1
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Di Spirito N, Grizzuti N, Lutz-Bueno V, Urciuoli G, Auriemma F, Pasquino R. Pluronic F68 Micelles as Carriers for an Anti-Inflammatory Drug: A Rheological and Scattering Investigation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1544-1554. [PMID: 38166478 PMCID: PMC10795184 DOI: 10.1021/acs.langmuir.3c03682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 12/14/2023] [Accepted: 12/15/2023] [Indexed: 01/04/2024]
Abstract
Age-long ambition of medical scientists has always been advancement in healthcare and therapeutic medicine. Biomedical research indeed claims paramount importance in nanomedicine and drug delivery, and the development of biocompatible storage structures for delivering drugs stands at the heart of emerging scientific works. The delivery of drugs into the human body is nevertheless a nontrivial and challenging task, and it is often addressed by using amphiphilic compounds as nanosized delivery vehicles. Pluronics belong to a peculiar class of biocompatible and thermosensitive nonionic amphiphilic copolymers, and their self-assemblies are employed as drug delivery excipients because of their unique properties. We herein report on the encapsulation of diclofenac sodium within Pluronic F68 self-assemblies in water, underpinning the impact of the drug on the rheological and microstructural evolution of pluronic-based systems. The self-assembly and thermoresponsive micellization were studied through isothermal steady rheological experiments at different temperatures on samples containing 45 wt % Pluronic F68 and different amounts of diclofenac sodium. The adoption of scattering techniques, small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS), allowed for the description of the system features at the nanometer length scale, providing information about the characteristic size of each part of the micellar structures as a function of temperature and drug concentration. Diclofenac sodium is not a good fellow for Pluronic F68. The triblock copolymer aids the encapsulation of the drug, highly improving its water solubility, whereas diclofenac sodium somehow hinders Pluronic self-assembly. By using a simple empirical model and no fitting parameters, the steady viscosity can be predicted, although qualitatively, through the volume fraction of the micelles extracted through scattering techniques and compared to the rheological one. A tunable control of the viscous behavior of such biomedical systems may be achieved through the suitable choice of their composition.
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Affiliation(s)
| | - Nino Grizzuti
- DICMaPI, Università degli Studi di Napoli Federico II, P. le Tecchio 80, 80125 Napoli, Italy
| | - Viviane Lutz-Bueno
- Laboratory
for Neutron Scattering & Imaging, Paul
Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Gaia Urciuoli
- Dipartimento
di Scienze Chimiche, Università di
Napoli “Federico II”, Complesso Monte S. Angelo, via Cintia, 80126 Napoli, Italy
| | - Finizia Auriemma
- Dipartimento
di Scienze Chimiche, Università di
Napoli “Federico II”, Complesso Monte S. Angelo, via Cintia, 80126 Napoli, Italy
| | - Rossana Pasquino
- DICMaPI, Università degli Studi di Napoli Federico II, P. le Tecchio 80, 80125 Napoli, Italy
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2
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Pigliacelli C, Belton P, Wilde P, Bombelli FB, Kroon PA, Winterbone MS, Qi S. Interaction of polymers with bile salts - Impact on solubilisation and absorption of poorly water-soluble drugs. Colloids Surf B Biointerfaces 2023; 222:113044. [PMID: 36436403 DOI: 10.1016/j.colsurfb.2022.113044] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 11/01/2022] [Accepted: 11/18/2022] [Indexed: 11/21/2022]
Abstract
Formulating poorly soluble drugs with polymers in the form of solid dispersions has been widely used for improving drug dissolution. Endogenous surface-active species present in the gut, such as bile salts, lecithin and other phospholipids, have been shown to play a key role in facilitating lipids and poorly soluble drugs solubilisation in the gut. In this study, we examined the possible occurrence of interactions between a model bile salt, sodium taurocholate (NaTC), and model spray dried solid dispersions comprising piroxicam and Hydroxypropyl Methylcellulose (HPMC), a commonly used hydrophilic polymer for solid dispersion preparation. Solubility measurements revealed the good solubilisation effect of NaTC on the crystalline drug, which was enhanced by the addition of HPMC, and further boosted by the drug formulation into solid dispersion. The colloidal behaviour of the solid dispersions upon dissolution in biorelevant media, with and without NaTC, revealed the formation of NaTC-HPMC complexes and other mixed colloidal species. Cellular level drug absorption studies obtained using Caco-2 monolayers confirmed that the combination of drug being delivered by solid dispersion and the presence of bile salt and lecithin significantly contributed to the improved drug absorption. Together with the role of NaTC-HPMC complexes in assisting the drug solubilisation, our results also highlight the complex interplay between bile salts, excipients and drug absorption.
