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Aziz D, Mohamed S, Tayel S, Makhlouf A. Implementing polymeric pseudorotaxanes for boosting corneal permeability and antiaspergillus activity of tolnaftate: formulation development, statistical optimization, ex vivo permeation and in vivo assessment. Drug Deliv 2022; 29:2162-2176. [PMID: 35815689 PMCID: PMC9278446 DOI: 10.1080/10717544.2022.2094499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Fungal keratitis (FK) is a devastating ocular disease that can cause corneal opacity and blindness if not treated effectively. Tolnaftate (TOL) is a selective fungicidal drug against Aspergillus spp. which are among the most common causes of mycotic keratitis. TOL is lipophilic drug with low water solubility and permeation which act as obstacles for its clinical ocular efficacy. Hence, this study aimed to statistically optimize a novel polymeric pseudorotaxanes (PSRs) containing TOL for enhancing its ocular permeability and antifungal effect. For achieving this goal, a full 31.22 factorial design was fashioned for preparing and optimizing TOL-PSRs using film hydration technique. Three formulation variables were studied: drug amount (X1), weight ratio of Pluronics to HPβCD (X2) and Pluronic system (X3). Entrapment efficiency percent (EE%) (Y1), particle size (PS) (Y2) and zeta potential (ZP) (Y3) were set as dependent variables. The selected optimal TOL-PSRs (PSR1) showed EE% of 71.55 ± 2.90%, PS of 237.05 ± 12.80 nm and ZP of −32.65 ± 0.92 mV. In addition, PSR1 was compared to conventional polymeric mixed micelles (PMMs) and both carriers significantly increased the drug flux and resulted in higher amount permeated per unit area in 8 h compared to drug suspension. The histopathological studies assured the safety of PSR1 for ocular use. The in vivo susceptibility testing using Aspergillus niger confirmed that PSR1 displayed sustained antifungal activity up to 24 h. The obtained results revealed the admirable potential of PSR1 to be used as novel nanocarriers for promoting TOL ocular delivery.
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Affiliation(s)
- Diana Aziz
- Faculty of Pharmacy, Department of Pharmaceutics and Industrial Pharmacy, Cairo University, Cairo, Egypt
| | - Sally Mohamed
- Faculty of Pharmacy, Department of Microbiology and Immunology, Cairo University, Cairo, Egypt
| | - Saadia Tayel
- Faculty of Pharmacy, Department of Pharmaceutics and Industrial Pharmacy, Cairo University, Cairo, Egypt
| | - Amal Makhlouf
- Faculty of Pharmacy, Department of Pharmaceutics and Industrial Pharmacy, Cairo University, Cairo, Egypt
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Padula C, Machado IP, Vigato AA, de Araujo DR. New Strategies for Improving Budesonide Skin Retention. Pharmaceutics 2021; 14:30. [PMID: 35056927 PMCID: PMC8781796 DOI: 10.3390/pharmaceutics14010030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/16/2021] [Accepted: 12/21/2021] [Indexed: 11/30/2022] Open
Abstract
The aim of this work was to evaluate the ex vivo effect of the combination of two strategies, complexation with cyclodextrin, and poloxamer hydrogels, for improving water solubility in the dermal absorption of budesonide. Two hydrogels containing 20% poloxamer 407, alone or in combination with poloxamer 403, were prepared. Each formulation was loaded with 0.05% budesonide, using either pure budesonide or its inclusion complex with hydroxypropyl-β-cyclodextrin, and applied in finite dose conditions on porcine skin. The obtained results showed that for all formulations, budesonide accumulated preferentially in the epidermis compared to the dermis. The quantity of budesonide recovered in the receptor compartment was, in all cases, lower than the LOQ of the analytical method, suggesting the absence of possible systemic absorption. The use of a binary poloxamer mixture reduced skin retention, in line with the lower release from the vehicle. When the hydrogels were formulated with the inclusion complex, an increase in budesonide skin retention was observed with both hydrogels. Poloxamer hydrogel proved to be a suitable vehicle for cutaneous administration of budesonide.
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Affiliation(s)
- Sevgi Seçer
- Department of Biotechnology, Health Sciences Institute, Bezmialem Vakıf University, Istanbul, Turkey
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Diaz-Salmeron R, Toussaint B, Huang N, Bourgeois Ducournau E, Alviset G, Goulay Dufaÿ S, Hillaireau H, Dufaÿ Wojcicki A, Boudy V. Mucoadhesive Poloxamer-Based Hydrogels for the Release of HP-β-CD-Complexed Dexamethasone in the Treatment of Buccal Diseases. Pharmaceutics 2021; 13:117. [PMID: 33477667 DOI: 10.3390/pharmaceutics13010117] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/07/2021] [Accepted: 01/12/2021] [Indexed: 11/17/2022] Open
Abstract
Oral lichen planus (OLP) is an ongoing and chronic inflammatory disease affecting the mucous membrane of the oral cavity. Currently, the treatment of choice consists in the direct application into the buccal cavity of semisolid formulations containing a corticosteroid molecule to decrease inflammatory signs and symptoms. However, this administration route has shown various disadvantages limiting its clinical use and efficacy. Indeed, the frequency of application and the incorrect use of the preparation may lead to a poor efficacy and limit the treatment compliance. Furthermore, the saliva clearance and the mechanical stress present in the buccal cavity also involve a decrease in the mucosal exposure to the drug. In this context, the design of a new pharmaceutical formulation, containing a steroidal anti-inflammatory, mucoadhesive, sprayable and exhibiting a sustained and controlled release seems to be suitable to overcome the main limitations of the existing pharmaceutical dosage forms. The present work reports the formulation, optimization and evaluation of the mucoadhesive and release properties of a poloxamer 407 thermosensitive hydrogel containing a poorly water-soluble corticosteroid, dexamethasone acetate (DMA), threaded into hydroxypropyl-beta-cyclodextrin (HP-β-CD) molecules. Firstly, physicochemical properties were assessed to ensure suitable complexation of DMA into HP-β-CD cavities. Then, rheological properties, in the presence and absence of various mucoadhesive agents, were determined and optimized. The hydration ratio (0.218-0.191), the poloxamer 407 (15-17 wt%) percentage and liquid-cyclodextrin state were optimized as a function of the gelation transition temperature, viscoelastic behavior and dynamic flow viscosity. Deformation and resistance properties were evaluated in the presence of various mucoadhesive compounds, being the sodium alginate and xanthan gum the most suitable to improve adhesion and mucoadhesion properties. Xanthan gum was shown as the best agent prolonging the hydrogel retention time up to 45 min. Furthermore, xanthan gum has been found as a relevant polymer matrix controlling drug release by diffusion and swelling processes in order to achieve therapeutic concentration for prolonged periods of time.
