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Pomeraniec Altieri N, Coria-Oriundo LL, Angelomé PC, Battaglini F, Martínez Ricci ML, Méndez De Leo LP. Unexpected enhancement of pH-stability in Au 3+/Ag + loaded H-bonded layer-by-layer thin films. SOFT MATTER 2023; 19:6018-6031. [PMID: 37505204 DOI: 10.1039/d3sm00893b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
In this work, a polymeric film was synthesized through a layer-by-layer (LBL) self-assembly technique using polyacrylic acid (PAA) and polyethylene oxide (PEO), resulting in the formation of a hydrogen-bonded LBL film. The formation of these films was evaluated by PMIRRAS and QCM-D. The synergy of these techniques allowed the understanding of the mechanism of formation of the film by showing the H-bonding formation and film growth. Au and Ag metal ions were successfully incorporated into the films, as corroborated by the combination of the information obtained by XRR and PMIRRAS. The films were exposed to increasing pH, showing a pronounced improvement in stability in films loaded with Au ions, extending the stability from pH 4 to 10. This behavior allows the use of this system in a wider range of applications, including the possibility of working in biological conditions. On the other hand, films loaded with Ag disintegrated at pH above 4. At acidic pH (below 3), these films released the Ag ions, which may be useful for the preparation of antibacterial stimuli-responsive nanomaterials. In both cases, the films were adequate to produce metal nanoparticles by metal loading and in situ reduction.
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Affiliation(s)
- Nicolás Pomeraniec Altieri
- Instituto de Química Física de los Materiales, Medio Ambiente y Energía (INQUIMAE - CONICET) Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Intendente Guiraldes S/N - 1er piso, Buenos Aires, Argentina.
| | - Lucy L Coria-Oriundo
- Instituto de Química Física de los Materiales, Medio Ambiente y Energía (INQUIMAE - CONICET) Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Intendente Guiraldes S/N - 1er piso, Buenos Aires, Argentina.
| | - Paula C Angelomé
- Gerencia Química & Instituto de Nanociencia y Nanotecnología, Centro Atómico Constituyentes, CNEA, CONICET, Av. Gral. Paz 1499, 1650 San Martín, Buenos Aires, Argentina
| | - Fernando Battaglini
- Instituto de Química Física de los Materiales, Medio Ambiente y Energía (INQUIMAE - CONICET) Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Intendente Guiraldes S/N - 1er piso, Buenos Aires, Argentina.
| | - María Luz Martínez Ricci
- Instituto de Química Física de los Materiales, Medio Ambiente y Energía (INQUIMAE - CONICET) Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Intendente Guiraldes S/N - 1er piso, Buenos Aires, Argentina.
| | - Lucila P Méndez De Leo
- Instituto de Química Física de los Materiales, Medio Ambiente y Energía (INQUIMAE - CONICET) Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Intendente Guiraldes S/N - 1er piso, Buenos Aires, Argentina.
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Klačić T, Jugl A, Pekař M, Kovačević D. High-Resolution Ultrasonic Spectroscopy: Looking at the Interpolyelectrolyte Neutralization from a Different Perspective. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c02349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- Tin Klačić
- Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia
| | - Adam Jugl
- Institute of Physical and Applied Chemistry & Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Miloslav Pekař
- Institute of Physical and Applied Chemistry & Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic
| | - Davor Kovačević
- Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia
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3
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Nagasawa A, Watanabe K, Suga K, Nagao D. Independent control over sizes and surface properties of polystyrene-based particles using multiple comonomers. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2022.130376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Klačić T, Peranić N, Radatović B, Kovačević D. Biocompatible hydroxyapatite nanoparticles as templates for the preparation of thin film polyelectrolyte multilayer nanocapsules. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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5
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Mahajan K, Rojekar S, Desai D, Kulkarni S, Bapat G, Zinjarde S, Vavia P. Layer-by-Layer Assembled Nanostructured Lipid Carriers for CD-44 Receptor-Based Targeting in HIV-Infected Macrophages for Efficient HIV-1 Inhibition. AAPS PharmSciTech 2021; 22:171. [PMID: 34100170 DOI: 10.1208/s12249-021-01981-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Accepted: 03/04/2021] [Indexed: 02/01/2023] Open
Abstract
Macrophages act as a cellular reservoir in HIV infection. Elimination of HIV from macrophages has been an unfulfilled dream due to the failure of drugs to reach them. To address this, we developed CD44 receptor-targeted, novel hyaluronic acid (HA)-coated nanostructured lipid carriers (NLCs) of efavirenz via washless layer-by-layer (LbL) assembly of HA and polyallylamine hydrochloride (PAH). NLCs were subjected to TEM analysis, size and zeta potential, in vitro release and encapsulation efficiency studies. The uptake of NLCs in THP-1 cells was studied using fluorescence microscopy and flow cytometry. The anti-HIV efficacy was evaluated using p24 antigen inhibition assay. NLCs were found to be spherical in shape with anionic zeta potential (-23.66 ± 0.87 mV) and 241.83 ± 5.38 nm particle size. NLCs exhibited prolonged release of efavirenz during in vitro drug release studies. Flow cytometry revealed 1.73-fold higher uptake of HA-coated NLCs in THP-1 cells. Cytotoxicity studies showed no significant change in cell viability in presence of NLCs as compared with the control. HA-coated NLCs distributed throughout the cell including cytoplasm, plasma membrane and nucleus, as observed during fluorescence microscopy. HA-coated NLCs demonstrated consistent and significantly higher inhibition (81.26 ± 1.70%) of p24 antigen which was 2.08-fold higher than plain NLCs. The obtained results suggested preferential uptake of HA-coated NLCs via CD44-mediated uptake. The present finding demonstrates that HA-based CD44 receptor targeting in HIV infection is an attractive strategy for maximising the drug delivery to macrophages and achieve effective viral inhibition.
