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Andreana I, Chiapasco M, Bincoletto V, Digiovanni S, Manzoli M, Ricci C, Del Favero E, Riganti C, Arpicco S, Stella B. Targeting pentamidine towards CD44-overexpressing cells using hyaluronated lipid-polymer hybrid nanoparticles. Drug Deliv Transl Res 2024; 14:2100-2111. [PMID: 38709442 DOI: 10.1007/s13346-024-01617-7] [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] [Accepted: 04/29/2024] [Indexed: 05/07/2024]
Abstract
Biodegradable nanocarriers possess enormous potential for use as drug delivery systems that can accomplish controlled and targeted drug release, and a wide range of nanosystems have been reported for the treatment and/or diagnosis of various diseases and disorders. Of the various nanocarriers currently available, liposomes and polymer nanoparticles have been extensively studied and some formulations have already reached the market. However, a combination of properties to create a single hybrid system can give these carriers significant advantages, such as improvement in encapsulation efficacy, higher stability, and active targeting towards specific cells or tissues, over lipid or polymer-based platforms. To this aim, this work presents the formulation of poly(lactic-co-glycolic) acid (PLGA) nanoparticles in the presence of a hyaluronic acid (HA)-phospholipid conjugate (HA-DPPE), which was used to anchor HA onto the nanoparticle surface and therefore create an actively targeted hybrid nanosystem. Furthermore, ionic interactions have been proposed for drug encapsulation, leading us to select the free base form of pentamidine (PTM-B) as the model drug. We herein report the preparation of hybrid nanocarriers that were loaded via ion-pairing between the negatively charged PLGA and HA and the positively charged PTM-B, demonstrating an improved loading capacity compared to PLGA-based nanoparticles. The nanocarriers displayed a size of below 150 nm, a negative zeta potential of -35 mV, a core-shell internal arrangement and high encapsulation efficiency (90%). Finally, the ability to be taken up and exert preferential and receptor-mediated cytotoxicity on cancer cells that overexpress the HA specific receptor (CD44) has been evaluated. Competition assays supported the hypothesis that PLGA/HA-DPPE nanoparticles deliver their cargo within cells in a CD44-dependent manner.
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Affiliation(s)
- Ilaria Andreana
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Torino, Italy
| | - Marta Chiapasco
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Torino, Italy
| | - Valeria Bincoletto
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Torino, Italy
| | | | - Maela Manzoli
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Torino, Italy
| | - Caterina Ricci
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università di Milano, Milano, Italy
| | - Elena Del Favero
- Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università di Milano, Milano, Italy
| | - Chiara Riganti
- Dipartimento di Oncologia, Università di Torino, Torino, Italy
| | - Silvia Arpicco
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Torino, Italy
| | - Barbara Stella
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Torino, Italy.
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Mehrotra S, Kalyan BG P, Nayak PG, Joseph A, Manikkath J. Recent Progress in the Oral Delivery of Therapeutic Peptides and Proteins: Overview of Pharmaceutical Strategies to Overcome Absorption Hurdles. Adv Pharm Bull 2024; 14:11-33. [PMID: 38585454 PMCID: PMC10997937 DOI: 10.34172/apb.2024.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 07/04/2023] [Accepted: 08/16/2023] [Indexed: 04/09/2024] Open
Abstract
Purpose Proteins and peptides have secured a place as excellent therapeutic moieties on account of their high selectivity and efficacy. However due to oral absorption limitations, current formulations are mostly delivered parenterally. Oral delivery of peptides and proteins (PPs) can be considered the need of the hour due to the immense benefits of this route. This review aims to critically examine and summarize the innovations and mechanisms involved in oral delivery of peptide and protein drugs. Methods Comprehensive literature search was undertaken, spanning the early development to the current state of the art, using online search tools (PubMed, Google Scholar, ScienceDirect and Scopus). Results Research in oral delivery of proteins and peptides has a rich history and the development of biologics has encouraged additional research effort in recent decades. Enzyme hydrolysis and inadequate permeation into intestinal mucosa are the major causes that result in limited oral absorption of biologics. Pharmaceutical and technological strategies including use of absorption enhancers, enzyme inhibition, chemical modification (PEGylation, pro-drug approach, peptidomimetics, glycosylation), particulate delivery (polymeric nanoparticles, liposomes, micelles, microspheres), site-specific delivery in the gastrointestinal tract (GIT), membrane transporters, novel approaches (self-nanoemulsifying drug delivery systems, Eligen technology, Peptelligence, self-assembling bubble carrier approach, luminal unfolding microneedle injector, microneedles) and lymphatic targeting, are discussed. Limitations of these strategies and possible innovations for improving oral bioavailability of protein and peptide drugs are discussed. Conclusion This review underlines the application of oral route for peptide and protein delivery, which can direct the formulation scientist for better exploitation of this route.
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Affiliation(s)
- Sonal Mehrotra
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka State, India
| | - Pavan Kalyan BG
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka State, India
| | - Pawan Ganesh Nayak
- Department of Pharmacology,Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka State, India
| | | | - Jyothsna Manikkath
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka State, India
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Michurov DA, Makhina TK, Siracusa V, Bonartsev AP, Lozinsky VI, Iordanskii AL. Cryo-Structuring of Polymeric Systems. Poly(Vinyl Alcohol)-Based Cryogels Loaded with the Poly(3-hydroxybutyrate) Microbeads and the Evaluation of Such Composites as the Delivery Vehicles for Simvastatin. Polymers (Basel) 2022; 14:polym14112196. [PMID: 35683869 PMCID: PMC9182817 DOI: 10.3390/polym14112196] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 05/17/2022] [Accepted: 05/19/2022] [Indexed: 02/06/2023] Open
Abstract
Highly porous composite poly(vinyl alcohol) (PVA) cryogels loaded with the poly(3-hydroxybutyrate) (PHB) microbeads containing the drug, simvastatin (SVN), were prepared via cryogenic processing (freezing—storing frozen—defrosting) of the beads’ suspensions in aqueous PVA solution. The rigidity of the resultant composite cryogels increased with increasing the filler content. Optical microscopy of the thin section of such gel matrices revealed macro-porous morphology of both continuous (PVA cryogels) and discrete (PHB-microbeads) phases. Kinetic studies of the SVN release from the drug-loaded microbeads, the non-filled PVA cryogel and the composite material showed that the cryogel-based composite system could potentially serve as a candidate for the long-term therapeutic system for controlled drug delivery. Such PHB-microbeads-containing PVA-cryogel-based composite drug delivery carriers were unknown earlier; their preparation and studies have been performed for the first time.
