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Suárez D, Díaz N. Amphiphilic cyclodextrins: Dimerization and diazepam binding explored by molecular dynamics simulations. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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2
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Photophysical Study of Styryl Derivatives with Macrocyclic Host and the Effect of Addition of Cholesterol and Neurotransmitter. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.113842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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3
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Das A, Das S, Biswas A, Chattopadhyay N. Exploration of Self-Aggregation of Coumarin 7 and Coumarin 30 in Water: Role of β-Cyclodextrin as a Modulator. J Phys Chem B 2021; 125:13482-13493. [PMID: 34865492 DOI: 10.1021/acs.jpcb.1c07287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Steady-state and time-resolved spectroscopic studies demonstrate that two members of the coumarin class of dyes, coumarin 7 (C7) and coumarin 30 (C30), undergo self-aggregation in water. The development of hypsochromically shifted new absorption bands in addition to the existing monomer bands with an increase in concentration of the dyes in an aqueous medium suggests that the aggregates are of H-type. An absorption-based kinetic study reveals that the rate of aggregation of C30 is an order of magnitude faster than that of C7. Second-order rate kinetics, as obtained from the half-life (t1/2) data, implies that the aggregates are dimeric in nature. Observations of isosbestic points in area-normalized absorption spectra (ANAS) and isoemissive points in area-normalized fluorescence excitation spectra (ANFES) and time-resolved area-normalized emission spectra (TRANES) establish that ground-state monomer ⇌ dimer equilibria for both of the systems are preserved in the photoexcited state. The present study further establishes that β-cyclodextrin is the most efficient of the three common cyclodextrins in shifting the equilibria toward the monomer by encapsulating the monomers within its cavity, making β-CD a convenient modulator to control the self-aggregation process. Dynamic light scattering (DLS), quantum chemical calculations, and molecular docking studies provide further support to our propositions.
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Affiliation(s)
- Arindam Das
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India
| | - Sinjan Das
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India
| | - Arnab Biswas
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India
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Nita LE, Chiriac AP, Ghilan A, Rusu AG, Pamfil D, Rosca I, Mititelu-Tartau L. Alginate enriched with phytic acid for hydrogels preparation. Therapeutic applications. Int J Biol Macromol 2021; 189:335-345. [PMID: 34425119 DOI: 10.1016/j.ijbiomac.2021.08.122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 08/12/2021] [Accepted: 08/16/2021] [Indexed: 10/20/2022]
Abstract
In the last decade, numerous innovative strategies have been used to obtain highly efficient synthetic or semi-synthetic biomaterials. Between these innovative biomaterials, hydrogels occupy a distinct place due to their superior biological and physico-chemical characteristics. Alginate is a natural linear polysaccharide with important physico-chemical and biological properties. Recently, we obtained a new hydrogel based on alginate and phytic acid with improved physico-chemical properties. In the present study, the hydrogels previously obtained were tested in terms of their biological properties and possibilities of use in the biomedical field. For this purpose, the hydrogels were loaded with norfloxacin (NRF), an antibacterial compound utilised in the treatment against Gram-negative and Gram-positive organisms. Unfortunately, NRF has low solubility and permeability. In order to provide protection against loss, but also for enhanced bioavailability, and controlled-release of norfloxacin, a drug inclusion complex with cyclodextrin was realized. The effect of complexation on the release profile was highlighted. The addition of NRF to the hydrogel matrices greatly improved the antibacterial activity of the tested compounds. The presence of CD did not affect the homogeneity of the drug distribution. Changes in the polymeric matrix structure were registered after the incorporation of the drug, which were attributed to the relaxation of the network subsequently to the penetration and diffusion of the drug solution simultaneously with the swelling process. The release of NRF from Alg_PA polymeric network has been successfully modulated by the use of CD as a host molecule.
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Affiliation(s)
- Loredana Elena Nita
- Department of Natural Polymers, Bioactive and Biocompatible Materials, "Petru Poni" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41-A, RO-700487, Iasi, Romania.
| | - Aurica P Chiriac
- Department of Natural Polymers, Bioactive and Biocompatible Materials, "Petru Poni" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41-A, RO-700487, Iasi, Romania
| | - Alina Ghilan
- Department of Natural Polymers, Bioactive and Biocompatible Materials, "Petru Poni" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41-A, RO-700487, Iasi, Romania
| | - Alina Gabriela Rusu
- Department of Natural Polymers, Bioactive and Biocompatible Materials, "Petru Poni" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41-A, RO-700487, Iasi, Romania
| | - Daniela Pamfil
- Department of Physical Chemistry of Polymers, "Petru Poni" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41-A, RO-700487, Iasi, Romania
| | - Irina Rosca
- Center of Advanced Research in Bionanoconjugates and Biopolymers, "Petru Poni" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41-A, RO-700487, Iasi, Romania
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5
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Das S, Nath S, Singh TS, Chattopadhyay N. Cavity size dependent stoichiometry of probe–cyclodextrin complexation: Experimental and molecular docking demonstration. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112158] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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6
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Kumari S, Halder S, Aggrawal R, Sundar G, Saha SK. Effect of gemini surfactants on binding interactions of Coumarin 485 with calf thymus deoxyribonucleic acid in presence of nanotubes of β-cyclodextrin. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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Omrani Z, Dadkhah Tehrani A. New cyclodextrin-based supramolecular nanocapsule for codelivery of curcumin and gallic acid. Polym Bull (Berl) 2019. [DOI: 10.1007/s00289-019-02845-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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8
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Gim S, Zhu Y, Seeberger PH, Delbianco M. Carbohydrate-based nanomaterials for biomedical applications. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2019; 11:e1558. [PMID: 31063240 DOI: 10.1002/wnan.1558] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 03/21/2019] [Accepted: 03/26/2019] [Indexed: 01/09/2023]
Abstract
Carbohydrates are abundant biomolecules, with a strong tendency to form supramolecular networks. A host of carbohydrate-based nanomaterials have been exploited for biomedical applications. These structures are based on simple mono- or disaccharides, as well as on complex, polymeric systems. Chemical modifications serve to tune the shapes and properties of these materials. In particular, carbohydrate-based nanoparticles and nanogels were used for drug delivery, imaging, and tissue engineering applications. Due to the reversible nature of the assembly, often based on a combination of hydrogen bonding and hydrophobic interactions, carbohydrate-based materials are valuable substrates for the creations of responsive systems. Herein, we review the current research on carbohydrate-based nanomaterials, with a particular focus on carbohydrate assembly. We will discuss how these systems are formed and how their properties are tuned. Particular emphasis will be placed on the use of carbohydrates for biomedical applications. This article is categorized under: Nanotechnology Approaches to Biology > Nanoscale Systems in Biology.
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Affiliation(s)
- Soeun Gim
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany.,Department of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Yuntao Zhu
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Peter H Seeberger
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany.,Department of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Martina Delbianco
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
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9
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Kumari S, Sundar G, Saha SK. Binding Interaction of Gemini Surfactants with Nanotubes ofβ‐Cyclodextrin and Controlled Release of Guest Molecules: Effect of Spacer Chain Length and Concentration of Surfactants. ChemistrySelect 2019. [DOI: 10.1002/slct.201803998] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Sunita Kumari
- Department of ChemistryBirla Institute of Technology & Science (BITS) PilaniPilani Campus, Pilani Rajasthan 333031 India
| | - Ganapathisubramanian Sundar
- Department of ChemistryBirla Institute of Technology & Science (BITS) PilaniHyderabad Campus, Jawahar Nagar Telangana 500078 India
| | - Subit K. Saha
- Department of ChemistryBirla Institute of Technology & Science (BITS) PilaniPilani Campus, Pilani Rajasthan 333031 India
- Department of ChemistryBirla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Telangana 500078 India
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Rodrigues Sá Couto A, Ryzhakov A, Larsen KL, Loftsson T. Interaction of Native Cyclodextrins and Their Hydroxypropylated Derivatives with Carbamazepine in Aqueous Solution. Evaluation of Inclusion Complexes and Aggregates Formation. ACS OMEGA 2019; 4:1460-1469. [PMID: 31459413 PMCID: PMC6648831 DOI: 10.1021/acsomega.8b02045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 12/13/2018] [Indexed: 05/03/2023]
Abstract
A detailed comprehensive study on how the formation of soluble and insoluble carbamazepine/cyclodextrins (CBZ/CD) complexes (with consequent changes in the solid-phase composition) depends on the CD structure is not yet available. Moreover, the study of possible influence of this drug on the tendency of CDs and their complexes to self-aggregate is still lacking. Phase-solubility studies demonstrated that CDs and CBZ form a range of soluble (AL-type: αCD, βCD, and hydroxypropylated CDs) and insoluble (BS-type: γCD) complexes depending on CD used. HPβCD proved to be the best CD solubilizer for CBZ forming the most stable complex with highest apparent solubility, whereas γCD was shown to be the best native CD. For the native CDs, CBZ solubilization increases with increasing CD cavity diameter (αCD ≪ βCD < γCD). Solid phases collected from phase-solubility studies were characterized by Fourier-transformed infrared spectroscopy, differential scanning calorimetry, and X-ray powder diffraction to elucidate their composition and crystalline structure. They provided similar conclusions being overall supportive of phase-solubility, osmolality, and permeation studies results. Solid CBZ was the only detected component for AL-type profiles over the CD concentration range studied, whereas precipitation of poorly soluble CBZ/γCD complexes (BS-type) was observed (i.e., at and beyond plateau region). Osmometry and permeation studies were applied to evaluate the effect of CBZ on the aggregate formation and also to elucidate their influence on CD complex solubility and permeation profile. Permeation method was shown to be the most effective method to detect and evaluate aggregate formation in aqueous γCD and HPβCD solutions containing CBZ. CBZ did not affect the HPβCD tendency to self-aggregate but CBZ did modify the aggregation behavior of γCD decreasing the apparent critical aggregation concentration value from 4.2% (w/v) (in pure aqueous γCD solution) to 2.5% (w/v) (when CBZ was present).
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Affiliation(s)
- André Rodrigues Sá Couto
- Faculty
of Pharmaceutical Sciences, University of
Iceland, Hofsvallagata
53, IS-107 Reykjavik, Iceland
| | - Alexey Ryzhakov
- Faculty
of Pharmaceutical Sciences, University of
Iceland, Hofsvallagata
53, IS-107 Reykjavik, Iceland
| | - Kim Lambertsen Larsen
- Department
of Chemistry and Bioscience, Aalborg University, Frederik Bajers Vej 7H, DK-9220 Aalborg, Denmark
| | - Thorsteinn Loftsson
- Faculty
of Pharmaceutical Sciences, University of
Iceland, Hofsvallagata
53, IS-107 Reykjavik, Iceland
- E-mail: (T.L.)
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Ray A, Das S, Chattopadhyay N. Aggregation of Nile Red in Water: Prevention through Encapsulation in β-Cyclodextrin. ACS OMEGA 2019; 4:15-24. [PMID: 31459307 PMCID: PMC6649296 DOI: 10.1021/acsomega.8b02503] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 11/15/2018] [Indexed: 05/28/2023]
Abstract
The present work, based on various spectroscopic investigations, vividly demonstrates the self-association of Nile red (NR) in aqueous medium. The rapid decrease in the absorbance as well as emission of NR in water bears the signature of the aggregation process. Appearance of a new blue-shifted absorption band in addition to the original one and a drastic decrease in the emission intensity imply that the aggregation is of H-type. Poor solubility of NR in water, hydrophobic interaction, and the planar structure of the dye are ascribed to favor the formation of the aggregate in the aqueous medium. Absorption-based kinetic studies reveal the aggregation process to be second order, thereby establishing the aggregate to be a dimer. Similar kinetic profiles of the absorbance of NR in the presence and absence of light confirm that the aggregation process is not photoassisted. The presence of an isosbestic point in the absorbance spectra and an isoemissive point in the time-resolved area normalized emission spectra bears the evidence of equilibrium between the dimeric and the monomeric species of NR in the ground state as well as in the photoexcited state. Encapsulation of the monomer of NR within the hydrophobic cavity of β-cyclodextrin is demonstrated to prevent the aggregation process.
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Couto ARS, Aguiar S, Ryzhakov A, Larsen KL, Loftsson T. Interaction of native cyclodextrins and their hydroxypropylated derivatives with parabens in aqueous solutions. Part 1: evaluation of inclusion complexes. J INCL PHENOM MACRO 2019. [DOI: 10.1007/s10847-018-00876-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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13
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Rodrigues LNC, Tavares ACM, Ferreira BT, Reis AKCA, Katiki LM. Inclusion complexes and self-assembled cyclodextrin aggregates for increasing the solubility of benzimidazoles. BRAZ J PHARM SCI 2019. [DOI: 10.1590/s2175-97902019000117776] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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14
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Investigation of molecular aggregation mechanism of glipizide/cyclodextrin complexation by combined experimental and molecular modeling approaches. Asian J Pharm Sci 2018; 14:609-620. [PMID: 32104487 PMCID: PMC7032256 DOI: 10.1016/j.ajps.2018.10.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 10/03/2018] [Accepted: 10/18/2018] [Indexed: 02/01/2023] Open
Abstract
Cyclodextrin complexation is a wise strategy to enhance aqueous solubility of water-insoluble drugs. However, the aggregation mechanism of drug-cyclodextrin complexes is still unclear. This research aimed to investigate the molecular aggregation mechanism of glipizide/cyclodextrin complexation by the combination of experimental and modeling methods. Binding free energies between glipizide and cyclodextrins from modeling calculations were higher than those by the phase solubility diagram method. Both experimental and modeling results showed that methylated-β-cyclodextrin exhibited the best solubilizing capability to glipizide. Size-measurement results confirmed the aggregation between glipizide and all four cyclodextrins in high concentrations. Glipizide/γ-cyclodextrin and glipizide/β-cyclodextrin complexes showed stronger aggregation trend than HP-β-cyclodextrin and methylated-β-cyclodextrin. The substituted groups in the rim of HP-β-cyclodextrin and methylated-β-cyclodextrin lead to weak aggregation. This research provided us a clear molecular mechanism of glipizide/cyclodextrin complexation and aggregation. This research will also benefit the formulation development of cyclodextrin solubilization.
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Self-Assembly of α-Cyclodextrin and β-Cyclodextrin: Identification and Development of Analytical Techniques. J Pharm Sci 2018; 107:2208-2215. [DOI: 10.1016/j.xphs.2018.03.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 03/23/2018] [Accepted: 03/30/2018] [Indexed: 12/17/2022]
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17
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Corrigendum to “Preparation of active polysaccharide-loaded maltodextrin nanoparticles and their stability as a function of ionic strength and pH”. Lebensm Wiss Technol 2018. [DOI: 10.1016/j.lwt.2017.10.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Jansook P, Ogawa N, Loftsson T. Cyclodextrins: structure, physicochemical properties and pharmaceutical applications. Int J Pharm 2017; 535:272-284. [PMID: 29138045 DOI: 10.1016/j.ijpharm.2017.11.018] [Citation(s) in RCA: 446] [Impact Index Per Article: 63.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 11/07/2017] [Accepted: 11/08/2017] [Indexed: 01/20/2023]
Abstract
Since their discovery over 100 years ago cyclodextrins (CDs) have been the subject of numerous scientific publications. In 2016 alone CDs were the subject of over 2200 research articles published in peer-reviewed journals and mentioned in over 2300 patents and patent applications, many of which were on pharmaceutical applications. Natural CDs and their derivatives are used as enabling pharmaceutical excipients that enhance aqueous solubility of poorly soluble drugs, increase drug permeability through biological membranes and improve drug bioavailability. Unlike conventional penetration enhancers, their hydrophilic structure and high molecular weight prevents them from penetrate into lipophilic membranes leaving biological membranes intact. The natural CDs and some of their derivatives have monographs in pharmacopeias and are also commonly used as food additives and in toiletry products. CDs form inclusion complexes with lipophilic moieties of hydrophobic drugs. Furthermore, CDs are able to form non-inclusion complexes and self-assembled aggregates; small and large complex aggregates with micellar-like structures that can enhance drug solubility. Excipients commonly used in pharmaceutical formulations may have additive or inhibiting effect on the CD solubilization. Here various methods used to investigate CD aggregate formation are reviewed as well as techniques that are used to increase the solubilizing effects of CDs; methods that enhance the apparent intrinsic solubility of drugs and/or the complexation efficacy and decrease the amount of CD needed to develop CD-containing pharmaceutical formulations. It will be explained how too much or too little CD can hamper drug bioavailability, and the role of CDs in solid dosage forms and parenteral formulations, and examples given on how CDs can enhance drug delivery after ocular, nasal and pulmonary administration.