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Affiliation(s)
- Claudia Pigliacelli
- School of Pharmacy, University of East Anglia, Norwich, Norfolk NR4 7TJ, UK; Dipartimento di Chimica, Materiali ed Ingegneria Chimica "G. Natta", Politecnico di Milano, Via Mancinelli 7, 20131 Milan, Italy.
| | - Peter Belton
- School of Chemistry, University of East Anglia, Norwich, Norfolk NR4 7TJ, UK
| | - Peter Wilde
- Quadram Institute Bioscience, Norwich Research Park, Norwich, Norfolk NR4 7UQ, UK
| | - Francesca Baldelli Bombelli
- Dipartimento di Chimica, Materiali ed Ingegneria Chimica "G. Natta", Politecnico di Milano, Via Mancinelli 7, 20131 Milan, Italy
| | - Paul A Kroon
- Quadram Institute Bioscience, Norwich Research Park, Norwich, Norfolk NR4 7UQ, UK
| | - Mark S Winterbone
- Quadram Institute Bioscience, Norwich Research Park, Norwich, Norfolk NR4 7UQ, UK
| | - Sheng Qi
- School of Pharmacy, University of East Anglia, Norwich, Norfolk NR4 7TJ, UK.
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3
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Parekh PY, Patel VI, Khimani MR, Bahadur P. Self-assembly of bile salts and their mixed aggregates as building blocks for smart aggregates. Adv Colloid Interface Sci 2023; 312:102846. [PMID: 36736167 DOI: 10.1016/j.cis.2023.102846] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 01/11/2023] [Accepted: 01/22/2023] [Indexed: 01/27/2023]
Abstract
The present communication offers a comprehensive overview of the self-assembly of bile salts emphasizing their mixed smart aggregates with a variety of amphiphiles. Using an updated literature survey, we have explored the dissimilar interactions of bile salts with different types of surfactants, phospholipids, ionic liquids, drugs, and a variety of natural and synthetic polymers. While assembling this review, special attention was also provided to the potency of bile salts to alter the size/shape of aggregates formed by several amphiphiles to use these aggregates for solubility improvement of medicinally important compounds, active pharmaceutical ingredients, and also to develop their smart delivery vehicles. A fundamental understanding of bile salt mixed aggregates will enable the development of new strategies for improving the bioavailability of drugs solubilized in newly developed potential hosts and to formulate smart aggregates of desired morphology for specific targeted applications. It enriches our existing knowledge of the distinct interactions exerted in mixed systems of bile salts with variety of amphiphiles. By virtue of this, researchers can get innovative ideas to construct novel nanoaggregates from bile salts by incorporating various amphiphiles that serve as a building block for smart aggregates for their numerous industrial applications.
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Affiliation(s)
- Paresh Y Parekh
- Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, Gujarat, India
| | - Vijay I Patel
- Department of Chemistry, Navyug Science College, Rander Road, Surat 395009, Gujarat, India.
| | - Mehul R Khimani
- Countryside International School, Nr. Bhesan Railway Crossing, CIS Barbodhan Road, Surat 394125, Gujarat, India
| | - Pratap Bahadur
- Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, Gujarat, India
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4
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Chakrabarti C, Malek N, Ray D, Aswal VK, Pillai SA. A meticulous study on the interaction of bile salts with star block copolymeric micelles. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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5
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McAfee T, Ferron T, Cordova IA, Pickett PD, McCormick CL, Wang C, Collins BA. Label-free characterization of organic nanocarriers reveals persistent single molecule cores for hydrocarbon sequestration. Nat Commun 2021; 12:3123. [PMID: 34035289 PMCID: PMC8149835 DOI: 10.1038/s41467-021-23382-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 04/23/2021] [Indexed: 02/04/2023] Open
Abstract
Self-assembled molecular nanostructures embody an enormous potential for new technologies, therapeutics, and understanding of molecular biofunctions. Their structure and function are dependent on local environments, necessitating in-situ/operando investigations for the biggest leaps in discovery and design. However, the most advanced of such investigations involve laborious labeling methods that can disrupt behavior or are not fast enough to capture stimuli-responsive phenomena. We utilize X-rays resonant with molecular bonds to demonstrate an in-situ nanoprobe that eliminates the need for labels and enables data collection times within seconds. Our analytical spectral model quantifies the structure, molecular composition, and dynamics of a copolymer micelle drug delivery platform using resonant soft X-rays. We additionally apply this technique to a hydrocarbon sequestrating polysoap micelle and discover that the critical organic-capturing domain does not coalesce upon aggregation but retains distinct single-molecule cores. This characteristic promotes its efficiency of hydrocarbon sequestration for applications like oil spill remediation and drug delivery. Such a technique enables operando, chemically sensitive investigations of any aqueous molecular nanostructure, label-free.