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Affiliation(s)
- Dmitrii A. Michurov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov Street, 28, 119991 Moscow, Russia;
- Faculty of Biology, M.V. Lomonosov Moscow State University, 119234 Moscow, Russia;
| | - Tatiana K. Makhina
- Research Center of Biotechnology of the Russian Academy of Sciences, 33, Bld. 2 Leninskiy Ave., 119071 Moscow, Russia;
| | - Valentina Siracusa
- Department of Chemical Science (DSC), University of Catania, Viale A. Doria 6, 95125 Catania, Italy
- Correspondence: (V.S.); (V.I.L.)
| | - Anton P. Bonartsev
- Faculty of Biology, M.V. Lomonosov Moscow State University, 119234 Moscow, Russia;
| | - Vladimir I. Lozinsky
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov Street, 28, 119991 Moscow, Russia;
- Correspondence: (V.S.); (V.I.L.)
| | - Alexey L. Iordanskii
- N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Kosygin Street, 4, 119991 Moscow, Russia;
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Paulo F, Tavares L, Santos L. Extraction and encapsulation of bioactive compounds from olive mill pomace: influence of loading content on the physicochemical and structural properties of microparticles. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2022. [DOI: 10.1007/s11694-022-01408-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Abstract
Pentamidine (PTM), which is a diamine that is widely known for its antimicrobial activity, is a very interesting drug whose mechanism of action is not fully understood. In recent years, PTM has been proposed as a novel potential drug candidate for the treatment of mental illnesses, myotonic dystrophy, diabetes, and tumors. Nevertheless, the systemic administration of PTM causes severe side effects, especially nephrotoxicity. In order to efficiently deliver PTM and reduce its side effects, several nanosystems that take advantage of the chemical characteristics of PTM, such as the presence of two positively charged amidine groups at physiological pH, have been proposed as useful delivery tools. Polymeric, lipidic, inorganic, and other types of nanocarriers have been reported in the literature for PTM delivery, and they are all in different development phases. The available approaches for the design of PTM nanoparticulate delivery systems are reported in this review, with a particular emphasis on formulation strategies and in vitro/in vivo applications. Furthermore, a critical view of the future developments of nanomedicine for PTM applications, based on recent repurposing studies, is provided. Created with BioRender.com.
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Pillai SC, Borah A, Le MNT, Kawano H, Hasegawa K, Kumar DS. Co-Delivery of Curcumin and Bioperine via PLGA Nanoparticles to Prevent Atherosclerotic Foam Cell Formation. Pharmaceutics 2021; 13:pharmaceutics13091420. [PMID: 34575496 PMCID: PMC8468720 DOI: 10.3390/pharmaceutics13091420] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/20/2021] [Accepted: 09/03/2021] [Indexed: 12/12/2022] Open
Abstract
Cholesterol-rich arterial plaques characterize atherosclerosis, a significant cause of heart disease. Nutraceuticals have received attention over the years, demonstrating potential benefits towards treating and preventing cardiovascular diseases (CVD), including atherosclerosis. Curcumin, a potent polyphenol present in Curcuma longa, has shown remarkable anti-atherosclerotic activity via anti-inflammatory and anti-oxidative properties. The bioavailability and low water solubility of curcumin limit its clinical translational purposes. These issues can be circumvented effectively by nano-drug delivery systems that can target atherosclerotic plaque sites. In this work, we chose to use curcumin and a natural bioenhancer called Bioperine (derived from Piper nigrum) inside a polymeric nano-drug delivery system for targeting atherosclerotic plaque sites. We selected two different ratios of curcumin:Bioperine to study its comparative effect on the inhibition of oxidized low-density lipoprotein (Ox-LDL)-induced foam cell formation. Our studies demonstrated that Cur-Bio PLGA NPs (both ratios) maintained the cell viability in THP-1 monocyte-derived macrophages above 80% at all periods. The 1:0.2:10 ratio of Cur-Bio PLGA NPs at a concentration of 250 μg/mL illustrated an enhanced reduction in the relative cholesterol content in the THP-1-derived foam cells compared to the 1:1:10 ratio. Confocal microscopy analysis also revealed a reduction in macrophage-mediated foam cell formation when administered with both the ratios of Cur-Bio PLGA NPs. Relative fold change in the mRNA expression of the genes involved in the inflammatory pathways in the atherosclerotic process downregulated NF-κB, CCL2/MCP-1, CD-36, and STAT-3 activity while upregulating the SCAR-B1 expression when treated with the Cur-Bio PLGA NPs. This study thus highlights the importance of natural-based compounds towards the therapeutic intervention against atherosclerotic activity when administered as preventive medicine.
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Affiliation(s)
- Sindhu C. Pillai
- Bio-Nano Electronics Research Centre, Graduate School of Interdisciplinary Science, Toyo University, 2100, Kujirai, Saitama, Kawagoe 350-8585, Japan; (S.C.P.); (A.B.)
| | - Ankita Borah
- Bio-Nano Electronics Research Centre, Graduate School of Interdisciplinary Science, Toyo University, 2100, Kujirai, Saitama, Kawagoe 350-8585, Japan; (S.C.P.); (A.B.)
| | - Minh Nguyen Tuyet Le
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto 606-8302, Japan; (M.N.T.L.); (H.K.); (K.H.)
| | - Hiroaki Kawano
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto 606-8302, Japan; (M.N.T.L.); (H.K.); (K.H.)
| | - Kouichi Hasegawa
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto 606-8302, Japan; (M.N.T.L.); (H.K.); (K.H.)
| | - D. Sakthi Kumar
- Bio-Nano Electronics Research Centre, Graduate School of Interdisciplinary Science, Toyo University, 2100, Kujirai, Saitama, Kawagoe 350-8585, Japan; (S.C.P.); (A.B.)
- Correspondence: ; Tel.: +81-(0)492-39-1636/1375 or +81-(0)90-9964-7605; Fax: +81-(0)366-77-1140
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Paulo F, Santos L. Encapsulation of the Antioxidant Tyrosol and Characterization of Loaded Microparticles: an Integrative Approach on the Study of the Polymer-Carriers and Loading Contents. FOOD BIOPROCESS TECH 2020. [DOI: 10.1007/s11947-020-02407-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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8
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pH-sensitive core-shell electrospun nanofibers based on polyvinyl alcohol/polycaprolactone as a potential drug delivery system for the chemotherapy against cervical cancer. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2019.101455] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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9
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Pentamidine-Loaded Lipid and Polymer Nanocarriers as Tunable Anticancer Drug Delivery Systems. J Pharm Sci 2019; 109:1297-1302. [PMID: 31751563 DOI: 10.1016/j.xphs.2019.11.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 10/01/2019] [Accepted: 11/12/2019] [Indexed: 11/21/2022]
Abstract
Initially developed as a synthetic analogue of insulin, pentamidine (PTM) is an antimicrobial drug that has recently shown in vitro and in vivo anticancer activity. Nevertheless, systemic administration of PTM causes severe side effects, especially nephrotoxicity. Here we propose the association of PTM to different biocompatible nanosystems in order to compare the physicochemical characteristics of the loaded nanocarriers and their influence on the drug cytotoxicity toward cancer cells. In particular, PTM (as free base or with different counterions) was encapsulated into liposomes and poly(lactide-co-glycolide) (PLGA) nanoparticles and all the formulations have been deeply characterized concerning mean diameter, polydispersity index, zeta potential, stability, morphology, PTM loading, and drug release profile. The anticancer activity was evaluated on a human ovarian cancer cell line over 72 h. Results showed that PTM is efficiently loaded into liposomes with a transmembrane citrate or sulfate gradient; concerning PLGA nanoparticles, important association occurred, thanks to ionic interactions between the drug and the polymer. The in vitro studies confirmed the anticancer activity of PTM, which was gradually released with different profiles depending on the drug form and the nanocarrier structure.