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Khizar S, Ahmad NM. pH Tunable Thin Film Gradients of Magnetic Polymer Colloids for MRI Diagnostics. Polymers (Basel) 2020; 12:polym12092116. [PMID: 32957488 PMCID: PMC7569873 DOI: 10.3390/polym12092116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 05/29/2020] [Accepted: 06/05/2020] [Indexed: 11/18/2022] Open
Abstract
Magnetic polymer colloids comprising of magnetite (Fe3O4) nanoparticles and Eudragit E100 were employed to fabricate thin film gradients and were investigated for in-vitro magnetic resonance imaging. Magnetic polymer colloids (MPC) and polyacrylic acid (PAA) with stimuli-responsive cationic and anionic functional groups respectively facilitate the formation of thin film gradients via layer by layer technique. The characteristics of films were controlled by changing the pH and level of the adsorbing solutions that lead to the development of gradient films having 5.5, 10.5 and 15.5 bilayers. Optical microscopy, scanning electron microscopy and magnetic force microscopy was carried out to determine the surface coverage of films. Surface wettability demonstrated the hydrophilicity of adsorbed colloids. The developed thin-film gradients were explored for in vitro magnetic resonance imaging that offers a point of care lab-on-chip as a dip-stick approach for ultrasensitive in-vitro molecular diagnosis of biological fluids.
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Godoy-Gallardo M, Labay C, Hosta-Rigau L. Tyrosinase-Loaded Multicompartment Microreactor toward Melanoma Depletion. ACS APPLIED MATERIALS & INTERFACES 2019; 11:5862-5876. [PMID: 30605301 DOI: 10.1021/acsami.8b20275] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Melanoma is malignant skin cancer occurring with increasing prevalence with no effective treatment. A unique feature of melanoma cells is that they require higher concentrations of ltyrosine (l-tyr) for expansion than normal cells. As such, it has been demonstrated that dietary l-tyr restriction lowers systemic l-tyr and suppresses melanoma advancement in mice. Unfortunately, this diet is not well tolerated by humans. An alternative approach to impede melanoma progression will be to administer the enzyme tyrosinase (TYR), which converts l-tyr into melanin. Herein, a multicompartment carrier consisting of a polymer shell entrapping thousands of liposomes is employed to act as a microreactor depleting l-tyr in the presence of melanoma cells. It is shown that the TYR enzyme can be incorporated within the liposomal subunits with preserved catalytic activity. Aiming to mimic the dynamic environment at the tumor site, l-tyr conversion is conducted by co-culturing melanoma cells and microreactors in a microfluidic setup with applied intratumor shear stress. It is demonstrated that the microreactors are concurrently depleting l-tyr, which translates into inhibited melanoma cell growth. Thus, the first microreactor where the depletion of a substrate translates into antitumor properties in vitro is reported.
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Affiliation(s)
- Maria Godoy-Gallardo
- Department of Micro- and Nanotechnology, Center for Nanomedicine and Theranostics, DTU Nanotech , Technical University of Denmark , Building 423 , 2800 Lyngby , Denmark
| | - Cédric Labay
- Department of Micro- and Nanotechnology, Center for Nanomedicine and Theranostics, DTU Nanotech , Technical University of Denmark , Building 423 , 2800 Lyngby , Denmark
| | - Leticia Hosta-Rigau
- Department of Micro- and Nanotechnology, Center for Nanomedicine and Theranostics, DTU Nanotech , Technical University of Denmark , Building 423 , 2800 Lyngby , Denmark
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8
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Palomec-Garfias AF, Jardim KV, Sousa MH, Márquez-Beltrán C. Influence of polyelectrolyte chains on surface charge and magnetization of iron oxide nanostructures. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.03.070] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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9
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Yu H, Pan HM, Trau D, Patzel V. Capsule-like Safe Genetic Vectors-Cell-Penetrating Core-Shell Particles Selectively Release Functional Small RNA and Entrap Its Encoding DNA. ACS APPLIED MATERIALS & INTERFACES 2018; 10:21113-21124. [PMID: 29869496 DOI: 10.1021/acsami.8b04294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The breakthrough of genetic therapy is set back by the lack of suitable genetic vector systems. We present the development of permeability-tunable, capsule-like, polymeric, micron-sized, core-shell particles for delivery of recombinant nucleic acids into target cells. These particles were demonstrated to effectively release rod-shaped small hairpin RNA and to selectively retain the RNA-encoding DNA template, which was designed to form a bulky tripartite structure. Thus, they can serve as delivery vectors preloaded with cargo RNA or alternatively as RNA-producing micro-bioreactors. The internalization of particles by human tissue culture cells inversely correlated with particle size and with the cell to particle ratio, although at a higher than stoichiometric excess of particles over cells, cell viability was impaired. Among primary human peripheral blood mononuclear cells, up to 50% of the monocytes displayed positive uptake of particles. Finally, these particles efficiently delivered siRNA into HEK293T cells triggering functional knockdown of the target gene lamin A/C. Particle-mediated knockdown was superior to that observed after conventional siRNA delivery via lipofection. Core-shell particles protect encapsulated nucleic acids from degradation and target cell genomes from direct contact with recombinant DNA, thus representing a promising delivery vector system that can be explored for genetic therapy and vaccination.
