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Karg A, Kuznetsov V, Helfricht N, Lippitz M, Papastavrou G. Electrochemical grippers based on the tuning of surface forces for applications in micro- and nanorobotics. Sci Rep 2023; 13:7885. [PMID: 37193686 DOI: 10.1038/s41598-023-33654-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Accepted: 04/17/2023] [Indexed: 05/18/2023] Open
Abstract
Existing approaches to robotic manipulation often rely on external mechanical devices, such as hydraulic and pneumatic devices or grippers. Both types of devices can be adapted to microrobots only with difficulties and for nanorobots not all. Here, we present a fundamentally different approach that is based on tuning the acting surface forces themselves rather than applying external forces by grippers. Tuning of forces is achieved by the electrochemical control of an electrode's diffuse layer. Such electrochemical grippers can be integrated directly into an atomic force microscope, allowing for 'pick and place' procedures typically used in macroscopic robotics. Due to the low potentials involved, small autonomous robots could as well be equipped with these electrochemical grippers that will be particularly useful in soft robotics as well as nanorobotics. Moreover, these grippers have no moving parts and can be incorporated in new concepts for actuators. The concept can easily be scaled down and applied to a wide range of objects, such as colloids, proteins, and macromolecules.
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Affiliation(s)
- A Karg
- Physical Chemistry II, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
| | - V Kuznetsov
- Physical Chemistry II, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
| | - N Helfricht
- Physical Chemistry II, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
| | - M Lippitz
- Experimental Physics III, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
| | - G Papastavrou
- Physical Chemistry II, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany.
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2
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Sychev D, Schubotz S, Besford QA, Fery A, Auernhammer GK. Critical Analysis of Adhesion Work Measurements from AFM-based Techniques for Soft Contact. J Colloid Interface Sci 2023; 642:216-226. [PMID: 37004256 DOI: 10.1016/j.jcis.2023.03.139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 03/17/2023] [Accepted: 03/21/2023] [Indexed: 03/28/2023]
Abstract
HYPOTHESIS The work of adhesion is a thermodynamic quantity that is frequently measured by atomic force microscopy (AFM). Determination of the work of adhesion requires quasi-equilibrium measurements, where we address the question of to what extent atomic force microscopy qualifies for quasi-equilibrium measurements. EXPERIMENT To measure the work of adhesion, we combined soft colloidal probe AFM (SCP AFM) with reflection interference contrast microscopy (RICM). This allowed us to extract the work of adhesion either from the pull-off force or from the contact radius. With these methods, we investigated the adhesion behavior of poly(N-isopropylacrylamide) (PNIPAM) polymer brushes in the swollen and solvent-induced collapsed state by systematically analyzing contact radii and adhesive forces. FINDINGS In the swollen state, the adhesion to the PNIPAM brush was fivefold larger and exhibited significant time dependencies when measured with SCP AFM. A strong rate dependence of the pull-off force method was indicative of a non-equilibrium process. In order to reliably determine the equilibrium work of adhesion, the contact radius method was found to be the better because it is not rate dependent. Our work highlights the important benefits of using optical measurements to determine the contact radius when deriving the works of adhesion between colloidal probes and polymer brush surfaces.
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3
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Punjataewakupt A, Aramwit P. Wound dressing adherence: a review. J Wound Care 2022; 31:406-423. [PMID: 35579308 DOI: 10.12968/jowc.2022.31.5.406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Wound dressing adherence is an important problem that is frequently encountered in wound care, and is associated with both clinical and economic burdens. However, only a few review articles have focused on this issue. The objective of this review was to present a comprehensive discussion of wound dressing adherence, including the mechanism of dressing adherence, adverse consequences (clinical burdens and economic burdens), factors affecting adherence (dressing-, patient- and wound-related factors, and factors related to the wound care procedure), tests to assess dressing adherence (in vitro assay, in vivo assay and clinical trials), and reduction of wound adherence (modification of dressing adherence and special care in particular patients). Accordingly, this review article emphasises an awareness of dressing adherence, and is intended to be an informative source for the development of new dressings and for wound management.
