1
|
Drug-dendrimer complexes and conjugates: Detailed furtherance through theory and experiments. Adv Colloid Interface Sci 2022; 303:102639. [PMID: 35339862 DOI: 10.1016/j.cis.2022.102639] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 03/03/2022] [Accepted: 03/05/2022] [Indexed: 11/23/2022]
Abstract
Dendritic nanovectors-based drug delivery has gained significant attention in the past couple of decades. Dendrimers play a crucial role in deciding the solubility of sparingly soluble drug molecules and help in improving pharmacokinetics. A few important steps in drug delivery through dendrimers, such as drug encapsulation, formulation, and target-specific delivery, play an important role in deciding the fate of a drug molecule. It is also of prime importance to understand the interactions between a drug molecule and dendrimers at atomistic levels to decode the mechanism of action of drug-dendrimer complexes and their reliability in terms of drug delivery. Colossal progress in current experimental and computational approaches in the field has resulted in a vast amount of data that needs to be curated to be further implemented efficiently. Improved computational power has led to greater accuracy and prompt predictions of properties of drug-dendrimer complexes and their mechanism of action. The current review encapsulates the pioneering work in the field, experimental achievements in terms of drug delivery, and newer computational techniques employed in the advancement of the field.
Collapse
|
2
|
Gupta S, Biswas P. Effect of pH on Size and Internal Structure of Poly(propylene imine) Dendrimers: A Molecular Dynamics Simulation Study. J Phys Chem B 2018; 122:9250-9263. [PMID: 30199254 DOI: 10.1021/acs.jpcb.8b04653] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The behavior of poly(propylene imine) dendrimers at three different solution pH is investigated through molecular dynamics (MD) simulations in explicit solvent. MD simulations provide an insight into the conformational properties of dendrimers via the evaluation of their size, shape, radial density distribution, static structure factor, and scattering intensity. The size of the dendrimer increases from high solution pH to low pH. The internal structure of the dendrimer is quantified in terms of the radial atomic density profile and the terminal amine group density distribution. While the radial atomic density distribution shifts away from the core of the dendrimer with decreasing pH, a significant degree of back-folding of the outer generations is observed at high pH for higher generations of growth. Results from the structure factor and scattering intensity indicate two types of conformational transitions: (i) as a function of the solution pH, where the dendrimer evolves from an expanded structure at low pH to a highly compact one at high pH (except for higher generations), and (ii) with increasing generations, where the open structure of the dendrimer at lower generations transforms to a compact structure at higher generations at both high and low pH, characterized by a change in the fractal dimension.
Collapse
Affiliation(s)
- Shilpa Gupta
- Department of Chemistry , University of Delhi , Delhi 110007 , India
| | - Parbati Biswas
- Department of Chemistry , University of Delhi , Delhi 110007 , India
| |
Collapse
|
3
|
Karatasos K, Kritikos G. A microscopic view of graphene-oxide/poly(acrylic acid) physical hydrogels: effects of polymer charge and graphene oxide loading. SOFT MATTER 2018; 14:614-627. [PMID: 29265164 DOI: 10.1039/c7sm02305g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this work we have examined in detail by means of fully atomistic molecular dynamics simulations, physical hydrogels formed by a polymer electrolyte, poly(acrylic acid), and graphene oxide, at two different charging states of the polymer and two different graphene oxide concentrations. It was found that variations of these parameters incurred drastic changes in general morphological characteristics of the composite materials, the degree of physical adsorption of polyelectrolyte chains onto the graphene oxide surface, the polymer dynamic response at local and global length scales, in the charge distributions around the components, and in the mobility of the counterions. All these microscopic features are expected to significantly affect macroscopic physical properties of the hydrogels, such as their mechanical responses and their electrical behaviors.
Collapse
Affiliation(s)
- Kostas Karatasos
- Laboratory of Physical Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | | |
Collapse
|
4
|
Yu C, Ma L, Li K, Li S, Liu Y, Liu L, Zhou Y, Yan D. Computer Simulation Studies on the pH-Responsive Self-Assembly of Amphiphilic Carboxy-Terminated Polyester Dendrimers in Aqueous Solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:388-399. [PMID: 28001081 DOI: 10.1021/acs.langmuir.6b03480] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This paper investigates the pH-responsive self-assembly of an amphiphilic carboxyl-terminated polyester dendrimer, H20-COOH, in aqueous solution using the dissipative particle dynamics method. The electrostatic interactions were described by introducing the explicit interaction between the smeared charges on ionized polymer beads and the counterions. The results show that the self-assemblies could change from unimolecular micelles, microphase-separated small micelles, wormlike micelles, sheetlike micelles, and small vesicles to large vesicles with the decrease in the degree of ionization (α) of carboxylic acid groups. In addition, the detailed self-assembly mechanisms and the molecular packing models have also been disclosed for each self-assembly stages. Interestingly, the wormlike micelles are found to change from linear to branched when α decreases from 0.182 to 0.109. The current work might serve as a comprehensive understanding on the effect of carboxylic acid groups on the self-assembly behaviors of dendritic polymers.
