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López-Escalante MC, Martínez de Yuso MV, Cuevas AL, Benavente J. Optical Modification of a Nanoporous Alumina Structure Associated with Surface Coverage by the Ionic Liquid AliquatCl. MICROMACHINES 2024; 15:739. [PMID: 38930709 PMCID: PMC11206012 DOI: 10.3390/mi15060739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 05/26/2024] [Accepted: 05/29/2024] [Indexed: 06/28/2024]
Abstract
This manuscript analyses changes in the optical parameters of a commercial alumina nanoporous structure (AnodiscTM or AND support) due to surface coverage by the ionic liquid (IL) AliquatCl (AlqCl). XPS measurements were performed for chemical characterization of the composite AND/AlqCl and the AND support, but XPS resolved angle analysis (from 15° to 75°) was carried out for the homogeneity estimation of the top surface of the ANDAlqCl sample. Optical characterization of both the composite AND/AlqCl and the AND support was performed by three non-destructive and non-invasive techniques: ellipsometry spectroscopy (SE), light transmittance/reflection, and photoluminescence. SE measurements (wavelength ranging from 250 nm to 1250 nm) allow for the determination of the refraction index of the AND/AlqCl sample, which hardly differs from that corresponding to the IL, confirming the XPS results. The presence of the IL significantly increases the light transmission of the alumina support in the visible region and reduces reflection, affecting also the maximum position of this latter curve, as well as the photoluminescence spectra. Due to these results, illuminated I-V curves for both the composite AND/AlqCl film and the AND support were also measured to estimate its possible application as a solar cell. The optical behaviour exhibited by the AND/AlqCl thin film in the visible region could be of interest for different applications.
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Affiliation(s)
- María Cruz López-Escalante
- The Nanotech Unit, Laboratorio de Materiales y Superficies, Departamento de Ingeniería Química, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain;
| | - Mª Valle Martínez de Yuso
- Laboratorio de Espectroscopía de Rayos X, Servicios Centrales de Apoyo a la Investigación (SCAI), Universidad de Málaga, 29071 Málaga, Spain;
| | - Ana L. Cuevas
- Unidad de Nanotecnología, Servicios Centrales de Apoyo a la Investigación (SCAI), Universidad de Málaga, 29071 Málaga, Spain;
| | - Juana Benavente
- Departamento de Física Aplicada I, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
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2
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Wang Y, Zhou J, Zheng T, Li L, Zhu M. Adsorption Kinetics of Poly(benzyl acrylate) Chains onto Alumina Interface during the Flow-Driven Translocation through Cylindrical Nanochannels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:13303-13315. [PMID: 37669096 DOI: 10.1021/acs.langmuir.3c01913] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/06/2023]
Abstract
In this work, the adsorption kinetics of the PBAN/AAO system under flushing condition has been investigated, where PBAN and AAO represent poly(benzyl acrylate) and anodic alumina oxide (AAO, average pore radius R0 ≈ 10 nm) nanochannel, respectively. Our specially designed double-pump flushing system is proved to eliminate the overshoot phenomenon and in situ monitor transmembrane pressure (ΔP) as a function of flushing time (t) and flow rate (Q), which gives the effective pore radius (R), cross-sectional coverage factor (χ = [1 - (R/R0)2]), and characteristic ratio (rc) of the increments of χ during each adsorption/desorption cycle at a given bulk solution concentration (Cbulk). Our findings include: (1) by gradient increasing Cbulk from 10 to 200 mg/L at Q = 10 mL/h, the shortest PBA40 displays a saturation adsorption behavior when Cbulk ≥ 80 mg/L and t ≥ 2000 s, which agrees well with the prediction of blob model, whereas for the longer PBAN chains, the chain length (N) and concentration-dependent adsorption tendency get stronger as N increases from 40 to 620 at t ≥ 2000 s, in particular, R/R0 ∼ N-0.20 is observed at Cbulk = 140 mg/L; (2) by focusing on the platform χ in the saturation adsorption regime (χsat), the longer PBAN displays a stronger adsorption trend with partially reversible feature at Q = 5.0 mL/h, namely, as N increases from 40 to 620, χsat increases from 0.15 to 0.83 at Cbulk = 100 mg/L, where rc changes from 0.25 ± 0.10 to 0.80 ± 0.10 as the adsorption/desorption flushing cycle increases from 1 to 8 at Cbulk = 100 mg/L; (3) by further assuming a solvent nonpenetrating and nondraining adsorption layer, χsat determined in the case of curved surface can be comparable to the physical meaning of adsorption thickness (Δad) in the case of flat-surface adsorption, and the fitting result indicates χsat ∼ Δad ∼ N0.58, falling between Δad ∼ N1/2 and Δad ∼ N1.0 predicted by the mean-field and scaling theories for real multichain adsorption, respectively. Overall, the present work not only clarifies some controversies but also provides unambiguous evidence supporting the existence of tightly adsorbed internal and loosely adsorbed external layers.