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10
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Chakroun RW, Wang F, Lin R, Wang Y, Su H, Pompa D, Cui H. Fine-Tuning the Linear Release Rate of Paclitaxel-Bearing Supramolecular Filament Hydrogels through Molecular Engineering. ACS NANO 2019; 13:7780-7790. [PMID: 31117370 DOI: 10.1021/acsnano.9b01689] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
One key design feature in the development of any local drug delivery system is the controlled release of therapeutic agents over a certain period of time. In this context, we report the characteristic feature of a supramolecular filament hydrogel system that enables a linear and sustainable drug release over the period of several months. Through covalent linkage with a short peptide sequence, we are able to convert an anticancer drug, paclitaxel (PTX), to a class of prodrug hydrogelators with varying critical gelation concentrations. These self-assembling PTX prodrugs associate into filamentous nanostructures in aqueous conditions and consequently percolate into a supramolecular filament network in the presence of appropriate counterions. The intriguing linear drug release profile is rooted in the supramolecular nature of the self-assembling filaments which maintain a constant monomer concentration at the gelation conditions. We found that molecular engineering of the prodrug design, such as varying the number of oppositely charged amino acids or through the incorporation of hydrophobic segments, allows for the fine-tuning of the PTX linear release rate. In cell studies, these PTX prodrugs can exert effective cytotoxicity against glioblastoma cell lines and also primary brain cancer cells derived from patients and show enhanced tumor penetration in a cancer spheroid model. We believe this drug-bearing hydrogel platform offers an exciting opportunity for the local treatment of human diseases.
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Affiliation(s)
- Rami W Chakroun
- Department of Chemical and Biomolecular Engineering, and Institute for NanoBiotechnology , The Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States
| | - Feihu Wang
- Department of Chemical and Biomolecular Engineering, and Institute for NanoBiotechnology , The Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States
| | - Ran Lin
- Department of Chemical and Biomolecular Engineering, and Institute for NanoBiotechnology , The Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States
| | - Yin Wang
- Department of Chemical and Biomolecular Engineering, and Institute for NanoBiotechnology , The Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States
| | - Hao Su
- Department of Chemical and Biomolecular Engineering, and Institute for NanoBiotechnology , The Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States
| | - Danielle Pompa
- Department of Biomedical Engineering , University of Utah , 201 Presidents Circle , Salt Lake City , Utah 84112 , United States
| | - Honggang Cui
- Department of Chemical and Biomolecular Engineering, and Institute for NanoBiotechnology , The Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States
- Department of Oncology and Sidney Kimmel Comprehensive Cancer Center , Johns Hopkins University School of Medicine , Baltimore , Maryland 21205 , United States
- Center for Nanomedicine, The Wilmer Eye Institute , Johns Hopkins University School of Medicine , 400 North Broadway , Baltimore , Maryland 21231 , United States
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11
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Inclusion of hydroxytyrosol in ethyl cellulose microparticles: In vitro release studies under digestion conditions. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2018.06.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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12
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Tomasetti L, Breunig M. Preventing Obstructions of Nanosized Drug Delivery Systems by the Extracellular Matrix. Adv Healthc Mater 2018; 7. [PMID: 29121453 DOI: 10.1002/adhm.201700739] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 08/25/2017] [Indexed: 12/13/2022]
Abstract
Although nanosized drug delivery systems are promising tools for the treatment of severe diseases, the extracellular matrix (ECM) constitutes a major obstacle that endangers therapeutic success. Mobility of diffusing species is restricted not only by small pore size (down to as low as 3 nm) but also by electrostatic interactions with the network. This article evaluates commonly used in vitro models of ECM, analytical methods, and particle types with respect to their similarity to native conditions in the target tissue. In this cross-study evaluation, results from a wide variety of mobility studies are analyzed to discern general principles of particle-ECM interactions. For instance, cross-linked networks and a negative network charge are essential to reliably recapitulate key features of the native ECM. Commonly used ECM mimics comprised of one or two components can lead to mobility calculations which have low fidelity to in vivo results. In addition, analytical methods must be tailored to the properties of both the matrix and the diffusing species to deliver accurate results. Finally, nanoparticles must be sufficiently small to penetrate the matrix pores (ideally Rd/p < 0.5; d = particle diameter, p = pore size) and carry a neutral surface charge to avoid obstructions. Larger (Rd/p >> 1) or positively charged particles are trapped.
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Affiliation(s)
- Luise Tomasetti
- Department of Pharmaceutical Technology; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
| | - Miriam Breunig
- Department of Pharmaceutical Technology; University of Regensburg; Universitaetsstrasse 31 93040 Regensburg Germany
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Sonawane RO, Patil SD. Gelatin–κ-carrageenan polyelectrolyte complex hydrogel compositions for the design and development of extended-release pellets. INT J POLYM MATER PO 2017. [DOI: 10.1080/00914037.2016.1276060] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Raju Onkar Sonawane
- Department of Biopharmaceutics, H.R. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra, India
- Department of Pharmaceutics and Quality assurance, R.C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra, India
| | - Savita Dattatraya Patil
- Department of Biopharmaceutics, H.R. Patel Institute of Pharmaceutical Education and Research, Shirpur, Maharashtra, India
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Thatiparti TR, Juric D, von Recum HA. Pseudopolyrotaxane Formation in the Synthesis of Cyclodextrin Polymers: Effects on Drug Delivery, Mechanics, and Cell Compatibility. Bioconjug Chem 2017; 28:1048-1058. [DOI: 10.1021/acs.bioconjchem.6b00721] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thimma R. Thatiparti
- Department of Biomedical
Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Dajan Juric
- Department of Biomedical
Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Horst A. von Recum
- Department of Biomedical
Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
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Abstract
Many diseases that were considered major affliction of mankind in the past have been successfully eradicated with introduction of appropriate vaccine strategies. In order to expedite new challenges coming up to deal with various infectious diseases, nano-particulate-based subunit vaccines seem to be the demand of ordeal. The nano-vaccines can find better scope for the diseases that were not rampant in the semi-advanced world few years back. For example in present-day circumstances that corroborate with advancement in the field of medical sciences in terms of cancer chemotherapy, organ transplantation, therapy of autoimmune diseases, etc.; along with prevalence of altogether unheard diseases such as HIV infection, people are at risk of infliction with many more pathogens. In this regard, development of an effective prophylactic strategy against many opportunistic infections primarily caused by fungal pathogens needs better understanding of host pathogen relation and role of active immunity against pathogenic fungi. In the present study, we have tried to decipher effectiveness of a nano-sized vaccine delivery system in imparting protection against fungal pathogens.
