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Malec K, Monaco S, Delso I, Nestorowicz J, Kozakiewicz-Latała M, Karolewicz B, Khimyak YZ, Angulo J, Nartowski KP. Unravelling the mechanisms of drugs partitioning phenomena in micellar systems via NMR spectroscopy. J Colloid Interface Sci 2023; 638:135-148. [PMID: 36736115 DOI: 10.1016/j.jcis.2023.01.063] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 01/12/2023] [Indexed: 01/22/2023]
Abstract
Despite extensive use of micelles in materials and colloidal science, their supramolecular organization as well as host-guest interactions within these dynamic assemblies are poorly understood. Small guest molecules in the presence of micelles undergo constant exchange between a micellar aggregate and the surrounding solution, posing a considerable challenge for their molecular level characterisation. In this work we reveal the interaction maps between small guest molecules and surfactants forming micelles via novel applications of NMR techniques supported with state-of-the-art analytical methods used in colloidal science. Model micelles composed of structurally distinct surfactants (block non-ionic polymer Pluronic® F-127, non-ionic surfactant Tween 20 or Tween 80, and ionic surfactant sodium lauryl sulphate, SLS) were selected and loaded with model small molecules of biological relevance (i.e. the drugs fluconazole, FLU or indomethacin, IMC) known to have different partition coefficients. Molecular level organization of FLU or IMC within hydrophilic and hydrophobic domains of micellar aggregates was established using the combination of NMR methods (1D 1H NMR, 1D 19F NMR, 2D 1H-1H NOESY and 2D 1H-19F HOESY, and the multifrequency-STD NMR) and corroborated with molecular dynamics (MD) simulations. This is the first application of multifrequency-STD NMR to colloidal systems, enabling us to elucidate intricately detailed patterns of drug/micelle interactions in a single NMR experiment within minutes. Importantly, our results indicate that flexible surfactants, such as block copolymers and polysorbates, form micellar aggregates with a surface composed of both hydrophilic and hydrophobic domains and do not follow the classical core-shell model of the micelle. We propose that the magnitude of changes in 1H chemical shifts corroborated with interaction maps obtained from DEEP-STD NMR and 2D NMR experiments can be used as an indicator of the strength of the guest-surfactant interactions. This NMR toolbox can be adopted for the analysis of broad range of colloidal host-guest systems from soft materials to biological systems.
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Affiliation(s)
- Katarzyna Malec
- Department of Drug Form Technology, Faculty of Pharmacy, Wroclaw Medical University, 211a Borowska Str, 50-556 Wroclaw, Poland
| | - Serena Monaco
- School of Pharmacy, University of East Anglia, Chancellors Drive, NR4 7TJ Norwich, UK
| | - Ignacio Delso
- School of Pharmacy, University of East Anglia, Chancellors Drive, NR4 7TJ Norwich, UK
| | - Justyna Nestorowicz
- Department of Drug Form Technology, Faculty of Pharmacy, Wroclaw Medical University, 211a Borowska Str, 50-556 Wroclaw, Poland
| | - Marta Kozakiewicz-Latała
- Department of Drug Form Technology, Faculty of Pharmacy, Wroclaw Medical University, 211a Borowska Str, 50-556 Wroclaw, Poland
| | - Bożena Karolewicz
- Department of Drug Form Technology, Faculty of Pharmacy, Wroclaw Medical University, 211a Borowska Str, 50-556 Wroclaw, Poland
| | - Yaroslav Z Khimyak
- School of Pharmacy, University of East Anglia, Chancellors Drive, NR4 7TJ Norwich, UK.
| | - Jesús Angulo
- School of Pharmacy, University of East Anglia, Chancellors Drive, NR4 7TJ Norwich, UK; Instituto de Investigaciones Químicas (CSIC-US), Avda. Américo Vespucio, 49, Sevilla 41092, Spain.
| | - Karol P Nartowski
- Department of Drug Form Technology, Faculty of Pharmacy, Wroclaw Medical University, 211a Borowska Str, 50-556 Wroclaw, Poland; School of Pharmacy, University of East Anglia, Chancellors Drive, NR4 7TJ Norwich, UK.
