1
|
Xu Z, Zhu C, Shen H, Liu Y, Tang J, Weitz DA, Xu L. Enhancing drug solubility through competitive adsorption on silica nanosurfaces with ultrahigh silanol densities. Proc Natl Acad Sci U S A 2025; 122:e2423426122. [PMID: 39847323 PMCID: PMC11789088 DOI: 10.1073/pnas.2423426122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2024] [Accepted: 12/27/2024] [Indexed: 01/24/2025] Open
Abstract
We develop a technology based on competitive adsorption between drug molecules and water, specifically designed to address the critical issue of poor drug solubility. By specially engineering silica nanosurfaces with ultrahigh densities of silanol, we significantly enhance their affinity for both drug molecules and water, with a notably greater increase in water affinity. Such surfaces can effectively adsorb a variety of drug molecules under dry conditions. Upon exposure to water, these surfaces preferentially bind to water molecules, initiating a competitive adsorption process with the drug molecules. This competitive process turns water molecules from obstacles into catalysts for drug dissolution by actively displacing drug molecules from the surface, causing their rapid desorption and potentially enhancing their solubility by two to three orders of magnitude. The method is general, applicable to a wide array of drugs, stable for long-time storage, cost-effective, and scalable for mass production. Consequently, it has the potential to emerge as a next-generation platform for drug formulation and delivery.
Collapse
Affiliation(s)
- Zhuo Xu
- PharmaEase Tech Limited, Sheung Wan, Hong Kong, China
- Advanced Biomedical Instrumentation Centre, Hong Kong Science Park, Shatin, New Territories, Hong Kong, China
- The Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Changliang Zhu
- The Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Hongchuan Shen
- The Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Yuan Liu
- The Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Jiashen Tang
- The Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - David A. Weitz
- PharmaEase Tech Limited, Sheung Wan, Hong Kong, China
- Advanced Biomedical Instrumentation Centre, Hong Kong Science Park, Shatin, New Territories, Hong Kong, China
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA02138
- Department of Physics, Harvard University, Cambridge, MA02138
| | - Lei Xu
- PharmaEase Tech Limited, Sheung Wan, Hong Kong, China
- Advanced Biomedical Instrumentation Centre, Hong Kong Science Park, Shatin, New Territories, Hong Kong, China
- The Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| |
Collapse
|
2
|
Mohanan S, Guan X, Liang M, Karakoti A, Vinu A. Stimuli-Responsive Silica Silanol Conjugates: Strategic Nanoarchitectonics in Targeted Drug Delivery. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2301113. [PMID: 36967548 DOI: 10.1002/smll.202301113] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 02/28/2023] [Indexed: 06/18/2023]
Abstract
The design of novel drug delivery systems is exceptionally critical in disease treatments. Among the existing drug delivery systems, mesoporous silica nanoparticles (MSNs) have shown profuse promise owing to their structural stability, tunable morphologies/sizes, and ability to load different payload chemistry. Significantly, the presence of surface silanol groups enables functionalization with relevant drugs, imaging, and targeting agents, promoting their utility and popularity among researchers. Stimuli-responsive silanol conjugates have been developed as a novel, more effective way to conjugate, deliver, and release therapeutic drugs on demand and precisely to the selected location. Therefore, it is urgent to summarize the current understanding and the surface silanols' role in making MSN a versatile drug delivery platform. This review provides an analytical understanding of the surface silanols, chemistry, identification methods, and their property-performance correlation. The chemistry involved in converting surface silanols to a stimuli-responsive silica delivery system by endogenous/exogenous stimuli, including pH, redox potential, temperature, and hypoxia, is discussed in depth. Different chemistries for converting surface silanols to stimuli-responsive bonds are discussed in the context of drug delivery. The critical discussion is culminated by outlining the challenges in identifying silanols' role and overcoming the limitations in synthesizing stimuli-responsive mesoporous silica-based drug delivery systems.
Collapse
Affiliation(s)
- Shan Mohanan
- Global Innovative Centre for Advanced Nanomaterials, The School of Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, 2308, Australia
| | - Xinwei Guan
- Global Innovative Centre for Advanced Nanomaterials, The School of Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, 2308, Australia
| | - Mingtao Liang
- School of Biomedical Sciences and Pharmacy, College of Health Medicine and Wellbeing, The University of Newcastle, Callaghan, 2308, Australia
| | - Ajay Karakoti
- Global Innovative Centre for Advanced Nanomaterials, The School of Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, 2308, Australia
| | - Ajayan Vinu
- Global Innovative Centre for Advanced Nanomaterials, The School of Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, 2308, Australia
| |
Collapse
|
3
|
Budiman A, Anastasya G, Handini AL, Lestari IN, Subra L, Aulifa DL. Characterization of Drug with Good Glass-Forming Ability Loaded Mesoporous Silica Nanoparticles and Its Impact Toward in vitro and in vivo Studies. Int J Nanomedicine 2024; 19:2199-2225. [PMID: 38465205 PMCID: PMC10924831 DOI: 10.2147/ijn.s453873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 02/18/2024] [Indexed: 03/12/2024] Open
Abstract
Solid oral dosage forms are mostly preferred in pharmaceutical formulation development due to patient convenience, ease of product handling, high throughput, low manufacturing costs, with good physical and chemical stability. However, 70% of drug candidates have poor water solubility leading to compromised bioavailability. This phenomenon occurs because drug molecules are often absorbed after dissolving in gastrointestinal fluid. To address this limitation, delivery systems designed to improve the pharmacokinetics of drug molecules are needed to allow controlled release and target-specific delivery. Among various strategies, amorphous formulations show significantly high potential, particularly for molecules with solubility-limited dissolution rates. The ease of drug molecules to amorphized is known as their glass-forming ability (GFA). Specifically, drug molecules categorized into class III based on the Taylor classification have a low recrystallization tendency and high GFA after cooling, with substantial "glass stability" when heated. In the last decades, the application of mesoporous silica nanoparticles (MSNs) as drug delivery systems (DDS) has gained significant attention in various investigations and the pharmaceutical industry. This is attributed to the unique physicochemical properties of MSNs, including high loading capacity, recrystallization inhibition, excellent biocompatibility, and easy functionalization. Therefore, this study aimed to discuss the current state of good glass former drug loaded mesoporous silica and shows its impact on the pharmaceutical properties including dissolution and physical stability, along with in vivo study. The results show the importance of determining whether mesoporous structures are needed in amorphous formulations to improve the pharmaceutical properties of drug with a favorable GFA.
