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Xia Y, Dong X, Chang H, Zhang X, Li J, Wang S, Lu Y, Yue T. Fabrication of an Antifouling Surface Plasmon Resonance Sensor with Stratified Zwitterionic Peptides for Highly Efficient Detection of Peanut Allergens in Biscuits. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:11259-11267. [PMID: 38691423 DOI: 10.1021/acs.jafc.4c01665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
Peanut allergen monitoring is currently an effective strategy to avoid allergic diseases, while food matrix interference is a critical challenge during detection. Here, we developed an antifouling surface plasmon resonance sensor (SPR) with stratified zwitterionic peptides, which provides both excellent antifouling and sensing properties. The antifouling performance was measured by the SPR, which showed that stratified peptide coatings showed much better protein resistance, reaching ultralow adsorption levels (<5 ng/cm2). Atomic force microscopy was used to further analyze the antifouling mechanism from a mechanical perspective, which demonstrated lower adsorption forces on hybrid peptide coatings, confirming the better antifouling performance of stratified surfaces. Moreover, the recognition of peanut allergens in biscuits was performed using an SPR with high efficiency and appropriate recovery results (98.2-112%), which verified the feasibility of this assay. Therefore, the fabrication of antifouling sensors with stratified zwitterionic peptides provides an efficient strategy for food safety inspection.
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Affiliation(s)
- Yinqiang Xia
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Xinru Dong
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Heng Chang
- School of Marine Science and Technology, Tianjin University, Tianjin, 300072, China
| | - Xiwen Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Jinyu Li
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Siqi Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Yang Lu
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Tianli Yue
- College of Food Science and Engineering, Northwest University, Xi'an 710069, China
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2
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Li H, Zhang Y, Deng Z, Lu B, Ma L, Wang R, Wang X, Jiao Z, Wang Y, Zhou K, Wei Q. Constructing a Hydrophilic Microsensor for High-Antifouling Neurotransmitter Dopamine Sensing. ACS Sens 2024; 9:1785-1798. [PMID: 38384144 DOI: 10.1021/acssensors.3c02042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Real-time sensing of dopamine is essential for understanding its physiological function and clarifying the pathophysiological mechanism of diseases caused by impaired dopamine systems. However, severe fouling from nonspecific protein adsorption, for a long time, limited conventional neural recording electrodes concerning recording stability. This study reported a high-antifouling nanocrystalline boron-doped diamond microsensor grown on a carbon fiber substrate. The antifouling properties of this diamond sensor were strongly related to the grain size (i.e., nanocrystalline and microcrystalline) and surface terminations (i.e., oxygen and hydrogen terminals). Experimental observations and molecular dynamics calculations demonstrated that the oxygen-terminated nanocrystalline boron-doped diamond microsensor exhibited enhanced antifouling characteristics against protein adsorption, which was attributed to the formation of a strong hydration layer as a physical and energetic barrier that prevents protein adsorption on the surface. This finally allowed for in vivo monitoring of dopamine in rat brains upon potassium chloride stimulation, thus presenting a potential solution for the design of next-generation antifouling neural recording sensors. Experimental observations and molecular dynamics calculations demonstrated that the oxygen-terminated nanocrystalline boron-doped diamond (O-NCBDD) microsensor exhibited ultrahydrophilic properties with a contact angle of 4.9°, which was prone to forming a strong hydration layer as a physical and energetic barrier to withstand the adsorption of proteins. The proposed O-NCBDD microsensor exhibited a high detection sensitivity of 5.14 μA μM-1 cm-2 and a low detection limit of 25.7 nM. This finally allowed for in vivo monitoring of dopamine with an average concentration of 1.3 μM in rat brains upon 2 μL of potassium chloride stimulation, thus presenting a potential solution for the design of next-generation antifouling neural recording sensors.
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Affiliation(s)
- Haichao Li
- State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China
| | - Yening Zhang
- Department of Hematology and Critical Care Medicine, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410000, P. R. China
- Key Laboratory of Sepsis Translational Medicine of Hunan, Central South University, Changsha, Hunan Province 410000, P. R. China
| | - Zejun Deng
- State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China
| | - Ben Lu
- Department of Hematology and Critical Care Medicine, The Third Xiangya Hospital, Central South University, Changsha, Hunan Province 410000, P. R. China
- Key Laboratory of Sepsis Translational Medicine of Hunan, Central South University, Changsha, Hunan Province 410000, P. R. China
| | - Li Ma
- State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China
| | - Run Wang
- State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China
| | - Xiang Wang
- State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China
| | - Zengkai Jiao
- State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China
| | - Yijia Wang
- Institute for Advanced Study, Central South University, Changsha 410083, P. R. China
| | - Kechao Zhou
- State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China
| | - Qiuping Wei
- State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China
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Albarghouthi FM, Semeniak D, Khanani I, Doherty JL, Smith BN, Salfity M, MacFarlane Q, Karappur A, Noyce SG, Williams NX, Joh DY, Andrews JB, Chilkoti A, Franklin AD. Addressing Signal Drift and Screening for Detection of Biomarkers with Carbon Nanotube Transistors. ACS NANO 2024. [PMID: 38335120 DOI: 10.1021/acsnano.3c11679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/12/2024]
Abstract
Electrical biosensors, including transistor-based devices (i.e., BioFETs), have the potential to offer versatile biomarker detection in a simple, low-cost, scalable, and point-of-care manner. Semiconducting carbon nanotubes (CNTs) are among the most explored nanomaterial candidates for BioFETs due to their high electrical sensitivity and compatibility with diverse fabrication approaches. However, when operating in solutions at biologically relevant ionic strengths, CNT-based BioFETs suffer from debilitating levels of signal drift and charge screening, which are often unaccounted for or sidestepped (but not addressed) by testing in diluted solutions. In this work, we present an ultrasensitive CNT-based BioFET called the D4-TFT, an immunoassay with an electrical readout, which overcomes charge screening and drift-related limitations of BioFETs. In high ionic strength solution (1X PBS), the D4-TFT repeatedly and stably detects subfemtomolar biomarker concentrations in a point-of-care form factor by increasing the sensing distance in solution (Debye length) and mitigating signal drift effects. Debye length screening and biofouling effects are overcome using a poly(ethylene glycol)-like polymer brush interface (POEGMA) above the device into which antibodies are printed. Simultaneous testing of a control device having no antibodies printed over the CNT channel confirms successful detection of the target biomarker via an on-current shift caused by antibody sandwich formation. Drift in the target signal is mitigated by a combination of: (1) maximizing sensitivity by appropriate passivation alongside the polymer brush coating; (2) using a stable electrical testing configuration; and (3) enforcing a rigorous testing methodology that relies on infrequent DC sweeps rather than static or AC measurements. These improvements are realized in a relatively simple device using printed CNTs and antibodies for a low-cost, versatile platform for the ongoing pursuit of point-of-care BioFETs.
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Affiliation(s)
- Faris M Albarghouthi
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Daria Semeniak
- Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Iman Khanani
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - James L Doherty
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Brittany N Smith
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Matthew Salfity
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Quentin MacFarlane
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Aneesh Karappur
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Steven G Noyce
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Nicholas X Williams
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Daniel Y Joh
- Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Joseph B Andrews
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Ashutosh Chilkoti
- Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Aaron D Franklin
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
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Wang S, Dong X, Li J, Liu J, Ruan Y, Xia Y. Design of a Facile Antifouling Sensor Based on the Synergy between an Antibody and Phase-Transited BSA. BIOSENSORS 2023; 13:1004. [PMID: 38131764 PMCID: PMC10741890 DOI: 10.3390/bios13121004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/21/2023] [Accepted: 11/24/2023] [Indexed: 12/23/2023]
Abstract
Nonspecific adsorption has always been a critical challenge for sensor detection; thus, an efficient and facile approach for fabricating antifouling sensors is highly desirable. Here, we developed an antifouling coating on sensor surfaces, conveniently made with a simple drip of phase-transited BSA (PTB) followed by a modification with a peanut allergen antibody, which unexpectedly provides synergistic antifouling properties in sensors. Atomic force microscopy and scanning electron microscopy were used to evaluate the surface evenness. Optimizations in terms of PTB modification time and concentrations were performed using surface plasmon resonance by measuring protein resistance capabilities. Compared to bare Au surfaces, the PTB-modified surfaces exhibited low adsorption against BSA (<10 ng/cm2) and good resistance against lysozyme (Lyz). After immobilizing antibodies, the antifouling performance of the sensor coatings had an obvious enhancement, with almost no BSA adsorption and low lysozyme adsorption. The target recognition was also analyzed to verify the good sensing performance of the antifouling sensor. This understanding of antibody synergy provides suggestions for the development of antifouling sensors.
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Affiliation(s)
- Siqi Wang
- College of Chemistry and Pharmacy, Northwest A&F University, Yangling 712100, China;
| | - Xinru Dong
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; (X.D.); (J.L.); (J.L.); (Y.R.)
| | - Jialu Li
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; (X.D.); (J.L.); (J.L.); (Y.R.)
| | - Jialei Liu
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; (X.D.); (J.L.); (J.L.); (Y.R.)
| | - Yifei Ruan
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; (X.D.); (J.L.); (J.L.); (Y.R.)
| | - Yinqiang Xia
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; (X.D.); (J.L.); (J.L.); (Y.R.)
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Mohanty S, Stevenson J, Browning AR, Jacobson L, Leswing K, Halls MD, Afzal MAF. Development of scalable and generalizable machine learned force field for polymers. Sci Rep 2023; 13:17251. [PMID: 37821501 PMCID: PMC10567837 DOI: 10.1038/s41598-023-43804-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 09/28/2023] [Indexed: 10/13/2023] Open
Abstract
Understanding and predicting the properties of polymers is vital to developing tailored polymer molecules for desired applications. Classical force fields may fail to capture key properties, for example, the transport properties of certain polymer systems such as polyethylene glycol. As a solution, we present an alternative potential energy surface, a charge recursive neural network (QRNN) model trained on DFT calculations made on smaller atomic clusters that generalizes well to oligomers comprising larger atomic clusters or longer chains. We demonstrate the validity of the polymer QRNN workflow by modeling the oligomers of ethylene glycol. We apply two rounds of active learning (addition of new training clusters based on current model performance) and implement a novel model training approach that uses partial charges from a semi-empirical method. Our developed QRNN model for polymers produces stable molecular dynamics (MD) simulation trajectory and captures the dynamics of polymer chains as indicated by the striking agreement with experimental values. Our model allows working on much larger systems than allowed by DFT simulations, at the same time providing a more accurate force field than classical force fields which provides a promising avenue for large-scale molecular simulations of polymeric systems.