Collapse
Affiliation(s)
- Chunyang Yu
- School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China
| | - Li Ma
- School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China
| | - Ke Li
- School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China
| | - Shanlong Li
- School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China
| | - Yannan Liu
- School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China
| | - Lifen Liu
- Center for Membrane and Water Science and Technology, Ocean College, Zhejiang University of Technology , Hangzhou 310014, China
| | - Yongfeng Zhou
- School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China
| | - Deyue Yan
- School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China
| |
Collapse
|
5
|
Smeijers AF, Markvoort AJ, Pieterse K, Hilbers PAJ. Coarse-grained simulations of poly(propylene imine) dendrimers in solution. J Chem Phys 2016; 144:074903. [DOI: 10.1063/1.4941379] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
|
6
|
Ghelichi M, Malek K, Eikerling MH. Ionomer Self-Assembly in Dilute Solution Studied by Coarse-Grained Molecular Dynamics. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02158] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Mahdi Ghelichi
- Department
of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A
1S6, Canada
| | - Kourosh Malek
- Department
of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A
1S6, Canada
- Energy,
Mining, and Environment, National Research Council of Canada, 4250
Wesbrook Mall, Vancouver, BC V6T 1W5, Canada
| | - Michael H. Eikerling
- Department
of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A
1S6, Canada
| |
Collapse
|
7
|
Eghtesadi SA, Haso F, Kashfipour MA, Lillard RS, Liu T. Supramolecular Assembly of Poly(propyleneimine) Dendrimers Driven By Simple Monovalent Counterions. Chemistry 2015; 21:18623-30. [DOI: 10.1002/chem.201502852] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Indexed: 01/21/2023]
|
8
|
Smeijers A, Markvoort A, Pieterse K, Hilbers P. Coarse-grained modelling of urea-adamantyl functionalised poly(propylene imine) dendrimers. MOLECULAR SIMULATION 2015. [DOI: 10.1080/08927022.2015.1096359] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- A.F. Smeijers
- Computational Biology, Department of Biomedical Engineering, Technische Universiteit Eindhoven, Eindhoven, the Netherlands
| | - A.J. Markvoort
- Computational Biology, Department of Biomedical Engineering, Technische Universiteit Eindhoven, Eindhoven, the Netherlands
- Institute for Complex Molecular Systems, Technische Universiteit Eindhoven, Eindhoven, the Netherlands
| | - K. Pieterse
- Computational Biology, Department of Biomedical Engineering, Technische Universiteit Eindhoven, Eindhoven, the Netherlands
- Institute for Complex Molecular Systems, Technische Universiteit Eindhoven, Eindhoven, the Netherlands
| | - P.A.J. Hilbers
- Computational Biology, Department of Biomedical Engineering, Technische Universiteit Eindhoven, Eindhoven, the Netherlands
- Institute for Complex Molecular Systems, Technische Universiteit Eindhoven, Eindhoven, the Netherlands
| |
Collapse
|
9
|
Molecular simulation study of PAMAM dendrimer composite membranes. J Mol Model 2014; 20:2119. [DOI: 10.1007/s00894-014-2119-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 12/14/2013] [Indexed: 01/20/2023]
|
10
|
Filipe LCS, Machuqueiro M, Darbre T, Baptista AM. Unraveling the Conformational Determinants of Peptide Dendrimers Using Molecular Dynamics Simulations. Macromolecules 2013. [DOI: 10.1021/ma401574b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Luís C. S. Filipe
- Instituto de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República,
EAN, 2780-157 Oeiras, Portugal
| | - Miguel Machuqueiro
- Centro de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, C8, 1749-016 Lisboa, Portugal
| | - Tamis Darbre
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - António M. Baptista
- Instituto de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República,
EAN, 2780-157 Oeiras, Portugal
| |
Collapse
|
11
|
Kłos JS, Sommer JU. Coarse grained simulations of neutral and charged dendrimers. POLYMER SCIENCE SERIES C 2013. [DOI: 10.1134/s1811238213070023] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
12
|
Tian WD, Ma YQ. Theoretical and computational studies of dendrimers as delivery vectors. Chem Soc Rev 2013; 42:705-27. [PMID: 23114420 DOI: 10.1039/c2cs35306g] [Citation(s) in RCA: 179] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
It is a great challenge for nanomedicine to develop novel dendrimers with maximum therapeutic potential and minimum side-effects for drug and gene delivery. As delivery vectors, dendrimers must overcome lots of barriers before delivering the bio-agents to the target in the cell. Extensive experimental investigations have been carried out to elucidate the physical and chemical properties of dendrimers and explore their behaviors when interacting with biomolecules, such as gene materials, proteins, and lipid membranes. As a supplement of the experimental techniques, it has been proved that computer simulations could facilitate the progress in understanding the delivery process of bioactive molecules. The structures of dendrimers in dilute solutions have been intensively investigated by monomer-resolved simulations, coarse-grained simulations, and atom-resolved simulations. Atomistic simulations have manifested that the hydrophobic interactions, hydrogen-bond interactions, and electrostatic attraction play critical roles in the formation of dendrimer-drug complexes. Multiscale simulations and statistical field theories have uncovered some physical mechanisms involved in the dendrimer-based gene delivery systems. This review will focus on the current status and perspective of theoretical and computational contributions in this field in recent years. (275 references).
