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Wilkinson J, Ajulo D, Tamburrini V, Gall GL, Kimpe K, Holm R, Belton P, Qi S. Lipid based intramuscular long-acting injectables: current state of the art. Eur J Pharm Sci 2022; 178:106253. [DOI: 10.1016/j.ejps.2022.106253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 06/27/2022] [Accepted: 07/02/2022] [Indexed: 11/03/2022]
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2
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Wang J, Yang L, Li D, Xu Y, Yang L, Zhao H, Zhu Z, Luan H, Luo Q. Investigating the Mechanism of L-Valine in Improving the Stability of Gabapentin Combining Chemical Analysis Experiments with Computational Pharmacy. AAPS PharmSciTech 2019; 20:114. [PMID: 30761435 DOI: 10.1208/s12249-019-1312-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 01/14/2019] [Indexed: 11/30/2022] Open
Abstract
The mechanism of L-Val on how to improve the stability of gabapentin (GBP) was described by the combination of chemical analysis experiments and computer simulations. Scanning electron microscope (SEM), powder X-ray diffraction (PXRD), and differential scanning calorimeter (DSC), coupled with attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), were used to identify β-GBP prepared by rapid solvent removal method. The reaction barriers on crystal planes, β-GBP (100) and β-GBP (10-1), are smaller than α-GBP and γ-GBP, reaching 276.65 kJ/mol and 299.57 kJ/mol, respectively. Thus, it was easier for β-GBP to form lactam, and the occurrence of β-GBP would lead the worse stability of α-GBP. The addition of neutral amino acids such as L-Val could improve the stability of α-GBP effectively. The adsorption energy of α-GBP (002) crystal plane with L-Val is larger than that of other crystal planes, reaching 42.17 kJ/mol. Hydrogen bond was the combination of L-Val and GBP main crystal planes, which could inhibit the crystal transformation of α-GBP. These results suggest that neutral amino acid protectants, such as L-Val, could improve the stability of α-GBP effectively, and inhibition of crystal transformation is one of the effective methods to improve the stability of polymorphic drugs.
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Wang X, Zhang Y, Huang J, Tian C, Xia M, Liu L, Li Z, Cao J, Gui S, Chu X. A Novel Phytantriol-Based Lyotropic Liquid Crystalline Gel for Efficient Ophthalmic Delivery of Pilocarpine Nitrate. AAPS PharmSciTech 2019; 20:32. [PMID: 30603986 DOI: 10.1208/s12249-018-1248-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Accepted: 11/11/2018] [Indexed: 12/31/2022] Open
Abstract
The purpose of this paper was to investigate the potential of liquid crystalline (LC) gels for ophthalmic delivery, so as to enhance the bioavailability of pilocarpine nitrate (PN). The gels were prepared by a vortex method using phytantriol and water (in the ratio of 73:27 w/w). Their inner structures were confirmed by crossed polarized light microscopy, small-angle X-ray scattering, attenuated total reflectance-Fourier transform infrared spectrum, and rheology. The in vitro release studies revealed that PN could keep sustained release from the gels over a period of 12 h. The ex vivo apparent permeability coefficient of the gels demonstrated a 3.83-folds (P < 0.05) increase compared with that of eye drops. The corneal hydration levels of the gel maintained in the normal range of 79.46 ± 2.82%, hinting that the gel could be considered non-damaging and safe to the eyes. Furthermore, in vivo residence time evaluation suggested that a better retention performance of LC gel was observed in rabbit's eyes compared to eye drops. In vivo ocular irritation study indicated that LC gel was nonirritant and might be suitable for various eye applications. In conclusion, LC gels might represent a potential ophthalmic delivery strategy to overcome the limitations of eye drops.
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Wang X, Zhang Y, Gui S, Huang J, Cao J, Li Z, Li Q, Chu X. Characterization of Lipid-Based Lyotropic Liquid Crystal and Effects of Guest Molecules on Its Microstructure: a Systematic Review. AAPS PharmSciTech 2018; 19:2023-2040. [PMID: 29869308 DOI: 10.1208/s12249-018-1069-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 05/01/2018] [Indexed: 12/16/2022] Open
Abstract
Liquid crystals (LCs) are conventionally divided into thermotropic or lyotropic, based on the organization and sequence of the controlled molecular system. Lipid-based lyotropic liquid crystal (LLC), such as lamellar (Lα), bicontinuous cubic (QII), or hexagonal (HII) phases, have attracted wide interest in the last few decades due to their practical potential in diverse applications and notable structural complexity. Various guest molecules, such as biopharmaceuticals, chemicals, and additives, can be solubilized in either aqueous or oily phase. And the LLC microstructure can be altered to affect the rate of drug release eventually. To utilize these microstructural variations to adjust the drug release in drug delivery system (DDS), it is crucial to understand the structure variations of the LLC caused by different types of guest molecules. Therefore, in this article, we review the effect of guest molecules on lipid-based LLC microstructures. In particular, we focus on the different characterization methods to evaluate this change caused by guest substances, such as polarized light microscopy (PLM), small-angle X-ray scattering (SAXS), Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), self-diffusion nuclear magnetic resonance (SD-NMR), and so on.