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Affiliation(s)
- Han Yu
- Department of Microbiology & Immunology, Yong Loo Lin School of Medicine , National University of Singapore , 5 Science Drive 2 , 117545 , Singapore
- School of Biological Sciences , Nanyang Technological University , 61 Biopolis Drive , 138673 , Singapore
| | - Houwen Matthew Pan
- Department of Biomedical Engineering , National University of Singapore , 4 Engineering Drive 3 , 117583 , Singapore
- School of Chemical and Biomedical Engineering , Nanyang Technological University , 70 Nanyang Drive , 637457 , Singapore
| | - Dieter Trau
- Department of Biomedical Engineering , National University of Singapore , 4 Engineering Drive 3 , 117583 , Singapore
| | - Volker Patzel
- Department of Microbiology & Immunology, Yong Loo Lin School of Medicine , National University of Singapore , 5 Science Drive 2 , 117545 , Singapore
- Department of Medicine , Addenbrooke's Hospital, University of Cambridge , Cambridge CB2 0QQ , U.K
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10
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Chen Q, Jing J, Qi H, Ahmed I, Yang H, Liu X, Lu TL, Boccaccini AR. Electric Field-Assisted Orientation of Short Phosphate Glass Fibers on Stainless Steel for Biomedical Applications. ACS APPLIED MATERIALS & INTERFACES 2018; 10:11529-11538. [PMID: 29504741 DOI: 10.1021/acsami.8b01378] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Structural and compositional modifications of metallic implant surfaces are being actively investigated to achieve improved bone-to-implant bonding. In this study, a strategy to modify bulk metallic surfaces by electrophoretic deposition (EPD) of short phosphate glass fibers (sPGF) is presented. Random and aligned orientation of sPGF embedded in a poly(acrylic acid) matrix is achieved by vertical and horizontal EPD, respectively. The influence of EPD parameters on the degree of alignment is investigated to pave the way for the fabrication of highly aligned sPGF structures in large areas. Importantly, the oriented sPGF structure in the coating, owing to the synergistic effects of bioactive composition and fiber orientation, plays an important role in directional cell migration and enhanced proliferation. Moreover, gene expression of MC3T3-E1 cells cultured with different concentrations of sPGF is thoroughly assessed to elucidate the potential stimulating effect of sPGF on osteogenic differentiation. This study represents an innovative exploitation of EPD to develop textured surfaces by orientation of fibers in the macroscale, which shows great potential for directional functionalization of metallic implants.
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Affiliation(s)
- Qiang Chen
- Institute of Biomaterials, Department of Materials Science and Engineering , University of Erlangen-Nuremberg , Cauerstrasse 6 , Erlangen 91058 , Germany
| | | | | | - Ifty Ahmed
- Faculty of Engineering, Department of Mechanical, Materials and Manufacturing Engineering , University of Nottingham , Nottingham NG 7 2RD , United Kingdom
| | | | - Xianhu Liu
- National Engineering Research Center for Advanced Polymer Processing Technology , Zhengzhou University , Zhengzhou 450002 , China
| | | | - Aldo R Boccaccini
- Institute of Biomaterials, Department of Materials Science and Engineering , University of Erlangen-Nuremberg , Cauerstrasse 6 , Erlangen 91058 , Germany
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11
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Lee SK, Hwang G, Woo J, Park J, Kim J. Characterization of Responsive Hydrogel Nanoparticles upon Polyelectrolyte Complexation. Polymers (Basel) 2017; 9:E66. [PMID: 30970744 PMCID: PMC6431993 DOI: 10.3390/polym9020066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 02/13/2017] [Accepted: 02/13/2017] [Indexed: 11/17/2022] Open
Abstract
Characterization of responsive hydrogels and their interaction with other molecules have significantly expanded our understanding of the functional materials. We here report on the response of poly(N-isopropylacrylamide-co-acrylic acid) (pNIPAm-co-AAc) nanogels to the addition of the poly(allylamine hydrochloride) (PAH) in aqueous dispersions. We find that the hydrodynamic radius and stability of nanogels are dependent on the PAH/nanogel stoichiometry. If the nanogel solution is titrated with very small aliquots of PAH, the nanogels decrease in radius until the equivalence point, followed by aggregation at suprastoichiometric PAH additions. Conversely, when titrated with large aliquots, the nanogel charge switches rapidly from anionic to cationic, and no aggregation is observed. This behavior correlates well with electrophoretic mobility measurements, which shows the nanogel charge transitioning from negative to positive upon PAH addition. The volume phase transition temperature (VPTT) of the nanogels is also measured to discover the effect of polyelectrolyte complexation on the deswelling thermodynamics. These data show that charge neutralization upon PAH addition decreases the VPTT of the nanogel at pH 6.5. However, if an excess amount of PAH is added to the nanogel solution, the VPTT shifts back to higher temperatures due to the formation of a net positive charge in the nanogel network.
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Affiliation(s)
- Su-Kyoung Lee
- Yonsei-IBS Institute, Yonsei University, Seoul 03722, Korea.
| | - Gyuri Hwang
- STEM Research Institute, Fairfax, VA 22031, USA.
| | - Jihyun Woo
- STEM Research Institute, Fairfax, VA 22031, USA.
| | - Joseph Park
- STEM Research Institute, Fairfax, VA 22031, USA.
| | - Jongseong Kim
- Yonsei-IBS Institute, Yonsei University, Seoul 03722, Korea.
- STEM Research Institute, Fairfax, VA 22031, USA.
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12
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Ahab A, Rohman F, Iskandar F, Haryanto F, Arif I. A simple straightforward thermal decomposition synthesis of PEG-covered Gd 2 O 3 (Gd 2 O 3 @PEG) nanoparticles. ADV POWDER TECHNOL 2016. [DOI: 10.1016/j.apt.2016.06.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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13
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Gu Y, Ma Y, Vogt BD, Zacharia NS. Contraction of weak polyelectrolyte multilayers in response to organic solvents. SOFT MATTER 2016; 12:1859-1867. [PMID: 26699080 DOI: 10.1039/c5sm02313k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Weak polyelectrolyte multilayers (PEMs) prepared by the layer-by-layer assembly technique have recently been found to demonstrate a unique contraction upon exposure to organic solvents. This response is dependent upon which organic solvent is employed, and fundamental questions have not been clarified regarding the correlation of the magnitude of the film contraction with solvent type. In this work, we used solubility parameters to analyze the response of branched poly(ethylene imine)/poly(acrylic acid) (BPEI/PAA) multilayers when exposed to a variety of solvents. BPEI/PAA multilayers were immersed in a series of 16 different organic solvents and solvent mixtures. Immersion in organic solvent caused film dehydration and therefore contraction and also induced changes in the mechanical properties of PEMs. The film thickness was the best predictor of how a film swelled in water or contracted in organic solvent when using different batches of commercially available polyelectrolytes, rather than polyelectrolyte assembly pH conditions. The degree of film contraction was correlated with Hansen and Kamlet-Taft solubility parameters as well as solvent dielectric constant. In most cases, the hydrogen bonding ability of solvents is the primary factor to determine the magnitude of film contraction. For these solvents, increasing the temperature which corresponds to decreasing the strength of hydrogen bonding, also decreases the ability to dehydrate the films. For solvents that do not follow these trends with the strength of hydrogen bonding, a stronger correlation was found between contraction and dielectric constant, indicating that both traditional solvent quality arguments and electrostatics are important to understanding the contraction of PEMs in organic solvents.