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Affiliation(s)
- Swaleha Zubair
- Women's College, Aligarh Muslim University (AMU), Aligarh, Uttar Pradesh, 202002, India
| | - Asim Azhar
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University (AMU), Aligarh, Uttar Pradesh, 202002, India
| | - Nazoora Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University (AMU), Aligarh, Uttar Pradesh, 202002, India
| | - Ejaj Ahmad
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University (AMU), Aligarh, Uttar Pradesh, 202002, India
| | - Mohd Ajmal
- Department of Anatomy, JNMC, Aligarh Muslim University (AMU), Aligarh, India
| | - Mohammad Owais
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University (AMU), Aligarh, Uttar Pradesh, 202002, India.
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Yang JM, Yang JH, Tsou SC, Ding CH, Hsu CC, Yang KC, Yang CC, Chen KS, Chen SW, Wang JS. Cell proliferation on PVA/sodium alginate and PVA/poly(γ-glutamic acid) electrospun fiber. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 66:170-177. [DOI: 10.1016/j.msec.2016.04.068] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 03/29/2016] [Accepted: 04/18/2016] [Indexed: 01/12/2023]
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17
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Amini-Fazl MS, Mobedi H, Barzin J. Incorporation of HSA Microparticles Within the Taxol-Loaded In Situ Forming PLGA Microspheres: Synthesis, Characterization, and Drug Release. INT J POLYM MATER PO 2014. [DOI: 10.1080/00914037.2013.854237] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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18
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Loca D, Sevostjanovs E, Makrecka M, Zharkova-Malkova O, Berzina-Cimdina L, Tupureina V, Sokolova M. Microencapsulation of mildronate in biodegradable and non-biodegradable polymers. J Microencapsul 2013; 31:246-53. [DOI: 10.3109/02652048.2013.834992] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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19
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Basu S, Mukherjee B, Chowdhury SR, Paul P, Choudhury R, Kumar A, Mondal L, Hossain CM, Maji R. Colloidal gold-loaded, biodegradable, polymer-based stavudine nanoparticle uptake by macrophages: an in vitro study. Int J Nanomedicine 2012; 7:6049-61. [PMID: 23271908 PMCID: PMC3526149 DOI: 10.2147/ijn.s38013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE We describe the development, evaluation, and comparison of colloidal gold-loaded, poly(d,l-lactic-co-glycolic acid)-based nanoparticles containing anti-acquired immunodeficiency syndrome drug stavudine and uptake of these nanoparticles by macrophages in vitro. METHODS WE USED THE FOLLOWING METHODS IN THIS STUDY: drug-excipient interaction by Fourier transform infrared spectroscopy, morphology of nanoparticles by field-emission scanning electron microscopy, particle size by a particle size analyzer, and zeta potential and polydispersity index by a zetasizer. Drug loading and in vitro release were evaluated for formulations. The best formulation was incorporated with fluorescein isothiocyanate. Macrophage uptake of fluorescein isothiocyanate nanoparticles was studied in vitro. RESULTS Variations in process parameters, such as speed of homogenization and amount of excipients, affected drug loading and the polydispersity index. We found that the drug was released for a prolonged period (over 63 days) from the nanoparticles, and observed cellular uptake of stavudine nanoparticles by macrophages. CONCLUSION Experimental nanoparticles represent an interesting carrier system for the transport of stavudine to macrophages, providing reduced required drug dose and improved drug delivery to macrophages over an extended period. The presence of colloidal gold in the particles decreased the drug content and resulted in comparatively faster drug release.
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Affiliation(s)
- Sumit Basu
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
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Gongalsky MB, Kharin AY, Osminkina LA, Timoshenko VY, Jeong J, Lee H, Chung BH. Enhanced photoluminescence of porous silicon nanoparticles coated by bioresorbable polymers. NANOSCALE RESEARCH LETTERS 2012; 7:446. [PMID: 22873790 PMCID: PMC3464699 DOI: 10.1186/1556-276x-7-446] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Accepted: 07/11/2012] [Indexed: 05/29/2023]
Abstract
A significant enhancement of the photoluminescence (PL) efficiency is observed for aqueous suspensions of porous silicon nanoparticles (PSiNPs) coated by bioresorbable polymers, i.e., polylactic-co-glycolic acid (PLGA) and polyvinyl alcohol (PVA). PSiNPs with average size about 100 nm prepared by mechanical grinding of electrochemically etched porous silicon were dispersed in water to prepare the stable suspension. The inner hydrophobic PLGA layer prevents the PSiNPs from the dissolution in water, while the outer PVA layer makes the PSiNPs hydrophilic. The PL quantum yield of PLGA/PVA-coated PSiNPs was found to increase by three times for 2 weeks of the storage in water. The observed effect is explained by taking into account both suppression of the dissolution of PSiNPs in water and a process of the passivation of nonradiative defects in PSiNPs. The obtained results are interesting in view of the potential applications of PSiNPs in bioimaging.
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Affiliation(s)
- Maxim B Gongalsky
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia
| | - Alexander Yu Kharin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia
| | - Liubov A Osminkina
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia
| | - Victor Yu Timoshenko
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia
| | - Jinyoung Jeong
- Major in Nanobioengineering, University of Science and Technology, Daejeon, 305-806, South Korea
- BioNanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, 125 Gwahangno Yuseong, Daejeon, 305-806, South Korea
| | - Han Lee
- Major in Nanobioengineering, University of Science and Technology, Daejeon, 305-806, South Korea
- BioNanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, 125 Gwahangno Yuseong, Daejeon, 305-806, South Korea
| | - Bong Hyun Chung
- Major in Nanobioengineering, University of Science and Technology, Daejeon, 305-806, South Korea
- BioNanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, 125 Gwahangno Yuseong, Daejeon, 305-806, South Korea
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Khung YL, Li Lee W, Chui KL, Liu Y, Lim MP, Huang CL, Loo SCJ. Microencapsulation of dye- and drug-loaded particles for imaging and controlled release of multiple drugs. Adv Healthc Mater 2012. [PMID: 23184718 DOI: 10.1002/adhm.201100007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A polymeric microcapsule that can house different drug-loaded particles using a simple emulsion packaging technique is presented. Compared to the neat microparticles, microcapsules simultaneously release multiple drugs in a sustained manner. These microcapsules could provide a means of controlling release of multiple drugs.
