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Trovagunta R, Marquez R, Tolosa L, Barrios N, Zambrano F, Suarez A, Pal L, Gonzalez R, Hubbe MA. Lignin self-assembly phenomena and valorization strategies for pulping, biorefining, and materials development: Part 1. The physical chemistry of lignin self-assembly. Adv Colloid Interface Sci 2024; 332:103247. [PMID: 39126917 DOI: 10.1016/j.cis.2024.103247] [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: 03/01/2024] [Revised: 07/08/2024] [Accepted: 07/09/2024] [Indexed: 08/12/2024]
Abstract
Physical chemistry aspects are emphasized in this comprehensive review of self-assembly phenomena involving lignin in various forms. Attention to this topic is justified by the very high availability, low cost, and renewable nature of lignin, together with opportunities to manufacture diverse products, for instance, polymers/resins, bioplastics, carbon fibers, bio-asphalt, sunscreen components, hydrophobic layers, and microcapsules. The colloidal lignin material, nanoparticles, and microstructures that can be formed as a result of changes in solvent properties, pH, or other adjustments to a suspending medium have been shown to depend on many factors. Such factors are examined in this work based on the concepts of self-assembly, which can be defined as an organizing principle dependent on specific attributes of the starting entities themselves. As a means to promote such concepts and to facilitate further development of nano-scale lignin products, this article draws upon evidence from a wide range of studies. These include investigations of many different plant sources of lignin, processes of delignification, solvent systems, anti-solvent systems or other means of achieving phase separation, and diverse means of achieving colloidal stability (if desired) of resulting self-assembled lignin structures. Knowledge of the self-organization behavior of lignin can provide significant structural information to optimize the use of lignin in value-added applications. Examples include chemical conditions and preparation procedures in which lignin-related compounds of particles organize themselves as spheres, hollow spheres, surface-bound layers, and a variety of other structures. Published articles show that such processes can be influenced by the selection of lignin type, pulping or extraction processes, functional groups such as phenolic, carboxyl, and sulfonate, chemical derivatization reactions, solvent applications, aqueous conditions, and physical processes, such as agitation. Precipitation from non-aqueous solutions represents a key focus of lignin self-assembly research. The review also considers stabilization mechanisms of self-assembled lignin-related structures.
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Affiliation(s)
| | - Ronald Marquez
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA
| | - Laura Tolosa
- School of Chemical Engineering, Universidad de Los Andes, Mérida, Venezuela
| | - Nelson Barrios
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA
| | | | - Antonio Suarez
- WestRock Company, 2742 Charles City Rd, Richmond, VA 23231, USA
| | - Lokendra Pal
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA
| | - Ronalds Gonzalez
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA
| | - Martin A Hubbe
- Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA.
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2
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Martínez-Camarena Á, Bellia F, Paz Clares M, Vecchio G, Nicolas J, García-España E. Polymeric Nanozyme with SOD Activity Capable of Inhibiting Self- and Metal-Induced α-Synuclein Aggregation. Chemistry 2024; 30:e202401331. [PMID: 38687026 DOI: 10.1002/chem.202401331] [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: 04/03/2024] [Revised: 04/29/2024] [Accepted: 04/30/2024] [Indexed: 05/02/2024]
Abstract
Despite decades of research, Parkinson's disease is still an idiopathic pathology for which no cure has yet been found. This is partly explained by the multifactorial character of most neurodegenerative syndromes, whose generation involves multiple pathogenic factors. In Parkinson's disease, two of the most important ones are the aggregation of α-synuclein and oxidative stress. In this work, we address both issues by synthesizing a multifunctional nanozyme based on grafting a pyridinophane ligand that can strongly coordinate CuII, onto biodegradable PEGylated polyester nanoparticles. The resulting nanozyme exhibits remarkable superoxide dismutase activity together with the ability to inhibit the self-induced aggregation of α-synuclein into amyloid-type fibrils. Furthermore, the combination of the chelator and the polymer produces a cooperative effect whereby the resulting nanozyme can also halve CuII-induced α-synuclein aggregation.
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Affiliation(s)
- Álvaro Martínez-Camarena
- ICMol, Departament de Química Inorgànica, Universitat de València, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
- Institut Galien Paris-Saclay, CNRS, Université Paris-Saclay, Orsay, 91400, France
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale A. Doria 6, Catania, 95125, Italy
- MatMoPol Research Group, Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, Madrid, 28040, Spain
| | - Francesco Bellia
- Istituto di Cristallografia, CNR, P. Gaifami 18, Catania, 95126, Italy
| | - M Paz Clares
- ICMol, Departament de Química Inorgànica, Universitat de València, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
| | - Graziella Vecchio
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale A. Doria 6, Catania, 95125, Italy
| | - Julien Nicolas
- Institut Galien Paris-Saclay, CNRS, Université Paris-Saclay, Orsay, 91400, France
| | - Enrique García-España
- ICMol, Departament de Química Inorgànica, Universitat de València, C/Catedrático José Beltrán 2, Paterna, 46980, Spain
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Madhavan N, Deshpande AP, Mani E, Basavaraj MG. Electrostatic Heteroaggregation: Fundamentals and Applications in Interfacial Engineering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2112-2134. [PMID: 36727572 DOI: 10.1021/acs.langmuir.2c02681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The aggregation of oppositely charged soft materials (particles, surfactants, polyelectrolytes, etc.) that differ in one or more physical or chemical attributes, broadly referred to as electrostatic heteroaggregation, has been an active area of research for several decades now. While electrostatic heteroaggregation (EHA) is relevant to diverse fields such as environmental engineering, food technology, and pharmaceutical formulations, more recently there has been a resurgence to explore various aspects of this phenomenon in the context of interface stabilization and the development of functional materials. In this Feature Article, we provide an overview of the recent contributions of our group to this exciting field with particular emphasis on fundamental studies of electrostatic heteroaggregation between oppositely charged systems in the bulk, at interfaces, and across the bulk/interface. The influence of the size and shape of particles and the surface charge of heteroaggregates on the formation of Pickering emulsions and their utilization in the development of porous ceramics is discussed.
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Affiliation(s)
- Nithin Madhavan
- Polymer Engineering and Colloid Sciences Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, IIT P.O., Chennai600036, India
| | - Abhijit P Deshpande
- Polymer Engineering and Colloid Sciences Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, IIT P.O., Chennai600036, India
| | - Ethayaraja Mani
- Polymer Engineering and Colloid Sciences Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, IIT P.O., Chennai600036, India
| | - Madivala G Basavaraj
- Polymer Engineering and Colloid Sciences Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, IIT P.O., Chennai600036, India
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4
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Li J, Yang X, Yuan L, Li Z, Zeng Y, Shen H. The molecular dynamics during gelation of resorcinol and formaldehyde as studied by dielectric relaxation. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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5
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Bruch D, Balzer C, Wang ZG. Thermodynamics of Electrolyte Solutions Near Charged Surfaces: Constant Surface Charge vs. Constant Surface Potential. J Chem Phys 2022; 156:174704. [DOI: 10.1063/5.0089260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Electric double layers are ubiquitous in science and engineering and are of current interest, owing to their applications in the stabilization of colloidal suspensions and as supercapacitors. While the structure and properties of electric double layers in electrolyte solutions near a charged surface are well characterized, there are subtleties in calculating thermodynamic properties from the free energy of a system with charged surfaces. These subtleties arise from the difference in the free energy between systems with constant surface charge and constant surface potential. In this work, we present a systematic, pedagogical framework to properly account for the different specifications on charged bodies in electrolyte solutions. Our approach is fully variational---that is, all free energies, boundary conditions, relevant electrostatic equations, and thermodynamic quantities are systematically derived using variational principles of thermodynamics. We illustrate our approach by considering a simple electrolyte solution between two charged surfaces using the Poisson--Boltzmann theory. Our results highlight the importance of using the proper thermodynamic potential and provide a general framework for calculating thermodynamic properties of electrolyte solutions near charged surfaces. Specifically, we present the calculation of the pressure and the surface tension between two charged surfaces for different boundary conditions, including mixed boundary conditions.