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Di Donato C, Iacovino R, Isernia C, Malgieri G, Varela-Garcia A, Concheiro A, Alvarez-Lorenzo C. Polypseudorotaxanes of Pluronic® F127 with Combinations of α- and β-Cyclodextrins for Topical Formulation of Acyclovir. Nanomaterials (Basel) 2020; 10:E613. [PMID: 32230723 DOI: 10.3390/nano10040613] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/20/2020] [Accepted: 03/23/2020] [Indexed: 12/29/2022]
Abstract
Acyclovir (ACV) is one of the most used antiviral drugs for the treatment of herpes simplex virus infections and other relevant mucosal infections caused by viruses. Nevertheless, the low water solubility of ACV limits both its bioavailability and antiviral performance. The combination of block copolymer micelles and cyclodextrins (CDs) may result in polypseudorotaxanes with tunable drug solubilizing and gelling properties. However, the simultaneous addition of various CDs has barely been investigated yet. The aim of this work was to design and characterize ternary combinations of Pluronic® F127 (PF127), αCD and βCD in terms of polypseudorotaxane formation, rheological behavior, and ACV solubilization ability and controlled release. The formation of polypseudorotaxanes between PF127 and the CDs was confirmed by FT-IR spectroscopy, X-ray diffraction, and NMR spectroscopy. The effects of αCD/βCD concentration range (0–7% w/w) on copolymer (6.5% w/w) gel features were evaluated at 20 and 37 °C by rheological studies, resulting in changes of the copolymer gelling properties. PF127 with αCD/βCD improved the solubilization of ACV, maintaining the biocompatibility (hen’s egg test on the chorio-allantoic membrane). In addition, the gels were able to sustain acyclovir delivery. The formulation prepared with similar proportions of αCD and βCD provided a slower and more constant release. The results obtained suggest that the combination of Pluronic with αCD/βCD mixtures can be a valuable approach to tune the rheological features and drug release profiles from these supramolecular gels.
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Praphanwittaya P, Saokham P, Jansook P, Loftsson T. Aqueous solubility of kinase inhibitors: I the effect of hydrophilic polymers on their γ-cyclodextrin solubilization. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2019.101462] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Puig-Rigall J, Serra-Gómez R, Stead I, Grillo I, Dreiss CA, González-Gaitano G. Pseudo-Polyrotaxanes of Cyclodextrins with Direct and Reverse X-Shaped Block Copolymers: A Kinetic and Structural Study. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02509] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Joan Puig-Rigall
- Departamento de Química, Universidad de Navarra, 31080 Pamplona, Spain
| | | | - Ian Stead
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Isabelle Grillo
- Institut
Laue-Langevin, 71 avenue des Martyrs, B.P. 156, Cedex 38042 Grenoble, France
| | - Cécile A. Dreiss
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
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Sayed S, Elsayed I, Ismail MM. Optimization of β-cyclodextrin consolidated micellar dispersion for promoting the transcorneal permeation of a practically insoluble drug. Int J Pharm 2018; 549:249-260. [PMID: 30077759 DOI: 10.1016/j.ijpharm.2018.08.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 07/30/2018] [Accepted: 08/01/2018] [Indexed: 11/25/2022]
Abstract
Development of efficient ocular drug delivery system for antifungal drugs becomes a must nowadays to face and eradicate the widely spread ophthalmic fungal infections. Itraconazole, a triazole antifungal, is struggling to penetrate the cornea and subsequently, its efficacy is limited. The aim of this study was to enhance itraconazole corneal penetration through utilizing the minimum surfactant amount in presence of β-cyclodextrin which acted as a dissolution and permeation enhancer. β-Cyclodextrin consolidated micellar dispersions (CCMD) were prepared after an initial screening to select the composition of surfactant(s). The preparation was done according to a modified melt dispersion technique. The prepared CCMD were characterized through the analysis of their particle size, zeta potential and solubilization efficiency. The optimum formula was chosen based on a factorial response surface analysis and it was composed of 17:1 w/w surfactant/drug, 30:1 w/w cyclodextrin/drug ratios and 0.02% polyethylene oxide. This formula was subjected to in vitro characterization including release, imaging by transmission electron microscope, mucoadhesion, stability, in addition to the determination of the minimum inhibitory concentration. Moreover, the ex vivo/in vivo permeation, safety and efficacy profiles were determined. The optimized CCMD formula was found to be significantly safe, stable, mucoadhesive and efficient to permeate the drug through rabbits' corneas. Consequently, the optimized CCMD formulation can be a promising, safe and efficient platform for the transcorneal delivery of lipophilic drugs including most antifungals.