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Affiliation(s)
- Yuanqing Gu
- Department of Polymer Engineering, University of Akron, Akron, OH 44325, USA.
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Crespy D, Landfester K, Fickert J, Rohwerder M. Self-Healing for Anticorrosion Based on Encapsulated Healing Agents. SELF-HEALING MATERIALS 2016. [DOI: 10.1007/12_2015_342] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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15
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Nagaraja AT, You YH, Choi JW, Hwang JH, Meissner KE, McShane MJ. Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process. J Colloid Interface Sci 2015; 466:432-41. [PMID: 26771506 DOI: 10.1016/j.jcis.2015.12.040] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 12/19/2015] [Accepted: 12/21/2015] [Indexed: 10/22/2022]
Abstract
The layer-by-layer modification of ≈5 nm mercaptocarboxylic acid stabilized gold nanoparticles was studied in an effort to illustrate effective means to overcome practical issues in handling and performing surface modification of such extremely small materials. To accomplish this, each layer deposition cycle was separated into a multi-step process wherein solution pH was controlled in two distinct phases of polyelectrolyte adsorption and centrifugation. Additionally, a solvent precipitation step was introduced to make processing more amenable by concentrating the sample and exchanging solution pH before ultracentrifugation. The pH-dependent assembly on gold nanoparticles was assessed after each layer deposition cycle by monitoring the plasmon peak absorbance location, surface charge, and the percentage of nanoparticles recovered. The selection of solution pH during the adsorption phase was found to be a critical parameter to enhance particle recovery and maximize surface charge when coating with weak polyelectrolytes. One bilayer was deposited with a high yield and the modified particles exhibited enhanced colloidal stability across a broad pH range and increased ionic strength. These findings support the adoption of this multi-step processing approach as an effective and generalizable approach to improve stability of high surface curvature particles.
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Affiliation(s)
- Ashvin T Nagaraja
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, United States
| | - Yil-Hwan You
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, United States
| | - Jeong-Wan Choi
- Department of Materials Science and Engineering, Hongik University, 121-791 Seoul, South Korea
| | - Jin-Ha Hwang
- Department of Materials Science and Engineering, Hongik University, 121-791 Seoul, South Korea
| | - Kenith E Meissner
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, United States; Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, United States
| | - Michael J McShane
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, United States; Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, United States.
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16
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Zan X, Garapaty A, Champion JA. Engineering Polyelectrolyte Capsules with Independently Controlled Size and Shape. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:7601-7608. [PMID: 26114616 DOI: 10.1021/acs.langmuir.5b01578] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polyelectrolyte capsules (PECs) are a promising delivery system that has the ability to carry a large payload of a variety of cargoes. Controlling PEC properties is critical to understanding and tuning their cellular uptake efficiency, kinetics, and mechanism as well as their biodistribution in the body. The lack of a method to independently engineer PEC size, shape, and chemistry impedes both basic understanding of how physicochemical parameters affect PEC behavior in drug delivery and other applications, and the ability to optimize parameters for best function. Here, we report the successful fabrication of PECs having constant surface chemistry with independently controlled size and shape by combining soft organic templates created by the particle stretching method and a modified layer-by-layer (LBL) deposition process. Changing the template dispersion solution during LBL deposition from water to ethanol allowed us to overcome previous issues with organic templates, such as aggregation and template removal. These results will contribute not only to the basic study of the role of capsule shape and size on its function but also to the optimization of capsule properties for drug or imaging carriers, sensors, reactors, and other applications.
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Affiliation(s)
- Xingjie Zan
- ‡Institute of Biomaterials and Engineering, Wenzhou Medical University, Chashan University Town, Wenzhou, Zhejiang Province 325035, PR China
- §Wenzhou Institute of Biomaterials and Engineering, 16 Xinsan Rd Hi-tech Industry Park, Wenzhou, Zhejiang Province 325011, PR China
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17
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Saha S, Loo SCJ. Recent developments in multilayered polymeric particles – from fabrication techniques to therapeutic formulations. J Mater Chem B 2015; 3:3406-3419. [DOI: 10.1039/c5tb00086f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Multilayered particles are emerging as a powerful platform in pharmaceutics, especially for targeted, triggered and sustained drug delivery.
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Affiliation(s)
- Sampa Saha
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
| | - Say Chye Joachim Loo
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore 639798
- Singapore
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18
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van Ravensteijn BGP, Kegel WK. Colloids with continuously tunable surface charge. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10590-10599. [PMID: 25127340 DOI: 10.1021/la501993c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this paper, we present a robust way to tune the surface potential of polystyrene colloids without changing the pH, ionic strength, etc. The colloids are composed of a cross-linked polystyrene core and a cross-linked vinylbenzyl chloride layer. Besides the chlorine groups, the particle surface contains sulfate/sulfonate groups (arising from the polymerization initiators) that provide a negative surface potential. Performing a Menschutkin reaction on the surface chlorine groups with tertiary amines allows us to introduce quaternary, positively charged amines. The overall charge on the particles is then determined by the ratio between the sulfate/sulfonate moieties and the quaternary amines. Using this process, we were able to invert the charge in a continuous manner without losing colloidal stability upon passing the isoelectric point. The straightforward reaction mechanism together with the fact that the reaction could be quenched rapidly resulted in a colloidal system in which the ζ potential can be tuned between -80 and 45 mV. As proof of principle, the positively charged particles were used in heterocoagulation experiments with nanometer- and micrometer-sized negatively charged silica particles to create geometrically well-defined colloidal (nano) clusters.