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Affiliation(s)
- Terry McAfee
- grid.30064.310000 0001 2157 6568Department of Physics and Astronomy, Washington State University, Pullman, WA USA ,grid.184769.50000 0001 2231 4551Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, NC USA
| | - Thomas Ferron
- grid.30064.310000 0001 2157 6568Department of Physics and Astronomy, Washington State University, Pullman, WA USA
| | - Isvar A. Cordova
- grid.184769.50000 0001 2231 4551Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, NC USA
| | - Phillip D. Pickett
- grid.267193.80000 0001 2295 628XSchool of Polymer Science and Engineering, University of Southern Mississippi, Hattiesburg, MS USA
| | - Charles L. McCormick
- grid.267193.80000 0001 2295 628XSchool of Polymer Science and Engineering, University of Southern Mississippi, Hattiesburg, MS USA
| | - Cheng Wang
- grid.184769.50000 0001 2231 4551Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, NC USA
| | - Brian A. Collins
- grid.30064.310000 0001 2157 6568Department of Physics and Astronomy, Washington State University, Pullman, WA USA
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6
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Fornasier M, Pireddu R, Del Giudice A, Sinico C, Nylander T, Schillén K, Galantini L, Murgia S. Tuning lipid structure by bile salts: Hexosomes for topical administration of catechin. Colloids Surf B Biointerfaces 2021; 199:111564. [DOI: 10.1016/j.colsurfb.2021.111564] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/24/2020] [Accepted: 01/03/2021] [Indexed: 12/21/2022]
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7
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Morita T, Mukaide S, Chen Z, Higashi K, Imamura H, Moribe K, Sumi T. Unveiling the Interaction Potential Surface between Drug-Entrapped Polymeric Micelles Clarifying the High Drug Nanocarrier Efficiency. NANO LETTERS 2021; 21:1303-1310. [PMID: 33480258 DOI: 10.1021/acs.nanolett.0c03978] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Polymeric micelles are invaluable media as drug nanocarriers. Although knowledge of an interaction between the micelles is a key to understanding the mechanisms and developing the superior functions, the interaction potential surface between drug-incorporated polymeric micelles has not yet been quantitatively evaluated due to the extremely complex structure. Here, the interaction potential surface between drug-entrapped polymeric micelles was unveiled by combining a small-angle scattering experiment and a model-potential-free liquid-state theory. Triblock copolymer composed of poly(ethylene oxide) and poly(propylene oxide) was investigated over a wide concentration range (0.5-10.0 wt %). Effects of the entrapment of a water-insoluble hydrophobic drug, cyclosporin A, on the interaction were explored by comparing the interactions with and without the drug. The results directly clarified the high drug carrier efficiency in terms of the interaction between the micelles. In addition, an investigation based on density functional theory provided a deeper insight into the monomer contribution to the extremely stable dispersion of the nanocarrier.
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Affiliation(s)
- Takeshi Morita
- Graduate School of Science, Chiba University, Chiba 263-8522, Japan
| | - Sayaka Mukaide
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Ziqiao Chen
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Kenjirou Higashi
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Hiroshi Imamura
- College of Life Sciences, Ritsumeikan University, Shiga 525-8577, Japan
| | - Kunikazu Moribe
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Tomonari Sumi
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
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8
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Myhre S, Amann M, Willner L, Knudsen KD, Lund R. How Detergents Dissolve Polymeric Micelles: Kinetic Pathways of Hybrid Micelle Formation in SDS and Block Copolymer Mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12887-12899. [PMID: 32960616 PMCID: PMC7660944 DOI: 10.1021/acs.langmuir.0c02123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 09/22/2020] [Indexed: 06/11/2023]
Abstract
Mixtures of amphiphilic polymers and surfactants are used in a wide range of applications, e.g., pharmaceuticals, detergents, cosmetics, and drug delivery systems. Still, many questions remain on how the structure and, in particular, the kinetics of block copolymer micelles are affected in the presence of surfactants and what controls the solubilization kinetics. In this work, we have studied the stability and solubilization kinetics of block copolymer micelles upon the addition of the surfactant sodium dodecyl sulfate (SDS) using small-angle X-ray/neutron scattering. The ability of the surfactant to dissolve polymer micelles or form mixed micelles has been investigated using two types of amphiphilic polymers, poly(ethylene-alt-propylene)-poly(ethylene oxide) (PEP1-PEO20) and n-alkyl-functionalized PEO (C28-PEO5). The exchange kinetics of C28-PEO5 micelles are in the order of hours, while PEP1-PEO20 micelles are known to be frozen on a practical timescale. In this work, we show that the addition of SDS to PEP1-PEO20 provides virtually no solubilization, even after an extended period of time. However, upon adding SDS to C28-PEO5 micelles, we observe micellar dissolution and formation of mixed micelles occurring on the timescale of hours. Using a coexistence model of mixed and neat micelles, the SAXS data were analyzed to provide detailed structural parameters over time. First, we observe a fast fragmentation/fission step followed by a slow reorganization process. The latter process is essentially independent of concentration at low volume fraction but is greatly accelerated at larger concentrations. This might indicate a crossover from a predominance of molecular exchange to fusion/fission processes.
