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Rodríguez-López R, Wang Z, Oda H, Erdi M, Kofinas P, Fytas G, Scarcelli G. Network Viscoelasticity from Brillouin Spectroscopy. Biomacromolecules 2024; 25:955-963. [PMID: 38156622 PMCID: PMC10865340 DOI: 10.1021/acs.biomac.3c01073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 12/02/2023] [Accepted: 12/04/2023] [Indexed: 01/03/2024]
Abstract
Even though the physical nature of shear and longitudinal moduli are different, empirical correlations between them have been reported in several biological systems. This correlation is of fundamental interest and immense practical value in biomedicine due to the importance of the shear modulus and the possibility to map the longitudinal modulus at high-resolution with all-optical spectroscopy. We investigate the origin of such a correlation in hydrogels. We hypothesize that both moduli are influenced in the same direction by underlying physicochemical properties, which leads to the observed material-dependent correlation. Matching theoretical models with experimental data, we quantify the scenarios in which the correlation holds. For polymerized hydrogels, a correlation was found across different hydrogels through a common dependence on the effective polymer volume fraction. For hydrogels swollen to equilibrium, the correlation is valid only within a given hydrogel system, as the moduli are found to have different scalings on the swelling ratio. The observed correlation allows one to extract one modulus from another in relevant scenarios.
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Affiliation(s)
- Raymundo Rodríguez-López
- Fischell
Department of Bioengineering, University
of Maryland, College
Park, Maryland 20742, United States
| | - Zuyuan Wang
- School
of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
| | - Haruka Oda
- School
of Information Science and Technology, The
University of Tokyo, Tokyo 113-8656,Japan
| | - Metecan Erdi
- Department
of Chemical and Biomolecular Engineering, University of Maryland, College
Park, Maryland 20742, United States
| | - Peter Kofinas
- Department
of Chemical and Biomolecular Engineering, University of Maryland, College
Park, Maryland 20742, United States
| | - George Fytas
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Institute
of Electronic Structure and Laser, FO.R.T.H, N. Plastira 10, Heraklion, 70013, Greece
| | - Giuliano Scarcelli
- Fischell
Department of Bioengineering, University
of Maryland, College
Park, Maryland 20742, United States
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2
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Erdi M, Sandler A, Kofinas P. Polymer nanomaterials for use as adjuvant surgical tools. Wiley Interdiscip Rev Nanomed Nanobiotechnol 2023; 15:e1889. [PMID: 37044114 PMCID: PMC10524211 DOI: 10.1002/wnan.1889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 03/03/2023] [Accepted: 03/17/2023] [Indexed: 04/14/2023]
Abstract
Materials employed in the treatment of conditions encountered in surgical and clinical practice frequently face barriers in translation to application. Shortcomings can be generalized through their reduced mechanical stability, difficulty in handling, and inability to conform or adhere to complex tissue surfaces. To overcome an amalgam of challenges, research has sought the utilization of polymer-derived nanomaterials deposited in various fashions and formulations to improve the application and outcomes of surgical and clinical interventions. Clinically prevalent applications include topical wound dressings, tissue adhesives, surgical sealants, hemostats, and adhesion barriers, all of which have displayed the potential to act as superior alternatives to current materials used in surgical procedures. In this review, emphasis will be placed not only on applications, but also on various design strategies employed in fabrication. This review is designed to provide a broad and thought-provoking understanding of nanomaterials as adjuvant tools for the assisted treatment of pathologies prevalent in surgery. This article is categorized under: Implantable Materials and Surgical Technologies > Nanomaterials and Implants Implantable Materials and Surgical Technologies > Nanoscale Tools and Techniques in Surgery.
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Affiliation(s)
- Metecan Erdi
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland, USA
| | - Anthony Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, Washington, DC, USA
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland, USA
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3
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Ludwig KB, Correll-Brown R, Freidlin M, Garaga MN, Bhattacharyya S, Gonzales PM, Cresce AV, Greenbaum S, Wang C, Kofinas P. Highly Conductive Polyacrylonitrile-based Hybrid Aqueous/Ionic Liquid Solid Polymer Electrolytes with Tunable Passivation for Li-ion Batteries. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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4
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Sarker S, Colton A, Wen Z, Xu X, Erdi M, Jones A, Kofinas P, Tubaldi E, Walczak P, Janowski M, Liang Y, Sochol RD. 3D-Printed Microinjection Needle Arrays via a Hybrid DLP-Direct Laser Writing Strategy. Adv Mater Technol 2023; 8:2201641. [PMID: 37064271 PMCID: PMC10104452 DOI: 10.1002/admt.202201641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Indexed: 06/19/2023]
Abstract
Microinjection protocols are ubiquitous throughout biomedical fields, with hollow microneedle arrays (MNAs) offering distinctive benefits in both research and clinical settings. Unfortunately, manufacturing-associated barriers remain a critical impediment to emerging applications that demand high-density arrays of hollow, high-aspect-ratio microneedles. To address such challenges, here, a hybrid additive manufacturing approach that combines digital light processing (DLP) 3D printing with "ex situ direct laser writing (esDLW)" is presented to enable new classes of MNAs for fluidic microinjections. Experimental results for esDLW-based 3D printing of arrays of high-aspect-ratio microneedles-with 30 μm inner diameters, 50 μm outer diameters, and 550 μm heights, and arrayed with 100 μm needle-to-needle spacing-directly onto DLP-printed capillaries reveal uncompromised fluidic integrity at the MNA-capillary interface during microfluidic cyclic burst-pressure testing for input pressures in excess of 250 kPa (n = 100 cycles). Ex vivo experiments perform using excised mouse brains reveal that the MNAs not only physically withstand penetration into and retraction from brain tissue but also yield effective and distributed microinjection of surrogate fluids and nanoparticle suspensions directly into the brains. In combination, the results suggest that the presented strategy for fabricating high-aspect-ratio, high-density, hollow MNAs could hold unique promise for biomedical microinjection applications.
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Affiliation(s)
- Sunandita Sarker
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA; Maryland Robotics Center, University of Maryland, College Park, MD 20742, USA; Institute for Systems Research, University of Maryland, College Park, MD 20742, USA
| | - Adira Colton
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA; Maryland Robotics Center, University of Maryland, College Park, MD 20742, USA; Institute for Systems Research, University of Maryland, College Park, MD 20742, USA
| | - Ziteng Wen
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
| | - Xin Xu
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
| | - Metecan Erdi
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA
| | - Anthony Jones
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA; Maryland Robotics Center, University of Maryland, College Park, MD 20742, USA; Institute for Systems Research, University of Maryland, College Park, MD 20742, USA
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA
| | - Eleonora Tubaldi
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA; Maryland Robotics Center, University of Maryland, College Park, MD 20742, USA; Institute for Systems Research, University of Maryland, College Park, MD 20742, USA
| | - Piotr Walczak
- Program in Image Guided Neurointerventions, Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Miroslaw Janowski
- Program in Image Guided Neurointerventions, Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Yajie Liang
- Program in Image Guided Neurointerventions, Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Ryan D Sochol
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA; Maryland Robotics Center, University of Maryland, College Park, MD 20742, USA; Institute for Systems Research, University of Maryland, College Park, MD 20742, USA; Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA; Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, USA
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Erdi M, Saruwatari MS, Rozyyev S, Acha C, Ayyub OB, Sandler AD, Kofinas P. Controlled Release of a Therapeutic Peptide in Sprayable Surgical Sealant for Prevention of Postoperative Abdominal Adhesions. ACS Appl Mater Interfaces 2023:10.1021/acsami.3c00283. [PMID: 36884271 PMCID: PMC10485170 DOI: 10.1021/acsami.3c00283] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Formation of asymmetric, rigid scar tissue known as surgical adhesions is caused by traumatic disruption of mesothelial-lined surfaces in surgery. A widely adopted prophylactic barrier material (Seprafilm) for the treatment of intra-abdominal adhesions is applied operatively as a pre-dried hydrogel sheet but has reduced translational efficacy due its brittle mechanical properties. Topically administered peritoneal dialysate (Icodextrin) and anti-inflammatory drugs have failed to prevent adhesions due to an uncontrolled release profile. Hence, inclusion of a targeted therapeutic into a solid barrier host matrix with improved mechanical properties could provide dual utility in adhesion prevention and as a surgical sealant. Spray deposition of poly(lactide-co-caprolactone) (PLCL) polymer fibers through solution blow spinning has yielded a tissue-adherent barrier material with previously reported adhesion prevention efficacy due to a surface erosion mechanism that inhibits deposition of inflamed tissue. However, such an approach uniquely presents an avenue for controlled therapeutic release through mechanisms of diffusion and degradation. Such a rate is kinetically tuned via facile blending of "high" molecular weight (HMW) and "low" molecular weight (LMW) PLCL with slow and fast biodegradation rates, respectively. Here, we explore viscoelastic blends of HMW PLCL (70% w/v) and LMW PLCL (30% w/v) as a host matrix for anti-inflammatory drug delivery. In this work, COG133, an apolipoprotein E (ApoE) mimetic peptide with potent anti-inflammatory properties was selected and tested. In vitro studies with PLCL blends presented low (∼30%) and high (∼80%) percent release profiles over a 14-day period based on the nominal molecular weight of the HMW PLCL component. Two independent mouse models of cecal ligation and cecal anastomosis significantly reduced adhesion severity versus Seprafilm, COG133 liquid suspension, and no treatment control. The synergy of physical and chemical methods in a barrier material with proven preclinical studies highlights the value of COG133-loaded PLCL fiber mats in effectively dampening the formation of severe abdominal adhesions.
