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Panigrahi SK, Das S, Majumdar S. Unveiling the potentials of hydrophilic and hydrophobic polymers in microparticle systems: Opportunities and challenges in processing techniques. Adv Colloid Interface Sci 2024; 326:103121. [PMID: 38457900 DOI: 10.1016/j.cis.2024.103121] [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] [Received: 12/18/2023] [Revised: 02/24/2024] [Accepted: 02/28/2024] [Indexed: 03/10/2024]
Abstract
Conventional drug delivery systems are associated with various shortcomings, including low bioavailability and limited control over release. Biodegradable polymeric microparticles have emerged as versatile carriers in drug delivery systems addressing all these challenges. This comprehensive review explores the dynamic landscape of microparticles, considering the role of hydrophilic and hydrophobic materials. Within the continuously evolving domain of microparticle preparation methods, this review offers valuable insights into the latest advancements and addresses the factors influencing microencapsulation, which is pivotal for harnessing the full potential of microparticles. Exploration of the latest research in this dynamic field unlocks the possibilities of optimizing microencapsulation techniques to produce microparticles of desired characteristics and properties for different applications, which can help contribute to the ongoing evolution in the field of pharmaceutical science.
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Affiliation(s)
- Subrat Kumar Panigrahi
- Department of Chemical Engineering, Indian Institute of Technology, Hyderabad, Telangana 502285, India
| | - Sougat Das
- Department of Chemical Engineering, Indian Institute of Technology, Hyderabad, Telangana 502285, India
| | - Saptarshi Majumdar
- Department of Chemical Engineering, Indian Institute of Technology, Hyderabad, Telangana 502285, India.
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2
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A Micro-In-Macro Gastroretentive System for the Delivery of Narrow-Absorption Window Drugs. Polymers (Basel) 2023; 15:polym15061385. [PMID: 36987166 PMCID: PMC10055986 DOI: 10.3390/polym15061385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/01/2023] [Accepted: 03/08/2023] [Indexed: 03/12/2023] Open
Abstract
A micro-in-macro gastroretentive and gastrofloatable drug delivery system (MGDDS), loaded with the model-drug ciprofloxacin, was developed in this study to address the limitations commonly experienced in narrow-absorption window (NAW) drug delivery. The MGDDS, which consists of microparticles loaded in a gastrofloatable macroparticle (gastrosphere) was designed to modify the release of ciprofloxacin, allowing for an increased drug absorption via the gastrointestinal tract. The prepared inner microparticles (1–4 µm) were formed by crosslinking chitosan (CHT) and Eudragit® RL 30D (EUD), with the outer gastrospheres prepared from alginate (ALG), pectin (PEC), poly(acrylic acid) (PAA) and poly(lactic-co-glycolic) acid (PLGA). An experimental design was utilized to optimize the prepared microparticles prior to Fourier Transition Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM) and in vitro drug release studies. Additionally, the in vivo analysis of the MGDDS, employing a Large White Pig model and molecular modeling of the ciprofloxacin-polymer interactions, were performed. The FTIR results determined that the crosslinking of the respective polymers in the microparticle and gastrosphere was achieved, with the SEM analysis detailing the size of the microparticles formed and the porous nature of the MGDDS, which is essential for drug release. The in vivo drug release analysis results further displayed a more controlled ciprofloxacin release profile over 24 h and a greater bioavailability for the MGDDS when compared to the marketed immediate-release ciprofloxacin product. Overall, the developed system successfully delivered ciprofloxacin in a control-release manner and enhanced its absorption, thereby displaying the potential of the system to be used in the delivery of other NAW drugs.
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3
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Physicochemical and pharmacological investigations of polyvinylpyrrolidone - tetrahydroxyborate hydrogel containing the local anesthetic lidocaine. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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4
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Pan F, Amarjargal A, Altenried S, Liu M, Zuber F, Zeng Z, Rossi RM, Maniura-Weber K, Ren Q. Bioresponsive Hybrid Nanofibers Enable Controlled Drug Delivery through Glass Transition Switching at Physiological Temperature. ACS APPLIED BIO MATERIALS 2021; 4:4271-4279. [PMID: 35006839 DOI: 10.1021/acsabm.1c00099] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
To avoid excessive usage of antibiotics and antimicrobial agents, smart wound dressings permitting controlled drug release for treatment of bacterial infections are highly desired. In search of a sensitive stimulus to activate drug release under physiological conditions, we found that the glass transition temperature (Tg) of a polymer or polymer blend can be an ideal parameter because a thermal stimulus can regulate drug release at the physiological temperature of 37 °C. A well-tuned Tg for a controlled drug release from fibers at 37 °C was achieved by varying the blending ratio of Eudragit® RS 100 and poly(methyl methacrylate). Octenidine, an antimicrobial agent often used in wound treatment, was encapsulated into the polymer blend during the electrospinning process and evaluated for its controlled release based on modulation of temperature. The thermal switch of the nanofibrous membranes can be turned "on" at physiological temperature (37 °C) and "off" at room temperature (25 °C), conferring a controlled release of octenidine. It was found that octenidine can be released in an amount at least 8.5 times higher (25 mg·L-1) during the "on" stage compared to the "off" stage after 24 h, which was regulated by the wet Tg (34.8-36.5 °C). The "on"/"off" switch for controlled drug release can moreover be repeated at least 5 times. Furthermore, the fabricated nanofibrous membranes displayed a distinctive antibacterial activity, causing a log3 reduction of the viable cells for both Gram negative and positive pathogens at 37 °C, when the thermal switch was "on". This study forms the groundwork for a treatment concept where no external stimulus is needed for the release of antimicrobials at physiological conditions, and will help reduce the overuse of antibiotics by allowing controlled drug release.
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Affiliation(s)
- Fei Pan
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biointerfaces, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Altangerel Amarjargal
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biomimetic Membranes and Textiles, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland.,Power Engineering School, Mongolian University of Science and Technology, Baga Toiruu 34, 14191 Ulaanbaatar, Mongolia
| | - Stefanie Altenried
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biointerfaces, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Mengdi Liu
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biointerfaces, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland.,Department of Earth- and Environmental Sciences, Ludwig Maximilian University of Munich, Theresienstrasse 41, 80333 Munich, Germany
| | - Flavia Zuber
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biointerfaces, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Zhihui Zeng
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Cellulose & Wood Materials, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland
| | - René M Rossi
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biomimetic Membranes and Textiles, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Katharina Maniura-Weber
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biointerfaces, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Qun Ren
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biointerfaces, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
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Cantin O, Siepmann F, Willart J, Danede F, Siepmann J, Karrout Y. PEO hot melt extrudates for controlled drug delivery: Importance of the type of drug and loading. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2020.102238] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Kožák J, Rabišková M, Lamprecht A. In-vitro drug release testing of parenteral formulations via an agarose gel envelope to closer mimic tissue firmness. Int J Pharm 2020; 594:120142. [PMID: 33326826 DOI: 10.1016/j.ijpharm.2020.120142] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 11/10/2020] [Accepted: 11/28/2020] [Indexed: 01/20/2023]
Abstract
Current in vitro drug-release testing of the sustained-release parenterals represents the in vivo situation insufficiently. In this work, a thin agarose hydrogel layer surrounding the tested dosage form was proposed to mimic the tissue. The method was applied on implantable formulations of different geometries (films, microspheres, and cylindrical implants); prepared from various polymers (several Resomer® grades or ethyl cellulose) and loaded with different model drugs: flurbiprofen, lidocaine or risperidone. The hydrogel layer did not possess any retarding effect on the released drug and acted as a physical restriction to swelling and/or plastic deformation of the tested dosage forms. This led to a different surface area available for drug-release compared with testing in release medium alone and correspondingly to significantly different release profiles of the majority of the formulations obtained between the two methods (e.g. t50% = 18 days in pure release medium vs. t50% = 26 days in gel-setup for risperidone loaded Resomer® 503 H films or t50% = 7 days vs. t50% = 19 days for risperidone loaded Resomer® 503 H microspheres). The limited space for swelling and the rigidity of the agarose gel might mimic the tight encapsulation of the dosage form in the tissue better than the conventional liquid medium.