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Moyer J, Wilson MW, Sorrentino TA, Santandreu A, Chen C, Hu D, Kerdok A, Porock E, Wright N, Ly J, Blaha C, Frassetto LA, Fissell WH, Vartanian SM, Roy S. Renal Embolization-Induced Uremic Swine Model for Assessment of Next-Generation Implantable Hemodialyzers. Toxins (Basel) 2023; 15:547. [PMID: 37755973 PMCID: PMC10536310 DOI: 10.3390/toxins15090547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 08/22/2023] [Accepted: 08/30/2023] [Indexed: 09/28/2023] Open
Abstract
Reliable models of renal failure in large animals are critical to the successful translation of the next generation of renal replacement therapies (RRT) into humans. While models exist for the induction of renal failure, none are optimized for the implantation of devices to the retroperitoneal vasculature. We successfully piloted an embolization-to-implantation protocol enabling the first implant of a silicon nanopore membrane hemodialyzer (SNMHD) in a swine renal failure model. Renal arterial embolization is a non-invasive approach to near-total nephrectomy that preserves retroperitoneal anatomy for device implants. Silicon nanopore membranes (SNM) are efficient blood-compatible membranes that enable novel approaches to RRT. Yucatan minipigs underwent staged bilateral renal arterial embolization to induce renal failure, managed by intermittent hemodialysis. A small-scale arteriovenous SNMHD prototype was implanted into the retroperitoneum. Dialysate catheters were tunneled externally for connection to a dialysate recirculation pump. SNMHD clearance was determined by intermittent sampling of recirculating dialysate. Creatinine and urea clearance through the SNMHD were 76-105 mL/min/m2 and 140-165 mL/min/m2, respectively, without albumin leakage. Normalized creatinine and urea clearance measured in the SNMHD may translate to a fully implantable clinical-scale device. This pilot study establishes a path toward therapeutic testing of the clinical-scale SNMHD and other implantable RRT devices.
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Affiliation(s)
- Jarrett Moyer
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
| | - Mark W. Wilson
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Thomas A. Sorrentino
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Ana Santandreu
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Caressa Chen
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Dean Hu
- Outset Medical, San Jose, CA 95134, USA
| | | | - Edward Porock
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Nathan Wright
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
| | - Jimmy Ly
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
| | - Charles Blaha
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
| | - Lynda A. Frassetto
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - William H. Fissell
- Silicon Kidney, San Ramon, CA 94583, USA
- Division of Nephrology & Hypertension, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Shant M. Vartanian
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
| | - Shuvo Roy
- Departments of Bioengineering & Therapeutic Sciences, Surgery, Medicine, and Radiology & Biomedical Imaging, University of California, San Francisco, CA 94143, USA; (J.M.)
- Silicon Kidney, San Ramon, CA 94583, USA
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Kim EJ, Chen C, Gologorsky R, Santandreu A, Torres A, Wright N, Goodin MS, Moyer J, Chui BW, Blaha C, Brakeman P, Vartanian S, Tang Q, David Humes H, Fissell WH, Roy S. Feasibility of an implantable bioreactor for renal cell therapy using silicon nanopore membranes. Nat Commun 2023; 14:4890. [PMID: 37644033 PMCID: PMC10465514 DOI: 10.1038/s41467-023-39888-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 07/03/2023] [Indexed: 08/31/2023] Open
Abstract
The definitive treatment for end-stage renal disease is kidney transplantation, which remains limited by organ availability and post-transplant complications. Alternatively, an implantable bioartificial kidney could address both problems while enhancing the quality and length of patient life. An implantable bioartificial kidney requires a bioreactor containing renal cells to replicate key native cell functions, such as water and solute reabsorption, and metabolic and endocrinologic functions. Here, we report a proof-of-concept implantable bioreactor containing silicon nanopore membranes to offer a level of immunoprotection to human renal epithelial cells. After implantation into pigs without systemic anticoagulation or immunosuppression therapy for 7 days, we show that cells maintain >90% viability and functionality, with normal or elevated transporter gene expression and vitamin D activation. Despite implantation into a xenograft model, we find that cells exhibit minimal damage, and recipient cytokine levels are not suggestive of hyperacute rejection. These initial data confirm the potential feasibility of an implantable bioreactor for renal cell therapy utilizing silicon nanopore membranes.
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Affiliation(s)
- Eun Jung Kim
- University of California, San Francisco, CA, USA
| | - Caressa Chen
- University of California, San Francisco, CA, USA
| | | | | | | | - Nathan Wright
- University of California, San Francisco, CA, USA
- Silicon Kidney LLC, San Ramon, CA, USA
| | | | | | | | - Charles Blaha
- University of California, San Francisco, CA, USA
- Silicon Kidney LLC, San Ramon, CA, USA
| | | | | | - Qizhi Tang
- University of California, San Francisco, CA, USA
| | - H David Humes
- University of Michigan, Ann Arbor, MI, USA
- Innovative Biotherapies Inc, Ann Arbor, MI, USA
| | - William H Fissell
- Silicon Kidney LLC, San Ramon, CA, USA
- Vanderbilt University Medical Center, Nashville, TN, USA
| | - Shuvo Roy
- University of California, San Francisco, CA, USA.
- Silicon Kidney LLC, San Ramon, CA, USA.
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Chambon L, Das M, Vasilaki E, Petekidis G, Vamvakaki M. Colloidal Rod-Like Particles with Temperature-Driven Tunable Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:13674-13685. [PMID: 36263911 DOI: 10.1021/acs.langmuir.2c01716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Temperature-sensitive rod-like colloidal particles were synthesized by grafting a temperature-responsive polymer, poly(2-(dimethylamino)ethyl methacrylate) (PDMA), on the surface of high aspect ratio silica rods by surface-initiated atom transfer radical polymerization. The stability of the grafted polymer on the surface of the particles in aqueous solutions was found to deteriorate with time, leading to a gradual decrease of the polymer content of the hybrid colloids, which was attributed to the mechanically activated hydrolysis of the labile bonds at the polymer-silica interface. The polymer degrafting was significantly suppressed by first growing a hydrophobic poly(methyl methacrylate) block onto the particle surface to act as a barrier layer for the penetration of water molecules at the polymer-particle interface, followed by chain-extension with the hydrophilic PDMA chains. Dynamic light scattering, microscopy, and rheological measurements revealed that the PDMA block conferred a temperature-responsive behavior to the rod-like particles, which formed aggregates at temperatures above the lower critical solution temperature (LCST) of the polymer. However, in contrast to their spherical counterparts, the polymer-grafted rod-like particles did not exhibit complete thermo-reversibility upon lowering the solution temperature below the LCST of PDMA, which was reflected by different values of the diffusion coefficient for the heating and cooling cycles, indicating an irreversible rod particle aggregation upon increasing the temperature.
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Affiliation(s)
- Lucille Chambon
- Department of Materials Science and Technology, University of Crete, 700 13Heraklion, Crete, Greece
- Institute of Electronic Structure and Laser, Foundation for Research and Technology─Hellas, 700 13Heraklion, Crete, Greece
| | - Mohan Das
- Department of Materials Science and Technology, University of Crete, 700 13Heraklion, Crete, Greece
- Institute of Electronic Structure and Laser, Foundation for Research and Technology─Hellas, 700 13Heraklion, Crete, Greece
| | - Evangelia Vasilaki
- Department of Materials Science and Technology, University of Crete, 700 13Heraklion, Crete, Greece
- Institute of Electronic Structure and Laser, Foundation for Research and Technology─Hellas, 700 13Heraklion, Crete, Greece
| | - George Petekidis
- Department of Materials Science and Technology, University of Crete, 700 13Heraklion, Crete, Greece
- Institute of Electronic Structure and Laser, Foundation for Research and Technology─Hellas, 700 13Heraklion, Crete, Greece
| | - Maria Vamvakaki
- Department of Materials Science and Technology, University of Crete, 700 13Heraklion, Crete, Greece
- Institute of Electronic Structure and Laser, Foundation for Research and Technology─Hellas, 700 13Heraklion, Crete, Greece
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Albarghouthi FM, Williams NX, Doherty JL, Lu S, Franklin AD. Passivation Strategies for Enhancing Solution-Gated Carbon Nanotube Field-Effect Transistor Biosensing Performance and Stability in Ionic Solutions. ACS APPLIED NANO MATERIALS 2022; 5:15865-15874. [PMID: 36815139 PMCID: PMC9943062 DOI: 10.1021/acsanm.2c04098] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Interest in point-of-care diagnostics has led to increasing demand for the development of nanomaterial-based electronic biosensors such as biosensor field-effect transistors (BioFETs) due to their inherent simplicity, sensitivity, and scalability. The utility of BioFETs, which use electrical transduction to detect biological signals, is directly dependent upon their electrical stability in detection-relevant environments. BioFET device structures vary substantially, especially in electrode passivation modalities. Improper passivation of electronic components in ionic solutions can lead to excessive leakage currents and signal drift, thus presenting a hinderance to signal detectability. Here, we harness the sensitivity of nanomaterials to study the effects of various passivation strategies on the performance and stability of a transistor-based biosensing platform based on aerosol-jet-printed carbon nanotube thin-film transistors. Specifically, non-passivated devices were compared to devices passivated with photoresist (SU-8), dielectric (HfO2), or photoresist + dielectric (SU-8 followed by HfO2) and were evaluated primarily by initial performance metrics, large-scale device yield, and stability throughout long-duration cycling in phosphate buffered saline. We find that all three passivation conditions result in improved device performance compared to non-passivated devices, with the photoresist + dielectric strategy providing the lowest average leakage current in solution (~2 nA). Notably, the photoresist + dielectric strategy also results in the greatest yield of BioFET devices meeting our selected performance criteria on a wafer scale (~90%), the highest long-term stability in solution (<0.01% change in on-current), and the best average on/off-current ratio (~104), hysteresis (~32 mV), and subthreshold swing (~192 mV/decade). This passivation schema has the potential to pave the path toward a truly high-yield, stable, and robust electrical biosensing platform.
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Affiliation(s)
- Faris M. Albarghouthi
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Nicholas X. Williams
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - James L. Doherty
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Shiheng Lu
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Aaron D. Franklin
- Department of Electrical & Computer Engineering, Duke University, Durham, North Carolina 27708, United States
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
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10
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Attractive and Repulsive Fluctuation-Induced Pressure in Peptide Films Deposited on Semiconductor Substrates. Symmetry (Basel) 2022. [DOI: 10.3390/sym14102196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
We consider the fluctuation-induced (Casimir) pressure in peptide films deposited on GaAs, Ge, and ZnS substrates which are either in a dielectric or metallic state. The calculations of the Casimir pressure are performed in the framework of the fundamental Lifshitz theory employing the frequency-dependent dielectric permittivities of all involved materials. The electric conductivity of semiconductor substrates is taken into account within the experimentally and thermodynamically consistent approach. According to our results, the Casimir pressure in peptide films deposited on dielectric-type semiconductor substrates vanishes for some definite film thickness and is repulsive for thinner and attractive for thicker films. The dependence of this effect on the fraction of water in the film and on the static dielectric permittivity of the semiconductor substrate is determined. For the metallic-type semiconductor substrates, the Casimir pressure in peptide coatings is shown to be always repulsive. The possible applications of these results to the problem of stability of thin coatings in microdevices are discussed.
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11
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De La Franier B, Asker D, Hatton B, Thompson M. Long-Term Reduction of Bacterial Adhesion on Polyurethane by an Ultra-Thin Surface Modifier. Biomedicines 2022; 10:979. [PMID: 35625716 PMCID: PMC9138992 DOI: 10.3390/biomedicines10050979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 04/12/2022] [Accepted: 04/21/2022] [Indexed: 11/16/2022] Open
Abstract
Indwelling urinary catheters are employed widely to relieve urinary retention in patients. A common side effect of the use of these catheters is the formation of urinary tract infections (UTIs), which can lead not only to severe medical complications, but even to death. A number of approaches have been used to attempt reduction in the rate of UTI development in catheterized patients, which include the application of antibiotics and modification of the device surface by coatings. Many of these coatings have not seen use on catheters in medical settings due to either the high cost of their implementation, their long-term stability, or their safety. In previous work, it has been established that the simple, stable, and easily applicable sterilization surface coating 2-(3-trichlorosilylpropyloxy)-ethyl hydroxide (MEG-OH) can be applied to polyurethane plastic, where it greatly reduces microbial fouling from a variety of species for a 1-day time period. In the present work, we establish that this coating is able to remain stable and provide a similarly large reduction in fouling against Escherichia coli and Staphylococcus aureus for time periods in an excess of 30 days. This non-specific coating functioned against both Gram-positive and Gram-negative bacteria, providing a log 1.1 to log 1.9 reduction, depending on the species and day. This stability and continued efficacy greatly suggest that MEG-OH may be capable of providing a solution to the UTI issue which occurs with urinary catheters.
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Affiliation(s)
- Brian De La Franier
- Department of Chemistry, University of Toronto, 80 George Street, Toronto, ON M5S 3H6, Canada;
| | - Dalal Asker
- Department of Materials Science, University of Toronto, 184 College Street, Toronto, ON M5S 3E4, Canada; (D.A.); (B.H.)
| | - Benjamin Hatton
- Department of Materials Science, University of Toronto, 184 College Street, Toronto, ON M5S 3E4, Canada; (D.A.); (B.H.)
| | - Michael Thompson
- Department of Chemistry, University of Toronto, 80 George Street, Toronto, ON M5S 3H6, Canada;
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12
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Gnanasampanthan T, Karthäuser JF, Spöllmann S, Wanka R, Becker HW, Rosenhahn A. Amphiphilic Alginate-Based Layer-by-Layer Coatings Exhibiting Resistance against Nonspecific Protein Adsorption and Marine Biofouling. ACS APPLIED MATERIALS & INTERFACES 2022; 14:16062-16073. [PMID: 35377590 DOI: 10.1021/acsami.2c01809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Amphiphilic coatings are promising materials for fouling-release applications, especially when their building blocks are inexpensive, biodegradable, and readily accessible polysaccharides. Here, amphiphilic polysaccharides were fabricated by coupling hydrophobic pentafluoropropylamine (PFPA) to carboxylate groups of hydrophilic alginic acid, a natural biopolymer with high water-binding capacity. Layer-by-layer (LbL) coatings comprising unmodified or amphiphilic alginic acid (AA*) and polyethylenimine (PEI) were assembled to explore how different PFPA contents affect their physicochemical properties, resistance against nonspecific adsorption (NSA) of proteins, and antifouling activity against marine bacteria (Cobetia marina) and diatoms (Navicula perminuta). The amphiphilic multilayers, characterized through spectroscopic ellipsometry, water contact angle goniometry, elemental analysis, AFM, XPS, and SPR spectroscopy, showed similar or even higher swelling in water and exhibited higher resistance toward NSA of proteins and microfouling marine organisms than multilayers without fluoroalkyl groups.
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Affiliation(s)
| | - Jana F Karthäuser
- Analytical Chemistry─Biointerfaces, Ruhr University Bochum, Bochum 44780, Germany
| | - Stephan Spöllmann
- RUBION, Central Unit for Ion Beams and Radionuclides, University of Bochum, Bochum 44780, Germany
| | - Robin Wanka
- Analytical Chemistry─Biointerfaces, Ruhr University Bochum, Bochum 44780, Germany
| | - Hans-Werner Becker
- RUBION, Central Unit for Ion Beams and Radionuclides, University of Bochum, Bochum 44780, Germany
| | - Axel Rosenhahn
- Analytical Chemistry─Biointerfaces, Ruhr University Bochum, Bochum 44780, Germany
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13
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Poly-2-methyl-2-oxazoline–modified bioprosthetic heart valve leaflets have enhanced biocompatibility and resist structural degeneration. Proc Natl Acad Sci U S A 2022; 119:2120694119. [PMID: 35131859 PMCID: PMC8833185 DOI: 10.1073/pnas.2120694119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/04/2022] [Indexed: 12/26/2022] Open
Abstract
Bioprosthetic heart valves (BHV) fabricated from glutaraldehyde-fixed heterograft tissue, such as bovine pericardium (BP), are widely used for treating heart valve disease, a group of disorders that affects millions. Structural valve degeneration (SVD) of BHV due to both calcification and the accumulation of advanced glycation end products (AGE) with associated serum proteins limits durability. We hypothesized that BP modified with poly-2-methyl-2-oxazoline (POZ) to inhibit protein entry would demonstrate reduced accumulation of AGE and serum proteins, mitigating SVD. In vitro studies of POZ-modified BP demonstrated reduced accumulation of serum albumin and AGE. BP-POZ in vitro maintained collagen microarchitecture per two-photon microscopy despite AGE incubation, and in cell culture studies was associated with no change in tumor necrosis factor-α after exposure to AGE and activated macrophages. Comparing POZ and polyethylene glycol (PEG)–modified BP in vitro, BP-POZ was minimally affected by oxidative conditions, whereas BP-PEG was susceptible to oxidative deterioration. In juvenile rat subdermal implants, BP-POZ demonstrated reduced AGE formation and serum albumin infiltration, while calcification was not inhibited. However, BP-POZ rat subdermal implants with ethanol pretreatment demonstrated inhibition of both AGE accumulation and calcification. Ex vivo laminar flow studies with human blood demonstrated BP-POZ enhanced thromboresistance with reduced white blood cell accumulation. We conclude that SVD associated with AGE and serum protein accumulation can be mitigated through POZ functionalization that both enhances biocompatibility and facilitates ethanol pretreatment inhibition of BP calcification.
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14
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Velichko EN, Nepomnyashchaya EK, Baranov MA, Skvortsov AN, Pleshakov IV, Dong G. Aggregation Properties of Albumin in Interacting with Magnetic Fluids. Int J Mol Sci 2021; 22:10734. [PMID: 34639075 PMCID: PMC8509288 DOI: 10.3390/ijms221910734] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 09/27/2021] [Accepted: 09/29/2021] [Indexed: 11/16/2022] Open
Abstract
In this study, interactions of Fe3O4 magnetic nanoparticles with serum albumin biomolecules in aqueous solutions were considered. The studies were conducted with the laser correlation spectroscopy and optical analysis of dehydrated films. It was shown that the addition of magnetite to an albumin solution at low concentrations of up to 10-6 g/L led to the formation of aggregates with sizes of up to 300 nm in the liquid phase and an increase in the number of spiral structures in the dehydrated films, which indicated an increase in their stability. With a further increase in the magnetite concentration in the solution (from 10-4 g/L), the magnetic particles stuck together and to albumin, thus forming aggregates with sizes larger than 1000 nm. At the same time, the formation of morphological structures in molecular films was disturbed, and a characteristic decrease in their stability occurred. Most stable films were formed at low concentrations of magnetic nanoparticles (less than 10-4 g/L) when small albumin-magnetic nanoparticle aggregates were formed. These results are important for characterizing the interaction processes of biomolecules with magnetic nanoparticles and can be useful for predicting the stability of biomolecular films with the inclusion of magnetite particles.
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Affiliation(s)
- Elena N. Velichko
- Institute of Electronics and Telecommunications, Peter the Great St. Petersburg Polytechnic University, 195251 Saint Petersburg, Russia
| | - Elina K. Nepomnyashchaya
- Institute of Electronics and Telecommunications, Peter the Great St. Petersburg Polytechnic University, 195251 Saint Petersburg, Russia
| | - Maksim A. Baranov
- Institute of Electronics and Telecommunications, Peter the Great St. Petersburg Polytechnic University, 195251 Saint Petersburg, Russia
| | - Alexey N. Skvortsov
- Institute of Biomedical Systems and Biotechnology, Peter the Great St. Petersburg Polytechnic University, 195251 Saint Petersburg, Russia;
| | | | - Ge Dong
- School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
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15
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De La Franier B, Asker D, van den Berg D, Hatton B, Thompson M. Reduction of microbial adhesion on polyurethane by a sub-nanometer covalently-attached surface modifier. Colloids Surf B Biointerfaces 2021; 200:111579. [PMID: 33517152 DOI: 10.1016/j.colsurfb.2021.111579] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 12/23/2020] [Accepted: 01/11/2021] [Indexed: 01/03/2023]
Abstract
Indwelling urinary catheters are a common medical device used to relieve urinary retention. Many patients who undergo urinary catheterization develop urinary tract infections (UTIs), which can lead to severe medical complications and high cost of subsequent treatment. Recent years have seen a number of attempts at reducing the rate of UTIs in catheterized patients via catheter surface modifications. In this work, a low cost, robust anti-thrombogenic, and sterilizable anti-fouling layer based on a covalently-bound monoethylene glycol hydroxide (MEG-OH) was attached to polyurethane, a polymeric material commonly used to fabricate catheters. Modified polyurethane tubing was compared to bare tubing after exposure to a wide spectrum of pathogens including Gram-negative bacteria (Pesudomonas aeruginosa, Escherichia coli), Gram-positive bacteria (Staphylococcus aureus) and a fungus (Candida albicans). It has been demonstrated that the MEG-OH monolayer was able to significantly reduce the amount of adhesion of pathogens present on the material surface, with between 85 and 96 % reduction after 24 h of exposure. Additionally, similar reductions in surface fouling were observed following autoclave sterilization, long term storage of samples in air, and longer exposure up to 3 days.