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Affiliation(s)
- Metecan Erdi
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Michele S Saruwatari
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, Washington, District of Columbia 20010, United States
| | - Selim Rozyyev
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, Washington, District of Columbia 20010, United States
| | - Christopher Acha
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Omar B Ayyub
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Anthony D Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, Washington, District of Columbia 20010, United States
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States
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Ramirez PD, Lee C, Fedderwitz R, Clavijo AR, Barbosa DPP, Julliot M, Vaz-Ramos J, Begin D, Le Calvé S, Zaloszyc A, Choquet P, Soler MAG, Mertz D, Kofinas P, Piao Y, Begin-Colin S. Phosphate Capture Enhancement Using Designed Iron Oxide-Based Nanostructures. Nanomaterials (Basel) 2023; 13:587. [PMID: 36770547 PMCID: PMC9921849 DOI: 10.3390/nano13030587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/20/2023] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
Phosphates in high concentrations are harmful pollutants for the environment, and new and cheap solutions are currently needed for phosphate removal from polluted liquid media. Iron oxide nanoparticles show a promising capacity for removing phosphates from polluted media and can be easily separated from polluted media under an external magnetic field. However, they have to display a high surface area allowing high removal pollutant capacity while preserving their magnetic properties. In that context, the reproducible synthesis of magnetic iron oxide raspberry-shaped nanostructures (RSNs) by a modified polyol solvothermal method has been optimized, and the conditions to dope the latter with cobalt, zinc, and aluminum to improve the phosphate adsorption have been determined. These RSNs consist of oriented aggregates of iron oxide nanocrystals, providing a very high saturation magnetization and a superparamagnetic behavior that favor colloidal stability. Finally, the adsorption of phosphates as a function of pH, time, and phosphate concentration has been studied. The undoped and especially aluminum-doped RSNs were demonstrated to be very effective phosphate adsorbents, and they can be extracted from the media by applying a magnet.
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Affiliation(s)
- Paula Duenas Ramirez
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
| | - Chaedong Lee
- Graduate School of Convergence Science and Technology, Seoul National University, 145 Gwanggyo-ro, Yeongtong-gu, Suwon-Si 16229, Gyeonggi-do, Republic of Korea
| | - Rebecca Fedderwitz
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, MD 20740, USA
| | | | | | - Maxime Julliot
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
| | - Joana Vaz-Ramos
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR-7515 CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Dominique Begin
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR-7515 CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Stéphane Le Calvé
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR-7515 CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Ariane Zaloszyc
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR-7515 CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France
| | - Philippe Choquet
- Laboratoire des Sciences de l’Ingénieur, de l’Informatique et de l’Imagerie (ICube)—CNRS/University of Strasbourg, UMR 7357 Preclinical Imaging Lab, Imaging Dpt, Hôpitaux Universitaires de Strasbourg, 67098 Strasbourg, France
| | - Maria A. G. Soler
- Institute of Physics, University of Brasilia, Brasilia 70910900, Brazil
| | - Damien Mertz
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, MD 20740, USA
| | - Yuanzhe Piao
- Graduate School of Convergence Science and Technology, Seoul National University, 145 Gwanggyo-ro, Yeongtong-gu, Suwon-Si 16229, Gyeonggi-do, Republic of Korea
- Advanced Institutes of Convergence Technology, 145 Gwanggyo-ro, Yeongtong-gu, Suwon-si 16229, Gyeonggi-do, Republic of Korea
| | - Sylvie Begin-Colin
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France
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Erdi M, Rozyyev S, Balabhadrapatruni M, Saruwatari MS, Daristotle JL, Ayyub OB, Sandler AD, Kofinas P. Sprayable tissue adhesive with biodegradation tuned for prevention of postoperative abdominal adhesions. Bioeng Transl Med 2022; 8:e10335. [PMID: 36684071 PMCID: PMC9842025 DOI: 10.1002/btm2.10335] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/20/2022] [Accepted: 04/23/2022] [Indexed: 01/25/2023] Open
Abstract
Adhesions are dense, fibrous bridges that adjoin tissue surfaces due to uncontrolled inflammation following postoperative mesothelial injury. A widely used adhesion barrier material in Seprafilm often fails to prevent transverse scar tissue deposition because of its poor mechanical properties, rapid degradation profile, and difficulty in precise application. Solution blow spinning (SBS), a polymer fiber deposition technique, allows for the placement of in situ tissue-conforming and tissue-adherent scaffolds with exceptional mechanical properties. While biodegradable polymers such as poly(lactic-co-glycolic acid) (PLGA) have desirable strength, they exhibit bulk biodegradation rates and inflammatory profiles that limit their use as adhesion barriers and result in poor tissue adhesion. Here, viscoelastic poly(lactide-co-caprolactone) (PLCL) is used for its pertinent biodegradation mechanism. Because it degrades via surface erosion, spray deposited PLCL fibers can dissolve new connections formed by inflamed tissue, allowing them to function as an effective, durable, and easy-to-apply adhesion barrier. Degradation kinetics are tuned to match adhesion formation through the design of PLCL blends comprised of highly adhesive "low"-molecular weight (LMW) constituents in a mechanically robust "high"-molecular weight (HMW) matrix. In vitro studies demonstrate that blending LMW PLCL (30% w/v) with HMW PLCL (70% w/v) yields an anti-fibrotic yet tissue-adhesive polymer sealant with a 14-day erosion rate countering adhesion formation. PLCL blends additionally exhibit improved wet tissue adhesion strength (~10 kPa) over a 14-day period versus previously explored biodegradable polymer compositions, such as PLGA. In a mouse cecal ligation model, select PLCL blends significantly reduce abdominal adhesions severity versus no treatment and Seprafilm-treated controls.
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Affiliation(s)
- Metecan Erdi
- Department of Chemical and Biomolecular EngineeringUniversity of MarylandCollege ParkMarylandUSA
| | - Selim Rozyyev
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical CareChildren's National Medical CenterWashingtonDistrict of ColumbiaUSA
| | | | - Michele S. Saruwatari
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical CareChildren's National Medical CenterWashingtonDistrict of ColumbiaUSA
| | - John L. Daristotle
- David H. Koch Institute for Integrative Cancer ResearchMassachusetts Institute of TechnologyCambridgeMassachusettsUSA
| | - Omar B. Ayyub
- Department of Chemical and Biomolecular EngineeringUniversity of MarylandCollege ParkMarylandUSA
| | - Anthony D. Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical CareChildren's National Medical CenterWashingtonDistrict of ColumbiaUSA
| | - Peter Kofinas
- Department of Chemical and Biomolecular EngineeringUniversity of MarylandCollege ParkMarylandUSA
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Nikfarjam S, Woehl TJ, Anisimov M, Kofinas P, Erdi M, Gibbons R. Chemically fueled assembly of protein hydrogels driven by a redox cycle. Biophys J 2022. [DOI: 10.1016/j.bpj.2021.11.1962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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9
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Carney BC, Oliver MA, Erdi M, Kirkpatrick LD, Tranchina SP, Rozyyev S, Keyloun JW, Saruwatari MS, Daristotle JL, Moffatt LT, Kofinas P, Sandler AD, Shupp JW. Evaluation of Healing Outcomes Combining A Novel Polymer Formulation with Autologous Skin Cell Suspension to Treat Deep Partial and Full Thickness Wounds in a Porcine Model; A Pilot Study. Burns 2022; 48:1950-1965. [DOI: 10.1016/j.burns.2022.01.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 12/29/2021] [Accepted: 01/16/2022] [Indexed: 11/02/2022]
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Daristotle JL, Erdi M, Lau LW, Zaki ST, Srinivasan P, Balabhadrapatruni M, Ayyub OB, Sandler AD, Kofinas P. Biodegradable, Tissue Adhesive Polyester Blends for Safe, Complete Wound Healing. ACS Biomater Sci Eng 2021; 7:3908-3916. [PMID: 34323468 PMCID: PMC8594560 DOI: 10.1021/acsbiomaterials.1c00865] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Pressure-sensitive adhesives typically used for bandages are nonbiodegradable, inhibiting healing, and may cause an allergic reaction. Here, we investigated the effect of biodegradable copolymers with promising thermomechanical properties on wound healing for their eventual use as biodegradable, biocompatible adhesives. Blends of low molecular weight (LMW) and high molecular weight (HMW) poly(lactide-co-caprolactone) (PLCL) are investigated as tissue adhesives in comparison to a clinical control. Wounds treated with PLCL blend adhesives heal completely with similar vascularization, scarring, and inflammation indicators, yet require fewer dressing changes due to integration of the PLCL adhesive into the wound. A blend of LMW and HMW PLCL produces an adhesive material with significantly higher adhesive strength than either neat polymer. Wound adhesion is comparable to a polyurethane bandage, utilizing conventional nonbiodegradable adhesives designed for extremely strong adhesion.