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Affiliation(s)
- Synne Myhre
- Department
of Chemistry, University of Oslo, Oslo 0315, Norway
| | - Matthias Amann
- Department
of Chemistry, University of Oslo, Oslo 0315, Norway
| | - Lutz Willner
- Jülich
Centre for Neutron Science (JCNS-1) and Institute of Biological Information
Processing (IBI-8) Forschungszentrum Jülich GmbH, Jülich 52425, Germany
| | - Kenneth D. Knudsen
- IFE, Institute
for Energy Technology, Instituttveien 18, Kjeller 2007, Norway
| | - Reidar Lund
- Department
of Chemistry, University of Oslo, Oslo 0315, Norway
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9
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Synergistic and antagonistic effects of non-ionic surfactants with bile salt + phospholipid mixed micelles on the solubility of poorly water-soluble drugs. Int J Pharm 2020; 588:119762. [DOI: 10.1016/j.ijpharm.2020.119762] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 07/31/2020] [Accepted: 08/09/2020] [Indexed: 01/08/2023]
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10
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Du G, Del Giudice A, Alfredsson V, Carnerup AM, Pavel NV, Loh W, Masci G, Nyström B, Galantini L, Schillén K. Effect of temperature on the association behavior in aqueous mixtures of an oppositely charged amphiphilic block copolymer and bile salt. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122871] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Tasca E, Andreozzi P, Del Giudice A, Galantini L, Schillén K, Maria Giuliani A, Ramirez MDLA, Moya SE, Giustini M. Poloxamer/sodium cholate co-formulation for micellar encapsulation of doxorubicin with high efficiency for intracellular delivery: An in-vitro bioavailability study. J Colloid Interface Sci 2020; 579:551-561. [PMID: 32623121 DOI: 10.1016/j.jcis.2020.06.096] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 06/15/2020] [Accepted: 06/22/2020] [Indexed: 01/04/2023]
Abstract
HYPOTHESIS Doxorubicin hydrochloride (DX) is widely used as a chemotherapeutic agent, though its severe side-effects limit its clinical use. A way to overcome these limitations is to increase DX latency through encapsulation in suitable carriers. However, DX has a high solubility in water, hindering encapsulation. The formulation of DX with sodium cholate (NaC) will reduce aqueous solubility through charge neutralization and hydrophobic interactions thus facilitating DX encapsulation into poloxamer (F127) micelles, increasing drug latency. EXPERIMENTS DX/NaC/PEO-PPO-PEO triblock copolymer (F127) formulations with high DX content (DX-PMs) have been prepared and characterized by scattering techniques, transmission electron microscopy and fluorescence spectroscopy. Cell proliferation has been evaluated after DX-PMs uptake in three cell lines (A549, Hela, 4T1). Cell uptake of DX has been studied by means of confocal laser scanning microscopy and flow cytometry. FINDINGS DX-PMs formulations result in small and stable pluronic micelles, with the drug located in the apolar core of the polymeric micelles. Cell proliferation assays show a delayed cell toxicity for the encapsulated DX compared with the free drug. Data show a good correlation between cytotoxic response and slow DX delivery to nuclei. DX-PMs offer the means to restrict DX delivery to the cell interior in a highly stable and biocompatible formulation, suitable for cancer therapy.