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Affiliation(s)
- Yit-Lung Khung
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
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Lu TL, Sun WG, Zhao W, Chen T. Preparation of amifostine polylactide-co-glycolide microspheres and its irradiation protective to mouse through oral administration. Drug Dev Ind Pharm 2011; 37:1473-80. [DOI: 10.3109/03639045.2011.587429] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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de Sousa FO, Blanco-Méndez J, Pérez-Estévez A, Seoane-Prado R, Luzardo-Álvarez A. Effect of zein on biodegradable inserts for the delivery of tetracycline within periodontal pockets. J Biomater Appl 2011; 27:187-200. [DOI: 10.1177/0885328211398968] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Treatment with antibiotics within the periodontal pocket against bacterial infections represents a useful and adjunctive tool to conventional therapy for healing and teeth preservation. With this function in view, an implantable, tetracycline delivery device for the treatment of periodontal disease was developed. The aim of this study was to develop biodegradable, tetracycline-loaded microparticles made of two polymers: PLGA and zein which were compressed into monolithic devices. In this polymer delivery system, the encapsulation efficiency, release characteristics, drug–polymer interaction, and antibacterial activity of loaded drug were investigated. The interaction of tetracycline with the corn protein zein was studied by nuclear magnetic resonance (NMR), Fourier transform infrared, and X-ray diffraction. The hydrophobic interaction of tetracycline with zein in the formulations was deduced from the NMR studies, whereas X-ray diffraction studies showed a new crystalline state of the drug in the presence of the protein. Zein was not denatured by preparation of inserts. Sustained release of tetracycline was obtained, and the proportion of zein in the inserts had a great impact on the drug release. Finally, an effective tetracycline release from inserts against Staphylococcus aureus was achieved over 30 days. In conclusion, the PLGA:zein delivery system described in this study was found to be effective in controlled delivery of tetracycline, and hence may be suitable for intra-pocket delivery of antimicrobial agents in the treatment of periodontitis.
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Affiliation(s)
- Fábio Oliveira de Sousa
- The Capes Foundation, Ministry of Education of Brazil, Cx. Postal 365, Brasília DF 70359-970, Brazil
| | - Jose Blanco-Méndez
- Department of Pharmacy and Pharmaceutical Technology, School of Sciences, University of Santiago de Compostela, Avda. Alfonso X el Sabio s/n, 27002, Lugo, Spain
| | - Antonio Pérez-Estévez
- Departament of Microbiology and Parasitology, Medical School, University of Santiago de Compostela, R/ de San Francisco, s/n, 15782, Santiago de Compostela, Spain
| | - Rafael Seoane-Prado
- Departament of Microbiology and Parasitology, Medical School, University of Santiago de Compostela, R/ de San Francisco, s/n, 15782, Santiago de Compostela, Spain
| | - Asteria Luzardo-Álvarez
- Department of Pharmacy and Pharmaceutical Technology, School of Sciences, University of Santiago de Compostela, Avda. Alfonso X el Sabio s/n, 27002, Lugo, Spain
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Rabinovich M, Somayaji SN, Raghavan Pillai R, Hudson MC, Ellington JK, Bosse M, Horton J, Gonsalves KE. Active Polymer Nanoparticles: Delivery of Antibiotics. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-1019-ff05-06] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractAntibiotic-encapsulated PLA and PLGA nanoparticles were prepared by the single emulsion-solvent evaporation technique. Different PLA and PLGA systems were prepared, varying the copolymer composition and the amount of the surfactant polyvinyl alcohol. Characterization and drug loading studies were performed by UV-Visible spectrophotometry, dynamic light scattering, and scanning electron microscopy (SEM).Simultaneously, in order to model the diffusion of the nanoparticles within the osteoblast, QDs such as functionalized InGaP/ZnS and polymer encapsulated InGaP/ZnS nanoparticles were added to confluent cultures of primary mouse osteoblasts. Following PreFer fixation, cultures were examined via confocal microscopy. QDs were clearly visible within osteoblasts.
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Sousa FFO, Luzardo-Alvarez A, Pérez-Estévéz A, Seoane-Prado R, Blanco-Méndez J. Development of a novel AMX-loaded PLGA/zein microsphere for root canal disinfection. Biomed Mater 2010; 5:055008. [PMID: 20844319 DOI: 10.1088/1748-6041/5/5/055008] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The aim of this study was to develop polymeric biodegradable microspheres (MSs) of poly(D-L lactide-co-glycolide) (PLGA) and zein capable of delivering amoxicillin (AMX) at significant levels for root canal disinfection. PLGA/zein MSs were prepared using a spray-drying technique. The systems were characterized in terms of particle size, morphology, drug loading and in vitro release. Drug levels were reached to be effective during the intracanal dressing in between visits during the endodontic treatment. In vitro release studies were carried out to understand the release profile of the MSs. Antimicrobial activity of AMX was performed by antibiograms. Enterococcus faecalis was the bacteria selected due to its prevalence in endodontic failure. Drug microencapsulation yielded MSs with spherical morphology and an average particle size of between 5 and 38 µm. Different drug-release patterns were obtained among the formulations. Release features related to the MSs were strongly dependent on drug nature as it was demonstrated by using a hydrophobic drug (indomethacin). Finally, AMX-loaded MSs were efficient against E faecalis as demonstrated by the antibiogram results. In conclusion, PLGA/zein MSs prepared by spray drying may be a useful drug delivery system for root canal disinfection.
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Affiliation(s)
- F F O Sousa
- The Capes Foundation, Ministry of Education of Brazil, Cx. Postal 365, Brasília DF 70359-970, Brazil.
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Xu J, Li X, Sun F, Cao P. PVA hydrogels containing beta-cyclodextrin for enhanced loading and sustained release of ocular therapeutics. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 21:1023-38. [PMID: 20507706 DOI: 10.1163/156856209x463690] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The purpose of this work is to develop poly(vinyl alcohol) (PVA) hydrogels incorporating large amounts of beta-cyclodextrin (beta-CD) in order to improve ocular drug loading and to sustain drug release. First, the mono-methacrylated-beta-CD monomer (MA-beta-CD) and the methacrylated-PVA macromer (PVAMA), with a substitution degree of 7%, are synthesized and characterized. Then, the poly(methacrylated-PVA-co-mono-methacrylated-beta-cyclodextrin) (pPVA-beta-CD) hydrogels are prepared by UV-induced polymerization of MA-beta-CD and PVAMA. The highest amount of beta-CD incorporated into the hydrogels is 30 wt%. The hydrogels are further characterized by transmittance, FT-IR, equilibrium swelling ratio (ESR), tensile tests and protein deposition. The results show that pPVA-beta-CD hydrogels possess good transmittance, while the incorporation of beta-CD in the hydrogels improves the tensile strength and decreases the ESR and protein deposition. Finally, puerarin and acetazolamide are used as models to evaluate the drug loading and in vitro release behavior of the pPVA-beta-CD hydrogels. The results indicate that the amount of drug loaded into the pPVA-beta-CD hydrogels progressively increases, while the release rate decreases with increasing beta-CD content. In particular, incorporation of beta-CD efficiently decreases the initial burst release of acetazolamide, while the release, which is almost linear, is sustained for 15 days. The pPVA-beta-CD hydrogels have potential applications as biomedical devices for sustained release of ocular drugs.