Collapse
Affiliation(s)
- Arif Budiman
- Department of Pharmaceutics and Pharmaceutical Technology, Universitas Padjadjaran, Bandung, Indonesia
| | - Gracia Anastasya
- Department of Pharmaceutics and Pharmaceutical Technology, Universitas Padjadjaran, Bandung, Indonesia
| | - Annisa Luthfiyah Handini
- Department of Pharmaceutics and Pharmaceutical Technology, Universitas Padjadjaran, Bandung, Indonesia
| | - Ira Novianty Lestari
- Department of Pharmaceutical Analysis and Medicinal Chemistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Laila Subra
- Department of Pharmacy, Universiti Geomatika Malaysia, Kuala Lumpur, Malaysia
| | - Diah Lia Aulifa
- Department of Pharmaceutical Analysis and Medicinal Chemistry, Universitas Padjadjaran, Bandung, Indonesia
| |
Collapse
|
4
|
Budiman A, Wardhana YW, Ainurofiq A, Nugraha YP, Qaivani R, Hakim SNAL, Aulifa DL. Drug-Coformer Loaded-Mesoporous Silica Nanoparticles: A Review of the Preparation, Characterization, and Mechanism of Drug Release. Int J Nanomedicine 2024; 19:281-305. [PMID: 38229702 PMCID: PMC10790662 DOI: 10.2147/ijn.s449159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 12/19/2023] [Indexed: 01/18/2024] Open
Abstract
Drug-coformer systems, such as coamorphous and cocrystal, are gaining recognition as highly effective strategies for enhancing the stability, solubility, and dissolution of drugs. These systems depend on the interactions between drug and coformer to prevent the conversion of amorphous drugs into the crystalline form and improve the solubility. Furthermore, mesoporous silica (MPS) is also a promising carrier commonly used for stabilization, leading to solubility improvement of poorly water-soluble drugs. The surface interaction of drug-MPS and the nanoconfinement effect prevent amorphous drugs from crystallizing. A novel method has been developed recently, which entails the loading of drug-coformer into MPS to improve the solubility, dissolution, and physical stability of the amorphous drug. This method uses the synergistic effects of drug-coformer interactions and the nanoconfinement effect within MPS. Several studies have reported successful incorporation of drug-coformer into MPS, indicating the potential for significant improvement in dissolution characteristics and physical stability of the drug. Therefore, this study aimed to discuss the preparation and characterization of drug-coformer within MPS, particularly the interaction in the nanoconfinement, as well as the impact on drug release and physical stability.
Collapse
Affiliation(s)
- Arif Budiman
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Bandung, West Java45363, Indonesia
| | - Yoga Windhu Wardhana
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Bandung, West Java45363, Indonesia
| | - Ahmad Ainurofiq
- Pharmaceutical Technology and Drug Delivery, Department of Pharmacy, Universitas Sebelas Maret, Surakarta, Central Java, 57126, Indonesia
| | - Yuda Prasetya Nugraha
- School of Pharmacy, Bandung Institute of Technology, Bandung, West Java, 40132, Indonesia
| | - Ridhatul Qaivani
- Department of Pharmaceutical Analysis and Medicinal Chemistry, Faculty of Pharmacy, Universitas Padjadjaran, Bandung, West Java, 45363, Indonesia
| | - Siti Nazila Awaliyyah Lukmanul Hakim
- Department of Pharmaceutical Analysis and Medicinal Chemistry, Faculty of Pharmacy, Universitas Padjadjaran, Bandung, West Java, 45363, Indonesia
| | - Diah Lia Aulifa
- Department of Pharmaceutical Analysis and Medicinal Chemistry, Faculty of Pharmacy, Universitas Padjadjaran, Bandung, West Java, 45363, Indonesia
| |
Collapse
|
5
|
Niederquell A, Vraníková B, Kuentz M. Study of Disordered Mesoporous Silica Regarding Intrinsic Compound Affinity to the Carrier and Drug-Accessible Surface Area. Mol Pharm 2023; 20:6301-6310. [PMID: 37948648 DOI: 10.1021/acs.molpharmaceut.3c00690] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
There is increasing research interest in using mesoporous silica for the delivery of poorly water-soluble drugs that are stabilized in a noncrystalline form. Most research has been done on ordered silica, whereas far fewer studies have been published on using nonordered mesoporous silica, and little is known about intrinsic drug affinity to the silica surface. The present mechanistic study uses inverse gas chromatography (IGC) to analyze the surface energies of three different commercially available disordered mesoporous silica grades in the gas phase. Using the more drug-like probe molecule octane instead of nitrogen, the concept of a "drug-accessible surface area" is hereby introduced, and the effect on drug monolayer capacity is addressed. In addition, enthalpic interactions of molecules with the silica surface were calculated based on molecular mechanics, and entropic energy contributions of volatiles were estimated considering molecular flexibility. These free energy contributions were used in a regression model, giving a successful comparison with experimental desorption energies from IGC. It is proposed that a simplified model for drugs based only on the enthalpic interactions can provide an affinity ranking to the silica surface. Following this preformulation research on mesoporous silica, future studies may harness the presented concepts to guide formulation scientists.
