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Pereira JM, Mendes JP, Dias B, Almeida JMMMD, Coelho LCC. Optical pH Sensor Based on a Long-Period Fiber Grating Coated with a Polymeric Layer-by-Layer Electrostatic Self-Assembled Nanofilm. SENSORS (BASEL, SWITZERLAND) 2024; 24:1662. [PMID: 38475198 DOI: 10.3390/s24051662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 02/16/2024] [Accepted: 03/02/2024] [Indexed: 03/14/2024]
Abstract
An optical fiber pH sensor based on a long-period fiber grating (LPFG) is reported. Two oppositely charged polymers, polyethylenimine (PEI) and polyacrylic acid (PAA), were alternately deposited on the sensing structure through a layer-by-layer (LbL) electrostatic self-assembly technique. Since the polymers are pH sensitive, their refractive index (RI) varies when the pH of the solution changes due to swelling/deswelling phenomena. The fabricated multilayer coating retained a similar property, enabling its use in pH-sensing applications. The pH of the PAA dipping solution was tuned so that a coated LPFG achieved a pH sensitivity of (6.3 ± 0.2) nm/pH in the 5.92-9.23 pH range. Only two bilayers of PEI/PAA were used as an overlay, which reduces the fabrication time and increases the reproducibility of the sensor, and its reversibility and repeatability were demonstrated by tracking the resonance band position throughout multiple cycles between different pH solutions. With simulation work and experimental results from a low-finesse Fabry-Perot (FP) cavity on a fiber tip, the coating properties were estimated. When saturated at low pH, it has a thickness of 200 nm and 1.53 ± 0.01 RI, expanding up to 310 nm with a 1.35 ± 0.01 RI at higher pH values, mostly due to the structural changes in the PAA.
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Affiliation(s)
- José M Pereira
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
- Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - João P Mendes
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
| | - Bernardo Dias
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
- Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - José M M M de Almeida
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
- School of Sciences and Technology, University of Trás-os-Montes e Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal
| | - Luís C C Coelho
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
- Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
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Michna A, Pomorska A, Ozcan O. Biocompatible Macroion/Growth Factor Assemblies for Medical Applications. Biomolecules 2023; 13:biom13040609. [PMID: 37189357 DOI: 10.3390/biom13040609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Revised: 03/24/2023] [Accepted: 03/26/2023] [Indexed: 03/31/2023] Open
Abstract
Growth factors are a class of proteins that play a role in the proliferation (the increase in the number of cells resulting from cell division) and differentiation (when a cell undergoes changes in gene expression becoming a more specific type of cell) of cells. They can have both positive (accelerating the normal healing process) and negative effects (causing cancer) on disease progression and have potential applications in gene therapy and wound healing. However, their short half-life, low stability, and susceptibility to degradation by enzymes at body temperature make them easily degradable in vivo. To improve their effectiveness and stability, growth factors require carriers for delivery that protect them from heat, pH changes, and proteolysis. These carriers should also be able to deliver the growth factors to their intended destination. This review focuses on the current scientific literature concerning the physicochemical properties (such as biocompatibility, high affinity for binding growth factors, improved bioactivity and stability of the growth factors, protection from heat, pH changes or appropriate electric charge for growth factor attachment via electrostatic interactions) of macroions, growth factors, and macroion-growth factor assemblies, as well as their potential uses in medicine (e.g., diabetic wound healing, tissue regeneration, and cancer therapy). Specific attention is given to three types of growth factors: vascular endothelial growth factors, human fibroblast growth factors, and neurotrophins, as well as selected biocompatible synthetic macroions (obtained through standard polymerization techniques) and polysaccharides (natural macroions composed of repeating monomeric units of monosaccharides). Understanding the mechanisms by which growth factors bind to potential carriers could lead to more effective delivery methods for these proteins, which are of significant interest in the diagnosis and treatment of neurodegenerative and civilization diseases, as well as in the healing of chronic wounds.