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Affiliation(s)
- Jan Kožák
- Department of Pharmaceutics, Institute of Pharmacy, University of Bonn, Gerhard-Domagk-Straße 3, 53121 Bonn, Germany; Department of Pharmaceutical Technology, Faculty of Pharmacy, Charles University, Akademika Heyrovskeho 1203/8, 500 05 Hradec Kralove, Czech Republic
| | - Miloslava Rabišková
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Charles University, Akademika Heyrovskeho 1203/8, 500 05 Hradec Kralove, Czech Republic
| | - Alf Lamprecht
- Department of Pharmaceutics, Institute of Pharmacy, University of Bonn, Gerhard-Domagk-Straße 3, 53121 Bonn, Germany.
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Xiao MC, Chou YH, Hung YN, Hu SH, Chiang WH. Hybrid polymeric nanoparticles with high zoledronic acid payload and proton sponge-triggered rapid drug release for anticancer applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 116:111277. [DOI: 10.1016/j.msec.2020.111277] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 06/27/2020] [Accepted: 07/05/2020] [Indexed: 12/12/2022]
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Recent advances in polymer-based drug delivery systems for local anesthetics. Acta Biomater 2019; 96:55-67. [PMID: 31152941 DOI: 10.1016/j.actbio.2019.05.044] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 05/16/2019] [Accepted: 05/19/2019] [Indexed: 12/19/2022]
Abstract
Local anesthetics, which cause temporary loss of pain by inhibiting the transmission of nerve impulses, have been widely used in clinical practice. However, neurotoxicity and short half-lives have significantly limited their clinical applications. To overcome those barriers, numerous drug delivery systems (DDS) have been designed to encapsulate local anesthetic agents, so that large doses can be released slowly and provide analgesia over a prolonged period. So far, multiple classes of local anesthetic carriers have been investigated, with some of them already on the market. Among those, polymer-based delivery platforms are the most extensively explored, especially in the form of polymeric nanoparticle carriers. This review gives a specific focus on the most commonly used natural and synthetic polymers for local anesthetics delivery, owing to their excellent biocompatibility, biodegradability and versatility. State-of-the-art studies concerning such polymer delivery systems have been discussed in depth. We also highlight the impact of those delivery platforms as well as some key challenges that need to be overcome for their broader clinical applications. STATEMENT OF SIGNIFICANCE: Currently, local anesthetics have been widely used in clinically practices to prevent transmission of nerve impulses. However, the applications of anesthetics are greatly limited due to their neurotoxicity and short half-lives. Moreover, it is difficult to maintain frequent administrations which can cause poor compliance and serious consequences. Numerous drug delivery systems have been developed to solve those issues. In this review, we highlight the recent advances in polymer-based drug delivery systems for local anesthetics. The advantages as well as shortcomings for different types of polymer-based drug delivery systems are summarized in this paper. In the end, we also give prospects for future development of polymer drug delivery systems for anesthetics.
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Amarjargal A, Brunelli M, Fortunato G, Spano F, Kim CS, Rossi RM. On-demand drug release from tailored blended electrospun nanofibers. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.04.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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10
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Manoochehrabadi T, Sharifi Z, Yari F. Role of platelet-derived microparticles in transfer of the chemokine receptor CXCR4 to CXCR4-negative cells. Med J Islam Repub Iran 2019; 33:55. [PMID: 31456979 PMCID: PMC6708106 DOI: 10.34171/mjiri.33.55] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Indexed: 12/18/2022] Open
Abstract
Background: Membrane-derived microparticles (PMPs) are produced from platelets during activation, storage, and apoptosis. PMP can transfer some adhesion molecules such as CXCR4 to CXCR4-negative cells. In this study, the ability of PMPs to deliver CXCR4 molecule to CXCR4-null targets (Daudi, K562 and U937 cell line) was evaluated and the different concentrations of PMPs were examined to transfer CXCR4.
Methods: In this experimental study, PMPs were prepared using serial centrifugations. After confirmation of PMP with flow cytometry, PMP concentration was evaluated using the Bradford method. CXCR4-negative cell lines (1×105 cells/ml) were cultured in RPMI1640 with 10% FBS and 1% antibiotic. PMPs in 7 different concentrations were added to cell culture plates and incubated for 1 hour at 37ºc and 5% CO2. The presence of CXCR4 on cells was analyzed by flowcytometry.
Results: In this study, characterization of PMPs and cell lines were done by flow cytometry. Then, the PMPs’ ability to transfer CXCR4 to null cells (Daudi, K562 and U937 cell lines) was evaluated in 7 concentrations (10, 20, 50,125, 250, 500, 1000 μg/mL); incubation lasted for 1 hour. The best result of transferring CXCR4 by PMP was done in the concentration of 250µg/mL.
Conclusion: PMPs in different concentrations can transfer CXCR4 to target cells. Also, the increase of PMPs concentration up to 250µg/mL can increase the CXCR4 presence on null cells.
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Affiliation(s)
- Tahereh Manoochehrabadi
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran
| | - Zohreh Sharifi
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran
| | - Fatemeh Yari
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran
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Rodriguez de Anda DA, Ohannesian N, Martirosyan KS, Chew SA. Effects of solvent used for fabrication on drug loading and release kinetics of electrosprayed temozolomide-loaded PLGA microparticles for the treatment of glioblastoma. J Biomed Mater Res B Appl Biomater 2019; 107:2317-2324. [PMID: 30767394 DOI: 10.1002/jbm.b.34324] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 12/20/2018] [Accepted: 01/07/2019] [Indexed: 12/15/2022]
Abstract
Glioblastoma multiforme (GBM) is the most common and invasive form of malignant brain tumors and despite advances in surgery, radiotherapy, and chemotherapy, the survival of patients with GBM still remains poor. Temozolomide (TMZ) is the chemotherapy drug that is most commonly given orally after surgical resection of these tumors. In this study, the effects of solvents (i.e., dichloromethane and acetonitrile) used for the fabrication of electrosprayed TMZ-loaded poly(lactic-co-glycolic acid) (PLGA) on drug loading, loading efficiency, drug release kinetics, surface morphology, and particle size were investigated. The results from this study demonstrated that by using a larger volume of a solvent with higher polarity (i.e., acetonitrile) which allows for a higher amount of hydrophilic TMZ to dissolve into the polymer solution, higher drug loading could be achieved. However, the particles fabricated with high amount of acetonitrile, which has a lower vapor pressure, had large pores and a smaller diameter which led to an initial burst release and high cumulative release at the end of the study. An optimal combination of the two solvents is needed to result in particles with a good amount of loading and minimal initial burst release. The electrosprayed microparticles were able to illicit a cytotoxic response in U-87 MG glioblastoma cells at a lower concentration of drug compared to the free drug. This work indicated that electrospraying is a promising method for the fabrication of TMZ-loaded PLGA microparticles for the treatment of GBM and solvent composition can be altered to control drug loading and release kinetics. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 2317-2324, 2019.
