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Kundu S, Higashi K, Takamizawa M, Ueda K, Limwikrant W, Yamamoto K, Moribe K. Controlled Sublimation Rate of Guest Drug from Polymorphic Forms of a Cyclodextrin-Based Polypseudorotaxane Complex and Its Correlation with Molecular Dynamics as Probed by Solid-State NMR. Mol Pharm 2024; 21:1501-1514. [PMID: 38363209 DOI: 10.1021/acs.molpharmaceut.3c01148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
Encapsulation of active pharmaceutical ingredients (APIs) in confined spaces has been extensively explored as it dramatically alters the molecular dynamics and physical properties of the API. Herein, we explored the effect of encapsulation on the molecular dynamics and physical stability of a guest drug, salicylic acid (SA), confined in the intermolecular spaces of γ-cyclodextrin (γ-CD) and poly(ethylene glycol) (PEG)-based polypseudorotaxane (PPRX) structure. The sublimation tendency of SA encapsulated in three polymorphic forms of the γ-CD/PEG-based PPRX complex, monoclinic columnar (MC), hexagonal columnar (HC), and tetragonal columnar (TC), was investigated. The SA sublimation rate was decreased by 3.0-6.6-fold and varied in the order of MC form > HC form > TC form complex. The 13C and 1H magic-angle spinning (MAS) solid-state nuclear magnetic resonance (NMR) spectra and 13C spin-lattice relaxation time (T1) indicated that the encapsulated SA molecules existed as the monomeric form, and its molecular mobility increased in the order of MC form > HC form > TC form complex. In the complexes, a rapid chemical exchange between two dynamic states of SA (free and bound) was suggested, with varying adsorption/desorption rates accounting for its distinct molecular mobility. This adsorption/desorption process was influenced by proton exchange at the interaction site and interaction strength of SA in the complexes, as evidenced by 1H MAS spectra and temperature dependency of the 13C carbonyl chemical shift. A positive correlation between the molecular mobility of SA and its sublimation rate was established. Moreover, the molecular mobility of γ-CD and PEG in the complexes coincided with that of SA, which can be explained by fast guest-driven dynamics. This is the first report on the stability improvement of an API through complexation in polymorphic supramolecular host structures. The relationship between the molecular dynamics and physical properties of encapsulated API will aid in the rational design of drug delivery systems.
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Affiliation(s)
- Sudeshna Kundu
- Graduate School of Pharmaceutical Sciences, Chiba University, Inohana 1-8-1, Chuo-ku, Chiba 260-8675, Japan
| | - Kenjirou Higashi
- Graduate School of Pharmaceutical Sciences, Chiba University, Inohana 1-8-1, Chuo-ku, Chiba 260-8675, Japan
| | - Makoto Takamizawa
- Graduate School of Pharmaceutical Sciences, Chiba University, Inohana 1-8-1, Chuo-ku, Chiba 260-8675, Japan
| | - Keisuke Ueda
- Graduate School of Pharmaceutical Sciences, Chiba University, Inohana 1-8-1, Chuo-ku, Chiba 260-8675, Japan
| | - Waree Limwikrant
- Graduate School of Pharmaceutical Sciences, Chiba University, Inohana 1-8-1, Chuo-ku, Chiba 260-8675, Japan
- Department of Manufacturing Pharmacy, Faculty of Pharmacy, Mahidol University, 447 Sri Ayudhya Road, Ratchatewi, Bangkok 10400, Thailand
| | - Keiji Yamamoto
- Graduate School of Pharmaceutical Sciences, Chiba University, Inohana 1-8-1, Chuo-ku, Chiba 260-8675, Japan
| | - Kunikazu Moribe
- Graduate School of Pharmaceutical Sciences, Chiba University, Inohana 1-8-1, Chuo-ku, Chiba 260-8675, Japan
