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Ganguly R, Chu JO, Lee CS, Choi CH. Solvent-Free Fabrication of Anisotropic Microparticles with Precise 3D Shape Control Using Dipping-Based Micromolding. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:5391-5400. [PMID: 38416015 DOI: 10.1021/acs.langmuir.3c03878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
We present an innovative solvent-free micromolding technique for rapidly fabricating complex polymer microparticles with three-dimensional (3D) shapes utilizing a surface tension-induced dipping process. Our fabrication process involves loading a photocurable solution into micromolds through mold dipping. The loaded solution, induced by surface tension, undergoes spatial deformation upon mold removal caused by surface forces, ultimately acquiring an anisotropic shape before photopolymerization. Results show that the amount of photocurable solution loaded depends on the degree of capillary penetration, which can be adjusted by varying the dipping time and mold height. It enables the production of polymer particles with precisely controlled 3D shapes without diluting them with volatile organic solvents. Sequential micromolding enables the spatial stacking of the polymer domain through a bottom-up approach, facilitating the creation of complex multicompartmental microparticles with independently controlled compartments. Finally, we demonstrated the successful simultaneous conjugation of multiple model-fluorescent proteins through the biofunctionalization of microparticles, indicating functional stability and effective conjugation of hydrophilic molecules such as proteins. We also extend our capacity to create bicompartmental microparticles with distinct functionalities in each compartment, revealing spatially controlled functional structures. In summary, these findings demonstrate a straightforward, rapid, and reliable method for producing highly uniform complex particles with precise control over the 3D shape and compartmentalization, all accomplished without the use of organic solvents.
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Affiliation(s)
- Reya Ganguly
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Jin-Ok Chu
- Division of Cosmetic Science and Technology, Daegu Haany University, 1 Haanydaero, Gyeongsan, Gyeongbuk 38610, Republic of Korea
| | - Chang-Soo Lee
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Chang-Hyung Choi
- School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea
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De R, Song YH, Mahata MK, Lee KT. pH-responsive polyelectrolyte complexation on upconversion nanoparticles: a multifunctional nanocarrier for protection, delivery, and 3D-imaging of therapeutic protein. J Mater Chem B 2022; 10:3420-3433. [PMID: 35389393 DOI: 10.1039/d2tb00246a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The delicate tertiary structure of proteins, their susceptibility to heat- and enzyme-induced irreversible denaturation, and their tendency to get accumulated at the cell membrane during uptake are daunting challenges in proteinaceous therapeutic delivery. Herein, a polyelectrolyte complex having encapsulated therapeutic protein has been designed on the surface of upconverting luminescent nanoparticles (NaYF4:20%Yb3+,2%Er3+). This nanosized complex system has been found to overcome the challenges of protein aggregation at the cell membrane. It has also defended the cargo from denaturation against (a) enzymatic action of proteinase K and (b) heat (up to 60 °C). Additionally, the nanoparticles at the core of the loaded carrier served as near-infrared (980 nm) responsive probe to accomplish extended-duration 3D imaging during protein delivery. The outer layer of polymer played pivotal role to protect/retrieve the protein structure from denaturation as investigated by circular dichroism studies. Both the masked surface-charges of protein and the nanoscale size of the loaded carrier have facilitated their efficient passage through the cell membrane as observed through 3D images/videos. This nanocarrier is the first of its kind for direct delivery of protein. Thus, the findings can be useful to protect and transport various proteinaceous materials to overcome challenges of accumulation at the cell-membrane and low-temperature storage, as nature does.
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Affiliation(s)
- Ranjit De
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, South Korea. .,Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
| | - Yo Han Song
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, South Korea.
| | - Manoj Kumar Mahata
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, South Korea. .,Drittes Physikalisches Institut - Biophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany
| | - Kang Taek Lee
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, South Korea.
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Ganguly R, Choi Y, Lee CS, Choi CH. Tuning three-dimensional (3D) shapes of polymeric microparticles by geometry-driven control of mold swelling and capillarity in micromolds. J Colloid Interface Sci 2021; 600:373-381. [PMID: 34023698 DOI: 10.1016/j.jcis.2021.05.045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/07/2021] [Accepted: 05/08/2021] [Indexed: 11/25/2022]
Abstract
We report a simple method for producing polymeric microparticles with controlled three-dimensional (3D) shapes from two-dimensional (2D) micromolds via mold geometry-mediated tunable mold swelling and capillarity. Specifically, the photocurable solution confined in the mold with diverse geometries is spatially deformed by the addition of the wetting fluid, which triggers the mold swelling and capillarity; this allows the production of highly uniform microparticles with complex shape via photopolymerization. The results show that the swelling-induced mold deflection is varied depending on the mold geometry with different side lengths, allowing a tunable deformation of the photocurable solution and forming non-spherical particles with a convex top. The capillarity of the wetting fluid is also determined by the mold geometry with different corner angles, leading to the directional movement of the photocurable solution via Laplace pressure-driven flow and facilitating the production of spherical particles with or without shape imprinting. Furthermore, we demonstrate a capability to further enhance the mold swelling by varying mold composition, expanding their controllability in 3D shape, and enabling simultaneous production of spherical and non-spherical particles using a single mold.
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Affiliation(s)
- Reya Ganguly
- Department of Chemical Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Yoon Choi
- Division of Cosmetic Science and Technology, Daegu Haany University, 1 Haanydaero, Gyeongsan-si, Gyeongsangbuk-do 38610, Republic of Korea
| | - Chang-Soo Lee
- Department of Chemical Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea.
| | - Chang-Hyung Choi
- Division of Cosmetic Science and Technology, Daegu Haany University, 1 Haanydaero, Gyeongsan-si, Gyeongsangbuk-do 38610, Republic of Korea.
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Porphyrin-xylan-coated silica nanoparticles for anticancer photodynamic therapy. Carbohydr Polym 2019; 213:168-175. [DOI: 10.1016/j.carbpol.2019.02.070] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 02/14/2019] [Accepted: 02/19/2019] [Indexed: 12/11/2022]
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Zhou C, Abdel-Rahman MA, Li W, Liu K, Zhang A. Thermoresponsive dendronized copolymers for protein recognitions based on biotin–avidin interaction. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2016.11.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Vocelle D, Chesniak OM, Malefyt AP, Comiskey G, Adu-Berchie K, Smith MR, Chan C, Walton SP. Dextran functionalization enhances nanoparticle-mediated siRNA delivery and silencing. TECHNOLOGY 2016; 4:42. [PMID: 27774502 PMCID: PMC5072529 DOI: 10.1142/s2339547816400100] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Understanding the endocytosis and intracellular trafficking of short interfering RNA (siRNA) delivery vehicle complexes remains a critical bottleneck in designing siRNA delivery vehicles for highly active RNA interference (RNAi)-based therapeutics. In this study, we show that dextran functionalization of silica nanoparticles enhanced uptake and intracellular delivery of siRNAs in cultured cells. Using pharmacological inhibitors for endocytotic pathways, we determined that our complexes are endocytosed via a previously unreported mechanism for siRNA delivery in which dextran initiates scavenger receptor-mediated endocytosis through a clathrin/caveolin-independent process. Our findings suggest that siRNA delivery efficiency could be enhanced by incorporating dextran into existing delivery platforms to activate scavenger receptor activity across a variety of target cell types.