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Affiliation(s)
- John L Daristotle
- Fischell Department of Bioengineering, University of Maryland, 3102 A. James Clark Hall, 8278 Paint Branch Dr., College Park, Maryland 20742, United States
| | - Metecan Erdi
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, Maryland 20742, United States
| | - Lung W Lau
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, 111 Michigan Avenue NW, Washington, District of Columbia 20010, United States
| | - Shadden T Zaki
- Department of Materials Science and Engineering, University of Maryland, 4418 Stadium Dr., College Park, Maryland 20742, United States
| | - Priya Srinivasan
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, 111 Michigan Avenue NW, Washington, District of Columbia 20010, United States
| | - Manogna Balabhadrapatruni
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, Maryland 20742, United States
| | - Omar B Ayyub
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, Maryland 20742, United States
| | - Anthony D Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, 111 Michigan Avenue NW, Washington, District of Columbia 20010, United States
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, Maryland 20742, United States
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Widstrom MD, Borodin O, Ludwig KB, Matthews JE, Bhattacharyya S, Garaga M, V. Cresce A, Jarry A, Erdi M, Wang C, Greenbaum S, Kofinas P. Water Domain Enabled Transport in Polymer Electrolytes for Lithium-Ion Batteries. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c01960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew D. Widstrom
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20740, United States
| | - Oleg Borodin
- Energy Storage Branch, Sensor and Electron Devices Directorate, Combat Capabilities Development Command U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States
| | - Kyle B. Ludwig
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20740, United States
| | - Jesse E. Matthews
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20740, United States
| | - Sahana Bhattacharyya
- Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, New York 10065, United States
| | - Mounesha Garaga
- Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, New York 10065, United States
| | - Arthur V. Cresce
- Energy Storage Branch, Sensor and Electron Devices Directorate, Combat Capabilities Development Command U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States
| | - Angelique Jarry
- Department of Materials Science and Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20740, United States
| | - Metecan Erdi
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20740, United States
| | - Chunsheng Wang
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20740, United States
| | - Steven Greenbaum
- Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, New York 10065, United States
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20740, United States
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Widstrom MD, Ludwig KB, Matthews JE, Jarry A, Erdi M, Cresce AV, Rubloff G, Kofinas P. Enabling high performance all-solid-state lithium metal batteries using solid polymer electrolytes plasticized with ionic liquid. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136156] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Daristotle JL, Zaki ST, Lau LW, Ayyub OB, Djouini M, Srinivasan P, Erdi M, Sandler AD, Kofinas P. Pressure-Sensitive Tissue Adhesion and Biodegradation of Viscoelastic Polymer Blends. ACS Appl Mater Interfaces 2020; 12:16050-16057. [PMID: 32191429 PMCID: PMC7271901 DOI: 10.1021/acsami.0c00497] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Viscoelastic blends of biodegradable polyesters with low and high molecular weight distributions have remarkably strong adhesion (significantly greater than 1 N/cm2) to soft, wet tissue. Those that transition from viscous flow to elastic, solidlike behavior at approximately 1 Hz demonstrate pressure-sensitivity yet also have sufficient elasticity for durable bonding to soft, wet tissue. The pressure-sensitive tissue adhesive (PSTA) blends produce increasingly stronger pull-apart adhesion in response to compressive pressure application, from 10 to 300 s. By incorporating a stiffer high molecular weight component, the PSTA exhibits dramatically improved burst pressure (greater than 100 kPa) when used as a tissue sealant. The PSTA's biodegradation mechanism can be switched from erosion (occurring primarily over the first 10 days) to bulk chemical degradation (and minimal erosion) depending on the chemistry of the high molecular weight component. Interestingly, fibrosis toward the PSTA is reduced when fast-occurring erosion is the dominant biodegradation mechanism.
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Affiliation(s)
- John L. Daristotle
- Fischell Department of Bioengineering, University of Maryland, Room 3102 A. James Clark Hall, 8278 Paint Branch Drive, College Park, Maryland 20742, United States
| | - Shadden T. Zaki
- Department of Materials Science and Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20742, United States
| | - Lung W. Lau
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, 111 Michigan Avenue NW, Washington, D.C. 20010, United States
| | - Omar B. Ayyub
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20742, United States
| | - Massi Djouini
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20742, United States
| | - Priya Srinivasan
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, 111 Michigan Avenue NW, Washington, D.C. 20010, United States
| | - Metecan Erdi
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20742, United States
| | - Anthony D. Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, 111 Michigan Avenue NW, Washington, D.C. 20010, United States
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Drive, College Park, Maryland 20742, United States
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Torres L, Margaronis A, Bellato Meinhardt BM, Granzow L, Ayyub OB, Kofinas P. Rapid and Tunable Method To Fabricate Angle-Independent and Transferable Structurally Colored Films. Langmuir 2020; 36:1252-1257. [PMID: 31961697 DOI: 10.1021/acs.langmuir.9b03516] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The assembly of monodisperse particles into colloidal arrays that diffract visible light through constructive interference is of considerable interest due to their resilience against color fading. In particular, noniridescent structurally colored materials are promising as a means of coloration for paints, inks, cosmetics, and displays because their color is angle independent. A rapid and tunable assembly method for producing noniridescent structurally colored colloidal-based materials that are pliable after fabrication is described. Structurally colored particle arrays were fabricated by centrifuging highly charged silica particles suspended in deionized water. By tuning the particle diameter, the colors displayed by the arrays spanned the visible spectrum while retaining angle-independent structural color. The color of centrifuged colloids of a single particle diameter was precisely controlled within 50 nm by modulating the particle concentration. The peak wavelength diffracted by the material was further tuned by altering the centrifugal rate and assembly time. Centrifugation assembly of particles in a polymer solution also produces noniridescent colloidal films, and the control of their color is reported. Together, these results offer design considerations for the centrifugation-based assembly of colloidal films with tunable structural color that are transferable after fabrication and are angle independent.
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Affiliation(s)
- Leopoldo Torres
- Fischell Department of Bioengineering , University of Maryland , Room 3102 A, James Clark Hall, 8278 Paint Branch Drive , College Park , Maryland 20742 , United States
| | - Artemis Margaronis
- Department of Chemical and Biomolecular Engineering , University of Maryland , 4418 Stadium Drive , College Park , Maryland 20742 , United States
| | - Bianca M Bellato Meinhardt
- Department of Chemical and Biomolecular Engineering , University of Maryland , 4418 Stadium Drive , College Park , Maryland 20742 , United States
| | - Lily Granzow
- Department of Chemical and Biomolecular Engineering , University of Maryland , 4418 Stadium Drive , College Park , Maryland 20742 , United States
| | - Omar B Ayyub
- Department of Chemical and Biomolecular Engineering , University of Maryland , 4418 Stadium Drive , College Park , Maryland 20742 , United States
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering , University of Maryland , 4418 Stadium Drive , College Park , Maryland 20742 , United States
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15
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Van Belleghem S, Torres L, Santoro M, Mahadik B, Wolfand A, Kofinas P, Fisher JP. Hybrid 3D Printing of Synthetic and Cell-Laden Bioinks for Shape Retaining Soft Tissue Grafts. Adv Funct Mater 2020; 30:1907145. [PMID: 33041744 PMCID: PMC7546434 DOI: 10.1002/adfm.201907145] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Indexed: 05/24/2023]
Abstract
Despite recent advances in clinical procedures, the repair of soft tissue remains a reconstructive challenge. Current technologies such as synthetic implants and dermal flap autografting result in inefficient shape retention and unpredictable aesthetic outcomes. 3D printing, however, can be leveraged to produce superior soft tissue grafts that allow enhanced host integration and volume retention. Here, a novel dual bioink 3D printing strategy is presented that utilizes synthetic and natural materials to create stable, biomimetic soft tissue constructs. A double network ink composed of covalently crosslinked poly(ethylene) glycol and ionically crosslinked alginate acts as a physical support network that promotes cell growth and enables long-tersm graft shape retention. This is coupled with a cell-laden, biodegradable gelatin methacrylate bioink in a hybrid printing technique, and the composite scaffolds are evaluated in their mechanical properties, shape retention, and cytotoxicity. Additionally, a new shape analysis technique utilizing CloudCompare software is developed that expands the available toolbox for assessing scaffold aesthetic properties. With this dynamic 3D bioprinting strategy, complex geometries with robust internal structures can be easily modulated by varying the print ratio of non-degradable to sacrificial strands. The versatility of this hybrid printing fabrication platform can inspire the design of future multi-material regenerative implants.
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Affiliation(s)
- Sarah Van Belleghem
- Fischell Department of Bioengineering, Center for Engineering Complex Tissues, University of Maryland, 20742, USA
| | - Leopoldo Torres
- Fischell Department of Bioengineering, Center for Engineering Complex Tissues, University of Maryland, 20742, USA
| | - Marco Santoro
- Fischell Department of Bioengineering, Center for Engineering Complex Tissues, University of Maryland, 20742, USA
| | - Bhushan Mahadik
- Fischell Department of Bioengineering, Center for Engineering Complex Tissues, University of Maryland, 20742, USA
| | - Arley Wolfand
- Fischell Department of Bioengineering, Center for Engineering Complex Tissues, University of Maryland, 20742, USA
| | - Peter Kofinas
- Chemical and Biomolecular Engineering Department, University of Maryland, 20742, USA
| | - John P. Fisher
- Fischell Department of Bioengineering, Center for Engineering Complex Tissues, University of Maryland, 20742, USA
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16
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Daristotle JL, Lau LW, Erdi M, Hunter J, Djoum A, Srinivasan P, Wu X, Basu M, Ayyub OB, Sandler AD, Kofinas P. Sprayable and biodegradable, intrinsically adhesive wound dressing with antimicrobial properties. Bioeng Transl Med 2020; 5:e10149. [PMID: 31989038 PMCID: PMC6971445 DOI: 10.1002/btm2.10149] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 11/04/2019] [Accepted: 12/03/2019] [Indexed: 01/29/2023] Open
Abstract
Conventional wound dressings are difficult to apply to large total body surface area (TBSA) wounds, as they typically are prefabricated, require a layer of adhesive coating for fixation, and need frequent replacement for entrapped exudate. Large TBSA wounds as well as orthopedic trauma and low-resource surgery also have a high risk of infection. In this report, a sprayable and intrinsically adhesive wound dressing loaded with antimicrobial silver is investigated that provides personalized fabrication with minimal patient contact. The dressing is composed of adhesive and biodegradable poly(lactic-co-glycolic acid) and poly(ethylene glycol) (PLGA/PEG) blend fibers with or without silver salt (AgNO3). in vitro studies demonstrate that the PLGA/PEG/Ag dressing has antimicrobial properties and low cytotoxicity, with antimicrobial silver controllably released over 7-14 days. In a porcine partial-thickness wound model, the wounds treated with both antimicrobial and nonantimicrobial PLGA/PEG dressings heal at rates similar to those of the clinical, thin film polyurethane wound dressing, with similar scarring. However, PLGA/PEG adds a number of features beneficial for wound healing: greater exudate absorption, integration into the wound, a 25% reduction in dressing changes, and tissue regeneration with greater vascularization. There is also modest improvement in epidermis thickness compared to the control wound dressing.