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Affiliation(s)
- Apirujee Punjataewakupt
- Department of Pharmacy Practice, Faculty of Pharmaceutical Sciences and Center of Excellence in Bioactive Resources for Innovative Clinical Applications, Chulalongkorn University, Bangkok, Thailand
| | - Pornanong Aramwit
- Department of Pharmacy Practice, Faculty of Pharmaceutical Sciences and Center of Excellence in Bioactive Resources for Innovative Clinical Applications, Chulalongkorn University, Bangkok, Thailand.,The Academy of Science, The Royal Society of Thailand, Dusit, Bangkok, Thailand
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4
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Slawinski M, Khoury LR, Sharma S, Nowitzke J, Gutzman JH, Popa I. Kinetic Method of Producing Pores Inside Protein-Based Biomaterials without Compromising Their Structural Integrity. ACS Biomater Sci Eng 2022; 8:1132-1142. [PMID: 35188361 DOI: 10.1021/acsbiomaterials.1c01534] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Hydrogels made from globular proteins cross-linked covalently into a stable network are becoming an important type of biomaterial, with applications in artificial tissue design and cell culture scaffolds, and represent a promising system to study the mechanical and biochemical unfolding of proteins in crowded environments. Due to the small size of the globular protein domains, typically 2-5 nm, the primary network allows for a limited transfer of protein molecules and prevents the passing of particles and aggregates with dimensions over 100 nm. Here, we demonstrate a method to produce protein materials with micrometer-sized pores and increased permeability. Our approach relies on forming two competing networks: a covalent network made from cross-linked bovine serum albumin (BSA) proteins via a light-activated reaction and a physical network triggered by the aggregation of a polysaccharide, alginate, in the presence of Ca2+ ions. By fine-tuning the reaction times, we produce porous-protein hydrogels that retain the mechanical characteristics of their less-porous counterparts. We further describe a simple model to investigate the kinetic balance between the nucleation of alginate and cross-linking of BSA molecules and find the upper rate of the alginate aggregation reaction driving pore formation. By enabling a more significant permeability for protein-based materials without compromising their mechanical response, our method opens new vistas into studying protein-protein interactions and cell growth and designing novel affinity methods.
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Affiliation(s)
- Marina Slawinski
- Department of Physics, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, Wisconsin 53211, United States
| | - Luai R Khoury
- Department of Physics, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, Wisconsin 53211, United States.,Department of Materials Science and Engineering, Technion Israel Institute of Technology, Haifa 32000, Israel
| | - Sabita Sharma
- Department of Physics, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, Wisconsin 53211, United States
| | - Joel Nowitzke
- Department of Physics, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, Wisconsin 53211, United States
| | - Jennifer H Gutzman
- Department of Biological Sciences, University of Wisconsin-Milwaukee, 3209 N. Maryland Ave, Milwaukee, Wisconsin 53211, United States
| | - Ionel Popa
- Department of Physics, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, Wisconsin 53211, United States
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5
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Samyn P. A platform for functionalization of cellulose, chitin/chitosan, alginate with polydopamine: A review on fundamentals and technical applications. Int J Biol Macromol 2021; 178:71-93. [PMID: 33609581 DOI: 10.1016/j.ijbiomac.2021.02.091] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 02/09/2021] [Accepted: 02/12/2021] [Indexed: 12/19/2022]
Abstract
Nature provides concepts and materials with interesting functionalities to be implemented in innovative and sustainable materials. In this review, it is illustrated how the combination of biological macromolecules, i.e. polydopamine and polysaccharides (cellulose, chitin/chitosan, alginate), enables to create functional materials with controlled properties. The mussel-adhesive properties rely on the secretion of proteins having 3,4-dihydroxyphenylalanine amino acid with catechol groups. Fundamental understanding on the biological functionality and interaction mechanisms of dopamine in the mussel foot plaque is presented in parallel with the development of synthetic analogues through extraction or chemical polymer synthesis. Subsequently, modification of cellulose, chitin/chitosan or alginate and their nanoscale structures with polydopamine is discussed for various technical applications, including bio- and nanocomposites, films, filtration or medical membranes, adhesives, aerogels, or hydrogels. The presence of polydopamine stretches far beyond surface adhesive properties, as it can be used as an intermediate to provide additional performance of hydrophobicity, self-healing, antimicrobial, photocatalytic, sensoric, adsorption, biocompatibility, conductivity, coloring or mechanical properties. The dopamine-based 'green' chemistry can be extended towards generalized catechol chemistry for modification of polysaccharides with tannic acid, caffeic acid or laccase-mediated catechol functionalization. Therefore, the modification of polysaccharides with polydopamine or catechol analogues provides a general platform for sustainable material functionalization.
