1
|
Valenti S, Arioli M, Jamett A, Tamarit JL, Puiggalí J, Macovez R. Amorphous solid dispersions of curcumin in a poly(ester amide): Antiplasticizing effect on the glass transition and macromolecular relaxation dynamics, and controlled release. Int J Pharm 2023; 644:123333. [PMID: 37597594 DOI: 10.1016/j.ijpharm.2023.123333] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 07/20/2023] [Accepted: 08/17/2023] [Indexed: 08/21/2023]
Abstract
In order to exploit the pharmacological potential of natural bioactive molecules with low water solubility, such as curcumin, it is necessary to develop formulations, such as amorphous polymer dispersions, which allow a constant release rate and at the same time avoid possible toxicity effects of the crystalline form of the molecule under scrutiny. In this study, polymer dispersions of curcumin were obtained in PADAS, a biodegradable semicrystalline copolymer based on 1,12-dodecanediol, sebacic acid and alanine. The dispersions were fully characterized by means of differential scanning calorimetry and broadband dielectric spectroscopy, and the drug release profile was measured in a simulated body fluid. Amorphous homogeneous binary dispersions were obtained for curcumin mass fraction between 30 and 50%. Curcumin has significantly higher glass transition temperature Tg (≈ 347 K) than the polymer matrix (≈274-277 K depending on the molecular weight), and dispersions displayed Tg's intermediate between those of the pure amorphous components, implying that curcumin acts as an effective antiplasticizer for PADAS. Dielectric spectroscopy was employed to assess the relaxation dynamics of the binary dispersion with 30 wt% curcumin, as well as that of each (amorphous) component separately. The binary dispersion was characterized by a single structural relaxation, a single Johari-Goldstein process, and two local intramolecular processes, one for each component. Interestingly, the latter processes scaled with the Tg of the sample, indicating that they are viscosity-sensitive. In addition, both the pristine polymer and the dispersion exhibited an interfacial Maxwell-Wagner relaxation, likely due to spatial heterogeneities associated with phase disproportionation in this polymer. The release of curcumin from the dispersion in a simulated body fluid followed a Fickian diffusion profile, and 51% of the initial curcumin content was released in 48 h.
Collapse
Affiliation(s)
- Sofia Valenti
- Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain; Synthetic Polymers: Structure and Properties. Biodegradable Polymers, Departament de Enginyeria Química, Universitat Politècnica de Catalunya, EEBE, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain; Grup de Caracterització de Materials, Departament de Física, Universitat Politècnica de Catalunya, EEBE, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| | - Matteo Arioli
- Synthetic Polymers: Structure and Properties. Biodegradable Polymers, Departament de Enginyeria Química, Universitat Politècnica de Catalunya, EEBE, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| | - Alex Jamett
- Grup de Caracterització de Materials, Departament de Física, Universitat Politècnica de Catalunya, EEBE, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| | - Josep Lluís Tamarit
- Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain; Grup de Caracterització de Materials, Departament de Física, Universitat Politècnica de Catalunya, EEBE, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| | - Jordi Puiggalí
- Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain; Synthetic Polymers: Structure and Properties. Biodegradable Polymers, Departament de Enginyeria Química, Universitat Politècnica de Catalunya, EEBE, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain; Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), Carrer Baldiri i Reixac 11-15, E-08028 Barcelona, Catalonia, Spain
| | - Roberto Macovez
- Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain; Grup de Caracterització de Materials, Departament de Física, Universitat Politècnica de Catalunya, EEBE, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain.