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Simon AG, Van Arsdale K, Wagner J, Barrow J. Effects of polydimethylsiloxane (PDMS) on triacetone triperoxide (TATP) volatilization. Forensic Chem 2022. [DOI: 10.1016/j.forc.2022.100413] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ruz V, González MM, Winant D, Rodríguez Z, Van den Mooter G. Characterization of the Sublimation and Vapor Pressure of 2-(2-Nitrovinyl) Furan (G-0) Using Thermogravimetric Analysis: Effects of Complexation with Cyclodextrins. Molecules 2015; 20:15175-91. [PMID: 26295385 PMCID: PMC6332437 DOI: 10.3390/molecules200815175] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Revised: 08/15/2015] [Accepted: 08/17/2015] [Indexed: 11/23/2022] Open
Abstract
In the present work, the sublimation of crystalline solid 2-(2-nitrovinyl) furan (G-0) in the temperature range of 35 to 60 °C (below the melting point of the drug) was studied using thermogravimetric analysis (TGA). The sublimated product was characterized using Fourier-transformed-infrared spectroscopy (FT-IR) and thin layer chromatography (TLC). The sublimation rate at each temperature was obtained using the slope of the linear regression model and followed apparent zero-order kinetics. The sublimation enthalpy from 35 to 60 °C was obtained from the Eyring equation. The Gückel method was used to estimate the sublimation rate and vapor pressure at 25 °C. Physical mixtures, kneaded and freeze-dried complexes were prepared with 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) and sulfobutyl ether-β-cyclodextrin (SBE-β-CD) and analyzed using isothermal TGA at 50 °C. The complexation contributed to reducing the sublimation process. The best results were achieved using freeze-dried complexes with both cyclodextrins.
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Affiliation(s)
- Vivian Ruz
- Departamento de Farmacia, Facultad de Química y Farmacia, Carretera a Camajuaní km 5½, Universidad Central de Las Villas, 54830 Villa Clara, Cuba.
| | - Mirtha Mayra González
- Departamento de Farmacia, Facultad de Química y Farmacia, Carretera a Camajuaní km 5½, Universidad Central de Las Villas, 54830 Villa Clara, Cuba.
| | - Danny Winant
- Department of Metallurgy and Material Engineering, Kasteelpark Arenberg 44, University of Leuven (KU Leuven), BE-3001 Heverlee, Belgium.
| | - Zenaida Rodríguez
- Centro de Bioactivos Químicos, Carretera a Camajuaní km 5½, Universidad Central de Las Villas, 54830 Villa Clara, Cuba.
| | - Guy Van den Mooter
- Drug Delivery and Disposition, Department of Pharmaceutical and Pharmacological Sciences, O & N2 Herestraat 49-Box 921, University of Leuven (KU Leuven), BE-3000 Leuven, Belgium.
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Mbah J, Knott D, Steward S. Thermogravimetric study of vapor pressure of TATP synthesized without recrystallization. Talanta 2014; 129:586-93. [PMID: 25127637 DOI: 10.1016/j.talanta.2014.06.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 06/14/2014] [Accepted: 06/16/2014] [Indexed: 10/25/2022]
Abstract
This study aims at characterizing the vapor pressure signatures generated by triacetone triperoxide (TATP) that was synthesized without recrystallization by thermogravimmetric analysis (TGA) for exploitation by standoff detection technologies of explosive devices. The thermal behavior of the nonrecrystallized sample was compared with reported values. Any phase change, melting point and decomposition identification were studied by differential scanning calorimeter. Vapor pressures were estimated by the Langmuir method of evaporation from an open surface in a vacuum. Vapor pressures of TATP at different temperatures were calculated using the linear logarithmic relationship obtained from benzoic acid reference standard. Sublimation of TATP was found to follow apparent zero-order kinetics and sublimes at steady rates at 298 K and above. While the enthalpy of sublimation found, 71.7 kJ mol(-1), is in agreement with reported values the vapor pressures deviated significantly. The differences in the vapor pressures behavior are attributable to the synthesis pathway chosen in this study.