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The pH as a tool to tailor the performance of symmetric and asymmetric layer-by-layer nanofiltration membranes. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.121320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Dolmat M, Kozlovskaya V, Inman D, Thomas C, Kharlampieva E. Hydrogen‐bonded polymer multilayer coatings via dynamic layer‐by‐layer assembly. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20220473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Maksim Dolmat
- Department of Chemistry The University of Alabama at Birmingham Birmingham Alabama USA
| | - Veronika Kozlovskaya
- Department of Chemistry The University of Alabama at Birmingham Birmingham Alabama USA
| | - Daniel Inman
- Department of Chemistry The University of Alabama at Birmingham Birmingham Alabama USA
| | - Claire Thomas
- Department of Chemistry The University of Alabama at Birmingham Birmingham Alabama USA
| | - Eugenia Kharlampieva
- Department of Chemistry The University of Alabama at Birmingham Birmingham Alabama USA
- Center for Nanoscale Materials and Biointegration The University of Alabama at Birmingham Birmingham Alabama USA
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Yuan W, Weng GM, Lipton J, Li CM, Van Tassel PR, Taylor AD. Weak polyelectrolyte-based multilayers via layer-by-layer assembly: Approaches, properties, and applications. Adv Colloid Interface Sci 2020; 282:102200. [PMID: 32585489 DOI: 10.1016/j.cis.2020.102200] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 06/03/2020] [Accepted: 06/11/2020] [Indexed: 10/24/2022]
Abstract
Layer-by-layer (LbL) assembly is a nanoscale technique with great versatility, simplicity and molecular-level processing of various nanoscopic materials. Weak polyelectrolytes have been used as major building blocks for LbL assembly providing a fundamental and versatile tool to study the underlying mechanisms and practical applications of LbL assembly due to its pH-responsive charge density and molecular conformation. Because of high-density uncompensated charges and high-chain mobility, weak polyelectrolyte exponential multilayer growth is considered one of the fastest developing areas for organized molecular films. In this article, we systematically review the current status and developments of weak polyelectrolyte-based multilayers including all-weak-polyelectrolyte multilayers, weak polyelectrolytes/other components (e.g. strong polyelectrolytes, neutral polymers, and nanoparticles) multilayers, and exponentially grown weak polyelectrolyte multilayers. Several key aspects of weak polyelectrolytes are highlighted including the pH-controllable properties, the responsiveness to environmental pH, and synergetic functions obtained from weak polyelectrolyte/other component multilayers. Throughout this review, useful applications of weak polyelectrolyte-based multilayers in drug delivery, tunable biointerfaces, nanoreactors for synthesis of nanostructures, solid state electrolytes, membrane separation, and sensors are highlighted, and promising future directions in the area of weak polyelectrolyte-based multilayer assembly such as fabrication of multi-responsive materials, adoption of unique building blocks, investigation of internal molecular-level structure and mechanism of exponentially grown multilayers, and exploration of novel biomedical and energy applications are proposed.