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Affiliation(s)
- Bas G P van Ravensteijn
- Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for NanoMaterials Science, Utrecht University , 3584 CH Utrecht, The Netherlands
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19
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Tan YF, Mundargi RC, Chen MHA, Lessig J, Neu B, Venkatraman SS, Wong TT. Layer-by-layer nanoparticles as an efficient siRNA delivery vehicle for SPARC silencing. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:1790-8. [PMID: 24510544 DOI: 10.1002/smll.201303201] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Indexed: 05/07/2023]
Abstract
Efficient and safe delivery systems for siRNA therapeutics remain a challenge. Elevated secreted protein, acidic, and rich in cysteine (SPARC) protein expression is associated with tissue scarring and fibrosis. Here we investigate the feasibility of encapsulating SPARC-siRNA in the bilayers of layer-by-layer (LbL) nanoparticles (NPs) with poly(L-arginine) (ARG) and dextran (DXS) as polyelectrolytes. Cellular binding and uptake of LbL NPs as well as siRNA delivery were studied in FibroGRO cells. siGLO-siRNA and SPARC-siRNA were efficiently coated onto hydroxyapatite nanoparticles. The multilayered NPs were characterized with regard to particle size, zeta potential and surface morphology using dynamic light scattering and transmission electron microscopy. The SPARC-gene silencing and mRNA levels were analyzed using ChemiDOC western blot technique and RT-PCR. The multilayer SPARC-siRNA incorporated nanoparticles are about 200 nm in diameter and are efficiently internalized into FibroGRO cells. Their intracellular fate was also followed by tagging with suitable reporter siRNA as well as with lysotracker dye; confocal microscopy clearly indicates endosomal escape of the particles. Significant (60%) SPARC-gene knock down was achieved by using 0.4 pmole siRNA/μg of LbL NPs in FibroGRO cells and the relative expression of SPARC mRNA reduced significantly (60%) against untreated cells. The cytotoxicity as evaluated by xCelligence real-time cell proliferation and MTT cell assay, indicated that the SPARC-siRNA-loaded LbL NPs are non-toxic. In conclusion, the LbL NP system described provides a promising, safe and efficient delivery platform as a non-viral vector for siRNA delivery that uses biopolymers to enhance the gene knock down efficiency for the development of siRNA therapeutics.
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Affiliation(s)
- Yang Fei Tan
- Singapore Eye Research Institute, 11 Third Hospital Avenue, 168751, Singapore
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Nugraha C, Bora M, Venkatraman SS. Release retardation of model protein on polyelectrolyte-coated PLGA nano- and microparticles. PLoS One 2014; 9:e92393. [PMID: 24647768 PMCID: PMC3960216 DOI: 10.1371/journal.pone.0092393] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 02/21/2014] [Indexed: 01/08/2023] Open
Abstract
PEM capsules have been proposed for vehicles of drug microencapsulation, with the release triggered by pH, salt, magnetic field, or light. When built on another carrier encapsulating drugs, such as nanoparticles, it could provide additional release barrier to the releasing drug, providing further control to drug release. Although liposomes have received considerable attention with PEM coating for sustained drug release, similar results employing PEM built on poly(lactic-co-lycolic acid) (PLGA) particles is scant. In this work, we demonstrate that the build-up pH and polyelectrolyte pairs of PEM affect the release retardation of BSA from PLGA particles. PAH/PSS pair, the most commonly used polyelectrolyte pair, was used in comparison with PLL/DES. In addition, we also demonstrate that the release retardation effect of PEM-coated PLGA particles diminishes as the particle size increases. We attribute this to the diminishing relative thickness of the PEM coating with respect to the size of the particle as the particle size increases, reducing the diffusional resistance of the PEM.
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Affiliation(s)
- Chandra Nugraha
- School of Materials Science & Engineering, Nanyang Technological University, Singapore, Singapore
| | - Meghali Bora
- School of Materials Science & Engineering, Nanyang Technological University, Singapore, Singapore
| | - Subbu S. Venkatraman
- School of Materials Science & Engineering, Nanyang Technological University, Singapore, Singapore
- * E-mail:
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Hess A, Aksel N. Yield stress and scaling of polyelectrolyte multilayer modified suspensions: effect of polyelectrolyte conformation during multilayer assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11236-11243. [PMID: 23952570 DOI: 10.1021/la401625p] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The yield stress of polyelectrolyte multilayer modified suspensions exhibits a surprising dependence on the polyelectrolyte conformation of multilayer films. The rheological data scale onto a universal master curve for each polyelectrolyte conformation as the particle volume fraction, φ, and the ionic strength of the background fluid, I, are varied. It is shown that rough films with highly coiled, brushy polyelectrolytes significantly enhance the yield stress. Moreover, via the ionic strength I of the background fluid, the dynamic yield stress of brushy polyelectrolyte multilayers can be finely adjusted over 2 decades.
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Affiliation(s)
- Andreas Hess
- Department of Mechanics and Fluid Dynamics, Freiberg University of Mining and Technology , Freiberg, Saxony, D-09596 Germany , and
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Nagaraja AT, Sooresh A, Meissner KE, McShane MJ. Processing and characterization of stable, pH-sensitive layer-by-layer modified colloidal quantum dots. ACS NANO 2013; 7:6194-6202. [PMID: 23782214 DOI: 10.1021/nn402061t] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Quantum Dots (QDs) stabilized with dihydrolipoic acid (DHLA) were used as a template for layer-by-layer (LbL) modification to study the effect on the QD optical properties. We studied several different polyelectrolytes to determine that large quantities of monodisperse DHLA-QDs could only be obtained with the weak polyelectrolyte pair of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA). The key to this success was the development of a two-step method to split the LbL process into adsorption and centrifugation phases, which require different pH solutions for optimum success. Solution pH is highlighted as an important factor to achieve sufficient QD surface coverage and QD recovery during wash cycles. We optimized the process to scale up synthesis by introducing a solvent precipitation step before ultracentrifugation that, when coupled with the correct pH conditions, results in a mean QD recovery of 86-90% after three wash cycles. We found that adsorption of PAH had a negligible effect on the quantum yield and lifetime but an additional layer of PAA resulted in a substantial decrease in both quantum yield and lifetime that could not be recovered by the addition of more layers. The PAH coating provides a protective coating that extends DHLA-QDs stability, prevents photo-oxidation mediated aggregation, alleviates concerns over batch variability, and results in pH-dependent emission.