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Affiliation(s)
- Daniel A Rodriguez de Anda
- Department of Health and Biomedical Sciences, University of Texas Rio Grande Valley, One West University Blvd., Brownsville, Texas, 78520
| | - Nareg Ohannesian
- Department of Physics and Astronomy, University of Texas Rio Grande Valley, One West University Blvd., Brownsville, Texas, 78520
| | - Karen S Martirosyan
- Department of Physics and Astronomy, University of Texas Rio Grande Valley, One West University Blvd., Brownsville, Texas, 78520
| | - Sue Anne Chew
- Department of Health and Biomedical Sciences, University of Texas Rio Grande Valley, One West University Blvd., Brownsville, Texas, 78520
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Wan F, Larsen FH, Bordallo HN, Foged C, Rantanen J, Yang M. Insight into Nanoscale Network of Spray-Dried Polymeric Particles: Role of Polymer Molecular Conformation. ACS APPLIED MATERIALS & INTERFACES 2018; 10:36686-36692. [PMID: 30211530 DOI: 10.1021/acsami.8b12475] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Poly(lactic- co-glycolic acid) (PLGA) microparticles represent a promising formulation approach for providing steady pharmacokinetic/pharmacodynamic profiles of therapeutic drugs for a long period. Understanding and controlling the supramolecular structure of PLGA microparticles at a molecular level is a prerequisite for the rational design of well-controlled, reproducible sustained-release profiles. Herein, we reveal the role of PLGA molecular conformation in particle formation and drug release. The nanoscale network of PLGA microparticles spray-dried using the solvents with distinct polarities was investigated by using NMR and neutron scattering. By employing chemometric method, we further demonstrate the evolution of nanoscale networks in spray-dried PLGA microparticles upon water absorption. Our results indicate that PLGA molecules form more chain entanglements during spray drying when using the solvents with low polarity, where PLGA molecule adopts a more flexible, extended conformation, resulting in the network being more resistant to water absorption in spray-dried PLGA microparticles. This work underlines the role of PLGA molecular conformation in controlling formation and evolution of nanoscale network of spray-dried PLGA microparticles and will have important consequences in achieving customized drug release from the PLGA microparticles.
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Affiliation(s)
- Feng Wan
- Department of Pharmacy, Faculty of Health and Medical Sciences , University of Copenhagen , Universitetsparken 2 , 2100 Copenhagen , Denmark
| | - Flemming Hofmann Larsen
- Department of Food Science, Faculty of Science , University of Copenhagen , Rolighedsvej 26 , 1958 Frederiksberg C , Denmark
| | - Heloisa Nunes Bordallo
- Niels Bohr Institute , University of Copenhagen , Blegdamsvej 17 , 2100 Copenhagen , Denmark
| | - Camilla Foged
- Department of Pharmacy, Faculty of Health and Medical Sciences , University of Copenhagen , Universitetsparken 2 , 2100 Copenhagen , Denmark
| | - Jukka Rantanen
- Department of Pharmacy, Faculty of Health and Medical Sciences , University of Copenhagen , Universitetsparken 2 , 2100 Copenhagen , Denmark
| | - Mingshi Yang
- Department of Pharmacy, Faculty of Health and Medical Sciences , University of Copenhagen , Universitetsparken 2 , 2100 Copenhagen , Denmark
- Wuya College of Innovation , Shenyang Pharmaceutical University , Wenhua Road 103 , 110016 Shenyang , China
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Shpigel T, Uziel A, Lewitus DY. SPHRINT - Printing Drug Delivery Microspheres from Polymeric Melts. Eur J Pharm Biopharm 2018; 127:398-406. [PMID: 29578074 DOI: 10.1016/j.ejpb.2018.03.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 03/11/2018] [Accepted: 03/14/2018] [Indexed: 12/13/2022]
Abstract
This paper describes a simple, straightforward, and rapid method for producing microspheres from molten polymers by merely printing them in an inkjet-like manner onto a superoleophobic surface (microsphere printing, hence SPHRINT). Similar to 3D printing, a polymer melt is deposited onto a surface; however, in contrast to 2D or 3D printing, the surface is not wetted (i.e. exhibiting high contact angles with liquids, above 150°, due to its low surface energy), resulting in the formation of discrete spherical microspheres. In this study, microspheres were printed using polycaprolactone and poly(lactic-co-glycolic acid) loaded with a model active pharmaceutical ingredient-ibuprofen (IBU). The formation of microspheres was captured by high-speed imaging and was found to involve several physical phenomena characterized by non-dimensional numbers, including the thinning and breakup of highly viscous, weakly elastic filaments, which are first to be described in pure polymer melts. The resulting IBU-loaded microspheres had higher sphericity, reproducible sizes and shapes, and superior drug encapsulation efficiencies with a distinctly high process yield (>95%) as compared to the conservative solvent-based methods used presently. Furthermore, the microspheres showed sustained release profiles.
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Affiliation(s)
- Tal Shpigel
- Plastics and Polymer Engineering Department, Shenkar College, Ramat-Gan 6262528, Israel
| | - Almog Uziel
- Plastics and Polymer Engineering Department, Shenkar College, Ramat-Gan 6262528, Israel
| | - Dan Y Lewitus
- Plastics and Polymer Engineering Department, Shenkar College, Ramat-Gan 6262528, Israel.
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Barbosa JAP, Franco ES, Silva CVNS, Bezerra TO, Santana MAN, Júnior CHRC, Silva TG, Santos NPS, Maia MBS. Poly- ε-Caprolactone Microsphere Polymers Containing Usnic Acid: Acute Toxicity and Anti-Inflammatory Activity. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2017; 2017:7392891. [PMID: 29348773 PMCID: PMC5733973 DOI: 10.1155/2017/7392891] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 10/09/2017] [Indexed: 11/17/2022]
Abstract
Usnic acid (UA) has been studied by its pharmacological properties; however, it presents moderate toxicity, low solubility, and absorption by biological membranes. The aim of this study was to develop poly-ε-caprolactone microsphere polymers containing UA (UA-micro) and evaluate their acute toxicity and anti-inflammatory activity. The microspheres were prepared by multiple emulsion technique (water/oil/water) and characterized by the encapsulation efficiency, particle size, polydispersity index, and zeta potential. The acute toxicity of UA and UA-micro (25-50 mg/kg; p.o.) was evaluated in mice. The anti-inflammatory activity of UA and UA-micro was evaluated by subcutaneous air pouch and carrageenan-induced paw edema in rat, with measurement of inflammatory cytokines and MPO levels. The UA presented encapsulation efficiency of 97.72%, particle size of 13.54 micrometers, polydispersity index of 2.36, and zeta potential of 44.5 ± 2.95 mV. The UA-micro presented lower acute toxicity (LD50 value up to 2000 mg/kg; p.o.) when compared to UA. UA-micro and UA (25 mg/kg) significantly reduced paw volume and decreased MPO levels, whereas only UA-micro (50 mg/kg) reduced significantly IL-1β, TNF-α, and NO levels in inflammatory exudate. These results suggest that controlled release systems, as microspheres, can be a promising alternative to reduce the toxicity of UA, making it a viable compound for inflammation therapy.
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Affiliation(s)
| | - Eryvelton S. Franco
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, PE, Brazil
| | - Camilla V. N. S. Silva
- Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, PE, Brazil
| | - Tatiane O. Bezerra
- Department of Antibiotics, Federal University of Pernambuco, Recife, PE, Brazil
| | | | | | - Teresinha G. Silva
- Department of Antibiotics, Federal University of Pernambuco, Recife, PE, Brazil
| | - Noemia P. S. Santos
- Laboratory of Biotechnology and Pharmaceuticals, Academic Center of Vitória, Federal University of Pernambuco, Vitória de Santo Antão, PE, Brazil
| | - Maria B. S. Maia
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, PE, Brazil
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Preventing Surgical Site Infections Using a Natural, Biodegradable, Antibacterial Coating on Surgical Sutures. Molecules 2017; 22:molecules22091570. [PMID: 28925959 PMCID: PMC6151728 DOI: 10.3390/molecules22091570] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 09/16/2017] [Indexed: 12/02/2022] Open
Abstract
Surgical site infections (SSIs) are one of the most common nosocomial infections, which can result in serious complications after surgical interventions. Foreign materials such as implants or surgical sutures are optimal surfaces for the adherence of bacteria and subsequent colonization and biofilm formation. Due to a significant increase in antibiotic-resistant bacterial strains, naturally occurring agents exhibiting antibacterial properties have great potential in prophylactic therapies. The aim of this study was to develop a coating for surgical sutures consisting of the antibacterial substance totarol, a naturally occurring diterpenoid isolated from Podocarpustotara in combination with poly(lactide-co-glycolide acid) (PLGA) as a biodegradable drug delivery system. Hence, non-absorbable monofilament and multifilament sutures were coated with solutions containing different amounts and ratios of totarol and PLGA, resulting in a smooth, crystalline coating. Using an agar diffusion test (ADT), it became evident that the PLGA/totarol-coated sutures inhibited the growth of Staphylococcus aureus over a period of 15 days. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay showed that the coated sutures were not cytotoxic to murine fibroblasts. Overall, the data indicates that our innovative, biodegradable suture coating has the potential to reduce the risk of SSIs and postoperative biofilm-formation on suture material without adverse effects on tissue.
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Reinbold J, Hierlemann T, Urich L, Uhde AK, Müller I, Weindl T, Vogel U, Schlensak C, Wendel HP, Krajewski S. Biodegradable rifampicin-releasing coating of surgical meshes for the prevention of bacterial infections. DRUG DESIGN DEVELOPMENT AND THERAPY 2017; 11:2753-2762. [PMID: 29075100 PMCID: PMC5609798 DOI: 10.2147/dddt.s138510] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Polypropylene mesh implants are routinely used to repair abdominal wall defects or incisional hernia. However, complications associated with mesh implantation, such as mesh-related infections, can cause serious problems and may require complete surgical removal. Hence, the aim of the present study was the development of a safe and efficient coating to reduce postoperative mesh infections. Biodegradable poly(lactide-co-glycolide acid) microspheres loaded with rifampicin as an antibacterial agent were prepared through single emulsion evaporation method. The particle size distribution (67.93±3.39 μm for rifampicin-loaded microspheres and 64.43±3.61 μm for unloaded microspheres) was measured by laser diffraction. Furthermore, the encapsulation efficiency of rifampicin (61.5%±2.58%) was detected via ultraviolet–visible (UV/Vis) spectroscopy. The drug release of rifampicin-loaded microspheres was detected by UV/Vis spectroscopy over a period of 60 days. After 60 days, 92.40%±3.54% of the encapsulated rifampicin has been continuously released. The viability of BJ fibroblasts after incubation with unloaded and rifampicin-loaded microspheres was investigated using an MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay, which showed no adverse effects on the cells. Furthermore, the antibacterial impact of rifampicin-loaded microspheres and mesh implants, coated with the antibacterial microspheres, was investigated using an agar diffusion model with Staphylococcus aureus. The coated mesh implants were also tested in an in vivo mouse model of staphylococcal infection and resulted in a 100% protection against mesh implant infections or biofilm formation shown by macroscopic imaging, scanning electron microscopy, and histological examinations. This effective antibacterial mesh coating combining the benefit of a controlled drug delivery system and a potent antibacterial agent possesses the ability to significantly reduce postoperative implant infections.
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Affiliation(s)
- Jochen Reinbold
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen
| | - Teresa Hierlemann
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen
| | - Lukas Urich
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen
| | - Ann-Kristin Uhde
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen
| | - Ingrid Müller
- Department of Pharmaceutical Engineering, Albstadt-Sigmaringen University of Applied Science, Albstadt
| | | | - Ulrich Vogel
- Institute of Pathology and Neuropathology, Tübingen, Germany
| | - Christian Schlensak
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen
| | - Hans Peter Wendel
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen
| | - Stefanie Krajewski
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tübingen, Tübingen
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van Beers MM, Slooten C, Meulenaar J, Sediq AS, Verrijk R, Jiskoot W. Micro-Flow Imaging as a quantitative tool to assess size and agglomeration of PLGA microparticles. Eur J Pharm Biopharm 2017; 117:91-104. [DOI: 10.1016/j.ejpb.2017.04.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 04/05/2017] [Indexed: 01/03/2023]
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18
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Kim S, Requejo KI, Nakamatsu J, Gonzales KN, Torres FG, Cavaco-Paulo A. Modulating antioxidant activity and the controlled release capability of laccase mediated catechin grafting of chitosan. Process Biochem 2017. [DOI: 10.1016/j.procbio.2016.12.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Moradkhani MR, Karimi A, Negahdari B. Nanotechnology application to local anaesthesia (LA). ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2017; 46:355-360. [PMID: 28395522 DOI: 10.1080/21691401.2017.1313263] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Several advancements have been made on the exact release of local anaesthetics formulation and its efficiency at inducing motor and sensory block for an extended time has been harnessed in clinical practice. The use of sustained release formulations delivers analgesia for a lengthier period of time with one administration, thereby reducing complications that usually arise with administration of conventional analgesia. In addition, controlled release of an anaesthetic drug is said to prevent overdosing, reduced side effects, especially cardiotoxicity, neurotoxicity and tissue lesions. The use of nanotechnology knowledge via liposomal formulation has recorded high successful results in pain control and quick patient recovery.
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Affiliation(s)
- Mahmoud Reza Moradkhani
- a Department of Anesthesiology , Lorestan University of Medical Sciences , Khorramabad , Iran
| | - Arash Karimi
- a Department of Anesthesiology , Lorestan University of Medical Sciences , Khorramabad , Iran
| | - Babak Negahdari
- b Department of Medical Biotechnology , School of Advanced Technologies in Medicine, Tehran University of Medical Sciences , Tehran , Iran
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20
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Yang M, Dong Z, Zhang Y, Zhang F, Wang Y, Zhao Z. Preparation and evaluation of posaconazole-loaded enteric microparticles in rats. Drug Dev Ind Pharm 2017; 43:618-627. [PMID: 28005452 DOI: 10.1080/03639045.2016.1275667] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVES Posaconazole (POS) is an antifungal compound which has a low oral bioavailability. The aim of this study was to prepare POS enteric microparticles to enhance its oral bioavailability. METHODS POS enteric microparticles were prepared with hypromellose acetate succinate (HPMCAS) via the spray drying method. The solvent mixtures of acetone and ethanol used in the preparation of the microparticles were optimized to produce the ideal POS enteric microparticles. Multivariate data analysis using a principal component analysis (PCA) was used to find the relationship among the HPMCAS molecular characteristics, particle properties and drug release kinetics from the spray dried microparticles. KEY FINDINGS The optimal spray solvent mixtures were critical to produce the POS microparticles with the defined polymer entanglement index, drug surface enrichment, particle size and drug loading. The HPMCAS molecular characteristics affected the microscopic connectivity and diffusivity of polymer matrix and eventually influenced the drug release behavior, and enhanced the bioavailability of POS. CONCLUSIONS These studies suggested that the selection of suitable solvent mixtures of acetone and ethanol used in the spray drying of the microparticles was quite important to produce the entangled polymer structures with preferred polymer molecular properties of polymer coiling, overlap concentration and entanglement index. Additional studies on particle size and surface drug enrichment eventually produced HPMCAS-based enteric microparticles to enhance the oral bioavailability of POS.