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Martin CJ, Alcock N, Hiom S, Birchall JC. Development and Evaluation of Topical Gabapentin Formulations. Pharmaceutics 2017; 9:E31. [PMID: 28867811 PMCID: PMC5620572 DOI: 10.3390/pharmaceutics9030031] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 08/17/2017] [Accepted: 08/22/2017] [Indexed: 11/16/2022] Open
Abstract
Topical delivery of gabapentin is desirable to treat peripheral neuropathic pain conditions whilst avoiding systemic side effects. To date, reports of topical gabapentin delivery in vitro have been variable and dependent on the skin model employed, primarily involving rodent and porcine models. In this study a variety of topical gabapentin formulations were investigated, including Carbopol® hydrogels containing various permeation enhancers, and a range of proprietary bases including a compounded Lipoderm® formulation; furthermore microneedle facilitated delivery was used as a positive control. Critically, permeation of gabapentin across a human epidermal membrane in vitro was assessed using Franz-type diffusion cells. Subsequently this data was contextualised within the wider scope of the literature. Although reports of topical gabapentin delivery have been shown to vary, largely dependent upon the skin model used, this study demonstrated that 6% (w/w) gabapentin 0.75% (w/w) Carbopol® hydrogels containing 5% (w/w) DMSO or 70% (w/w) ethanol and a compounded 10% (w/w) gabapentin Lipoderm® formulation were able to facilitate permeation of the molecule across human skin. Further pre-clinical and clinical studies are required to investigate the topical delivery performance and pharmacodynamic actions of prospective formulations.
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Affiliation(s)
| | - Natalie Alcock
- Cardiff School of Pharmacy and Pharmaceutical Sciences, Redwood Building, King Edward VII Avenue, Cardiff University, Cardiff CF10 3NB, UK.
| | - Sarah Hiom
- St Mary's Pharmaceutical Unit, Cardiff and Vale UHB, Cardiff CF14 4HY, UK.
| | - James C Birchall
- Cardiff School of Pharmacy and Pharmaceutical Sciences, Redwood Building, King Edward VII Avenue, Cardiff University, Cardiff CF10 3NB, UK.
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Cohen-Avrahami M, Shames AI, Ottaviani MF, Aserin A, Garti N. On the correlation between the structure of lyotropic carriers and the delivery profiles of two common NSAIDs. Colloids Surf B Biointerfaces 2014; 122:231-240. [DOI: 10.1016/j.colsurfb.2014.04.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 04/25/2014] [Accepted: 04/29/2014] [Indexed: 01/20/2023]
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Cohen-Avrahami M, Shames AI, Ottaviani MF, Aserin A, Garti N. HIV-TAT Enhances the Transdermal Delivery of NSAID Drugs from Liquid Crystalline Mesophases. J Phys Chem B 2014; 118:6277-87. [DOI: 10.1021/jp412739p] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Marganit Cohen-Avrahami
- Casali
Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 9190401, Israel
| | - Alexander I. Shames
- Department
of Physics, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel
| | - M. Francesca Ottaviani
- Department
of Earth, Life and Environment Sciences, University of Urbino, Località
Crocicchia, Urbino 61029, Italy
| | - Abraham Aserin
- Casali
Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 9190401, Israel
| | - Nissim Garti
- Casali
Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 9190401, Israel
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Cohen-Avrahami M, Libster D, Aserin A, Garti N. Penetratin-induced transdermal delivery from HII mesophases of sodium diclofenac. J Control Release 2012; 159:419-28. [DOI: 10.1016/j.jconrel.2012.01.025] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2011] [Revised: 01/18/2012] [Accepted: 01/20/2012] [Indexed: 10/14/2022]
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Bitan-Cherbakovsky L, Libster D, Ottaviani MF, Aserin A, Garti N. Structural Behavior and Interactions of Dendrimer within Lyotropic Liquid Crystals, Monitored by EPR Spectroscopy and Rheology. J Phys Chem B 2012; 116:2420-9. [DOI: 10.1021/jp212008a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Liron Bitan-Cherbakovsky
- The Ratner Chair of Chemistry,
Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra
Campus, Givat Ram, Jerusalem 91904, Israel
| | - Dima Libster
- The Ratner Chair of Chemistry,
Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra
Campus, Givat Ram, Jerusalem 91904, Israel
| | - Maria Francesca Ottaviani
- Department of Earth, Life and
Environment Sciences, University of Urbino, Località Crocicchia, Urbino 61029, Italy
| | - Abraham Aserin
- The Ratner Chair of Chemistry,
Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra
Campus, Givat Ram, Jerusalem 91904, Israel
| | - Nissim Garti
- The Ratner Chair of Chemistry,
Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra
Campus, Givat Ram, Jerusalem 91904, Israel