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Affiliation(s)
- Yiren Wang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Jianing Zhou
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Tao Zheng
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Lianwei Li
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Mo Zhu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
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3
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Ahn J, Ryu T, Park J. Composite membranes with ultrathin and conformal passivation for universal microfiltration compatible with organic solvents. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Zhang Z, Wang S, Yang Y, Li W, Liu P, Wang WJ. Hierarchical Assembly of Two-Dimensional Polymers into Colloidosomes and Microcapsules. ACS Macro Lett 2021; 10:933-939. [PMID: 35549182 DOI: 10.1021/acsmacrolett.1c00380] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Hierarchical assembly of two-dimensional (2D) polymers to 3D microstructures provides new means of creating functional materials with exotic properties for extensive applications. Herein, we report an approach of assembling 2D covalent organic framework (COF) colloidosomes or microcapsules from small molecules. We polymerized monomers to produce narrowly distributed COF particles with average particle sizes greater than 490 nm, which were further used as stabilizers to prepare various water-in-oil Pickering emulsions with droplet sizes of 10-120 μm on average. The emulsion droplets were subsequently applied as templates for interfacial polymerization of the same monomers. The COF microcapsules with varied diameters and shell thicknesses of 0.2-3.1 μm were thus obtained, which possessed good stability, high crystallinity, and surface areas no less than 540 m2/g. The approach also permits facile loading of water-soluble substances such as salts, dyes, or proteins. The loaded molecules demonstrated different permeability against the shell, in which 98% of the encapsulated salts could be released in 1 h while only 18% of dye molecules and almost none of the fluorescent proteins diffused out from the microcapsules. Such an assembling approach may greatly extend the applications of 2D polymers and their microcapsules.
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Affiliation(s)
- Ziyang Zhang
- State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Song Wang
- State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yuhao Yang
- State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Wei Li
- State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Pingwei Liu
- State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
- Institute of Zhejiang University - Quzhou, 78 Jiuhua Boulevard North, Quzhou 324000, China
| | - Wen-Jun Wang
- State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
- Institute of Zhejiang University - Quzhou, 78 Jiuhua Boulevard North, Quzhou 324000, China
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5
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Arafa IM, Shatnawi MY, Abdallah MH, Algharaibeh ZA. Grafting of glycine, alanine, serine, and threonine on cellulose membranes and their role in regulating the uniport, symport, and antiport permeation of glucose. INT J POLYM MATER PO 2020. [DOI: 10.1080/00914037.2020.1785459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Isam M. Arafa
- Department of Applied Chemistry, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, Jordan
| | - Mazin Y. Shatnawi
- Department of Applied Chemistry, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, Jordan
| | - Mohammad H. Abdallah
- Department of Applied Chemistry, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, Jordan
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Cleri F. Agent-based model of multicellular tumor spheroid evolution including cell metabolism. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2019; 42:112. [PMID: 31456065 DOI: 10.1140/epje/i2019-11878-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 07/29/2019] [Indexed: 06/10/2023]
Abstract
Computational models aiming at the spatio-temporal description of cancer evolution are a suitable framework for testing biological hypotheses from experimental data, and generating new ones. Building on our recent work (J. Theor. Biol. 389, 146 (2016)) we develop a 3D agent-based model, capable of tracking hundreds of thousands of interacting cells, over time scales ranging from seconds to years. Cell dynamics is driven by a Monte Carlo solver, incorporating partial differential equations to describe chemical pathways and the activation/repression of "genes", leading to the up- or down-regulation of specific cell markers. Each cell-agent of different kind (stem, cancer, stromal etc.) runs through its cycle, undergoes division, can exit to a dormant, senescent, necrotic state, or apoptosis, according to the inputs from its systemic network. The basic network at this stage describes glucose/oxygen/ATP cycling, and can be readily extended to cancer-cell specific markers. Eventual accumulation of chemical/radiation damage to each cell's DNA is described by a Markov chain of internal states, and by a damage-repair network, whose evolution is linked to the cell systemic network. Aimed at a direct comparison with experiments of tumorsphere growth from stem cells, the present model will allow to quantitatively study the role of transcription factors involved in the reprogramming and variable radio-resistance of simulated cancer-stem cells, evolving in a realistic computer simulation of a growing multicellular tumorsphere.