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Weng T, Wang L, Liu Y, Zhang X, Wu Y, Zhang Y, Han J, Liu M. Interaction of bisdemethoxycurcumin with sodium dodecyl sarcosine + Tween 20/Tween 60 mixed surfactants: Insights from multispectral analysis and solubilization effect. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Law MK, Zhao Y, Zhang W, Wang R, Shi M, Zhang Y, Chen S, Yang J. Highly transparent and super-wettable nanocoatings hybridized with isocyanate-silane modified surfactant for multifunctional applications. NANO MATERIALS SCIENCE 2021. [DOI: 10.1016/j.nanoms.2021.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Liu Y, Liu M, Yan H, Liu H, Liu J, Zhao Y, Wu Y, Zhang Y, Han J. Enhanced solubility of bisdemethoxycurcumin by interaction with Tween surfactants: Spectroscopic and coarse-grained molecular dynamics simulation studies. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.115073] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Curia S, Howdle SM. Towards sustainable polymeric nano-carriers and surfactants: facile low temperature enzymatic synthesis of bio-based amphiphilic copolymers in scCO2. Polym Chem 2016. [DOI: 10.1039/c6py00066e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We demonstrate that useful bio-based amphiphilic polymers can be produced enzymatically at a mild temperature, in a solvent-free system and using renewably sourced monomers, by exploiting the unique properties of supercritical CO2(scCO2).
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Affiliation(s)
- S. Curia
- University of Nottingham
- School of Chemistry
- University Park
- Nottingham
- UK
| | - S. M. Howdle
- University of Nottingham
- School of Chemistry
- University Park
- Nottingham
- UK
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Schmidt J, Ehasz C, Epperson M, Klas K, Wyatt J, Hennig M, Forconi M. The effect of the hydrophobic environment on the retro-aldol reaction: comparison to a computationally-designed enzyme. Org Biomol Chem 2013; 11:8419-25. [PMID: 24189834 PMCID: PMC3919508 DOI: 10.1039/c3ob41898g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recent work on a computationally-designed retroaldolase RA-61 suggested that most of the rate-acceleration brought about by this enzyme was due to non-specific interactions with the aromatic substrate. To provide a benchmark for the role of non-specific interactions in this system, we measured the second-order rate constant for the amine-catalysed retro-aldol reaction of methodol in the presence of non-specific hydrophobic pockets such as micelles. We found that a simple micellar system, that consists of a positively-charged surfactant and a long-chain amine, can accelerate the retro-aldol reaction of methodol by 9500-fold. This effect rivals the 10(5)-fold rate acceleration of RA-61. Similar results were obtained with BSA used as the catalyst, implying that the retro-aldol reaction of methodol can be greatly accelerated by non-specific hydrophobic pockets that contain an amino group.
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Affiliation(s)
- Joshua Schmidt
- College of Charleston, Department of Chemistry and Biochemistry, 66 George Street, Charleston, SC 29424, USA.
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Dhar S, Rana DK, Bhattacharya SC. Influence of nanoscopic micellar confinements on spectroscopic probing and rotational dynamics of an antioxidative naphthalimide derivative. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.03.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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di Cagno M, Stein PC, Styskala J, Hlaváč J, Skalko-Basnet N, Bauer-Brandl A. Overcoming instability and low solubility of new cytostatic compounds: a comparison of two approaches. Eur J Pharm Biopharm 2011; 80:657-62. [PMID: 22142591 DOI: 10.1016/j.ejpb.2011.11.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2011] [Revised: 11/18/2011] [Accepted: 11/20/2011] [Indexed: 12/19/2022]
Abstract
The pharmaceutical use of some 3-hydroxyquinolinone derivatives with high cytotoxic and cytostatic activities (under in vitro conditions) as well as potential immunosuppressive properties is seriously limited by their low solubility in water accompanied by instability in oxidative environment, like physiological fluids. In an attempt to improve the bioavailability and the stability of four of these derivatives, we propose here two different approaches: complexation with β-cyclodextrin derivatives and incorporation of these substances inside antioxidant micelles. The comparison of the two different methods is the focus of this work, as well as the investigation of some physicochemical properties of the micellar aqueous dispersions. Antioxidant micellar dispersions appear to be suitable for increasing the apparent solubility and stability for all the compounds studied, most probably because of the antioxidant activity of the specific surfactant used, combined with the low amount of water present in the center of the micelles. On this regard, (1)H NMR and UV-vis spectroscopy result as efficient tools to verify that the drug molecules are indeed placed in the core of the micelles. Moreover, freeze-drying provides a very easy and powerful technique to obtain solid formulations starting from micellar dispersions. On the contrary, cyclodextrins could potentially be used as solubilizing agents, but the drawback connected to degradation in aqueous media could not be overcome with this type of solubilizer.
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Affiliation(s)
- Massimiliano di Cagno
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Odense, Denmark
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