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Affiliation(s)
- Dorian Bruch
- Chemistry and Chemical Engineering, California Institute of Technology Division of Chemistry and Chemical Engineering, United States of America
| | | | - Zhen-Gang Wang
- Division of Chemistry and Chemical Engineering, California Institute of Technology, United States of America
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6
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A study of effects of the non-DLVO interparticle interactions on aggregation rate. Colloid Polym Sci 2022. [DOI: 10.1007/s00396-022-04955-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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7
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SUZUKI Y, MIZUHATA M. Predictive Zeta Potential Measurement Method Applicable to Nonaqueous Solvents in High-concentration Dispersion Systems for the System of LiClO<sub>4</sub>–Propylene Carbonate Solution and LiCoO<sub>2</sub> Powder Sheet. ELECTROCHEMISTRY 2022. [DOI: 10.5796/electrochemistry.22-66050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Yoshimasa SUZUKI
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University
| | - Minoru MIZUHATA
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University
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Rathee V, Monti A, Rosti ME, Shen AQ. Shear thickening behavior in dense repulsive and attractive suspensions of hard spheres. SOFT MATTER 2021; 17:8047-8058. [PMID: 34525164 DOI: 10.1039/d1sm00971k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Shear thickening in stable dense colloidal suspensions is a reversible phenomenon and no hysteresis is observed in the flow curve measurements. However, a reduction in the stability of colloids promotes particle aggregation and introduces a time dependent rheological response. In this work, by using a model colloidal system of hard spherical silica particles (average diameter of 415 nm) with varying particle volume fractions 0.2 ≤ ϕ ≤ 0.56, we study the effect of particle stability on the hysteresis of the shear thickening behavior of these suspensions. The particle stability is manipulated by adding a simple monovalent salt (sodium chloride) in the silica suspension with varying concentrations α ∈ [0,0.5] M. For repulsive and weakly attractive suspensions, the flow behavior is history independent and the shear thickening behavior does not exhibit hysteresis. However, significant hysteresis is observed in rheological measurements for strongly attractive suspensions, with shear history playing a critical role due to the dynamic nature of particle clusters, resulting in time dependent hysteresis behavior. By performing numerical simulations, we find that this hysteresis behavior arises due to the competition among shear, electrostatic repulsive, van der Waals attractive, and frictional contact forces. The critical shear stress (i.e., the onset of shear thickening) decreases with increasing salt concentrations, which can be captured by a scaling relationship based on the force balance between particle-particle contact force and electrostatic repulsive force. Our combined experimental and simulation results imply the formation of particle contacts in our sheared suspensions.
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Affiliation(s)
- Vikram Rathee
- Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan.
| | - Alessandro Monti
- Complex Fluids and Flows Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan
| | - Marco E Rosti
- Complex Fluids and Flows Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan
| | - Amy Q Shen
- Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan.
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9
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Itami T, Hashidzume A, Kamon Y, Yamaguchi H, Harada A. The macroscopic shape of assemblies formed from microparticles based on host-guest interaction dependent on the guest content. Sci Rep 2021; 11:6320. [PMID: 33737714 PMCID: PMC7973530 DOI: 10.1038/s41598-021-85816-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 03/08/2021] [Indexed: 11/08/2022] Open
Abstract
Biological macroscopic assemblies have inspired researchers to utilize molecular recognition to develop smart materials in these decades. Recently, macroscopic self-assemblies based on molecular recognition have been realized using millimeter-scale hydrogel pieces possessing molecular recognition moieties. During the study on macroscopic self-assembly based on molecular recognition, we noticed that the shape of assemblies might be dependent on the host-guest pair. In this study, we were thus motivated to study the macroscopic shape of assemblies formed through host-guest interaction. We modified crosslinked poly(sodium acrylate) microparticles, i.e., superabsorbent polymer (SAP) microparticles, with β-cyclodextrin (βCD) and adamantyl (Ad) residues (βCD(x)-SAP and Ad(y)-SAP microparticles, respectively, where x and y denote the mol% contents of βCD and Ad residues). Then, we studied the self-assembly behavior of βCD(x)-SAP and Ad(y)-SAP microparticles through the complexation of βCD with Ad residues. There was a threshold of the βCD content in βCD(x)-SAP microparticles for assembly formation between x = 22.3 and 26.7. On the other hand, the shape of assemblies was dependent on the Ad content, y; More elongated assemblies were formed at a higher y. This may be because, at a higher y, small clusters formed in an early stage can stick together even upon collisions at a single contact point to form elongated aggregates, whereas, at a smaller y, small clusters stick together only upon collisions at multiple contact points to give rather circular assemblies. On the basis of these observations, the shape of assembly formed from microparticles can be controlled by varying y.
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Affiliation(s)
- Takahiro Itami
- Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, 560-0043, Japan
| | - Akihito Hashidzume
- Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, 560-0043, Japan.
| | - Yuri Kamon
- Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, 560-0043, Japan
| | - Hiroyasu Yamaguchi
- Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, 560-0043, Japan
| | - Akira Harada
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan.
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10
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Corder RD, Adhikari P, Burroughs MC, Rojas OJ, Khan SA. Cellulose nanocrystals for gelation and percolation-induced reinforcement of a photocurable poly(vinyl alcohol) derivative. SOFT MATTER 2020; 16:8602-8611. [PMID: 32845269 DOI: 10.1039/d0sm01376e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Nanomaterials are regularly added to crosslinkable polymers to enhance mechanical properties; however, important effects related to gelation behavior and crosslinking kinetics are often overlooked. In this study, we combine cellulose nanocrystals (CNCs) with a photoactive poly(vinyl alcohol) derivative, PVA-SbQ, to form photocrosslinked nanocomposite hydrogels. We investigate the rheology of PVA-SbQ with and without CNCs to decipher the role of each component in final property development and identify a critical CNC concentration (1.5 wt%) above which several changes in rheological behavior are observed. Neat PVA-SbQ solutions exhibit Newtonian flow behavior across all concentrations, while CNC dispersions are shear-thinning <6 wt% and gel at high concentrations. Combining semi-dilute entangled PVA-SbQ (6 wt%) with >1.5 wt% CNCs forms a percolated microstructure. In situ photocrosslinking experiments reveal how CNCs affect both the gelation kinetics and storage modulus (G') of the resulting hydrogels. The modulus crossover time increases after addition of up to 1.5 wt% CNCs, while no modulus crossover is observed >1.5 wt% CNCs. A sharp increase in G' is observed >1.5 wt% CNCs for fully-crosslinked networks due to favorable PVA-SbQ/CNC interactions. A percolation model is fitted to the G' data to confirm that mechanical percolation is maintained after photocrosslinking. A ∼120% increase in G' for 2.5 wt% CNCs (relative to neat PVA-SbQ) confirms that CNCs provide a reinforcing effect through the percolated microstructure formed from PVA-SbQ/CNC interactions. The results are testament to the ability of CNCs to significantly alter the storage moduli of crosslinked polymer gels at low loading fractions through percolation-induced reinforcement.
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Affiliation(s)
- Ria D Corder
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA.
| | - Prajesh Adhikari
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA.
| | - Michael C Burroughs
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA.
| | - Orlando J Rojas
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA. and Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Espoo, FI-00076, Finland and Bioproducts Institute, Department of Chemical and Biological Engineering, Chemistry and Wood Science, University of British Columbia, Vancouver BC V6T 1Z3, Canada.
| | - Saad A Khan
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA.
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11
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Wu C, Wang J, Na X, Wang Z, Xu X, Wang T. Inducing secondary structural interplays between scallop muscle proteins and soy proteins to form soluble composites. Food Funct 2020; 11:3351-3360. [PMID: 32226997 DOI: 10.1039/c9fo03106e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Developing food protein structures with the freedom to tune their internal molecular arrangements is a fascinating aspect for serving the demands of multifunctional food components. However, a protein's conformation is highly submissive to its amino acid sequences, posing a great limitation on controlling its structural rearrangements. In this study, based on simply co-dissolving scallop muscle proteins (SMPs, water-insoluble) and soya proteins (SPs) at pH 12 prior to neutralization, the unfolding-folding pathways of both proteins were altered. Structural characterizations evidenced the complexation of SMPs and SPs using their secondary structures as the building blocks. Due to hydrophobic coalition between the α-helix (from SMPs) and β-sheet (from SPs), the co-assembled structures obtained considerable resistance against folding triggered by the hydrophobic effect. In addition, the kinetics by which the SMPs and SPs folded together was tailor-made by the compositional differences of the two proteins, resulting in the formation of well-defined, water-dispersible nanospheres with a tunable size and internal arrangements of the backbones. This study would enrich our choice of manipulated protein structures and enlarge the available protein sources with tailorable functions when applied in specific scenarios.
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Affiliation(s)
- Chao Wu
- National Engineering Research Centre of Seafood, Collaborative Innovation Centre of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian, 116034, China.
| | - Jiamei Wang
- National Engineering Research Centre of Seafood, Collaborative Innovation Centre of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian, 116034, China.
| | - Xiaokang Na
- National Engineering Research Centre of Seafood, Collaborative Innovation Centre of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian, 116034, China.
| | - Zhenyu Wang
- National Engineering Research Centre of Seafood, Collaborative Innovation Centre of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian, 116034, China.
| | - Xianbing Xu
- National Engineering Research Centre of Seafood, Collaborative Innovation Centre of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian, 116034, China.
| | - Tao Wang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education; National Engineering Laboratory for Cereal Fermentation Technology; Jiangsu Provincial Research Centre for Bioactive Product Processing Technology, and School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
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12
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Li C, Wu Y, Li G, Zhang Y, Ma X, Fang Y, Li W, Tian Z. Aggregation Behavior of Acylated Pepsin-Solubilized Collagen Based on Fluorescence Spectrum Technology. APPLIED SPECTROSCOPY 2020; 74:391-399. [PMID: 32031012 DOI: 10.1177/0003702820903817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The aggregation behavior of collagen-based materials plays an important role in their processing because it could affect their physicochemical properties. Based on the intrinsic fluorescence characteristic of tyrosine, fluorescence spectrum technology was used to investigate the aggregation state of the acylated collagen molecules in aqueous solution. The results showed that the aggregate degree of the acylated collagen was higher than that of the native collagen due to the hydrophobic interaction. With the increase of concentrations of the acylated collagen or at NaCl higher than 40 mmol/L, the aggregate degree of the acylated collagen molecules increased. When the pH was close to the isoelectric point of the acylated collagen, the hydrophobic interaction and the hydrogen bond helped to increase the aggregation degree. However, with the increase of temperature (10-70 ℃), the aggregation state of the acylated collagen decreased gradually due to the quenching, the molecular collision, and the broken of hydrogen bonds. Furthermore, two-dimensional correlation spectroscopy (2D-COS) showed that the response order was 360 > 305 nm at various acylated collagen and NaCl (>40 mmol/L) concentrations, while the response order was 305 > 360 nm when the pH value was increased from 5.0 to 9.0. Temperature-dependent 2D-COS showed there were four bands that occurred and the response order was listed as follows: 293 > 305 > 360 > 420 nm. In brief, the results might provide an important guide for molding processes of the acylated collagen.
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Affiliation(s)
- Conghu Li
- The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, China
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Yan Wu
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Guoying Li
- The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, China
| | - Ying Zhang
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Xinghong Ma
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Yifan Fang
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Wenjuan Li
- College of Life Sciences, Anqing Normal University, Anqing, China
| | - Zhenhua Tian
- College of Bioresources Chemical and Materials Engineering, Shanxi University of Science and Technology, Xi'an, China
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13
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Gericke M, Schulze P, Heinze T. Nanoparticles Based on Hydrophobic Polysaccharide Derivatives-Formation Principles, Characterization Techniques, and Biomedical Applications. Macromol Biosci 2020; 20:e1900415. [PMID: 32090505 DOI: 10.1002/mabi.201900415] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/09/2020] [Indexed: 12/13/2022]
Abstract
Polysaccharide (PS) nanoparticles (NP) are fascinating materials that combine huge application potential with the unique beneficial features of natural biopolymers. Different types of PS-NP can be distinguished depending on the basic preparation principles (top-down vs bottom-up vs coating of nanomaterials) and the material from which they are obtained (native PS vs chemically modified PS derivatives vs nanocomposites). This review provides a comprehensive overview of an approach towards PS-NP that has gained rapidly increasing interest within the last decade; the nanoself-assembling of hydrophobic PS derivatives. This facile process is easy to perform and offers a broad structural diversity in terms of the PS backbone and the additional functionalities that can be introduced. Fundamental principles of different NP preparation techniques along with useful characterization methods are presented in this work. A comprehensive summary of PS-NP prepared by different techniques and with various PS backbones and types/amounts of hydrophobic substituents is given. The intention is to demonstrate how different parameters determine the size, size distribution, and zeta-potential of the particles. Moreover, application trends in biomedical areas are highlighted in which tailored functional PS-NP are evaluated and constantly developed further.
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Affiliation(s)
- Martin Gericke
- Centre of Excellence for Polysaccharide Research, Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstraße 10, D-07743, Jena, Germany
| | - Peter Schulze
- Centre of Excellence for Polysaccharide Research, Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstraße 10, D-07743, Jena, Germany
| | - Thomas Heinze
- Centre of Excellence for Polysaccharide Research, Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstraße 10, D-07743, Jena, Germany
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14
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Zhou Z, Xu Z, Yang X. Molecular dynamics simulation of interface-mediated GO-GO interaction at the air-water interface. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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15
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Hashemi Amrei SMH, Miller GH, Ristenpart WD. Asymmetric rectified electric fields between parallel electrodes: Numerical and scaling analyses. Phys Rev E 2019; 99:062603. [PMID: 31330682 DOI: 10.1103/physreve.99.062603] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Indexed: 06/10/2023]
Abstract
Recent computational and experimental work has established the existence of asymmetric rectified electric fields (AREFs), a type of steady electric field that occurs in liquids in response to an applied oscillatory potential, provided the ions present have different mobilities [Hashemi Amrei et al., Phys. Rev. Lett. 121, 185504 (2018)PRLTAO0031-900710.1103/PhysRevLett.121.185504]. Here we use scaling analyses and numerical calculations to elaborate the nature of one-dimensional AREFs between parallel electrodes. The AREF magnitude is shown to increase quadratically with applied potential at low potentials, increase nonlinearly at intermediate potentials, then increase with a constant rate slower than quadratically at sufficiently high potentials, with no impact at any potential on the spatial structure of the AREF. In contrast, the AREF peak location increases linearly with a frequency-dependent diffusive length scale for all conditions tested, with corresponding decreases in both the magnitude and number of sign changes in the directionality of AREF. Furthermore, both the magnitude and spatial structure of the AREF depend sensitively on the ionic mobilities, valencies, and concentrations, with a potential-dependent peak AREF magnitude occurring at an ionic mobility ratio of D_{-}/D_{+}⪅5. The results are summarized with approximate scaling expressions that will facilitate interpretation of the steady component for oscillatory fields in liquid systems.
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Affiliation(s)
- S M H Hashemi Amrei
- Department of Chemical Engineering, University of California Davis, Davis, California 95616, USA
| | - Gregory H Miller
- Department of Chemical Engineering, University of California Davis, Davis, California 95616, USA
| | - William D Ristenpart
- Department of Chemical Engineering, University of California Davis, Davis, California 95616, USA
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16
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Hashemi Amrei SMH, Bukosky SC, Rader SP, Ristenpart WD, Miller GH. Oscillating Electric Fields in Liquids Create a Long-Range Steady Field. PHYSICAL REVIEW LETTERS 2018; 121:185504. [PMID: 30444382 DOI: 10.1103/physrevlett.121.185504] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 07/19/2018] [Indexed: 06/09/2023]
Abstract
We demonstrate that application of an oscillatory electric field to a liquid yields a long-range steady field, provided the ions present have unequal mobilities. The main physics is illustrated by a two-ion harmonic oscillator, yielding an asymmetric rectified field whose time average scales as the square of the applied field strength. Computations of the fully nonlinear electrokinetic model corroborate the two-ion model and further demonstrate that steady fields extend over large distances between two electrodes. Experimental measurements of the levitation height of micron-scale colloids versus applied frequency accord with the numerical predictions. The heretofore unsuspected existence of a long-range steady field helps explain several long-standing questions regarding the behavior of particles and electrically induced fluid flows in response to oscillatory potentials.