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Affiliation(s)
- Elisamaria Tasca
- Chemistry Department, University "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Patrizia Andreozzi
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014 Donostia San Sebastián, Spain; Chemistry Department "Hugo Shiff", University of Florence, Via Della, Lastruccia 13, Sesto Fiorentino 50019, Firenze, Italy
| | | | - Luciano Galantini
- Chemistry Department, University "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy; Centre for Colloid and Surface Science - C.S.G.I, Operative Unit of Bari c/o Chemistry Department, University "Aldo Moro", Bari, Italy
| | - Karin Schillén
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | | | - Maria de Los Angeles Ramirez
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014 Donostia San Sebastián, Spain
| | - Sergio Enrique Moya
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014 Donostia San Sebastián, Spain.
| | - Mauro Giustini
- Chemistry Department, University "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy; Centre for Colloid and Surface Science - C.S.G.I, Operative Unit of Bari c/o Chemistry Department, University "Aldo Moro", Bari, Italy.
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12
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El-Hady SM, AbouGhaly MH, El-Ashmoony MM, Helmy HS, El-Gazayerly ON. Colon targeting of celecoxib nanomixed micelles using pulsatile drug delivery systems for the prevention of inflammatory bowel disease. Int J Pharm 2020; 576:118982. [DOI: 10.1016/j.ijpharm.2019.118982] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 12/01/2019] [Accepted: 12/17/2019] [Indexed: 01/02/2023]
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13
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Schillén K, Galantini L, Du G, Del Giudice A, Alfredsson V, Carnerup AM, Pavel NV, Masci G, Nyström B. Block copolymers as bile salt sequestrants: intriguing structures formed in a mixture of an oppositely charged amphiphilic block copolymer and bile salt. Phys Chem Chem Phys 2019; 21:12518-12529. [PMID: 31145393 DOI: 10.1039/c9cp01744e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
To study the formation and characterize the structure of mixed complexes of oppositely charged block copolymers and surfactants are of great significance for practical applications, e.g., in drug carrier formulations that are based on electrostatically assisted assembly. In this context, biocompatible block copolymers and biosurfactants (like bile salts) are particularly interesting. In this work, we report on the co-assembly in dilute aqueous solution between a cationic poly(N-isopropyl acryl amide) (PNIPAM) diblock copolymer and the oppositely charged bile salt surfactant sodium deoxycholate at ambient temperature. The cryogenic transmission electron microscopy (cryo-TEM) experiments revealed the co-existence of two types of co-assembled complexes of radically different morphology and inner structure. They are formed mainly as a result of the electrostatic attraction between the positively charged copolymer blocks and bile salt anions and highlight the potential of using linear amphiphilic block copolymers as bile salt sequestrants in the treatment of bile acid malabsorption and hypercholesterolemia. The first complex of globular morphology has a coacervate core of deoxycholate anions and charged copolymer blocks surrounded by a PNIPAM corona. The second complex has an intriguing tape-like supramolecular morphology of several micrometer in length that is striped in the direction of the long axis. A model is presented in which the stretched cationic blocks of several block copolymers interact electrostatically with the bile salt molecules that are associated to form a zipper-like structure. The tape is covered on both sides by the PNIPAM chains that stabilize the overall complex in solution. In addition to cryo-TEM, the mixed system was investigated in a range of molar charge fractions at a constant copolymer concentration by static light scattering, small angle X-ray scattering, and electrophoretic mobility measurements.
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Affiliation(s)
- Karin Schillén
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Luciano Galantini
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Guanqun Du
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Alessandra Del Giudice
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Viveka Alfredsson
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Anna M Carnerup
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Nicolae V Pavel
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Giancarlo Masci
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern N-0315, Oslo, Norway
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14
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di Gregorio MC, Travaglini L, Del Giudice A, Cautela J, Pavel NV, Galantini L. Bile Salts: Natural Surfactants and Precursors of a Broad Family of Complex Amphiphiles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:6803-6821. [PMID: 30234994 DOI: 10.1021/acs.langmuir.8b02657] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Bile salts (BSs) are naturally occurring rigid surfactants with a steroidal skeleton and specific self-assembly and interface behaviors. Using bile salts as precursors, derivatives can be synthesized to obtain molecules with specific functionalities and amphiphilic structure. Modifications on single molecules are normally performed by substituting the least-hindered hydroxyl group on carbon C-3 of the steroidal A ring or at the end of the lateral chain. This leads to monosteroidal rigid building blocks that are often able to self-organize into 1D structures such as tubules, twisted ribbons, and fibrils with helical supramolecular packing. Tubular aggregates are of particular interest, and they are characterized by cross-section inner diameters spanning a wide range of values (3-500 nm). They can form through appealing pH- or temperature-responsive aggregation and in mixtures of bile salt derivatives to provide mixed tubules with tunable charge and size. Other derivatives can be prepared by covalently linking two or more bile salt molecules to provide complex systems such as oligomers, dendrimers, and polymeric materials. The unconventional amphiphilic molecular structure imparts specific features to BSs and derivatives that can be exploited in the formulation of capsules, drug carriers, dispersants, and templates for the synthesis of nanomaterials.
