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Baroudi A, García-Payo C, Khayet M. Chitosan-Based Composite Membranes with Different Biocompatible Metal Oxide Nanoparticles: Physicochemical Properties and Drug-Release Study. Polymers (Basel) 2023; 15:2804. [PMID: 37447450 DOI: 10.3390/polym15132804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/19/2023] [Accepted: 06/20/2023] [Indexed: 07/15/2023] Open
Abstract
Chitosan (CS) composite membranes were prepared using different biocompatible metal oxide nanoparticles (NPs): titanium dioxide (TiO2); iron oxide (Fe3O4); and aluminum oxide (Al2O3). For each nanoparticle, the CS-based composite membranes were prepared with two NPs contents in the CS solution, high (H) and low (L) NPs concentrations. To establish both concentrations, the NPs saturation point in the CS polymeric matrix was determined. The influence of NP concentrations on the physicochemical properties of the CS films was assessed. The prepared CS membranes were characterized with different techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and zeta potential. It was found that the addition of NPs in the CS matrix improved both swelling and mechanical properties. Nanocomposite CS membranes could be prepared using Al2O3 NPs. Swelling experiments revealed different pH-sensitive mechanisms, which might be beneficial in biomedical applications since solute permeation through CS-based composite membranes could be controlled by adjusting environmental conditions. When aspirin transport (ASA) through the prepared membranes was carried out in different release media, SGF (simulating gastric fluid) and SIF (simulating intestinal fluid without enzymes), it was observed that the Fickian diffusion coefficient (D) was conditioned by the pH of the release solution. In SGIT (simulating gastrointestinal transit) medium, a transition time (ttrans) was detected due to the shrinkage of the CS polymeric chains, and the drug release depended not only on the Fickian's diffusion but also on the shrinkage of the biopolymer, obeying Peppas and Sahlin equation.
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Affiliation(s)
- Alia Baroudi
- Department of Structure of Matter, Thermal Physics and Electronics, Faculty of Physics, University Complutense of Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
- Department of Industrial Engineering, Higher Polytechnic School, University Antonio Nebrija, C/Santa cruz del Marcenado 27, 28015 Madrid, Spain
| | - Carmen García-Payo
- Department of Structure of Matter, Thermal Physics and Electronics, Faculty of Physics, University Complutense of Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Mohamed Khayet
- Department of Structure of Matter, Thermal Physics and Electronics, Faculty of Physics, University Complutense of Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
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2
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Demeter M, Călina I, Scărișoreanu A, Micutz M, Kaya MA. Correlations on the Structure and Properties of Collagen Hydrogels Produced by E-Beam Crosslinking. MATERIALS (BASEL, SWITZERLAND) 2022; 15:ma15217663. [PMID: 36363255 PMCID: PMC9658620 DOI: 10.3390/ma15217663] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 10/03/2022] [Accepted: 10/29/2022] [Indexed: 05/12/2023]
Abstract
In this study, a collagen hydrogel using collagen exclusively produced in Romania, was obtained by electron beam (e-beam) crosslinking. The purpose of our study is to obtain new experimental data on the crosslinking of collagen and to predict as faithfully as possible, its behavior at high irradiation doses and energies. To pursue this, the correlations between macromolecular structure and properties of collagen hydrogels were determined by rheological analysis, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Differential Scanning Calorimetry (DSC), respectively. The gel fraction, swelling degree, and network parameters of the collagen hydrogels were also investigated at different irradiation doses. Through experimental exploration, we concluded that irradiation with e-beam up to 25 kGy induces crosslinking processes in collagen structure without producing advanced degradation processes. E-beam technology is a great method to develop new materials for medical applications without adding other chemical reagents harmful to human health. The future aim is to develop new wound dressings for rapid healing based on collagen, through irradiation technologies.
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Affiliation(s)
- Maria Demeter
- National Institute for Lasers, Plasma and Radiation Physics (INFLPR), Atomiştilor 409, 077125 Măgurele, Romania
| | - Ion Călina
- National Institute for Lasers, Plasma and Radiation Physics (INFLPR), Atomiştilor 409, 077125 Măgurele, Romania
- Correspondence: (I.C.); (A.S.)
| | - Anca Scărișoreanu
- National Institute for Lasers, Plasma and Radiation Physics (INFLPR), Atomiştilor 409, 077125 Măgurele, Romania
- Correspondence: (I.C.); (A.S.)