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Affiliation(s)
- S M H Hashemi Amrei
- Department of Chemical Engineering, University of California Davis, Davis, California 95616, USA
| | - Scott C Bukosky
- Department of Chemical Engineering, University of California Davis, Davis, California 95616, USA
| | - Sean P Rader
- Department of Chemical Engineering, University of California Davis, Davis, California 95616, USA
| | - William D Ristenpart
- Department of Chemical Engineering, University of California Davis, Davis, California 95616, USA
| | - Gregory H Miller
- Department of Chemical Engineering, University of California Davis, Davis, California 95616, USA
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17
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Li G, Zhao X, Chu Q. New insights into the viscosity features of cationic polyacrylamide microgels in aqueous solutions. J Appl Polym Sci 2018. [DOI: 10.1002/app.46297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Guanghui Li
- Department of Petroleum Engineering; College of Vehicles and Energy in Yanshan University; Qinhuangdao 066004 China
| | - Xiaoyun Zhao
- Department of Petroleum Engineering; College of Vehicles and Energy in Yanshan University; Qinhuangdao 066004 China
| | - Qingzhong Chu
- Department of Petroleum Engineering; College of Vehicles and Energy in Yanshan University; Qinhuangdao 066004 China
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18
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Cheng D, Ariafar S, Sheibat-Othman N, Pohn J, McKenna TFL. Particle Coagulation of Emulsion Polymers: A Review of Experimental and Modelling Studies. POLYM REV 2018. [DOI: 10.1080/15583724.2017.1405979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Dang Cheng
- Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés (C2P2)-LCPP group, Villeurbanne, France
| | - Solmaz Ariafar
- Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés (C2P2)-LCPP group, Villeurbanne, France
| | - Nida Sheibat-Othman
- Université Claude Bernard Lyon 1, CPE Lyon, CNRS, LAGEP UMR 5007, Villeurbanne, France
| | - Jordan Pohn
- Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés (C2P2)-LCPP group, Villeurbanne, France
| | - Timothy F. L. McKenna
- Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés (C2P2)-LCPP group, Villeurbanne, France
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19
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van Gruijthuijsen K, Obiols-Rabasa M, Schurtenberger P, Bouwman WG, Stradner A. The extended law of corresponding states when attractions meet repulsions. SOFT MATTER 2018; 14:3704-3715. [PMID: 29557476 DOI: 10.1039/c8sm00160j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Short-range attractive colloids show well-defined phase behaviour in the absence of repulsions, and highly intriguing equilibrium gelation in the presence of long-range repulsions. We present the state diagram of short-range attractive colloids with repulsions that range from fully screened to intermediately ranged, i.e. longer-ranged than the attractions, but shorter ranged than the colloid size. We demonstrate that although the macroscopic phase behaviour does not change perceptibly, there is a dramatic increase of inhomogeneities once the repulsions become longer-ranged than the attractions. The interaction potentials are characterized with small angle neutron scattering, and used to renormalize the state diagram with the minimum in the interaction potential, min[U(r)], and with the reduced second virial coefficient, B2*. We find that the extended law of corresponding states captures the onset of phase separation for shorter ranged repulsions, but fails for longer ranged repulsions. Instead, for a given model of U(r), the transition from visually homogeneous fluid to phase separation and/or gelation can be rescaled with min[U(r)] over the full range of repulsions. Finally, we suggest a generic state diagram to describe the effect of repulsions on short-range attractive systems.
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Affiliation(s)
- K van Gruijthuijsen
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland.
| | - M Obiols-Rabasa
- Division of Physical Chemistry, Department of Chemistry, Lund University, Naturvetarvägen 16, SE-223 62 Lund, Sweden
| | - P Schurtenberger
- Division of Physical Chemistry, Department of Chemistry, Lund University, Naturvetarvägen 16, SE-223 62 Lund, Sweden
| | - W G Bouwman
- Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
| | - A Stradner
- Division of Physical Chemistry, Department of Chemistry, Lund University, Naturvetarvägen 16, SE-223 62 Lund, Sweden
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20
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Neal TJ, Beattie DL, Byard SJ, Smith GN, Murray MW, Williams NSJ, Emmett SN, Armes SP, Spain SG, Mykhaylyk OO. Self-Assembly of Amphiphilic Statistical Copolymers and Their Aqueous Rheological Properties. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02134] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Thomas J. Neal
- Department
of Chemistry, Dainton Building, The University of Sheffield, Sheffield S3 7HF, U.K
| | - Deborah L. Beattie
- Department
of Chemistry, Dainton Building, The University of Sheffield, Sheffield S3 7HF, U.K
| | - Sarah J. Byard
- Department
of Chemistry, Dainton Building, The University of Sheffield, Sheffield S3 7HF, U.K
| | - Gregory N. Smith
- Department
of Chemistry, Dainton Building, The University of Sheffield, Sheffield S3 7HF, U.K
| | - Martin W. Murray
- AkzoNobel Decorative
Paints, Wexham Road, Slough, Berkshire SL2 5DS, U.K
| | | | - Simon N. Emmett
- AkzoNobel Decorative
Paints, Wexham Road, Slough, Berkshire SL2 5DS, U.K
| | - Steven P. Armes
- Department
of Chemistry, Dainton Building, The University of Sheffield, Sheffield S3 7HF, U.K
| | - Sebastian G. Spain
- Department
of Chemistry, Dainton Building, The University of Sheffield, Sheffield S3 7HF, U.K
| | - Oleksandr O. Mykhaylyk
- Department
of Chemistry, Dainton Building, The University of Sheffield, Sheffield S3 7HF, U.K
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21
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Zhang M, Yang J, Yang Q, Huang L, Wu H, Chen L, Ding C. Fluorescence studies on the aggregation behaviors of collagen modified with NHS-activated poly(γ-glutamic acid). Int J Biol Macromol 2018; 112:1156-1163. [PMID: 29425869 DOI: 10.1016/j.ijbiomac.2018.02.027] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Revised: 02/03/2018] [Accepted: 02/05/2018] [Indexed: 12/20/2022]
Abstract
The poly(γ-glutamic acid)-NHS (γ-PGA-NHS) esters were used to endow collagen with both of excellent water-solubility and thermal stability via cross-linking reaction between γ-PGA-NHS and collagen. In the present work, the effect of γ-PGA-NHS on the aggregation of collagen molecules was studied by fluorescence techniques. The fluorescence emission spectra of pyrene in collagen solutions and the intrinsic fluorescence emission spectra of collagen suggested different effects of γ-PGA-NHS on collagen molecules: inhibiting aggregation below critical aggregation concentration (CAC) and promoting aggregation above CAC. The two-dimensional (2D) fluorescence correlation spectra indicated that the intermolecular hydrogen bonding and cross-linking between γ-PGA-NHS and collagen would influence the aggregation of collagen molecules. By the ultra-sensitive differential scanning calorimeter (VP-DSC), it was found that the main denaturational transition temperature (Tm2) of modified collagen increased, while its calorimetric enthalpy changes (ΔH2) decreased compared to those of native collagen, further indicating that the modification of γ-PGA-NHS influenced the aggregation of collagen molecules. The study provide useful information for the utilizing and or the processing of water-soluble collagen in aqueous solution in the fields such as cosmetics, health care products, tissue engineering and biomedical materials, etc.
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Affiliation(s)
- Min Zhang
- College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Junhui Yang
- College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Qili Yang
- College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Liulian Huang
- College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Hui Wu
- College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Lihui Chen
- College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China.
| | - Cuicui Ding
- College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou 350108, PR China.