Collapse
Affiliation(s)
- Andreas Niederquell
- Department of Pharmaceutical Technology, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic
- School of Life Sciences FHNW, Institute for Pharma Technology, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstr. 30, 4132 Muttenz, Switzerland
| | - Barbora Vraníková
- Department of Pharmaceutical Technology, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic
| | - Martin Kuentz
- School of Life Sciences FHNW, Institute for Pharma Technology, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstr. 30, 4132 Muttenz, Switzerland
| |
Collapse
|
6
|
Lin J, Shi T, Wang Y, He Z, Mu Z, Cai X, Deng H, Shen J, Liu F. Hybrid Hydrogel Loaded with Chlorhexidine⊂β-CD-MSN Composites as Wound Dressing. Int J Nanomedicine 2023; 18:1725-1740. [PMID: 37025923 PMCID: PMC10072218 DOI: 10.2147/ijn.s401705] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Accepted: 02/21/2023] [Indexed: 04/03/2023] Open
Abstract
Background Much attention has been paid to sustained drug release and anti-infection in wound management. Hydrogels, which are biocompatible materials, are promising tools for controlled drug release and infective protection during wound healing. However, hydrogels also demonstrate limitations in the highly efficient treatment of wounds because of the diffusion rate. In this work, we explored pH-sensitive hydrogels that enable ultra-long-acting drug release and sustained antibacterial properties. Methods We constructed a hybrid gelatin methacrylate (GelMA) system with sustainable antibacterial properties combining hyaluronic acid (HA)-coated mesoporous silica nanoparticles (MSN), which loaded host-guest complexes of chlorhexidine (CHX) with β-cyclodextrins (β-CD) (CHX⊂CD-MSN@HA@GelMA). The release mechanism of CHX was explored using UV-vis spectra after intermittent diffusion of CHX. The hybrid hydrogels were characterized, and the drug content in terms of the release profile, bacterial inhibition, and in vivo experiments were investigated. Results Except for dual protection from both hydrogels, MSN in the HA improved the drug loading efficiency to promote the local drug concentration. It showed that complicated CHX-loaded MSN releases CHX more gradually and over a longer duration than CHX-loaded MSNs. This demonstrated a 12-day CHX release time and antibacterial activity, primarily attributable to the capacity of β-CD to form an inclusion complex with CHX. Meanwhile, in vivo experiments revealed that the hydrogels safely promote skin wound healing and enhance therapeutic efficacy. Conclusion We constructed pH-sensitive CHX⊂CD-MSN@HA@GelMA hydrogels that enable ultra-long-acting drug release and sustained antibacterial properties. The combination of β-CD and MSN would be better suited to release a reduced rate of active molecules over time (slow delivery), making them great candidates for wound dressing anti-infection materials.
Collapse
Affiliation(s)
- Jian Lin
- School & Hospital of Stomatology, Wenzhou Medical University, Wenzhou, People’s Republic of China
| | - Tianpeng Shi
- Department of Stomatology, PLA Strategic Support Force Medical Center, Beijing, People’s Republic of China
| | - Yi Wang
- School & Hospital of Stomatology, Wenzhou Medical University, Wenzhou, People’s Republic of China
| | - Zhiqi He
- School & Hospital of Stomatology, Wenzhou Medical University, Wenzhou, People’s Republic of China
| | - Zhixiang Mu
- School & Hospital of Stomatology, Wenzhou Medical University, Wenzhou, People’s Republic of China
| | - Xiaojun Cai
- School & Hospital of Stomatology, Wenzhou Medical University, Wenzhou, People’s Republic of China
| | - Hui Deng
- School & Hospital of Stomatology, Wenzhou Medical University, Wenzhou, People’s Republic of China
- Correspondence: Hui Deng; Fen Liu, Email ;
| | - Jianliang Shen
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology & Optometry, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, People’s Republic of China
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, People’s Republic of China
- Department of Regenerative Medicine, Vision, and Brain Health, Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision, and Brain Health), Wenzhou, People’s Republic of China
| | - Fen Liu
- Department of Histology and Embryology, Wenzhou Medical University, Wenzhou, People’s Republic of China
| |
Collapse
|
7
|
Shi Q, Moinuddin SM, Wang Y, Ahsan F, Li F. Physical stability and dissolution behaviors of amorphous pharmaceutical solids: Role of surface and interface effects. Int J Pharm 2022; 625:122098. [PMID: 35961416 DOI: 10.1016/j.ijpharm.2022.122098] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/28/2022] [Accepted: 08/05/2022] [Indexed: 11/24/2022]
Abstract
Amorphous pharmaceutical solids (APS) are single- or multi-component systems in which drugs exist in high-energy states with long-range disordered molecular packing. APSs have become one of the most effective and widely used pharmaceutical delivery approaches for poorly water-soluble drugs in the last several decades. Considerable efforts have been made to investigate the physical stability and dissolution behaviors of APSs, however, the underlying mechanisms remain imperfectly understood. Recent studies reveal that surface and interface properties of APSs could strongly affect the physical stability and dissolution behaviors. This paper provides a comprehensive overview of recent studies focusing on the physical stability and dissolution behaviors of APSs from both surface and interface perspectives. We highlight the role of surface or interface properties in nucleation, crystal growth, phase separation, dissolution, and supersaturation. Meanwhile, the challenges and scope of research on surface and interface properties in the future are also briefly discussed. This review contributes to a better understanding of the surface- and interface-facilitated processes, which will provide more efficient and rational guidance for the design of APSs.
