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Faisal KS, Clulow AJ, Krasowska M, Gillam T, Miklavcic SJ, Williamson NH, Blencowe A. Interrogating the relationship between the microstructure of amphiphilic poly(ethylene glycol-b-caprolactone) copolymers and their colloidal assemblies using non-interfering techniques. J Colloid Interface Sci 2022; 606:1140-1152. [PMID: 34492457 DOI: 10.1016/j.jcis.2021.08.084] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/20/2021] [Accepted: 08/10/2021] [Indexed: 10/20/2022]
Abstract
Understanding the microstructural parameters of amphiphilic copolymers that control the formation and structure of aggregated colloids (e.g., micelles) is essential for the rational design of hierarchically structured systems for applications in nanomedicine, personal care and food formulations. Although many analytical techniques have been employed to study such systems, in this investigation we adopted an integrated approach using non-interfering techniques - diffusion nuclear magnetic resonance (NMR) spectroscopy, dynamic light scattering (DLS) and synchrotron small-angle X-ray scattering (SAXS) - to probe the relationship between the microstructure of poly(ethylene glycol-b-caprolactone) (PEG-b-PCL) copolymers [e.g., block molecular weight (MW) and the mass fraction of PCL (fPCL)] and the structure of their aggregates. Systematic trends in the self-assembly behaviour were determined using a large family of well-defined block copolymers with variable PEG and PCL block lengths (number-average molecular weights (Mn) between 2 and 10 and 0.5-15 kDa, respectively) and narrow dispersity (Ð < 1.12). For all of the copolymers, a clear transition in the aggregate structure was observed when the hydrophobic fPCL was increased at a constant PEG block Mn, although the nature of this transition is also dependent on the PEG block Mn. Copolymers with low Mn PEG blocks (2 kDa) were observed to transition from unimers and loosely associated unimers to metastable aggregates and finally, to cylindrical micelles as the fPCL was increased. In comparison, copolymers with PEG block Mn of between 5 and 10 kDa transitioned from heterogenous metastable aggregates to cylindrical micelles and finally, well-defined ellipsoidal micelles (of decreasing aspect ratios) as the fPCL was increased. In all cases, the diffusion NMR spectroscopy, DLS and synchrotron SAXS results provided complementary information and the grounds for a phase diagram relating copolymer microstructure to aggregation behaviour and structure. Importantly, the absence of commonly depicted spherical micelles has implications for applications where properties may be governed by shape, such as, cellular uptake of nanomedicine formulations.
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Affiliation(s)
- Khandokar Sadique Faisal
- Applied Chemistry and Translational Biomaterials (ACTB) Group, UniSA CHS, University of South Australia, Adelaide, South Australia 5000, Australia
| | - Andrew J Clulow
- Drug Delivery, Disposition & Dynamics, Monash Institute of Pharmaceutical Sciences, 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Marta Krasowska
- Surface Interactions and Soft Matter (SISM) Group, Future Industries Institute, UniSA STEM, University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - Todd Gillam
- Applied Chemistry and Translational Biomaterials (ACTB) Group, UniSA CHS, University of South Australia, Adelaide, South Australia 5000, Australia; Surface Interactions and Soft Matter (SISM) Group, Future Industries Institute, UniSA STEM, University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - Stanley J Miklavcic
- Phenomics and Bioinformatics Research Centre, UniSA STEM, University of South Australia, Mawson Lakes, South Australia 5095, Australia
| | - Nathan H Williamson
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA.
| | - Anton Blencowe
- Applied Chemistry and Translational Biomaterials (ACTB) Group, UniSA CHS, University of South Australia, Adelaide, South Australia 5000, Australia.
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Kainourgiakis E, Samios J. A study of the micellar aggregation of aqueous N,N,N-decyltrimethyl ammonium chloride via extended microsecond-time atomistic molecular dynamics simulation and realistic potential models. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115644] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Honegger P, Schmollngruber M, Hagn G, Baig O, von Baeckmann C, Steinhauser O, Schröder C. Molecular dynamics simulation of aqueous 1‑dodecyl‑3‑methylimidazolium chloride: Emerging micelles. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.09.110] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Seki T, Arai N, Suh D, Ozawa T, Shimada T, Yasuoka K, Hotta A. Self-assembly of peptide amphiphiles by vapor pressure osmometry and dissipative particle dynamics. RSC Adv 2018; 8:26461-26468. [PMID: 35541069 PMCID: PMC9083093 DOI: 10.1039/c8ra04692a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 07/16/2018] [Indexed: 11/21/2022] Open
Abstract
Peptide amphiphiles are one of the most promising materials in the biomedical field, so much effort has been devoted to characterizing the mechanism of their self-assembly and thermosensitive gelation. In this work, vapor pressure osmometry measurements were carried out to parameterize the thermosensitivity of interactions between peptide amphiphiles in an aqueous solution. The osmometry measurement verified that the peptides became more hydrophobic as temperature increased, which was quantitatively described with the Flory-Huggins χ parameter. Thereafter, a coarse-grained molecular model was used to simulate peptide amphiphiles dissolved in an aqueous solution. The temperature sensitive coarse-grained parameter a HW, which is the repulsive force between the hydrophilic head of the peptide amphiphile and water was estimated from the aforementioned experimentally obtained χ. Furthermore, the effects of concentration and temperature on the self-assembly behavior of peptide amphiphiles were quantitatively studied by dissipative particle dynamics. The simulation results revealed that a HW plays an important role in self-assembly characteristics and in the resulting microstructure of the peptide amphiphiles, which coincides with previous experimental and computational findings. The methodology in quantitatively linking the coarse-grained parameter from experiment and theory provides a sensible foundation for bridging future simulation studies with experimental work on macromolecules.