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Affiliation(s)
- Sinar Sayed
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Ibrahim Elsayed
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt; Department of Pharmaceutical Sciences, College of Pharmacy, Gulf Medical University, United Arab Emirates.
| | - Maha M Ismail
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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Gómez EC, Anguiano Igea S, Gómez Amoza JL, Otero Espinar FJ. Evaluation of the promoting effect of soluble cyclodextrins in drug nail penetration. Eur J Pharm Sci 2018; 117:270-8. [DOI: 10.1016/j.ejps.2018.02.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 02/22/2018] [Accepted: 02/26/2018] [Indexed: 12/17/2022]
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Papp D, Rovó P, Jákli I, Császár AG, Perczel A. Four faces of the interaction between ions and aromatic rings. J Comput Chem 2017; 38:1762-1773. [DOI: 10.1002/jcc.24816] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Revised: 04/05/2017] [Accepted: 04/06/2017] [Indexed: 02/06/2023]
Affiliation(s)
- Dóra Papp
- MTA-ELTE Complex Chemical Systems Research Group; H-1518 Budapest 112, P.O. Box 32 Hungary
- Laboratory of Molecular Structure and Dynamics; Institute of Chemistry, Eötvös Loránd University; Pázmány Péter sétány 1/A Budapest H-1117 Hungary
| | - Petra Rovó
- Department Chemie und Pharmazie; Ludwig-Maximilians-Universität München; Butenandstraße 5-11 Munich D-81377 Germany
| | - Imre Jákli
- MTA-ELTE Protein Modeling Research Group, Institute of Chemistry, Eötvös Loránd University; H-1518 Budapest 112, P.O. Box 32 Hungary
| | - Attila G. Császár
- MTA-ELTE Complex Chemical Systems Research Group; H-1518 Budapest 112, P.O. Box 32 Hungary
- Laboratory of Molecular Structure and Dynamics; Institute of Chemistry, Eötvös Loránd University; Pázmány Péter sétány 1/A Budapest H-1117 Hungary
| | - András Perczel
- MTA-ELTE Protein Modeling Research Group, Institute of Chemistry, Eötvös Loránd University; H-1518 Budapest 112, P.O. Box 32 Hungary
- Laboratory of Structural Chemistry and Biology; Institute of Chemistry, Eötvös Loránd University; Pázmány Péter sétány 1/A Budapest H-1117 Hungary
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Valerón Bergh VJ, Johannessen E, Andersen T, Tønnesen HH. Evaluation of porphyrin loaded dry alginate foams containing poloxamer 407 and β-cyclodextrin-derivatives intended for wound treatment. Pharm Dev Technol 2017; 23:761-770. [DOI: 10.1080/10837450.2017.1314492] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
| | - Elin Johannessen
- School of Pharmacy, Department of Pharmaceutics, University of Oslo, Oslo, Norway
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García-Millán E, Quintáns-Carballo M, Otero-Espinar FJ. Improved release of triamcinolone acetonide from medicated soft contact lenses loaded with drug nanosuspensions. Int J Pharm 2017; 525:226-236. [PMID: 28412447 DOI: 10.1016/j.ijpharm.2017.03.082] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 03/27/2017] [Accepted: 03/29/2017] [Indexed: 12/01/2022]
Abstract
Drug nanosuspensions (NSs) show a significant potential to improve loading and release properties of the poorly water soluble drug triamcinolone acetonide (TA) from poly(hydroxyethyl methacrylate) (pHEMA) soft contact lenses. In this work, TA NSs were developed by a controlled precipitation method using a fractional factorial Plackett-Burmann design. Poloxamer 407 (PL) and polyvinyl alcohol (PVA) as stabilizing agents were selected. NSs were characterized in terms of their drug content, particle size and morphology. Results indicate that all studied factors, except homogenization speed and sonication, have significant influence on the drug incorporation yield into NSs. Drug nanoparticles showed an interesting size that may be suitable for their incorporation into topical ocular drug delivery systems, as hydrogels. pHEMA hydrogels and daily-wear Hilafilcon B commercial contact lenses (SCLs) were employed to study TA loading capacity and drug release properties using NSs as loading system. Hydrogels have been synthesised by copolymerization of 2-hydroxyethyl methacrylate (HEMA) with methacrylic acid (MA) in accordance with a previous work (García-Millán et al., 2015). Both synthesised hydrogels and SCLs were characterized in terms of their mechanical and physical properties and TA loading and release properties. Selected TA NS was further characterized by studying its physical-chemical stability during the loading process. Results show that the use of TA NSs as loading medium significantly increases drug loading capacity and release of soft contact lenses in comparison with drug saturated solution. Synthesised pHEMA hydrogels and SCLs lenses have good properties as ophthalmic drug delivery systems, but SCLs load higher quantities of drug and release TA in shorter time periods than synthesised pHEMA hydrogel.
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Affiliation(s)
- Eva García-Millán
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, Campus Vida s/n, 15782, Santiago de Compostela, Spain
| | - Mónica Quintáns-Carballo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, Campus Vida s/n, 15782, Santiago de Compostela, Spain
| | - Francisco Javier Otero-Espinar
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, Campus Vida s/n, 15782, Santiago de Compostela, Spain; Instituto de Farmacia Industrial, Facultad de Farmacia, Universidad de Santiago de Compostela, Campus Vida s/n, 15782, Santiago de Compostela, Spain.