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Affiliation(s)
- Min Yang
- a School of Pharmaceutical Sciences , Shandong University , Jinan , Shandong , PR China
| | - Zhonghua Dong
- a School of Pharmaceutical Sciences , Shandong University , Jinan , Shandong , PR China
| | - Yongchun Zhang
- a School of Pharmaceutical Sciences , Shandong University , Jinan , Shandong , PR China
| | - Fang Zhang
- a School of Pharmaceutical Sciences , Shandong University , Jinan , Shandong , PR China
| | - Yongjie Wang
- a School of Pharmaceutical Sciences , Shandong University , Jinan , Shandong , PR China
| | - Zhongxi Zhao
- a School of Pharmaceutical Sciences , Shandong University , Jinan , Shandong , PR China.,b Shandong Engineering & Technology Research Center for Jujube Food and Drug , Jinan , Shandong , PR China.,c Shandong Provincial Key Laboratory of Mucosal and Transdermal Drug Delivery Technologies , Shandong Academy of Pharmaceutical Sciences , Jinan , Shandong , PR China
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21
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Gasmi H, Siepmann F, Hamoudi M, Danede F, Verin J, Willart JF, Siepmann J. Towards a better understanding of the different release phases from PLGA microparticles: Dexamethasone-loaded systems. Int J Pharm 2016; 514:189-199. [DOI: 10.1016/j.ijpharm.2016.08.032] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 08/03/2016] [Accepted: 08/15/2016] [Indexed: 02/03/2023]
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22
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Reinbold J, Hierlemann T, Hinkel H, Müller I, Maier ME, Weindl T, Schlensak C, Wendel HP, Krajewski S. Development and in vitro characterization of poly(lactide- co-glycolide) microspheres loaded with an antibacterial natural drug for the treatment of long-term bacterial infections. DRUG DESIGN DEVELOPMENT AND THERAPY 2016; 10:2823-2832. [PMID: 27660414 PMCID: PMC5019313 DOI: 10.2147/dddt.s105367] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Biodegradable polymers, especially poly(lactide-co-glycolide) (PLGA), have good biocompatibility and toxicological properties. In combination with active ingredients, a specialized drug delivery system can be generated. The aim of the present study was to develop a drug delivery system consisting of PLGA microspheres loaded with the natural active ingredient totarol, which has several antimicrobial mechanisms. Totarol, isolated from the Podocarpus totara tree, was purified using column chromatography, and the eluate was checked for purity using thin layer chromatography. The spherically shaped microspheres with mean diameters of 147.21±3.45 µm and 131.14±3.69 µm (totarol-loaded and -unloaded microspheres, respectively) were created using the single emulsion evaporation method. Furthermore, the encapsulation efficiency, in a range of 84.72%±6.68% to 92.36%±0.99%, was measured via UV/vis spectroscopy. In a 90-day in vitro drug release study, the release of totarol was investigated by UV/vis spectroscopy as well, showing a release of 53.76%. The toxicity on cells was determined using BJ fibroblasts or Human Embryonic Kidney cells and an 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, which showed no influence on the cell growth. The minimal inhibitory concentration was ascertained. A totarol concentration between 64 µg/mL and 128 µg/mL was necessary to inhibit the bacterial growth over a period of 24 hours. Biofilm formation on the surface of totarol-loaded microspheres was determined using transmission electron microscopy. No biofilm formation could be detected, even if the totarol concentration was below the minimal inhibitory concentration. The hemocompatibility investigations on various markers with fresh heparinized blood (1.5 IU/mL) showed that totarol and totarol-loaded microspheres have no influence on different blood parameters. The PLGA microspheres characterized by slow release of totarol and great entrapment efficiency represent a novel drug delivery system, which may be highly beneficial for the long-term therapy of bacterial infections.
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Affiliation(s)
- Jochen Reinbold
- Department of Thoracic, Cardiac and Vascular Surgery, University Hospital Tuebingen, Tuebingen
| | - Teresa Hierlemann
- Department of Thoracic, Cardiac and Vascular Surgery, University Hospital Tuebingen, Tuebingen
| | - Helena Hinkel
- Department of Thoracic, Cardiac and Vascular Surgery, University Hospital Tuebingen, Tuebingen
| | - Ingrid Müller
- Department of Pharmaceutical Engineering, Albstadt-Sigmaringen University, Sigmaringen
| | - Martin E Maier
- Institute of Organic Chemistry, University Tuebingen, Tuebingen
| | | | - Christian Schlensak
- Department of Thoracic, Cardiac and Vascular Surgery, University Hospital Tuebingen, Tuebingen
| | - Hans Peter Wendel
- Department of Thoracic, Cardiac and Vascular Surgery, University Hospital Tuebingen, Tuebingen
| | - Stefanie Krajewski
- Department of Thoracic, Cardiac and Vascular Surgery, University Hospital Tuebingen, Tuebingen
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23
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Subedi G, Shrestha AK, Shakya S. Study of Effect of Different Factors in Formulation of Micro and Nanospheres with Solvent Evaporation Technique. ACTA ACUST UNITED AC 2016. [DOI: 10.2174/1874844901603010182] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Background:
There are various methods of formulation of micro and nanospheres such as solvent evaporation, solvent removal, polymerization, hot-melt encapsulation, coacervation, phase/wet inversion, spray drying, spray congealing etc. Amongst these all, solvent evaporation is one of the most widely used, researched, easy, accessible methods and for which many patents have been applied. It is thus imperative to understand the basics of effect of formulation variables and design of solvent evaporation method which will be covered in this review article.
Objective:
To discuss the various formulation factors while designing the robust micro and nanospherical systems with better morphology, entrapment and release of the drugs.
Method:
Systematic analysis of the relevant literature, bibliographies, and interactions with investigators.
Results:
From the investigation of different literatures, it was found that various factors of solvent evaporation technique may be controlled in order to design the micro and nanospheres of suitable morphology, entrapment and release characters.
Conclusion:
Various factors like type of polymer used, weight, viscosity, hydrophilicity, concentration, polymer ratio, stirring speed, emulsifier concentration, concentration of cross-linking agents, type of solvent used, rate of addition of solvent etc. Affect the yield, morphology, release and entrapment of the drug inside the system. Hence, these factors play crucial role in the design of a robust micro and nanospherical system.
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24
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Zorzetto L, Brambilla P, Marcello E, Bloise N, De Gregori M, Cobianchi L, Peloso A, Allegri M, Visai L, Petrini P. From micro- to nanostructured implantable device for local anesthetic delivery. Int J Nanomedicine 2016; 11:2695-709. [PMID: 27354799 PMCID: PMC4907738 DOI: 10.2147/ijn.s99028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Local anesthetics block the transmission of painful stimuli to the brain by acting on ion channels of nociceptor fibers, and find application in the management of acute and chronic pain. Despite the key role they play in modern medicine, their cardio and neurotoxicity (together with their short half-life) stress the need for developing implantable devices for tailored local drug release, with the aim of counterbalancing their side effects and prolonging their pharmacological activity. This review discusses the evolution of the physical forms of local anesthetic delivery systems during the past decades. Depending on the use of different biocompatible materials (degradable polyesters, thermosensitive hydrogels, and liposomes and hydrogels from natural polymers) and manufacturing processes, these systems can be classified as films or micro- or nanostructured devices. We analyze and summarize the production techniques according to this classification, focusing on their relative advantages and disadvantages. The most relevant trend reported in this work highlights the effort of moving from microstructured to nanostructured systems, with the aim of reaching a scale comparable to the biological environment. Improved intracellular penetration compared to microstructured systems, indeed, provides specific drug absorption into the targeted tissue and can lead to an enhancement of its bioavailability and retention time. Nanostructured systems are realized by the modification of existing manufacturing processes (interfacial deposition and nanoprecipitation for degradable polyester particles and high- or low-temperature homogenization for liposomes) or development of novel strategies (electrospun matrices and nanogels). The high surface-to-volume ratio that characterizes nanostructured devices often leads to a burst drug release. This drawback needs to be addressed to fully exploit the advantage of the interaction between the target tissues and the drug: possible strategies could involve specific binding between the drug and the material chosen for the device, and a multiscale approach to reach a tailored, prolonged drug release.