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Affiliation(s)
- Fabrizio Cleri
- Institut d'Electronique, Microélectronique et Nanotechnologie (IEMN, UMR Cnrs 8520), 59652, Villeneuve d'Ascq, France.
- Departement de Physique, Université de Lille, 59650, Villeneuve d'Ascq, France.
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7
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An Effective Electric Dipole Model for Voltage-induced Gating Mechanism of Lysenin. Sci Rep 2019; 9:11440. [PMID: 31391571 PMCID: PMC6686002 DOI: 10.1038/s41598-019-47725-0] [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: 07/19/2018] [Accepted: 07/08/2019] [Indexed: 11/30/2022] Open
Abstract
Lysenin is a pore-forming toxin, which self-inserts open channels into sphingomyelin containing membranes and is known to be voltage regulated. The mechanistic details of its voltage gating mechanism, however, remains elusive despite much recent efforts. Here, we have employed a novel combination of experimental and computational techniques to examine a model for voltage gating, that is based on the existence of an “effective electric dipole” inspired by recent reported structures of lysenin. We support this mechanism by the observations that (i) the charge-reversal and neutralization substitutions in lysenin result in changing its electrical gating properties by modifying the strength of the dipole, and (ii) an increase in the viscosity of the solvent increases the drag force and slows down the gating. In addition, our molecular dynamics (MD) simulations of membrane-embedded lysenin provide a mechanistic picture for lysenin conformational changes, which reveals, for the first time, the existence of a lipid-dependent bulge region in the pore-forming module of lysenin, which may explain the gating mechanism of lysenin at a molecular level.
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8
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Di Silvio D, Silvestri A, Lay L, Polito L, Moya SE. Impact of ConcanavalinA affinity in the intracellular fate of Protein Corona on Glucosamine Au nanoparticles. Sci Rep 2018; 8:9046. [PMID: 29899359 PMCID: PMC5998083 DOI: 10.1038/s41598-018-27418-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 05/25/2018] [Indexed: 01/12/2023] Open
Abstract
Biological fate and toxicity of nanoparticles (NPs) are connected to the interaction between NPs and the protein corona (PC) spontaneously forming around NPs in biological matrixes. PC is a dynamic entity that confers biological identity to NPs. In this work, fluorescence cross-correlation spectroscopy (FCCS) is used to study the impact of specific interactions between the NP surface and proteins on the intracellular fate of PC. The stability of the PC formed around glucosamide-functionalized Au-NPs from ConcanavalinA (ConA) or Bovine Serum Albumin (BSA) is characterized by FCCS. The NPs show higher affinity for ConA and competitive assays show that ConA easily exchanges BSA. A549 cells are exposed to glucosamide-functionalized Au-NPs with preformed ConA and BSA PCs. Intracellularly the frequency of cross-correlation for Au NPs with ConA PC remains constant to a 70% value until 24 h while for BSA it decreases to a 15% during the same period. FCCS measurements in several locations in the cell point out a different level of aggregation for the NPs with either ConA or BSA PCs. Our results show that the affinity of NPs functionalized with a ligand with affinity for a specific protein in bulk is retained intracellularly influencing NP fate and translocation.