| |
Collapse
|
2
|
Glass transition, crystallization kinetics, and inter-conformer relaxation dynamics of amorphous mitotane and related compounds. Int J Pharm 2022; 629:122390. [DOI: 10.1016/j.ijpharm.2022.122390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 11/07/2022] [Accepted: 11/08/2022] [Indexed: 11/14/2022]
|
3
|
Drug-Biopolymer Dispersions: Morphology- and Temperature- Dependent (Anti)Plasticizer Effect of the Drug and Component-Specific Johari-Goldstein Relaxations. Int J Mol Sci 2022; 23:ijms23052456. [PMID: 35269593 PMCID: PMC8910109 DOI: 10.3390/ijms23052456] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 02/17/2022] [Accepted: 02/20/2022] [Indexed: 02/04/2023] Open
Abstract
Amorphous molecule-macromolecule mixtures are ubiquitous in polymer technology and are one of the most studied routes for the development of amorphous drug formulations. For these applications it is crucial to understand how the preparation method affects the properties of the mixtures. Here, we employ differential scanning calorimetry and broadband dielectric spectroscopy to investigate dispersions of a small-molecule drug (the Nordazepam anxiolytic) in biodegradable polylactide, both in the form of solvent-cast films and electrospun microfibres. We show that the dispersion of the same small-molecule compound can have opposite (plasticizing or antiplasticizing) effects on the segmental mobility of a biopolymer depending on preparation method, temperature, and polymer enantiomerism. We compare two different chiral forms of the polymer, namely, the enantiomeric pure, semicrystalline L-polymer (PLLA), and a random, fully amorphous copolymer containing both L and D monomers (PDLLA), both of which have lower glass transition temperature (Tg) than the drug. While the drug has a weak antiplasticizing effect on the films, consistent with its higher Tg, we find that it actually acts as a plasticizer for the PLLA microfibres, reducing their Tg by as much as 14 K at 30%-weight drug loading, namely, to a value that is lower than the Tg of fully amorphous films. The structural relaxation time of the samples similarly depends on chemical composition and morphology. Most mixtures displayed a single structural relaxation, as expected for homogeneous samples. In the PLLA microfibres, the presence of crystalline domains increases the structural relaxation time of the amorphous fraction, while the presence of the drug lowers the structural relaxation time of the (partially stretched) chains in the microfibres, increasing chain mobility well above that of the fully amorphous polymer matrix. Even fully amorphous homogeneous mixtures exhibit two distinct Johari-Goldstein relaxation processes, one for each chemical component. Our findings have important implications for the interpretation of the Johari-Goldstein process as well as for the physical stability and mechanical properties of microfibres with small-molecule additives.
Collapse
|
4
|
Valenti S, Barrio M, Negrier P, Romanini M, Macovez R, Tamarit JL. Comparative Physical Study of Three Pharmaceutically Active Benzodiazepine Derivatives: Crystalline versus Amorphous State and Crystallization Tendency. Mol Pharm 2021; 18:1819-1832. [PMID: 33689364 PMCID: PMC8594866 DOI: 10.1021/acs.molpharmaceut.1c00081] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
![]()
Chemical derivatization and amorphization
are two possible strategies
to improve the solubility and bioavailability of drugs, which is a
key issue for the pharmaceutical industry. In this contribution, we
explore whether both strategies can be combined by studying how small
differences in the molecular structure of three related pharmaceutical
compounds affect their crystalline structure and melting point (Tm), the relaxation dynamics in the amorphous
phase, and the glass transition temperature (Tg), as well as the tendency toward recrystallization. Three
benzodiazepine derivatives of almost same molecular mass and structure
(Diazepam, Nordazepam and Tetrazepam) were chosen as model compounds.
Nordazepam is the only one that displays N–H···O
hydrogen bonds both in crystalline and amorphous phases, which leads
to a significantly higher Tm (by 70–80
K) and Tg (by 30–40 K) compared
to those of Tetrazepam and Diazepam (which display similar values
of characteristic temperatures). The relaxation dynamics in the amorphous
phase, as determined experimentally using broadband dielectric spectroscopy,
is dominated by a structural relaxation and a Johari–Goldstein
secondary relaxation, both of which scale with the reduced temperature T/Tg. The kinetic fragility
index is very low and virtually the same (mp ≈ 32) in all three compounds. Two more secondary relaxations
are observed in the glass state: the slower of the two has virtually
the same relaxation time and activation energy in all three compounds,
and is assigned to the inter-enantiomer conversion dynamics of the
flexible diazepine heterocycle between isoenergetic P and M conformations.
We tentatively assign the fastest secondary relaxation, present only
in Diazepam and Tetrazepam, to the rigid rotation of the fused diazepine–benzene
double ring relative to the six-membered carbon ring. Such motion
appears to be largely hindered in glassy Nordazepam, possibly due
to the presence of the hydrogen bonds. Supercooled liquid Tetrazepam
and Nordazepam are observed to crystallize into their stable crystalline
form with an Avrami exponent close to unity indicating unidimensional
growth with only sporadic nucleation, which allows a direct assessment
of the crystal growth rate. Despite the very similar growth mode,
the two derivatives exhibit very different kinetics for a fixed value
of the reduced temperature and thus of the structural relaxation time,
with Nordazepam displaying slower growth kinetics. Diazepam does not
instead display any tendency toward recrystallization over short periods
of time (even close to Tm). Both these
observations in three very similar diazepine derivatives provide direct
evidence that the kinetics of recrystallization of amorphous pharmaceuticals
is not a universal function, at least in the supercooled liquid phase,
of the structural or the conformational relaxation dynamics, and it
is not simply correlated with related parameters such as the kinetic
fragility or activation barrier of the structural relaxation. Only
the crystal growth rate, and not the nucleation rate, shows a correlation
with the presence or absence of hydrogen bonding.