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Affiliation(s)
- Pieter Samyn
- Hasselt University, Institute for Materials Research, Applied and Analytical Chemistry, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium.
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6
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Strzelczyk AK, Paul TJ, Schmidt S. Quantifying Thermoswitchable Carbohydrate‐Mediated Interactions via Soft Colloidal Probe Adhesion Studies. Macromol Biosci 2020; 20:e2000186. [DOI: 10.1002/mabi.202000186] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/07/2020] [Indexed: 12/30/2022]
Affiliation(s)
- Alexander Klaus Strzelczyk
- Institute of Organic and Macromolecular Chemistry Heinrich‐Heine‐University Düsseldorf Universitatsstraße 1 Dusseldorf 40225 Germany
| | - Tanja Janine Paul
- Institute of Organic and Macromolecular Chemistry Heinrich‐Heine‐University Düsseldorf Universitatsstraße 1 Dusseldorf 40225 Germany
| | - Stephan Schmidt
- Institute of Organic and Macromolecular Chemistry Heinrich‐Heine‐University Düsseldorf Universitatsstraße 1 Dusseldorf 40225 Germany
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7
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Huang T, Kumari S, Herold H, Bargel H, Aigner TB, Heath DE, O’Brien-Simpson NM, O’Connor AJ, Scheibel T. Enhanced Antibacterial Activity of Se Nanoparticles Upon Coating with Recombinant Spider Silk Protein eADF4(κ16). Int J Nanomedicine 2020; 15:4275-4288. [PMID: 32606677 PMCID: PMC7306472 DOI: 10.2147/ijn.s255833] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 05/14/2020] [Indexed: 12/16/2022] Open
Abstract
PURPOSE Selenium nanoparticles (Se NPs) are promising antibacterial agents to tackle the growing problem of antimicrobial resistance. The aim of this study was to fabricate Se NPs with a net positive charge to enhance their antibacterial efficacy. METHODS Se NPs were coated with a positively charged protein - recombinant spider silk protein eADF4(κ16) - to give them a net positive surface charge. Their cytotoxicity and antibacterial activity were investigated, with negatively charged polyvinyl alcohol coated Se NPs as a control. Besides, these eADF4(κ16)-coated Se NPs were immobilized on the spider silk films, and the antibacterial activity of these films was investigated. RESULTS Compared to the negatively charged polyvinyl alcohol coated Se NPs, the positively charged eADF4(κ16)-coated Se NPs demonstrated a much higher bactericidal efficacy against the Gram-negative bacteria E. coli, with a minimum bactericidal concentration (MBC) approximately 50 times lower than that of negatively charged Se NPs. Cytotoxicity testing showed that the eADF4(κ16)-coated Se NPs are safe to both Balb/3T3 mouse embryo fibroblasts and HaCaT human skin keratinocytes up to 31 µg/mL, which is much higher than the MBC of these particles against E. coli (8 ± 1 µg/mL). In addition, antibacterial coatings were created by immobilising the eADF4(κ16)-coated Se NPs on positively charged spider silk films and these were shown to retain good bactericidal efficacy and overcome the issue of low particle stability in culture broth. It was found that these Se NPs needed to be released from the film surface in order to exert their antibacterial effects and this release can be regulated by the surface charge of the film, such as the change of the spider silk protein used. CONCLUSION Overall, eADF4(κ16)-coated Se NPs are promising new antibacterial agents against life-threatening bacteria.