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Affiliation(s)
- Jinku Xu
- Biomaterials and Drug Delivery Laboratories, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
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27
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Pamujula S, Graves RA, Moiseyev R, Bostanian LA, Kishore V, Mandal TK. Preparation of polylactide-co-glycolide and chitosan hybrid microcapsules of amifostine using coaxial ultrasonic atomizer with solvent evaporation. J Pharm Pharmacol 2010; 60:283-9. [DOI: 10.1211/jpp.60.3.0002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Abstract
The objective of this study was to evaluate the effect of various processing and formulation factors on the characteristics of amifostine hybrid microcapsules. Amifostine-loaded hybrid microcapsules were prepared using PLGA and chitosan. In short, amifostine powder was dissolved in de-aerated water with or without chitosan. The amifostine solution was later emulsified into PLGA solution in dichloromethane containing phosphatidylcholine. The resultant emulsion was fed through the inner capillary of a coaxial ultrasonic atomizer. The liquid fed through the coaxial outer capillary was either water or chitosan solution. The atomized droplets were collected into PVA solution and the droplets formed microcapsules immediately. The hybrid microcapsules prepared with chitosan solution only as an outer layer liquid showed the maximum efficiency of encapsulation (30%). The median sizes of all three formulations were 33–44 μm. These formulations with chitosan showed positive zeta-potential and sustained drug release with 13–45% amifostine released in 24 h. When chitosan was incorporated into inner as well as outer liquid layers, the drug release increased significantly, 45% (compared with other formulations) released in 24 h and almost 100% released in 11 days. Hybrid microcapsules of amifostine showed moderately high efficiency of encapsulation. The cationic charge (due to the presence of chitosan) of these particles is expected to favour oral absorption and thus overall bioavailability of orally administered amifostine.
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Affiliation(s)
- Sarala Pamujula
- College of Pharmacy, Xavier University of Louisiana, New Orleans, Louisiana 70125, USA
| | - Richard A Graves
- College of Pharmacy, Xavier University of Louisiana, New Orleans, Louisiana 70125, USA
| | - Raisa Moiseyev
- College of Pharmacy, Xavier University of Louisiana, New Orleans, Louisiana 70125, USA
| | - Levon A Bostanian
- College of Pharmacy, Xavier University of Louisiana, New Orleans, Louisiana 70125, USA
| | - Vimal Kishore
- College of Pharmacy, Xavier University of Louisiana, New Orleans, Louisiana 70125, USA
| | - Tarun K Mandal
- College of Pharmacy, Xavier University of Louisiana, New Orleans, Louisiana 70125, USA
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28
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McInnes SJ, Thissen H, Choudhury NR, Voelcker NH. New biodegradable materials produced by ring opening polymerisation of poly(l-lactide) on porous silicon substrates. J Colloid Interface Sci 2009; 332:336-44. [DOI: 10.1016/j.jcis.2008.12.073] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2008] [Revised: 12/24/2008] [Accepted: 12/27/2008] [Indexed: 10/21/2022]
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29
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Martini G, Ciani L. Electron spin resonance spectroscopy in drug delivery. Phys Chem Chem Phys 2009; 11:211-54. [DOI: 10.1039/b808263d] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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The intracellular uptake ability of chitosan-coated Poly (D,L-lactideco-glycolide) nanoparticles. Arch Pharm Res 2008; 31:1050-4. [DOI: 10.1007/s12272-001-1267-5] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Revised: 06/18/2008] [Accepted: 06/20/2008] [Indexed: 11/25/2022]
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31
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Pillai RR, Somayaji SN, Rabinovich M, Hudson MC, Gonsalves KE. Nafcillin-loaded PLGA nanoparticles for treatment of osteomyelitis. Biomed Mater 2008; 3:034114. [DOI: 10.1088/1748-6041/3/3/034114] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hasan AS, Socha M, Lamprecht A, Ghazouani FE, Sapin A, Hoffman M, Maincent P, Ubrich N. Effect of the microencapsulation of nanoparticles on the reduction of burst release. Int J Pharm 2007; 344:53-61. [PMID: 17643878 DOI: 10.1016/j.ijpharm.2007.05.066] [Citation(s) in RCA: 129] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Revised: 05/27/2007] [Accepted: 05/29/2007] [Indexed: 11/18/2022]
Abstract
The initial burst release is one of the major problems in the development of controlled release formulations including drug-loaded micro- and nanoparticles, especially with low molecular weight drugs. The objective of the present work was to encapsulate, by the W/O/W emulsion, polymeric nanoparticles into polymeric microparticles by using non-water soluble polymers and appropriate organic solvents for the preparation of these composite microparticles. They were characterized in vitro (encapsulation efficiency, mean diameter and release kinetics) and compared with nanoparticles and classical microparticles prepared by the same method. Poly-epsilon-caprolactone (PCL) dissolved in methylene chloride was used to make nanoparticles, whereas ethylcellulose and Eudragit RS dissolved in ethyl acetate, a non-solvent of poly-epsilon-caprolactone, were used for the preparation of microparticles. Ibuprofen and triptorelin acetate were chosen as lipophilic and hydrophilic model drugs, respectively. High entrapment efficiencies were obtained with ibuprofen whereas lower amounts of triptorelin acetate were encapsulated, mainly with formulations prepared with poly-epsilon-caprolactone and Eudragit RS used alone or blended with ethylcellulose. The burst was significantly lower with composite microparticles and may be explained by the slower diffusion of the drugs through the double polymeric wall formed by the nanoparticle matrix followed by another diffusion step through the microparticle polymeric wall.
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Affiliation(s)
- A Sheikh Hasan
- EA 3452-Inserm U 734, School of Pharmacy-5, rue A. Lebrun, BP 80403, 54001 Nancy Cedex, France
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Lavergne FM, Cot D, Ganachaud F. Polymer microcapsules with "foamed" membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:6744-53. [PMID: 17451258 DOI: 10.1021/la070149p] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
This article describes the preparation of capsules displaying craters at their surfaces and independent holes inside their membranes. These poly(methylmethacrylate) capsules of 20 to 200 microm diameter are prepared by a solvent evaporation process and typically contain a dispersant, polyvinyl alcohol, and an excipient, namely, a fatty acid triglyceride (miglyol 812). Spectroscopic methods showed that, depending on the miglyol content, the craters at the surface exhibited sizes of about 1 to 2 microm, whereas the core structure of the membrane changed significantly, typically from "soft-part-of-bread" up to "foamed"-like aspects. Among several spectroscopy techniques, confocal fluorescence microscopy confirmed that the capsules retained the miglyol in their core and not in the craters or holes, even after centrifugation and handling. This technique also showed that holes in the membrane are filled with water. A possible analysis of the "foaming" phenomenon based on the surface tensions of different oils, as well as their optimal hydrophile-lipophile balance (HLBO), is added to generalize the concept.