Collapse
Affiliation(s)
- Qin Shi
- School of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng 224005, China.
| | - Sakib M Moinuddin
- California Northstate University, College of Pharmacy, 9700 West Taron Drive, Elk Grove, CA 95757, USA; East Bay Institute For Research & Education (EBIRE), 10535 Hospital Way, Bldg. 650 2nd Floor, Rm. 2B121A, Mather, CA 95655, USA
| | - Yanan Wang
- School of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng 224005, China
| | - Fakhrul Ahsan
- California Northstate University, College of Pharmacy, 9700 West Taron Drive, Elk Grove, CA 95757, USA; East Bay Institute For Research & Education (EBIRE), 10535 Hospital Way, Bldg. 650 2nd Floor, Rm. 2B121A, Mather, CA 95655, USA.
| | - Fang Li
- School of Pharmacy, Jiangsu Vocational College of Medicine, Yancheng 224005, China.
| |
Collapse
|
8
|
A Comparative Study of the Pharmaceutical Properties between Amorphous Drugs Loaded-Mesoporous Silica and Pure Amorphous Drugs Prepared by Solvent Evaporation. Pharmaceuticals (Basel) 2022; 15:ph15060730. [PMID: 35745649 PMCID: PMC9228546 DOI: 10.3390/ph15060730] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 05/27/2022] [Accepted: 06/02/2022] [Indexed: 12/05/2022] Open
Abstract
The formulation of poorly water-soluble drugs is one of the main challenges in the pharmaceutical industry, especially in the development of oral dosage forms. Meanwhile, there is an increase in the number of poorly soluble drugs that have been discovered as new chemical entities. It was also reported that the physical transformation of a drug from a crystalline form into an amorphous state could be used to increase its solubility. Therefore, this study aims to evaluate the pharmaceutical properties of amorphous drug loaded-mesoporous silica (MPS) and pure amorphous drugs. Ritonavir (RTV) was used as a model of a poorly water-soluble drug due to its low recrystallization tendency. RTV loaded-MPS (RTV/MPS) and RTV amorphous were prepared using the solvent evaporation method. Based on observation, a halo pattern in the powder X-ray diffraction pattern and a single glass transition (Tg) in the modulated differential scanning calorimetry (MDSC) curve was discovered in RTV amorphous, indicating its amorphization. The Tg was not detected in RTV/MPS, which showed that the loading RTV was completed. The solid-state NMR and FT-IR spectroscopy also showed the interaction between RTV and the surface of MPS in the mesopores. The high supersaturation of RTV was not achieved for both RTV/MPS and the amorphous state due to its strong interaction with the surface of MPS and was not properly dispersed in the medium, respectively. In the dissolution test, the molecular dispersion of RTV within MPS caused rapid dissolution at the beginning, while the amorphous showed a low rate due to its agglomeration. The stability examination showed that the loading process significantly improved the physical and chemical stability of RTV amorphous. These results indicated that the pharmaceutical properties of amorphous drugs could be improved by loaded-MPS.
Collapse
|
9
|
Characterization of Drugs with Good Glass Formers in Loaded-Mesoporous Silica and Its Theoretical Value Relevance with Mesopores Surface and Pore-Filling Capacity. Pharmaceuticals (Basel) 2022; 15:ph15010093. [PMID: 35056149 PMCID: PMC8778383 DOI: 10.3390/ph15010093] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 01/03/2022] [Accepted: 01/10/2022] [Indexed: 02/05/2023] Open
Abstract
The incorporation of a drug into mesoporous silica (MPS) is a promising strategy to stabilize its amorphous form. However, the drug within MPS has shown incomplete release, despite a supersaturated solution being generated. This indicates the determination of maximum drug loading in MPS below what is experimentally necessary to maximize the drug doses in the system. Therefore, this study aimed to characterize the drugs with good glass former loaded-mesoporous silica, determine the maximum drug loading, and compare its theoretical value relevance to monolayer covering the mesoporous (MCM) surface, as well as pore-filling capacity (PFC). Solvent evaporation and melt methods were used to load each drug into MPS. In addition, the glass transition of ritonavir (RTV) and cyclosporine A (CYP), as well as the melting peak of indomethacin (IDM) and saccharin (SAC) in mesoporous silica, were not discovered in the modulated differential scanning calorimetry (MDSC) curve, demonstrating that each drug was successfully incorporated into the mesopores. The amorphization of RTV-loaded MPS (RTV/MPS), CYP-loaded MPS (CYP/MPS), and IDM-loaded MPS (IDM/MPS) were confirmed as a halo pattern in powder X-ray diffraction measurements and a single glass transition event in the MDSC curve. Additionally, the good glass formers, nanoconfinement effect of MPS and silica surface interaction contributed to the amorphization of RTV, CYP and IDM within MPS. Meanwhile, the crystallization of SAC was observed in SAC-loaded MPS (SAC/MPS) due to its weak silica surface interaction and high recrystallization tendency. The maximum loading amount of RTV/MPS was experimentally close to the theoretical amount of MCM, showing monomolecular adsorption of RTV on the silica surface. On the other hand, the maximum loading amount of CYP/MPS and IDM/MPS was experimentally lower than the theoretical amount of MCM due to the lack of surface interaction. However, neither CYP or IDM occupied the entire silica surface, even though some drugs were adsorbed on the MPS surface. Moreover, the maximum loading amount of SAC/MPS was experimentally close to the theoretical amount of PFC, suggesting the multilayers of SAC within the MPS. Therefore, this study demonstrates that the characterization of drugs within MPS, such as molecular size and interaction of drug-silica surface, affects the loading efficiency of drugs within MPS that influence its relevance with the theoretical value of drugs.