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Valerón Bergh VJ, Tønnesen HH. Interactions and solubilization of 5, 10, 15, 20-tetrakis(4-hydroxyphenyl)porphyrin with poloxamer 407 and β-cyclodextrin-derivatives in binary and ternary systems. J Drug Deliv Sci Technol 2017. [DOI: 10.1016/j.jddst.2016.11.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Jansook P, Pichayakorn W, Muankaew C, Loftsson T. Cyclodextrin-poloxamer aggregates as nanocarriers in eye drop formulations: dexamethasone and amphotericin B. Drug Dev Ind Pharm 2016; 42:1446-54. [PMID: 26765786 DOI: 10.3109/03639045.2016.1141932] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
In this present study cyclodextrin (CD)-poloxamer aggregates were characterized and developed as ophthalmic drug carriers. The combined effect of γCD/2-hydroxypropyl-γCD (HPγCD) mixtures and poloxamer on solubilization and permeability of two model drugs, dexamethasone (Dex) and amphotericin B (AmB), was investigated. The CD-poloxamer interaction and complex aggregation were examined by (1)H nuclear magnetic resonance ((1)H-NMR), their solubilizing ability by high-performance liquid chromatography, and their particle size determined by dynamic light scattering and transmission electron microscopy. Formulations containing either 1.5% w/v Dex or 0.15% w/v AmB in eye drop suspensions containing various γCD/HPγCD ratios and poloxamer 407 (P407) were prepared. The solubility of the drugs, surface tension and hemolytic effect of the eye drops and drug permeation from selected formulations were determined. The (1)H-NMR study showed that P407 formed inclusion complex with CDs by inserting its poly(propylene oxide) segment into the CD cavity. P407 and γCD interacted with each other to form nanosized aggregates, and the observed concentration of dissolved γCD and P407 progressively decreased with increasing γCD and P407 concentrations. Including a high proportion of HPγCD improved the drug solubilization and reduced the hemolytic effect. The surface tension of the formulations decreased with increasing P407 concentration. Furthermore, increasing P407 content in the formulations enhanced formation of complex aggregates with consequent slower drug release. It was concluded that the drug/γCD/HPγCD complex was stabilized by P407 through formation of multi-component aggregates. Thus, CD-poloxamer aggregates are self-assembled nanocarriers from which drug delivery characteristics can be adjusted by changing the γCD/HPγCD/P407 ratios.
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Affiliation(s)
- Phatsawee Jansook
- a Faculty of Pharmaceutical Sciences , Chulalongkorn University , Pathumwan, Bangkok , Thailand
| | - Wiwat Pichayakorn
- b Faculty of Pharmaceutical Sciences , Prince of Songkla University , Songkhla , Thailand
| | - Chutimon Muankaew
- c Faculty of Pharmaceutical Sciences , University of Iceland , Reykjavik , Iceland
| | - Thorsteinn Loftsson
- c Faculty of Pharmaceutical Sciences , University of Iceland , Reykjavik , Iceland
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Santos Akkari AC, Ramos Campos EV, Keppler AF, Fraceto LF, de Paula E, Tófoli GR, de Araujo DR. Budesonide-hydroxypropyl-β-cyclodextrin inclusion complex in binary poloxamer 407/403 system for ulcerative colitis treatment: A physico-chemical study from micelles to hydrogels. Colloids Surf B Biointerfaces 2016; 138:138-47. [DOI: 10.1016/j.colsurfb.2015.11.048] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 11/18/2015] [Accepted: 11/25/2015] [Indexed: 01/13/2023]
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González-Gaitano G, da Silva MA, Radulescu A, Dreiss CA. Selective tuning of the self-assembly and gelation of a hydrophilic poloxamine by cyclodextrins. Langmuir 2015; 31:5645-5655. [PMID: 25938931 DOI: 10.1021/acs.langmuir.5b01081] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Complexes formed between cyclodextrins (CDs) and polymers - pseudopolyrotaxanes (PPRs) - are the starting point of a multitude of supramolecular structures, which are proposed for a wide range of biomedical and technological applications. In this work, we investigate the complexation of a range of cyclodextrins with Tetronic T1307, a four-arm block copolymer of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) with a pH-responsive central ethylene diamine spacer, and its impact on micellization and the sol-gel transition. At low concentrations, small-angle neutron scattering (SANS) combined with dynamic light scattering (DLS) measurements show the presence of spherical micelles with a highly hydrated shell and a dehydrated core. Increasing the temperature leads to more compact micelles and larger aggregation numbers, whereas acidic conditions induce a shrinking of the micelles, with fewer unimers per micelle and a more hydrated corona. At high concentrations, T1307 undergoes a sol-gel transition, which is suppressed at pH below the pKa,1 (4.6). SANS data analysis reveals that the gels result from a random packing of the micelles, which have an increasing aggregation number and increasingly dehydrated shell and hydrated core with the temperature. Native CDs (α, β, γ-CD) can complex T1307, resulting in the precipitation of a PPR. Instead, modified CDs compete with micellization to an extent that is critically dependent on the nature of the substitution. (1)H and ROESY NMR combined with SANS demonstrate that dimethylated β-CD can thread onto the polymer, preferentially binding to the PO units, thus hindering self-aggregation by solubilizing the hydrophobic block. The various CDs are able to modulate the onset of gelation and the extent of the gel phase, and the effect correlates with the ability of the CDs to disrupt the micelles, with the exception of a sulfated sodium salt of β-CD, which, while not affecting the CMT, is able to fully suppress the gel phase.