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Affiliation(s)
- Desirè Di Silvio
- Soft Matter Nanotechnology Group, CIC biomaGUNE, Paseo Miramon, 182, 20014, San Sebastian, Spain
| | - Alessandro Silvestri
- CNR - ISTM, Nanotechnology Lab., Via G. Fantoli 16/15, Milan, Italy
- Department of Chemistry, University of Milan, Via C. Golgi 19, Milan, Italy
- Max-Planck Institute of Colloids and Interfaces, Potsdam-Golm, 14476, Germany
| | - Luigi Lay
- Department of Chemistry, University of Milan, Via C. Golgi 19, Milan, Italy
- CRC Materiali Polimerici (LaMPo), University of Milan, Via C. Golgi 19, 20133, Milan, Italy
| | - Laura Polito
- CNR - ISTM, Nanotechnology Lab., Via G. Fantoli 16/15, 20138, Milan, Italy
| | - Sergio E Moya
- Soft Matter Nanotechnology Group, CIC biomaGUNE, Paseo Miramon, 182, 20014, San Sebastian, Spain.
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9
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Vega V, Gelde L, González A, Prida V, Hernando B, Benavente J. Diffusive transport through surface functionalized nanoporous alumina membranes by atomic layer deposition of metal oxides. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.03.025] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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10
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Theuer L, Lehmann M, Junne S, Neubauer P, Birkholz M. Micro-Electromechanical Affinity Sensor for the Monitoring of Glucose in Bioprocess Media. Int J Mol Sci 2017; 18:E1235. [PMID: 28594350 PMCID: PMC5486058 DOI: 10.3390/ijms18061235] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 04/23/2017] [Accepted: 05/31/2017] [Indexed: 12/03/2022] Open
Abstract
An affinity-viscometry-based micro-sensor probe for continuous glucose monitoring was investigated with respect to its suitability for bioprocesses. The sensor operates with glucose and dextran competing as binding partner for concanavalin A, while the viscosity of the assay scales with glucose concentration. Changes in viscosity are determined with a micro-electromechanical system (MEMS) in the measurement cavity of the sensor probe. The study aimed to elucidate the interactions between the assay and a typical phosphate buffered bacterial cultivation medium. It turned out that contact with the medium resulted in a significant long-lasting drift of the assay's viscosity at zero glucose concentration. Adding glucose to the medium lowers the drift by a factor of eight. The cglc values measured off-line with the glucose sensor for monitoring of a bacterial cultivation were similar to the measurements with an enzymatic assay with a difference of less than ±0.15 g·L-1. We propose that lectin agglomeration, the electro-viscous effect, and constitutional changes of concanavalin A due to exchanges of the incorporated metal ions may account for the observed viscosity increase. The study has demonstrated the potential of the MEMS sensor to determine sensitive viscosity changes within very small sample volumes, which could be of interest for various biotechnological applications.
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Affiliation(s)
- Lorenz Theuer
- Chair of Bioprocess Engineering, Department of Biotechnology, Technical University Berlin, ACK24, Ackerstr. 76, 13355 Berlin, Germany.
| | - Micha Lehmann
- Chair of Bioprocess Engineering, Department of Biotechnology, Technical University Berlin, ACK24, Ackerstr. 76, 13355 Berlin, Germany.
| | - Stefan Junne
- Chair of Bioprocess Engineering, Department of Biotechnology, Technical University Berlin, ACK24, Ackerstr. 76, 13355 Berlin, Germany.
| | - Peter Neubauer
- Chair of Bioprocess Engineering, Department of Biotechnology, Technical University Berlin, ACK24, Ackerstr. 76, 13355 Berlin, Germany.
| | - Mario Birkholz
- IHP, Im Technologiepark 25, 15236 Frankfurt (Oder), Germany.
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11
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Stine KJ. Application of Porous Materials to Carbohydrate Chemistry and Glycoscience. Adv Carbohydr Chem Biochem 2017; 74:61-136. [PMID: 29173727 DOI: 10.1016/bs.accb.2017.10.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
There is a growing interest in using a range of porous materials to meet research needs in carbohydrate chemistry and glycoscience in general. Among the applications of porous materials reviewed in this chapter, enrichment of glycans from biological samples prior to separation and analysis by mass spectrometry is a major emphasis. Porous materials offer high surface area, adjustable pore sizes, and tunable surface chemistry for interacting with glycans, by boronate affinity, hydrophilic interactions, molecular imprinting, and polar interactions. Among the materials covered in this review are mesoporous silica and related materials, porous graphitic carbon, mesoporous carbon, porous polymers, and nanoporous gold. In some applications, glycans are enzymatically or chemically released from glycoproteins or glycopeptides, and the porous materials have the advantage of size selectivity admitting only the glycans into the pores and excluding proteins. Immobilization of lectins onto porous materials of suitable pore size allows for the use of lectin-carbohydrate interactions in capture or separation of glycoproteins. Porous material surfaces modified with carbohydrates can be used for the selective capture of lectins. Controlled release of therapeutics from porous materials mediated by glycans has been reported, and so has therapeutic targeting using carbohydrate-modified porous particles. Additional applications of porous materials in glycoscience include their use in the supported synthesis of oligosaccharides and in the development of biosensors for glycans.