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Affiliation(s)
- Brian De La Franier
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Dalal Asker
- Department of Materials Science, University of Toronto, 140-184 College St, Toronto, Ontario, M5S 3E4, Canada; Food Science & Technology Department, Faculty of Agriculture, Alexandria University, 21545 - El-Shatby, Alexandria, Egypt
| | - Desmond van den Berg
- Department of Materials Science, University of Toronto, 140-184 College St, Toronto, Ontario, M5S 3E4, Canada
| | - Benjamin Hatton
- Department of Materials Science, University of Toronto, 140-184 College St, Toronto, Ontario, M5S 3E4, Canada
| | - Michael Thompson
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada.
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16
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Fuchs S, Ernst AU, Wang LH, Shariati K, Wang X, Liu Q, Ma M. Hydrogels in Emerging Technologies for Type 1 Diabetes. Chem Rev 2020; 121:11458-11526. [DOI: 10.1021/acs.chemrev.0c01062] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Stephanie Fuchs
- Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Alexander U. Ernst
- Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Long-Hai Wang
- Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Kaavian Shariati
- Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Xi Wang
- Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Qingsheng Liu
- Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Minglin Ma
- Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States
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17
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Beyer CD, Reback ML, Heinen N, Thavalingam S, Rosenhahn A, Metzler-Nolte N. Low Fouling Peptides with an All (d) Amino Acid Sequence Provide Enhanced Stability against Proteolytic Degradation While Maintaining Low Antifouling Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:10996-11004. [PMID: 32830498 DOI: 10.1021/acs.langmuir.0c01790] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Peptide-functionalized surfaces, composed of optimized l-peptides, show a high resistance toward nonspecific adsorption of proteins. As l-peptides are known to be prone to proteolytic degradation, the aim of this work is to enhance the stability against enzymatic degradation by using the all d-peptide mirror image of the optimized l-peptides and to determine if the all d-enantiomer retains the protein-resistant and antifouling properties. Two l-peptides and their d-peptide mirror images, some of them containing the nonproteinogenic amino acid α-aminoisobutyric acid (Aib), were synthesized and tested against non-specific adsorption of the proteins lysozyme and fibrinogen and the settlement of marine diatom Navicula perminuta and marine bacteria Cobetia marina. Both the d-enantiomer and the insertion of Aib protected the peptides from proteolytic degradation. Protein resistance was enhanced with the d-enantiomers while maintaining the resistance toward diatoms.
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Affiliation(s)
- Cindy D Beyer
- Analytical Chemistry I-Biointerfaces, Ruhr University Bochum, 44801 Bochum, Germany
| | - Matthew L Reback
- Inorganic Chemistry I-Bioinorganic Chemistry, Ruhr University Bochum, 44801 Bochum, Germany
| | - Natalie Heinen
- Analytical Chemistry I-Biointerfaces, Ruhr University Bochum, 44801 Bochum, Germany
| | - Sugina Thavalingam
- Inorganic Chemistry I-Bioinorganic Chemistry, Ruhr University Bochum, 44801 Bochum, Germany
| | - Axel Rosenhahn
- Analytical Chemistry I-Biointerfaces, Ruhr University Bochum, 44801 Bochum, Germany
| | - Nils Metzler-Nolte
- Inorganic Chemistry I-Bioinorganic Chemistry, Ruhr University Bochum, 44801 Bochum, Germany
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18
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Haroun F, El Haitami A, Ober P, Backus EHG, Cantin S. Poly(ethylene glycol)- block-poly(propylene glycol)- block-poly(ethylene glycol) Copolymer 2D Single Network at the Air-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:9142-9152. [PMID: 32686418 DOI: 10.1021/acs.langmuir.0c01398] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this work, Langmuir monolayers based on poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) (PEG-PPG-PEG) triblock copolymer were in situ stabilized at the air-water interface in the presence of a cross-linking agent, benzene-1,3,5-tricarboxaldehyde (BTC), in the aqueous subphase. The reaction takes place through acid-catalyzed acetalization between the terminal hydroxyl groups of the copolymer and aldehyde functions of the BTC molecules. Mean area per repeat unit measurements as a function of the reaction time show a significant monolayer contraction associated with an increase in its compressibility modulus. In addition, Brewster angle microscopy observations indicate the appearance of higher-density two-dimensional domains, irreversibly formed at constant surface pressure. This is also confirmed on a smaller scale by atomic force microscopy (AFM). These arguments, consistent with copolymer monolayer cross-linking in acidic medium, are supported in situ at the air-water interface by sum-frequency generation (SFG) spectroscopy. Furthermore, PEG-PPG-PEG monolayer cross-linking is not evidenced in alkaline medium, in coherence with the interfacial acid-catalyzed acetalization.
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Affiliation(s)
- Ferhat Haroun
- LPPI, CY Cergy Paris Université, F95000 Cergy, France
| | | | - Patrick Ober
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Sophie Cantin
- LPPI, CY Cergy Paris Université, F95000 Cergy, France
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19
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Liu Q, Zhou X, Wu H, Zheng B. Blocking-free and self-contained immunoassay platform for one-step point-of-care testing. Biosens Bioelectron 2020; 165:112394. [PMID: 32729515 DOI: 10.1016/j.bios.2020.112394] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 06/01/2020] [Accepted: 06/14/2020] [Indexed: 12/31/2022]
Abstract
This paper reports a quantitative and sensitive one-step point-of-care testing (POCT) chip built on a perfluorinated substrate patterned with polydopamine microspots array. The capture antibody was covalently immobilized on the polydopamine microspots, while the fluorescently labelled detection antibody was physically adsorbed on the perfluorinated surface. The POCT chip allowed one-step sandwich immunoassay and was able to directly detect the analytes from the whole blood without sample preprocessing. By further taking advantages of the strong fluorescence quenching ability of the polydopamine, the blocking-free substrate was able to achieve similar performance in detecting and quantifying the protein biomarkers as the substrate with the blocking treatment. The blocking-free strategy not only made the fabrication of the chip simple and convenient, but also improved the chip's sensitivity for biomarker quantification. Finally, we demonstrated that the self-contained POCT platform maintained the performance for one-step immunoassay even after long-term storage. With the POCT platform, we are one step closer to a sample-in-answer-out diagnostic system.
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Affiliation(s)
- Qi Liu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Xiaohu Zhou
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong, China; College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China.
| | - Han Wu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Bo Zheng
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
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20
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Bülbül E, Hegemann D, Geue T, Heuberger M. How the dynamics of subsurface hydration regulates protein-surface interactions. Colloids Surf B Biointerfaces 2020; 190:110908. [PMID: 32163842 DOI: 10.1016/j.colsurfb.2020.110908] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 02/13/2020] [Accepted: 02/25/2020] [Indexed: 10/24/2022]
Abstract
The role of water structure near surfaces has been scrutinized extensively because it is accepted to control protein-surface interactions, however, often avoiding effects of hydration dynamics. Relating to this, we have recently discussed how the amount and state of water, accumulated within various hydrophobic-to-hydrophilic subsurface gradients of plasma polymer films, influence the magnitude of adsorbed bovine serum albumin, spurring the hypothesis of the presence of a subsurface dipolar field. This study now analyzes the kinetics of hydration by systematically introducing modified gradient architectures and relating different hydration times to the adsorption of a dipolar probing protein. We find that dry-stored subsurface gradients, owing nominally identical surface characteristics, exhibits comparable surface potential and protein adsorption values, while they behave in a different manner at transient hydration times of few hours, before reaching near-equilibrium state of the hydration. A characteristic hydration time is found where protein adsorption on gradient films is minimal, unveiling the transient nature of the effect. In general, protein adsorption is sensitive to the time allowed for hydration of the adsorbent surface, supporting our initial hypothesis inasmuch as the quantity as well as quality of water inside the subsurface matrix is crucial for controlling protein-surface interactions.
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Affiliation(s)
- Ezgi Bülbül
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, 9014, St. Gallen, Switzerland; Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland.
| | - Dirk Hegemann
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, 9014, St. Gallen, Switzerland.
| | - Thomas Geue
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute (PSI), 5232, Villigen, Switzerland.
| | - Manfred Heuberger
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, 9014, St. Gallen, Switzerland; Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland.
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21
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Liu Q, Chiu A, Wang L, An D, Li W, Chen EY, Zhang Y, Pardo Y, McDonough SP, Liu L, Liu WF, Chen J, Ma M. Developing mechanically robust, triazole-zwitterionic hydrogels to mitigate foreign body response (FBR) for islet encapsulation. Biomaterials 2020; 230:119640. [DOI: 10.1016/j.biomaterials.2019.119640] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 11/17/2019] [Accepted: 11/18/2019] [Indexed: 01/10/2023]
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22
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Dang BV, Taylor RA, Charlton AJ, Le-Clech P, Barber TJ. Toward Portable Artificial Kidneys: The Role of Advanced Microfluidics and Membrane Technologies in Implantable Systems. IEEE Rev Biomed Eng 2020; 13:261-279. [DOI: 10.1109/rbme.2019.2933339] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Wanka R, Aldred N, Finlay JA, Amuthalingam A, Clarke JL, Clare AS, Rosenhahn A. Antifouling Properties of Dendritic Polyglycerols against Marine Macrofouling Organisms. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:16568-16575. [PMID: 31746204 DOI: 10.1021/acs.langmuir.9b02720] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Dendritic polyglycerols (PGs) were synthesized and postmodified by grafting of poly(ethylene glycol) (PEG) and polypropylene glycol (PPG) diglycidyl ether groups, and their antifouling and fouling-release properties were tested. Coating characterization by spectroscopic ellipsometry, contact angle goniometry, attenuated total internal reflection-Fourier transform infrared spectroscopy (ATR-FTIR), and atomic force microscopy showed brushlike morphologies with a high degree of microscale roughness and the ability to absorb large amounts of water within seconds. PGs with three different thicknesses were tested in laboratory assays against settlement of larvae of the barnacle Balanus improvisus and against the settlement and removal of zoospores of the alga Ulva linza. Very low coating thicknesses, e.g., 11 nm, reduced the settlement of barnacles, under static conditions, to 2% compared with 55% for an octadecyltrichlorosilane reference surface. In contrast, zoospores of U. linza settled readily but the vast majority were removed by exposure to a shear force of 52 Pa. Both PEG and PPG modification increased the antifouling properties of the PG films, providing a direct comparison of the ultralow fouling properties of all three polymers. Both, the modified and the nonmodified PGs are promising components for incorporation into amphiphilic fouling-resistant coatings.