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Affiliation(s)
- Ashvin T Nagaraja
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, USA
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Yang D, Ma J, Zhang Q, Li N, Yang J, Raju PA, Peng M, Luo Y, Hui W, Chen C, Cui Y. Polyelectrolyte-coated gold magnetic nanoparticles for immunoassay development: toward point of care diagnostics for syphilis screening. Anal Chem 2013; 85:6688-95. [PMID: 23735054 DOI: 10.1021/ac400517e] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Immediate response for disease control relies on simple, inexpensive, and sensitive diagnostic tests, highly sought after for timely and accurate test of various diseases, including infectious diseases. Composite Fe3O4/Au nanoparticles have attracted considerable interest in diagnostic applications due to their unique physical and chemical properties. Here, we developed a simple coating procedure for gold magnetic nanoparticles (GMNs) with poly(acrylic acid) (PAA). PAA-coated GMNs (PGMNs) were stable and monodispersed and characterized by Fourier transform-infrared spectroscopy (FT-IR), transmission electron microscopy, UV-visible scanning spectrophotometry, thermogravimetric analysis, and Zetasizer methodologies. For diagnostic application, we established a novel lateral flow immunoassay (LFIA) strip test system where recombinant Treponema pallidum antigens (r-Tp) were conjugated with PGMNs to construct a particle probe for detection of anti-Tp antibodies. Intriguingly, the particle probes specifically identified Tp antibodies with a detection limitation as low as 1 national clinical unit/mL (NCU/mL). An ample pool of 1020 sera samples from three independent hospitals were obtained to assess our PGMNs-based LFIA strips, which exhibited substantially high values of sensitivity and specificity for all clinical tests (higher than 97%) and, therefore, proved to be a suitable approach for syphilis screening at a point-of-care test manner.
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Affiliation(s)
- Dong Yang
- College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
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Gokhale AA, Lu J, Lee I. Immobilization of cellulase on magnetoresponsive graphene nano-supports. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcatb.2013.01.025] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Vidyasagar A, Sung C, Losensky K, Lutkenhaus JL. pH-Dependent Thermal Transitions in Hydrated Layer-by-Layer Assemblies Containing Weak Polyelectrolytes. Macromolecules 2012. [DOI: 10.1021/ma3020454] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Ajay Vidyasagar
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Choonghyun Sung
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Kristen Losensky
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Jodie L. Lutkenhaus
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
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Yang C, Liu P. Chitosan/Functionalized Multiwalled Carbon Nanotubes Multilayer Hollow Microspheres Prepared via Layer-by-Layer Assembly Technique. Ind Eng Chem Res 2012. [DOI: 10.1021/ie301666z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chao Yang
- State Key Laboratory of Applied Organic Chemistry and
Institute of Polymer Science and Engineering, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Peng Liu
- State Key Laboratory of Applied Organic Chemistry and
Institute of Polymer Science and Engineering, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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Ye S, Wang C, Liu X, Tong Z. Multilayer nanocapsules of polysaccharide chitosan and alginate through layer-by-layer assembly directly on PS nanoparticles for release. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 16:909-23. [PMID: 16128296 DOI: 10.1163/1568562054255691] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Polysaccharide multilayer nanocapsules have been fabricated in aqueous media by the layer-by-layer self-assembly of chitosan (CHI) and sodium alginate (ALG) on monodisperse polystyrene (PS) nanoparticles with a diameter of 180 nm as template, followed by removal of the templates through dissolving in THF. The pH and added salt concentration of the polyelectrolyte deposition solutions were optimized to ensure the alternating deposition. Consequently, the most suitable pH values were found to be 6.0-8.0 for ALG and 3.5 for CHI and were used in the deposition. The concentration of added NaCl used in the adsorption solutions was 0.5 M, which led to an average thickness of about 13 nm for 5 bilayers of CHI/ALG shell-wall. zeta-potential indicated the stepwise and alternating adsorption of CHI and ALG to form multilayer film on the PS nanoparticles. The characteristic bands of PS residue almost disappeared in the IR spectrum of the nanocapsule after dipped in THF, confirming thorough removal of PS templates from the core-shell particles. TEM, SEM and AFM were utilized to observe the nanocapsules of about 225 nm in diameter (by TEM). A hydrophilic drug model, acridine hydrochloride (AH), was chosen to investigate the loading and release properties of the nanocapsules. The positively charged AH spontaneously deposited into the capsule due to the electrostatic interaction with the negatively charged styrene sulfonate residues from the PS template inside the capsule. The rate of AH release became slightly slower when the capsule wall was cross-linked with glutaraldehyde, but the accumulative released amount for the cross-linked capsule was obviously reduced. These nanocapsules made from nature polysaccharides have a potential application in controlled drug release.
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Affiliation(s)
- Shiqu Ye
- Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, P. R. China
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Malinin AS, Kalashnikova IV, Rakhnyanskaya AA, Yaroslavov AA. Adsorption of cationic polymers on the surfaces of anionic glass microspheres. POLYMER SCIENCE SERIES A 2012. [DOI: 10.1134/s0965545x1201004x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
Over the last decade, the interest in electrospun nanomaterials and their applications has increased. The fascinating and unparalleled properties of electrospun nanomaterials, such as large surface-to-volume ratios and high open porosity, have opened new and unexpected fields of application, especially in ultrasensitive sensors. By exploiting the inherent physical, electrical and mechanical properties of nanomaterials, it is possible to improve the performance of conventional sensors by increasing their sensitivity, selectivity, portability and power efficiency. In this chapter, the recent progress in the development of electrospun nanomaterials is reviewed. In particular, applications in some predominant sensing approaches, such as acoustic wave, resistive, photoelectric, optical and biological, are discussed.