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Affiliation(s)
- Phatsawee Jansook
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmaceutical Sciences, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
| | - Noriko Ogawa
- Department of Pharmaceutical Engineering, School of Pharmacy, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya, Aichi 464-8650, Japan
| | - Thorsteinn Loftsson
- Faculty of Pharmaceutical Sciences, University of Iceland, Hofsvallagata 53, IS-107 Reykjavik, Iceland.
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Kashapov RR, Mamedov VA, Zhukova NA, Kadirov MK, Nizameev IR, Zakharova LY, Sinyashin OG. Controlling the binding of hydrophobic drugs with supramolecular assemblies of β-cyclodextrin. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.05.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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20
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Das S, Chattopadhyay N. Supramolecular Inclusion-Assisted Disruption of Probe-Solvent Network. ChemistrySelect 2017. [DOI: 10.1002/slct.201701401] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Sinjan Das
- Department of Chemistry; Jadavpur University; Kolkata - 700032 India
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Saokham P, Loftsson T. γ-Cyclodextrin. Int J Pharm 2016; 516:278-292. [PMID: 27989822 DOI: 10.1016/j.ijpharm.2016.10.062] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 10/24/2016] [Accepted: 10/26/2016] [Indexed: 12/26/2022]
Abstract
γ-Cyclodextrin (γCD) is a cyclic oligosaccharide formed by bacterial digestion of starch and used as solubilizing agent and stabilizer in a variety of pharmaceutical and food products. γCD is a large (molecular weight 1297Da) hydrophilic molecule that does not readily permeate biological membranes and is rapidly digested by bacteria in the gastrointestinal tract. In humans γCD is metabolized by α-amylase that is found in, for example, saliva, bile fluid and tears. Thus, bioavailability of γCD is negligible. Also, γCD is readily excreted unchanged in the urine after parenteral administration. Like other cyclodextrins, γCD can form water-soluble inclusion complexes with many poorly-soluble compounds. In comparison with the natural αCD and βCD, γCD has the largest hydrophobic cavity, highest water solubility and the most favorable toxicological profile. The focus of this review is production, physiochemical properties, pharmacokinetics, toxicity and applications of γCD and its derivatives. Also, the aggregation behavior of γCD in aqueous media is discussed.
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Affiliation(s)
- Phennapha Saokham
- Faculty of Pharmaceutical Sciences, University of Iceland, Hofsvallagata 53, IS-107 Reykjavik, Iceland
| | - Thorsteinn Loftsson
- Faculty of Pharmaceutical Sciences, University of Iceland, Hofsvallagata 53, IS-107 Reykjavik, Iceland.
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22
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Ryzhakov A, Do Thi T, Stappaerts J, Bertoletti L, Kimpe K, Sá Couto AR, Saokham P, Van den Mooter G, Augustijns P, Somsen GW, Kurkov S, Inghelbrecht S, Arien A, Jimidar MI, Schrijnemakers K, Loftsson T. Self-Assembly of Cyclodextrins and Their Complexes in Aqueous Solutions. J Pharm Sci 2016; 105:2556-2569. [DOI: 10.1016/j.xphs.2016.01.019] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 01/19/2016] [Accepted: 01/21/2016] [Indexed: 12/12/2022]
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Pescina S, Carra F, Padula C, Santi P, Nicoli S. Effect of pH and penetration enhancers on cysteamine stability and trans-corneal transport. Eur J Pharm Biopharm 2016; 107:171-9. [PMID: 27395395 DOI: 10.1016/j.ejpb.2016.07.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 07/04/2016] [Accepted: 07/05/2016] [Indexed: 10/21/2022]
Abstract
Ocular cystinosis is a rare metabolic disorder characterized by the presence of insoluble cystine crystals inside the corneal stroma, with consequent photophobia, keratopathies and frequent corneal erosions. The current therapy consists in the lifetime ophthalmic administration of cysteamine, drug characterized by extremely high hydrophilicity, low molecular weight (77g/mol), and easy oxidization to disulfide. Ocular delivery of cysteamine is very challenging, for its poor permeability and stability in solution. The purpose of the present paper was to study the impact of formulation pH and composition on (1) the trans-corneal delivery and (2) the stability in solution of cysteamine, with particular focus on the use of alpha-cyclodextrin (α-CD), benzalkonium chloride (BAC) and disodium edetate (EDTA). Permeation experiments were performed ex vivo through freshly excised porcine cornea; stability was evaluated for six months at -20°, +4° and +25°C; irritation potential was evaluated using HET-CAM assay. The results showed that cysteamine trans-corneal diffusion is strictly dependent on both pH (7.4 preferred to 4.2) and buffering capacity, that negatively impact on the permeation; EDTA did not enhance the trans-corneal diffusion of cysteamine neither at pH 7.4 nor at pH 4.2, while benzalkonium chloride (BAC), antimicrobial agent present within commercial eye-drops, significantly enhanced it. Notably, α-CD was able to promote the trans-corneal diffusion of cysteamine and, at a 5.5%, a 4-fold higher penetration compared to the BAC-containing formulation was obtained. EDTA and acidic pH demonstrated to be essential for cysteamine stability. The formulation obtained by combining α-CD and EDTA was characterized by significant permeation, good stability profile, and no irritation potential, even if the tolerability should be further confirmed by in vivo test.
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Affiliation(s)
| | | | | | | | - Sara Nicoli
- Department of Pharmacy, University of Parma, Italy.