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Affiliation(s)
- Robin Wanka
- Analytical Chemistry-Biointerfaces , Ruhr University Bochum , Bochum 44780 , Germany
| | - Nick Aldred
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - John A Finlay
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Ajitha Amuthalingam
- Analytical Chemistry-Biointerfaces , Ruhr University Bochum , Bochum 44780 , Germany
| | - Jessica L Clarke
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Anthony S Clare
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Axel Rosenhahn
- Analytical Chemistry-Biointerfaces , Ruhr University Bochum , Bochum 44780 , Germany
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24
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Atif M, Chen C, Irfan M, Mumtaz F, He K, Zhang M, Chen L, Wang Y. Poly(2-methyl-2-oxazoline) and poly(4-vinyl pyridine) based mixed brushes with switchable ability toward protein adsorption. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.08.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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25
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Griffo A, Liu Y, Mahlberg R, Alakomi HL, Johansson LS, Milani R. Design and Testing of a Bending-Resistant Transparent Nanocoating for Optoacoustic Cochlear Implants. ChemistryOpen 2019; 8:1100-1108. [PMID: 31406657 PMCID: PMC6682933 DOI: 10.1002/open.201900172] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Indexed: 12/25/2022] Open
Abstract
A nanosized coating was designed to reduce fouling on the surface of a new type of cochlear implant relying on optoacoustic stimulation. This kind of device imposes novel design principles for antifouling coatings, such as optical transparency and resistance to significant constant bending. To reach this goal we deposited on poly(dimethylsiloxane) a PEO-based layer with negligible thickness compared to the curvature radius of the cochlea. Its antifouling performance was monitored upon storage by quartz crystal microbalance, and its resistance upon bending was tested by fluorescence microscopy under geometrical constraints similar to those of implantation. The coating displayed excellent antifouling features and good stability, and proved suitable for further testing in real-environment conditions.
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Affiliation(s)
- Alessandra Griffo
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland.,Department of Bioproducts and Biosystems Aalto University P.O. Box 16100 FI-00076Aalto Espoo Finland
| | - Yingying Liu
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland
| | - Riitta Mahlberg
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland
| | - Hanna-L Alakomi
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland
| | - Leena-S Johansson
- Department of Bioproducts and Biosystems Aalto University P.O. Box 16100 FI-00076Aalto Espoo Finland
| | - Roberto Milani
- VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 FI-02044VTT Espoo Finland
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26
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Schune C, Yonger M, Bresson B, Fretigny C, Guy L, Chaussée T, Lequeux F, Montes H, Verneuil E. Combining Ellipsometry and AFM To Probe Subnanometric Precursor Film Dynamics of Polystyrene Melts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:7727-7734. [PMID: 31117730 DOI: 10.1021/acs.langmuir.9b00768] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We investigate the evolution over time of the space profiles of precursor films spreading away from a droplet of polymer in the poorly explored pseudo-partial wetting case. We use polystyrene melt droplets on oxidized silicon wafers. Interestingly, the film thicknesses measured by ellispometric microscopy are found in the 0.01 to 1 nm range. These thicknesses were validated by atomic force microscopy measurements performed on the textured film obtained after quenching at room temperature. From this, an effective thickness is obtained and compares well to the thicknesses measured by ellipsometry, validating the use of an optical method in this range of thickness. Ellipsometric microscopy provides a height resolution below the ångström with lateral resolution, image size, and framerate well adapted to spreading precursor films. From this, we demonstrate that precursor films of polystyrene consist of polymer chains with a surface density decreasing to zero away from the droplet. We further find that the polymer chains follow a simple diffusive law with the diffusion coefficient independent of density. This demonstrates that polystyrene chains spread independently in precursor films in pseudo-partial wetting condition. This behavior differs significantly from the case of chains spreading in total wetting for which the diffusion coefficient was found in the literature to depend on surface density or thickness.
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Affiliation(s)
- Claire Schune
- Soft Matter Sciences and Engineering (SIMM) , ESPCI Paris, PSL University, Sorbonne Université, CNRS , F-75005 Paris , France
| | - Marc Yonger
- Soft Matter Sciences and Engineering (SIMM) , ESPCI Paris, PSL University, Sorbonne Université, CNRS , F-75005 Paris , France
| | - Bruno Bresson
- Soft Matter Sciences and Engineering (SIMM) , ESPCI Paris, PSL University, Sorbonne Université, CNRS , F-75005 Paris , France
| | - Christian Fretigny
- Soft Matter Sciences and Engineering (SIMM) , ESPCI Paris, PSL University, Sorbonne Université, CNRS , F-75005 Paris , France
| | - Laurent Guy
- Solvay Silica , 15 rue Pierre Paÿs , BP 52, F-69660 Collonges-au-Mont-d'Or , France
| | - Thomas Chaussée
- Solvay Silica , 15 rue Pierre Paÿs , BP 52, F-69660 Collonges-au-Mont-d'Or , France
| | - François Lequeux
- Soft Matter Sciences and Engineering (SIMM) , ESPCI Paris, PSL University, Sorbonne Université, CNRS , F-75005 Paris , France
| | - Hélène Montes
- Soft Matter Sciences and Engineering (SIMM) , ESPCI Paris, PSL University, Sorbonne Université, CNRS , F-75005 Paris , France
| | - Emilie Verneuil
- Soft Matter Sciences and Engineering (SIMM) , ESPCI Paris, PSL University, Sorbonne Université, CNRS , F-75005 Paris , France
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27
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Abstract
This paper describes a simple method to pattern nanoparticles on planar surfaces using the antifouling property of poly(ethylene glycol) monolayers deposited from a solution on the native oxide of titanium. Atomic force microcopy was used to pattern the poly(ethylene glycol) monolayers producing protein active sites on the protein-resistant surface. Patterns with different sizes have been generated by shaving the monolayers with different repetitions. Friction force microscopy was used to image the patterns. The smallest patterns are 50 nm and the largest patterns are 500 nm at full width half maximum. The smallest pattern was produced with one shave, whereas the largest pattern was produced by shaving the monolayers 112 times. Protein-coated nanoparticles were immobilised on the shaved (protein active) part of the monolayers by dipping the patterned samples into a solution that contains 2% by volume protein-functionalized nanoparticles with a nominal diameter of 40 nm. Atomic force microscopy was used to take a topographic image of the samples. The topographic image showed that the protein-functionalized nanoparticles were attached onto the shaved part of the substrate but not on the poly(ethylene glycol)-covered part of the substrate. The level of aggregation of the nanoparticles was also investigated from the topographic image. The section analysis of the topographic image of the nanoparticle patterns showed a height of 40 nm which proved that only a monolayer of particles were deposited on the shaved part of the monolayer.
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28
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Shao Q. A computational avenue towards understanding and design of zwitterionic anti-biofouling materials. MOLECULAR SIMULATION 2019. [DOI: 10.1080/08927022.2019.1599118] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Qing Shao
- Chemical and Materials Engineering, University of Kentucky, Lexington KY, USA
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29
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Baranov MA, Klimchitskaya GL, Mostepanenko VM, Velichko EN. Fluctuation-induced free energy of thin peptide films. Phys Rev E 2019; 99:022410. [PMID: 30934220 DOI: 10.1103/physreve.99.022410] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Indexed: 01/11/2023]
Abstract
We apply the Lifshitz theory of dispersion forces to find a contribution to the free energy of peptide films that is caused by the zero-point and thermal fluctuations of the electromagnetic field. For this purpose, using available information about the imaginary parts of the dielectric permittivity of peptides, an analytic representation for permittivity of a typical peptide along the imaginary frequency axis is devised. Numerical computations of the fluctuation-induced free energy are performed at room temperature for freestanding peptide films containing different fractions of water, and for similar films deposited on dielectric (SiO_{2}) and metallic (Au) substrates. It is shown that the free energy of a freestanding peptide film is negative and thus contributes to its stability. The magnitude of the free energy increases with increasing fraction of water and decreases with increasing thickness of a film. For peptide films deposited on a dielectric substrate, the free energy is nonmonotonous. It is negative for films thicker than 100nm, reaches the maximum value at some film thickness, but vanishes and changes its sign for films thinner than 100nm. The fluctuation-induced free energy of peptide films deposited on metallic substrate is found to be positive, which makes films less stable. In all three cases, simple analytic expressions for the free energy of sufficiently thick films are found. The obtained results may be useful to attain film stability in the next generation of organic microdevices with further reduced dimensions.
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Affiliation(s)
- M A Baranov
- Institute of Physics, Nanotechnology and Telecommunications, Peter the Great Saint Petersburg Polytechnic University, Saint Petersburg 195251, Russia
| | - G L Klimchitskaya
- Institute of Physics, Nanotechnology and Telecommunications, Peter the Great Saint Petersburg Polytechnic University, Saint Petersburg 195251, Russia.,Central Astronomical Observatory at Pulkovo of the Russian Academy of Sciences, Saint Petersburg 196140, Russia
| | - V M Mostepanenko
- Institute of Physics, Nanotechnology and Telecommunications, Peter the Great Saint Petersburg Polytechnic University, Saint Petersburg 195251, Russia.,Central Astronomical Observatory at Pulkovo of the Russian Academy of Sciences, Saint Petersburg 196140, Russia.,Kazan Federal University, Kazan 420008, Russia
| | - E N Velichko
- Institute of Physics, Nanotechnology and Telecommunications, Peter the Great Saint Petersburg Polytechnic University, Saint Petersburg 195251, Russia
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30
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Iqbal Z, Kim S, Moyer J, Moses W, Abada E, Wright N, Kim EJ, Park J, Fissell WH, Vartanian S, Roy S. In vitro and in vivo hemocompatibility assessment of ultrathin sulfobetaine polymer coatings for silicon-based implants. J Biomater Appl 2019; 34:297-312. [PMID: 30862226 DOI: 10.1177/0885328219831044] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Zohora Iqbal
- 1 Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
| | - Steven Kim
- 1 Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
| | - Jarrett Moyer
- 1 Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
| | - Willieford Moses
- 1 Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
| | - Emily Abada
- 1 Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
| | - Nathan Wright
- 1 Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
| | - Eun Jung Kim
- 1 Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
| | - Jaehyun Park
- 1 Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
| | | | - Shant Vartanian
- 3 Division of Vascular & Endovascular Surgery, University of California, San Francisco, USA
| | - Shuvo Roy
- 1 Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, USA
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31
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Wanka R, Finlay JA, Nolte KA, Koc J, Jakobi V, Anderson C, Clare AS, Gardner H, Hunsucker KZ, Swain GW, Rosenhahn A. Fouling-Release Properties of Dendritic Polyglycerols against Marine Diatoms. ACS APPLIED MATERIALS & INTERFACES 2018; 10:34965-34973. [PMID: 30248259 DOI: 10.1021/acsami.8b12017] [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
Dendritic polyglycerols (PGs) were grafted onto surfaces using a ring-opening polymerization reaction, and the fouling-release properties against marine organisms were determined. The coatings were characterized by spectroscopic ellipsometry, contact angle goniometry, ATR-FTIR, and stability tests in different aqueous media. A high resistance toward the attachment of different proteins was found. The PG coatings with three different thicknesses were tested in a laboratory assay against the diatom Navicula incerta and in a field assay using a rotating disk. Under static conditions, the PG coatings did not inhibit the initial attachment of diatoms, but up to 94% of attached diatoms could be removed from the coatings after exposure to a shear stress of 19 Pa. Fouling release was found to be enhanced if the coatings were sufficiently thick. The excellent fouling-release properties were supported in dynamic field-immersion experiments in which the samples were continually exposed to a shear stress of 0.18 Pa.