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Sun B, Flessner RM, Saurer EM, Jewell CM, Fredin NJ, Lynn DM. Characterization of pH-induced changes in the morphology of polyelectrolyte multilayers assembled from poly(allylamine) and low molecular weight poly(acrylic acid). J Colloid Interface Sci 2011; 355:431-41. [DOI: 10.1016/j.jcis.2010.12.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Revised: 12/01/2010] [Accepted: 12/02/2010] [Indexed: 10/18/2022]
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31
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Kinnane CR, Such GK, Caruso F. Tuning the Properties of Layer-by-Layer Assembled Poly(acrylic acid) Click Films and Capsules. Macromolecules 2011. [DOI: 10.1021/ma102593k] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cameron R. Kinnane
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Georgina K. Such
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Frank Caruso
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
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Yuan W, Lu Z, Li CM. Controllably layer-by-layer self-assembled polyelectrolytes/nanoparticle blend hollow capsules and their unique properties. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03925j] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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33
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Zhang W, Zhang A, Guan Y, Zhang Y, Zhu XX. Silver-loading in uncrosslinked hydrogen-bonded LBL films: structure change and improved stability. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm02369h] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Grech JMR, Mano JF, Reis RL. Processing and characterization of chitosan microspheres to be used as templates for layer-by-layer assembly. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2010; 21:1855-1865. [PMID: 20364364 DOI: 10.1007/s10856-010-4055-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2007] [Accepted: 03/09/2010] [Indexed: 05/29/2023]
Abstract
Chitosan (Ch) microspheres have been developed by precipitation method, cross-linked with glutaraldehyde and used as a template for layer-by-layer (LBL) deposition of two natural polyelectrolytes. Using a LBL methodology, Ch microspheres were alternately coated with hyaluronic acid (HA) and Ch under mild conditions. The roughness of the Ch-based crosslinked microspheres was characterized by atomic force microscopy (AFM). Morphological characterization was performed by environmental scanning electron microscopy (ESEM), scanning electron microscopy (SEM) and stereolight microscopy. The swelling behaviour of the microspheres demonstrated that the ones with more bilayers presented the highest water uptake and the uncoated cross-linked Ch microspheres showed the lowest uptake capability. Microspheres presented spherical shape with sizes ranging from 510 to 840 mum. ESEM demonstrated that a rougher surface with voids is formed in multilayered microspheres caused by the irregular stacking of the layers. A short term mechanical stability assay was also performed, showing that the LBL procedure with more than five bilayers of HA/Ch over Ch cross-linked microspheres provide higher mechanical stability.
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Affiliation(s)
- Jessica M R Grech
- Department of Polymer Engineering, 3B's Research Group-Biomaterials, Biodegradables and Biomimetics, Campus de Gualtar, 4710-057 Braga, Portugal
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35
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Wang N, Zhang G, Ji S, Qin Z, Liu Z. The salt-, pH- and oxidant-responsive pervaporation behaviors of weak polyelectrolyte multilayer membranes. J Memb Sci 2010. [DOI: 10.1016/j.memsci.2010.03.002] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Jia G, You H, Liu K, Zheng Y, Guo N, Zhang H. Highly uniform Gd2O3 hollow microspheres: template-directed synthesis and luminescence properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5122-5128. [PMID: 19921796 DOI: 10.1021/la903584j] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Well-dispersed, uniform Gd(2)O(3) hollow microspheres have been successfully fabricated via a urea-based homogeneous precipitation method in the presence of colloidal melamine formaldehyde (MF) microspheres as templates, followed by subsequent heat treatment. The main process was carried out under aqueous conditions without any organic solvents, surfactants, or etching agents. The as-obtained Gd(2)O(3) microspheres with a spherical shape and hollow structure are uniform in size and distribution, and the thickness of the shell is about 200 nm. The lanthanide ion (Ln(3+))-doped Gd(2)O(3) hollow microspheres exhibit bright down- and upconversion luminescence with different colors coming from different activator ions under ultraviolet or 980 nm light excitation, which might find potential applications in fields such as drug delivery or biological labeling because of their excellent dispersing and luminescence properties. Furthermore, this synthesis route may be of great significance in the preparation of other hollow spherical materials.
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Affiliation(s)
- Guang Jia
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China
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37
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Park J, McShane MJ. Dual-function nanofilm coatings with diffusion control and protein resistance. ACS APPLIED MATERIALS & INTERFACES 2010; 2:991-7. [PMID: 20384292 DOI: 10.1021/am900673r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
To date, limited examples of polyelectrolyte multilayers (PEMs) can be found that truly exploit the power of layer-by-layer nanoassembly to combine multiple functions into a complex multilayer. We demonstrate that PEMs can be designed as optimized coatings for implantable biosensors, exhibiting both diffusion control and protein resistance. PEM coatings comprising strong-weak and weak-weak pairs were evaluated, resulting in decreases in glucose diffusivity up to 5 orders of magnitude compared to water. Addition of poly(ethylene glycol) (PEG)-grafted terminal layers on the base diffusion-controlling multilayers substantially improved resistance to albumin adsorption relative to unmodified PEMs. For transport-controlling films comprising strong-weak polyelectrolyte pairs, the consistent diffusivity was observed even after exposure to protein-containing solutions, indicating minimal effects of biofouling. In contrast, the transport behavior of weak-weak polyelectrolyte pairs was susceptible to alteration by protein exposure, resulting in large variation in diffusivity, even when protein-resistant outer layers were employed.
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Affiliation(s)
- Jaebum Park
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA
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Zhan Q, Qian J, Li X, He S. A study of mesoporous silica-encapsulated gold nanorods as enhanced light scattering probes for cancer cell imaging. NANOTECHNOLOGY 2010; 21:055704. [PMID: 20023304 DOI: 10.1088/0957-4484/21/5/055704] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Mesoporous encapsulation of gold nanorods (GNRs) in a silica shell of controllable thickness (4.5-25.5 nm) was realized through a single-step coating method without any intermediary coating. The dependence of localized surface plasmon resonance (LSPR) extinction spectra of the coated GNRs on the thickness of the silica shell was investigated with both simulation and experiments, which agreed well with each other. It was found that cetyltrimethyl ammonium bromide (CTAB) molecules, which act as surfactants for the GNRs and dissociate in the solution, greatly affect the silica coating. Mesoporous silica-encapsulated GNRs were also shown to be highly biocompatible and stable in bio-environments. Based on LSPR enhanced scattering, mesoporous silica-encapsulated GNRs were utilized for dark field scattering imaging of cancer cells. Biomolecule-conjugated mesoporous silica-encapsulated GNRs were specifically taken up by cancer cells in vitro, justifying their use as effective optical probes for early cancer diagnosis. Mesoporous silica can also be modified with functional groups and conjugated with certain biomolecules for specific labeling on mammalian cells as well as carrying drugs or biomolecules into biological cells.