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Affiliation(s)
- Daniel Vocelle
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824-1226, USA
| | - Olivia M Chesniak
- Department of Chemistry, Michigan State University, East Lansing, MI 48824-1226, USA
| | - Amanda P Malefyt
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824-1226, USA
| | - Georgina Comiskey
- Department of Chemistry, Michigan State University, East Lansing, MI 48824-1226, USA
| | - Kwasi Adu-Berchie
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824-1226, USA
| | - Milton R Smith
- Department of Chemistry, Michigan State University, East Lansing, MI 48824-1226, USA
| | - Christina Chan
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824-1226, USA; Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824-1226, USA
| | - S Patrick Walton
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824-1226, USA
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Byrne GD, Vllasaliu D, Falcone FH, Somekh MG, Stolnik S. Live Imaging of Cellular Internalization of Single Colloidal Particle by Combined Label-Free and Fluorescence Total Internal Reflection Microscopy. Mol Pharm 2015; 12:3862-70. [PMID: 26402436 DOI: 10.1021/acs.molpharmaceut.5b00215] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
In this work we utilize the combination of label-free total internal reflection microscopy and total internal reflectance fluorescence (TIRM/TIRF) microscopy to achieve a simultaneous, live imaging of single, label-free colloidal particle endocytosis by individual cells. The TIRM arm of the microscope enables label free imaging of the colloid and cell membrane features, while the TIRF arm images the dynamics of fluorescent-labeled clathrin (protein involved in endocytosis via clathrin pathway), expressed in transfected 3T3 fibroblasts cells. Using a model polymeric colloid and cells with a fluorescently tagged clathrin endocytosis pathway, we demonstrate that wide field TIRM/TIRF coimaging enables live visualization of the process of colloidal particle interaction with the labeled cell structure, which is valuable for discerning the membrane events and route of colloid internalization by the cell. We further show that 500 nm in diameter model polystyrene colloid associates with clathrin, prior to and during its cellular internalization. This association is not apparent with larger, 1 μm in diameter colloids, indicating an upper particle size limit for clathrin-mediated endocytosis.
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Affiliation(s)
- Gerard D Byrne
- Drug Delivery and Tissue Engineering Division, School of Pharmacy, University of Nottingham , Nottingham, NG7 2RD, U.K.,Institute of Biophysics, Imaging and Optical Science (IBIOS), School of Electrical and Electronic Engineering, University of Nottingham , Nottingham, NG7 2RD, U.K
| | - Driton Vllasaliu
- Drug Delivery and Tissue Engineering Division, School of Pharmacy, University of Nottingham , Nottingham, NG7 2RD, U.K
| | - Franco H Falcone
- Division of Molecular and Cellular Science, School of Pharmacy, University of Nottingham , Nottingham, NG7 2RD, U.K
| | - Michael G Somekh
- Institute of Biophysics, Imaging and Optical Science (IBIOS), School of Electrical and Electronic Engineering, University of Nottingham , Nottingham, NG7 2RD, U.K
| | - Snjezana Stolnik
- Drug Delivery and Tissue Engineering Division, School of Pharmacy, University of Nottingham , Nottingham, NG7 2RD, U.K
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Sharma S, Verma A, Teja BV, Pandey G, Mittapelly N, Trivedi R, Mishra PR. An insight into functionalized calcium based inorganic nanomaterials in biomedicine: Trends and transitions. Colloids Surf B Biointerfaces 2015; 133:120-39. [PMID: 26094145 DOI: 10.1016/j.colsurfb.2015.05.014] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 05/06/2015] [Accepted: 05/08/2015] [Indexed: 12/28/2022]
Abstract
Over the recent years the use of biocompatible and biodegradable nanoparticles in biomedicine has become a significant priority. Calcium based ceramic nanoparticles like calcium phosphate (CaP) and calcium carbonate (CaCO3) are therefore considered as attractive carriers as they are naturally present in human body with nanosize range. Their application in tissue engineering and localized controlled delivery of bioactives for bones and teeth is well established now, but recently their use has increased significantly as carrier of bioactives through other routes also. These delivery systems have become most potential alternatives to other commonly used delivery system because of their cost effectiveness, biodegradability, chemical stability, controlled and stimuli responsive behaviour. This review comprehensively covers their characteristic features, method of preparation and applications but the thrust is to focus their recent development, functionalization and use in systemic delivery. On the same platform mineralization of other nanoparticulate delivery system which has widened their application drug delivery will be discussed. The emphasis has been given on their pH dependent properties which make them excellent carriers for tumour targeting and intracellular delivery. Finally this review also attempts to discuss their drawback which limits their clinical utility.
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Affiliation(s)
- Shweta Sharma
- Division of Pharmaceutics, CSIR-Central Drug Research Institute, B 10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, U.P., India
| | - Ashwni Verma
- Division of Pharmaceutics, CSIR-Central Drug Research Institute, B 10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, U.P., India
| | - B Venkatesh Teja
- Division of Pharmaceutics, CSIR-Central Drug Research Institute, B 10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, U.P., India
| | - Gitu Pandey
- Division of Pharmaceutics, CSIR-Central Drug Research Institute, B 10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, U.P., India
| | - Naresh Mittapelly
- Division of Pharmaceutics, CSIR-Central Drug Research Institute, B 10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, U.P., India
| | - Ritu Trivedi
- Division of Endocrinology, CSIR-Central Drug Research Institute, B 10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, U.P., India
| | - P R Mishra
- Division of Pharmaceutics, CSIR-Central Drug Research Institute, B 10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, U.P., India.