Collapse
Affiliation(s)
- Wen-de Tian
- Center for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, China
| | | |
Collapse
|
13
|
Wu B, Liu Y, Li X, Mamontov E, Kolesnikov AI, Diallo SO, Do C, Porcar L, Hong K, Smith SC, Liu L, Smith GS, Egami T, Chen WR. Charge-Dependent Dynamics of a Polyelectrolyte Dendrimer and Its Correlation with Invasive Water. J Am Chem Soc 2013; 135:5111-7. [DOI: 10.1021/ja3125959] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bin Wu
- Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Yun Liu
- The NIST Center for Neutron
Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, United States
- Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716, United
States
| | | | | | | | | | | | - Lionel Porcar
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble CEDEX 9, France
| | | | | | - Li Liu
- Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | | | - Takeshi Egami
- Department of Materials Science
and Engineering and Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1508,
United States
| | | |
Collapse
|
14
|
Eleftheriou E, Karatasos K. Modeling the formation of ordered nano-assemblies comprised by dendrimers and linear polyelectrolytes: the role of Coulombic interactions. J Chem Phys 2013; 137:144905. [PMID: 23061863 DOI: 10.1063/1.4757666] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Models of mixtures of peripherally charged dendrimers with oppositely charged linear polyelectrolytes in the presence of explicit solvent are studied by means of molecular dynamics simulations. Under the influence of varying strength of electrostatic interactions, these systems appear to form dynamically arrested film-like interconnected structures in the polymer-rich phase. Acting like a pseudo-thermodynamic inverse temperature, the increase of the strength of the Coulombic interactions drive the polymeric constituents of the mixture to a gradual dynamic freezing-in. The timescale of the average density fluctuations of the formed complexes initially increases in the weak electrostatic regime reaching a finite limit as the strength of electrostatic interactions grow. Although the models are overall electrically neutral, during this process the dendrimer/linear complexes develop a polar character with an excess charge mainly close to the periphery of the dendrimers. The morphological characteristics of the resulted pattern are found to depend on the size of the polymer chains on account of the distinct conformational features assumed by the complexed linear polyelectrolytes of different length. In addition, the length of the polymer chain appears to affect the dynamics of the counterions, thus affecting the ionic transport properties of the system. It appears, therefore, that the strength of electrostatic interactions together with the length of the linear polyelectrolytes are parameters to which these systems are particularly responsive, offering thus the possibility for a better control of the resulted structure and the electric properties of these soft-colloidal systems.