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Affiliation(s)
- Fleur-Marie Lavergne
- Institut Charles Gerhardt, UMR5253 CNRS/UM2/ENSCM/UM1, 8 Rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France
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Mangiapia G, Ricciardi R, Auriemma F, Rosa CD, Celso FL, Triolo R, Heenan RK, Radulescu A, Tedeschi AM, D'Errico G, Paduano L. Mesoscopic and Microscopic Investigation on Poly(vinyl alcohol) Hydrogels in the Presence of Sodium Decylsulfate. J Phys Chem B 2007; 111:2166-73. [PMID: 17295534 DOI: 10.1021/jp0663107] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structure of poly(vinyl alcohol) (PVA) hydrogels formed as a result of freeze/thaw treatments of aqueous solutions of the polymer (11 wt % PVA) in the freshly prepared state is analyzed through the combined use of small (SANS) and ultrasmall (USANS) angle neutron scattering techniques. The structure of these hydrogels may be described in terms of polymer rich regions, with dimensions of the order of 1-2 microm, dispersed in a water rich phase, forming two bicontinuous phases. The PVA chains in the polymer rich phase form a network where the cross-linking points are mainly crystalline aggregates of PVA having average dimensions of approximately 45 A. The structural organization of freeze/thaw PVA hydrogel membranes does not change either after rehydration of dried gels or in the presence of a tensile force. Finally, addition of surfactant micelles inside the gel provides a formulation with both hydrophobic and hydrophilic regions, which demonstrates the potential of the system for drug delivery. Both SANS and EPR measurements show that sodium decylsulfate (C10OS) micelles do not significantly interact with the PVA gel. Variation of the gel structure by the number of freeze/thaw cycles should modulate the rate of release of an active constituent, for example, in a dermal patch.
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Affiliation(s)
- Gaetano Mangiapia
- Dipartimento di Chimica, Complesso Universitario di M. S. Angelo, Università degli Studi di Napoli "Federico II", Via Cinthia, 80126 Napoli (NA), Italy
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Patachia S, Valente AJ, Baciu C. Effect of non-associated electrolyte solutions on the behaviour of poly(vinyl alcohol)-based hydrogels. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2006.11.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Lin CC, Metters AT. Hydrogels in controlled release formulations: network design and mathematical modeling. Adv Drug Deliv Rev 2006; 58:1379-408. [PMID: 17081649 DOI: 10.1016/j.addr.2006.09.004] [Citation(s) in RCA: 1040] [Impact Index Per Article: 57.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2006] [Accepted: 09/04/2006] [Indexed: 10/24/2022]
Abstract
Over the past few decades, advances in hydrogel technologies have spurred development in many biomedical applications including controlled drug delivery. Many novel hydrogel-based delivery matrices have been designed and fabricated to fulfill the ever-increasing needs of the pharmaceutical and medical fields. Mathematical modeling plays an important role in facilitating hydrogel network design by identifying key parameters and molecule release mechanisms. The objective of this article is to review the fundamentals and recent advances in hydrogel network design as well as mathematical modeling approaches related to controlled molecule release from hydrogels. In the first section, the niche roles of hydrogels in controlled release, molecule release mechanisms, and hydrogel design criteria for controlled release applications are discussed. Novel hydrogel systems for drug delivery including biodegradable, smart, and biomimetic hydrogels are reviewed in the second section. Several mechanisms have been elucidated to describe molecule release from polymer hydrogel systems including diffusion, swelling, and chemically-controlled release. The focus of the final part of this article is discussion of emerging hydrogel delivery systems and challenges associated with modeling the performance of these devices.
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Affiliation(s)
- Chien-Chi Lin
- Department of Bioengineering, Clemson University, Clemson, SC 29634, USA
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Tedeschi A, Auriemma F, Ricciardi R, Mangiapia G, Trifuoggi M, Franco L, Rosa CD, Heenan RK, Paduano L, D'Errico G. A Study of the Microstructural and Diffusion Properties of Poly(vinyl alcohol) Cryogels Containing Surfactant Supramolecular Aggregates. J Phys Chem B 2006; 110:23031-40. [PMID: 17107141 DOI: 10.1021/jp061941m] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Surfactant-containing poly(vinyl alcohol) (PVA) cryogels have been prepared by drying and reswelling hydrogel patches, previously obtained by the freeze/thaw procedure, in decyltrimethylammonium bromide (C10TAB) aqueous solutions. The microstructural and diffusive properties of the resulting material have been characterized by a combined experimental strategy. Gravimetric measurements show that the cryogel maximum swelling is not affected by the surfactant. The surfactant concentration within the cryogel, measured by ion chromatography, is the same as that in the rehydrating surfactant solution. Electron paramagnetic resonance (EPR) spin-probe and small-angle neutron scattering (SANS) measurements show that surfactant self-aggregation in the gel is similar to that in water, occurring at the same critical concentration and resulting in the formation of micellar aggregates whose structure is not affected by the cryogel polymeric scaffold. However, both the micelle intradiffusion coefficients, measured by PGSE-NMR, and the spin-probe correlation times, measured by EPR, indicate that dynamic processes in the hydrogel are much slower than in bulk water. A quantitative analysis of these results suggests that the cryogel polymer-poor domains, in which surfactant molecules are solubilized, have an average dimension of approximately 0.1 microm. Interestingly the experimental data also show that the polymer-poor phase contains more polymer than expected, suggesting that the spinodal decomposition, which occurs during the freezing step of cryogel preparation, is not complete or prevented by ice formation.
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Affiliation(s)
- Annamaria Tedeschi
- Università di Napoli "Federico II", Dipartimento di Chimica, Via Cintia, I-80126 Napoli, Italy
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Bouissou C, Rouse JJ, Price R, van der Walle CF. The Influence of Surfactant on PLGA Microsphere Glass Transition and Water Sorption: Remodeling the Surface Morphology to Attenuate the Burst Release. Pharm Res 2006; 23:1295-305. [PMID: 16715359 DOI: 10.1007/s11095-006-0180-2] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2005] [Accepted: 02/06/2006] [Indexed: 10/24/2022]
Abstract
PURPOSE The stability of protein unloaded and loaded poly(lactic-co-glycolic acid) (PLGA) microspheres fabricated with surfactant was challenged through exposure to environmental conditions of different relative humidity. METHODS Polyvinyl alcohol (PVA) or Triton X-100 was added to the primary emulsion of the double-emulsion solvent evaporation technique. After storage at ambient humidity and 75% relative humidity, the mechanical stability of the polymer was tested to reveal PLGA chain mobility using differential scanning calorimetry. Subsequent surface modifications were examined by atomic force microscopy (AFM), and protein release profiles were collected. RESULTS Residual amounts of PVA and particularly Triton X-100 raised the hydrophilicity of the microspheres. When exposed to ambient humidity or 75% relative humidity, PVA and Triton X-100 had, respectively, an antiplasticizing and a plasticizing effect upon PLGA, and both led to physical aging. The high-resolution AFM imaging of microspheres containing model protein and Triton X-100 showed that the depth of the surface pores was reduced when exposed to 75% relative humidity, and the initial burst release subsequently decreased. CONCLUSION These studies suggested that the mechanical stability of PLGA was influenced by the addition of surfactants, which, depending on the formulation, led to surface pore remodeling under high humidity, reducing the initial burst release while maintaining the spherical integrity of the microsphere.