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12
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Chaturvedi P, Rodriguez SD, Vlassiouk I, Hansen IA, Smirnov SN. Simple and Versatile Detection of Viruses Using Anodized Alumina Membranes. ACS Sens 2016; 1:488-492. [PMID: 28529972 DOI: 10.1021/acssensors.6b00003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A simple sensor for viral particles based on ionic conductivity through anodized alumina membranes was demonstrated using MS2 bacteriophage as an example. A facile two-point measuring scheme is geared toward realization using a computer's sound card input/output capabilities suitable for a fast and inexpensive point of care testing. The lowest detection concentration down to ~7 pfu/mL and a large dynamic range up to ~2000 pfu/mL were obtained due to physical optimization that included proper length and diameter for the pores, removing the oxide layer at the electrode, as well as the chemical optimization of covalent binding of antibodies to the pore's walls.
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Affiliation(s)
| | | | - Ivan Vlassiouk
- Oak Ridge National Laboratory, Oak
Ridge, Tennessee 37831, United States
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14
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Tong J, Xu X, Wang H, Zhuang X, Zhang F. Solution-blown core–shell hydrogel nanofibers for bovine serum albumin affinity adsorption. RSC Adv 2015. [DOI: 10.1039/c5ra19420b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this work, nylon 6 core–chitosan/poly(vinyl alcohol) (PVA) shell hydrogel nanofibers (NCNFs) were fabricated by coaxial solution blowing for BSA adsorbing.
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Affiliation(s)
- Junying Tong
- College of Textile
- Tianjin Polytechnic University
- Tianjin 300387
- P.R.China
| | - Xianlin Xu
- College of Textile
- Tianjin Polytechnic University
- Tianjin 300387
- P.R.China
| | - Hang Wang
- College of Textile
- Tianjin Polytechnic University
- Tianjin 300387
- P.R.China
| | - Xupin Zhuang
- College of Textile
- Tianjin Polytechnic University
- Tianjin 300387
- P.R.China
- Key Laboratory of Advanced Textile Composite Materials of Ministry of Education
| | - Fang Zhang
- College of Textile
- Tianjin Polytechnic University
- Tianjin 300387
- P.R.China
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15
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Wang N, Burugapalli K, Wijesuriya S, Far MY, Song W, Moussy F, Zheng Y, Ma Y, Wu Z, Li K. Electrospun polyurethane-core and gelatin-shell coaxial fibre coatings for miniature implantable biosensors. Biofabrication 2014; 6:015002. [PMID: 24346001 PMCID: PMC3969240 DOI: 10.1088/1758-5082/6/1/015002] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The aim of this study was to introduce bioactivity to the electrospun coating for implantable glucose biosensors. Coaxial fibre membranes having polyurethane as the core and gelatin as the shell were produced using a range of polyurethane concentrations (2, 4, 6 and 8% wt/v) while keeping gelatin concentration (10% wt/v) constant in 2,2,2-trifluoroethanol. The gelatin shell was stabilized using glutaraldehyde vapour. The formation of core-shell structure was confirmed using transmission/scanning electron microscopy and FTIR. The coaxial fibre membranes showed uniaxial tensile properties intermediate to that of the pure polyurethane and the gelatin fibre membranes. The gelatin shell increased hydrophilicity and glucose transport flux across the coaxial fibre membranes. The coaxial fibre membranes having small fibre diameter (541 nm) and a thick gelatin shell (52%) did not affect the sensor sensitivity, but decreased sensor's linearity in the long run. In contrast, thicker coaxial fibre membranes (1133 nm) having a thin gelatin shell (34%) maintained both sensitivity and linearity for the 84 days of the study period. To conclude, polyurethane-gelatin coaxial fibre membranes, due to their faster permeability to glucose, tailorable mechanical properties and bioactivity, are potential candidates for coatings to favourably modify the host responses to extend the reliable in vivo lifetime of implantable glucose biosensors.