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22
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Grisham DR, Nanda V. Hydrodynamic radius coincides with the slip plane position in the electrokinetic behavior of lysozyme. Proteins 2018; 86:515-523. [PMID: 29383755 DOI: 10.1002/prot.25469] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 01/19/2018] [Accepted: 01/23/2018] [Indexed: 02/01/2023]
Abstract
The zeta potential (ζ) is the effective charge energy of a solvated protein, describing the magnitude of electrostatic interactions in solution. It is commonly used in the assessment of adsorption processes and dispersion stability. Predicting ζ from molecular structure would be useful to the structure-based molecular design of drugs, proteins, and other molecules that hold charge-dependent function while remaining suspended in solution. One challenge in predicting ζ is identifying the location of the slip plane (XSP ), a distance from the protein surface where ζ is theoretically defined. This study tests the hypothesis that the XSP can be estimated by the Stokes-Einstein hydrodynamic radius (Rh ), using globular hen egg white lysozyme as a model system. Although the XSP and Rh differ in their theoretical definitions, with the XSP being the position of the ζ during electrokinetic phenomena (e.g., electrophoresis) and the Rh being a radius pertaining to the edge of solvation during diffusion, they both represent the point where water and ions no longer adhere to a molecule. This work identifies the limited range of ionic strengths in which the XSP can be determined using diffusivity measurements and the Stokes-Einstein equation. In addition, a computational protocol is developed for determining the ζ from a protein crystal structure. At low ionic strengths, a hyperdiffusivity regime exists, requiring direct measurement of electrophoretic mobility to determine ζ. This work, therefore, supports a basic tenant of EDL theory that the electric double layer during diffusion and electrophoresis are equivalent in the Stokes-Einstein regime.
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Affiliation(s)
- Daniel R Grisham
- Center for Advanced Biotechnology and Medicine, Robert Wood Johnson Medical School, Rutgers University, Piscataway, New Jersey
| | - Vikas Nanda
- Center for Advanced Biotechnology and Medicine, Robert Wood Johnson Medical School, Rutgers University, Piscataway, New Jersey
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23
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24
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Pepper JT, Maheshwari P, Eudes F. Adsorption of cell-penetrating peptide Tat2 and polycation luviquat FC-370 to triticale microspore exine. Colloids Surf B Biointerfaces 2017; 157:207-214. [PMID: 28599181 DOI: 10.1016/j.colsurfb.2017.05.075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 05/16/2017] [Accepted: 05/30/2017] [Indexed: 01/01/2023]
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25
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Abstract
Chemical chaperones including arginine and its derivatives are widely used by biochemists working on the design of agents, which are able to efficiently suppress protein aggregation. To elucidate the mechanisms of anti-aggregation activity of chemical chaperones, methods based on registration of the increment in light scattering intensity must be supplemented with methods for direct detection of the portion of aggregated protein (γagg). For this purpose asymmetric flow field-flow fractionation was used in the present work. It was shown that heat-induced aggregation of bovine serum albumin (BSA) followed the kinetics of the reaction of the second order (0.1 M sodium phosphate buffer, pH 7.0, 70 °C). It was proposed to use Rhvs γagg plots to characterize the aggregation pathway (Rh is the hydrodynamic radius of the protein aggregates, which was calculated from the dynamic light scattering data). The changes in the shape of Rhvs γagg plots in the presence of arginine, arginine amide and arginine ethyl ester are indicative of the changes in the aggregation pathway of BSA aggregation. A conclusion has been made that larger aggregates are formed in the presence of arginine hydrochloride and its derivatives.
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26
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Méndez PA, Ortiz BL, Vásquez GM, López BL. Mucoadhesive chitosan/OA nanoparticles charged with celecoxib inhibit prostaglandin E2 LPS-induced in U937 cell line. J Appl Polym Sci 2017. [DOI: 10.1002/app.45288] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Paula A. Méndez
- Grupo de Investigación Ciencia de los Materiales; Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia; Medellín Colombia
| | - Blanca L. Ortiz
- Grupo de Inmunología Celular e Inmunogenética; Instituto de Investigaciones Médicas, Facultad de Medicina, Universidad de Antioquia; Medellín Colombia
| | - Gloria M. Vásquez
- Grupo de Inmunología Celular e Inmunogenética; Instituto de Investigaciones Médicas, Facultad de Medicina, Universidad de Antioquia; Medellín Colombia
| | - Betty L. López
- Grupo de Investigación Ciencia de los Materiales; Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia; Medellín Colombia
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27
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Lokhande GP, Chambhare SU, Jagtap RN. Anionic water-based polyurethane dispersions for antimicrobial coating application. Polym Bull (Berl) 2017. [DOI: 10.1007/s00289-017-1965-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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28
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Kundan L, Mallick SS, Pal B. An investigation into the effect of nanoclusters growth on perikinetic heat conduction mechanism in an oxide based nanofluid. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.01.095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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29
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Méndez PA, Vásquez GM, Gartner C, López BL. Chitosan/OA nanoparticle as delivery system for celecoxib: Parameters affecting the particle size, encapsulation, and release. J Appl Polym Sci 2016. [DOI: 10.1002/app.44472] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Paula A. Méndez
- Grupo de Investigación Ciencia de los Materiales, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia; Calle 70 N° 52-21 Medellín Colombia
| | - Gloria M. Vásquez
- Grupo de Inmunología Celular e Inmunogenética, Instituto de Investigaciones Médicas, Facultad de Medicina, Universidad de Antioquia; Calle 70 N° 52-21 Medellín Colombia
| | - Carmiña Gartner
- Grupo de Investigación Ciencia de los Materiales, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia; Calle 70 N° 52-21 Medellín Colombia
| | - Betty L. López
- Grupo de Investigación Ciencia de los Materiales, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia; Calle 70 N° 52-21 Medellín Colombia
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30
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Johnson M, Peakall J, Fairweather M, Biggs S, Harbottle D, Hunter TN. Characterization of Multiple Hindered Settling Regimes in Aggregated Mineral Suspensions. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b02383] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | - Simon Biggs
- School
of Chemical Engineering, University of Queensland, Brisbane, Queensland 4072, Australia
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31
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Xie F, Turesson M, Woodward CE, van Gruijthuijsen K, Stradner A, Forsman J. Theoretical predictions of structures in dispersions containing charged colloidal particles and non-adsorbing polymers. Phys Chem Chem Phys 2016; 18:11422-34. [PMID: 27056112 DOI: 10.1039/c5cp07814h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We develop a theoretical model to describe structural effects on a specific system of charged colloidal polystyrene particles, upon the addition of non-adsorbing PEG polymers. This system has previously been investigated experimentally, by scattering methods, so we are able to quantitatively compare predicted structure factors with corresponding experimental data. Our aim is to construct a model that is coarse-grained enough to be computationally manageable, yet detailed enough to capture the important physics. To this end, we utilize classical polymer density functional theory, wherein all possible polymer configurations are accounted for, subject to a mean-field Boltzmann weight. We make efforts to counteract drawbacks with this mean-field approach, resulting in structural predictions that agree very well with computationally more demanding simulations. Electrostatic interactions are handled at the fully non-linear Poisson-Boltzmann level, and we demonstrate that a linearization leads to less accurate predictions. The particle charge is an experimentally unknown parameter. We define the surface charge such that the experimental and theoretical gel point at equal polymer concentration coincide. Assuming a fixed surface charge for a certain salt concentration, we find very good agreements between measured and predicted structure factors across a wide range of polymer concentrations. We also present predictions for other structural quantities, such as radial distribution functions, and cluster size distributions. Finally, we demonstrate that our model predicts the occurrence of equilibrium clusters at high polymer concentrations, but low particle volume fractions and salt levels.