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9
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A micro- and nano-structured drug carrier based on biocompatible, hybrid polymeric nanoparticles for potential application in dry powder inhalation therapy. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.06.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Sahib MN, Abdulameer SA, Darwis Y, Peh KK, Tan YTF. Solubilization of beclomethasone dipropionate in sterically stabilized phospholipid nanomicelles (SSMs): physicochemical and in vitro evaluations. DRUG DESIGN DEVELOPMENT AND THERAPY 2012; 6:29-42. [PMID: 22393583 PMCID: PMC3287410 DOI: 10.2147/dddt.s28265] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Background The local treatment of lung disorders such as asthma and chronic obstructive pulmonary disease via pulmonary drug delivery offers many advantages over oral or intravenous routes of administration. This is because direct deposition of a drug at the diseased site increases local drug concentrations, which improves the pulmonary receptor occupancy and reduces the overall dose required, therefore reducing the side effects that result from high drug doses. From a clinical point of view, although jet nebulizers have been used for aerosol delivery of water-soluble compounds and micronized suspensions, their use with hydrophobic drugs has been inadequate. Aim: To evaluate the feasibility of sterically stabilized phospholipid nanomicelles (SSMs) loaded with beclomethasone dipropionate (BDP) as a carrier for pulmonary delivery. Methods 1,2-Distearoyl-sn-glycero-3-phosphoethanolamine-N-methoxy-poly(ethylene glycol 5000) polymeric micelles containing BDP (BDP-SSMs) were prepared by the coprecipitation and reconstitution method, and the physicochemical and in vitro characteristics of BDP-SSMs were investigated. Results BDP-SSMs were successfully prepared with a content uniformity and reproducibility suitable for pulmonary administration. The maximum solubility of BDP in SSMs was approximately 1300 times its actual solubility. The particle size and zeta potential of BDP-SSMs were 19.89 ± 0.67 nm and −28.03 ± 2.05 mV, respectively. The SSMs system slowed down the release of BDP and all of the aerodynamic values of the aerosolized rehydrated BDP-SSMs were not only acceptable but indicated a significant level of deposition in the lungs. Conclusion The SSM system might be an effective way of improving the therapeutic index of nebulized, poorly soluble corticosteroids.
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Affiliation(s)
- Mohanad Naji Sahib
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia.
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Sahib MN, Darwis Y, Peh KK, Abdulameer SA, Fung Tan YT. Incorporation of Beclomethasone Dipropionate into Polyethylene Glycol-Diacyl Lipid Micelles as a Pulmonary Delivery System. Drug Dev Res 2012. [DOI: 10.1002/ddr.21000] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Mohanad Naji Sahib
- School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang; Malaysia
| | - Yusrida Darwis
- School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang; Malaysia
| | - Kok Khiang Peh
- School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang; Malaysia
| | | | - Yvonne Tze Fung Tan
- School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang; Malaysia
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12
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Lukyanov AN, Sawant RM, Hartner WC, Torchilin VP. PEGylated dextran as long-circulating pharmaceutical carrier. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 15:621-30. [PMID: 15264663 DOI: 10.1163/156856204323046889] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Dextran-polyethylene glycol (PEG) conjugates were synthesized by activating dextran hydroxy groups with carbonyldiimidazole, introducing amino groups by attaching ethylenediamine, and reacting amino groups with a succinimidyl-activated derivative of PEG. Conjugates with an average of 12 and 21 PEG (5 kDa) residues per single dextran (73 kDa) molecule were prepared. These conjugates have circulation half-lives of 5.3 h and 7.0 h, respectively, compared to 4.0 h for non-PEGylated dextran. The modification of dextran with PEG inhibits the uptake of polymer by the major organ of the reticuloendothelial system, the liver. Dextran-PEG conjugates may represent a convenient platform for long-circulating pharmaceutical preparations.
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Affiliation(s)
- Anatoly N Lukyanov
- Department of Pharmaceutical Sciences, Bouve College of Health Sciences, 312 Mugar Building, Northeastern University, Boston, MA 02115, USA
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Long LX, Yuan XB, Chang J, Zhang ZH, Gu MQ, Song TT, Xing Y, Yuan XY, Jiang SC, Sheng J. Self-assembly of polylactic acid and cholesterol-modified dextran into hollow nanocapsules. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.11.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Sahib MN, Darwis Y, Peh KK, Abdulameer SA, Tan YTF. Rehydrated sterically stabilized phospholipid nanomicelles of budesonide for nebulization: physicochemical characterization and in vitro, in vivo evaluations. Int J Nanomedicine 2011; 6:2351-66. [PMID: 22072872 PMCID: PMC3205131 DOI: 10.2147/ijn.s25363] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Inhaled corticosteroids provide unique systems for local treatment of asthma or chronic obstructive pulmonary disease. However, the use of poorly soluble drugs for nebulization has been inadequate, and many patients rely on large doses to achieve optimal control of their disease. Theoretically, nanotechnology with a sustained-release formulation may provide a favorable therapeutic index. The aim of this study was to determine the feasibility of using sterically stabilized phospholipid nanomicelles of budesonide for pulmonary delivery via nebulization. METHODS PEG(5000)-DSPE polymeric micelles containing budesonide (BUD-SSMs) were prepared by the coprecipitation and reconstitution method, and the physicochemical and pharmacodynamic characteristics of BUD-SSMs were investigated. RESULTS The optimal concentration of solubilized budesonide at 5 mM PEG(5000)-DSPE was 605.71 ± 6.38 μg/mL, with a single-sized peak population determined by photon correlation spectroscopy and a particle size distribution of 21.51 ± 1.5 nm. The zeta potential of BUD-SSMs was -28.43 ± 1.98 mV. The percent entrapment efficiency, percent yield, and percent drug loading of the lyophilized formulations were 100.13% ± 1.09%, 97.98% ± 1.95%, and 2.01% ± 0.02%, respectively. Budesonide was found to be amorphous by differential scanning calorimetry, and had no chemical interaction with PEGylated polymer according to Fourier transform infrared spectroscopy. Transmission electron microscopic images of BUD-SSMs revealed spherical nanoparticles. BUD-SSMs exhibited prolonged dissolution behavior compared with Pulmicort Respules (P < 0.05). Aerodynamic characteristics indicated significantly higher deposition in the lungs compared with Pulmicort Respules. The mass median aerodynamic, geometric standard deviation, percent emitted dose, and the fine particle fraction were 2.83 ± 0.08 μm, 2.33 ± 0.04 μm, 59.13% ± 0.19%, and 52.31% ± 0.25%, respectively. Intratracheal administration of BUD-SSMs 23 hours before challenge (1 mg/kg) in an asthmatic/chronic obstructive pulmonary disease rat model led to a significant reduction in inflammatory cell counts (76.94 ± 5.11) in bronchoalveolar lavage fluid compared with administration of Pulmicort Respules (25.06 ± 6.91). CONCLUSION The BUD-SSMs system might be advantageous for asthma or chronic obstructive pulmonary disease and other inflammatory airway diseases.