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24
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Junquera E, Aicart E. Recent progress in gene therapy to deliver nucleic acids with multivalent cationic vectors. Adv Colloid Interface Sci 2016; 233:161-175. [PMID: 26265376 DOI: 10.1016/j.cis.2015.07.003] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 07/10/2015] [Accepted: 07/12/2015] [Indexed: 12/16/2022]
Abstract
Due to the potential use as transfecting agents of nucleic acids (DNA or RNA), multivalent cationic non-viral vectors have received special attention in the last decade. Much effort has been addressed to synthesize more efficient and biocompatible gene vectors able to transport nucleic acids into the cells without provoking an immune response. Among them, the mostly explored to compact and transfect nucleic acids are: (a) gemini and multivalent cationic lipids, mixed with a helper lipid, by forming lipoplexes; and (b) cationic polymers, polycations, and polyrotaxanes, by forming polyplexes. This review is focused on the progress and recent advances experimented in this area, mainly during the present decade, devoting special attention to the lipoplexes and polyplexes, as follows: (a) to its biophysical characterization (mainly electrostatics, structure, size and morphology) using a wide variety of experimental methods; and (b) to its biological activity (transfection efficacy and cytotoxicity) addressed to confirm the optimum formulations and viability of these complexes as very promising gene vectors of nucleic acids in nanomedicine.
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Affiliation(s)
- Elena Junquera
- Grupo de Química Coloidal y Supramolecular, Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
| | - Emilio Aicart
- Grupo de Química Coloidal y Supramolecular, Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain.
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25
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26
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Characterization and biological activities of cyclic (1 → 3, 1 → 6)-β-glucans from Bradyrhizobium japonicum. Biotechnol Lett 2016; 38:1519-25. [DOI: 10.1007/s10529-016-2122-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Accepted: 05/04/2016] [Indexed: 01/30/2023]
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27
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The self-assemble of natural cyclodextrins in aqueous solutions: Application of miniature permeation studies for critical aggregation concentration (cac) determinations. Int J Pharm 2016; 505:187-93. [DOI: 10.1016/j.ijpharm.2016.03.049] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 03/23/2016] [Accepted: 03/24/2016] [Indexed: 11/18/2022]
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28
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Saokham P, Loftsson T. A New Approach for Quantitative Determination of γ-Cyclodextrin in Aqueous Solutions: Application in Aggregate Determinations and Solubility in Hydrocortisone/γ-Cyclodextrin Inclusion Complex. J Pharm Sci 2015; 104:3925-3933. [PMID: 26249751 DOI: 10.1002/jps.24608] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Revised: 06/17/2015] [Accepted: 07/07/2015] [Indexed: 11/10/2022]
Abstract
Fast and simple high-pressure liquid chromatographic (HPLC) method with charged aerosol detector (CAD) was developed for quantitation of γ-cyclodextrin (γCD) in aqueous solutions. The chromatographic system consisted of a C18 column (i.e., the stationary phase) and an aqueous mobile phase containing 7% (v/v) methanol. Calibration curve was obtained over the γCD concentration range of 0.005%-1% (w/v). The limit of detection and quantitation of γCD were 0.0001% and 0.0002% (w/v), respectively. Formation of γCD aggregates in aqueous solution and their critical aggregation concentration (cac) were determined by both conventional dynamic light scattering method and permeation method using HPLC-CAD for quantitative determination of γCD. The cac of γCD was determined to be 0.95% (w/v) and the amount of γCD self-aggregates increased with increasing γCD concentrations. Also, the developed HPLC-CAD method was used to determine the γCD phase-solubility profile in an aqueous hydrocortisone (HC)/γCD complexation medium. The maximum concentration of dissolved γCD and HC was determined to be 1.47% and 0.31% (w/v), respectively. The membrane permeation method was shown to be a reliable method for determination of metastable γCD aggregates. The HPLC-CAD method was successfully applied for quantitative determination of γCD in aqueous solutions during permeation and phase-solubility studies.
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Affiliation(s)
- Phennapha Saokham
- Faculty of Pharmaceutical Sciences, University of Iceland Reykjavík Iceland
| | - Thorsteinn Loftsson
- Faculty of Pharmaceutical Sciences, University of Iceland Reykjavík Iceland.
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Valente AJM, Carvalho RA, Söderman O. Do Cyclodextrins Aggregate in Water? Insights from NMR Experiments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6314-6320. [PMID: 26017565 DOI: 10.1021/acs.langmuir.5b01493] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
One decade ago Bonini et al. [Langmuir 2006, 22, 1478-1484] reported the occurrence of aggregates of β-cyclodextrin in aqueous solutions with sizes in the range from 90 nm to a few micrometers. The experimental technique used was cryo-TEM. This work followed a number of previous studies involving other physical parameters, such as viscosities and activity coefficients, the results of which were interpreted in terms of self-aggregation of cyclodextrins. Since then, the ability of cyclodextrins to self-assemble were often used to explain and rationalize the supramolecular mechanisms involving cyclodextrins. Here, the question of aggregation of native cyclodextrins (α-, β-, and γ-) in aqueous solutions is addressed by using (1)H NMR techniques, including NMR diffusometry, relaxometry, and proton peak intensities. Within the detection limit of the NMR experiments, no aggregates of cyclodextrin were observed. If aggregates are present, the fraction of cyclodextrin in aggregates is quite small-less than 1%. However, we cannot exclude the presence of transient clusters involving several cyclodextrin molecules where the lifetime of the cluster is short.