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Affiliation(s)
- Fei Xie
- Theoretical Chemistry, Lund University, P.O. Box 124, S-221 00 Lund, Sweden.
| | - Martin Turesson
- Theoretical Chemistry, Lund University, P.O. Box 124, S-221 00 Lund, Sweden.
| | - Clifford E Woodward
- School of Physical, Environmental and Mathematical Sciences, University College, University of New South Wales, ADFA, Canberra, ACT 2600, Australia
| | - Kitty van Gruijthuijsen
- Adolphe Merkle Institute, University of Fribourg, Chemin des verdiers 4, CH-1700 Fribourg, Switzerland
| | - Anna Stradner
- Physical Chemistry, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Jan Forsman
- Theoretical Chemistry, Lund University, P.O. Box 124, S-221 00 Lund, Sweden.
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32
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Blundell ELCJ, Vogel R, Platt M. Particle-by-Particle Charge Analysis of DNA-Modified Nanoparticles Using Tunable Resistive Pulse Sensing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1082-1090. [PMID: 26757237 DOI: 10.1021/acs.langmuir.5b03024] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Resistive pulse sensors, RPS, are allowing the transport mechanism of molecules, proteins and even nanoparticles to be characterized as they traverse pores. Previous work using RPS has shown that the size, concentration and zeta potential of the analyte can be measured. Here we use tunable resistive pulse sensing (TRPS) which utilizes a tunable pore to monitor the translocation times of nanoparticles with DNA modified surfaces. We start by demonstrating that the translocation times of particles can be used to infer the zeta potential of known standards and then apply the method to measure the change in zeta potential of DNA modified particles. By measuring the translocation times of DNA modified nanoparticles as a function of packing density, length, structure, and hybridization time, we observe a clear difference in zeta potential using both mean values and population distributions as a function of the DNA structure. We demonstrate the ability to resolve the signals for ssDNA, dsDNA, small changes in base length for nucleotides between 15 and 40 bases long, and even the discrimination between partial and fully complementary target sequences. Such a method has potential and applications in sensors for the monitoring of nanoparticles in both medical and environmental samples.
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Affiliation(s)
- Emma L C J Blundell
- Department of Chemistry, School of Science, Loughborough University , Loughborough, Leicestershire LE11 3TU, United Kingdom
| | - Robert Vogel
- Izon Science Limited , 8C Homersham Place, PO Box 39168, Burnside, Christchurch 8053, New Zealand
- School of Mathematics and Physics, The University of Queensland , Brisbane 4072, Australia
| | - Mark Platt
- Department of Chemistry, School of Science, Loughborough University , Loughborough, Leicestershire LE11 3TU, United Kingdom
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33
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Laganapan A, Bochicchio D, Bienia M, Videcoq A, Ferrando R. Aggregation of binary colloidal suspensions on attractive walls. Phys Chem Chem Phys 2016; 18:3073-9. [PMID: 26739745 DOI: 10.1039/c5cp07050c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The adsorption of colloidal particles from a suspension on a solid surface is of fundamental importance to many physical and biological systems. In this work, Brownian Dynamics simulations are performed to study the aggregation in a suspension of oppositely charged colloidal particles in the presence of an attractive wall. For sufficiently strong attractions, the wall alters the microstructure of the aggregates so that B2 (CsCl-type) structures are more likely obtained instead of B1 (NaCl-type) structures. The probability of forming either B1 or B2 crystallites depends also on the inverse interaction range κa. Suspensions with small κa are more likely to form B2 crystals than suspensions with larger κa, even if the energetic stability of the B2 phase decreases with decreasing κa. The mechanisms underlying this aggregation and crystallization behaviour are analyzed in detail.
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Affiliation(s)
- Aleena Laganapan
- SPCTS, UMR 7315, ENSCI, CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France and Dipartimento di Fisica, via Dodecaneso 33, 16146, Genova, Italy
| | | | - Marguerite Bienia
- SPCTS, UMR 7315, ENSCI, CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
| | - Arnaud Videcoq
- SPCTS, UMR 7315, ENSCI, CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
| | - Riccardo Ferrando
- Dipartimento di Chimica e Chimica Industriale and CNR-IMEM, via Dodecaneso 31, 16146, Genova, Italy.
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34
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Fluorescence study on the aggregation of collagen molecules in acid solution influenced by hydroxypropyl methylcellulose. Carbohydr Polym 2016; 136:224-31. [DOI: 10.1016/j.carbpol.2015.09.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 08/21/2015] [Accepted: 09/09/2015] [Indexed: 11/17/2022]
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35
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Salt-induced reentrant stability of polyion-decorated particles with tunable surface charge density. Colloids Surf B Biointerfaces 2016; 137:109-20. [DOI: 10.1016/j.colsurfb.2015.06.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 06/03/2015] [Accepted: 06/04/2015] [Indexed: 01/17/2023]
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36
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George S, Champagne-Hartley R, Deeter G, Campbell D, Reck B, Urban D, Cunningham M. Amphiphilic Block Copolymers as Stabilizers in Emulsion Polymerization: Effects of the Stabilizing Block Molecular Weight Dispersity on Stabilization Performance. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01853] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sean George
- Department
of Chemical Engineering, Queen’s University, Kingston, ON, Canada K7L 3N6
| | | | - Gary Deeter
- BASF Corporation, Wyandotte, Michigan 48192, United States
| | - Dave Campbell
- BASF Corporation, Wyandotte, Michigan 48192, United States
| | | | | | - Michael Cunningham
- Department
of Chemical Engineering, Queen’s University, Kingston, ON, Canada K7L 3N6
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37
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Qiu Y, Yang C, Hinkle P, Vlassiouk IV, Siwy ZS. Anomalous Mobility of Highly Charged Particles in Pores. Anal Chem 2015; 87:8517-23. [DOI: 10.1021/acs.analchem.5b02060] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yinghua Qiu
- School
of Mechanical Engineering and Jiangsu Key Laboratory for Design and
Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
| | | | | | - Ivan V. Vlassiouk
- Oak Ridge National Laboratory, Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
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Owczarz M, Motta AC, Morbidelli M, Arosio P. A Colloidal Description of Intermolecular Interactions Driving Fibril-Fibril Aggregation of a Model Amphiphilic Peptide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:7590-7600. [PMID: 26125620 DOI: 10.1021/acs.langmuir.5b01110] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We apply a kinetic analysis platform to study the intermolecular interactions underlying the colloidal stability of dispersions of charged amyloid fibrils consisting of a model amphiphilic peptide (RADA 16-I). In contrast to the aggregation mechanisms observed in the large majority of proteins and peptides, where several elementary reactions involving both monomers and fibrils are present simultaneously, the system selected in this work allows the specific investigation of the fibril-fibril aggregation process. We examine the intermolecular interactions driving the aggregation reaction at pH 2.0 by changing the buffer composition in terms of salt concentration, type of ion as well as type and concentration of organic solvent. The aggregation kinetics are followed by dynamic light scattering, and the experimental data are simulated by Smoluchowski population balance equations, which allow to estimate the energy barrier between two colliding fibrils in terms of the Fuchs stability ratio (W). When normalized on a dimensionless time weighted on the Fuchs stability ratio, the aggregation profiles under a broad range of conditions collapse on a single master curve, indicating that the buffer composition modifies the aggregation kinetics without affecting the aggregation mechanism. Our results show that the aggregation process does not occur under diffusion-limited conditions. Rather, the reaction rate is limited by the presence of an activation energy barrier that is largely dominated by electrostatic repulsive interactions. Such interactions could be reduced by increasing the concentration of salt, which induces charge screening, or the concentration of organic solvent, which affects the dielectric constant. It is remarkable that the dependence of the activation energy on the ionic strength can be described quantitatively in terms of charge screening effects in the frame of the DLVO theory, although specific anion and cation effects are also observed. While anion effects are mainly related to the binding to the positive groups of the fibril surface and to the resulting decrease of the surface charge, cation effects are more complex and involve additional solvation forces.