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Affiliation(s)
- Jonathan Mbah
- Department of Chemical Engineering, Tuskegee University, Tuskegee, AL 36088, USA.
| | - Debra Knott
- Naval Explosive Ordnance Disposal Technology Division - Explosive Detection Equipment Program, Indian Head, MD 20640, USA
| | - Scott Steward
- Naval Explosive Ordnance Disposal Technology Division - Explosive Detection Equipment Program, Indian Head, MD 20640, USA
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Hikal WM, Weeks BL. In situ direct measurement of vapor pressures and thermodynamic parameters of volatile organic materials in the vapor phase: benzoic acid, ferrocene, and naphthalene. Chemphyschem 2013; 14:1920-5. [PMID: 23606455 DOI: 10.1002/cphc.201300182] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Indexed: 11/07/2022]
Abstract
We report the direct determination of vapor pressures and optical and thermodynamic parameters of powders of low-volatile materials in their vapor phase using a commercial UV/Vis spectrometer. This methodology is based on the linear proportionality between the density of the saturated gas of the material and the absorbance of the gas at different temperatures. The vapor pressure values determined for benzoic acid and ferrocene are in good agreement with those reported in the literature with ∼2-7 % uncertainty. Thermodynamic parameters of benzoic acid, ferrocene, and naphthalene are determined in situ at temperatures below their melting points. The sublimation enthalpies of the investigated organic molecules are in excellent agreement with the ICTAC recommended values (less than 1 % difference). This method has been used to measure vapor pressures and thermodynamic parameters of organic volatile materials with vapor pressures of ∼0.5-355 Pa in the 50-100 °C temperature range.
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Affiliation(s)
- Walid M Hikal
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA.
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Hikal WM, Weeks BL. Spectroscopic determination of enthalpies of sublimation of organic materials in the vapor phase: Benzoic acid, ferrocene, and naphthalene. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.01.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hikal WM, Paden JT, Weeks BL. Rapid estimation of thermodynamic parameters and vapor pressures of volatile materials at nanoscale. Chemphyschem 2012; 13:2729-33. [PMID: 22689500 DOI: 10.1002/cphc.201200355] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Indexed: 11/09/2022]
Abstract
Non-isothermal measurements of thermodynamic parameters and vapor pressures of low-volatile materials are favored when time is a crucial factor to be considered, such as in the case of detection of hazardous materials. In this article, we demonstrate that optical absorbance spectroscopy can be used non-isothermally to estimate the thermodynamic properties and vapor pressures of volatile materials with good accuracy. This is the first method to determine such parameters in nanoscale in just minutes. Trinitrotoluene (TNT) is chosen because of its low melting temperature, which makes it impossible to determine its thermodynamic parameter by other rising-temperature techniques, such as thermogravimetric analysis (TGA). The well-characterized vapor pressure of benzoic acid is used to calibrate the spectrometer in order to determine the vapor pressure of low-volatile TNT. The estimated thermodynamic properties of both benzoic acid and TNT are in excellent agreement with the literature. The estimated vapor pressure of TNT is one order of magnitude larger than that determined isothermally using the same method. However, the values are still within the range reported in the literature. The data indicate the high potential for use of rising-temperature absorbance spectroscopy in determining vapor pressures of materials at nanometer scale in minutes instead of hours or days.
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Affiliation(s)
- Walid M Hikal
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, USA.
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Brady JE, Smith JL, Hart CE, Oxley J. Estimating Ambient Vapor Pressures of Low Volatility Explosives by Rising-Temperature Thermogravimetry. PROPELLANTS EXPLOSIVES PYROTECHNICS 2012. [DOI: 10.1002/prep.201100077] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Oxley JC, Smith JL, Brady JE, Brown AC. Characterization and Analysis of Tetranitrate Esters. PROPELLANTS EXPLOSIVES PYROTECHNICS 2012. [DOI: 10.1002/prep.201100059] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Gao GY, Lin SY. Thermodynamic investigations of nitroxoline sublimation by simultaneous DSC-FTIR method and isothermal TG analysis. J Pharm Sci 2010; 99:255-61. [DOI: 10.1002/jps.21826] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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