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Affiliation(s)
| | | | - Olle Söderman
- §Division of Physical Chemistry, Department of Chemistry, Lund University, PO Box 124, S-221 00 Lund, Sweden
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30
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Effect of γ-cyclodextrin on solubilization and complexation of irbesartan: Influence of pH and excipients. Int J Pharm 2014; 474:80-90. [DOI: 10.1016/j.ijpharm.2014.08.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 08/07/2014] [Accepted: 08/09/2014] [Indexed: 11/19/2022]
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31
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Li S, Xiao M, Zheng A, Xiao H. Synthesis and characterization of a novel water-soluble cationic diblock copolymer with star conformation by ATRP. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 43:350-8. [DOI: 10.1016/j.msec.2014.06.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 04/14/2014] [Accepted: 06/30/2014] [Indexed: 11/29/2022]
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32
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Rajendiran N, Sankaranarayanan R. Azo dye/cyclodextrin: New findings of identical nanorods through 2:2 inclusion complexes. Carbohydr Polym 2014; 106:422-31. [DOI: 10.1016/j.carbpol.2014.01.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 01/05/2014] [Accepted: 01/08/2014] [Indexed: 12/23/2022]
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33
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Valente AJM, Söderman O. The formation of host-guest complexes between surfactants and cyclodextrins. Adv Colloid Interface Sci 2014; 205:156-76. [PMID: 24011696 DOI: 10.1016/j.cis.2013.08.001] [Citation(s) in RCA: 133] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 08/01/2013] [Accepted: 08/01/2013] [Indexed: 11/15/2022]
Abstract
Cyclodextrins are able to act as host molecules in supramolecular chemistry with applications ranging from pharmaceutics to detergency. Among guest molecules surfactants play an important role with both fundamental and practical applications. The formation of cyclodextrin/surfactant host-guest compounds leads to an increase in the critical micelle concentration and in the solubility of surfactants. The possibility of changing the balance between several intermolecular forces, and thus allowing the study of, e.g., dehydration and steric hindrance effects upon association, makes surfactants ideal guest molecules for fundamental studies. Therefore, these systems allow for obtaining a deep insight into the host-guest association mechanism. In this paper, we review the influence on the thermodynamic properties of CD-surfactant association by highlighting the effect of different surfactant architectures (single tail, double-tailed, gemini and bolaform), with special emphasis on cationic surfactants. This is complemented with an assessment of the most common analytical techniques used to follow the association process. The applied methods for computation of the association stoichiometry and stability constants are also reviewed and discussed; this is an important point since there are significant discrepancies and scattered data for similar systems in the literature. In general, the surfactant-cyclodextrin association is treated without reference to the kinetics of the process. However, there are several examples where the kinetics of the process can be investigated, in particular those where volumes of the CD cavity and surfactant (either the tail or in special cases the head group) are similar in magnitude. This will also be critically reviewed.
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Affiliation(s)
- Artur J M Valente
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Olle Söderman
- Division of Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, Lund, Sweden
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Formation of extended probe–cyclodextrin nanotubular supra structures: Endogenous surfactants triggered on-demand release. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.06.057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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36
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Siripornnoppakhun W, Niamnont N, Krumsri A, Tumcharern G, Vilaivan T, Rashatasakhon P, Thayumanavan S, Sukwattanasinitt M. Inclusion Complexes between Amphiphilic Phenyleneethynylene Fluorophores and Cyclodextrins in Aqueous Media. J Phys Chem B 2012; 116:12268-74. [DOI: 10.1021/jp3057652] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
| | - Nakorn Niamnont
- Department
of Chemistry, Faculty
of Science, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
| | - Akachai Krumsri
- Department of Chemistry, Faculty
of Science, Chulalongkorn University, Bangkok
10330, Thailand
| | - Gamolwan Tumcharern
- Thailand National Nanotechnology
Center, National Science and Technology Development Agency, Patumthanee 12120, Thailand
| | - Tirayut Vilaivan
- Department of Chemistry, Faculty
of Science, Chulalongkorn University, Bangkok
10330, Thailand
| | - Paitoon Rashatasakhon
- Department of Chemistry, Faculty
of Science, Chulalongkorn University, Bangkok
10330, Thailand
| | - S. Thayumanavan
- Department of Chemistry, University of Massachusetts at Amherst, Amherst, Massachusetts
01003, United States
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37
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Kurkov SV, Loftsson T. Cyclodextrins. Int J Pharm 2012; 453:167-80. [PMID: 22771733 DOI: 10.1016/j.ijpharm.2012.06.055] [Citation(s) in RCA: 544] [Impact Index Per Article: 45.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 06/25/2012] [Accepted: 06/26/2012] [Indexed: 01/24/2023]
Abstract
Although cyclodextrins (CDs) have been studied for over 100 years and can be found in at least 35 pharmaceutical products, they are still regarded as novel pharmaceutical excipients. CDs are oligosaccharides that possess biological properties that are similar to their linear counterparts, but some of their physicochemical properties differ. CDs are able to form water-soluble inclusion complexes with many poorly soluble lipophilic drugs. Thus, CDs are used to enhance the aqueous solubility of drugs and to improve drug bioavailability after, for example, oral administration. Through CD complexation, poorly soluble drugs can be formulated as aqueous parenteral solutions, nasal sprays and eye drop solutions. These oligosaccharides are being recognized as non-toxic and pharmacologically inactive excipients for both drug and food products. Recently, it has been observed that CDs and CD complexes in particular self-assemble to form nanoparticles and that, under certain conditions, these nanoparticles can self-assemble to form microparticles. These properties have changed the way we perform CD research and have given rise to new CD formulation opportunities. Here, the pharmaceutical applications of CDs are reviewed with an emphasis on their solubilizing properties, their tendency to self-assemble to form aggregates, CD ternary complexes, and their metabolism and pharmacokinetics.