Collapse
|
10
|
Shi Q, Li F, Yeh S, Moinuddin SM, Xin J, Xu J, Chen H, Ling B. Recent Advances in Enhancement of Dissolution and Supersaturation of Poorly Water-Soluble Drug in Amorphous Pharmaceutical Solids: A Review. AAPS PharmSciTech 2021; 23:16. [PMID: 34893936 DOI: 10.1208/s12249-021-02137-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 09/07/2021] [Indexed: 12/19/2022] Open
Abstract
Amorphization is one of the most effective pharmaceutical approaches to enhance the dissolution and oral bioavailability of poorly water-soluble drugs. In recent years, amorphous formulations have been experiencing rapid development both in theoretical and practical application. Based on using different types of stabilizing agents, amorphous formulations can be mainly classified as polymer-based amorphous solid dispersion, coamorphous formulation, mesoporous silica-based amorphous formulation, etc. This paper summarizes recent advances in the dissolution and supersaturation of these amorphous formulations. Moreover, we also highlight the roles of stabilizing agents such as polymers, low molecular weight co-formers, and mesoporous silica. Maintaining supersaturation in solution is a key factor for the enhancement of dissolution profile and oral bioavailability, and thus, the strategies and challenges for maintaining supersaturation are also discussed. With an in-depth understanding of the inherent mechanisms of dissolution behaviors, the design of amorphous pharmaceutical formulations will become more scientific and reasonable, leading to vigorous development of commercial amorphous drug products.
Collapse
|
11
|
Budiman A, Aulifa DL. Encapsulation of drug into mesoporous silica by solvent evaporation: A comparative study of drug characterization in mesoporous silica with various molecular weights. Heliyon 2021; 7:e08627. [PMID: 35005278 PMCID: PMC8715180 DOI: 10.1016/j.heliyon.2021.e08627] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 11/03/2021] [Accepted: 12/16/2021] [Indexed: 11/26/2022] Open
Abstract
Mesoporous silica (MS) is a promising material as a drug carrier that is used in pharmaceutical applications. It was discovered that the incorporation of drugs into MS has the potential to improve their dissolution and bioavailability due to the large specific surface area. This study aimed to characterize the drugs with various molecular weights in MS as well as to elucidate their impact on the loading amount and the amorphization within MS. The solvent evaporation method was used to encapsulate itraconazole (ITZ), nifedipine (NIF), and nicotinamide (NIC), respectively, into MS. The result shows the absence of glass transition and the melting peak of ITZ, NIF, and SAC within MS signifying the successful encapsulation. A hallo pattern was found in ITZ and NIF within MS indicating the amorphization. The high molecular weight and the interaction between the drug with the silica surface is reportedly contributed to the formation of the amorphous state. Meanwhile, the characteristic diffraction peaks of NIC crystal were observed for NIC within MS. In conclusion, the molecular weight of the drug has a significant effect on the loading amount and the amorphization of the drug within MS.
Collapse
Affiliation(s)
- Arif Budiman
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Jl. Raya Bandung-Sumedang Km. 21, Indonesia
| | - Diah Lia Aulifa
- Department of Pharmaceutical Analysis and Medicinal Chemistry, Faculty of Pharmacy, Universitas Padjadjaran, Jl. Raya Bandung-Sumedang Km. 21, Indonesia
| |
Collapse
|
12
|
Insights into the ameliorating ability of mesoporous silica in modulating drug release in ternary amorphous solid dispersion prepared by hot melt extrusion. Eur J Pharm Biopharm 2021; 165:244-258. [PMID: 34020023 DOI: 10.1016/j.ejpb.2021.04.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/16/2021] [Accepted: 04/19/2021] [Indexed: 11/23/2022]
Abstract
In this work, the application of various mesoporous silica grades in the preparation of stabilized ternary amorphous solid dispersions of Felodipine using hot melt extrusion was explored. We have demonstrated the effectiveness of mesoporous silica in these dispersions without the need for any organic solvents i.e., no pre-loading or immersion steps required. The physical and chemical properties, release profiles of the prepared formulations and the surface concentrations of the various molecular species were investigated in detail. Formulations containing 25 wt% and 50 wt% of Felodipine demonstrated enhanced stability and solubility of the drug substance compared to its crystalline counterpart. Based on the Higuchi model, ternary formulations exhibited a 2-step or 3-step release pattern which can be ascribed to the release of drug molecules from the organic polymer matrix and the external silica surface, followed by a release from the silica pore structure. According to the Korsmeyer-Peppas model, the release rate and release mechanism are governed by a complex quasi-Fickian release mechanism, in which multiple release mechanisms are occurring concurrently and consequently. Stability studies indicated that after 6 months storage of all formulation at 30% RH and 20 °C, Felodipine in all formulations remained stable in its amorphous state except for the formulation comprised of 40 wt% Syloid AL-1FP with a 50 wt% drug load.