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Affiliation(s)
- Marta Owczarz
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich 8093, Switzerland
| | - Anna C Motta
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich 8093, Switzerland
| | - Massimo Morbidelli
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich 8093, Switzerland
| | - Paolo Arosio
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich 8093, Switzerland
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Montes Ruiz-Cabello FJ, Trefalt G, Oncsik T, Szilagyi I, Maroni P, Borkovec M. Interaction Forces and Aggregation Rates of Colloidal Latex Particles in the Presence of Monovalent Counterions. J Phys Chem B 2015; 119:8184-93. [DOI: 10.1021/acs.jpcb.5b02556] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- F. Javier Montes Ruiz-Cabello
- Department
of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
| | - Gregor Trefalt
- Department
of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
| | - Tamas Oncsik
- Department
of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
| | - Istvan Szilagyi
- Department
of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
| | - Plinio Maroni
- Department
of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
| | - Michal Borkovec
- Department
of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland
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40
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Affiliation(s)
- Lande Liu
- Dept. of Chemical Sciences; University of Huddersfield; Huddersfield HD1 3DH UK
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Lane LA, Qian X, Smith AM, Nie S. Physical chemistry of nanomedicine: understanding the complex behaviors of nanoparticles in vivo. Annu Rev Phys Chem 2015; 66:521-47. [PMID: 25622189 PMCID: PMC8590374 DOI: 10.1146/annurev-physchem-040513-103718] [Citation(s) in RCA: 117] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/13/2023]
Abstract
Nanomedicine is an interdisciplinary field of research at the interface of science, engineering, and medicine, with broad clinical applications ranging from molecular imaging to medical diagnostics, targeted therapy, and image-guided surgery. Despite major advances during the past 20 years, there are still major fundamental and technical barriers that need to be understood and overcome. In particular, the complex behaviors of nanoparticles under physiological conditions are poorly understood, and detailed kinetic and thermodynamic principles are still not available to guide the rational design and development of nanoparticle agents. Here we discuss the interactions of nanoparticles with proteins, cells, tissues, and organs from a quantitative physical chemistry point of view. We also discuss insights and strategies on how to minimize nonspecific protein binding, how to design multistage and activatable nanostructures for improved drug delivery, and how to use the enhanced permeability and retention effect to deliver imaging agents for image-guided cancer surgery.
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Affiliation(s)
- Lucas A Lane
- Departments of Biomedical Engineering and Chemistry, Emory University and Georgia Institute of Technology, Atlanta, Georgia 30322;
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Liang J, Tumpa F, Pérez Estrada L, Gamal El-Din M, Liu Y. Impact of ozonation on particle aggregation in mature fine tailings. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2014; 146:535-542. [PMID: 25214072 DOI: 10.1016/j.jenvman.2014.04.040] [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] [Received: 01/09/2014] [Revised: 04/20/2014] [Accepted: 04/22/2014] [Indexed: 06/03/2023]
Abstract
The extraction of bitumen from the oil sands in Canada generates tonnes of mature fine tailings (MFT), consisting of a mineral matrix of sand, clay, and water, which without treatment requires thousands of years to fully consolidate. We assessed the performance of a novel ozonation method designed to enhance the settling of MFT and explored the mechanisms involved. The solid content of MFT obtained from oil sands tailings was adjusted to 1, 3, 5 wt % with water before applying 15, 30, and 60 min of ozonation. MFT settled after a short (15 min) ozonation treatment, resulting in a sample with clear released water on the top and condensed sludge at the bottom. The water chemistry characteristics, particles' surface charge and chemical bonding were measured. Ozonation led to the increased organic acids concentrations in MFT suspension through converting of organic matter from high to low molecular weight, and detaching organic coating on MFT particles. The pH and the concentrations of ions in the MFT suspension were changed significantly, an association of metal ions with MFT particles was promoted, and the surface charges of MFT particles were neutralized. Consequently, the MFT suspension was destabilized and MFT particle precipitation was observed.
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Affiliation(s)
- Jiaming Liang
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2W2
| | - Fahmida Tumpa
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2W2
| | - Leonidas Pérez Estrada
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2W2
| | - Mohamed Gamal El-Din
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2W2.
| | - Yang Liu
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2W2.
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Fornaguera C, Grijalvo S, Galán M, Fuentes-Paniagua E, de la Mata FJ, Gómez R, Eritja R, Calderó G, Solans C. Novel non-viral gene delivery systems composed of carbosilane dendron functionalized nanoparticles prepared from nano-emulsions as non-viral carriers for antisense oligonucleotides. Int J Pharm 2014; 478:113-123. [PMID: 25448573 DOI: 10.1016/j.ijpharm.2014.11.031] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 11/12/2014] [Accepted: 11/13/2014] [Indexed: 12/18/2022]
Abstract
The development of novel and efficient delivery systems is often the limiting step in fields such as antisense therapies. In this context, poly(d,l-lactide-co-glycolide) acid (PLGA) nanoparticles have been obtained by a versatile and simple technology based on nano-emulsion templating and low-energy emulsification methods, performed in mild conditions, providing good size control. O/W polymeric nano-emulsions were prepared by the phase inversion composition method at 25°C using the aqueous solution/polysorbate80/[4 wt% PLGA in ethyl acetate] system. Nano-emulsions formed at oil-to-surfactant (O/S) ratios between 10/90-90/10 and aqueous contents above 70 wt%. Nano-emulsion with 90 wt% of aqueous solution and O/S ratio of 70/30 was chosen for further studies, since they showed the appropriate characteristics to be used as nanoparticle template: hydrodynamic radii lower than 50 nm and enough kinetic stability. Nanoparticles, prepared from nano-emulsions by solvent evaporation, showed spherical shape, sizes about 40 nm, negative surface charges and high stability. The as-prepared nanoparticles were functionalized with carbosilane cationic dendrons through a carbodiimide-mediated reaction achieving positively charged surfaces. Antisense oligonucleotides were electrostatically attached to nanoparticles surface to perform gene-silencing studies. These complexes were non-haemolytic and non-cytotoxic at the concentrations required. The ability of the complexes to impart cellular uptake was also promising. Therefore, these novel nanoparticulate complexes might be considered as potential non-viral carriers in antisense therapy.
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Affiliation(s)
- Cristina Fornaguera
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), C/Jordi Girona, 18-26, 08034, Barcelona, Spain; CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain
| | - Santiago Grijalvo
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), C/Jordi Girona, 18-26, 08034, Barcelona, Spain; CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain
| | - Marta Galán
- CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain; Group of Dendrimers for Biomedical Applications, University of Alcalá (GDAB-UAH), Alcalá de Henares, Madrid, Spain
| | - Elena Fuentes-Paniagua
- CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain; Group of Dendrimers for Biomedical Applications, University of Alcalá (GDAB-UAH), Alcalá de Henares, Madrid, Spain
| | - Francisco Javier de la Mata
- CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain; Group of Dendrimers for Biomedical Applications, University of Alcalá (GDAB-UAH), Alcalá de Henares, Madrid, Spain
| | - Rafael Gómez
- CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain; Group of Dendrimers for Biomedical Applications, University of Alcalá (GDAB-UAH), Alcalá de Henares, Madrid, Spain
| | - Ramon Eritja
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), C/Jordi Girona, 18-26, 08034, Barcelona, Spain; CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain
| | - Gabriela Calderó
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), C/Jordi Girona, 18-26, 08034, Barcelona, Spain; CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain
| | - Conxita Solans
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), C/Jordi Girona, 18-26, 08034, Barcelona, Spain; CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain.
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Electrophoresis and stability of nano-colloids: history, theory and experimental examples. Adv Colloid Interface Sci 2014; 211:77-92. [PMID: 24997868 DOI: 10.1016/j.cis.2014.06.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 06/11/2014] [Accepted: 06/12/2014] [Indexed: 11/22/2022]
Abstract
The paper contains an extended historical overview of research activities focused on determining interfacial potential and charge of dispersed particles from electrophoretic and coagulation dynamic measurements. Particular attention is paid to nano-suspensions for which application of Standard Electrokinetic Model (SEM) to analysis of experimental data encounters difficulties, especially, when the solutions contain more than two ions, the particle charge depends on the solution composition and zeta-potentials are high. Detailed statements of Standard Electrokinetic and DLVO Models are given in the forms that are capable of addressing electrophoresis and interaction of particles for arbitrary ratios of the particle to Debye radius, interfacial potentials and electrolyte compositions. The experimental part of the study consists of two groups of measurements conducted for Pt/C nano-suspensions, namely, the electrophoretic and coagulation dynamic studies, with various electrolyte compositions. The obtained experimental data are processed by using numerical algorithms based on the formulated models for obtaining interfacial potential and charge. While analyzing the dependencies of interfacial potential and charge on the electrolyte compositions, conclusions are made regarding the mechanisms of charge formation. It is established that the behavior of system stability is in a qualitative agreement with the results computed from the electrophoretic data. The verification of quantitative applicability of the employed models is conducted by calculating the Hamaker constant from experimental data. It is proposed how to explain the observed variations of predicted Hamaker constant and its unusually high value.
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López-León T, Ortega-Vinuesa JL, Bastos-González D, Elaissari A. Thermally sensitive reversible microgels formed by poly(N-Isopropylacrylamide) charged chains: a Hofmeister effect study. J Colloid Interface Sci 2014; 426:300-7. [PMID: 24863797 DOI: 10.1016/j.jcis.2014.04.020] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 04/07/2014] [Accepted: 04/10/2014] [Indexed: 10/25/2022]
Abstract
In this study, we present a new method to obtain anionic and cationic stable colloidal nanogels from PNIPAM charged chains. The stability of the particles formed by inter-chain aggregation stems from the charged chemical groups attached at the sides of PNIPAM polymer chains. The particle formation is fully reversible-that is, it is possible to change from stable polymer solutions to stable colloidal dispersions and vice versa simply by varying temperature. In addition, we also demonstrate that the polymer LCST (lower critical solution temperature), the final particle size and the electrokinetic behavior of the particles formed are highly dependent on the electrolyte nature and salt concentration. These latter results are related to Hofmeister effects. The analysis of these results provides more insights about the origin of this ionic specificity, confirming that the interaction of ions with interfaces is dominated by the chaotropic/kosmotropic character of the ions and the hydrophobic/hydrophilic character of the surface in solution.
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Affiliation(s)
- Teresa López-León
- EC2M, UMR Gulliver CNRS-ESPCI 7083 - 10 Rue Vauquelin, F-75231 Paris Cedex 05, France
| | - Juan L Ortega-Vinuesa
- Biocolloid and Fluid Physics Group, Department of Applied Physics, University of Granada, Av. Fuentenueva S/N, 18071 Granada, Spain
| | - Delfi Bastos-González
- Biocolloid and Fluid Physics Group, Department of Applied Physics, University of Granada, Av. Fuentenueva S/N, 18071 Granada, Spain.
| | - Abdelhamid Elaissari
- University of Lyon, F-69622 Lyon, France; University of Lyon-1, Villeurbanne, CNRS, (UMR 5007), LAGEP-CPE-308G, 43 bd. du 11 Nov. 1918, F-69622 Villeurbanne, France
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47
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Durham OZ, Shipp DA. Suspension thiol-ene photopolymerization: Effect of stabilizing agents on particle size and stability. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.02.044] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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48
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Li G, Zhang G, Wang L, Ge J. Cationic microgel emulsion with a high solid content by a multistep addition method in inverse microemulsion polymerization. J Appl Polym Sci 2014. [DOI: 10.1002/app.40585] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Guanghui Li
- School of Petroleum Engineering; China University of Petroleum (East China); Qingdao 266580 China
| | - Guicai Zhang
- School of Petroleum Engineering; China University of Petroleum (East China); Qingdao 266580 China
| | - Lei Wang
- Department of Petroleum Engineering; Colorado School of Mines; Golden Colorado
| | - Jijiang Ge
- School of Petroleum Engineering; China University of Petroleum (East China); Qingdao 266580 China
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49
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Zhang Y, Landfester K, Taden A. A Facile Route toward Structured Hybrid Particles Based on Liquid–Solid Assembly. Macromolecules 2014. [DOI: 10.1021/ma401893g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yang Zhang
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Adhesive Research, Henkel AG & Co. KGaA, Henkelstrasse 67, 40191 Düsseldorf, Germany
| | - Katharina Landfester
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Andreas Taden
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Adhesive Research, Henkel AG & Co. KGaA, Henkelstrasse 67, 40191 Düsseldorf, Germany
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50
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Fiel LA, Contri RV, Bica JF, Figueiró F, Battastini AMO, Guterres SS, Pohlmann AR. Labeling the oily core of nanocapsules and lipid-core nanocapsules with a triglyceride conjugated to a fluorescent dye as a strategy to particle tracking in biological studies. NANOSCALE RESEARCH LETTERS 2014; 9:233. [PMID: 24936156 PMCID: PMC4045892 DOI: 10.1186/1556-276x-9-233] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 04/27/2014] [Indexed: 05/22/2023]
Abstract
The synthesis of novel fluorescent materials represents a very important step to obtain labeled nanoformulations in order to evaluate their biological behavior. The strategy of conjugating a fluorescent dye with triacylglycerol allows that either particles differing regarding supramolecular structure, i.e., nanoemulsions, nanocapsules, lipid-core nanocapsules, or surface charge, i.e., cationic nanocapsules and anionic nanocapsules, can be tracked using the same labeled material. In this way, a rhodamine B-conjugated triglyceride was obtained to prepare fluorescent polymeric nanocapsules. Different formulations were obtained, nanocapsules (NC) or lipid-core nanocapsules (LNC), using the labeled oil and Eudragit RS100, Eudragit S100, or poly(caprolactone) (PCL), respectively. The rhodamine B was coupled with the ricinolein by activating the carboxylic function using a carbodiimide derivative. Thin layer chromatography, proton nuclear magnetic resonance ((1)H-NMR), Fourier transform infrared spectroscopy (FTIR), UV-vis, and fluorescence spectroscopy were used to identify the new product. Fluorescent nanocapsule aqueous suspensions were prepared by the solvent displacement method. Their pH values were 4.6 (NC-RS100), 3.5 (NC-S100), and 5.0 (LNC-PCL). The volume-weighted mean diameter (D 4.3) and polydispersity values were 150 nm and 1.05 (NC-RS100), 350 nm and 2.28 (NC-S100), and 270 nm and 1.67 (LNC-PCL). The mean diameters determined by photon correlation spectroscopy (PCS) (z-average) were around 200 nm. The zeta potential values were +5.85 mV (NC-RS100), -21.12 mV (NC-S100), and -19.25 mV (LNC-PCL). The wavelengths of maximum fluorescence emission were 567 nm (NC-RS100 and LNC-PCL) and 574 nm (NC-S100). Fluorescence microscopy was used to evaluate the cell uptake (human macrophage cell line) of the fluorescent nanocapsules in order to show the applicability of the approach. When the cells were treated with the fluorescent nanocapsules, red emission was detected around the cell nucleus. We demonstrated that the rhodamine B-conjugated triglyceride is a promising new material to obtain versatile dye-labeled nanocarriers presenting different chemical nature in their surfaces.
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Affiliation(s)
- Luana Almeida Fiel
- Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Av. Ipiranga, 2752, Porto Alegre, RS 90610-000, Brazil
- Departamento de Química Orgânica, Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, RS 91501-970, Brazil
| | - Renata Vidor Contri
- Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Av. Ipiranga, 2752, Porto Alegre, RS 90610-000, Brazil
| | - Juliane Freitas Bica
- Departamento de Química Orgânica, Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, RS 91501-970, Brazil
| | - Fabrício Figueiró
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, Porto Alegre, RS 90035-003, Brazil
| | - Ana Maria Oliveira Battastini
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, Porto Alegre, RS 90035-003, Brazil
| | - Sílvia Stanisçuaski Guterres
- Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Av. Ipiranga, 2752, Porto Alegre, RS 90610-000, Brazil
| | - Adriana Raffin Pohlmann
- Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Av. Ipiranga, 2752, Porto Alegre, RS 90610-000, Brazil
- Departamento de Química Orgânica, Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, RS 91501-970, Brazil
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