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Affiliation(s)
- John L. Daristotle
- Fischell Department of BioengineeringUniversity of MarylandCollege ParkMaryland
| | - Lung W. Lau
- Sheikh Zayed Institute for Pediatric Surgical InnovationJoseph E. Robert Jr. Center for Surgical Care, Children's National Medical CenterWashingtonDistrict of Columbia
| | - Metecan Erdi
- Department of Chemical and Biomolecular EngineeringUniversity of MarylandCollege ParkMaryland
| | - Joseph Hunter
- Fischell Department of BioengineeringUniversity of MarylandCollege ParkMaryland
| | - Albert Djoum
- Department of Chemistry and BiochemistryUniversity of MarylandCollege ParkMaryland
| | - Priya Srinivasan
- Sheikh Zayed Institute for Pediatric Surgical InnovationJoseph E. Robert Jr. Center for Surgical Care, Children's National Medical CenterWashingtonDistrict of Columbia
| | - Xiaofang Wu
- Sheikh Zayed Institute for Pediatric Surgical InnovationJoseph E. Robert Jr. Center for Surgical Care, Children's National Medical CenterWashingtonDistrict of Columbia
| | - Mousumi Basu
- Sheikh Zayed Institute for Pediatric Surgical InnovationJoseph E. Robert Jr. Center for Surgical Care, Children's National Medical CenterWashingtonDistrict of Columbia
| | - Omar B. Ayyub
- Department of Chemical and Biomolecular EngineeringUniversity of MarylandCollege ParkMaryland
| | - Anthony D. Sandler
- Sheikh Zayed Institute for Pediatric Surgical InnovationJoseph E. Robert Jr. Center for Surgical Care, Children's National Medical CenterWashingtonDistrict of Columbia
| | - Peter Kofinas
- Department of Chemical and Biomolecular EngineeringUniversity of MarylandCollege ParkMaryland
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18
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Torres L, Daristotle JL, Ayyub OB, Bellato Meinhardt BM, Garimella H, Margaronis A, Seifert S, Bedford NM, Woehl TJ, Kofinas P. Structurally colored protease responsive nanoparticle hydrogels with degradation-directed assembly. Nanoscale 2019; 11:17904-17912. [PMID: 31552983 DOI: 10.1039/c9nr04624k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A tunable protease responsive nanoparticle hydrogel (PRNH) that demonstrates large non-iridescent color changes due to a degradation-directed assembly of nanoparticles is reported. Structurally colored composites are fabricated with silica particles, 4-arm poly(ethylene glycol) norbornene (4PEGN), and a proteolytically degradable peptide. When placed in a protease solution, the peptide crosslinks degrade causing electrostatic binding and adsorption of the polymer to the particle surface which leads to the assembly of particles into compact amorphous arrays with structural color. The particle surface charge and size is investigated to probe their effect on the assembly mechanism. Interestingly, only PRNHs with highly negative particle surface charge exhibit color changes after degradation. Ultra-small angle X-ray scattering revealed that the particles become coated in polymer after degradation, producing a material with less order compared to the initial state. Altering the particle diameter modulates the composites' color, and all sizes investigated (178-297 nm) undergo the degradation-directed assembly. Varying the amount of 4PEGN adjusts the swollen PRNH color and has no effect on the degradation-directed assembly. Taken together, the effects of surface charge, particle size, and polymer concentration allow for the formulation of new design rules for fabricating tunable PRNHs that display vivid changes in structural color upon degradation.
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Affiliation(s)
- Leopoldo Torres
- Fischell Department of Bioengineering, University of Maryland, Room 3102 A. James Clark Hall, 8278 Paint Branch Dr. and College Park, MD 20742, USA
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19
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Daristotle JL, Zaki ST, Lau LW, Torres L, Zografos A, Srinivasan P, Ayyub OB, Sandler AD, Kofinas P. Improving the adhesion, flexibility, and hemostatic efficacy of a sprayable polymer blend surgical sealant by incorporating silica particles. Acta Biomater 2019; 90:205-216. [PMID: 30954624 PMCID: PMC6549514 DOI: 10.1016/j.actbio.2019.04.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 04/01/2019] [Accepted: 04/03/2019] [Indexed: 12/14/2022]
Abstract
Commercially available surgical sealants for internal use either lack sufficient adhesion or produce cytotoxicity. This work describes a surgical sealant based on a polymer blend of poly(lactic-co-glycolic acid) (PLGA) and poly(ethylene glycol) (PEG) that increases wet tissue adherence by incorporation of nano-to-microscale silica particles, without significantly affecting cell viability, biodegradation rate, or local inflammation. In functional studies, PLGA/PEG/silica composite sealants produce intestinal burst pressures that are comparable to cyanoacrylate glue (160 mmHg), ∼2 times greater than the non-composite sealant (59 mmHg), and ∼3 times greater than fibrin glue (49 mmHg). The addition of silica to PLGA/PEG is compatible with a sprayable in situ deposition method called solution blow spinning and decreases coagulation time in vitro and in vivo. These improvements are biocompatible and cause minimal additional inflammation, demonstrating the potential of a simple composite design to increase adhesion to wet tissue through physical, noncovalent mechanisms and enable use in procedures requiring simultaneous occlusion and hemostasis. STATEMENT OF SIGNIFICANCE: Incorporating silica particles increases the tissue adhesion of a polymer blend surgical sealant. The particles enable interfacial physical bonding with tissue and enhance the flexibility of the bulk of the sealant, without significantly affecting cytotoxicity, inflammation, or biodegradation. These studies also demonstrate how silica particles decrease blood coagulation time. This surgical sealant improves upon conventional devices because it can be easily deposited with accuracy directly onto the surgical site as a solid polymer fiber mat. The deposition method, solution blow spinning, allows for high loading in the composite fibers, which are sprayed from a polymer blend solution containing suspended silica particles. These findings could easily be translated to other implantable or wearable devices due to the versatility of silica particles.
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Affiliation(s)
- John L Daristotle
- Fischell Department of Bioengineering, University of Maryland, Room 3102 A. James Clark Hall, 8278 Paint Branch Dr., College Park, MD 20742, USA
| | - Shadden T Zaki
- Department of Materials Science and Engineering, University of Maryland, 4418 Stadium Dr., College Park, MD 20742, USA
| | - Lung W Lau
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, 111 Michigan Avenue, NW Washington, DC 20010, USA
| | - Leopoldo Torres
- Fischell Department of Bioengineering, University of Maryland, Room 3102 A. James Clark Hall, 8278 Paint Branch Dr., College Park, MD 20742, USA
| | - Aristotelis Zografos
- Department of Materials Science and Engineering, University of Maryland, 4418 Stadium Dr., College Park, MD 20742, USA
| | - Priya Srinivasan
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, 111 Michigan Avenue, NW Washington, DC 20010, USA
| | - Omar B Ayyub
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, MD 20742, USA
| | - Anthony D Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Joseph E. Robert Jr. Center for Surgical Care, Children's National Medical Center, 111 Michigan Avenue, NW Washington, DC 20010, USA
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, 4418 Stadium Dr., College Park, MD 20742, USA.
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20
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Goertz JP, Colvin KM, Lippe AB, Daristotle JL, Kofinas P, White IM. Multistage Chemical Heating for Instrument-Free Biosensing. ACS Appl Mater Interfaces 2018; 10:33043-33048. [PMID: 30207445 DOI: 10.1021/acsami.8b11611] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Improving the portability of diagnostic medicine is crucial for alleviating global access-to-care deficiencies. This requires not only designing devices that are small and lightweight, but also autonomous and independent of electricity. Here, we present a strategy for conducting automated multistep diagnostic assays using chemically generated, passively regulated heat. Ligation and polymerization reagents for rolling circle amplification of nucleic acids are separated by meltable phase-change partitions, thus replacing precise manual reagent additions with automated partition melting. To actuate these barriers and individually initiate the various steps of the reaction, field ration heaters exothermically generate heat in a thermos, whereas fatty acids embedded in a carbonaceous matrix passively buffer the temperature around their melting points. Achieving multistage temperature profiles extend the capability of instrument-free diagnostic devices and improve the portability of reaction automation systems built around phase-change partitions.
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21
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Fathi P, Sikorski M, Christodoulides K, Langan K, Choi YS, Titcomb M, Ghodasara A, Wonodi O, Thaker H, Vural M, Behrens A, Kofinas P. Zeolite-loaded alginate-chitosan hydrogel beads as a topical hemostat. J Biomed Mater Res B Appl Biomater 2018; 106:1662-1671. [PMID: 28842967 PMCID: PMC5826813 DOI: 10.1002/jbm.b.33969] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 07/21/2017] [Accepted: 07/29/2017] [Indexed: 11/06/2022]
Abstract
Hemorrhage is the leading cause of preventable death after a traumatic injury, and the largest contributor to loss of productive years of life. Hemostatic agents accelerate hemostasis and help control hemorrhage by concentrating coagulation factors, acting as procoagulants and/or interacting with erythrocytes and platelets. Hydrogel composites offer a platform for targeting both mechanical and biological hemostatic mechanisms. The goal of this work was to develop hydrogel particles composed of chitosan, alginate, and zeolite, and to assess their potential to promote blood coagulation via multiple mechanisms: erythrocyte adhesion, factor concentration, and the ability to serve as a mechanical barrier to blood loss. Several particle compositions were synthesized and characterized. Hydrogel bead composition was optimized to achieve the highest swelling capacity, greatest erythrocyte adhesion, and minimal in vitro cytotoxicity. These results suggest a polymer hydrogel-aluminosilicate composite material may serve as a platform for an effective hemostatic agent that incorporates multiple mechanisms of action. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1662-1671, 2018.