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Affiliation(s)
- Laura Zorzetto
- Department of Chemistry, Materials and Chemical Engineering 'G. Natta', Politecnico di Milano, Milan, Italy
| | - Paola Brambilla
- Department of Chemistry, Materials and Chemical Engineering 'G. Natta', Politecnico di Milano, Milan, Italy
| | - Elena Marcello
- Department of Chemistry, Materials and Chemical Engineering 'G. Natta', Politecnico di Milano, Milan, Italy
| | - Nora Bloise
- Department of Molecular Medicine, Centre for Health Technologies (CHT), INSTM UdR of Pavia, University of Pavia, Pavia, Italy
| | - Manuela De Gregori
- Pain Therapy Service, IRCCS Foundation Policlinico San Matteo Pavia, Pavia, Italy
| | - Lorenzo Cobianchi
- General Surgery Department, IRCCS Foundation Policlinico San Matteo, Pavia, Italy; Departments of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy
| | - Andrea Peloso
- General Surgery Department, IRCCS Foundation Policlinico San Matteo, Pavia, Italy; Departments of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy
| | - Massimo Allegri
- Department of Surgical Sciences, University of Parma, Parma, Italy
| | - Livia Visai
- Department of Molecular Medicine, Centre for Health Technologies (CHT), INSTM UdR of Pavia, University of Pavia, Pavia, Italy; Department of Occupational Medicine, Toxicology and Environmental Risks, S. Maugeri Foundation, IRCCS, Lab of Nanotechnology, Pavia, Italy
| | - Paola Petrini
- Department of Chemistry, Materials and Chemical Engineering 'G. Natta', Politecnico di Milano, Milan, Italy
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Gasmi H, Willart JF, Danede F, Hamoudi M, Siepmann J, Siepmann F. Importance of PLGA microparticle swelling for the control of prilocaine release. J Drug Deliv Sci Technol 2015. [DOI: 10.1016/j.jddst.2015.10.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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26
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Do MP, Neut C, Metz H, Delcourt E, Siepmann J, Mäder K, Siepmann F. Mechanistic analysis of PLGA/HPMC-based in-situ forming implants for periodontitis treatment. Eur J Pharm Biopharm 2015; 94:273-83. [PMID: 26047797 DOI: 10.1016/j.ejpb.2015.05.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Revised: 04/28/2015] [Accepted: 05/21/2015] [Indexed: 11/20/2022]
Abstract
In-situ forming implant formulations based on poly(lactic-co-glycolic acid) (PLGA), acetyltributyl citrate (ATBC), minocycline HCl, N-methyl pyrrolidone (NMP) and optionally hydroxypropyl methylcellulose (HPMC) were prepared and thoroughly characterized in vitro. This includes electron paramagnetic resonance (EPR), nuclear magnetic resonance ((1)H NMR), mass change and drug release measurements under different conditions, optical microscopy, size exclusion chromatography (SEC) as well as antibacterial activity tests using gingival crevicular fluid samples from periodontal pockets of periodontitis patients. Based on these results, deeper insight into the physico-chemical phenomena involved in implant formation and the control of drug release could be gained. For instance, the effects of adding HPMC to the formulations, resulting in improved implant adherence and reduced swelling, could be explained. Importantly, the in-situ formed implants effectively hindered the growth of bacteria present in the patients' periodontal pockets. Interestingly, the systems were more effectively hindering the growth of pathogenic bacterial strains (e.g., Fusobacterium nucleatum) than that of strains with a lower pathogenic potential (e.g., Streptococcus salivarius). In vivo, such a preferential action against the pathogenic bacteria can be expected to give a chance to the healthy flora to re-colonize the periodontal pockets.
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Affiliation(s)
- M P Do
- University of Lille, College of Pharmacy, 3 Rue du Prof. Laguesse, 59006 Lille, France; INSERM U 1008, Controlled Drug Delivery Systems and Biomaterials, 3 Rue du Prof. Laguesse, 59006 Lille, France
| | - C Neut
- University of Lille, College of Pharmacy, 3 Rue du Prof. Laguesse, 59006 Lille, France; INSERM U 995, Inflammatory Bowel Diseases, 3 Rue du Prof. Laguesse, 59006 Lille, France
| | - H Metz
- Martin-Luther-University Halle-Wittenberg, Department of Pharmaceutics and Biopharmaceutics, Halle/Saale, Germany
| | - E Delcourt
- INSERM U 1008, Controlled Drug Delivery Systems and Biomaterials, 3 Rue du Prof. Laguesse, 59006 Lille, France; University of Lille, School of Dentistry, Place de Verdun, 59000 Lille, France
| | - J Siepmann
- University of Lille, College of Pharmacy, 3 Rue du Prof. Laguesse, 59006 Lille, France; INSERM U 1008, Controlled Drug Delivery Systems and Biomaterials, 3 Rue du Prof. Laguesse, 59006 Lille, France
| | - K Mäder
- Martin-Luther-University Halle-Wittenberg, Department of Pharmaceutics and Biopharmaceutics, Halle/Saale, Germany
| | - F Siepmann
- University of Lille, College of Pharmacy, 3 Rue du Prof. Laguesse, 59006 Lille, France; INSERM U 1008, Controlled Drug Delivery Systems and Biomaterials, 3 Rue du Prof. Laguesse, 59006 Lille, France.
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Surface modification of PLGA nanoparticles by carbopol to enhance mucoadhesion and cell internalization. Colloids Surf B Biointerfaces 2015; 130:229-36. [DOI: 10.1016/j.colsurfb.2015.04.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 04/06/2015] [Accepted: 04/08/2015] [Indexed: 11/18/2022]
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28
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Wan F, Wu JX, Bohr A, Baldursdottir SG, Maltesen MJ, Bjerregaard S, Foged C, Rantanen J, Yang M. Impact of PLGA molecular behavior in the feed solution on the drug release kinetics of spray dried microparticles. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.08.044] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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29
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Siepmann J. In-silico simulations of advanced drug delivery systems: What will the future offer? Int J Pharm 2013; 454:512-6. [DOI: 10.1016/j.ijpharm.2013.07.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Accepted: 03/20/2013] [Indexed: 10/26/2022]
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30
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Jianbo G, Xue L, Hongdan Y, Zhaohui T, Xing T, Chenchen C, Jinghua X, Hui X. The Anti-Melanoma Efficiency of the Intratumoral Injection of Cucurbitacin-Loaded Sustained-Release Carriers: A PLGA Particle System. J Pharm Sci 2013; 102:2550-63. [DOI: 10.1002/jps.23604] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Revised: 04/06/2013] [Accepted: 04/23/2013] [Indexed: 11/11/2022]
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31
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Potential of biodegradable microneedles as a transdermal delivery vehicle for lidocaine. Biotechnol Lett 2013; 35:1351-63. [DOI: 10.1007/s10529-013-1217-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 05/01/2013] [Indexed: 12/16/2022]
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32
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Gaignaux A, Réeff J, De Vriese C, Goole J, Amighi K. Evaluation of the degradation of clonidine-loaded PLGA microspheres. J Microencapsul 2013; 30:681-91. [PMID: 23544878 DOI: 10.3109/02652048.2013.778905] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONTEXT The release of an encapsulated drug is dependent on diffusion and/or degradation/erosion processes. OBJECTIVE This work aimed to better understand the degradation mechanism of clonidine-loaded microparticles. METHODS Gel permeation chromatography was used to evaluate the degradation of the polymer. The water-uptake and the weight loss were determined gravimetrically. The swelling behaviour and the morphological changes of the formulations were observed by microscopy. The glass transition temperature and the crystallinity were also determined by differential scanning calorimetry and X-ray diffraction, respectively. The pH of the medium and inside the microspheres was assessed. RESULTS The microspheres captured a large amount of water, allowing a decrease in the molecular weight of the polymer. The pH of the medium decreased after release of the degradation products and the pH inside the microparticles remained constant due to the neutralization of these acidic products. CONCLUSION Clonidine and buffers both had an action on the degradation.
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Affiliation(s)
- Amélie Gaignaux
- Laboratory of Pharmaceutics and Biopharmaceutics, Université Libre de Bruxelles , City of Brussels , Belgium
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Preparation and Characterization of Poly(ε-Caprolactone) Nanospheres Containing the Local Anesthetic Lidocaine. J Pharm Sci 2013; 102:215-26. [DOI: 10.1002/jps.23350] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2012] [Revised: 09/04/2012] [Accepted: 10/05/2012] [Indexed: 11/07/2022]
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34
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Impact of the experimental conditions on drug release from parenteral depot systems: From negligible to significant. Int J Pharm 2012; 432:11-22. [DOI: 10.1016/j.ijpharm.2012.04.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Revised: 04/11/2012] [Accepted: 04/21/2012] [Indexed: 11/24/2022]
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35
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Ito F, Takahashi T, Kanamura K, Kawakami H. Possibility for the development of cosmetics with PLGA nanospheres. Drug Dev Ind Pharm 2012; 39:752-61. [DOI: 10.3109/03639045.2012.696653] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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36
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Enhanced Endothelialization of a New Stent Polymer Through Surface Enhancement and Incorporation of Growth Factor-Delivering Microparticles. J Cardiovasc Transl Res 2012; 5:519-27. [DOI: 10.1007/s12265-012-9381-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Accepted: 05/17/2012] [Indexed: 11/26/2022]
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37
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Wang L, Wang A, Zhao X, Liu X, Wang D, Sun F, Li Y. Design of a long-term antipsychotic in situ forming implant and its release control method and mechanism. Int J Pharm 2012; 427:284-92. [DOI: 10.1016/j.ijpharm.2012.02.015] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 01/18/2012] [Accepted: 02/09/2012] [Indexed: 01/18/2023]
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38
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Singh V, Singh S, Das S, Kumar A, Self WT, Seal S. A facile synthesis of PLGA encapsulated cerium oxide nanoparticles: release kinetics and biological activity. NANOSCALE 2012; 4:2597-2605. [PMID: 22419352 DOI: 10.1039/c2nr12131j] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In the present article a facile synthesis of cerium oxide nanoparticles (CNPs) encapsulated in PLGA microparticles is reported. The release kinetics of the CNPs from the PLGA matrix was investigated under acidic, basic and near-neutral pH. A diffusion model was applied to determine the diffusivity of the CNPs from the PLGA matrix. The morphology of the degraded PLGA particles was characterized by high resolution SEM. Superoxide dismutase (SOD) mimetic activity was retained in released CNPs for a longer period of time (∼90 days) under different pH. PLGA encapsulated CNP showed excellent biocompatibility. This study demonstrates a potential strategy to deliver CNPs using biodegradable PLGA that ensures a slow release of the CNPs over a long period of time. Thus, the synthesized PLGA encapsulated CNPs could find potential applications in tissue engineering like bone remodelling and regeneration, and protection from disorders caused by neurodegeneration.
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Affiliation(s)
- Virendra Singh
- Mechanical Materials and Aerospace Engineering, Nanoscience and Technology Center, Advanced Materials Processing and Analysis Center, University of Central Florida, USA
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39
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Schoubben A, Blasi P, Deluca PP. Effect of Agitation Regimen on the in vitro Release of Leuprolide from Poly(Lactic-Co-Glycolic) Acid Microparticles. J Pharm Sci 2012; 101:1212-20. [DOI: 10.1002/jps.23029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Revised: 11/29/2011] [Accepted: 12/02/2011] [Indexed: 11/10/2022]
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40
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Murphy C, Pillay V, Choonara YE, du Toit LC, Ndesendo VMK, Chirwa N, Kumar P. Optimization of a dual mechanism gastrofloatable and gastroadhesive delivery system for narrow absorption window drugs. AAPS PharmSciTech 2012; 13:1-15. [PMID: 22048877 DOI: 10.1208/s12249-011-9711-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Accepted: 10/06/2011] [Indexed: 02/07/2023] Open
Abstract
In order to overcome poor bioavailability of narrow absorption window drugs, a gastrosphere system comprising two mechanisms of gastric retention, namely buoyancy and gastroadhesion, has been investigated in this study employing poly(lactic-co-glycolic acid) (PLGA), polyacrylic acid (PAA), alginate, pectin, and a model drug metformin hydrochloride. Fifteen formulations were obtained using a Box-Behnken statistical design. The gastrosphere yield was above 80% in all cases; however, due to the high water solubility of metformin, drug entrapment efficacy was between 18% and 54%. Mean dissolution time and gastroadhesive strength were used as the formulation responses in order to optimize the formulation. Furthermore, the molecular mechanics force field simulations were performed to corroborate the experimental findings. Drug release profiles revealed three different release kinetics, namely, burst, first-order and zero-order release. Varying gastroadhesive results were obtained, and were highly sensitive to changes in polymer concentrations. FTIR revealed that strong bonds of PAA and PLGA were retained within the gastrosphere. Surface area and porosity analysis provided supporting evidence that the lyophilization process resulted in a significant increase in the porosity. Analysis of the surface morphology by SEM revealed that air pockets were spread over the entire surface of the gastrosphere, providing a visual proof of the high porosity and hence low density of the gastrosphere. The spatial disposition and energetic profile of the sterically constrained and geometrically optimized multi-polymeric complex of alginate, pectin, PAA, and PLGA corroborated the experimental results in terms of in vitro drug release and gastroadhesive strength of the fabricated gastrospheres.
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41
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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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42
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Song X, Song SK, Zhao P, Wei LM, Jiao HS. β-methasone-containing biodegradable poly(lactide-co-glycolide) acid microspheres for intraarticular injection: effect of formulation parameters on characteristics andin vitrorelease. Pharm Dev Technol 2012; 18:1220-9. [DOI: 10.3109/10837450.2011.635152] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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43
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Shen J, Burgess DJ. Accelerated in vitro release testing of implantable PLGA microsphere/PVA hydrogel composite coatings. Int J Pharm 2012; 422:341-8. [PMID: 22016033 PMCID: PMC3246580 DOI: 10.1016/j.ijpharm.2011.10.020] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2011] [Revised: 10/06/2011] [Accepted: 10/07/2011] [Indexed: 12/25/2022]
Abstract
Dexamethasone loaded poly(lactic-co-glycolic acid) (PLGA) microsphere/PVA hydrogel composites have been investigated as an outer drug-eluting coating for implantable devices such as glucose sensors to counter negative tissue responses to implants. The objective of this study was to develop a discriminatory, accelerated in vitro release testing method for this drug-eluting coating using United States Pharmacopeia (USP) apparatus 4. Polymer degradation and drug release kinetics were investigated under "real-time" and accelerated conditions (i.e. extreme pH, hydro-alcoholic solutions and elevated temperatures). Compared to "real-time" conditions, the initial burst and lag phases were similar using hydro-alcoholic solutions and extreme pH conditions, while the secondary apparent zero-order release phase was slightly accelerated. Elevated temperatures resulted in a significant acceleration of dexamethasone release. The accelerated release data were able to predict "real-time" release when applying the Arrhenius equation. Microsphere batches with faster and slower release profiles were investigated under "real-time" and elevated temperature (60°C) conditions to determine the discriminatory ability of the method. The results demonstrated both the feasibility and the discriminatory ability of this USP apparatus 4 method for in vitro release testing of drug loaded PLGA microsphere/PVA hydrogel composites. This method may be appropriate for similar drug/device combination products and drug delivery systems.