Collapse
Affiliation(s)
- E Eleftheriou
- Physical Chemistry Laboratory, Chemical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | | |
Collapse
|
15
|
Wu B, Kerkeni B, Egami T, Do C, Liu Y, Wang Y, Porcar L, Hong K, Smith SC, Liu EL, Smith GS, Chen WR. Structured water in polyelectrolyte dendrimers: Understanding small angle neutron scattering results through atomistic simulation. J Chem Phys 2012; 136:144901. [DOI: 10.1063/1.3697479] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
16
|
Wu B, Li X, Do C, Kim TH, Shew CY, Liu Y, Yang J, Hong K, Porcar L, Chen CY, Liu EL, Smith GS, Herwig KW, Chen WR. Spatial distribution of intra-molecular water and polymeric components in polyelectrolyte dendrimers revealed by small angle scattering investigations. J Chem Phys 2011; 135:144903. [DOI: 10.1063/1.3651364] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
|
17
|
Karatasos K, Tanis I. Simulation of a Symmetric Binary Mixture of Charged Dendrimers Under Varying Electrostatic Interactions: Static and Dynamic Aspects. Macromolecules 2011. [DOI: 10.1021/ma2013282] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- K. Karatasos
- Physical Chemistry Laboratory, Chemical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - I. Tanis
- Physical Chemistry Laboratory, Chemical Engineering Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| |
Collapse
|
18
|
Kłos JS, Sommer JU. Simulations of Dendrimers with Flexible Spacer Chains and Explicit Counterions under Low and Neutral pH Conditions. Macromolecules 2010. [DOI: 10.1021/ma102055w] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- J. S. Kłos
- Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden, Germany
- Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
| | - J.-U. Sommer
- Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden, Germany
- Institute for Theoretical Physics, Technische Universität Dresden, 01069 Dresden, Germany
| |
Collapse
|
19
|
Liu Y, Porcar L, Hong K, Shew CY, Li X, Liu E, Butler PD, Herwig KW, Smith GS, Chen WR. Effect of counterion valence on the pH responsiveness of polyamidoamine dendrimer structure. J Chem Phys 2010; 132:124901. [PMID: 20370144 DOI: 10.1063/1.3358349] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
An accurate determination of the structure characteristics of protonated generation 5 polyamidoamine dendrimers in aqueous solution has been conducted by analyzing the small angle neutron scattering databased on a statistical mechanics model. In our investigation, the primary focus is to elucidate the effect of counterion valence on the counterion association and its impact on the intramolecular density profile within a dendrimer. In the range of our study for molecular protonation, a strong dependence of the structural properties of charged dendrimers on counterion valence is revealed. Our findings indicate that the association of a large amount of divalent counterions significantly reduces the effective charge of a dendrimer molecule. Surprisingly, no discernible transition of the density distribution profile is observed for the dendrimer charged by D(2)SO(4), as opposed to our previous observation of a pronounced transition in intramolecular density profile for the dendrimer charged by DCl. These findings may be understood from the thermodynamic processes of counterions.
Collapse
Affiliation(s)
- Yun Liu
- The NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Kłos JS, Sommer JU. Simulations of Terminally Charged Dendrimers with Flexible Spacer Chains and Explicit Counterions. Macromolecules 2010. [DOI: 10.1021/ma1003997] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- J. S. Kłos
- Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden, Germany
- Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
| | - J.-U. Sommer
- Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden, Germany
- Institute for Theoretical Physics, Technische Universität Dresden, 01069 Dresden, Germany
| |
Collapse
|
21
|
Maiti PK, Li Y, Cagin T, Goddard WA. Structure of polyamidoamide dendrimers up to limiting generations: a mesoscale description. J Chem Phys 2009; 130:144902. [PMID: 19368466 DOI: 10.1063/1.3105338] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The polyamidoamide (PAMAM) class of dendrimers was one of the first dendrimers synthesized by Tomalia and co-workers at Dow. Since its discovery the PAMAMs have stimulated many discussions on the structure and dynamics of such hyperbranched polymers. Many questions remain open because the huge conformation disorder combined with very similar local symmetries have made it difficult to characterize experimentally at the atomistic level the structure and dynamics of PAMAM dendrimers. The higher generation dendrimers have also been difficult to characterize computationally because of the large size (294,852 atoms for generation 11) and the huge number of conformations. To help provide a practical means of atomistic computational studies, we have developed an atomistically informed coarse-grained description for the PAMAM dendrimer. We find that a two-bead per monomer representation retains the accuracy of atomistic simulations for predicting size and conformational complexity, while reducing the degrees of freedom by tenfold. This mesoscale description has allowed us to study the structural properties of PAMAM dendrimer up to generation 11 for time scale of up to several nanoseconds. The gross properties such as the radius of gyration compare very well with those from full atomistic simulation and with available small angle x-ray experiment and small angle neutron scattering data. The radial monomer density shows very similar behavior with those obtained from the fully atomistic simulation. Our approach to deriving the coarse-grain model is general and straightforward to apply to other classes of dendrimers.