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Affiliation(s)
| | - Leana Travaglini
- CNRS, ISIS UMR 7006 , Université de Strasbourg , 8 allée Gaspard Monge , 67000 Strasbourg , France
| | - Alessandra Del Giudice
- Dipartimento di Chimica , "Sapienza" Università di Roma , P. le A. Moro 5 , 00185 Roma , Italy
| | - Jacopo Cautela
- Dipartimento di Chimica , "Sapienza" Università di Roma , P. le A. Moro 5 , 00185 Roma , Italy
| | - Nicolae Viorel Pavel
- Dipartimento di Chimica , "Sapienza" Università di Roma , P. le A. Moro 5 , 00185 Roma , Italy
| | - Luciano Galantini
- Dipartimento di Chimica , "Sapienza" Università di Roma , P. le A. Moro 5 , 00185 Roma , Italy
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Tasca E, Giudice AD, Galantini L, Schillén K, Giuliani AM, Giustini M. A fluorescence study of the loading and time stability of doxorubicin in sodium cholate/PEO-PPO-PEO triblock copolymer mixed micelles. J Colloid Interface Sci 2019; 540:593-601. [PMID: 30677613 DOI: 10.1016/j.jcis.2019.01.075] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 01/14/2019] [Accepted: 01/16/2019] [Indexed: 11/25/2022]
Abstract
HYPOTHESIS Doxorubicin hydrochloride (DX) is one of the most powerful anticancer agents though its clinical use is impaired by severe undesired side effects. DX encapsulation in nanocarrier systems has been introduced as a mean to reduce its toxicity. Micelles of the nonionic triblock copolymers of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) (PEO-PPO-PEO), are very promising carrier systems. The positive charge of DX confines the drug to the hydrophilic corona region of the micelles. The use of mixed micelles of PEO-PPO-PEO copolymers and a negatively charged bile salt should favour the solubilization of DX in the apolar core region of the micelles. EXPERIMENTS We studied the DX uptake in the micellar systems formed by sodium cholate (NaC) and the PEO100PPO65PEO100 (F127) copolymer, prepared with different mole ratios (MR = nNaC/nF127) in the range 0 ÷ 1. The systems were characterized by small angle X-ray scattering (SAXS) and dynamic light scattering (DLS); DX encapsulation was followed by steady-state and time-resolved fluorescence spectroscopy. FINDINGS The successful solubilization of DX in the host micellar systems did not affect their structure, as evidenced by both SAXS and DLS data. In the presence of NaC, DX experiences a more apolar environment as indicated by its characteristic fluorescent behaviour. The almost complete uptake of the drug occurred shortly after the sample preparation; however, time resolved fluorescence revealed a slow partition of DX between corona and core regions of the micelles. DX degradation in the mixed micellar systems was markedly reduced relative to aqueous DX solutions.
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Affiliation(s)
- Elisamaria Tasca
- Chemistry Department, University "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy
| | | | - Luciano Galantini
- Chemistry Department, University "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy; Centre for Colloid and Surface Science - C.S.G.I. Operative Unit of Bari, c/o Chemistry Department, University "Aldo Moro", Bari, Italy
| | - Karin Schillén
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | | | - Mauro Giustini
- Chemistry Department, University "La Sapienza", P.le Aldo Moro 5, 00185 Rome, Italy; Centre for Colloid and Surface Science - C.S.G.I. Operative Unit of Bari, c/o Chemistry Department, University "Aldo Moro", Bari, Italy.
