Furthermore, differences in chain guluronic acid content are shown to lead to different interchain association mechanisms, such as lateral association, zipper mechanism, and entanglement, where the mannuronic residues are shown to operate as an elasticity moderator and therefore promote chain association.
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Affiliation(s)
- Hadas Hecht
- The Interdisciplinary Program in Polymer Engineering and ‡Department of Chemical Engineering, Technion - Israel Institute of Technology , Haifa, Israel 32000
| | - Simcha Srebnik
- The Interdisciplinary Program in Polymer Engineering and ‡Department of Chemical Engineering, Technion - Israel Institute of Technology , Haifa, Israel 32000
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46
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Sensory, physicochemical and microbiological properties of dry-cured formed ham: comparison of four different binding systems. Eur Food Res Technol 2016. [DOI: 10.1007/s00217-016-2641-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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47
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Assifaoui A, Lerbret A, Uyen HTD, Neiers F, Chambin O, Loupiac C, Cousin F. Structural behaviour differences in low methoxy pectin solutions in the presence of divalent cations (Ca(2+) and Zn(2+)): a process driven by the binding mechanism of the cation with the galacturonate unit. SOFT MATTER 2015; 11:551-560. [PMID: 25425418 DOI: 10.1039/c4sm01839g] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this paper, we compare the interactions between low methoxy pectin (LMP) and either Ca(2+) or Zn(2+) in semi-dilute solutions. Intrinsic viscosity and turbidity measurements reveal that pectin-calcium solutions are more viscous, but yet less turbid, than pectin-zinc ones. To get a molecular understanding of the origin of this rather unexpected behavior, we further performed isothermal titration calorimetry, small angle neutron scattering experiments, as well as molecular dynamics simulations. Our results suggest that calcium cations induce the formation of a more homogeneous network of pectin than zinc cations do. The molecular dynamics simulations indicate that this difference could originate from the way the two cations bind to the galacturonate unit (Gal), the main component of LMP: zinc interacts with both carboxylate and hydroxyl groups of Gal, in a similar way to that described in the so-called egg-box model, whereas calcium only interacts with carboxylate groups. This different binding behavior seems to arise from the stronger interaction of water molecules with zinc than with calcium. Accordingly, galacturonate chains are more loosely associated with each other in the presence of Ca(2+) than with Zn(2+). This may improve their ability to form a gel, not only by dimerization, but also by the formation of point-like cross-links. Overall, our results show that zinc binds less easily to pectin than calcium does.
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Affiliation(s)
- Ali Assifaoui
- UMR PAM, AgroSup Dijon - Université de Bourgogne, Dijon, France.
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48
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Plazinski W, Drach M. Binding of bivalent metal cations by α-l-guluronate: insights from the DFT-MD simulations. NEW J CHEM 2015. [DOI: 10.1039/c4nj02206h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Theoretically calculated free energy profiles give insight into the molecular aspects of metal ion binding by uronate biopolymers.
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Affiliation(s)
- Wojciech Plazinski
- Institute of Catalysis and Surface Chemistry
- Polish Academy of Sciences
- 30-239 Cracow
- Poland
| | - Mateusz Drach
- Department of Theoretical Chemistry
- Faculty of Chemistry
- UMCS
- 20-031 Lublin
- Poland
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49
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Stewart MB, Gray SR, Vasiljevic T, Orbell JD. The role of poly-M and poly-GM sequences in the metal-mediated assembly of alginate gels. Carbohydr Polym 2014; 112:486-93. [DOI: 10.1016/j.carbpol.2014.06.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 05/28/2014] [Accepted: 06/01/2014] [Indexed: 10/25/2022]
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50
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Agulhon P, Robitzer M, Habas JP, Quignard F. Influence of both cation and alginate nature on the rheological behavior of transition metal alginate gels. Carbohydr Polym 2014; 112:525-31. [DOI: 10.1016/j.carbpol.2014.05.097] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 05/27/2014] [Accepted: 05/28/2014] [Indexed: 11/30/2022]
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