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Ji CH, Lee SJ, Oh SY. P3HT-based visible-light organic photodetectors using PEI/PAA multilayers as a p-type buffer layer. RSC Adv 2019; 9:37180-37187. [PMID: 35542281 PMCID: PMC9075515 DOI: 10.1039/c9ra08568h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 10/30/2019] [Indexed: 11/27/2022] Open
Abstract
A low leakage current is critical for achieving organic photodetectors (OPDs) with high detectivity. The insertion of buffer layers is an effective approach for reducing the reverse-biased leakage current. In this study, polyelectrolyte multilayers comprising polyethyleneimine (PEI) and polyacrylic acid (PAA) were introduced by a spin-assisted layer-by-layer technique into an OPD as a p-type buffer layer. Although PEI/PAA multilayers are insulators, when used as a buffer layer in our device, they suppressed the leakage current and also provided a high photocurrent due to the light-assisted tunneling effect. The prepared device configuration was ITO/(PEI/PAA)2/P3HT:PC60BM/Yb/Al. The performances of the OPDs were investigated by measuring the current–voltage characteristics, external quantum efficiency, and transient photocurrent. In addition, the operating mechanism of the OPDs was confirmed by impedance analysis. The device comprising (PEI/PAA)2 showed a specific detectivity of 3.11 × 1012 Jones and a bandwidth of 103.2 kHz at −1 V and 525 nm. This performance is a numerical value that can be used in devices such as a line scan camera. In addition, because this device is fabricated by a low-temperature solution process, flexible and large-area substrates can be used. Although PEI/PAA multilayers are insulators, when used as a p-type buffer layer in organic photodetector, they suppressed the leakage current and also provided a high photocurrent due to the light-assisted tunneling effect.![]()
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Affiliation(s)
- Chan Hyuk Ji
- Department of Chemical and Biomolecular Engineering, Sogang University Seoul 04107 Republic of Korea
| | - Seon Ju Lee
- Department of Chemical and Biomolecular Engineering, Sogang University Seoul 04107 Republic of Korea
| | - Se Young Oh
- Department of Chemical and Biomolecular Engineering, Sogang University Seoul 04107 Republic of Korea
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Wang Q, Newby BMZ. Layer-by-layer Polyelectrolytes Coating of Alginate Microgels for Sustained Release of Sodium Benzoate and Zosteric Acid. J Drug Deliv Sci Technol 2018; 46:46-54. [PMID: 30555539 PMCID: PMC6289541 DOI: 10.1016/j.jddst.2018.04.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The potential of sustaining release of very small (Mw < 250 g/mol) hydrophilic drugs up to several days from layer-by-layer (LbL) polyelectrolyte coated alginate microgels (Alg-Ms) was investigated. One purpose is to minimize post-surgical adhesions, which develop in 12 h to 3 days after surgery. The LbL polyelectrolyte layer would serve as a diffusion barrier for their release. The LbL polyelectrolyte bilayers were prepared using poly(allylamine) (PAH) and poly(styrene sulfonate) (PSS). Sodium benzoate (NaB, Mw = 144 g/mol) and zosteric acid (ZA, Mw = 244 g/mol), two anti-inflammatory and anti-microbial compounds, were used as model drugs. A higher number of PAH/PSS bilayer lead to a greater sustained release of both drugs, and with 4 bilayers, the release of NaB and ZA was prolonged from 24 h to 72 h and 120 h, respectively. Fitting the data to the Ritger-Peppas' equation showed that as the bilayer number increased, the release constant and/or exponent decreased, indicating the LbL PAH/PSS bilayer effectively reduced the permeability of these two very small hydrophilic drugs. The ability to prolong the release of such small hydrophilic molecules, which has rarely been investigated previously, would find broad applications in fields such as anti-adhesion treatment and antifouling coatings.
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Affiliation(s)
- Qing Wang
- Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH, 44325-3906, United States
| | - Bi-min Zhang Newby
- Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH, 44325-3906, United States
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Liu W, Wijeratne S, Yang L, Bruening M. Porous star-star polyelectrolyte multilayers for protein binding. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.01.055] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Macroscopic Supramolecular Assembly and Its Applications. CHINESE JOURNAL OF POLYMER SCIENCE 2017. [DOI: 10.1007/s10118-018-2069-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Zheng Z, Ye H, Wang J, Zhang T, You Q, Li H, He R, Chen Y, Zhang W, Cao Y. Visible-light-controllable drug release from multilayer-coated microneedles. J Mater Chem B 2017; 5:7014-7017. [PMID: 32263892 DOI: 10.1039/c7tb01546a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A method for the generation of visible-light-controllable drug release polyelectrolyte multilayers on poly(l-lactide) (PLLA) microneedles is developed by host-guest chemistry. In response to visible light irradiation, model drugs encapsulated on polyelectrolyte multilayers transfer into the skin following brief microneedle application.
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Affiliation(s)
- Zhiqiang Zheng
- Institute for Interdisciplinary Research & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China.