Collapse
|
13
|
Huang W, Deng Y, Ye L, Xie Q, Jiang Y. Enhancing hemocompatibility and the performance of Au@silica nanoparticles by coating with cRGD functionalized zein. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 125:112064. [PMID: 33965097 DOI: 10.1016/j.msec.2021.112064] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 03/05/2021] [Accepted: 03/16/2021] [Indexed: 12/24/2022]
Abstract
Poor safety and effectiveness is an outstanding challenge in the preparation of drug delivery systems (DDS) for cancer treatment. The pursuit of the high curative effect will inevitably increase the risk of adverse side effects. Herein, a bio-safe DDS was constructed by combining the advantages of functional zein and Au doped mesoporous silica nanoparticles (Au@SiO2) to achieve chemo-photothermal therapy. The cRGD functionalized zein (cRGD-Zein) was coated on the surface of Au@SiO2 which effectively avoided premature leakage of paclitaxel and realized sustained drug release. Meanwhile, the high hemolysis rate (107%) of Au@SiO2 had been significantly reduced to 4%. The anti-hemolysis mechanism of functionalized zein was explored to give a deeper understanding of the interaction between nanoparticles and RBCs. The results showed that the functional zein would change the protein conformation during the interaction with Au@SiO2 to protect the RBCs from the damage of Au@SiO2. And the release rate of hemoglobin was limited by the size of RBCs membrane cracks with approximately 40 nm in width and 470 nm in length. The cell cytotoxicity and uptake assays showed that the prepared DDS exhibited low tumour cell viability (35%) and enhanced uptake performance (99.3%). This work suggested that the prepared nanoparticles could serve as a promising carrier to achieve safe and efficacious tumour therapy.
Collapse
Affiliation(s)
- Wenquan Huang
- Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Yuehua Deng
- Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Liping Ye
- Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Qiuling Xie
- College of Life Science and Technology, Jinan University, Guangzhou 510632, China; National Engineering Research Centre of Genetic Medicine, Guangzhou 510632, China.
| | - Yanbin Jiang
- Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
| |
Collapse
|
14
|
Effect of drug-coformer interactions on drug dissolution from a coamorphous in mesoporous silica. Int J Pharm 2021; 600:120492. [PMID: 33744448 DOI: 10.1016/j.ijpharm.2021.120492] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/24/2021] [Accepted: 03/11/2021] [Indexed: 11/22/2022]
Abstract
In this study, the molecular state of ritonavir (RTN)-saccharin (SAC) coamorphous incorporated into mesoporous silica by solvent evaporation and the effect of SAC on the RTN dissolution from mesopores were investigated. The amorphization of RTN-SAC was confirmed as a halo pattern in powder X-ray diffraction measurements and a single glass transition event in the modulated differential scanning calorimetry (MDSC) curve. 13C solid-state NMR spectroscopy revealed a hydrogen bond between the thiazole nitrogen of RTN and the amine proton of SAC. The glass transition of the RTN-SAC coamorphous in mesoporous silica was not found in the MDSC curve, indicating that RTN and SAC were monomolecularly incorporated into the mesopores. Solid-state NMR measurements suggested that the co-incorporation of SAC into the mesopores decreased the local mobility of the thiazole group of RTN via hydrogen bond formation. The RTN-SAC 1:1 coamorphous in mesoporous silica retained the X-ray halo-patterns after 30 d of storage, even under high temperature and humidity conditions. In the dissolution test, the RTN-SAC 1:1 coamorphous in mesoporous silica maintained RTN supersaturation for a longer time than the RTN amorphous in mesoporous silica. This study demonstrated that the drug-coformer interaction within mesoporous silica can significantly improve drug dissolution.
Collapse
|
15
|
Cheraghi M, Lorestani B, Zandipak R, Sobhanardakani S. GO@Fe3O4@ZnO@CS nanocomposite as a novel adsorbent for removal of doxorubicin hydrochloride from aqueous solutions. TOXIN REV 2021. [DOI: 10.1080/15569543.2020.1839910] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Mehrdad Cheraghi
- Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
| | - Bahareh Lorestani
- Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
| | - Raziyeh Zandipak
- Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
| | - Soheil Sobhanardakani
- Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
| |
Collapse
|
16
|
Wu Q, Feng D, Huang Z, Chen M, Yang D, Pan X, Lu C, Quan G, Wu C. Supersaturable organic-inorganic hybrid matrix based on well-ordered mesoporous silica to improve the bioavailability of water insoluble drugs. Drug Deliv 2020; 27:1292-1300. [PMID: 32885715 PMCID: PMC7580725 DOI: 10.1080/10717544.2020.1815898] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 08/24/2020] [Indexed: 12/01/2022] Open
Abstract
Mesoporous silica with uniform 2-D hexagonal pores has been newly employed as facile reservoir to impove the dissolution rate of water insoluble drugs. However, rapid drug release from mesoporous silica is usually accompanied by the generation of supersaturated solution, which leads to the drug precipitation and compromised absorption. To address this issue, a supersaturated ternary hybrid system was constructed in this study by utilizing inorganic mesoporous silica and organic precipitation inhibitor. Vinylprrolidone-vinylacetate copolymer (PVP VA64) with similar solubility parameter to model drug fenofibrate (FNB) was expected to well inhibit the precipitation. Mesoporous silica Santa Barbara amorphous-15 (SBA-15) was synthesized in acidic media and hybrid matrix was produced by hot melt extrusion technique. The results of in vitro supersaturation dissolution test obviously revealed that the presence of PVP VA64 could effectively sustain a higher apparent concentration. PVP VA64 was suggested to simultaneously reduce the rate of nucleation and crystal growth and subsequently maintain a metastable supersaturated state. The absorption of FNB delivered by the organic-inorganic hybrid matrix was remarkably enhanced in beagle dogs, and its AUC value was 1.92-fold higher than that of FNB loaded mesoporous silica without PVP VA 64. In conclusion, the supersaturated organic-inorganic hybrid matrix can serve as a modular strategy to enhance the oral availability of water insoluble drugs.