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Affiliation(s)
- Robin Wanka
- Analytical Chemistry - Biointerfaces , Ruhr-University Bochum , 44780 Bochum , Germany
| | - John A Finlay
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Kim A Nolte
- Analytical Chemistry - Biointerfaces , Ruhr-University Bochum , 44780 Bochum , Germany
| | - Julian Koc
- Analytical Chemistry - Biointerfaces , Ruhr-University Bochum , 44780 Bochum , Germany
| | - Victoria Jakobi
- Analytical Chemistry - Biointerfaces , Ruhr-University Bochum , 44780 Bochum , Germany
| | - Charlotte Anderson
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Anthony S Clare
- School of Natural and Environmental Sciences , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Harrison Gardner
- Center for Corrosion and Biofouling Control , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| | - Kelli Z Hunsucker
- Center for Corrosion and Biofouling Control , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| | - Geoffrey W Swain
- Center for Corrosion and Biofouling Control , Florida Institute of Technology , Melbourne , Florida 32901 , United States
| | - Axel Rosenhahn
- Analytical Chemistry - Biointerfaces , Ruhr-University Bochum , 44780 Bochum , Germany
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32
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Affiliation(s)
- Limor Cohen
- Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - David R. Walt
- Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
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33
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Biehl P, Von der Lühe M, Dutz S, Schacher FH. Synthesis, Characterization, and Applications of Magnetic Nanoparticles Featuring Polyzwitterionic Coatings. Polymers (Basel) 2018; 10:E91. [PMID: 30966126 PMCID: PMC6414908 DOI: 10.3390/polym10010091] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/11/2018] [Accepted: 01/12/2018] [Indexed: 01/04/2023] Open
Abstract
Throughout the last decades, magnetic nanoparticles (MNP) have gained tremendous interest in different fields of applications like biomedicine (e.g., magnetic resonance imaging (MRI), drug delivery, hyperthermia), but also more technical applications (e.g., catalysis, waste water treatment) have been pursued. Different surfactants and polymers are extensively used for surface coating of MNP to passivate the surface and avoid or decrease agglomeration, decrease or modulate biomolecule absorption, and in most cases increase dispersion stability. For this purpose, electrostatic or steric repulsion can be exploited and, in that regard, surface charge is the most important (hybrid) particle property. Therefore, polyelectrolytes are of great interest for nanoparticle coating, as they are able to stabilize the particles in dispersion by electrostatic repulsion due to their high charge densities. In this review article, we focus on polyzwitterions as a subclass of polyelectrolytes and their use as coating materials for MNP. In the context of biomedical applications, polyzwitterions are widely used as they exhibit antifouling properties and thus can lead to minimized protein adsorption and also long circulation times.
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Affiliation(s)
- Philip Biehl
- Institute of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany.
- Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany.
| | - Moritz Von der Lühe
- Institute of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany.
- Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany.
| | - Silvio Dutz
- Institute of Biomedical Engineering and Informatics, Technische Universität Ilmenau, 98693 Ilmenau, Germany.
| | - Felix H Schacher
- Institute of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany.
- Jena Center for Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany.
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34
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Lee YK, Yu KJ, Song E, Farimani AB, Vitale F, Xie Z, Yoon Y, Kim Y, Richardson A, Luan H, Wu Y, Xie X, Lucas TH, Crawford K, Mei Y, Feng X, Huang Y, Litt B, Aluru NR, Yin L, Rogers JA. Dissolution of Monocrystalline Silicon Nanomembranes and Their Use as Encapsulation Layers and Electrical Interfaces in Water-Soluble Electronics. ACS NANO 2017; 11:12562-12572. [PMID: 29178798 PMCID: PMC5830089 DOI: 10.1021/acsnano.7b06697] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The chemistry that governs the dissolution of device-grade, monocrystalline silicon nanomembranes into benign end products by hydrolysis serves as the foundation for fully eco/biodegradable classes of high-performance electronics. This paper examines these processes in aqueous solutions with chemical compositions relevant to groundwater and biofluids. The results show that the presence of Si(OH)4 and proteins in these solutions can slow the rates of dissolution and that ion-specific effects associated with Ca2+ can significantly increase these rates. This information allows for effective use of silicon nanomembranes not only as active layers in eco/biodegradable electronics but also as water barriers capable of providing perfect encapsulation until their disappearance by dissolution. The time scales for this encapsulation can be controlled by introduction of dopants into the Si and by addition of oxide layers on the exposed surfaces.The former possibility also allows the doped silicon to serve as an electrical interface for measuring biopotentials, as demonstrated in fully bioresorbable platforms for in vivo neural recordings. This collection of findings is important for further engineering development of water-soluble classes of silicon electronics.
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Affiliation(s)
| | | | - Enming Song
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USADepartment of Materials Science, Fudan University, Shanghai 200433, China
| | | | - Flavia Vitale
- Department of Neurology, Department of Physical Medicine and Rehabilitation, Center for Neuroengineering and Therapeutics, Perelman School of Medicine University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Zhaoqian Xie
- Department of Civil and Environmental Engineering, Mechanical Engineering, and Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA AML, Department of Engineering Mechanics, Center for Mechanics and Materials Tsinghua University, Beijing 100084, China
| | - Younghee Yoon
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yerim Kim
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Andrew Richardson
- Department of Neurosurgery, Center for Neuroengineering and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Haiwen Luan
- Department of Civil and Environmental Engineering, Mechanical Engineering, Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Yixin Wu
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208 USASchool of Materials Science and Engineering, Tsinghua University, Beijing 100084 China
| | - Xu Xie
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
| | - Timothy H. Lucas
- Department of Neurosurgery, Center for Neuroengineering and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kaitlyn Crawford
- Materials Science and Engineering, University of Central Florida, Florida 32816 USA
| | - Yongfeng Mei
- Department of Materials Science, Fudan University, Shanghai 200433, China
| | - Xue Feng
- AML, Department of Engineering Mechanics, Center for Mechanics and Materials, Tsinghua University, Beijing 100084, China
| | - Yonggang Huang
- Department of Civil and Environmental Engineering, Mechanical Engineering, Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Brian Litt
- Department of Neurology, Center for Neuroengineering and Therapeutics, Perelman School of Medicine, Department of Bioengineering, School of Engineering and Applied Sciences, Penn Center for Health, Devices & Technology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Narayana R. Aluru
- Mechanical Science and Engineering, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Lan Yin
- Corresponding Author: To whom correspondence should be addressed. John A. Rogers (), Lan Yin ()
| | - John A. Rogers
- Corresponding Author: To whom correspondence should be addressed. John A. Rogers (), Lan Yin ()
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35
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Zhang C, Luan H, Wang G. A novel thermosensitive triblock copolymer from 100% renewably sourced poly(trimethylene ether) glycol. J Appl Polym Sci 2017. [DOI: 10.1002/app.46112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Cong Zhang
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering; East China University of Science and Technology; Shanghai 200237 China
| | - Huacheng Luan
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering; East China University of Science and Technology; Shanghai 200237 China
| | - Guiyou Wang
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering; East China University of Science and Technology; Shanghai 200237 China
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36
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Pape AC, Ippel BD, Dankers PYW. Cell and Protein Fouling Properties of Polymeric Mixtures Containing Supramolecular Poly(ethylene glycol) Additives. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:4076-4082. [PMID: 28363017 PMCID: PMC5413964 DOI: 10.1021/acs.langmuir.7b00467] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 03/22/2017] [Indexed: 06/01/2023]
Abstract
Fouling properties of new biomaterials are important for the performance of a material in a biological environment. Here, a set of three supramolecular polymeric additives consisting of ureidopyrimidinone (UPy)-functionalized poly(ethylene glycol) (UPyPEG) were formulated with UPy-modified polycaprolactone into thin supramolecular material films. The antifouling properties of these material films were determined by investigation of the relation of cell adhesion and protein adsorption on these materials films. The presence of the UPyPEG additives at the surface of the films was evident by an increased hydrophilicity. Adhesion of human epithelial and endothelial cells was strongly reduced for two of the UPyPEG-containing films. Analysis of adsorption of the first three proteins from the Vroman series, albumin, γ-globulin, and fibrinogen, using quartz crystal microbalance with dissipation in combination with viscoelastic modeling, revealed that the surfaces containing the UPyPEG additives had a limited effect on adsorption of these proteins. Despite a limited reduction of protein adsorption, UPyPEG-containing mixtures were non-cell-adhesive, which shows that non-cell-adhesive properties of supramolecular polymer surfaces are not always directly correlated to protein adsorption.
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Affiliation(s)
- A. C.