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11
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Fei J, Zhang H, Wang A, Qin C, Xue H, Li J. Biofluid-Triggered Burst Release from an Adaptive Covalently Assembled Dipeptide Nanocontainer for Emergency Treatment. Adv Healthc Mater 2017; 6. [PMID: 28177202 DOI: 10.1002/adhm.201601198] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 01/09/2017] [Indexed: 11/09/2022]
Abstract
The construction of quickly dissociating containers holding bioactive components that meet the extreme requirements of emergency treatment is highly desirable but remains a great challenge. Here the use of small-molecule-induced dynamic covalent assembly is reported for simple and tunable fabrication of a biocompatible diphenylalanine-based nanocontainer toward rapidly responsive cargo delivery. The assembled nanocontainer can adaptively encapsulate various charged or neutral molecules. Upon biofluid trigger, the encapsulated molecules and bioactive proteins are released in a burst (within 5 s) from the nanocontainer due to highly sensitive deprotonation-mediated disruption of hydrogen bonding. This highlighted feature allows the nanocontainer as an excellent "fast dissolving" delivery vehicle available in spray dosage form for medical emergencies, as demonstrated by in vivo application for massive hemorrhage.
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Affiliation(s)
- Jinbo Fei
- Beijing National Laboratory for Molecular Sciences; CAS Key Lab of Colloid; Interface and Chemical Thermodynamics; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - He Zhang
- Beijing National Laboratory for Molecular Sciences; CAS Key Lab of Colloid; Interface and Chemical Thermodynamics; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- School of Chemistry and Chemical Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Anhe Wang
- National Center for Nanoscience and Technology; Beijing 100190 China
| | - Chenchen Qin
- Beijing National Laboratory for Molecular Sciences; CAS Key Lab of Colloid; Interface and Chemical Thermodynamics; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- School of Chemistry and Chemical Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Huimin Xue
- Beijing National Laboratory for Molecular Sciences; CAS Key Lab of Colloid; Interface and Chemical Thermodynamics; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- School of Chemistry and Chemical Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
| | - Junbai Li
- Beijing National Laboratory for Molecular Sciences; CAS Key Lab of Colloid; Interface and Chemical Thermodynamics; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- School of Chemistry and Chemical Engineering; University of Chinese Academy of Sciences; Beijing 100049 China
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12
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Mane S, Ponrathnam S, Chavan N. Crosslinked polymer embedded Cu/Ag for comparative drug adsorption and kinetics evaluation. INT J POLYM MATER PO 2016. [DOI: 10.1080/00914037.2015.1119684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Chen XC, Ren KF, Chen JY, Wang J, Zhang H, Ji J. Self-wrinkling polyelectrolyte multilayers: construction, smoothing and the underlying mechanism. Phys Chem Chem Phys 2016; 18:31168-31174. [DOI: 10.1039/c6cp05419f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The spontaneous formation of these surface features can be attributed to swelling-induced film deformation during the assembling process.
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Affiliation(s)
- Xia-chao Chen
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Ke-feng Ren
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Jia-yan Chen
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Jing Wang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - He Zhang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Jian Ji
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou
- China
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14
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Laskar P, Saha B, Ghosh SK, Dey J. PEG based random copolymer micelles as drug carriers: the effect of hydrophobe content on drug solubilization and cytotoxicity. RSC Adv 2015. [DOI: 10.1039/c4ra11479e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The effect of hydrophobe content on PEG based random polymeric micelles as drug carriers: a comparative study.