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Affiliation(s)
- Mohanad Naji Sahib
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, Malaysia.
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Ramtoola Z, Lyons P, Keohane K, Kerrigan SW, Kirby BP, Kelly JG. Investigation of the interaction of biodegradable micro- and nanoparticulate drug delivery systems with platelets. J Pharm Pharmacol 2010; 63:26-32. [DOI: 10.1111/j.2042-7158.2010.01174.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Abstract
Objectives
Biodegradable micro- and nanoparticles are being increasingly investigated for drug delivery and targeting of therapeutics. The size and surface properties of these particles are important factors influencing their interaction and uptake by various cells, tissues and organs. Optimising these properties, to enhance cellular uptake, may increase their potential for interaction with other physiological components such as platelets resulting in platelet activation and inappropriate thrombus formation. The aim of this study was to investigate the potential interaction of particulates with platelets.
Methods
Biodegradable micro- and nanoparticles based on poly-lactide-co-glycolide (PLGA), poly-lactide-co-glycolide–macrogol (PLGA-macrogol) and chitosan were prepared using solvent evaporation, spray drying or solvent dispersion techniques.
Key findings
Microparticles formulated had a median diameter (D50%) of 2–9 µm, while nanoparticles had an average diameter of 100–500 nm. The surface morphology ranged from smooth and spherical to irregular depending on polymer and preparation method used. Particles, reconstituted in the concentration range of 0.1–500 µg/ml, were tested for their ability to induce or inhibit platelet aggregation. No effects on either induction of platelet activity or inhibition of aggregation were detected.
Conclusions
None of the particles examined were found to alter platelet activity. These results suggested that the biodegradable micro- and nanoparticles tested were safe for use as potential drug carriers of therapeutic agents.
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Affiliation(s)
| | - Pierce Lyons
- School of Pharmacy, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Kieran Keohane
- School of Pharmacy, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Steve W Kerrigan
- School of Pharmacy, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Brian P Kirby
- School of Pharmacy, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - John G Kelly
- School of Pharmacy, Royal College of Surgeons in Ireland, Dublin, Ireland
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Pang Y, Liu J, Wu J, Li G, Wang R, Su Y, He P, Zhu X, Yan D, Zhu B. Synthesis, characterization, and in vitro evaluation of long-chain hyperbranched poly(ethylene glycol) as drug carrier. Bioconjug Chem 2010; 21:2093-102. [PMID: 20923233 DOI: 10.1021/bc100325a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of novel long-chain hyperbranched poly(ethylene glycol)s (LHPEGs) with biodegradable connections were designed and synthesized in one pot through proton-transfer polymerization using PEG and commercial glycidyl methacrylate as monomers and potassium hydride as catalyst. The LHPEGs were hydrolyzed at neutral pH resulting in the decrease of molecular weights. In vitro evaluation demonstrated that LHPEGs were biocompatible and displayed negligible hemolytic activity. The efficient cellular uptake of LHPEGs was confirmed by flow cytometry and confocal laser scanning microscopy. Moreover, conjugation of a model hydrophobic anticancer drug methotrexate to LHPEGs inhibited the proliferation of a human cervical carcinoma Hela cell line. MTT assay indicated that the conjugated methotrexate dose required for 50% cellular growth inhibition against Hela cells was 20 μg/mL. By combining the advantages of long-chain hyperbranched structure and PEG, LHPEG provides a promising drug carrier for therapeutic fields.
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Affiliation(s)
- Yan Pang
- Instrumental Analysis Center, Shanghai Jiao Tong University, People's Republic of China
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Abstract
Esterification of xylan with ibuprofen via activiation of the carboxylic acid with N,N'-carbonyldiimidazole (CDI) yields products of high drug loadings. Subsequent sulfation of xylan ibuprofen esters using the gentle agent SO(3)/DMF was successfully carried out in order to modify hydrophobicity of the xylan esters. The structure of the novel xylan esters was evaluated by means of NMR spectroscopy. The resulting xylan derivatives self assemble into spherical nanoparticles with mean diameters ranging from 162 to 472 nm. Preliminary stability measurements indicate that hydrolytic stability decreases with increase in degree of substitution of sulfate groups. Thus, a new concept toward improved drug delivery from polysaccharide-based nanoparticles can be established here.
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Affiliation(s)
- Stephan Daus
- Center of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, Humboldtstrasse 10, D-07743 Jena, Germany
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Yang Y, Cai J, Zhuang X, Guo Z, Jing X, Chen X. pH-dependent self-assembly of amphiphilic poly(l-glutamic acid)-block-poly(lactic-co-glycolic acid) copolymers. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.04.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Malloggi F, Pannacci N, Attia R, Monti F, Mary P, Willaime H, Tabeling P, Cabane B, Poncet P. Monodisperse colloids synthesized with nanofluidic technology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:2369-2373. [PMID: 19916489 DOI: 10.1021/la9028047] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Limitations in the methods employed to generate micrometric colloidal droplets hinder the emergence of key applications in the fields of material science and drug delivery. Through the use of dedicated nanofluidic devices and by taking advantage of an original physical effect called capillary focusing, we could circumvent some of these limitations. The nanofluidic (i.e., submicrometric) devices introduced herein are made of soft materials, and their fabrication relies upon rapid technologies. The objects that we have generated are simple droplets, multiple droplets, particles, and Janus particles whose sizes lie between 900 nm and 3 microm (i.e., within the colloidal range). Colloidal droplets have been assembled on-chip into clusters and crystals, yielding discrete diffraction patterns. We illustrate potential applications in the field of drug delivery by demonstrating the ability of multiple droplets to be phagocytosed by murine macrophage-type cells.