H. Pape
- Institute
for Complex Molecular Systems, Laboratory for Chemical Biology, and Laboratory for
Cell and Tissue Engineering, Eindhoven University
of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Bastiaan D. Ippel
- Institute
for Complex Molecular Systems, Laboratory for Chemical Biology, and Laboratory for
Cell and Tissue Engineering, Eindhoven University
of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Patricia Y. W. Dankers
- Institute
for Complex Molecular Systems, Laboratory for Chemical Biology, and Laboratory for
Cell and Tissue Engineering, Eindhoven University
of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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37
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Lange JR, Metzner C, Richter S, Schneider W, Spermann M, Kolb T, Whyte G, Fabry B. Unbiased High-Precision Cell Mechanical Measurements with Microconstrictions. Biophys J 2017; 112:1472-1480. [PMID: 28402889 PMCID: PMC5389962 DOI: 10.1016/j.bpj.2017.02.018] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 01/25/2017] [Accepted: 02/16/2017] [Indexed: 11/16/2022] Open
Abstract
We describe a quantitative, high-precision, high-throughput method for measuring the mechanical properties of cells in suspension with a microfluidic device, and for relating cell mechanical responses to protein expression levels. Using a high-speed (750 fps) charge-coupled device camera, we measure the driving pressure Δp, maximum cell deformation εmax, and entry time tentry of cells in an array of microconstrictions. From these measurements, we estimate population averages of elastic modulus E and fluidity β (the power-law exponent of the cell deformation in response to a step change in pressure). We find that cell elasticity increases with increasing strain εmax according to E ∼ εmax, and with increasing pressure according to E ∼ Δp. Variable cell stress due to driving pressure fluctuations and variable cell strain due to cell size fluctuations therefore cause significant variability between measurements. To reduce measurement variability, we use a histogram matching method that selects and analyzes only those cells from different measurements that have experienced the same pressure and strain. With this method, we investigate the influence of measurement parameters on the resulting cell elastic modulus and fluidity. We find a small but significant softening of cells with increasing time after cell harvesting. Cells harvested from confluent cultures are softer compared to cells harvested from subconfluent cultures. Moreover, cell elastic modulus increases with decreasing concentration of the adhesion-reducing surfactant pluronic. Lastly, we simultaneously measure cell mechanics and fluorescence signals of cells that overexpress the GFP-tagged nuclear envelope protein lamin A. We find a dose-dependent increase in cell elastic modulus and decrease in cell fluidity with increasing lamin A levels. Together, our findings demonstrate that histogram matching of pressure, strain, and protein expression levels greatly reduces the variability between measurements and enables us to reproducibly detect small differences in cell mechanics.
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Affiliation(s)
- Janina R Lange
- Biophysics Group, Department of Physics, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - Claus Metzner
- Biophysics Group, Department of Physics, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - Sebastian Richter
- Biophysics Group, Department of Physics, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - Werner Schneider
- Biophysics Group, Department of Physics, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - Monika Spermann
- Biophysics Group, Department of Physics, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - Thorsten Kolb
- Division of Molecular Genetics, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Graeme Whyte
- IB3: Institute of Biological Chemistry, Biophysics and Bioengineering, Department of Physics, Heriot-Watt University, Edinburgh, United Kingdom
| | - Ben Fabry
- Biophysics Group, Department of Physics, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany.
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38
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Kuliasha CA, Finlay JA, Franco SC, Clare AS, Stafslien SJ, Brennan AB. Marine anti-biofouling efficacy of amphiphilic poly(coacrylate) grafted PDMSe: effect of graft molecular weight. BIOFOULING 2017; 33:252-267. [PMID: 28270054 DOI: 10.1080/08927014.2017.1288807] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 01/25/2017] [Indexed: 06/06/2023]
Abstract
There is currently strong motivation due to ecological concerns to develop effective anti-biofouling coatings that are environmentally benign, durable, and stable for use by the maritime industry. The antifouling (AF) and fouling-release (FR) efficacy of amphiphilic, charged copolymers composed of ~52% acrylamide, ~34% acrylic acid, and ~14% methyl acrylate grafted to poly(dimethyl siloxane) (PDMSe) surfaces were tested against zoospores of the green alga Ulva linza and the diatom Navicula incerta. The biofouling response to molecular weight variation was analyzed for grafts ranging from ~100 to 1,400 kg mol-1, The amphiphilic coatings showed a marked improvement in the FR response, with a 55% increase in the percentage removal of diatoms and increased AF efficacy, with 92% reduction in initial attachment density of zoospores, compared to PDMSe controls. However, graft molecular weight, in the range tested, was statistically insignificant. Grafting copolymers to PDMSe embossed with the Sharklet™ microtopography did not produce enhanced AF efficacy.
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Affiliation(s)
- Cary A Kuliasha
- a Department of Materials Science and Engineering , University of Florida , Gainesville , FL , USA
| | - John A Finlay
- b School of Marine Science and Technology , Newcastle University , Newcastle-upon-Tyne , UK
| | - Sofia C Franco
- b School of Marine Science and Technology , Newcastle University , Newcastle-upon-Tyne , UK
| | - Anthony S Clare
- b School of Marine Science and Technology , Newcastle University , Newcastle-upon-Tyne , UK
| | - Shane J Stafslien
- c Office of Research and Creative Activity , North Dakota State University , Fargo , ND , USA
| | - Anthony B Brennan
- a Department of Materials Science and Engineering , University of Florida , Gainesville , FL , USA
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Mahmoudi N, Reed L, Moix A, Alshammari N, Hestekin J, Servoss SL. PEG-mimetic peptoid reduces protein fouling of polysulfone hollow fibers. Colloids Surf B Biointerfaces 2017; 149:23-29. [DOI: 10.1016/j.colsurfb.2016.09.038] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Revised: 09/20/2016] [Accepted: 09/26/2016] [Indexed: 01/15/2023]
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40
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Friis JE, Brøns K, Salmi Z, Shimizu K, Subbiahdoss G, Holm AH, Santos O, Pedersen SU, Meyer RL, Daasbjerg K, Iruthayaraj J. Hydrophilic Polymer Brush Layers on Stainless Steel Using Multilayered ATRP Initiator Layer. ACS APPLIED MATERIALS & INTERFACES 2016; 8:30616-30627. [PMID: 27792314 DOI: 10.1021/acsami.6b10466] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Thin polymer coatings (in tens of nanometers to a micron thick) are desired on industrial surfaces such as stainless steel. In this thickness range coatings are difficult to produce using conventional methods. In this context, surface-initiated controlled polymerization method can offer a promising tool to produce thin polymer coatings via bottom-up approach. Furthermore, the industrial surfaces are chemically heterogeneous and exhibit surface features in the form of grain boundaries and grain surfaces. Therefore, the thin coatings must be equally effective on both the grain surfaces and the grain boundary regions. This study illustrates a novel "periodic rejuvenation of surface initiation" process using surface-initiated ATRP technique to amplify the graft density of poly(oligoethylene glycol)methacrylate (POEGMA) brush layers on stainless steel 316L surface. The optimized conditions demonstrate a controlled, macroscopically homogeneous, and stable POEGMA brush layer covering both the grain surface and the grain boundary region. Various relevant parameters-surface cleaning methods, controllability of thickness, graft density, homogeneity and stability-were studied using techniques such as ellipsometer, X-ray photoelectron spectroscopy, scanning electron microscopy-energy-dispersive X-ray, surface zeta potential, and infrared reflection-adsorption spectroscopy.
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Affiliation(s)
- Jakob Ege Friis
- Department of Biological and Chemical Engineering, Aarhus University , Hangøvej 2, DK-8200 Aarhus N, Denmark
| | - Kaare Brøns
- Department of Biological and Chemical Engineering, Aarhus University , Hangøvej 2, DK-8200 Aarhus N, Denmark
| | - Zakaria Salmi
- Department of Chemistry, Aarhus University , Langelandsgade 140, DK-8000 Aarhus C, Denmark
| | - Kyoko Shimizu
- SACHEM Japan GK 5-6-27 Mizuhai, Higashi Osaka 578-0921, Japan
| | - Guruprakash Subbiahdoss
- Interdisciplinary Nanoscience Center, Aarhus Univeristy , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Allan Hjarbæk Holm
- Grundfos Holding A/S , Poul Due Jensens Vej 7, DK-8850 Bjerringbro, Denmark
| | - Olga Santos
- Materials and Chemistry Center, Alfa Laval Lund AB , P.O. Box 74, SE-22100 Lund, Sweden
| | - Steen Uttrup Pedersen
- Department of Chemistry, Aarhus University , Langelandsgade 140, DK-8000 Aarhus C, Denmark
- Interdisciplinary Nanoscience Center, Aarhus Univeristy , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Rikke Louise Meyer
- Department of Bioscience, Aarhus University , Ny Munkegade 116, DK-8000 Aarhus C, Denmark
- Interdisciplinary Nanoscience Center, Aarhus Univeristy , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Kim Daasbjerg
- Department of Chemistry, Aarhus University , Langelandsgade 140, DK-8000 Aarhus C, Denmark
- Interdisciplinary Nanoscience Center, Aarhus Univeristy , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
- Applied Physical Chemistry, KTH Royal Institute of Technology , SE-10044 Stockholm, Sweden
- Carbon Dioxide Activation Center , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Joseph Iruthayaraj
- Department of Biological and Chemical Engineering, Aarhus University , Hangøvej 2, DK-8200 Aarhus N, Denmark
- Interdisciplinary Nanoscience Center, Aarhus Univeristy , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
- Carbon Dioxide Activation Center , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
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41
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Cui X, Koujima Y, Seto H, Murakami T, Hoshino Y, Miura Y. Inhibition of Bacterial Adhesion on Hydroxyapatite Model Teeth by Surface Modification with PEGMA-Phosmer Copolymers. ACS Biomater Sci Eng 2016; 2:205-212. [DOI: 10.1021/acsbiomaterials.5b00349] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Xinnan Cui
- Department
of Chemical Engineering, Graduate School of Engineering, Kyushu University 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yuki Koujima
- Department
of Chemical Engineering, Graduate School of Engineering, Kyushu University 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hirokazu Seto
- Department
of Chemical Engineering, Graduate School of Engineering, Kyushu University 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Tatsuya Murakami
- Center
for Nano Materials and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Yu Hoshino
- Department
of Chemical Engineering, Graduate School of Engineering, Kyushu University 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yoshiko Miura
- Department
of Chemical Engineering, Graduate School of Engineering, Kyushu University 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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42
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Tsiamantas C, Dawson SJ, Huc I. Solid phase synthesis of oligoethylene glycol-functionalized quinolinecarboxamide foldamers with enhanced solubility properties. CR CHIM 2016. [DOI: 10.1016/j.crci.2015.06.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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43
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Langdon BB, Kastantin M, Schwartz DK. Surface Chemistry Influences Interfacial Fibrinogen Self-Association. Biomacromolecules 2015; 16:3201-8. [DOI: 10.1021/acs.biomac.5b00869] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Blake B. Langdon
- Department of Chemical and
Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Mark Kastantin
- Department of Chemical and
Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Daniel K. Schwartz
- Department of Chemical and
Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
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44
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Baranowska M, Slota AJ, Eravuchira PJ, Alba M, Formentin P, Pallarès J, Ferré-Borrull J, Marsal LF. Protein attachment to silane-functionalized porous silicon: A comparison of electrostatic and covalent attachment. J Colloid Interface Sci 2015; 452:180-189. [PMID: 25942096 DOI: 10.1016/j.jcis.2015.04.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 04/09/2015] [Accepted: 04/14/2015] [Indexed: 12/31/2022]
Abstract
Porous silicon (pSi) is a prosperous biomaterial, biocompatible, and biodegradable. Obtaining regularly functionalized pSi surfaces is required in many biotechnology applications. Silane-PEG-NHS (triethoxysilane-polyethylene-glycol-N-hydroxysuccinimide) is useful for single-molecule studies due to its ability to attach to only one biomolecule. We investigate the functionalization of pSi with silane-PEG-NHS and compare it with two common grafting agents: APTMS (3-aminopropylotrimethoxysilane) as electrostatic linker, and APTMS modified with glutaraldehyde as covalent spacer. We show the arrangement of two proteins (collagen and bovine serum albumin) as a function of the functionalization and of the pore size. FTIR is used to demonstrate correct functionalization while fluorescence confocal microscopy reveals that silane-PEG-NHS results in a more uniform protein distribution. Reflection interference spectroscopy (RIfS) is used to estimate the attachment of linker and proteins. The results open a way to obtain homogenous chemical modified silicon supports with a great value in biosensing, drug delivery and cell biology.