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Affiliation(s)
- Partha Laskar
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur-721 302
- India
| | - Biswajit Saha
- Department of Biotechnology
- Indian Institute of Technology
- Kharagpur-721 302
- India
| | - Sudip Kumar Ghosh
- Department of Biotechnology
- Indian Institute of Technology
- Kharagpur-721 302
- India
| | - Joykrishna Dey
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur-721 302
- India
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Li W, Xu D, Hu Y, Cai K, Lin Y. Surface modification of titanium substrates with silver nanoparticles embedded sulfhydrylated chitosan/gelatin polyelectrolyte multilayer films for antibacterial application. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:1435-1448. [PMID: 24664672 DOI: 10.1007/s10856-014-5190-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Accepted: 03/08/2014] [Indexed: 06/03/2023]
Abstract
To develop Ti implants with potent antibacterial activity, a novel "sandwich-type" structure of sulfhydrylated chitosan (Chi-SH)/gelatin (Gel) polyelectrolyte multilayer films embedding silver (Ag) nanoparticles was coated onto titanium substrate using a spin-assisted layer-by-layer assembly technique. Ag ions would be enriched in the polyelectrolyte multilayer films via the specific interactions between Ag ions and -HS groups in Chi-HS, thus leading to the formation of Ag nanoparticles in situ by photo-catalytic reaction (ultraviolet irradiation). Contact angle measurement and field emission scanning electron microscopy equipped with energy dispersive X-ray spectroscopy were employed to monitor the construction of Ag-containing multilayer on titanium surface, respectively. The functional multilayered films on titanium substrate [Ti/PEI/(Gel/Chi-SH/Ag) n /Gel] could efficiently inhibit the growth and activity of Bacillus subtitles and Escherichia coli onto titanium surface. Moreover, studies in vitro confirmed that Ti substrates coating with functional multilayer films remained the biological functions of osteoblasts, which was reflected by cell morphology, cell viability and ALP activity measurements. This study provides a simple, versatile and generalized methodology to design functional titanium implants with good cyto-compatibility and antibacterial activity for potential clinical applications.
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Affiliation(s)
- Wen Li
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400044, People's Republic of China
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Cheng M, Jiang C, Ding Z, Zhang Y, Fu Y, Shi F. Layer-by-layer self-assembly and disassembly of single charged inorganic small molecules: towards surface patterning. Phys Chem Chem Phys 2014; 15:15172-6. [PMID: 23925457 DOI: 10.1039/c3cp52217b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The patterning of layer-by-layer (LbL) polyelectrolyte multilayers with metal ions is important for the facile fabrication of circuits or selective catalysis. The strategy includes two issues: the incorporation of metal ions and their controlled assembly-disassembly, which require a good understanding of the assembly mechanism. Therefore, we explored the LbL assembly between a polycation, poly-(diallyldimethylammonium chloride) (PDDA) and an inorganic single charged molecule, [AuCl4](-), which could assemble at pH = 3.7 and disassemble at lower pH values. Moreover, we have demonstrated that the driving force in the assembly is a ligand-to-metal charge transfer interaction. Combining the controlled assembly-disassembly of PDDA-[AuCl4](-) multilayers and photolithography, we obtained a surface pattern of PDDA-[AuCl4](-) multilayers.
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Affiliation(s)
- Mengjiao Cheng
- State Key Laboratory of Chemical Resource Engineering & Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
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18
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Zhu H, Zhang M, Cai S, Cai Y, Wang P, Bao S, Zou M, Du M. Insitu growth of Rh nanoparticles with controlled sizes and dispersions on the cross-linked PVA–PEI nanofibers and their electrocatalytic properties towards H2O2. RSC Adv 2014. [DOI: 10.1039/c3ra44834g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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Li J, Zhang X, Chen S, You Q, He R, Shi J, Cao Y, Chen Y. Multi-responsive drug release from hydrogen-bonding multilayers containing PEGylated nanoparticles and azobenzenes. J Mater Chem B 2014; 2:4422-4425. [DOI: 10.1039/c3tb21651a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the design of a platform that is assembled within hydrogen-bonding nanoparticle/azobenzene multilayer films for multi-responsive drug release.