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Patel V, Ray D, Bahadur A, Ma J, Aswal VK, Bahadur P. Pluronic ®-bile salt mixed micelles. Colloids Surf B Biointerfaces 2018; 166:119-126. [PMID: 29554645 DOI: 10.1016/j.colsurfb.2018.03.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 02/21/2018] [Accepted: 03/01/2018] [Indexed: 11/28/2022]
Abstract
The present study was aimed to examine the interaction of two bile salts viz. sodium cholate (NaC) and sodium deoxycholate (NaDC) with three ethylene polyoxide-polypropylene polyoxide (PEO-PPO-PEO) triblock copolymers with similar PPO but varying PEO micelles with a focus on the effect of pH on mixed micelles. Mixed micelles of moderately hydrophobic Pluronic® P123 were examined in the presence of two bile salts and compared with those from very hydrophobic L121 and very hydrophilic F127. Both the bile salts increase the cloud point (CP) of copolymer solution and decreased apparent micelle hydrodynamic diameter (Dh). SANS study revealed that P123 forms small spherical micelles showing a decrease in size on progressive addition of bile salts. The negatively charged mixed micelles contained fewer P123 molecules but progressively rich in bile salt. NaDC being more hydrophobic displays more pronounced effect than NaC. Interestingly, NaC shows micellar growth in acidic media which has been attributed to the formation of bile acids by protonation of carboxylate ion and subsequent solubilization. In contrast, NaDC showed phase separation at higher concentration. Nuclear Overhauser effect spectroscopy (NOESY) experiments provided information on interaction and location of bile salts in micelles. Results are discussed in terms of hydrophobicity of bile salts and Pluronics® and the site of bile salt in polymer micelles. Proposed molecular interactions are useful to understand more about bile salts which play important role in physiological processes.
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Affiliation(s)
- Vijay Patel
- Department of Chemistry, Jamanaben Narottambhai Motiram Patel Science College, Bharthana (Vesu), Surat, 395017, India.
| | - Debes Ray
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | - Anita Bahadur
- Department of Zoology, Sir P.T. Sarvajanik College of Science, Surat, 395001, India.
| | - Junhe Ma
- Department of Chemistry, Ashland Incorporation, Wilmington, DE 19808, USA.
| | - V K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | - Pratap Bahadur
- Department of Chemistry, Veer Narmad South Gujarat University, Surat, 395007, India.
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17
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Singla P, Singh O, Chabba S, Aswal VK, Mahajan RK. Sodium deoxycholate mediated enhanced solubilization and stability of hydrophobic drug Clozapine in pluronic micelles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 191:143-154. [PMID: 29028506 DOI: 10.1016/j.saa.2017.10.015] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 10/05/2017] [Accepted: 10/06/2017] [Indexed: 05/04/2023]
Abstract
In this report, the solubilization behaviour of a hydrophobic drug Clozapine (CLZ) in micellar suspensions of pluronics having different hydrophilic lipophilic balance (HLB) ratios viz. P84, F127 and F108 in the absence and presence of bile salt sodium deoxycholate (SDC) has been studied. UV-Vis spectroscopy has been exploited to determine the solubilization capacity of the investigated micellar systems in terms of drug loading efficiency, average number of drug molecules solubilized per micelle (ns), partition coefficient (P) and standard free energy of solubilization (∆G°). The morphological and structural changes taking place in pluronics in different concentration regimes of SDC and with the addition of drug CLZ has been explored using dynamic light scattering (DLS) and small angle neutron scattering (SANS) measurements. The SANS results revealed that aggregation behaviour of pluronic-SDC mixed micelles gets improved in the presence of drug. The micropolarity measurements have been performed to shed light on the locus of solubilization of the drug in pure and mixed micellar systems. The compatibility between CLZ and drug carriers (pluronics and SDC) was confirmed using powder X-ray diffraction (PXRD) and Fourier transform infrared spectroscopy (FTIR) techniques. Among the investigated systems, P84-SDC mixed system was found to be highly efficient for CLZ loading. The long term stability data indicated that CLZ loaded P84-SDC mixed micellar formulation remained stable for 3months at room temperature. Further, it was revealed that the CLZ loaded P84-SDC mixed micelles are converted into CLZ loaded pure P84 micelles at 30-fold dilutions which remain stable up to 48-fold dilutions. The results from the present studies suggest that P84-SDC mixed micelles can serve as suitable delivery vehicles for hydrophobic drug CLZ.
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Affiliation(s)
- Pankaj Singla
- Department of Chemistry, UGC-Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, India
| | - Onkar Singh
- Department of Chemistry, UGC-Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, India
| | - Shruti Chabba
- Department of Chemistry, UGC-Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, India
| | - V K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Rakesh Kumar Mahajan
- Department of Chemistry, UGC-Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, India.