Collapse
Affiliation(s)
- Qiaoli Wu
- College of Pharmacy, Jinan University, Guangzhou, China
- Department of Pharmacy, Zengcheng District People’s Hospital, Guangzhou, China
| | - Disang Feng
- College of Pharmacy, Jinan University, Guangzhou, China
| | | | - Minglong Chen
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Dan Yang
- College of Pharmacy, Jinan University, Guangzhou, China
| | - Xin Pan
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| | - Chao Lu
- College of Pharmacy, Jinan University, Guangzhou, China
| | - Guilan Quan
- College of Pharmacy, Jinan University, Guangzhou, China
| | - Chuanbin Wu
- College of Pharmacy, Jinan University, Guangzhou, China
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, China
| |
Collapse
|
17
|
Zha L, Qian J, Wang B, Liu H, Zhang C, Dong Q, Chen W, Hong L. In vitro/in vivo evaluation of pH-sensitive Gambogenic acid loaded Zein nanoparticles with polydopamine coating. Int J Pharm 2020; 587:119665. [PMID: 32702449 DOI: 10.1016/j.ijpharm.2020.119665] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 07/05/2020] [Accepted: 07/15/2020] [Indexed: 02/08/2023]
Abstract
As one of the active pharmaceutical ingredients in Gamboge, Gambogenic acid (GNA) has shown diverse anti-tumor activities. To reduce the vascular irritation of GNA and improve its water solubility, tumor targeting, and bioavailability, GNA loaded Zein nanoparticles (GNA@Zein NPs) was further coated by polydopamine (PDA) to develop GNA@Zein-PDA NPs by anti-solvent precipitation and surface modification. The results showed that particle size and Zeta potential of GNA@Zein-PDA NPs were about 310 nm and -40.8 mV with core-shell morphology confirmed by TEM. GNA@Zein-PDA NPs increased the water solubility of GNA by more than 700 times and showed pH-sensitive release behavior in PBS with pH 6.86. In vitro cytotoxicity tests showed that GNA@Zein-PDA NPs had higher inhibitory activity on HepG2 cells than free GNA, and their IC50 were 1.59 μg/mL and 9.89 μg/mL, respectively. Additionally, the hemolysis and vascular irritation assay showed that GNA@Zein-PDA NPs had good cytocompatibility and reduced the irritation of GNA to blood vessels. Moreover, the in vivo pharmacokinetic experiments exhibited that the Cmax and AUC0-t of GNA@Zein-PDA NPs were significantly improved approximately by 2.09-fold and 3.48-fold over that of GNA, respectively. In conclusion, GNA@Zein-PDA NPs solve many defects of GNA and provide a tumor-targeting drug delivery for GNA.
Collapse
Affiliation(s)
- Liqiong Zha
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, China; Anhui Academy of Chinese Medicine, Hefei, Anhui, China
| | - Jiajia Qian
- Fudan University Shanghai Cancer Center Minhang Branch Hospital, Shanghai, China
| | - Beilei Wang
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, China; Anhui Academy of Chinese Medicine, Hefei, Anhui, China
| | - Huanhuan Liu
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, China; Anhui Academy of Chinese Medicine, Hefei, Anhui, China
| | - Caiyun Zhang
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, China; Anhui Academy of Chinese Medicine, Hefei, Anhui, China.
| | - Qiannian Dong
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, China; Anhui Academy of Chinese Medicine, Hefei, Anhui, China.
| | - Weidong Chen
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, China; Anhui Academy of Chinese Medicine, Hefei, Anhui, China.