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Affiliation(s)
| | - Marcelo A da Silva
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Aurel Radulescu
- §Jülich Center for Neutron Science, JCNS Outstation at MLZ, Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, 85747 Garching, Germany
| | - Cécile A Dreiss
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
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González-Gaitano G, Müller C, Radulescu A, Dreiss CA. Modulating the self-assembly of amphiphilic X-shaped block copolymers with cyclodextrins: structure and mechanisms. Langmuir 2015; 31:4096-4105. [PMID: 25785814 DOI: 10.1021/acs.langmuir.5b00334] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Inclusion complexes between cyclodextrins and polymers-so-called pseudopolyrotaxanes (PPR)-are at the origin of fascinating supramolecular structures, which are finding increasing uses in biomedical and technological fields. Here we explore the impact of both native and a range of modified cyclodextrins (CD) on the self-assembly of X-shaped poly(ethylene oxide)-poly(propylene oxide) block copolymers, so-called Tetronics or poloxamines, by focusing on Tetronic 904 (T904, Mw 6700). The effects are markedly dependent on the type and arrangement of the substituents on the macrocycle. While native CDs drive the formation of a solid PPR, most substituted CDs induce micellar breakup, with dimethylated β-CD (DIMEB) having the strongest impact and randomly substituted CDs a much weaker disruptive effect. Using native α-CD as a "molecular trap", we perform competitive binding experiments-where two types of CDs thread together onto the polymer chains-to establish that DIMEB indeed has the highest propensity to form an inclusion complex with the polymer, while hydroxypropylated CDs do not thread. 1D (1)H NMR and ROESY experiments confirm the formation of a soluble PPR with DIMEB in which the CD binds preferentially to the PO units, thus providing the drive for the observed demicellization. A combination of dynamic light scattering (DLS) and small-angle neutron scattering (SANS) is used to extract detailed structural parameters on the micelles. A binding model is proposed, which exploits the chemical shifts of selected protons from the CD in conjunction with the Hill equation, to prove that the formation of the PPR is a negatively cooperative process, in which threaded DIMEBs hamper the entrance of subsequent macrocycles.
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Affiliation(s)
- Gustavo González-Gaitano
- †Departamento de Química y Edafología, Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Spain
| | - Céline Müller
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Aurel Radulescu
- §Jülich Center for Neutron Science, JCNS Outstation at MLZ, Forschungszentrum Jülich GmbH, Lichtenbergstraße 1,85747 Garching, Germany
| | - Cécile A Dreiss
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
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Ji R, Cheng J, Song CC, Du FS, Liang DH, Li ZC. Acid-Sensitive Polypseudorotaxanes Based on Ortho Ester-Modified Cyclodextrin and Pluronic F-127. ACS Macro Lett 2015; 4:65-69. [PMID: 35596374 DOI: 10.1021/mz5007359] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We demonstrate a new type of acid-sensitive amphiphilic polypseudorotaxanes (PPRs) formed via inclusion complexation between Pluronic F127 and the hydrophobic β-cyclodextrin (CD) derivative in alcoholic solvents. The 6-OH ortho ester-substituted hydrophobic β-CD derivative (EMD-CD) was prepared by "click" reaction of β-CD with 2-ethylidene-4-methyl-1,3-dioxalane under mild conditions. The water-insoluble EMD-CD (host) is capable of forming PPRs with F127 (guest) in ethanol or methanol but not in water, which is confirmed by 1H NMR, wide-angle X-ray diffraction, small-angle X-ray scattering, and the time-dependent threading kinetics. Depending on the host/guest ratio, the PPRs self-assembled into sheet-like structure or vesicular nanoparticles with different sizes in water. These PPR assemblies were stable at pH 8.4 but quickly dissociated into biocompatible products in neutral or in acidic buffers due to the hydrolysis of the ortho ester groups. Good biocompatibility, ease of fabrication, and extremely pH-sensitive character make the PPRs promising carriers for anticancer drug delivery. Moreover, the present work provides an alternative method for the preparation of PPRs composed of water-insoluble CD derivatives.
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Affiliation(s)
- Ran Ji
- Beijing National Laboratory
for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics
of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Jing Cheng
- Beijing National Laboratory
for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics
of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Cheng-Cheng Song
- Beijing National Laboratory
for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics
of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Fu-Sheng Du
- Beijing National Laboratory
for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics
of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - De-Hai Liang
- Beijing National Laboratory
for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics
of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Zi-Chen Li
- Beijing National Laboratory
for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics
of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
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Abstract
Hosting of polymers, lipids and drug conjugates makes cyclodextrins suitable to prepare biocompatible, targetable and stimuli-responsive supramolecular drug nanocarriers.
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Affiliation(s)
- Susana M. N. Simões
- Faculty of Pharmacy
- University of Coimbra
- Coimbra
- Portugal
- Center for Neuroscience and Cell Biology
| | - Ana Rey-Rico
- Departamento de Farmacia y Tecnología Farmacéutica
- Facultad de Farmacia
- Universidad de Santiago de Compostela
- Santiago de Compostela
- Spain
| | - Angel Concheiro
- Departamento de Farmacia y Tecnología Farmacéutica
- Facultad de Farmacia
- Universidad de Santiago de Compostela
- Santiago de Compostela
- Spain
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacia y Tecnología Farmacéutica
- Facultad de Farmacia
- Universidad de Santiago de Compostela
- Santiago de Compostela
- Spain
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Fernández-Ferreiro A, Fernández Bargiela N, Varela MS, Martínez MG, Pardo M, Piñeiro Ces A, Méndez JB, Barcia MG, Lamas MJ, Otero-Espinar F. Cyclodextrin-polysaccharide-based, in situ-gelled system for ocular antifungal delivery. Beilstein J Org Chem 2014; 10:2903-11. [PMID: 25550757 PMCID: PMC4273241 DOI: 10.3762/bjoc.10.308] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 11/21/2014] [Indexed: 11/23/2022] Open
Abstract
Fluconazole was studied with two different hydrophilic cyclodextrins (hydroxypropyl-β-cyclodextrin (HPBCD) and sulfobutyl ether-β-cyclodextrin (SBECD)) for the formation of inclusion complexes. HPBCD and SBECD showed low cell cytotoxicity in human keratocytes as assessed by the label-free xCELLigence system for real-time monitoring. The fluconazole–HPBCD complex was incorporated into an ion-sensitive ophthalmic gel composed of the natural polysaccharides gellan gum and κ-carrageenan. This system showed good bioadhesive properties and effective control of fluconazole release.