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Affiliation(s)
- Parinaz Fathi
- Gemstone Honors Program, University of Maryland, College Park, Maryland 20742
| | - Michael Sikorski
- Gemstone Honors Program, University of Maryland, College Park, Maryland 20742
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742
| | | | - Kristen Langan
- Gemstone Honors Program, University of Maryland, College Park, Maryland 20742
| | - Yoon Sun Choi
- Gemstone Honors Program, University of Maryland, College Park, Maryland 20742
| | - Michael Titcomb
- Gemstone Honors Program, University of Maryland, College Park, Maryland 20742
| | - Anjali Ghodasara
- Gemstone Honors Program, University of Maryland, College Park, Maryland 20742
| | - Omasiri Wonodi
- Gemstone Honors Program, University of Maryland, College Park, Maryland 20742
| | - Hemi Thaker
- Gemstone Honors Program, University of Maryland, College Park, Maryland 20742
| | - Mert Vural
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
| | - Adam Behrens
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742
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22
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Vural M, Behrens AM, Hwang W, Ayoub JJ, Chasser D, von Wald Cresce A, Ayyub OB, Briber RM, Kofinas P. Spray-Processed Composites with High Conductivity and Elasticity. ACS Appl Mater Interfaces 2018; 10:13953-13962. [PMID: 29557171 PMCID: PMC6241284 DOI: 10.1021/acsami.8b00068] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Highly conductive elastic composites were constructed using multistep solution-based fabrication methods that included the deposition of a nonwoven polymer fiber mat through solution blow spinning and nanoparticle nucleation. High nanoparticle loading was achieved by introducing silver nanoparticles into the fiber spinning solution. The presence of the silver nanoparticles facilitates improved uptake of silver nanoparticle precursor in subsequent processing steps. The precursor is used to generate a second nanoparticle population, leading to high loading and conductivity. Establishing high nanoparticle loading in a microfibrous block copolymer network generated deformable composites that can sustain electrical conductivities reaching 9000 S/cm under 100% tensile strain. These conductive elastic fabrics can retain at least 70% of their initial electrical conductivity after being stretched to 100% strain and released for 500 cycles. This composite material system has the potential to be implemented in wearable electronics and robotic systems.
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Affiliation(s)
- Mert Vural
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Adam M. Behrens
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Wonseok Hwang
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Joseph J. Ayoub
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Dalton Chasser
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Arthur von Wald Cresce
- Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, U.S. Army Research Laboratory, Adelphi, Maryland 20783, United States
| | - Omar B. Ayyub
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Robert M. Briber
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Peter Kofinas
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States
- Corresponding Author
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23
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Kern NG, Behrens AM, Srinivasan P, Rossi CT, Daristotle JL, Kofinas P, Sandler AD. Solution blow spun polymer: A novel preclinical surgical sealant for bowel anastomoses. J Pediatr Surg 2017; 52:1308-1312. [PMID: 27956071 PMCID: PMC5459684 DOI: 10.1016/j.jpedsurg.2016.11.044] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 11/15/2016] [Accepted: 11/28/2016] [Indexed: 10/20/2022]
Abstract
BACKGROUND Solution blow spinning is a technique for depositing polymer fibers with promising potential use as a surgical sealant. This study assessed the feasibility and efficacy of solution blow spun polymer (BSP) for sealing bowel perforations in a mouse model of partial cecal transection. We then evaluated its use for reinforcing a surgical anastomosis in a preclinical piglet model. METHODS Three commercially available surgical sealants (fibrin glue, polyethylene glycol (PEG) hydrogel, and cyanoacrylate) were compared to BSP in the ability to seal partially transected cecum in mice. For anastomosis feasibility testing in a piglet model, piglets were subjected to small bowel transection with sutured anastomosis reinforced with BSP application. Outcome measures included anastomotic burst pressure, anastomotic leak rate, 14-day survival, and complication rate. RESULTS For the mouse model, the survival rates for the sealants were 30% for fibrin glue, 20% for PEG hydrogel, 78% for cyanoacrylate, and 67% for BSP. Three of 9 mice died after BSP administration because of perforation leak, failure to thrive with partial obstruction at the perforation site, and unknown causes. All other mice died of perforation leak. The mean burst pressure at 24h was significantly higher for BSP (81mm Hg) when compared to fibrin glue (6mm Hg, p=0.047) or PEG hydrogel (10mm Hg, p=0.047), and comparable to cyanoacrylate (64mm Hg, p=0.91). For piglets, 4 of 4 animals survived at 14days. Mean burst pressures at time of surgery were 37±5mm Hg for BSP and 11±9mm Hg for suture-only controls (p=0.09). CONCLUSIONS Solution blow spinning may be an effective technique as an adjunct for sealing of gastrointestinal anastomosis. Further preclinical testing is warranted to better understand BSP properties and alternative surgical applications.
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Affiliation(s)
- Nora G Kern
- Sheikh Zayed Institute for Pediatric Surgical Innovation at Children's National Health System, 111 Michigan Ave. NW, Washington, DC 20010, USA; Department of Urology, University of Virginia Health System, PO Box 800422, Charlottesville, VA 22908, USA.
| | - Adam M Behrens
- Fischell Department of Bioengineering, University of Maryland, 8228 Paint Branch Dr., College Park, MD 20742, USA
| | - Priya Srinivasan
- Sheikh Zayed Institute for Pediatric Surgical Innovation at Children's National Health System, 111 Michigan Ave. NW, Washington, DC 20010, USA
| | - Christopher T Rossi
- Department of Pathology, Children's National Health System, 111 Michigan Ave. NW, Washington, DC 20010, USA
| | - John L Daristotle
- Fischell Department of Bioengineering, University of Maryland, 8228 Paint Branch Dr., College Park, MD 20742, USA
| | - Peter Kofinas
- Fischell Department of Bioengineering, University of Maryland, 8228 Paint Branch Dr., College Park, MD 20742, USA
| | - Anthony D Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation at Children's National Health System, 111 Michigan Ave. NW, Washington, DC 20010, USA
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24
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Seo B, Lee C, Yoo D, Kofinas P, Piao Y. A magnetically recoverable photocatalyst prepared by supporting TiO2nanoparticles on a superparamagnetic iron oxide nanocluster core@fibrous silica shell nanocomposite. RSC Adv 2017. [DOI: 10.1039/c6ra27907d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A magnetically recoverable photocatalyst was prepared by supporting TiO2nanoparticles on a superparamagnetic iron oxide nanocluster core@fibrous silica shell nanocomposite.
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Affiliation(s)
- Bokyung Seo
- Program in Nano Science and Technology
- Department of Transdisciplinary Studies
- Graduate School of Convergence Science and Technology
- Seoul National University
- Seoul 151-742
| | - Chaedong Lee
- Program in Nano Science and Technology
- Department of Transdisciplinary Studies
- Graduate School of Convergence Science and Technology
- Seoul National University
- Seoul 151-742
| | - Donggeon Yoo
- Program in Nano Science and Technology
- Department of Transdisciplinary Studies
- Graduate School of Convergence Science and Technology
- Seoul National University
- Seoul 151-742
| | - Peter Kofinas
- Fischell Department of Bioengineering
- University of Maryland
- College Park
- USA
| | - Yuanzhe Piao
- Program in Nano Science and Technology
- Department of Transdisciplinary Studies
- Graduate School of Convergence Science and Technology
- Seoul National University
- Seoul 151-742
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Daristotle JL, Behrens AM, Sandler AD, Kofinas P. A Review of the Fundamental Principles and Applications of Solution Blow Spinning. ACS Appl Mater Interfaces 2016; 8:34951-34963. [PMID: 27966857 PMCID: PMC5673076 DOI: 10.1021/acsami.6b12994] [Citation(s) in RCA: 131] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Solution blow spinning (SBS) is a technique that can be used to deposit fibers in situ at low cost for a variety of applications, which include biomedical materials and flexible electronics. This review is intended to provide an overview of the basic principles and applications of SBS. We first describe a method for creating a spinnable polymer solution and stable polymer solution jet by manipulating parameters such as polymer concentration and gas pressure. This method is based on fundamental insights, theoretical models, and empirical studies. We then discuss the unique bundled morphology and mechanical properties of fiber mats produced by SBS, and how they compare with electrospun fiber mats. Applications of SBS in biomedical engineering are highlighted, showing enhanced cell infiltration and proliferation versus electrospun fiber scaffolds and in situ deposition of biodegradable polymers. We also discuss the impact of SBS in applications involving textiles and electronics, including ceramic fibers and conductive composite materials. Strategies for future research are presented that take advantage of direct and rapid polymer deposition via cost-effective methods.
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Affiliation(s)
- John L. Daristotle
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland 20742, United States
| | - Adam M. Behrens
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland 20742, United States
| | - Anthony D. Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation Joseph E. Robert Jr. Center for Surgical Care, Children’s National Medical Center, 111 Michigan Avenue NW, Washington, DC 20010, United States
| | - Peter Kofinas
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland 20742, United States
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26
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Behrens AM, Kim J, Hotaling N, Seppala JE, Kofinas P, Tutak W. Rapid fabrication of poly(DL-lactide) nanofiber scaffolds with tunable degradation for tissue engineering applications by air-brushing. Biomed Mater 2016; 11:035001. [PMID: 27121660 PMCID: PMC4963247 DOI: 10.1088/1748-6041/11/3/035001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Polymer nanofiber based materials have been widely investigated for use as tissue engineering scaffolds. While promising, these materials are typically fabricated through techniques that require significant time or cost. Here we report a rapid and cost effective air-brushing method for fabricating nanofiber scaffolds using a simple handheld apparatus, compressed air, and a polymer solution. Air-brushing also facilities control over the scaffold degradation rate without adversely impacting architecture. This was accomplished through a one step blending process of high (M w ≈ 100 000 g mol(-1)) and low (M w ≈ 25 000 g mol(-1)) molecular weight poly(DL-lactide) (PDLLA) polymers at various ratios (100:0, 70:30 and 50:50). Through this approach, we were able to control fiber scaffold degradation rate while maintaining similar fiber morphology, scaffold porosity, and bulk mechanical properties across all of the tested compositions. The impact of altered degradation rates was biologically evaluated in human bone marrow stromal cell (hBMSC) cultures for up to 16 days and demonstrated degradation rate dependence of both total DNA concentration and gene regulation.