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Affiliation(s)
- C Bouissou
- Department of Pharmacy, University of Bath, Bath, BA2 7AY, UK
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Thote AJ, Chappell JT, Gupta RB, Kumar R. Reduction in the initial-burst release by surface crosslinking of PLGA microparticles containing hydrophilic or hydrophobic drugs. Drug Dev Ind Pharm 2005; 31:43-57. [PMID: 15704857 DOI: 10.1081/ddc-43985] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Sustained-release approaches are emerging for the delivery of drugs from polymer encapsulation. However, the most persistent problem that remains is the initial burst release of the drug, which can exceed the toxic limits. Dexamethasone, a hydrophobic drug, was encapsulated in poly(lactide-co-glycolide) (PLGA) microparticles using the solvent evaporation method. The drug release profile of these microparticles was studied and the initial burst was reduced by crosslinking of the microparticle surface using ethylene glycol dimethacrylate and tri(ethylene glycol) dimethacrylate. Due to surface crosslinking, an additional diffusional resistance was created, which prevented easy dissolution of the drug into the release medium and brought about a substantial reduction in the initial burst release. Moreover, the time required for reaching a stationary-state release was also observed to be delayed, prolonging the sustained drug delivery. This concept was further tested with a hydrophilic drug, the sodium salt of dexamethasone phosphate, encapsulated in PLGA polymer microparticles and was observed to reduce the burst release as well. For synthesizing the polymer microparticles containing dexamethasone, an o/w microemulsion and solvent evaporation technique was used; whereas, for those containing dexamethasone phosphate, w/o/o/o phase separation/coacervation technique was used. The surface crosslinking was performed by ultraviolet radiation.
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Affiliation(s)
- Amol J Thote
- Department of Chemical Engineering, Auburn University, AL 36849-5127, USA
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Leach WT, Simpson DT, Val TN, Anuta EC, Yu Z, Williams RO, Johnston KP. Uniform Encapsulation of Stable Protein Nanoparticles Produced by Spray Freezing for the Reduction of Burst Release. J Pharm Sci 2005; 94:56-69. [PMID: 15761930 DOI: 10.1002/jps.20209] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Stable protein nanostructured particles, produced by spray freezing into liquid (SFL) nitrogen, were encapsulated uniformly into microspheres to reduce the burst release over the first 24 h. The denaturation and aggregation of these bovine serum albumin (BSA) high-surface area particles were minimal due to ultra-rapid freezing and the absence of a liquid-air interface. Upon sonication, these friable highly porous, solid protein particle aggregates broke up into submicron particles. These particles were encapsulated into DL-lactide/glycolide copolymer (PLGA) and poly(lactic acid) (PLA) microspheres by anhydrous solid-in-oil-in-oil (s/o/o) techniques. For 5% loading of protein, the burst release after 24 h was only 2.5-4.1%, that is, values fivefold to tenfold lower than those observed for larger more conventional BSA particles. At a loading of 10%, the burst was only 6 and 13% for PLGA and PLA, respectively, and at 15% loading it was only 12% for PLGA. As shown with confocal and scanning electron microscopy (SEM), the low burst is consistent with a uniform distribution of protein nanoparticles, which were about 100 times smaller than the microspheres. Changes in aggregation and secondary structure, which were monitored by size exclusion chromatography and FTIR, respectively, indicated only slight monomer loss (3.9%) and high structural integrity (38% alpha-helix) in the encapsulated protein.
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Affiliation(s)
- W Thomas Leach
- Pharmaceutics Division, College of Pharmacy, The University of Texas at Austin, Austin, Texas 78712, USA
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Graves RA, Moiseyev R, Freeman T, Mandal TK. Effect of surfactant on the characteristics of biodegradable microcapsules. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2005; 16:585-96. [PMID: 16001718 DOI: 10.1163/1568562053783696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The objective of this project was to evaluate the effect of several lipophilic surfactants on the characteristics of PLGA microcapsules. BSA was used as a model peptide. Seven different lipophilic surfactants were used and each of the surfactants was used at three different concentrations, 0.1, 0.5 and 1% (w/w), respectively. The microcapsules were prepared using the double emulsion solvent evaporation technique. The microcapsules were all spherical in shape with a smooth surface. The median size of the microcapsules varied between 4 and 49 microm. The zeta potential of the microcapsules varied between -26 and -43 mV. The efficiency of encapsulation varied between 8 and 45%. Efficiency of encapsulation appears to be dependant on both the type and concentration of the surfactant. Cumulative percent of BSA released up to 35 days varied from 18 to 78%. In conclusion, the physical characteristics of the microcapsules do not appear to be greatly affected by the type of surfactant. All of the samples appear to show polydispersity in their particle sizes. Particle charge depended on both the type and concentration of the surfactant. The overall dissolution of these microcapsules was very slow.
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Affiliation(s)
- Richard A Graves
- College of Pharmacy, Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA 70125-1098, USA
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Pamujula S, Graves RA, Kishore V, Mandal TK. Preparation and in vitro characterization of amifostine biodegradable microcapsules. Eur J Pharm Biopharm 2004; 57:213-8. [PMID: 15018977 DOI: 10.1016/s0939-6411(03)00148-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2003] [Revised: 08/20/2003] [Accepted: 08/20/2003] [Indexed: 11/30/2022]
Abstract
The purpose of this project was to develop sustained release microcapsules of amifostine. The microcapsules were prepared using solvent evaporation technique. The effect of several formulation variables on the characteristics of the microcapsules was studied. The formulation variables studied were drug loading, polymer (polylactide-co-glycolide) (PLGA) concentration, and the amount of gelatin in the initial aqueous phase. The drug loading was studied at three different levels (5, 10, and 25 mg); the PLGA concentration was studied at two levels (500 and 1000 mg); and the amount of gelatin used ranged from 2 to 14 mg. In general, the microcapsules were less than 155 microm in diameter with median size between 50 and 80 microm. While the use of higher amounts of PLGA significantly increased the median size of the microcapsules, using higher amounts of amifostine had no significant effect, irrespective of the amount of PLGA. The use of gelatin, within the range 2-14 mg, did not show any significant effect on the particle size distribution. Scanning electron microscopy (SEM) of the microcapsules revealed that all nine formulations yielded spherical particles. The use of 500 mg PLGA with 10 or 25 mg amifostine yielded microcapsules with porous surfaces. The surface pores, however, were not present in microcapsules prepared using 1000 mg PLGA. The efficiency of encapsulation decreased significantly from 63 to 24% when the amount of amifostine increased from 5 to 25 mg in the formulations using 500 mg PLGA. Similarly, the efficiency of encapsulation decreased from 87 to 23% when the amount of PLGA was doubled to 1000 mg. An increase in the amount of amifostine in the formulation using 500 mg PLGA also resulted in a significant increase in initial drug release (from 20 to 62%) within the first hour. These results were consistent with the porous morphology of these microcapsules. In general, all batches of microcapsules showed 24-96 h sustained drug release.
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Affiliation(s)
- Sarala Pamujula
- College of Pharmacy, Xavier University of Louisiana, New Orleans, LA 70125-1098, USA
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