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Affiliation(s)
- Anxo Fernández-Ferreiro
- Pharmacy and Pharmaceutical Technology Department, Faculty of Pharmacy, University of Santiago de Compostela (USC), Praza Seminario de Estudos Galegos s/n, Santiago de Compostela, 1570, Spain ; Pharmacy Department, Xerencia de Xestión Integrada de Santiago de Compostela, SERGAS, Travesía Choupana s/n, Santiago de Compostela, 15706, Spain
| | - Noelia Fernández Bargiela
- Pharmacy and Pharmaceutical Technology Department, Faculty of Pharmacy, University of Santiago de Compostela (USC), Praza Seminario de Estudos Galegos s/n, Santiago de Compostela, 1570, Spain
| | - María Santiago Varela
- Ophthalmology Department, Hospital de Conxo, Xerencia de Xestión Integrada de Santiago de Compostela, SERGAS, Rua Ramón Baltar s/n, Santiago de Compostela, 15706, Spain
| | - Maria Gil Martínez
- Ophthalmology Department, Hospital de Conxo, Xerencia de Xestión Integrada de Santiago de Compostela, SERGAS, Rua Ramón Baltar s/n, Santiago de Compostela, 15706, Spain
| | - Maria Pardo
- Grupo Obesidomica, Instituto de Investigación Sanitaria (IDIS-ISCIII), SERGAS, Travesía da Choupana s/n, Santiago de Compostela, 15706, Spain
| | - Antonio Piñeiro Ces
- Ophthalmology Department, Hospital de Conxo, Xerencia de Xestión Integrada de Santiago de Compostela, SERGAS, Rua Ramón Baltar s/n, Santiago de Compostela, 15706, Spain
| | - José Blanco Méndez
- Pharmacy and Pharmaceutical Technology Department, Faculty of Pharmacy, University of Santiago de Compostela (USC), Praza Seminario de Estudos Galegos s/n, Santiago de Compostela, 1570, Spain
| | - Miguel González Barcia
- Pharmacy Department, Xerencia de Xestión Integrada de Santiago de Compostela, SERGAS, Travesía Choupana s/n, Santiago de Compostela, 15706, Spain
| | - Maria Jesus Lamas
- Pharmacy Department, Xerencia de Xestión Integrada de Santiago de Compostela, SERGAS, Travesía Choupana s/n, Santiago de Compostela, 15706, Spain
| | - FranciscoJ Otero-Espinar
- Pharmacy and Pharmaceutical Technology Department, Faculty of Pharmacy, University of Santiago de Compostela (USC), Praza Seminario de Estudos Galegos s/n, Santiago de Compostela, 1570, Spain ; Industrial Pharmacy Institute, Faculty of Pharmacy, University of Santiago de Compostela (USC), Praza Seminario de Estudos Galegos s/n, Santiago de Compostela, 15701, Spain
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Micutz M, Matalon E, Staicu T, Angelescu D, Ariciu AM, Rogozea A, Turcu IM, Ionita G. The influence of hydroxy propyl β-cyclodextrin on the micellar to gel transition in F127 solutions investigated at macro and nanoscale levels. NEW J CHEM 2014. [DOI: 10.1039/c4nj00123k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bleta R, Machut C, Léger B, Monflier É, Ponchel A. Coassembly of Block Copolymer and Randomly Methylated β-Cyclodextrin: From Swollen Micelles to Mesoporous Alumina with Tunable Pore Size. Macromolecules 2013. [DOI: 10.1021/ma4008303] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rudina Bleta
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
| | - Cécile Machut
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
| | - Bastien Léger
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
| | - Éric Monflier
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
| | - Anne Ponchel
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
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Nogueiras-nieto L, Begoña Delgado-charro M, Otero-espinar FJ. Thermogelling hydrogels of cyclodextrin/poloxamer polypseudorotaxanes as aqueous-based nail lacquers: Application to the delivery of triamcinolone acetonide and ciclopirox olamine. Eur J Pharm Biopharm 2013; 83:370-7. [DOI: 10.1016/j.ejpb.2012.11.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Zhang J, Shen X. Temperature-Induced Reversible Transition between Vesicle and Supramolecular Hydrogel in the Aqueous Ionic Liquid−β-Cyclodextrin System. J Phys Chem B 2013; 117:1451-7. [DOI: 10.1021/jp308877w] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Jingjing Zhang
- Beijing National Laboratory for Molecular Sciences
(BNLMS), Radiochemistry and Radiation Chemistry Key Laboratory of
Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xinghai Shen
- Beijing National Laboratory for Molecular Sciences
(BNLMS), Radiochemistry and Radiation Chemistry Key Laboratory of
Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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Seoane S, Díaz-Rodríguez P, Sendon-Lago J, Gallego R, Pérez-Fernández R, Landin M. Administration of the optimized β-Lapachone-poloxamer-cyclodextrin ternary system induces apoptosis, DNA damage and reduces tumor growth in a human breast adenocarcinoma xenograft mouse model. Eur J Pharm Biopharm 2013; 84:497-504. [PMID: 23333901 DOI: 10.1016/j.ejpb.2012.12.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 12/27/2012] [Accepted: 12/29/2012] [Indexed: 11/22/2022]
Abstract
β-Lapachone (β-Lap) is a 1,2-orthonaphthoquinone that selectively induces cell death in human cancer cells through NAD(P)H:quinone oxidoreductase-1 (NQO1). NQO1 is overexpressed in a variety of tumors, as compared to normal adjacent tissue. However, the low solubility and non-specific distribution of β-Lap limit its suitability for clinical assays. We formulated β-Lap in an optimal random methylated-β-cyclodextrin/poloxamer 407 mixture (i.e., β-Lap ternary system) and, using human breast adenocarcinoma MCF-7 cells and immunodeficient mice, performed in vitro and in vivo evaluation of its anti-tumor effects on proliferation, cell cycle, apoptosis, DNA damage, and tumor growth. This ternary system is fluid at room temperature, gels over 29 °C, and provides a significant amount of drug, thus facilitating intratumoral delivery, in situ gelation, and the formation of a depot for time-release. Administration of β-Lap ternary system to MCF-7 cells induces an increase in apoptosis and DNA damage, while producing no changes in cell cycle. Moreover, in a mouse xenograft tumor model, intratumoral injection of the system significantly reduces tumor volume, while increasing apoptosis and DNA damage without visible toxicity to liver or kidney. These anti-tumoral effects and lack of visible toxicity make this system a promising new therapeutic agent for breast cancer treatment.