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Affiliation(s)
- Tao Huang
- Department of Biomedical Engineering, Melbourne School of Engineering, University of Melbourne, Parkville, VIC3010, Australia
- Department for Biomaterials, Faculty of Engineering Science, University of Bayreuth, Prof. Rüdiger Bormann Str. 1, Bayreuth95447, Germany
| | - Sushma Kumari
- Department for Biomaterials, Faculty of Engineering Science, University of Bayreuth, Prof. Rüdiger Bormann Str. 1, Bayreuth95447, Germany
| | - Heike Herold
- Department for Biomaterials, Faculty of Engineering Science, University of Bayreuth, Prof. Rüdiger Bormann Str. 1, Bayreuth95447, Germany
| | - Hendrik Bargel
- Department for Biomaterials, Faculty of Engineering Science, University of Bayreuth, Prof. Rüdiger Bormann Str. 1, Bayreuth95447, Germany
| | - Tamara B Aigner
- Department for Biomaterials, Faculty of Engineering Science, University of Bayreuth, Prof. Rüdiger Bormann Str. 1, Bayreuth95447, Germany
| | - Daniel E Heath
- Department of Biomedical Engineering, Melbourne School of Engineering, University of Melbourne, Parkville, VIC3010, Australia
| | - Neil M O’Brien-Simpson
- Melbourne Dental School and the Bio21 Institute of Molecular Science and Biotechnology, The University of Melbourne, Parkville, VIC3010, Australia
| | - Andrea J O’Connor
- Department of Biomedical Engineering, Melbourne School of Engineering, University of Melbourne, Parkville, VIC3010, Australia
| | - Thomas Scheibel
- Department for Biomaterials, Faculty of Engineering Science, University of Bayreuth, Prof. Rüdiger Bormann Str. 1, Bayreuth95447, Germany
- Bavarian Polymer Institute (BPI), Bayreuth Center for Material Science and Engineering (BayMAT), Bayreuth Center for Colloids and Interfaces (BZKG), Bayreuth Center for Molecular Biosciences (BZMB), University of Bayreuth, Bayreuth95447, Germany
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8
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Mark A, Helfricht N, Rauh A, Karg M, Papastavrou G. The Next Generation of Colloidal Probes: A Universal Approach for Soft and Ultra-Small Particles. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1902976. [PMID: 31544313 DOI: 10.1002/smll.201902976] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 08/18/2019] [Indexed: 06/10/2023]
Abstract
The colloidal probe technique, which is based on the atomic force microscope, revolutionizes direct force measurements in many fields, such as interface science or biomechanics. It allows for the first time to determine interaction forces on the single particle or cell level. However, for many applications, important "blind spots" remain, namely, the possibility to probe interaction potentials for nanoparticles or complex colloids with a soft outer shell. Definitely, these are colloidal systems that are currently of major industrial importance and interest from theory. The here-presented novel approach allows for overcome the aforementioned limitations. Its applicability has been demonstrated for 300 nm sized carboxylate-modified latex particles as well as sub-micron core-shell particles with a soft poly-N-isopropylacrylamide hydrogel shell and a rigid silica core. For the latter, which until now cannot be studied by the colloidal probe technique, determined is the temperature dependency of electrosteric and adhesion forces has been determined on the single particle level.