| | - Marin Micutz
- Department of Physical Chemistry, University of Bucharest, 4-12 Regina Elisabeta Blvd., 030018 Bucharest, Romania
| | - Mădălina Albu Kaya
- Department of Collagen, Division Leather and Footwear Research Institute, National Research and Development Institute for Textiles and Leather (INCDTP), 93 Ion Minulescu Str., 031215 Bucharest, Romania
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Bhatt P, Kumar V, Goel R, Sharma SK, Kaushik S, Sharma S, Shrivastava A, Tesema M. Structural Modifications and Strategies for Native Starch for Applications in Advanced Drug Delivery. BIOMED RESEARCH INTERNATIONAL 2022; 2022:2188940. [PMID: 35993055 PMCID: PMC9385375 DOI: 10.1155/2022/2188940] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Revised: 07/12/2022] [Accepted: 07/22/2022] [Indexed: 11/18/2022]
Abstract
Pharmaceutical excipients are compounds or substances other than API which are added to a dosage form, these excipients basically act as carriers, binders, bulk forming agents, colorants, and flavouring agents, and few excipients are even used to enhance the activity of active pharmaceutical ingredient (API) and various more properties. However, despite of these properties, there are problems with the synthetic excipients such as the possibility of causing toxicity, inflammation, autoimmune responses, lack of intrinsic bioactivity and biocompatibility, expensive procedures for synthesis, and water solubility. However, starch as an excipient can overcome all these problems in one go. It is inexpensive, there is no toxicity or immune response, and it is biocompatible in nature. It is very less used as an excipient because of its high digestibility and swelling index, high glycemic index, paste clarity, film-forming property, crystalline properties, etc. All these properties of starch can be altered by a few modification processes such as physical modification, genetic modification, and chemical modification, which can be used to reduce its digestibility and glycemic index of starch, improve its film-forming properties, and increase its paste clarity. Changes in some of the molecular bonds which improve its properties such as binding, crystalline structure, and retrogradation make starch perfect to be used as a pharmaceutical excipient. This research work provides the structural modifications of native starch which can be applicable in advanced drug delivery. The major contributions of the paper are advances in the modification of native starch molecules such as physically, chemically, enzymatically, and genetically traditional crop modification to yield a novel molecule with significant potential for use in the pharmaceutical industry for targeted drug delivery systems.
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Affiliation(s)
- Pankaj Bhatt
- KIET Group of Institutions (KIET School of Pharmacy), Delhi NCR, Muradnagar, Ghaziabad, India
- Department of Pharmaceutical Science, Gurukul Kangri (Deemed to Be University), Haridwar, Uttarakhand, India
| | - Vipin Kumar
- Department of Pharmaceutical Science, Gurukul Kangri (Deemed to Be University), Haridwar, Uttarakhand, India
| | - Richa Goel
- KIET Group of Institutions (KIET School of Pharmacy), Delhi NCR, Muradnagar, Ghaziabad, India
| | - Somesh Kumar Sharma
- Department of Pharmaceutics, KIET Group of Institutions (KIET School of Pharmacy), Delhi NCR, Muradnagar, Ghaziabad, India
| | - Shikha Kaushik
- KIET Group of Institutions (KIET School of Pharmacy), Delhi NCR, Muradnagar, Ghaziabad, India
| | - Shivani Sharma
- School of Pharmacy and Research, Dev Bhoomi Uttarakhand University, Dehradun, Uttarakhand, India
| | - Alankar Shrivastava
- KIET Group of Institutions (KIET School of Pharmacy), Delhi NCR, Muradnagar, Ghaziabad, India
| | - Mulugeta Tesema
- Department of Chemistry (Analytical), College of Natural and Computational Sciences, Dambi Dollo University, Dambi Dollo, Oromia Region, Ethiopia
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Sainaga Jyothi VGS, Bulusu R, Venkata Krishna Rao B, Pranothi M, Banda S, Kumar Bolla P, Kommineni N. Stability characterization for pharmaceutical liposome product development with focus on regulatory considerations: An update. Int J Pharm 2022; 624:122022. [PMID: 35843364 DOI: 10.1016/j.ijpharm.2022.122022] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 07/04/2022] [Accepted: 07/11/2022] [Indexed: 12/25/2022]
Abstract
Liposomes have several advantages, such as the ability to be employed as a carrier/vehicle for a variety of drug molecules and at the same time they are safe and biodegradable. In the recent times, compared to other delivery systems, liposomes have been one of the most well-established and commercializing drug products of new drug delivery methods for majority of therapeutic applications. On the other hand, it has several limitations, particularly in terms of stability, which impedes product development and performance. In this review, we reviewed all the potential instabilities (physical, chemical, and biological) that a formulation development scientist confronts throughout the development of liposomal formulations as along with the ways to overcome these challenges. We have also discussed the effect of microbiological contamination on liposomal formulations with a focus on the use of sterilization methods used to improve the stability. Finally, we have reviewed quality control techniques and regulatory considerations recommended by the agencies (USFDA and MHLW) for liposome drug product development.
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Affiliation(s)
- Vaskuri G S Sainaga Jyothi
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana 500037, India
| | - Raviteja Bulusu
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, USA
| | - Balaga Venkata Krishna Rao
- Department of Pharmaceutical Sciences & Technology, Birla Institute of Technology, Mesra, Ranchi 835215, Jharkhand, India
| | - Mulinti Pranothi
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo 58105, ND, USA
| | - Srikanth Banda
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA
| | - Pradeep Kumar Bolla
- Department of Biomedical Engineering, College of Engineering, The University of Texas at El Paso, 500 W. University Ave, El Paso, TX 79968, USA.
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6
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Jacobs GP. