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El Mohamad M, Han Q, Clulow AJ, Cao C, Safdar A, Stenzel M, Drummond CJ, Greaves TL, Zhai J. Regulating the structural polymorphism and protein corona composition of phytantriol-based lipid nanoparticles using choline ionic liquids. J Colloid Interface Sci 2024; 657:841-852. [PMID: 38091907 DOI: 10.1016/j.jcis.2023.12.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/29/2023] [Accepted: 12/01/2023] [Indexed: 01/02/2024]
Abstract
Lipid-based lyotropic liquid crystalline nanoparticles (LCNPs) face stability challenges in biological fluids during clinical translation. Ionic Liquids (ILs) have emerged as effective solvent additives for tuning the structure of LCNP's and enhancing their stability. We investigated the effect of a library of 21 choline-based biocompatible ILs with 9 amino acid anions as well as 10 other organic/inorganic anions during the preparation of phytantriol (PHY)-based LCNPs, followed by incubation in human serum and serum proteins. Small angle X-ray scattering (SAXS) results show that the phase behaviour of the LCNPs depends on the IL concentration and anion structure. Incubation with human serum led to a phase transition from the inverse bicontinuous cubic (Q2) to the inverse hexagonal (H2) mesophase, influenced by the specific IL present. Liquid chromatography-mass spectrometry (LC-MS) and proteomics analysis of selected samples, including PHY control and those with choline glutamate, choline hexanoate, and choline geranate, identified abundant proteins in the protein corona, including albumin, apolipoproteins, and serotransferrin. The composition of the protein corona varied among samples, shedding light on the intricate interplay between ILs, internal structure and surface chemistry of LCNPs, and biological fluids.
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Affiliation(s)
- Mohamad El Mohamad
- School of Science, STEM College, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia
| | - Qi Han
- School of Science, STEM College, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia
| | - Andrew J Clulow
- Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, VIC 3168, Australia
| | - Cheng Cao
- Centre for Advanced Macromolecular Design, School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Aneeqa Safdar
- Centre for Advanced Macromolecular Design, School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Martina Stenzel
- Centre for Advanced Macromolecular Design, School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Calum J Drummond
- School of Science, STEM College, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia.
| | - Tamar L Greaves
- School of Science, STEM College, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia.
| | - Jiali Zhai
- School of Science, STEM College, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia.
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Paporakis S, Brown SJ, Darmanin C, Seibt S, Adams P, Hassett M, Martin AV, Greaves TL. Lyotropic liquid crystal phases of monoolein in protic ionic liquids. J Chem Phys 2024; 160:024901. [PMID: 38189602 DOI: 10.1063/5.0180420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 11/26/2023] [Indexed: 01/09/2024] Open
Abstract
Monoolein-based liquid crystal phases are established media that are researched for various biological applications, including drug delivery. While water is the most common solvent for self-assembly, some ionic liquids (ILs) can support lipidic self-assembly. However, currently, there is limited knowledge of IL-lipid phase behavior in ILs. In this study, the lyotropic liquid crystal phase behavior of monoolein was investigated in six protic ILs known to support amphiphile self-assembly, namely ethylammonium nitrate, ethanolammonium nitrate, ethylammonium formate, ethanolammonium formate, ethylammonium acetate, and ethanolammonium acetate. These ILs were selected to identify specific ion effects on monoolein self-assembly, specifically increasing the alkyl chain length of the cation or anion, the presence of a hydroxyl group in the cation, and varying the anion. The lyotropic liquid crystal phases with 20-80 wt. % of monoolein were characterized over a temperature range from 25 to 65 °C using synchrotron small angle x-ray scattering and cross-polarized optical microscopy. These results were used to construct partial phase diagrams of monoolein in each of the six protic ILs, with inverse hexagonal, bicontinuous cubic, and lamellar phases observed. Protic ILs containing the ethylammonium cation led to monoolein forming lamellar and bicontinuous cubic phases, while those containing the ethanolammonium cation formed inverse hexagonal and bicontinuous cubic phases. Protic ILs containing formate and acetate anions favored bicontinuous cubic phases across a broader range of protic IL concentrations than those containing the nitrate anion.
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Affiliation(s)
- Stefan Paporakis
- School of Science, College of STEM, RMIT University, 124 La Trobe Street, Melbourne VIC 3000, Australia
| | - Stuart J Brown
- School of Science, College of STEM, RMIT University, 124 La Trobe Street, Melbourne VIC 3000, Australia
| | - Connie Darmanin
- La Trobe Institute for Molecular Science, Department of Mathematical and Physical Sciences, School of Computing Engineering and Mathematical Science, La Trobe University, Bundoora VIC 3086, Australia
| | - Susanne Seibt
- SAXS/WAXS Beamline, Australian Synchrotron, ANSTO, 800 Blackburn Road, VIC-3168 Clayton, Australia
| | - Patrick Adams
- School of Science, College of STEM, RMIT University, 124 La Trobe Street, Melbourne VIC 3000, Australia
| | - Michael Hassett
- School of Science, College of STEM, RMIT University, 124 La Trobe Street, Melbourne VIC 3000, Australia
| | - Andrew V Martin
- School of Science, College of STEM, RMIT University, 124 La Trobe Street, Melbourne VIC 3000, Australia
| | - Tamar L Greaves
- School of Science, College of STEM, RMIT University, 124 La Trobe Street, Melbourne VIC 3000, Australia
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