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Affiliation(s)
- Jie Shen
- Department of Pharmaceutical Sciences, University of Connecticut, 69 N Eagleville Rd Unit 3092, Storrs, CT 06269, United States
- School of Pharmacy, Fudan University, Shanghai, 826 Zhangheng Road, Shanghai 201203, P.R. China
| | - Diane J. Burgess
- Department of Pharmaceutical Sciences, University of Connecticut, 69 N Eagleville Rd Unit 3092, Storrs, CT 06269, United States
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44
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Ren X, Zheng N, Gao Y, Chen T, Lu W. Biodegradable three-dimension micro-device delivering 5-fluorouracil in tumor bearing mice. Drug Deliv 2012; 19:36-44. [DOI: 10.3109/10717544.2011.635720] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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45
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Severino P, Santana MHA, Pinho SC, Souto EB. Polímeros sintéticos biodegradáveis: matérias-primas e métodos de produção de micropartículas para uso em drug delivery e liberação controlada. POLIMEROS 2011. [DOI: 10.1590/s0104-14282011005000060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Micropartículas produzidas a partir de polímeros sintéticos têm sido amplamente utilizadas na área farmacêutica para encapsulação de princípios ativos. Essas micropartículas apresentam as vantagens de proteção do princípio ativo, mucoadesão e gastrorresistência, melhor biodisponibilidade e maior adesão do paciente ao tratamento. Além disso, utiliza menores quantidade de princípio ativo para obtenção do efeito terapêutico proporcionando diminuição dos efeitos adversos locais, sistêmicos e menor toxidade. Os polímeros sintéticos empregados na produção das micropartículas são classificados biodegradáveis ou não biodegradáveis, sendo os biodegradáveis mais utilizados por não necessitam ser removidos cirurgicamente após o término de sua ação. A produção das micropartículas poliméricas sintéticas para encapsulação tanto de ativos hidrofílicos quanto hidrofóbicos pode ser emulsificação por extração e/ou evaporação do solvente; coacervação; métodos mecânicos e estão revisados neste artigo evidenciando as vantagens, desvantagens e viabilidade de cada metodologia. A escolha da metodologia e do polímero sintético a serem empregados na produção desse sistema dependem da aplicação terapêutica requerida, bem como a simplicidade, reprodutibilidade e factibilidade do aumento de escala da produção.
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46
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Lu F, Lei L, Shen YY, Hou JW, Chen WL, Li YG, Guo SR. Effects of amphiphilic PCL–PEG–PCL copolymer addition on 5-fluorouracil release from biodegradable PCL films for stent application. Int J Pharm 2011; 419:77-84. [DOI: 10.1016/j.ijpharm.2011.07.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Revised: 06/14/2011] [Accepted: 07/14/2011] [Indexed: 11/16/2022]
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47
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Tamariz E, Wan ACA, Pek YS, Giordano M, Hernández-Padrón G, Varela-Echavarría A, Velasco I, Castaño VM. Delivery of chemotropic proteins and improvement of dopaminergic neuron outgrowth through a thixotropic hybrid nano-gel. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:2097-2109. [PMID: 21744103 DOI: 10.1007/s10856-011-4385-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Accepted: 06/25/2011] [Indexed: 05/31/2023]
Abstract
Chemotropic proteins guide neuronal projections to their final target during embryo development and are useful to guide axons of neurons used in transplantation therapies. Site-specific delivery of the proteins however is needed for their application in the brain to avoid degradation and pleiotropic affects. In the present study we report the use of Poly (ethylene glycol)-Silica (PEG-Si) nanocomposite gel with thixotropic properties that make it injectable and suitable for delivery of the chemotropic protein semaphorin 3A. PEG-Si gel forms a functional gradient of semaphorin that enhances axon outgrowth of dopaminergic neurons from rat embryos or differentiated from stem cells in culture. It is not cytotoxic and its properties allowed its injection into the striatum without inflammatory response in the short term. Long term implantation however led to an increase in macrophages and glial cells. The inflammatory response could have resulted from non-degraded silica particles, as observed in biodegradation assays.
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Affiliation(s)
- Elisa Tamariz
- Instituto de Ciencias de la Salud, Universidad Veracruzana, Xalapa, VER, México.
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48
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Pang J, Luan Y, Li F, Cai X, Du J, Li Z. Ibuprofen-loaded poly(lactic-co-glycolic acid) films for controlled drug release. Int J Nanomedicine 2011; 6:659-65. [PMID: 21674021 PMCID: PMC3107723 DOI: 10.2147/ijn.s17011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Indexed: 12/01/2022] Open
Abstract
Ibuprofen- (IBU) loaded biocompatible poly(lactic-co-glycolic acid) (PLGA) films were prepared by spreading polymer/ibuprofen solution on the nonsolvent surface. By controlling the weight ratio of drug and polymer, different drug loading polymer films can be obtained. The synthesized ibuprofen-loaded PLGA films were characterized with scanning electron microscopy, powder X-ray diffraction, and differential scanning calorimetry. The drug release behavior of the as-prepared IBU-loaded PLGA films was studied to reveal their potential application in drug delivery systems. The results show the feasibility of the as-obtained films for controlling drug release. Furthermore, the drug release rate of the film could be controlled by the drug loading content and the release medium. The development of a biodegradable ibuprofen system, based on films, should be of great interest in drug delivery systems.
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Affiliation(s)
- Jianmei Pang
- School of Pharmaceutical Science, Shandong University, Jinan, Shandong Province, PR China
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49
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Naeem Aamir M, Ahmad M, Akhtar N, Murtaza G, Khan SA, Shahiq-uz-Zaman, Nokhodchi A. Development and in vitro–in vivo relationship of controlled-release microparticles loaded with tramadol hydrochloride. Int J Pharm 2011; 407:38-43. [DOI: 10.1016/j.ijpharm.2011.01.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 12/23/2010] [Accepted: 01/06/2011] [Indexed: 11/26/2022]
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50
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Chen Y, Zhou S, Li Q. Mathematical modeling of degradation for bulk-erosive polymers: applications in tissue engineering scaffolds and drug delivery systems. Acta Biomater 2011; 7:1140-9. [PMID: 20937415 DOI: 10.1016/j.actbio.2010.09.038] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2010] [Revised: 09/07/2010] [Accepted: 09/28/2010] [Indexed: 11/19/2022]
Abstract
The degradation of polymeric biomaterials, which are widely exploited in tissue engineering and drug delivery systems, has drawn significant attention in recent years. This paper aims to develop a mathematical model that combines stochastic hydrolysis and mass transport to simulate the polymeric degradation and erosion process. The hydrolysis reaction is modeled in a discrete fashion by a fundamental stochastic process and an additional autocatalytic effect induced by the local carboxylic acid concentration in terms of the continuous diffusion equation. Illustrative examples of microparticles and tissue scaffolds demonstrate the applicability of the model. It is found that diffusive transport plays a critical role in determining the degradation pathway, whilst autocatalysis makes the degradation size dependent. The modeling results show good agreement with experimental data in the literature, in which the hydrolysis rate, polymer architecture and matrix size actually work together to determine the characteristics of the degradation and erosion processes of bulk-erosive polymer devices. The proposed degradation model exhibits great potential for the design optimization of drug carriers and tissue scaffolds.
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Affiliation(s)
- Yuhang Chen
- School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW 2006, Australia
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