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Affiliation(s)
- Adam M Behrens
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, MD, USA
| | - Jeffrey Kim
- Volpe Research Center ADA Foundation, 100 Bureau Dr, Gaithersburg, MD, USA
| | - Nathan Hotaling
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD, USA
| | - Jonathan E Seppala
- Materials Science and Engineering Division, National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD, USA
| | - Peter Kofinas
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, MD, USA
| | - Wojtek Tutak
- Volpe Research Center ADA Foundation, 100 Bureau Dr, Gaithersburg, MD, USA
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27
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Silverstein JS, Casey BJ, Kofinas P, Dair BJ. Protein Adsorption on Chemically Modified Block Copolymer Nanodomains: Influence of Charge and Flow. J Nanosci Nanotechnol 2016; 16:1460-70. [PMID: 27433605 PMCID: PMC6209447 DOI: 10.1166/jnn.2016.10895] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Understanding the interactions of biomacromolecules with nanoengineered surfaces is vital for assessing material biocompatibility. This study focuses on the dynamics of protein adsorption on nanopatterned block copolymers (BCPs). Poly(styrene)-block-poly(1,2-butadiene) BCPs functionalized with an acid, amine, amide, or captopril moieties were processed to produce nanopatterned films. These films were characterized using water contact angle measurements and atomic force microscopy in air and liquid to determine how the modification process affected. wettability and swelling. Protein adsorption experiments were conducted under static and dynamic conditions via a quartz crystal microbalance with dissipation. Proteins of various size, charge, and stability were investigated to determine whether their physical characteristics affected adsorption. Significantly decreased contact angles were caused by selective swelling of modified BCP domains. The results indicate that nanopatterned chemistry and experimental conditions strongly impact adsorption dynamics. Depending on the structural stability of the protein, polyelectrolyte surfaces significantly increased adsorption over controls. Further analysis suggested that protein stability may correlate with dissipation versus frequency plots.
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28
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Behrens AM, Lee NG, Casey BJ, Srinivasan P, Sikorski MJ, Daristotle JL, Sandler AD, Kofinas P. Biodegradable-Polymer-Blend-Based Surgical Sealant with Body-Temperature-Mediated Adhesion. Adv Mater 2015; 27:8056-61. [PMID: 26554545 PMCID: PMC4961426 DOI: 10.1002/adma.201503691] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 09/30/2015] [Indexed: 05/20/2023]
Abstract
The development of practical and efficient surgical sealants has the propensity to improve operational outcomes. A biodegradable polymer blend is fabricated as a nonwoven fiber mat in situ. After direct deposition onto the tissue of interest, the material transitions from a fiber mat to a film. This transition promotes polymer-substrate interfacial interactions leading to improved adhesion and surgical sealant performance.
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Affiliation(s)
- Adam M. Behrens
- Fischell Department of Bioengineering, 2330 Jeong H. Kim Engineering Building, University of Maryland, College Park, MD, USA
| | - Nora G. Lee
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Children’s National Medical Center, 111 Michigan Avenue, NW Washington, DC, USA
| | - Brendan J. Casey
- Office of Medical Products and Tobacco, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, Division of Biology, Chemistry and Materials Science, US Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD, USA
| | - Priya Srinivasan
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Children’s National Medical Center, 111 Michigan Avenue, NW Washington, DC, USA
| | - Michael J. Sikorski
- Fischell Department of Bioengineering, 2330 Jeong H. Kim Engineering Building, University of Maryland, College Park, MD, USA
| | - John L. Daristotle
- Fischell Department of Bioengineering, 2330 Jeong H. Kim Engineering Building, University of Maryland, College Park, MD, USA
| | - Anthony D. Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Children’s National Medical Center, 111 Michigan Avenue, NW Washington, DC, USA
| | - Peter Kofinas
- Fischell Department of Bioengineering, 2330 Jeong H. Kim Engineering Building, University of Maryland, College Park, MD, USA
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Abstract
The passive monitoring of biological environments by soft materials has a variety of nanobiotechnology applications; however, invoking distinct transitions in geometric, mechanical or optical properties remains a prevalent design challenge. We demonstrate here that close-packed nanoparticle-hydrogel composites can progress through a substantial shift in such properties by the use of a chemical-to-physical cross-link transition mediated by the catalytic activity of different proteases. Catalytic cleavage of the original hydrogel network structure initiates the self-assembled formation of a secondary, physically cross-linked network, causing a 1200% increase in storage modulus. Furthermore, this unique mechanism can be fabricated as a 3D photonic crystal with broad (∼240 nm), visible responses to the targeted enzymes. Moreover, the material provided threshold responses, requiring a certain extent of proteolytic activity before the transition occurred. This allowed for the fabrication of Boolean logic gates (OR and AND), which responded to a specific assortment of proteases. Ultimately, this mechanism enables the design of stimuli-responsive hydrogels, which can proceed through a secondary network formation, after an energetic barrier has been breached. Protease responsive hydrogel nanocomposites, described here, could offer avenues in degradation-stiffening and collapsing materials for a variety of biomaterial applications.
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30
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Ayyub OB, Behrens AM, Heligman BT, Natoli ME, Ayoub JJ, Cunningham G, Summar M, Kofinas P. Simple and inexpensive quantification of ammonia in whole blood. Mol Genet Metab 2015; 115:95-100. [PMID: 25936660 PMCID: PMC4462127 DOI: 10.1016/j.ymgme.2015.04.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 04/18/2015] [Accepted: 04/25/2015] [Indexed: 12/30/2022]
Abstract
Quantification of ammonia in whole blood has applications in the diagnosis and management of many hepatic diseases, including cirrhosis and rare urea cycle disorders, amounting to more than 5 million patients in the United States. Current techniques for ammonia measurement suffer from limited range, poor resolution, false positives or large, complex sensor set-ups. Here we demonstrate a technique utilizing inexpensive reagents and simple methods for quantifying ammonia in 100 μL of whole blood. The sensor comprises a modified form of the indophenol reaction, which resists sources of destructive interference in blood, in conjunction with a cation-exchange membrane. The presented sensing scheme is selective against other amine containing molecules such as amino acids and has a shelf life of at least 50 days. Additionally, the resulting system has high sensitivity and allows for the accurate reliable quantification of ammonia in whole human blood samples at a minimum range of 25 to 500 μM, which is clinically for rare hyperammonemic disorders and liver disease. Furthermore, concentrations of 50 and 100 μM ammonia could be reliably discerned with p = 0.0001.
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Affiliation(s)
- Omar B Ayyub
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, United States
| | - Adam M Behrens
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, United States
| | - Brian T Heligman
- Material Science and Engineering, University of Maryland, College Park, MD 20742, United States
| | - Mary E Natoli
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, United States
| | - Joseph J Ayoub
- Material Science and Engineering, University of Maryland, College Park, MD 20742, United States
| | - Gary Cunningham
- Genetics and Metabolism, Children's National Medical Center, Washington, DC 20010, United States
| | - Marshall Summar
- Genetics and Metabolism, Children's National Medical Center, Washington, DC 20010, United States.
| | - Peter Kofinas
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, United States.
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31
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Vural M, Behrens AM, Ayyub OB, Ayoub JJ, Kofinas P. Sprayable elastic conductors based on block copolymer silver nanoparticle composites. ACS Nano 2015; 9:336-44. [PMID: 25491507 PMCID: PMC4310637 DOI: 10.1021/nn505306h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 12/09/2014] [Indexed: 05/18/2023]
Abstract
Block copolymer silver nanoparticle composite elastic conductors were fabricated through solution blow spinning and subsequent nanoparticle nucleation. The reported technique allows for conformal deposition onto nonplanar substrates. We additionally demonstrated the ability to tune the strain dependence of the electrical properties by adjusting nanoparticle precursor concentration or localized nanoparticle nucleation. The stretchable fiber mats were able to display electrical conductivity values as high as 2000 ± 200 S/cm with only a 12% increase in resistance after 400 cycles of 150% strain. Stretchable elastic conductors with similar and higher bulk conductivity have not achieved comparable stability of electrical properties. These unique electromechanical characteristics are primarily the result of structural changes during mechanical deformation. The versatility of this approach was demonstrated by constructing a stretchable light emitting diode circuit and a strain sensor on planar and nonplanar substrates.