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19
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Szymusiak M, Kalkowski J, Luo H, Donovan AJ, Zhang P, Liu C, Shang W, Irving T, Herrera-Alonso M, Liu Y. Core-shell Structure and Aggregation Number of Micelles Composed of Amphiphilic Block Copolymers and Amphiphilic Heterografted Polymer Brushes Determined by Small-Angle X-ray Scattering. ACS Macro Lett 2017; 6:1005-1012. [PMID: 29308298 DOI: 10.1021/acsmacrolett.7b00490] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A large group of functional nanomaterials employed in biomedical applications, including targeted drug delivery, relies on amphiphilic polymers to encapsulate therapeutic payloads via self-assembly processes. Knowledge of the micelle structures will provide critical insights into design of polymeric drug delivery systems. Core-shell micelles composed of linear diblock copolymers poly(ethylene glycol)-b-poly(caprolactone) (PEG-b-PCL), poly(ethylene oxide)-b-poly(lactic acid) (PEG-b-PLA), as well as a heterografted brush consisting of a poly(glycidyl methacrylate) backbone with PEG and PLA branches (PGMA-g-PEG/PLA) were characterized by dynamic light scattering (DLS) and small angle X-ray scattering (SAXS) measurements to gain structural information regarding the particle morphology, core-shell size, and aggregation number. The structural information at this quasi-equilibrium state can also be used as a reference when studying the kinetics of polymer micellization.
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Affiliation(s)
- Magdalena Szymusiak
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Joseph Kalkowski
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Hanying Luo
- Department
of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Alexander J. Donovan
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Pin Zhang
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Chang Liu
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Weifeng Shang
- Department
of Biological Sciences, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Thomas Irving
- Department
of Biological Sciences, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Margarita Herrera-Alonso
- Department
of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Ying Liu
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
- Department
of Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, Illinois 60612, United States
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Bodratti AM, Sarkar B, Alexandridis P. Adsorption of poly(ethylene oxide)-containing amphiphilic polymers on solid-liquid interfaces: Fundamentals and applications. Adv Colloid Interface Sci 2017; 244:132-163. [PMID: 28069108 DOI: 10.1016/j.cis.2016.09.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 09/23/2016] [Accepted: 09/23/2016] [Indexed: 12/30/2022]
Abstract
The adsorption of amphiphilic molecules of varying size on solid-liquid interfaces modulates the properties of colloidal systems. Nonionic, poly(ethylene oxide) (PEO)-based amphiphilic molecules are particularly useful because of their graded hydrophobic-hydrophilic nature, which allows for adsorption on a wide array of solid surfaces. Their adsorption also results in other useful properties, such as responsiveness to external stimuli and solubilization of hydrophobic compounds. This review focuses on the adsorption properties of PEO-based amphiphiles, beginning with a discussion of fundamental concepts pertaining to the adsorption of macromolecules on solid-liquid interfaces, and more specifically the adsorption of PEO homopolymers. The main portion of the review highlights studies on factors affecting the adsorption and surface self-assembly of PEO-PPO-PEO block copolymers, where PPO is poly(propylene oxide). Block copolymers of this type are commercially available and of interest in several fields, due to their low toxicity and compatibility in aqueous systems. Examples of applications relevant to the interfacial behavior of PEO-PPO-PEO block copolymers are paints and coatings, detergents, filtration, and drug delivery. The methods discussed herein for manipulating the adsorption properties of PEO-PPO-PEO are emphasized for their ability to shed light on molecular interactions at interfaces. Knowledge of these interactions guides the formulation of novel materials with useful mesoscale organization and micro- and macrophase properties.
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Bayati S, Anderberg Haglund C, Pavel NV, Galantini L, Schillén K. Interaction between bile salt sodium glycodeoxycholate and PEO–PPO–PEO triblock copolymers in aqueous solution. RSC Adv 2016. [DOI: 10.1039/c6ra12514j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Bile salts can associate to PEO–PPO–PEO block copolymer micelles and disintegrate them depending on the relative block length and molecular weight of the copolymers and bile salt/copolymer molar ratio.
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Affiliation(s)
- S. Bayati
- Division of Physical Chemistry
- Department of Chemistry
- Lund University
- SE-221 00 Lund
- Sweden
| | - C. Anderberg Haglund
- Division of Physical Chemistry
- Department of Chemistry
- Lund University
- SE-221 00 Lund
- Sweden
| | - N. V. Pavel
- Department of Chemistry
- “Sapienza” University of Rome
- 00185 Rome
- Italy
| | - L. Galantini
- Department of Chemistry
- “Sapienza” University of Rome
- 00185 Rome
- Italy
| | - K. Schillén
- Division of Physical Chemistry
- Department of Chemistry
- Lund University
- SE-221 00 Lund
- Sweden
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