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Bitan-Cherbakovsky L, Libster D, Aserin A, Garti N. Complex dendrimer-lyotropic liquid crystalline systems: structural behavior and interactions. J Phys Chem B 2011; 115:11984-92. [PMID: 21902258 DOI: 10.1021/jp2030939] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The incorporation of dendrimer into three lyotropic liquid crystalline (LLCs) mesophases is demonstrated for the first time. A second generation (G2) of poly(propylene imine) dendrimer (PPI) was solubilized into lamellar, diamond reverse cubic, and reverse hexagonal LLCs composed of glycerol monooleate (GMO), and water (and D-α-tocopherol in the H(II) system). The combination of PPI with LLCs may provide an advantageous drug delivery system. Cross-polarized light microscope, small-angle X-ray scattering (SAXS), and attenuated total reflectance Fourier transform infrared (ATR-FTIR) were utilized to study the structural behavior of the mesophases, the localization of PPI within the system, and the interactions between the guest molecule and the system's components. It was revealed that PPI-G2 functioned as a "water pump", competing with the lipid headgroups for water binding. As a result, L(α)→H(II) and Q(224)→H(II) structural shifts were detected (at 10 wt % PPI-G2 content), probably caused by the dehydration of monoolein headgroups and subsequent increase of the lipid's critical packing parameter (CPP). In the case of H(II), as a result of the balance between the dehydration of the monoolein headgroups and the significant presence of PPI within the interfacial region, increasing the quantity of hydrogen bonds, no structural transitions occurred. ATR-FTIR analysis demonstrated a downward shift of the H-O-H (water), as a result of PPI-G2 embedment, suggesting an increase in the mean water-water H-bond angle resulting from binding PPI-G2 to the water network. Additionally, the GMO hydroxyl groups at β- and γ-C-OH positions revealed a partial interaction of hydrogen bonds with N-H functional groups of the protonated PPI-G2. Other GMO interfacial functional groups were shown to interact with the PPI-G2, in parallel with the GMO dehydration phenomenon. In the future, these outcomes can be used to design advanced drug delivery systems, allowing administration of dendrimers as a therapeutic agent from LLCs.
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Affiliation(s)
- Liron Bitan-Cherbakovsky
- Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
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Cohen-Avrahami M, Libster D, Aserin A, Garti N. Sodium Diclofenac and Cell-Penetrating Peptides Embedded in HII Mesophases: Physical Characterization and Delivery. J Phys Chem B 2011; 115:10189-97. [DOI: 10.1021/jp112067v] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Marganit Cohen-Avrahami
- The Ratner Chair of Chemistry, Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Dima Libster
- The Ratner Chair of Chemistry, Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Abraham Aserin
- The Ratner Chair of Chemistry, Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Nissim Garti
- The Ratner Chair of Chemistry, Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
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Amar-Zrihen N, Aserin A, Garti N. Food volatile compounds facilitating HII mesophase formation: solubilization and stability. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:5554-5564. [PMID: 21495722 DOI: 10.1021/jf200466e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Four lipophilic food volatile molecules of different chemical characteristics, phenylacetaldehyde, 2,6-dimethyl-5-heptenal, linalool, and trans-4-decenal, were solubilized into binary mixtures of monoolein/water, facilitating the formation of reverse hexagonal (H(II)) mesophases at room temperature without the need of solvents or triglycerides. Some of the flavor compounds are important building blocks of the hexagonal mesostructure, preventing phase transition with aging. The solubilization loads were relatively high: 12.6, 10.0, 12.6, and 10.0 wt % for phenylacetaldehyde, 2,6-dimethyl-5-heptenal, linalool, and trans-4-decenal, respectively. Phenylacetaldehyde formed mixtures of lamellar and cubic phases. Linalool, 2,6-dimethyl-5-heptenal, and trans-4-decenal induced structural shift from lamellar directly to H(II) mesophase, remaining stable at room temperature. Lattice parameters were found to increase with water content and to decrease with temperature and/or food volatile content. trans-4-Decenal produces more stable H(II) mesophase compared to linalool-loaded mesophase. At 40-60 °C, depending on the chemical structure and on the solubilization location of the food volatile compounds, the H(II) mesophase transforms to isotropic micellar phase, facilitating the release of the food volatile compounds. Molecular interactions suggest the existence of two consecutive stages in the solubilization process.
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Affiliation(s)
- Natali Amar-Zrihen
- The Ratner Chair of Chemistry, Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
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Libster D, Aserin A, Garti N. Interactions of biomacromolecules with reverse hexagonal liquid crystals: Drug delivery and crystallization applications. J Colloid Interface Sci 2011; 356:375-86. [DOI: 10.1016/j.jcis.2011.01.047] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Revised: 01/13/2011] [Accepted: 01/14/2011] [Indexed: 11/26/2022]
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