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Affiliation(s)
- Mert Vural
- Department of Materials Science and Engineering and Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Adam M. Behrens
- Department of Materials Science and Engineering and Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Omar B. Ayyub
- Department of Materials Science and Engineering and Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Joseph J. Ayoub
- Department of Materials Science and Engineering and Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Peter Kofinas
- Department of Materials Science and Engineering and Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
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32
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Argin S, Kofinas P, Lo YM. The cell release kinetics and the swelling behavior of physically crosslinked xanthan–chitosan hydrogels in simulated gastrointestinal conditions. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2014.02.018] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Behrens AM, Casey BJ, Sikorski MJ, Wu KL, Tutak W, Sandler AD, Kofinas P. In Situ Deposition of PLGA Nanofibers via Solution Blow Spinning. ACS Macro Lett 2014; 3:249-254. [PMID: 35590515 DOI: 10.1021/mz500049x] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nanofiber mats and scaffolds have been widely investigated for biomedical applications. Commonly fabricated using electrospinning, nanofibers are generated ex situ using an apparatus that requires high voltages and an electrically conductive target. We report the use of solution blow spinning to generate conformal nanofiber mats/meshes on any surface in situ, utilizing only a commercial airbrush and compressed CO2. Solution and deposition conditions of PLGA nanofibers were optimized and mechanical properties characterized with dynamic mechanical analysis. Nanofiber mat degradation was monitored for morphologic and molecular weight changes in vitro. Biocompatibility of the direct deposition of nanofibers onto two cell lines was demonstrated in vitro and interaction with blood was qualitatively assessed with scanning electron microscopy. A pilot animal study illustrated the wide potential of this technique across multiple surgical applications, including its use as a surgical sealant, hemostatic, and buttress for tissue repair.
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Affiliation(s)
- Adam M. Behrens
- Fischell
Department of Bioengineering, University of Maryland, 2330 Jeong
H. Kim Engineering Building, College Park, Maryland, United States
| | - Brendan J. Casey
- Office
of Medical Products and Tobacco, Center for Devices and Radiological
Health, Office of Science and Engineering Laboratories, Division of
Chemistry and Materials Science, U.S. Food and Drug Administration, 10903 New Hampshire Ave, Silver Spring, Maryland, United States
| | - Michael J. Sikorski
- Fischell
Department of Bioengineering, University of Maryland, 2330 Jeong
H. Kim Engineering Building, College Park, Maryland, United States
| | - Kyle L. Wu
- Sheikh Zayed
Institute
for Pediatric Surgical Innovation at Children’s National Medical
Center, 111 Michigan Ave NW, Washington, District of Columbia, United States
| | - Wojtek Tutak
- American
Dental Association Foundation, National Institute of
Standards and Technology, 100 Bureau
Drive, Building 224, Room A153, Gaithersburg, Maryland, United States
| | - Anthony D. Sandler
- Sheikh Zayed
Institute
for Pediatric Surgical Innovation at Children’s National Medical
Center, 111 Michigan Ave NW, Washington, District of Columbia, United States
| | - Peter Kofinas
- Fischell
Department of Bioengineering, University of Maryland, 2330 Jeong
H. Kim Engineering Building, College Park, Maryland, United States
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34
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Behrens AM, Sikorski MJ, Li T, Wu ZJ, Griffith BP, Kofinas P. Blood-aggregating hydrogel particles for use as a hemostatic agent. Acta Biomater 2014; 10:701-8. [PMID: 24185001 DOI: 10.1016/j.actbio.2013.10.029] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 09/27/2013] [Accepted: 10/24/2013] [Indexed: 12/22/2022]
Abstract
The body is unable to control massive blood loss without treatment. Available hemostatic agents are often expensive, ineffective or raise safety concerns. Synthetic hydrogel particles are an inexpensive and promising alternative. In this study we synthesized and characterized N-(3-aminopropyl)methacrylamide (APM) hydrogel particles and investigated their use as a hemostatic material. The APM hydrogel particles were synthesized via inverse suspension polymerization with a narrow size distribution and rapid swelling behavior. In vitro coagulation studies showed hydrogel particle blood aggregate formation as well as bulk blood coagulation inhibition. In vivo studies using multiple rat injury and ovine liver laceration models demonstrated the particles' ability to aid in rapid hemostasis. Subsequent hematoxylin and eosin and Carstairs' method staining of the ovine liver incision sites showed significant hemostatic plug formation. This study suggests that these cationic hydrogel particles form a physical barrier to blood loss by forming aggregates, while causing a general decrease in coagulation activity in the bulk. The formation of a rapid sealant through aggregation and the promotion of local hemostasis through electrostatic interactions are coupled with a decrease in overall coagulation activity. These interactions require the interplay of a variety of mechanisms stemming from a simple synthetic platform.
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Affiliation(s)
- Adam M Behrens
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, MD 20742, USA
| | - Michael J Sikorski
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, MD 20742, USA
| | - Tieluo Li
- Department of Surgery, University of Maryland School of Medicine, Medical School Teaching Facility Building Room 434F, 10 South Pine Street, Baltimore, MD 21201, USA
| | - Zhongjun J Wu
- Department of Surgery, University of Maryland School of Medicine, Medical School Teaching Facility Building Room 434F, 10 South Pine Street, Baltimore, MD 21201, USA
| | - Bartley P Griffith
- Department of Surgery, University of Maryland School of Medicine, Medical School Teaching Facility Building Room 434F, 10 South Pine Street, Baltimore, MD 21201, USA
| | - Peter Kofinas
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, MD 20742, USA.
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35
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Behrens AM, Sikorski MJ, Kofinas P. Hemostatic strategies for traumatic and surgical bleeding. J Biomed Mater Res A 2013; 102:4182-94. [PMID: 24307256 DOI: 10.1002/jbm.a.35052] [Citation(s) in RCA: 170] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 11/18/2013] [Accepted: 12/02/2013] [Indexed: 12/23/2022]
Abstract
Wide interest in new hemostatic approaches has stemmed from unmet needs in the hospital and on the battlefield. Many current commercial hemostatic agents fail to fulfill the design requirements of safety, efficacy, cost, and storage. Academic focus has led to the improvement of existing strategies as well as new developments. This review will identify and discuss the three major classes of hemostatic approaches: biologically derived materials, synthetically derived materials, and intravenously administered hemostatic agents. The general class is first discussed, then specific approaches discussed in detail, including the hemostatic mechanisms and the advancement of the method. As hemostatic strategies evolve and synthetic-biologic interactions are more fully understood, current clinical methodologies will be replaced.
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Affiliation(s)
- Adam M Behrens
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland, 20742
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36
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Mariani AM, Natoli ME, Kofinas P. Enzymatic activity preservation and protection through entrapment within degradable hydrogels. Biotechnol Bioeng 2013; 110:2994-3002. [DOI: 10.1002/bit.24971] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Revised: 05/21/2013] [Accepted: 05/28/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Angela M. Mariani
- Fischell Department of Bioengineering; University of Maryland; College Park Maryland 20742
| | - Mary E. Natoli
- Fischell Department of Bioengineering; University of Maryland; College Park Maryland 20742
| | - Peter Kofinas
- Fischell Department of Bioengineering; University of Maryland; College Park Maryland 20742
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Casey BJ, Behrens AM, Tsinas ZI, Hess JR, Wu ZJ, Griffith BP, Kofinas P. In vitroandin vivoevaluation of polymer hydrogels for hemorrhage control. Journal of Biomaterials Science, Polymer Edition 2013; 24:1781-93. [DOI: 10.1080/09205063.2013.801707] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Brendan J. Casey
- a Fischell Department of Bioengineering , University of Maryland , 2330 Jeong H. Kim Engineering Building, College Park , MD , 20742 , USA
| | - Adam M. Behrens
- a Fischell Department of Bioengineering , University of Maryland , 2330 Jeong H. Kim Engineering Building, College Park , MD , 20742 , USA
| | - Zois I. Tsinas
- a Fischell Department of Bioengineering , University of Maryland , 2330 Jeong H. Kim Engineering Building, College Park , MD , 20742 , USA
| | - John R. Hess
- b Department of Pathology , University of Maryland School of Medicine, University of Maryland Medical Center , Blood Bank N2W50a, Baltimore , MD , 21201 , USA
| | - Zhongjun J. Wu
- c Department of Surgery , University of Maryland School of Medicine , MSTF Building Room 434F, 10 South Pine Street, Baltimore , MD , 21201 , USA
| | - Bartley P. Griffith
- c Department of Surgery , University of Maryland School of Medicine , MSTF Building Room 434F, 10 South Pine Street, Baltimore , MD , 21201 , USA
| | - Peter Kofinas
- a Fischell Department of Bioengineering , University of Maryland , 2330 Jeong H. Kim Engineering Building, College Park , MD , 20742 , USA
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38
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Bacalocostantis I, Mane VP, Goodley AS, Bentley WE, Muro S, Kofinas P. Investigating polymer thiolation in gene delivery. Journal of Biomaterials Science, Polymer Edition 2012; 24:912-26. [DOI: 10.1080/09205063.2012.727266] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Irene Bacalocostantis
- a Fischell Department of Bioengineering , University of Maryland , College Park , MD , 20742 , USA
| | - Viraj P. Mane
- a Fischell Department of Bioengineering , University of Maryland , College Park , MD , 20742 , USA
| | - Addison S. Goodley
- a Fischell Department of Bioengineering , University of Maryland , College Park , MD , 20742 , USA
| | - William E. Bentley
- a Fischell Department of Bioengineering , University of Maryland , College Park , MD , 20742 , USA
- b Institute for Bioscience and Biotechnology Research, University of Maryland , College Park , MD , 20742 , USA
| | - Silvia Muro
- a Fischell Department of Bioengineering , University of Maryland , College Park , MD , 20742 , USA
- b Institute for Bioscience and Biotechnology Research, University of Maryland , College Park , MD , 20742 , USA
| | - Peter Kofinas
- a Fischell Department of Bioengineering , University of Maryland , College Park , MD , 20742 , USA
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Bacalocostantis I, Mane VP, Kang MS, Goodley AS, Muro S, Kofinas P. Effect of thiol pendant conjugates on plasmid DNA binding, release, and stability of polymeric delivery vectors. Biomacromolecules 2012; 13:1331-9. [PMID: 22515194 DOI: 10.1021/bm3004786] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Polymers have attracted much attention as potential gene delivery vectors due to their chemical and structural versatility. However, several challenges associated with polymeric carriers, including low transfection efficiencies, insufficient cargo release, and high cytotoxicity levels have prevented clinical implementation. Strong electrostatic interactions between polymeric carriers and DNA cargo can prohibit complete cargo release within the cell. As a result, cargo DNA never reaches the cell's nucleus where gene expression takes place. In addition, highly charged cationic polymers have been correlated with high cytotoxicity levels, making them unsuitable carriers in vivo. Using poly(allylamine) (PAA) as a model, we investigated how pH-sensitive disulfide cross-linked polymer networks can improve the delivery potential of cationic polymer carriers. To accomplish this, we conjugated thiol-terminated pendant chains onto the primary amines of PAA using 2-iminothiolane, developing three new polymer vectors with 5, 13, or 20% thiol modification. Unmodified PAA and thiol-conjugated polymers were tested for their ability to bind and release plasmid DNA, their capacity to protect genetic cargo from enzymatic degradation, and their potential for endolysosomal escape. Our results demonstrate that polymer-plasmid complexes (polyplexes) formed by the 13% thiolated polymer demonstrate the greatest delivery potential. At high N/P ratios, all thiolated polymers (but not unmodified counterparts) were able to resist decomplexation in the presence of heparin, a negatively charged polysaccharide used to mimic in vivo polyplex-protein interactions. Further, all thiolated polymers exhibited higher buffering capacities than unmodified PAA and, therefore, have a greater potential for endolysosomal escape. However, 5 and 20% thiolated polymers exhibited poor DNA binding-release kinetics, making them unsuitable carriers for gene delivery. The 13% thiolated polymers, on the other hand, displayed high DNA binding efficiency and pH-sensitive release.