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Yáñez C, Cañete-Rosales P, Castillo JP, Catalán N, Undabeytia T, Morillo E. Cyclodextrin inclusion complex to improve physicochemical properties of herbicide bentazon: exploring better formulations. PLoS One 2012; 7:e41072. [PMID: 22952577 PMCID: PMC3428336 DOI: 10.1371/journal.pone.0041072] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Accepted: 06/17/2012] [Indexed: 11/24/2022] Open
Abstract
The knowledge of the host-guest complexes using cyclodextrins (CDs) has prompted an increase in the development of new formulations. The capacity of these organic host structures of including guest within their hydrophobic cavities, improves physicochemical properties of the guest. In the case of pesticides, several inclusion complexes with cyclodextrins have been reported. However, in order to explore rationally new pesticide formulations, it is essential to know the effect of cyclodextrins on the properties of guest molecules. In this study, the inclusion complexes of bentazon (Btz) with native βCD and two derivatives, 2-hydroxypropyl-β-cyclodextrin (HPCD) and sulfobutylether-β-cyclodextrin (SBECD), were prepared by two methods: kneading and freeze-drying, and their characterization was investigated with different analytical techniques including Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), X-ray diffractometry (XRD) and differential pulse voltammetry (DPV). All these approaches indicate that Btz forms inclusion complexes with CDs in solution and in solid state, with a stoichiometry of 1:1, although some of them are obtained in mixtures with free Btz. The calculated association constant of the Btz/HPCD complex by DPV was 244±19 M(-1) being an intermediate value compared with those obtained with βCD and SBECD. The use of CDs significantly increases Btz photostability, and depending on the CDs, decreases the surface tension. The results indicated that bentazon forms inclusion complexes with CDs showing improved physicochemical properties compared to free bentazon indicating that CDs may serve as excipient in herbicide formulations.
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Affiliation(s)
- Claudia Yáñez
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile.
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Díaz-rodríguez P, Landin M. Smart design of intratumoral thermosensitive β-lapachone hydrogels by Artificial Neural Networks. Int J Pharm 2012; 433:112-8. [DOI: 10.1016/j.ijpharm.2012.05.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Revised: 05/02/2012] [Accepted: 05/03/2012] [Indexed: 12/19/2022]
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Cunha-Filho MSS, Alvarez-Lorenzo C, Martínez-Pacheco R, Landin M. Temperature-sensitive gels for intratumoral delivery of β-lapachone: effect of cyclodextrins and ethanol. ScientificWorldJournal 2012; 2012:126723. [PMID: 22629119 PMCID: PMC3349311 DOI: 10.1100/2012/126723] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Accepted: 01/15/2012] [Indexed: 12/16/2022] Open
Abstract
This work evaluated the potential of Pluronics (varieties F127 and P123) in combination with solubilizing agents to be used as syringeable in situ gelling depots of intratumoral β-lapachone (βLAP). Pluronic dispersions prepared at various concentrations in the absence and the presence of ethanol and randomly methylated β-cyclodextrin (RMβCD) were characterized regarding their rheological properties, drug solubilization capacity, and in vitro release. Pluronic F127 (18-23%) formulations combined high ability to solubilize βLAP (enhancement solubility factor up to 50), adequate gel temperature range (over 25 °C), and gel strength at 37 °C enough to guarantee the permanence of the formulation in the administration site for a period of time. βLAP release rate was finely tuned by the concentration of the polymer and the addition of RMβCD (diffusion coefficient ranging between 9 and 69 μg · cm(-2)). The ethanol increases βLAP release rate but simultaneously led to weak gels. This paper shows that βLAP formulations involving temperature-reversible Pluronic gels may be suitable for intratumoral drug delivery purposes.