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Affiliation(s)
- Ning Wang
- Brunel Institute for Bioengineering, Brunel University, Uxbridge, London, UK
| | - Krishna Burugapalli
- Brunel Institute for Bioengineering, Brunel University, Uxbridge, London, UK
| | - Shavini Wijesuriya
- Brunel Institute for Bioengineering, Brunel University, Uxbridge, London, UK
| | - Mahshid Yazdi Far
- Wolfson Centre for Materials Processing, Brunel University, Uxbridge, London, UK
| | - Wenhui Song
- Wolfson Centre for Materials Processing, Brunel University, Uxbridge, London, UK
| | - Francis Moussy
- Brunel Institute for Bioengineering, Brunel University, Uxbridge, London, UK
| | - Yudong Zheng
- School of Materials Science & Engineering, University of Science and Technology Beijing, China
| | - Yanxuan Ma
- School of Materials Science & Engineering, University of Science and Technology Beijing, China
| | - Zhentao Wu
- Department of Chemical Engineering, Imperial College, London, UK
| | - Kang Li
- Department of Chemical Engineering, Imperial College, London, UK
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16
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Uehara H, Kano M, Tanaka H, Kato S, Masunaga H, Yamanobe T. Nanoporous morphology control of polyethylene membranes by block copolymer blends. RSC Adv 2014. [DOI: 10.1039/c4ra01676a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A desirable combination of size-selective molecular permeation and robustness development for nanoporous membranes could be achieved via pore geometry control by a blending technique.
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Affiliation(s)
- Hiroki Uehara
- Division of Molecular Science
- Faculty of Science and Technology
- Gunma University
- Kiryu, Japan
| | - Makiko Kano
- Division of Molecular Science
- Faculty of Science and Technology
- Gunma University
- Kiryu, Japan
| | - Hidekazu Tanaka
- Division of Molecular Science
- Faculty of Science and Technology
- Gunma University
- Kiryu, Japan
| | - Satomi Kato
- Division of Molecular Science
- Faculty of Science and Technology
- Gunma University
- Kiryu, Japan
| | | | - Takeshi Yamanobe
- Division of Molecular Science
- Faculty of Science and Technology
- Gunma University
- Kiryu, Japan
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17
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Wang N, Burugapalli K, Song W, Halls J, Moussy F, Zheng Y, Ma Y, Wu Z, Li K. Tailored fibro-porous structure of electrospun polyurethane membranes, their size-dependent properties and trans-membrane glucose diffusion. J Memb Sci 2013; 427:207-217. [PMID: 23170040 PMCID: PMC3500561 DOI: 10.1016/j.memsci.2012.09.052] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The aim of this study was to develop polyurethane (PU) based fibro-porous membranes and to investigate the size-effect of hierarchical porous structure on permeability and surface properties of the developed electrospun membranes. Non-woven Selectophore™ PU membranes having tailored fibre diameters, pore sizes, and thickness were spun using electrospinning, and their chemical, physical and glucose permeability properties were characterised. Solvents, solution concentration, applied voltage, flow rate and distance to collector, each were systematically investigated, and electrospinning conditions for tailoring fibre diameters were identified. Membranes having average fibre diameters - 347, 738 and 1102 nm were characterized, revealing average pore sizes of 800, 870 and 1060 nm and pore volumes of 44, 63 and 68% respectively. Hydrophobicity increased with increasing fibre diameter and porosity. Effective diffusion coefficients for glucose transport across the electrospun membranes varied as a function of thickness and porosity, indicating high flux rates for mass transport. Electrospun PU membranes having significantly high pore volumes, extensively interconnected porosity and tailorable properties compared to conventional solvent cast membranes can find applications as coatings for sensors requiring analyte exchange.
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Affiliation(s)
- Ning Wang
- Brunel Institute for Bioengineering, Brunel University, Uxbridge, London, UK
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