Collapse
Affiliation(s)
- Sofia Valenti
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, Barcelona, Catalonia 08019, Spain
| | - Maria Barrio
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, Barcelona, Catalonia 08019, Spain
| | - Philippe Negrier
- Université Bordeaux, Laboratoire Ondes et Matière d'Aquitaine, UMR 5798, 351 Cours de la Libération, Talence F-33400, France
| | - Michela Romanini
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, Barcelona, Catalonia 08019, Spain
| | - Roberto Macovez
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, Barcelona, Catalonia 08019, Spain
| | - Josep-Lluis Tamarit
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, Barcelona, Catalonia 08019, Spain
| |
Collapse
|
5
|
Valenti S, Yousefzade O, Puiggalí J, Macovez R. Phase-selective conductivity enhancement and cooperativity length in PLLA/TPU nanocomposite blends with carboxylated carbon nanotubes. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122279] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
6
|
Dong W, He M, Ren F, Li Y, Hanada T, Lee S, Hakukawa H, Yamahira N, Horiuchi S. Interfacial stability of compatibilizers dictated by the thermodynamic interactions in an immiscible system and the effects of micelles on the crystallization of PLLA. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20190006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Wenyong Dong
- College of Material, Chemistry and Chemical EngineeringHangzhou Normal University, No.16 Xuelin Road Hangzhou 310036 China
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), AIST, 1‐1‐1 Higashi Tsukuba Ibaraki 305‐0031 Japan
| | - Meifeng He
- College of Material, Chemistry and Chemical EngineeringHangzhou Normal University, No.16 Xuelin Road Hangzhou 310036 China
| | - Fanglu Ren
- College of Material, Chemistry and Chemical EngineeringHangzhou Normal University, No.16 Xuelin Road Hangzhou 310036 China
| | - Yongjin Li
- College of Material, Chemistry and Chemical EngineeringHangzhou Normal University, No.16 Xuelin Road Hangzhou 310036 China
| | - Takeshi Hanada
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), AIST, 1‐1‐1 Higashi Tsukuba Ibaraki 305‐0031 Japan
| | - Sungdoke Lee
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), AIST, 1‐1‐1 Higashi Tsukuba Ibaraki 305‐0031 Japan
| | - Hideki Hakukawa
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), AIST, 1‐1‐1 Higashi Tsukuba Ibaraki 305‐0031 Japan
| | - Naohiro Yamahira
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), AIST, 1‐1‐1 Higashi Tsukuba Ibaraki 305‐0031 Japan
| | - Shin Horiuchi
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), AIST, 1‐1‐1 Higashi Tsukuba Ibaraki 305‐0031 Japan
| |
Collapse
|
7
|
Jin XZ, Yu X, Yang C, Qi XD, Lei YZ, Wang Y. Crystallization and hydrolytic degradation behaviors of poly(l-lactide) induced by carbon nanofibers with different surface modifications. Polym Degrad Stab 2019. [DOI: 10.1016/j.polymdegradstab.2019.109014] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
|
8
|
Valenti S, Diaz A, Romanini M, del Valle LJ, Puiggalí J, Tamarit JL, Macovez R. Amorphous binary dispersions of chloramphenicol in enantiomeric pure and racemic poly-lactic acid: Morphology, molecular relaxations, and controlled drug release. Int J Pharm 2019; 568:118565. [DOI: 10.1016/j.ijpharm.2019.118565] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 07/23/2019] [Accepted: 07/24/2019] [Indexed: 12/28/2022]
|
9
|
Romanini M, Rodriguez S, Valenti S, Barrio M, Tamarit JL, Macovez R. Nose Temperature and Anticorrelation between Recrystallization Kinetics and Molecular Relaxation Dynamics in Amorphous Morniflumate at High Pressure. Mol Pharm 2019; 16:3514-3523. [DOI: 10.1021/acs.molpharmaceut.9b00351] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Michela Romanini
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| | - Sergio Rodriguez
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| | - Sofia Valenti
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| | - María Barrio
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| | - Josep Lluis Tamarit
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| | - Roberto Macovez
- Grup de Caracterització de Materials, Departament de Física and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Campus Diagonal-Besòs, Av. Eduard Maristany 10-14, E-08019 Barcelona, Catalonia, Spain
| |
Collapse
|