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Affiliation(s)
- Taiga Seki
- Department of Mechanical Engineering, Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Noriyoshi Arai
- Department of Mechanical Engineering, Kindai University 3-4-1 Kowakae Higashiosaka Osaka 577-8522 Japan
- Research Institute for Science and Technology, Kindai University 3-4-1 Kowakae Higashiosaka Osaka 577-8522 Japan
| | - Donguk Suh
- Department of Mechanical Engineering, University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - Taku Ozawa
- Materials Science Section, Engineering Technology Division, JSOL Corporation Harumi Center Bldg., 2-5-24, Harumi Chuo-ku Tokyo 104-0053 Japan
| | - Tomoko Shimada
- Asahi-Kasei Corporation 1-105 Jimbocho, Kanda Chiyoda-ku Tokyo 100-8101 Japan
| | - Kenji Yasuoka
- Department of Mechanical Engineering, Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Atsushi Hotta
- Department of Mechanical Engineering, Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
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Gao R, He X, Shao Y, Hu Y, Zhang H, Liu Z, Liu B. Effects of Branch Content and Branch Length on Polyethylene Crystallization: Molecular Dynamics Simulation. MACROMOL THEOR SIMUL 2016. [DOI: 10.1002/mats.201500089] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rui Gao
- State Key Laboratory of Chemical Engineering; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Xuelian He
- State Key Laboratory of Chemical Engineering; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Yunqi Shao
- State Key Laboratory of Chemical Engineering; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Yanling Hu
- State Key Laboratory of Chemical Engineering; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Haiyang Zhang
- State Key Laboratory of Chemical Engineering; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Zhen Liu
- State Key Laboratory of Chemical Engineering; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
| | - Boping Liu
- State Key Laboratory of Chemical Engineering; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 P. R. China
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Giampaolo AD, Cerichelli G, Chiarini M, Daidone I, Aschi M. Structure and solvation properties of aqueous sulfobetaine micelles in the presence of organic spin probes: a Molecular Dynamics simulation study. Struct Chem 2013. [DOI: 10.1007/s11224-013-0207-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Fujiwara S, Hashimoto M, Itoh T, Horiuchi R. Micellar Shape Change in Amphiphilic Solution: A Molecular Dynamics Study. CHEM LETT 2012. [DOI: 10.1246/cl.2012.1038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Susumu Fujiwara
- Department of Macromolecular Science and Engineering, Kyoto Institute of Technology
| | - Masato Hashimoto
- Department of Macromolecular Science and Engineering, Kyoto Institute of Technology
| | - Takashi Itoh
- Department of Macromolecular Science and Engineering, Kyoto Institute of Technology
| | - Ritoku Horiuchi
- Fundamental Physics Simulation Research Division, National Institute for Fusion Science
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Gogonea V, Wu Z, Lee X, Pipich V, Li XM, Ioffe AI, Didonato JA, Hazen SL. Congruency between biophysical data from multiple platforms and molecular dynamics simulation of the double-super helix model of nascent high-density lipoprotein. Biochemistry 2010; 49:7323-43. [PMID: 20687589 DOI: 10.1021/bi100588a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The predicted structure and molecular trajectories from >80 ns molecular dynamics simulation of the solvated Double-Super Helix (DSH) model of nascent high-density lipoprotein (HDL) were determined and compared with experimental data on reconstituted nascent HDL obtained from multiple biophysical platforms, including small angle neutron scattering (SANS) with contrast variation, hydrogen-deuterium exchange tandem mass spectrometry (H/D-MS/MS), nuclear magnetic resonance spectroscopy (NMR), cross-linking tandem mass spectrometry (MS/MS), fluorescence resonance energy transfer (FRET), electron spin resonance spectroscopy (ESR), and electron microscopy. In general, biophysical constraints experimentally derived from the multiple platforms agree with the same quantities evaluated using the simulation trajectory. Notably, key structural features postulated for the recent DSH model of nascent HDL are retained during the simulation, including (1) the superhelical conformation of the antiparallel apolipoprotein A1 (apoA1) chains, (2) the lipid micellar-pseudolamellar organization, and (3) the solvent-exposed Solar Flare loops, proposed sites of interaction with LCAT (lecithin cholesteryl acyltransferase). Analysis of salt bridge persistence during simulation provides insights into structural features of apoA1 that forms the backbone of the lipoprotein. The combination of molecular dynamics simulation and experimental data from a broad range of biophysical platforms serves as a powerful approach to studying large macromolecular assemblies such as lipoproteins. This application to nascent HDL validates the DSH model proposed earlier and suggests new structural details of nascent HDL.
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Affiliation(s)
- Valentin Gogonea
- Department of Chemistry, Cleveland State University, Cleveland, Ohio 44115, USA.
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Fujiwara S, Itoh T, Hashimoto M, Horiuchi R. Molecular dynamics simulation of amphiphilic molecules in solution: Micelle formation and dynamic coexistence. J Chem Phys 2009; 130:144901. [DOI: 10.1063/1.3105341] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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FUJIWARA S, HASHIMOTO M, ITOH T. Molecular Dynamics Simulations for Structure Formation of Polymers and Self-Assembly of Amphiphilic Molecules. KOBUNSHI RONBUNSHU 2009. [DOI: 10.1295/koron.66.396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Susumu FUJIWARA
- Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology
| | - Masato HASHIMOTO
- Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology
| | - Takashi ITOH
- Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology
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