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Jongpaiboonkit L, Franklin-Ford T, Murphy WL. Growth of hydroxyapatite coatings on biodegradable polymer microspheres. ACS APPLIED MATERIALS & INTERFACES 2009; 1:1504-11. [PMID: 20161578 PMCID: PMC2806690 DOI: 10.1021/am9001716] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Mineral-coated microspheres were prepared via a bioinspired, heterogeneous nucleation process at physiological temperature. Poly(d,l-lactide-co-glycolide) (PLG) microspheres were fabricated via a water-in-oil-in-water emulsion method and were mineral-coated via incubation in a modified simulated body fluid (mSBF). X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy with associated energy-dispersive X-ray spectroscopy confirmed the presence of a continuous mineral coating on the microspheres. The mineral grown on the PLG microsphere surface has characteristics analogous to those of bone mineral (termed "bonelike" mineral), with a carbonate-containing hydroxyapatite phase and a porous structure of platelike crystals at the nanometer scale. The assembly of mineral-coated microspheres into aggregates was observed when microsphere concentrations above 0.50 mg/mL were incubated in mSBF for 7 days, and the size of the aggregates was dependent on the microsphere concentration in solution. In vitro mineral dissolution studies performed in Tris-buffered saline confirmed that the mineral formed was resorbable. A surfactant additive (Tween 20) was incorporated into mSBF to gain insight into the mineral growth process, and Tween 20 not only prevented aggregation but also significantly inhibited mineral formation and influenced the characteristics of the mineral formed on the surface of PLG microspheres. Taken together, these findings indicate that mineral-coated PLG microspheres or mineral-coated microsphere aggregates can be synthesized in a controllable manner using a bioinspired process. These materials may be useful in a range of applications, including controlled drug delivery and biomolecule purification.
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Affiliation(s)
- Leenaporn Jongpaiboonkit
- Departments of Biomedical Engineering, Pharmacology, and Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA
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21
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Long-circulating polymeric nanoparticles bearing a combinatorial coating of PEG and water-soluble chitosan. Biomaterials 2009; 30:2340-8. [PMID: 19150737 DOI: 10.1016/j.biomaterials.2008.12.070] [Citation(s) in RCA: 183] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Accepted: 12/28/2008] [Indexed: 11/24/2022]
Abstract
A major obstacle in the development of polymeric nanoparticles (NPs) as effective drug delivery vesicles is the rapid clearance from blood. In order to realize a significant prolongation in blood circulation, a combinatorial design, covalent attachment of polyethylene glycol (PEG) to polylactic acid (PLA) and physical adsorption of water-soluble chitosan (WSC) to particle surface, has been developed for surface modification of PLA NPs. Two types of WSC, cationic partially deacetylated chitin (PDC) and anionic N-carboxy propionyl chitosan sodium (CPCTS) were investigated. All the NPs formulated in the size range of 100-200nm were prepared by a modified w/o/w technique and physicochemically characterized. In vitro phagocytosis by mouse peritoneal macrophage (MPM), in vivo blood clearance and biodistribution following intravenous administration in mice, of these NPs labeled with 6-coumarin, were evaluated. The presence of WSC, whether alone or with PEG, highly improved the surface hydrophilicity as well as suspension stability of NPs. Their surface charge was greatly affected by the WSC coating, being close to neutrality for PEG/PDC NPs and highly negative in the case of PEG/CPCTS NPs. In comparison to NPs treated with PEG or WSC alone, the synergistic action of PEG and WSC strongly inhibited the macrophage uptake and extended the circulation half-life (t(1/2)) with concomitant reduced liver sequestration. Particularly, PEG/PDC NPs showed the most striking result with regard to their performance in vitro and in vivo. Calculated t(1/2) of PEG/PDC NPs and PEG/CPCTS NPs was 63.5h and 7.1h, respectively, much longer than that of control PEG/PVA NPs (1.1h). More WSC materials need to be evaluated, but the present data suggest that, a combinatorial coating of PEG and PDC greatly prolongs the systemic circulation of NPs and represents a significant step in the development of long-circulating drug delivery carriers.
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22
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Ofokansi KC, Adikwu MU, Okore VC. Preparation and Evaluation of Mucin-Gelatin Mucoadhesive Microspheres for Rectal Delivery of Ceftriaxone Sodium. Drug Dev Ind Pharm 2008; 33:691-700. [PMID: 17613033 DOI: 10.1080/03639040701360876] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Soluble mucin (S-mucin) processed from the small intestines (ileal region) of freshly slaughtered pigs via homogenization, dialysis, centrifugation and lyophilization and its admixtures with type A gelatin were dispersed in an aqueous medium and used to formulate ceftriaxone sodium-loaded mucoadhesive microspheres by the emulsification cross-linking method using arachis oil as the continuous phase. The release profile of ceftriaxone sodium from the microspheres was evaluated in both simulated gastric fluid (SGF) without pepsin (pH 1.2) and simulated intestinal fluid (SIF) without pancreatin (pH 7.4). The microspheres were further evaluated as possible novel delivery system for rectal delivery of ceftriaxone sodium in rats. Release of ceftriaxone sodium from the microspheres in both release media was found to occur predominantly by diffusion following non-Fickian transport mechanism and was higher and more rapid in SIF than in SGF. The results obtained from this study may indicate that ceftriaxone sodium could be successfully delivered rectally when embedded in microspheres formulated with either type A gelatin alone or its admixtures with porcine mucin; hence providing a therapeutically viable alternative route for the delivery of this acid-labile third generation cephalosporin.
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Affiliation(s)
- K C Ofokansi
- Drug Delivery Research Unit, Department of Pharmaceutics, University of Nigeria, Nsukka, Enugu State, Nigeria.
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23
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Thompson M, Vadala T, Vadala M, Lin Y, Riffle J. Synthesis and applications of heterobifunctional poly(ethylene oxide) oligomers. POLYMER 2008. [DOI: 10.1016/j.polymer.2007.10.029] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Aumelas A, Serrero A, Durand A, Dellacherie E, Leonard M. Nanoparticles of hydrophobically modified dextrans as potential drug carrier systems. Colloids Surf B Biointerfaces 2007; 59:74-80. [PMID: 17560095 DOI: 10.1016/j.colsurfb.2007.04.021] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2007] [Revised: 04/24/2007] [Accepted: 04/24/2007] [Indexed: 10/23/2022]
Abstract
Nanoparticles combining a hydrophobically modified dextran core and a polysaccharide surface coverage were elaborated. Their suitability for applications like drug delivery was evaluated. The selected polysaccharide, dextran, was chemically modified by the covalent attachment of hydrocarbon groups (aliphatic or aromatic) via the formation of ether links. According to the extent of modification, either water-soluble or water-insoluble dextran derivatives were obtained. The latter exhibited solubility in organic solvents like tetrahydrofuran or dichloromethane saturated with water. Water-soluble dextran derivatives were used as polymeric surfactants for the control of nanoparticles surface characteristics. Nanoparticles were prepared either by o/w emulsion or solvent-diffusion methods. The size and surface properties of dextran nanoparticles were correlated to processing conditions. The stability of colloidal suspensions was examined as a function of ionic strength and related to the particle surface characteristics. The redispersability of freeze-dried suspensions without the addition of cryoprotectant was demonstrated. Finally, the degradability of modified dextrans was compared to that of starting dextran, after enzymatic hydrolysis in the presence of dextranase.