| | - Lufeng Hong
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, China; Anhui Academy of Chinese Medicine, Hefei, Anhui, China
| |
Collapse
|
18
|
Hate SS, Reutzel-Edens SM, Taylor LS. Influence of Drug-Silica Electrostatic Interactions on Drug Release from Mesoporous Silica-Based Oral Delivery Systems. Mol Pharm 2020; 17:3435-3446. [PMID: 32790416 DOI: 10.1021/acs.molpharmaceut.0c00488] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mesoporous silica particles are attractive carriers for poorly soluble drugs whereby confinement of drugs in the mesopores leads to amorphization, which makes them potential carriers for enhanced oral delivery. However, interactions between the drug molecules and the silica surface can lead to incomplete drug release. The strength of the interaction depends on the silica surface chemistry, which varies as a function of pH, as well as on drug chemistry and ionization states. Herein, the adsorption and dissolution behavior of weakly basic drugs were evaluated as a function of pH to understand the impact of electrostatic interactions on the performance of mesoporous silica-based formulations. A higher adsorption was noted when the drug interacted with the silica surface via electrostatic interactions compared to hydrogen bonding. Higher adsorption, in turn, led to a lower extent of drug release. In two-stage release studies of drugs with pKa values close to the intestinal pH, a shift from low to higher pH solutions resulted in a decrease in the solution concentration. Further investigations demonstrated that this was due to readsorption of the drug, initially released in the acidic medium when the pH was increased. Two-stage release studies were also coupled with mass transport measurements. Only a slight improvement in drug release due to simultaneous absorption across a membrane was observed, suggesting strong drug adsorption to the silica surface arising from favorable electrostatic interactions, which diminishes the effect of sink conditions provided by the absorptive environment. This study highlights that physiological parameters, such as solution pH, are important considerations when designing mesoporous silica-based formulations for poorly soluble drugs. It also underscores the importance of incorporating in vivo-relevant conditions in in vitro testing to better evaluate these complex formulations due to the notable effect of dissolution media on the release behavior.
Collapse
Affiliation(s)
- Siddhi S Hate
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United States
| | - Susan M Reutzel-Edens
- Lilly Research Laboratories, Eli Lilly and Co., Indianapolis, Indiana 46285, United States
| | - Lynne S Taylor
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United States
| |
Collapse
|
19
|
Interplay of Adsorption, Supersaturation and the Presence of an Absorptive Sink on Drug Release from Mesoporous Silica-Based Formulations. Pharm Res 2020; 37:163. [DOI: 10.1007/s11095-020-02879-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 07/10/2020] [Indexed: 11/26/2022]
|
20
|
McCarthy CA, Zemlyanov DY, Crean AM, Taylor LS. Comparison of Drug Release and Adsorption under Supersaturating Conditions for Ordered Mesoporous Silica with Indomethacin or Indomethacin Methyl Ester. Mol Pharm 2020; 17:3062-3074. [PMID: 32633973 DOI: 10.1021/acs.molpharmaceut.0c00489] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Incomplete drug release from mesoporous silica systems has been observed in several studies. This work aims to increase the understanding of this phenomenon by investigating the mechanism of drug-silica interactions and adsorption behavior from supersaturated aqueous solutions of two similar drug molecules with different hydrogen bonding capabilities. Drug-silica interactions between indomethacin or its methyl ester and SBA-15 were investigated using spectroscopic techniques (infrared, fluorescence and X-ray photoelectron) and adsorption experiments. The results demonstrate that the predominant mechanism of interaction of both drugs with silica is hydrogen bonding between drug acceptor carbonyl groups with donor groups on the silica surface. The presence of a drug hydrogen bond donor group did not enhance drug adsorption. No evidence was obtained for drug adsorption through nonspecific hydrophobic interactions. Drug adsorption onto the silica surface was investigated under supersaturating conditions through the generation of adsorption isotherms. Similar adsorption isotherms were observed for each compound when the concentration scale was normalized to the drug amorphous solubility. In other words, the equilibrium between the drug adsorbed on the silica surface and free drug in solution was related to the drug activity in solution. The high tendency of the drug to adsorb when the solution is supersaturated was, in turn, found to limit the extent of drug release during dissolution under nonsink conditions. Thus, adsorption provides an explanation for incomplete drug release.
Collapse
Affiliation(s)
- Carol A McCarthy
- SSPC Pharm. Res. Centre, School of Pharmacy, University College Cork, Cork T12 YN60, Ireland
| | - Dmitry Y Zemlyanov
- Birck Nanotechnology Center, Purdue University, West Lafayette 47907, Indiana, United States
| | - Abina M Crean
- SSPC Pharm. Res. Centre, School of Pharmacy, University College Cork, Cork T12 YN60, Ireland
| | - Lynne S Taylor
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette 47907, Indiana, United States
| |
Collapse
|
21
|
Hybrid Systems Based on Talc and Chitosan for Controlled Drug Release. MATERIALS 2019; 12:ma12213634. [PMID: 31694168 PMCID: PMC6862275 DOI: 10.3390/ma12213634] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/19/2019] [Accepted: 10/22/2019] [Indexed: 02/08/2023]
Abstract
Inorganic matrices and biopolymers have been widely used in pharmaceutical fields. They show properties such as biocompatibility, incorporation capacity, and controlled drug release, which can become more attractive if they are combined to form hybrid materials. This work proposes the synthesis of new drug delivery systems (DDS) based on magnesium phyllosilicate (Talc) obtained by the sol–gel route method, the biopolymer chitosan (Ch), and the inorganic-organic hybrid formed between this matrix (Talc + Ch), obtained using glutaraldehyde as a crosslink agent, and to study their incorporation/release capacity of amiloride as a model drug. The systems were characterized by X-ray diffraction (XRD), Therma analysis TG/DTG, and Fourier-transform infrared spectroscopy (FTIR) that supported the DDS’s formation. The hybrid showed a better drug incorporation capacity compared to the precursors, with a loading of 55.74, 49.53, and 4.71 mg g−1 for Talc + Ch, Talc, and Ch, respectively. The release assays were performed on a Hanson Research SR-8 Plus dissolver using apparatus I (basket), set to guarantee the sink conditions. The in vitro release tests showed a prolongation of the release rates of this drug for at least 4 h. This result proposes that the systems implies the slow and gradual release of the active substance, favoring the maintenance of the plasma concentration within a therapeutic window.
Collapse
|