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Affiliation(s)
- Malgorzata Baranowska
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Agata J Slota
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Pinkie J Eravuchira
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Maria Alba
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Pilar Formentin
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Josep Pallarès
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain
| | - Josep Ferré-Borrull
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain.
| | - Lluís F Marsal
- Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona 43007, Spain.
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45
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Functionalizable low-fouling coatings for label-free biosensing in complex biological media: advances and applications. Anal Bioanal Chem 2015; 407:3927-53. [DOI: 10.1007/s00216-015-8606-5] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Revised: 02/20/2015] [Accepted: 02/27/2015] [Indexed: 12/31/2022]
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46
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Gutowski SM, Shoemaker JT, Templeman KL, Wei Y, Latour RA, Bellamkonda RV, LaPlaca MC, García AJ. Protease-degradable PEG-maleimide coating with on-demand release of IL-1Ra to improve tissue response to neural electrodes. Biomaterials 2015; 44:55-70. [PMID: 25617126 DOI: 10.1016/j.biomaterials.2014.12.009] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Revised: 12/01/2014] [Accepted: 12/16/2014] [Indexed: 01/18/2023]
Abstract
Neural electrodes are an important part of brain-machine interface devices that can restore functionality to patients with sensory and movement disorders. Chronically implanted neural electrodes induce an unfavorable tissue response which includes inflammation, scar formation, and neuronal cell death, eventually causing loss of electrode function. We developed a poly(ethylene glycol) hydrogel coating for neural electrodes with non-fouling characteristics, incorporated an anti-inflammatory agent, and engineered a stimulus-responsive degradable portion for on-demand release of the anti-inflammatory agent in response to inflammatory stimuli. This coating reduces in vitro glial cell adhesion, cell spreading, and cytokine release compared to uncoated controls. We also analyzed the in vivo tissue response using immunohistochemistry and microarray qRT-PCR. Although no differences were observed among coated and uncoated electrodes for inflammatory cell markers, lower IgG penetration into the tissue around PEG+IL-1Ra coated electrodes indicates an improvement in blood-brain barrier integrity. Gene expression analysis showed higher expression of IL-6 and MMP-2 around PEG+IL-1Ra samples, as well as an increase in CNTF expression, an important marker for neuronal survival. Importantly, increased neuronal survival around coated electrodes compared to uncoated controls was observed. Collectively, these results indicate promising findings for an engineered coating to increase neuronal survival and improve tissue response around implanted neural electrodes.
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Affiliation(s)
- Stacie M Gutowski
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA; Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA
| | - James T Shoemaker
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA; Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA
| | - Kellie L Templeman
- Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA; Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Yang Wei
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - Robert A Latour
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - Ravi V Bellamkonda
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA; Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA
| | - Michelle C LaPlaca
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA; Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA
| | - Andrés J García
- Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA; Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
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47
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Li Y, Sheiko SS. Molecular Mechanochemistry: Engineering and Implications of Inherently Strained Architectures. Top Curr Chem (Cham) 2015; 369:1-36. [PMID: 25805145 DOI: 10.1007/128_2015_627] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Mechanical activation of chemical bonds is usually achieved by applying external forces. However, nearly all molecules exhibit inherent strain of their chemical bonds and angles as a result of constraints imposed by covalent bonding and interactions with the surrounding environment. Particularly strong deformation of bonds and angles is observed in hyperbranched macromolecules caused by steric repulsion of densely grafted polymer branches. In addition to the tension amplification, macromolecular architecture allows for accurate control of strain distribution, which enables focusing of the internal mechanical tension to specific chemical bonds and angles. As such, chemically identical bonds in self-strained macromolecules become physically distinct because the difference in bond tension leads to the corresponding difference in the electronic structure and chemical reactivity of individual bonds within the same macromolecule. In this review, we outline different approaches to the design of strained macromolecules along with physical principles of tension management, including generation, amplification, and focusing of mechanical tension at specific chemical bonds.
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Affiliation(s)
- Yuanchao Li
- Department of Chemistry, University of North Carolina, Chapel Hill, NC, 27599-3290, USA
| | - Sergei S Sheiko
- Department of Chemistry, University of North Carolina, Chapel Hill, NC, 27599-3290, USA.
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48
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Huang Q, Yoon I, Villanueva J, Kim K, Sirbuly DJ. Quantitative mechanical analysis of thin compressible polymer monolayers on oxide surfaces. SOFT MATTER 2014; 10:8001-8010. [PMID: 25157609 DOI: 10.1039/c4sm01530d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A clear understanding of the mechanical behavior of nanometer thick films on nanostructures, as well as developing versatile approaches to characterize their mechanical properties, are of great importance and may serve as the foundation for understanding and controlling molecular interactions at the interface of nanostructures. Here we report on the synthesis of thin, compressible polyethylene glycol (PEG) monolayers with a wet thickness of <20 nm on tin dioxide (SnO2) nanofibers through silane-based chemistries. Nanomechanical properties of such thin PEG films were extensively investigated using atomic force microscopy (AFM). In addition, tip-sample interactions were carefully studied, with different AFM tip modifications (i.e., hydrophilic and hydrophobic) and in different ionic solutions. We find that the steric forces dominate the tip-sample interactions when the polymer film is immersed in solution with salt concentrations similar to biological media (e.g., 1x phosphate buffer solution), while van der Waals and electrostatic forces have minimal contributions. A Dimitriadis thin film polymer compression model shows that the linear elastic regime is reproducible in the initial 50% indentation of these films which have tunable Young's moduli ranging from 5 MPa for the low molecular weight films to 700 kPa for the high molecular weight PEG films. Results are compared with the same PEG films deposited on silicon substrates which helped quantify the structural properties and understand the relationship between the structural and the mechanical properties of PEG films on the SnO2 fibers.
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Affiliation(s)
- Qian Huang
- Department of NanoEngineering, University of California, La Jolla, San Diego, CA 92093, USA.
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49
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Sterner O, Giazzon M, Zürcher S, Tosatti S, Liley M, Spencer ND. Delineating fibronectin bioadhesive micropatterns by photochemical immobilization of polystyrene and poly(vinylpyrrolidone). ACS APPLIED MATERIALS & INTERFACES 2014; 6:18683-18692. [PMID: 25253530 DOI: 10.1021/am5042093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Bioadhesive micropatterns, capable of laterally confining cells to a 2D lattice, have proven effective in simulating the in vivo tissue environment. They reveal fundamental aspects of the role of adhesion in cell mechanics, proliferation, and differentiation. Here we present an approach based on photochemistry for the fabrication of synthetic polymer micropatterns. Perfluorophenyl azide (PFPA), upon deep-UV exposure, forms a reactive nitrene capable of covalently linking to a molecule that is in close proximity. PFPA has been grafted onto a backbone of poly(allyl amine), which readily forms a self-assembled monolayer on silicon wafers or glass. A film of polystyrene was applied by spin-coating, and by laterally confining the UV exposure through a chromium-on-quartz photomask, monolayers of polymers could be immobilized in circular microdomains. Poly(vinylpyrrolidone) (PVP) was attached to the background to form a barrier to nonspecific protein adsorption and cell adhesion. Micropatterns were characterized with high-lateral-resolution time-of-flight secondary ion mass spectrometry (TOF-SIMS), which confirmed the formation of polystyrene domains within a PVP background. Fluorescence-microscopy adsorption assays with rhodamine-labeled bovine serum albumin demonstrated the nonfouling efficiency of PVP and, combined with TOF-SIMS, allowed for a comprehensive characterization of the pattern geometry. The applicability of the micropatterned platform in single-cell assays was tested by culturing two cell types, WM 239 melanoma cells and SaOs-2 osteoblasts, on micropatterned glass, either with or without backfilling of the patterns with fibronectin. It was demonstrated that the platform was efficient in confining cells to the fibronectin-backfilled micropatterns for at least 48 h. PVP is thus proposed as a viable, highly stable alternative to poly(ethylene glycol) for nonfouling applications. Due to the versatility of the nitrene-insertion reaction, the platform could be extended to other polymer pairs or proteins and the surface chemistry adapted to specific applications.
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Affiliation(s)
- Olof Sterner
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, CH-8093, Zürich, Switzerland
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50
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Röttgermann PJF, Hertrich S, Berts I, Albert M, Segerer FJ, Moulin JF, Nickel B, Rädler JO. Cell Motility on Polyethylene Glycol Block Copolymers Correlates to Fibronectin Surface Adsorption. Macromol Biosci 2014; 14:1755-63. [DOI: 10.1002/mabi.201400246] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 08/13/2014] [Indexed: 01/27/2023]
Affiliation(s)
- Peter J. F. Röttgermann
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Samira Hertrich
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Ida Berts
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Max Albert
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Felix J. Segerer
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Jean-François Moulin
- Helmholtz Zentrum Geesthacht; Institut für Werkstoffforschung; FRM II; Lichtenbergstr. 1 85747 Garching Germany
| | - Bert Nickel
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Joachim O. Rädler
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
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