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Affiliation(s)
- Andreas Mark
- Physical Chemistry II, University of Bayreuth, Universitätsstr. 30, 95440, Bayreuth, Germany
| | - Nicolas Helfricht
- Physical Chemistry II, University of Bayreuth, Universitätsstr. 30, 95440, Bayreuth, Germany
- Bavarian Polymer Institute, University of Bayreuth, Universitätsstr. 30, 95440, Bayreuth, Germany
| | - Astrid Rauh
- Department of Physical Chemistry I, Heinrich-Heine-University, Universitätsstr. 1, 40204, Düsseldorf, Germany
| | - Matthias Karg
- Department of Physical Chemistry I, Heinrich-Heine-University, Universitätsstr. 1, 40204, Düsseldorf, Germany
| | - Georg Papastavrou
- Physical Chemistry II, University of Bayreuth, Universitätsstr. 30, 95440, Bayreuth, Germany
- Bavarian Polymer Institute, University of Bayreuth, Universitätsstr. 30, 95440, Bayreuth, Germany
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9
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Charging, aggregation, and aggregate strength of humic substances in the presence of cationic surfactants: Effects of humic substances hydrophobicity and surfactant tail length. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.05.071] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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10
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Hakim A, Suzuki T, Kobayashi M. Strength of Humic Acid Aggregates: Effects of Divalent Cations and Solution pH. ACS OMEGA 2019; 4:8559-8567. [PMID: 31459946 PMCID: PMC6648436 DOI: 10.1021/acsomega.9b00124] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 05/07/2019] [Indexed: 05/25/2023]
Abstract
Aggregation-dispersion, charging, and aggregate strength of Leonardite humic acid (LHA) were investigated in CaCl2 and MgCl2 solutions as a function of pH and ionic strength (I). The strength or the withstanding force of aggregates of humic substances (HSs) against breakage is important because this force influences the transport and distribution of pollutants and nutrients along with HSs through the change in the size of HS aggregates as a transport unit. We observed the dominancy of aggregation of LHA at high pH than at low pH in every case of CaCl2 and MgCl2 solutions. This observation suggests the higher binding efficiency of these divalent ions at high pH, though there was no obvious relation with electrophoretic mobility and aggregation of LHA. Further, we first revealed the numerical value of the strength of HS aggregates by using a simple experimental setup of aggregate breakup under laminar converging flow through a capillary tube. The obtained values of the strength of LHA aggregates were higher in the presence of CaCl2 solution than MgCl2 solution, and the strength increased with pH. The highest strengths of LHA aggregates in 30 mM (I) CaCl2 and MgCl2 solutions were around 5.8 and 2.4 nN, respectively, at pH around 9.
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Affiliation(s)
- Azizul Hakim
- Graduate
School of Life and Environmental Sciences and Faculty of Life and Environmental
Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8572, Ibaraki, Japan
- Department
of Soil Science, University of Chittagong, Chittagong 4331, Bangladesh
| | - Tomoharu Suzuki
- Graduate
School of Life and Environmental Sciences and Faculty of Life and Environmental
Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8572, Ibaraki, Japan
| | - Motoyoshi Kobayashi
- Graduate
School of Life and Environmental Sciences and Faculty of Life and Environmental
Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8572, Ibaraki, Japan
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11
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Chui CY, Bonilla-Brunner A, Seifert J, Contera S, Ye H. Atomic force microscopy-indentation demonstrates that alginate beads are mechanically stable under cell culture conditions. J Mech Behav Biomed Mater 2019; 93:61-69. [PMID: 30772703 DOI: 10.1016/j.jmbbm.2019.01.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 12/18/2018] [Accepted: 01/22/2019] [Indexed: 12/18/2022]
Abstract
Alginate microbeads are extensively used in tissue engineering as microcarriers and cell encapsulation vessels. In this study, we used atomic force microscopy (AFM) based indentation using 20 µm colloidal probes to assess the local reduced elastic modulus (E * ) using a novel method to detect the contact point based on the principle of virtual work, to measure microbead mechanical stability under cell culture conditions for 2 weeks. The bead diameter and swelling were assessed in parallel. Alginate beads swelled up to 150% of their original diameter following addition of cell culture media. The diameter eventually stabilized from day 2 onwards. This behaviour was mirrored in E * where a significant decrease was observed at the start of the culture period before stabilization was observed at ~ 2.1 kPa. Furthermore, the mechanical properties of freeze dried alginate beads after re-swelling them in culture media were measured. These beads displayed vastly different structural and mechanical properties compared those that did not go through the freeze drying process, with around 125% swelling and a significantly higher E * at values over 3 kPa.