Collapse
Affiliation(s)
- Prabal K Maiti
- Center for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India.
| | | | | | | |
Collapse
|
22
|
Tanis I, Tragoudaras D, Karatasos K, Anastasiadis SH. Molecular Dynamics Simulations of a Hyperbranched Poly(ester amide): Statics, Dynamics, and Hydrogen Bonding. J Phys Chem B 2009; 113:5356-68. [DOI: 10.1021/jp8097999] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- I. Tanis
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece, Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 711 10 Heraklion, Crete, Greece, and Department of Chemistry, University of Crete, 710 03 Heraklion, Crete, Greece
| | - D. Tragoudaras
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece, Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 711 10 Heraklion, Crete, Greece, and Department of Chemistry, University of Crete, 710 03 Heraklion, Crete, Greece
| | - K. Karatasos
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece, Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 711 10 Heraklion, Crete, Greece, and Department of Chemistry, University of Crete, 710 03 Heraklion, Crete, Greece
| | - S. H. Anastasiadis
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece, Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 711 10 Heraklion, Crete, Greece, and Department of Chemistry, University of Crete, 710 03 Heraklion, Crete, Greece
| |
Collapse
|
23
|
Karatasos K, Krystallis M. Electrostatically-driven Ordering in Model Dendrimer Polyelectrolytes: Effects of Concentration. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/masy.200950405] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
24
|
Karatasos K, Krystallis M. Dynamics of counterions in dendrimer polyelectrolyte solutions. J Chem Phys 2009; 130:114903. [DOI: 10.1063/1.3088849] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
|
25
|
Lombardo D. Liquid-like ordering of negatively charged poly(amidoamine) (PAMAM) dendrimers in solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:3271-3275. [PMID: 19437728 DOI: 10.1021/la804234p] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A structural investigation in water solution of the sodium carboxylate-terminated (generation G3.5) Tomalia-type poly(amidoamine) dendrimers has been performed by means of the small angle X-ray scattering (SAXS) technique. A long-range intermolecular interaction, revealed by the presence of sharp peaks in SAXS spectra, gives evidence of a considerable structural order in the system, even at low concentration of the dispersed phase. The experimental interdendrimer structure factor S(q) was analyzed in the framework of the Ornstein-Zernike integral equation by using the hypernetted chain approximation (HNCA) as closure relation. The effective interdendrimer interaction, modeled as a screened Coulombic plus hard-sphere repulsion potential, allows the estimation of the dendrimers' effective surface charge Z(eff). The present analysis strongly supports the findings that the effective intra- and interdendrimer charge interactions, as well as the dendrimer solution environment conditions, are crucial parameters for the modulation of the degree of structural organization in solution, suitable for a number of potential applications.
Collapse
Affiliation(s)
- Domenico Lombardo
- CNR-IPCF, Istituto per i Processi Chimico Fisici, sez. Messina, C.da Papardo Salita Sperone s.n., I-98158 Messina, Italy.
| |
Collapse
|
26
|
Tanis I, Karatasos K. Molecular dynamics simulations of polyamidoamine dendrimers and their complexes with linear poly(ethylene oxide) at different pH conditions: static properties and hydrogen bonding. Phys Chem Chem Phys 2009; 11:10017-28. [DOI: 10.1039/b913986a] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
27
|
Porcar L, Liu Y, Verduzco R, Hong K, Butler PD, Magid LJ, Smith GS, Chen WR. Structural Investigation of PAMAM Dendrimers in Aqueous Solutions Using Small-Angle Neutron Scattering: Effect of Generation. J Phys Chem B 2008; 112:14772-8. [DOI: 10.1021/jp805297a] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lionel Porcar
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France; The NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; Department of Chemistry, the University of Tennessee, Knoxville, Tennessee 37996-1600; and Neutron Scattering
| | - Yun Liu
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France; The NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; Department of Chemistry, the University of Tennessee, Knoxville, Tennessee 37996-1600; and Neutron Scattering
| | - Rafael Verduzco
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France; The NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; Department of Chemistry, the University of Tennessee, Knoxville, Tennessee 37996-1600; and Neutron Scattering
| | - Kunlun Hong
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France; The NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; Department of Chemistry, the University of Tennessee, Knoxville, Tennessee 37996-1600; and Neutron Scattering
| | - Paul D. Butler
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France; The NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; Department of Chemistry, the University of Tennessee, Knoxville, Tennessee 37996-1600; and Neutron Scattering
| | - Linda J. Magid
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France; The NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; Department of Chemistry, the University of Tennessee, Knoxville, Tennessee 37996-1600; and Neutron Scattering
| | - Gregory S. Smith
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France; The NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; Department of Chemistry, the University of Tennessee, Knoxville, Tennessee 37996-1600; and Neutron Scattering
| | - Wei-Ren Chen
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France; The NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; Department of Chemistry, the University of Tennessee, Knoxville, Tennessee 37996-1600; and Neutron Scattering
| |
Collapse
|