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Affiliation(s)
- Irene Bacalocostantis
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, USA
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40
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Silverstein JS, Casey BJ, Natoli ME, Dair BJ, Kofinas P. Rapid Modular Synthesis and Processing of Thiol–Ene Functionalized Styrene–Butadiene Block Copolymers. Macromolecules 2012. [DOI: 10.1021/ma300304h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Joshua S. Silverstein
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
- Center for Devices and Radiological
Health, Office of Science and Engineering Laboratories, Division of
Chemistry and Materials Science, Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Brendan J. Casey
- Center for Devices and Radiological
Health, Office of Science and Engineering Laboratories, Division of
Chemistry and Materials Science, Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Mary E. Natoli
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Benita J. Dair
- Center for Devices and Radiological
Health, Office of Science and Engineering Laboratories, Division of
Chemistry and Materials Science, Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Peter Kofinas
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
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Ayyub OB, Sekowski JW, Yang TI, Zhang X, Briber RM, Kofinas P. Color changing block copolymer films for chemical sensing of simple sugars. Biosens Bioelectron 2011; 28:349-54. [DOI: 10.1016/j.bios.2011.07.043] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 07/15/2011] [Accepted: 07/18/2011] [Indexed: 11/27/2022]
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Yang TI, Brown RNC, Kempel LC, Kofinas P. Controlled synthesis of core-shell iron-silica nanoparticles and their magneto-dielectric properties in polymer composites. Nanotechnology 2011; 22:105601. [PMID: 21289404 DOI: 10.1088/0957-4484/22/10/105601] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Low loss core-shell iron-silica nanocomposites with improved magneto-dielectric properties at radio frequencies (1 MHz-1 GHz) were successfully fabricated. A new simple method was developed to synthesize metallic iron (Fe) nanoparticles with uniform size distribution in an aqueous environment at room temperature. Citric acid and oleic acid served as surface-capping agents to control the particle size of the synthesized Fe nanoparticles. Smaller Fe nanoparticles with narrower particle size distribution were obtained as the concentration ratio of iron ions to carboxylic acid groups decreased. The Fe nanoparticles were subsequently coated with silica (SiO(2)) layers to prevent the iron cores oxidizing. Polymer composites were prepared by incorporating Fe@SiO(2) nanoparticles with polydimethylsiloxane (PDMS) elastomers. Experimental results showed that the dielectric permittivity (ε) and magnetic permeability (μ) of the polymer composite increased with increasing amount of Fe@SiO(2) nanoparticle doping. The dielectric loss (tanδ) was near 0.020 at a frequency of 1 GHz.
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Affiliation(s)
- T I Yang
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
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Abstract
ABSTRACTThe goal of this research is to produce molecular imprinted polymers (MIPs), which selectively bind glucose over other sugars. MIP hydrogels against glucose exhibited binding capacities in excess of 0.6 grams of glucose per gram of dry gel in a 100 % DI H2O glucose solution, as well as in a 50–50 % glucose-fructose solution mixture. Equilibrium binding capacities of fructose were lower than those observed with respect to glucose, indicating an isomeric preference for the binding of glucose over fructose. Although it is expected that imprinted cavities will be distorted due to the swelling of the hydrogel in water, our experiments show that even the swollen gels exhibit remarkable glucose recognition. This synthetic and characterization methodology for MIPs might thus offer exciting avenues for novel biomimetic recognition and isomeric separation techniques.
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Casey BJ, Behrens AM, Hess JR, Wu ZJ, Griffith BP, Kofinas P. FVII Dependent Coagulation Activation in Citrated Plasma by Polymer Hydrogels. Biomacromolecules 2010; 11:3248-55. [DOI: 10.1021/bm101147w] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Brendan J. Casey
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland 20742, United States, Department of Pathology, University of Maryland School of Medicine, University of Maryland Medical Center, Blood Bank N2W50a, Baltimore, Maryland 21201, United States, and Department of Surgery, University of Maryland School of Medicine, Medical School Teaching Facility Building Room 434F, 10 South Pine Street, Baltimore, Maryland 21201, United States
| | - Adam M. Behrens
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland 20742, United States, Department of Pathology, University of Maryland School of Medicine, University of Maryland Medical Center, Blood Bank N2W50a, Baltimore, Maryland 21201, United States, and Department of Surgery, University of Maryland School of Medicine, Medical School Teaching Facility Building Room 434F, 10 South Pine Street, Baltimore, Maryland 21201, United States
| | - John R. Hess
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland 20742, United States, Department of Pathology, University of Maryland School of Medicine, University of Maryland Medical Center, Blood Bank N2W50a, Baltimore, Maryland 21201, United States, and Department of Surgery, University of Maryland School of Medicine, Medical School Teaching Facility Building Room 434F, 10 South Pine Street, Baltimore, Maryland 21201, United States
| | - Zhongjun J. Wu
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland 20742, United States, Department of Pathology, University of Maryland School of Medicine, University of Maryland Medical Center, Blood Bank N2W50a, Baltimore, Maryland 21201, United States, and Department of Surgery, University of Maryland School of Medicine, Medical School Teaching Facility Building Room 434F, 10 South Pine Street, Baltimore, Maryland 21201, United States
| | - Bartley P. Griffith
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland 20742, United States, Department of Pathology, University of Maryland School of Medicine, University of Maryland Medical Center, Blood Bank N2W50a, Baltimore, Maryland 21201, United States, and Department of Surgery, University of Maryland School of Medicine, Medical School Teaching Facility Building Room 434F, 10 South Pine Street, Baltimore, Maryland 21201, United States
| | - Peter Kofinas
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland 20742, United States, Department of Pathology, University of Maryland School of Medicine, University of Maryland Medical Center, Blood Bank N2W50a, Baltimore, Maryland 21201, United States, and Department of Surgery, University of Maryland School of Medicine, Medical School Teaching Facility Building Room 434F, 10 South Pine Street, Baltimore, Maryland 21201, United States
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Lee W, Kofinas P, Briber R. Small angle neutron scattering study of deuterated sodium dodecylsulfate micellization in dilute poly((2–dimethylamino)ethyl methacrylate) solutions. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.04.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Janiak DS, Ayyub OB, Kofinas P. Effects of Charge Density on the Recognition Properties of Molecularly Imprinted Polymeric Hydrogels. Macromolecules 2009. [DOI: 10.1021/ma8027722] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel S. Janiak
- Department of Materials Science and Engineering and Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742
| | - Omar B. Ayyub
- Department of Materials Science and Engineering and Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742
| | - Peter Kofinas
- Department of Materials Science and Engineering and Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742
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Abstract
A poly(allylamine hydrochloride) carcinoembryonic antigen-imprinted hydrogel was synthesized using a water-soluble crosslinker, ethylene glycol diglycidyl ether, to investigate its viability for protein recognition. The imprinting factor of the imprinted hydrogel toward carcinoembryonic antigen was found to be approximately 5, while the imprinting factor of the imprinted hydrogel toward alpha-fetoprotein was determined to be approximately 2, suggesting selectivity and specificity toward the template protein. This work lays the foundation for the development of a novel line of imprinted hydrogel systems capable of protein recognition for diagnostic and therapeutic applications.
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Affiliation(s)
- Brendan J Casey
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, USA
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Royston E, Ghosh A, Kofinas P, Harris MT, Culver JN. Self-assembly of virus-structured high surface area nanomaterials and their application as battery electrodes. Langmuir 2008; 24:906-12. [PMID: 18154364 DOI: 10.1021/la7016424] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
High area nickel and cobalt surfaces were assembled using modified Tobacco mosaic virus (TMV) templates. Rod-shaped TMV templates (300 x 18 nm) engineered to encode unique cysteine residues were self-assembled onto gold patterned surfaces in a vertically oriented fashion, producing a >10-fold increase in surface area. Electroless deposition of ionic metals onto surface-assembled virus templates produced uniform metal coatings up to 40 nm in thickness. Within a nickel-zinc battery system, the incorporation of virus-assembled electrode surfaces more than doubled the total electrode capacity. When combined, these findings demonstrate that surface-assembled virus templates provide a robust platform for the fabrication of oriented high surface area materials.
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Affiliation(s)
- Elizabeth Royston
- School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
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