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Affiliation(s)
- Chih-Yao Chui
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Old Road Campus off Roosevelt Drive, OX3 7DQ, United Kingdom
| | - Andrea Bonilla-Brunner
- Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, OX1 3PU, United Kingdom
| | - Jacob Seifert
- Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, OX1 3PU, United Kingdom; Department of Plant Sciences, University of Oxford, South Parks Road, OX1 3RB, United Kingdom
| | - Sonia Contera
- Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, OX1 3PU, United Kingdom.
| | - Hua Ye
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Old Road Campus off Roosevelt Drive, OX3 7DQ, United Kingdom.
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12
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Jacobi F, Camaleño de la Calle A, Boden S, Grafmüller A, Hartmann L, Schmidt S. Multivalent Binding of Precision Glycooligomers on Soft Glycocalyx Mimicking Hydrogels. Biomacromolecules 2018; 19:3479-3488. [DOI: 10.1021/acs.biomac.8b00790] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fawad Jacobi
- Institute of Organic and Macromolecular Chemistry, Heinrich-Heine-University Düsseldorf, Universitatsstraße 1, 40225 Dusseldorf, Germany
| | - Alberto Camaleño de la Calle
- Institute of Organic and Macromolecular Chemistry, Heinrich-Heine-University Düsseldorf, Universitatsstraße 1, 40225 Dusseldorf, Germany
| | - Sophia Boden
- Institute of Organic and Macromolecular Chemistry, Heinrich-Heine-University Düsseldorf, Universitatsstraße 1, 40225 Dusseldorf, Germany
| | - Andrea Grafmüller
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14478 Potsdam, Germany
| | - Laura Hartmann
- Institute of Organic and Macromolecular Chemistry, Heinrich-Heine-University Düsseldorf, Universitatsstraße 1, 40225 Dusseldorf, Germany
| | - Stephan Schmidt
- Institute of Organic and Macromolecular Chemistry, Heinrich-Heine-University Düsseldorf, Universitatsstraße 1, 40225 Dusseldorf, Germany
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13
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Hydrogel Microparticles as Sensors for Specific Adhesion: Case Studies on Antibody Detection and Soil Release Polymers. Gels 2017; 3:gels3030031. [PMID: 30920527 PMCID: PMC6318626 DOI: 10.3390/gels3030031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 08/01/2017] [Accepted: 08/03/2017] [Indexed: 01/28/2023] Open
Abstract
Adhesive processes in aqueous media play a crucial role in nature and are important for many technological processes. However, direct quantification of adhesion still requires expensive instrumentation while their sample throughput is rather small. Here we present a fast, and easily applicable method on quantifying adhesion energy in water based on interferometric measurement of polymer microgel contact areas with functionalized glass slides and evaluation via the Johnson–Kendall–Roberts (JKR) model. The advantage of the method is that the microgel matrix can be easily adapted to reconstruct various biological or technological adhesion processes. Here we study the suitability of the new adhesion method with two relevant examples: (1) antibody detection and (2) soil release polymers. The measurement of adhesion energy provides direct insights on the presence of antibodies showing that the method can be generally used for biomolecule detection. As a relevant example of adhesion in technology, the antiadhesive properties of soil release polymers used in today’s laundry products are investigated. Here the measurement of adhesion energy provides direct insights into the relation between polymer composition and soil release activity. Overall, the work shows that polymer hydrogel particles can be used as versatile adhesion sensors to investigate a broad range of adhesion processes in aqueous media.