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Affiliation(s)
- A Aumelas
- Laboratoire de Chimie Physique Macromoléculaire, UMR 7568 CNRS-Nancy University, ENSIC, BP 20451, 54001 Nancy Cedex, France
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25
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Messai I, Delair T. Cationic biodegradable particles: Comparison of one or two step processes. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2005.12.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Hans M, Shimoni K, Danino D, Siegel SJ, Lowman A. Synthesis and characterization of mPEG-PLA prodrug micelles. Biomacromolecules 2005; 6:2708-17. [PMID: 16153110 DOI: 10.1021/bm050188k] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polymeric prodrugs of mPEG-PLA-haloperidol (methoxypoly(ethylene glycol)-b-poly(lactic acid)) can self-assemble into nanoscale micelle-like structures in aqueous solutions. mPEG-PLA-haloperidol was prepared and characterized using 1H and 13C NMR. The conjugation efficiency was found to be 64.8 +/- 21%. Micelles that form spontaneously upon solubilization of the mPEG-PLA and the polymeric prodrugs in water were characterized using a variety of techniques. The mPEG-PLA and prodrug micelles were found to have diameters of 28.73 +/- 1.45 and 49.67 +/- 4.29 nm, respectively, using dynamic light scattering (DLS). The micelle size and polydispersity were also evaluated with cryogenic transmission electron microscopy (cryo-TEM) and were consistent with the DLS results. Cryo-TEM and proton NMR confirmed that the micelles were spherical in shape. DLS was also used to determine the aggregation numbers of the micelles. The aggregation numbers ranged from 351 to 603. The change in aggregation number was dependent on the total drug incorporation into the micelle core. Critical micelle concentrations were determined for the various micelle/drug formulations and found to range from 3 to 14 microg/mL. Finally, drug was incorporated into the micelle core using the conjugate, free drug with a saturated aqueous phase during production, or a combination of both techniques. Drug incorporation could be increased from 3% to 20% (w/w) using the different formulations.
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Affiliation(s)
- Meredith Hans
- Biomaterials and Drug Delivery Laboratory, Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
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27
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Xie Z, Guan H, Lü C, Chen X, Jing X. Synthesis and characterization of novel biotinylated biodegradable poly(ethylene glycol)-b-poly(carbonate-lactic acid) copolymers. Acta Biomater 2005; 1:635-41. [PMID: 16701844 DOI: 10.1016/j.actbio.2005.07.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2005] [Revised: 06/24/2005] [Accepted: 07/20/2005] [Indexed: 11/21/2022]
Abstract
Poly(ethylene glycol)-b-poly(5-benzyloxy-trimethylene carbonate-lactic acid) copolymers (PEG-b-P(BTMC-LA)) were synthesized by ring-opening polymerization of lactide and 5-benzyloxy trimethylene carbonate in the presence of mono-hydroxyl poly(ethylene glycol) with diethyl zinc as catalyst. They were further converted into deprotected copolymers with the pendant hydroxyl groups by hydrogenolysis in the presence of Pd(OH)2/C, and finally conjugated with biotin through the free hydroxyl groups. Gel permeation chromatography, Fourier transform infrared, differential scanning calorimetry and 1H nuclear magnetic resonance studies confirmed the copolymer structures and successful attachment of biotin to the copolymer.
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Affiliation(s)
- Zhigang Xie
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, PR China
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28
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Lemarchand C, Gref R, Couvreur P. Polysaccharide-decorated nanoparticles. Eur J Pharm Biopharm 2005; 58:327-41. [PMID: 15296959 DOI: 10.1016/j.ejpb.2004.02.016] [Citation(s) in RCA: 314] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2004] [Accepted: 02/24/2004] [Indexed: 11/30/2022]
Abstract
Surface modified colloidal carriers such as nanoparticles are able to modulate the biodistribution of the loaded drug when given intravenously, but also to control the absorption of drugs administered by other routes. This review presents the different strategies to coat the surface of polymeric as well as inorganic nanoparticles with polysaccharides. Various physicochemical and biological methods have been described to demonstrate such surface modification. The medical applications, mainly in imaging cancer, of polysaccharide-coated nanoparticles are presented, including their abilities to increase the blood circulation time and to target specific tumoral tissues. It has been shown that these coatings allow also to improve drug absorption via nasal or ocular pathways, due the mucoadhesive and/or permeability enhancer properties of the polysaccharides. Finally, the ability of polysaccharide-coated nanoparticles to deliver DNA or oligonucleotides will be discussed.
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Affiliation(s)
- Caroline Lemarchand
- UMRCNRS 8612, School of Pharmacy, Université Paris Sud, Châtenay Malabry, France
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29
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A phenol biosensor based on immobilizing tyrosinase to modified core-shell magnetic nanoparticles supported at a carbon paste electrode. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2004.10.077] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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30
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Fiegel J, Fu J, Hanes J. Poly(ether-anhydride) dry powder aerosols for sustained drug delivery in the lungs. J Control Release 2004; 96:411-23. [PMID: 15120898 DOI: 10.1016/j.jconrel.2004.02.018] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2004] [Accepted: 02/20/2004] [Indexed: 10/26/2022]
Abstract
A new family of biodegradable ether-anhydride polymers was used to develop microparticles capable of controlled drug release and inhalation as a dry powder. The polymers are composed of various ratios of sebacic acid (SA) (to render the polymer insoluble in water) and poly(ethylene glycol) (PEG) (to reduce particle clearance by macrophages and improve aerosolization). Particle aerodynamic diameter was controlled within the respirable range by producing geometrically large, but low density particles as a first step toward reducing particle adhesion forces that limit efficient aerosolization of dry powders. Particles made from a variety of polymer compositions possessed high emitted doses (>80%) from a Spinhaler dry powder inhaler (DPI). Control over particle surface and bulk properties (surface roughness, surface charge, density and water retention) was achieved by varying the percentage of PEG in the polymer backbone. The addition of 10% PEG into the polymer backbone significantly enhanced deposition in the lower stages of an in vitro lung model following aerosolization from the DPI (fine particle fractions [FPF] reached 30%). Efficient aerosolization from an obsolete DPI combined with the ability to evade phagocytic clearance and provide controlled release of various drug molecules make these particles promising for prolonged drug delivery in the lung.