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Affiliation(s)
- Jin Li
- Institute for Interdisciplinary Research & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education
- Jianghan University
- Wuhan 430056, China
| | - Xiaoyong Zhang
- Institute for Interdisciplinary Research & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education
- Jianghan University
- Wuhan 430056, China
| | - Shengqiu Chen
- Institute for Interdisciplinary Research & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education
- Jianghan University
- Wuhan 430056, China
| | - Qingliang You
- Institute for Interdisciplinary Research & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education
- Jianghan University
- Wuhan 430056, China
| | - Rongxiang He
- Institute for Interdisciplinary Research & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education
- Jianghan University
- Wuhan 430056, China
| | - Jian Shi
- Institute for Interdisciplinary Research & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education
- Jianghan University
- Wuhan 430056, China
| | - Yiping Cao
- Institute for Interdisciplinary Research & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education
- Jianghan University
- Wuhan 430056, China
| | - Yong Chen
- Institute for Interdisciplinary Research & Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education
- Jianghan University
- Wuhan 430056, China
- Département de Chimie
- Ecole Normale Supérieure
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Wijeratne S, Bruening ML, Baker GL. Layer-by-layer assembly of thick, Cu(2+)-chelating films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:12720-9. [PMID: 24044576 PMCID: PMC3873220 DOI: 10.1021/la402633x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Layer-by-layer adsorption of protonated poly(allylamine) (PAH) and deprotonated poly(N,N-dicarboxymethylallylamine) (PDCMAA) yields thick films with a high density of iminodiacetic acid (IDA) ligands that bind metal ions. When film deposition occurs at pH 3.0, PAH/PDCMAA bilayer thicknesses reach 200 nm, and Cu(2+) binding capacities are ~2.5 mmol per cm(3) of film. (PAH/PDCMAA)10 films deposited at pH 3.0 are 4-8-fold thicker than films formed at pH 5.0, 7.0, or 9.0, presumably because of the low charge density on PDCMAA chains at pH 3.0. However, with normalization to film thickness, all films bind similar amounts of Cu(2+) from pH 4.1 solutions of CuSO4. In micrometer-thick films, equilibration of binding sites with Cu(2+) requires ~4 h due to a low Cu(2+) diffusion coefficient (~2.6 × 10(-12) cm(2)/s). Sorption isotherms determined at several temperatures show that Cu(2+) binding is endothermic with a positive entropy (binding constants increase with increasing temperature), presumably because metal-ion complexation involves displacement of both a proton from IDA and water molecules from Cu(2+). (PAH/PDCMAA)10 films retain their binding capacity over four absorption/elution cycles and may prove useful in metal-ion scavenging, catalysis, and protein binding.
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Affiliation(s)
- Salinda Wijeratne
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - Merlin L. Bruening
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
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Aw MS, Losic D. Ultrasound enhanced release of therapeutics from drug-releasing implants based on titania nanotube arrays. Int J Pharm 2013; 443:154-62. [DOI: 10.1016/j.ijpharm.2013.01.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 12/15/2012] [Accepted: 01/02/2013] [Indexed: 12/27/2022]
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Yuan W, Lu Z, Liu J, Wang H, Li CM. ZnO nanowire array-templated LbL self-assembled polyelectrolyte nanotube arrays and application for charged drug delivery. NANOTECHNOLOGY 2013; 24:045605. [PMID: 23299408 DOI: 10.1088/0957-4484/24/4/045605] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Vertically oriented and robust polyelectrolyte nanotube arrays with high density, large area and high uniformity were successfully grown on substrates by a ZnO nanowire array-templated layer-by-layer (LbL) self-assembly approach for the first time, and were further used to deliver charged drugs, showing that they not only possess pH-responsive loading property, but also significantly enhance the loading capacity and sustained release time. This work could be extended to fabricate polyelectrolyte nanotube arrays with different polyelectrolyte combinations, including weak polyelectrolyte/weak polyelectrolyte, weak polyelectrolyte/strong polyelectrolyte and strong polyelectrolyte/strong polyelectrolyte. With the great versatility to use various substrates and building blocks, the polyelectrolyte nanotube arrays may have great potential for broad applications such as biosensor arrays, bioreactor arrays and optoelectronics.
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Affiliation(s)
- Weiyong Yuan
- Institute for Clean Energy and Advanced Materials, Southwest University, Chongqing 400715, People's Republic of China
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Yuan W, Lu Z, Wang H, Li CM. Sacrificial polymer thin-film template with tunability to construct high-density Au nanoparticle arrays and their refractive index sensing. Phys Chem Chem Phys 2013; 15:15499-507. [DOI: 10.1039/c3cp52816b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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