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14
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Li M, Li H, Li X, Zhu H, Xu Z, Liu L, Ma J, Zhang M. A Bioinspired Alginate-Gum Arabic Hydrogel with Micro-/Nanoscale Structures for Controlled Drug Release in Chronic Wound Healing. ACS APPLIED MATERIALS & INTERFACES 2017; 9:22160-22175. [PMID: 28640580 PMCID: PMC5979260 DOI: 10.1021/acsami.7b04428] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Biopolymeric hydrogels have drawn increasing research interest in biomaterials due to their tunable physical and chemical properties for both creating bioactive cellular microenvironment and serving as sustainable therapeutic reagents. Inspired by a naturally occurring hydrogel secreted from the carnivorous Sundew plant for trapping insects, here we have developed a bioinspired hydrogel to deliver mitsugumin 53 (MG53), an important protein in cell membrane repair, for chronic wound healing. Both chemical compositions and micro-/nanomorphological properties inherent from the natural Sundew hydrogel were mimicked using sodium alginate and gum arabic with calcium ion-mediated cross-linking. On the basis of atomic force microscopy (AFM) force measurements, an optimal sticky hydrogel scaffold was obtained through orthogonal experimental design. Imaging and mechanical analysis showed the distinct correlation between structural morphology, adhesion characteristics, and mechanical properties of the Sundew-inspired hydrogel. Combined characterization and biochemistry techniques were utilized to uncover the underlying molecular composition involved in the interactions between hydrogel and protein. In vitro drug release experiments confirmed that the Sundew-inspired hydrogel had a biphasic-kinetics release, which can facilitate both fast delivery of MG53 for improving the reepithelization process of the wounds and sustained release of the protein for treating chronic wounds. In vivo experiments showed that the Sundew-inspired hydrogel encapsulating with rhMG53 could facilitate dermal wound healing in mouse model. Together, these studies confirmed that the Sundew-inspired hydrogel has both tunable micro-/nanostructures and physicochemical properties, which enable it as a delivery vehicle for chronic wounding healing. The research may provide a new way to develop biocompatible and tunable biomaterials for sustainable drug release to meet the needs of biological activities.
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Affiliation(s)
- Mi Li
- Department of Biomedical Engineering, College of Engineering, Columbus, Ohio 43210, United States
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
| | - Haichang Li
- Dorothy M. Davis Heart & Lung Research Institute, Wexner Medical Center, Columbus, Ohio 43210, United States
- Department of Surgery, The Ohio State University, Columbus, Ohio 43210, United States
| | - Xiangguang Li
- Dorothy M. Davis Heart & Lung Research Institute, Wexner Medical Center, Columbus, Ohio 43210, United States
- Department of Surgery, The Ohio State University, Columbus, Ohio 43210, United States
- College of Animal Science, South China Agricultural University, Guangzhou 510642, China
| | - Hua Zhu
- Dorothy M. Davis Heart & Lung Research Institute, Wexner Medical Center, Columbus, Ohio 43210, United States
- Department of Surgery, The Ohio State University, Columbus, Ohio 43210, United States
| | - Zihui Xu
- Department of Biomedical Engineering, College of Engineering, Columbus, Ohio 43210, United States
| | - Lianqing Liu
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
| | - Jianjie Ma
- Dorothy M. Davis Heart & Lung Research Institute, Wexner Medical Center, Columbus, Ohio 43210, United States
- Department of Surgery, The Ohio State University, Columbus, Ohio 43210, United States
| | - Mingjun Zhang
- Department of Biomedical Engineering, College of Engineering, Columbus, Ohio 43210, United States
- Dorothy M. Davis Heart & Lung Research Institute, Wexner Medical Center, Columbus, Ohio 43210, United States
- Interdisciplinary Biophysics Graduate Program, Columbus, Ohio 43210, United States
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