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Affiliation(s)
- Sergey V Kurkov
- Faculty of Pharmaceutical Sciences, University of Iceland, Hofsvallagata 53, IS-107 Reykjavik, Iceland
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38
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Purkayastha P, Jaffer SS, Ghosh P. Physicochemical perspective of cyclodextrin nano and microaggregates. Phys Chem Chem Phys 2012; 14:5339-48. [PMID: 22428167 DOI: 10.1039/c2cp24052a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
''Chemistry beyond the molecule'' is the nickname for supramolecular chemistry. This branch of study is based on molecular recognition that is host-guest chemistry. A number of potential hosts have been defined and applied in scores of studies. Among all potential hosts, cyclodextrins occupy a high position due to their characteristic solubilisation capability and biocompatibility. In the present article we are revisiting the host-guest aspects of cyclodextrins from a physicochemical perspective. We present details of formation and applications of cyclodextrin nanoaggregates induced by guest molecules, the concerned thermodynamics behind the process and also the effect of concentration of the guest molecules on the morphology of the aggregates. This article reviews the topic mainly from the spectroscopic point of view.
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Affiliation(s)
- Pradipta Purkayastha
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741252, WB, India.
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Loftsson T, Brewster ME. Cyclodextrins as functional excipients: methods to enhance complexation efficiency. J Pharm Sci 2012; 101:3019-32. [PMID: 22334484 DOI: 10.1002/jps.23077] [Citation(s) in RCA: 314] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 01/16/2012] [Accepted: 01/18/2012] [Indexed: 12/19/2022]
Abstract
Cyclodextrins have gained currency as useful solubilizing excipients with an ever increasing list of beneficial properties and functionalities. Although their use in liquid dosage forms including oral and parenteral solutions is straightforward, their application to solids can be confounded by the added bulk that is contributed to the formulation. This factor has limited the use of cyclodextrin in tablets and relates systems mainly to potent drug substances. Increasing the ability of cyclodextrins to complex with drug through a manipulation of their complexation efficiency (CE) may expand the use of these materials to the increasing list of drug candidates and marketed drugs who may benefit from this technology. This brief review assesses tools and materials that have been suggested for increasing the CE for pharmaceutically useful cyclodextrins and drugs. The relative importance of impacting the drug solubility (S(0) ) and phase-solubility isotherm slope is discussed in the context of drug ionization and salt use; the impact of polymers, charge interactions, and charge shielding; and the coincidental formation of other complex types in the media. The influence of drug form as well as supersaturation is also discussed in the context of the responsible mechanisms along with aggregation, inclusion, and noninclusion complex formation.
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Affiliation(s)
- Thorsteinn Loftsson
- Faculty of Pharmaceutical Sciences, University of Iceland, IS-107 Reykjavik, Iceland.
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41
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Fülöp Z, Kurkov S, Nielsen T, Larsen K, Loftsson T. Self-assembly of cyclodextrins: formation of cyclodextrin polymer based nanoparticles. J Drug Deliv Sci Technol 2012. [DOI: 10.1016/s1773-2247(12)50032-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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42
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Jiang L, Yan Y, Huang J. Versatility of cyclodextrins in self-assembly systems of amphiphiles. Adv Colloid Interface Sci 2011; 169:13-25. [PMID: 21839422 DOI: 10.1016/j.cis.2011.07.002] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 07/14/2011] [Accepted: 07/16/2011] [Indexed: 11/25/2022]
Abstract
Recently, cyclodextrins (CDs) were found to play important yet complicated (or even apparently opposite sometimes) roles in self-assembly systems of amphiphiles or surfactants. Herein, we try to review and clarify the versatility of CDs in surfactant assembly systems by 1) classifying the roles played by CDs into two groups (modulator and building unit) and four subgroups (destructive and constructive modulators, amphiphilic and unamphiphilic building units), 2) comparing these subgroups, and 3) analyzing mechanisms. As a modulator, although CDs by themselves do not participate into the final surfactant aggregates, they can greatly affect the aggregates in two ways. In most cases CDs will destroy the aggregates by depleting surfactant molecules from the aggregates (destructive), or in certain cases CDs can promote the aggregates to grow by selectively removing the less-aggregatable surfactant molecules from the aggregates (constructive). As an amphiphilic building unit, CDs can be chemically (by chemical bonds) or physically (by host-guest interaction) attached to a hydrophobic moiety, and the resultant compounds act as classic amphiphiles. As an unamphiphilic building unit, CD/surfactant complexes or even CDs on their own can assemble into aggregates in an unconventional, unamphiphilic manner driven by CD-CD H-bonds. Moreover, special emphasis is put on two recently appeared aspects: the constructive modulator and unamphiphilic building unit.
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Kurkov SV, Messner M, Lucassen M, van den Dobbelsteen DJ, den Engelsman J, Loftsson T. Evaluation of sugammadex self-association. Int J Pharm 2011; 413:134-9. [DOI: 10.1016/j.ijpharm.2011.04.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 04/13/2011] [Accepted: 04/15/2011] [Indexed: 01/17/2023]
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He Y, Shen X, Chen Q, Gao H. Characterization and mechanism study of micrometer-sized secondary assembly of β-cyclodextrin. Phys Chem Chem Phys 2011; 13:447-52. [DOI: 10.1039/c0cp00899k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Gasbarri C, Guernelli S, Boncompagni S, Angelini G, Siani G, De Maria P, Fontana A. Fine-tuning of POPC liposomal leakage by the use of beta-cyclodextrin and several hydrophobic guests. J Liposome Res 2010; 20:202-10. [PMID: 19848554 DOI: 10.3109/08982100903244526] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The effect of entrapped beta-cyclodextrin (beta-CD) on the stability of multilamellar vesicles (MLVs) of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), prepared by the dehydration-rehydration method, was studied by monitoring the release of 5(6)-carboxyfluorescein encapsulated into the liposomes. Different hydrophobic guests, such as Fullerene C(60), have been incorporated into the POPC bilayer in order to modify the membrane composition. The kinetic results as well as ESI-MS measurements evidenced that the destabilizing activity of beta-CD is due to the formation of beta-CD inclusion complexes and the consequent removal of selected bilayer constituents from the liposomal membrane. Hence, when beta-CD was added to the liposomes in the form of a strong, water-soluble 2:1 beta-CD/C(60) inclusion complex, such a destabilizing effect was not observed. However, the same beta-CD/C(60) inclusion complex does not form as a result of C(60) extraction from the bilayer. This may be attributed either to the overwhelming concentration of POPC with respect to C(60) and/or to the fact that C(60) is largely aggregated in the bilayer. Turbidimetric and fluorimetric determinations of lamellarity and entrapped volume of the studied MLVs provided further evidence of the alteration of the liposomal bilayer as a consequence of the addition of beta-CD and/or the presence of the studied guests.
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Affiliation(s)
- Carla Gasbarri
- Dipartimento di Scienze del Farmaco, Università G. d'Annunzio, Chieti, Italy
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Jaffer SS, Ghosh P, Das A, Purkayastha P. Opening of DNA double helix at room temperature: Application of alpha-cyclodextrin self-aggregates. NANOSCALE 2010; 2:1420-1422. [PMID: 20820727 DOI: 10.1039/c0nr00184h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Self-aggregation of alpha-cyclodextrin (alpha-CD) can induce DNA opening at room temperature (25 degrees C) owing to the hydroxyl groups on the surface of the spherical aggregates of alpha-CD, which promote hydrogen bonding with the flipped-out bases in DNA duplex prohibiting them from reverting back.
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Affiliation(s)
- Syed S Jaffer
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur, 741252, WB, India
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Loftsson T, Brewster ME. Pharmaceutical applications of cyclodextrins: basic science and product development. J Pharm Pharmacol 2010; 62:1607-21. [DOI: 10.1111/j.2042-7158.2010.01030.x] [Citation(s) in RCA: 600] [Impact Index Per Article: 42.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Abstract
Objectives
Drug pipelines are becoming increasingly difficult to formulate. This is punctuated by both retrospective and prospective analyses that show that while 40% of currently marketed drugs are poorly soluble based on the definition of the biopharmaceutical classification system (BCS), about 90% of drugs in development can be characterized as poorly soluble. Although a number of techniques have been suggested for increasing oral bioavailability and for enabling parenteral formulations, cyclodextrins have emerged as a productive approach. This short review is intended to provide both some basic science information as well as data on the ability to develop drugs in cyclodextrin-containing formulations.
Key findings
There are currently a number of marketed products that make use of these functional solubilizing excipients and new product introduction continues to demonstrate their high added value. The ability to predict whether cyclodextrins will be of benefit in creating a dosage form for a particular drug candidate requires a good working knowledge of the properties of cyclodextrins, their mechanism of solubilization and factors that contribute to, or detract from, the biopharmaceutical characteristics of the formed complexes.
Summary
We provide basic science information as well as data on the development of drugs in cyclodextrin-containing formulations. Cyclodextrins have emerged as an important tool in the formulator's armamentarium to improve apparent solubility and dissolution rate for poorly water-soluble drug candidates. The continued interest and productivity of these materials bode well for future application and their currency as excipients in research, development and drug product marketing.
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Affiliation(s)
- Thorsteinn Loftsson
- Faculty of Pharmaceutical Sciences, University of Iceland, Reykjavik, Iceland
| | - Marcus E Brewster
- Chemical and Pharmaceutical Development, Johnson & Johnson Pharmaceutical Research and Development, Janssen Pharmaceutica, Beerse, Belgium
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Sosnik A, Carcaboso ÁM, Glisoni RJ, Moretton MA, Chiappetta DA. New old challenges in tuberculosis: potentially effective nanotechnologies in drug delivery. Adv Drug Deliv Rev 2010; 62:547-59. [PMID: 19914315 DOI: 10.1016/j.addr.2009.11.023] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Accepted: 09/14/2009] [Indexed: 10/20/2022]
Abstract
Tuberculosis (TB) is the second most deadly infectious disease. Despite potentially curative pharmacotherapies being available for over 50 years, the length of the treatment and the pill burden can hamper patient lifestyle. Thus, low compliance and adherence to administration schedules remain the main reasons for therapeutic failure and contribute to the development of multi-drug-resistant (MDR) strains. Pediatric patients constitute a high risk population. Most of the first-line drugs are not commercially available in pediatric form. The design of novel antibiotics attempts to overcome drug resistance, to shorten the treatment course and to reduce drug interactions with antiretroviral therapies. On the other hand, the existing anti-TB drugs are still effective. Overcoming technological drawbacks of these therapeutic agents as well as improving the effectiveness of the drug by targeting the infection reservoirs remains the central aims of Pharmaceutical Technology. In this framework, nanotechnologies appear as one of the most promising approaches for the development of more effective and compliant medicines. The present review thoroughly overviews the state-of-the-art in the development of nano-based drug delivery systems for encapsulation and release of anti-TB drugs and discusses the challenges that are faced in the development of a more effective, compliant and also affordable TB pharmacotherapy.
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50
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Kurkov SV, Ukhatskaya EV, Loftsson T. Drug/cyclodextrin: beyond inclusion complexation. J INCL PHENOM MACRO 2010. [DOI: 10.1007/s10847-010-9756-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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