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Affiliation(s)
- Jennifer Fiegel
- Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
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31
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Mi FL, Shyu SS, Lin YM, Wu YB, Peng CK, Tsai YH. Chitin/PLGA blend microspheres as a biodegradable drug delivery system: a new delivery system for protein. Biomaterials 2004; 24:5023-36. [PMID: 14559016 DOI: 10.1016/s0142-9612(03)00413-7] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Novel chitin/PLGAs and chitin/PLA based microspheres were developed for the delivery of protein. These biodegradable microspheres were prepared by polymers blending and wet phase-inversion methods. The parameters such as selected non-solvents, temperature of water and ratio of polylactide to polyglycolide were adjusted to improve thermodynamic compatibility of individual polymer (chitin and PLGAs or chitin/PLA), which affects the hydration and degradation properties of the blend microspheres. Triphasic pattern of drug release model is observed from the release of protein from the chitin/PLGAs and chitin/PLA microspheres: the initially fast release (the first phase), the following slow release (the second phase) and the second burst release (the third phase). Formulations of the blends, which are based on the balance among the hydration rate of the chitin phase and degradation of chitin/PLA and PLGA phase, can lead to a controllable release of bovine serum albumin (BSA). In conclusion, such a chitin/PLGA 50/50 microsphere is novel and interesting, and may be used as a protein delivery system.
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Affiliation(s)
- Fwu-Long Mi
- Division of Applied Chemistry, Department of Applied Science, Chinese Naval Academy, 669 Jiun Shiaw Road, Kaohsiung, Taiwan 813, ROC
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32
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Yoon MK, Choi YW. Improved Antigen Delivery Systems with PLGA Microsphere for a Single-Step Immunization. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2004. [DOI: 10.4333/kps.2004.34.1.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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33
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Novel immunoassay for Toxoplasma gondii-specific immunoglobulin G using a silica nanoparticle-based biomolecular immobilization method. Anal Chim Acta 2004. [DOI: 10.1016/j.aca.2003.09.018] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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34
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Rouzes C, Leonard M, Durand A, Dellacherie E. Influence of polymeric surfactants on the properties of drug-loaded PLA nanospheres. Colloids Surf B Biointerfaces 2003. [DOI: 10.1016/s0927-7765(03)00152-8] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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35
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Zweers MLT, Grijpma DW, Engbers GHM, Feijen J. The preparation of monodisperse biodegradable polyester nanoparticles with a controlled size. J Biomed Mater Res B Appl Biomater 2003; 66:559-66. [PMID: 12861608 DOI: 10.1002/jbm.b.10046] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In local drug delivery, nanoparticles based on biodegradable polymers can function as vehicles with controlled drug-release properties. To achieve a well-controlled drug-release profile, control over the particle size is of great importance. Therefore, biodegradable polyester nanoparticles were prepared by the salting-out method. Process variables were varied to study the effect on the particle size. The monodisperse particles obtained were between 100 and 400 nm in size and spherical in shape. It was found that the particle size could be adjusted by varying the preparation conditions upon which the polymer concentration had the most pronounced effect.
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Affiliation(s)
- Miechel L T Zweers
- Department of Polymer Chemistry and Biomaterials, Institute for Biomedical Technology, Faculty of Chemical Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
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36
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Deshpande MC, Garnett MC, Vamvakaki M, Bailey L, Armes SP, Stolnik S. Influence of polymer architecture on the structure of complexes formed by PEG-tertiary amine methacrylate copolymers and phosphorothioate oligonucleotide. J Control Release 2002; 81:185-99. [PMID: 11992691 DOI: 10.1016/s0168-3659(02)00052-4] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The influence of polymer structure on the characteristics of complexes of a phosphorothioate antisense oligonucleotide (ISIS 5132) was studied, using well-defined cationic copolymers based on 2-(dimethylamino) ethyl methacrylate (DMAEMA) and poly(ethylene glycol) (PEG). The three related copolymer structures were: DMAEMA-PEG (a diblock copolymer) DMAEMA-OEGMA 7 (a brush-type copolymer), DMAEMA-stat-PEGMA (a comb-type copolymer); each of these were examined together with DMAEMA homopolymer, which served as a control. The results revealed that all the polymers exhibited good binding ability with the oligonucleotide (ON). Interestingly, the comb-type polymer DMAEMA-stat-PEGMA demonstrated the highest binding ability and DMAEMA homopolymer the lowest, as judged by a dye displacement assay. DMAEMA homopolymer produced large agglomerates of smaller individual complexes as observed by optical density, photon correlation spectroscopy and transmission electron microscopy studies. In contrast, two PEG-block copolymers, DMAEMA-PEG and DMAEMA-OEGMA 7, formed compact complexes of 80-150 nm which had good long-term colloidal stability. This is attributed to the steric stabilisation effect of the PEG chains on the ON-copolymer complexes. These two copolymers are believed to form complexes with ON that have a micellar structure. Comb-type DMAEMA-stat-PEGMA copolymer formed highly soluble complexes with the ON that did not phase separate from the buffer solution. This study clearly demonstrates that varying the copolymer architecture allows access to a range of ON complexes. In vitro cytotoxicity experiments on HepG2 cells showed that all of the tertiary amine methacrylate copolymers displayed lower cytotoxicity than the control poly(L-lysine).
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Affiliation(s)
- Mangesh C Deshpande
- School of Pharmaceutical Sciences, Boots Research Institute, University of Nottingham, University Park, NG7 2RD, Nottingham, UK
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37
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Pharmaceutical Polymeric Controlled Drug Delivery Systems. FILLED ELASTOMERS DRUG DELIVERY SYSTEMS 2002. [DOI: 10.1007/3-540-45362-8_2] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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38
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Whitaker MJ, Quirk RA, Howdle SM, Shakesheff KM. Growth factor release from tissue engineering scaffolds. J Pharm Pharmacol 2001; 53:1427-37. [PMID: 11732745 DOI: 10.1211/0022357011777963] [Citation(s) in RCA: 159] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Synthetic scaffold materials are used in tissue engineering for a variety of applications, including physical supports for the creation of functional tissues, protective gels to aid in wound healing and to encapsulate cells for localized hormone-delivery therapies. In order to encourage successful tissue growth, these scaffold materials must incorporate vital growth factors that are released to control their development. A major challenge lies in the requirement for these growth factor delivery mechanisms to mimic the in-vivo release profiles of factors produced during natural tissue morphogenesis or repair. This review highlights some of the major strategies for creating scaffold constructs reported thus far, along with the approaches taken to incorporate growth factors within the materials and the benefits of combining tissue engineering and drug delivery expertise.