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Affiliation(s)
- Marcilio S S Cunha-Filho
- Faculdade de Ciências da Saúde, Universidade de Brasília, Campus Universitário Darcy Ribeiro, 70910-900 Brasília-DF, Brazil
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Valero M, Grillo I, Dreiss CA. Rupture of Pluronic Micelles by Di-Methylated β-Cyclodextrin Is Not Due to Polypseudorotaxane Formation. J Phys Chem B 2012; 116:1273-81. [DOI: 10.1021/jp210439n] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Margarita Valero
- Departamento de Química Física, Facultad de Farmacia, Universidad de Salamanca, 37008 Salamanca, Spain
| | - Isabelle Grillo
- Institut Laue-Langevin (ILL), DS/LSS, 6, rue Jules Horowitz, B.P. 156, 38042 Grenoble Cedex, France
| | - Cécile A. Dreiss
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, United Kingdom
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Simões S, Veiga F, Torres-labandeira J, Ribeiro A, Sandez-macho M, Concheiro A, Alvarez-lorenzo C. Syringeable Pluronic–α-cyclodextrin supramolecular gels for sustained delivery of vancomycin. Eur J Pharm Biopharm 2012; 80:103-12. [DOI: 10.1016/j.ejpb.2011.09.017] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 09/27/2011] [Accepted: 09/30/2011] [Indexed: 02/03/2023]
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Nogueiras-Nieto L, Sobarzo-Sánchez E, Gómez-Amoza JL, Otero-Espinar FJ. Competitive displacement of drugs from cyclodextrin inclusion complex by polypseudorotaxane formation with poloxamer: implications in drug solubilization and delivery. Eur J Pharm Biopharm 2011; 80:585-95. [PMID: 22182528 DOI: 10.1016/j.ejpb.2011.12.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 11/07/2011] [Accepted: 12/03/2011] [Indexed: 11/19/2022]
Abstract
The competitive interactions between the poly-[propylene oxide] (POO)-poly-[ethylene oxide] (PEO) block copolymer poloxamer 407 (Pluronic F127) and two drugs, triamcinolone acetonide and ciclopirox olamine, by the formation of inclusion complexes with two cyclodextrin hydrophilic derivatives, hydroxypropyl-β-cyclodextrin (HPβCD; molar substitution (MS) 0.65) and partially methylated-β-cyclodextrin (MβCD; MS 0.57), were studied by means of one-dimensional (1)H NMR, 2D ROESY experiments, solubility studies and drug release studies. 1D and 2D NMR and solubility studies indicate that both triamcinolone acetonide and ciclopirox olamine form stable inclusion complexes with the cyclodextrin derivatives. In the case of ciclopirox olamine the complex was more stable at pH 1. Effective complexation of poloxamer with the two cyclodextrins (CDs) was also evidenced by NMR analysis, and competitive displacement of the drugs from the CD cavity by the polymer was observed. Drug solubility in CD solutions was not modified by the addition of polymers, indicating that a decrease in solubility due to the competitive displacement is probably compensated by the solubilizing effect of polymer micellization. Finally, polypseudorotaxanes formation has a significant influence on the release of the drugs studied. Changes in the release rate depend on the stability of drug-CD inclusion complex and on cyclodextrin concentration in the bulk solution; so polypseudorotaxane formation can be employed to modulate drug controlled release from thermosensitive hydrogels.
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Affiliation(s)
- Luis Nogueiras-Nieto
- Departamento de Farmacia y Tecnología Farmacéutica, University of Santiago de Compostela, Santiago de Compostela, Spain
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Castiglione F, Valero M, Dreiss CA, Mele A. Selective interaction of 2,6-di-O-methyl-β-cyclodextrin and Pluronic F127 micelles leading to micellar rupture: a nuclear magnetic resonance study. J Phys Chem B 2011; 115:9005-13. [PMID: 21667967 DOI: 10.1021/jp203753r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The triblock-copolymer poly(ethylene oxide)-poly(propyleneoxide)-poly(ethylene oxide) (PEO-PPO-PEO), referred to as Pluronic, is widely studied for its unique aggregation properties and its applications in drug delivery and targeting. In previous studies [Dreiss, C. A.; et al. Soft Matter 2009, 5, 1888-1896], we showed that the interaction of heptakis (2,6-di-O-methyl)-β cyclodextrin (DIMEB) with the triblock-copolymer Pluronic F127 in solutions above the CMC led to complete disruption of the polymeric micelles, while similar β cyclodextrins (βCD) derivatives, heptakis (2,3,6-tri-O-methyl)-βCD (TRIMEB), hydroxypropyl-βCD (HPBCD), and hydroxyethyl-βCD (HEBCD), did not induce micellar break-up. In this work, nuclear magnetic resonance spectroscopy experiments were used to elucidate the nature of the interactions leading to break-up and highlight differences between the four βCD derivatives studied, which could explain the very different outcome observed. Intermolecular nuclear Overhauser enhancements (NOEs) show that both DIMEB and TRIMEB interact selectively with the PPO methyl groups of F127 in a similar way. The interaction is mainly with the external methyl groups in the 6-position of the glucopyranose units of cyclodextrins. However, a weak but detectable interaction with the inner cyclodextrins protons is also observed. These interactions, both with the external surface and with the cavity of βCD, suggest the formation of a loose complex, rather than the widely invoked pseudorotaxane type of inclusion. In addition, these interactions seem to be necessary but not sufficient to induce micellar break-up. Diffusion measurements show decreased diffusivity of DIMEB in the presence of F127 to a larger extent than the other CD derivatives, thus confirming the unique behavior of DIMEB toward F127 polymer. From the diffusion coefficients, an average of 1 DIMEB molecule per 4.2 PO groups of F127 is determined for the highest concentration of DIMEB considered (11 wt % DIMEB dissolved in 5 wt % F127). Micellar break-up is complete at a concentration as low as 1 DIMEB molecule per 8.2 PO units.
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Affiliation(s)
- Franca Castiglione
- Department of Chemistry, Materials and Chemical Engineering G. Natta, Politecnico di Milano, Piazza L. Da Vinci 32 I-20133, Milano, Italy
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