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Affiliation(s)
- Qiuqiang Zhan
- Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, People's Republic of China
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39
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Landfester K, Musyanovych A, Mailänder V. From polymeric particles to multifunctional nanocapsules for biomedical applications using the miniemulsion process. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.23786] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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40
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Xiao S, Shen M, Ma H, Guo R, Zhu M, Wang S, Shi X. Fabrication of water-stable electrospun polyacrylic acid-based nanofibrous mats for removal of copper (II) ions in aqueous solution. J Appl Polym Sci 2010. [DOI: 10.1002/app.31816] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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41
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Martí M, Fabregat G, Estrany F, Alemán C, Armelin E. Nanostructured conducting polymer for dopamine detection. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01364a] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Imoto T, Kida T, Matsusaki M, Akashi M. Preparation and Unique pH-Responsive Properties of Novel Biodegradable Nanocapsules Composed of Poly(γ-glutamic acid) and Chitosan as Weak Polyelectrolytes. Macromol Biosci 2009; 10:271-7. [DOI: 10.1002/mabi.200900272] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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43
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Dragan ES, Bucatariu F. Cross-Linked Multilayers of Poly(vinyl amine) as a Single Component and Their Interaction with Proteins. Macromol Rapid Commun 2009; 31:317-22. [PMID: 21590909 DOI: 10.1002/marc.200900630] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Revised: 09/18/2009] [Indexed: 11/07/2022]
Abstract
Novel multilayer thin films that consist solely of cross-linked single component layers are generated by a selective cross-linking of the poly(vinyl amine) (PVAm) layers in [PVAm/poly(acrylic acid) (PAA)](n) thin films constructed either on silica particles or silicon wafers, followed by the removal of PAA. The surface topography of the (PVAm)(n) multilayer thin films, before and after the adsorption of human serum albumin (HSA), has been studied by atomic force microscopy on the freeze-dried films. The decrease of the average roughness of the film after the adsorption of HSA showed the protein was adsorbed into the (PVAm)(n) film making these films potential reservoirs for proteins.
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Affiliation(s)
- Ecaterina S Dragan
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41 A, 700487 Iasi, Romania.
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Tristán F, Palestino G, Menchaca JL, Pérez E, Atmani H, Cuisinier F, Ladam G. Tunable protein-resistance of polycation-terminated polyelectrolyte multilayers. Biomacromolecules 2009; 10:2275-83. [PMID: 19618907 DOI: 10.1021/bm900453s] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The prevention of nonspecific protein adsorption is a crucial prerequisite for many biomedical and biotechnological applications. Therefore, the design of robust and versatile methods conferring optimal protein-resistance properties to surfaces has become a challenging issue. Here we report the unexpected case of polycation-ending polyelectrolyte multilayers (PEM) that efficiently prevented the adsorption of a negatively charged model protein, glucose oxidase (GOX). PEM films were based on two typical weak poyelectrolytes: poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA). No chemical modification of the polyelectrolytes was required and tunable GOX adsorption was possible by simply changing the buildup pH conditions. Protein-resistance properties are attributed to high film hydration becoming the predominant factor over electrostatic interactions. We explain this effect by oscillations of the internal PAA ionization state throughout the buildup, which results in an excess of carboxylic acid groups within the film. This excess acts as a reservoir of potential carboxylate groups compensating the outer PAH positive charges. Partial results indicated that the system was also resistant to the adsorption of a positively charged protein, lysozyme. Control of the internal ionization of weak polyelectrolyte multilayers might open a route toward simple tuning of protein adsorption. These results should help to rationalize the design of biomaterials, biosensors, or protein separation devices.
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Hoda N, Larson RG. Explicit- and Implicit-Solvent Molecular Dynamics Simulations of Complex Formation between Polycations and Polyanions. Macromolecules 2009. [DOI: 10.1021/ma901632c] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nazish Hoda
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109
| | - Ronald G. Larson
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109
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Landfester K. Miniemulsion polymerization and the structure of polymer and hybrid nanoparticles. Angew Chem Int Ed Engl 2009; 48:4488-507. [PMID: 19455531 DOI: 10.1002/anie.200900723] [Citation(s) in RCA: 478] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The miniemulsion process allows the formation of complex structured polymeric nanoparticles and the encapsulation of a solid or liquid, an inorganic or organic, or a hydrophobic or hydrophilic material into a polymer shell. Many different materials, ranging from organic and inorganic pigments, magnetite, or other solid nanoparticles, to hydrophobic and hydrophilic liquids, such as fragrances, drugs, or photoinitators, can be encapsulated. Functionalization of the nanoparticles can also be easily obtained. Compared to polymerization processes in organic solvents, polymerization to obtain polymeric nanoparticles can be performed in environmentally friendly solvents, usually water.
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Affiliation(s)
- Katharina Landfester
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany.
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POLYELECTROLYTE MICROCAPSULES FABRICATED VIA in situ COACERVATION — THE INFLUENCE OF DOPED POLYELECTROLYTE AMOUNT IN THE TEMPLATES ON THEIR STRUCTURES AND PROPERTIES. ACTA POLYM SIN 2009. [DOI: 10.3724/sp.j.1105.2009.00437] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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48
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Landfester K. Miniemulsionspolymerisation und Struktur von Polymer- und Hybridnanopartikeln. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900723] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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49
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Salim M, Wright PC, McArthur SL. Studies of electroosmotic flow and the effects of protein adsorption in plasma‐polymerized microchannel surfaces. Electrophoresis 2009; 30:1877-87. [DOI: 10.1002/elps.200800619] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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50
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Yu A, Gentle IR, (Max) Lu GQ. Biocompatible polypeptide microcapsules via templating mesoporous silica spheres. J Colloid Interface Sci 2009; 333:341-5. [DOI: 10.1016/j.jcis.2009.01.036] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2008] [Revised: 01/16/2009] [Accepted: 01/16/2009] [Indexed: 11/24/2022]
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