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Affiliation(s)
- M J Whitaker
- School of Pharmaceutical Sciences, The University of Nottingham, UK
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39
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Affiliation(s)
- Arul Jayaraman
- Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital, Harvard Medical School, and Shriners Burns Hospital, Boston, Massachusetts 02114
| | - Martin L. Yarmush
- Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital, Harvard Medical School, and Shriners Burns Hospital, Boston, Massachusetts 02114
| | - Charles M. Roth
- Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital, Harvard Medical School, and Shriners Burns Hospital, Boston, Massachusetts 02114
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40
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Konno T, Kurita K, Iwasaki Y, Nakabayashi N, Ishihara K. Preparation of nanoparticles composed with bioinspired 2-methacryloyloxyethyl phosphorylcholine polymer. Biomaterials 2001; 22:1883-9. [PMID: 11396894 DOI: 10.1016/s0142-9612(00)00373-2] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The poly(L-lactic acid) nanoparticles immobilized with 2-methacryloyloxyethyl phosphorylcholine (MPC) polymer, which has excellent blood compatibility, were prepared by a solvent evaporation technique using the water-soluble amphiphilic MPC polymer as an emulsifier and a surface modifier. The diameter and zeta-potential of the obtained nanoparticles strongly depended on the concentration of the MPC polymer. When the nanoparticles were prepared in 1.0 mg/ml of an MPC polymer aqueous solution, the diameter was 221 nm which was determined by atomic force microscopy and dynamic light scattering measurements. The X-ray photoelectron spectroscopic analysis indicated that the phosphorylcholine groups of the MPC unit were located at the surface of the nanoparticles, that is, the MPC polymer was immobilized on the PLA particles and the surface zeta-potential was -2.5 mV. Various hydrophobic fluorescence probes could permeate through the MPC polymer layer and adsorb on the PLA surface. The amount of bovine serum albumin adsorbed on the nanoparticles was significantly smaller compared with that on the conventional polystyrene nanoparticles. It is suggested that the nanoparticles immobilized with the MPC polymer have the potential for use as both a novel drug carrier and diagnostic reagent which can come in contact with blood components.
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Affiliation(s)
- T Konno
- Department of Materials Science, Graduate School of Engineering, The University of Tokyo, Japan
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41
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Quirk RA, Briggs D, Davies MC, Tendler SJB, Shakesheff KM. Characterization of the spatial distributions of entrapped polymers following the surface engineering of poly(lactic acid). SURF INTERFACE ANAL 2001. [DOI: 10.1002/sia.951] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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42
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Poly(benzyloxy ethyl methacrylate): preparation by free radical polymerization and by group transfer polymerization; with subsequent debenzylation to form poly(2-hydroxyethyl methacrylate). Eur Polym J 2000. [DOI: 10.1016/s0014-3057(99)00256-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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43
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Rouzes C, Gref R, Leonard M, De Sousa Delgado A, Dellacherie E. Surface modification of poly(lactic acid) nanospheres using hydrophobically modified dextrans as stabilizers in an o/w emulsion/evaporation technique. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 50:557-65. [PMID: 10756314 DOI: 10.1002/(sici)1097-4636(20000615)50:4<557::aid-jbm11>3.0.co;2-r] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Sterically stabilized biocompatible poly(lactic acid) (PLA) nanospheres were prepared by an o/w emulsion/evaporation technique, using hydrophobically modified dextrans (DexP) as the emulsion stabilizer. Photon correlation spectroscopy, zetametry, and differential scanning calorimetry studies corroborated that interfacial adhesion between immiscible dextran and PLA chains was achieved by compatibilization of polymer segments via hydrophobic groups grafted onto dextran and thus leading to the formation of entanglements between the hydrophobic dextran parts and the PLA matrix. The presence of dextran exposed at the particle surface was confirmed by X-ray photoelectron spectroscopy and by the fact that the suspensions showed an increased stability in concentrated NaCl solutions and a reduction of bovine serum albumin adsorption compared to uncoated PLA nanoparticles. A comparison of the characteristics of PLA nanospheres DexP-coated via the emulsion procedure (NS(em)) with those of PLA particles coated by DexP adsorption (NS(ad)) suggests that the conformation of the polymer in the superficial layers may be different. However, both DexP layers behave similarly in terms of stability and protein adsorption.
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Affiliation(s)
- C Rouzes
- Laboratoire de Chimie Physique Macromoléculaire, UMR CNRS-INPL 7568, Groupe ENSIC, 1 rue Grandville, BP 451, F-54001 Nancy Cedex, France
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Yang L, Alexandridis P. Physicochemical aspects of drug delivery and release from polymer-based colloids. Curr Opin Colloid Interface Sci 2000. [DOI: 10.1016/s1359-0294(00)00046-7] [Citation(s) in RCA: 180] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kim KJ, Byun Y. Preparation and characterizations of self-assembled PEGylated gelatin nanoparticles. BIOTECHNOL BIOPROC E 1999. [DOI: 10.1007/bf02931931] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Orban JM, Chapman TM, Wagner WR, Jankowski R. Easily grafted polyurethanes with reactive main chain functional groups. Synthesis, characterization, and antithrombogenicity of poly(ethylene glycol)-grafted poly(urethanes). ACTA ACUST UNITED AC 1999. [DOI: 10.1002/(sici)1099-0518(19990901)37:17<3441::aid-pola1>3.0.co;2-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Duro R, Souto C, Gómez-Amoza JL, Martínez-Pacheco R, Concheiro A. Interfacial adsorption of polymers and surfactants: implications for the properties of disperse systems of pharmaceutical interest. Drug Dev Ind Pharm 1999; 25:817-29. [PMID: 10459488 DOI: 10.1081/ddc-100102244] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This review considers basic aspects of the interfacial adsorption of polymers and surfactants, with particular reference to the relevance of these processes for the formulation of pharmaceutical disperse systems. First, we discuss different approaches to the interpretation of adsorption isotherms, paying particular attention to systems containing more than one adsorbate. Second, we consider the implications of adsorption for the properties of suspensions, emulsions, and colloidal systems, particularly as regards the use of polymers and surfactants for stabilizing disperse systems, for controlling flocculation, and for modifying the biopharmaceutical behavior of colloidal drug carriers. Finally, we present a number of representative examples of the importance of adsorption of macromolecules in pharmaceutical systems.
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Affiliation(s)
- R Duro
- Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, Spain
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Affiliation(s)
- C Monfardini
- Department of Pharmaceutical Sciences, University of Padova, Padova, Italy
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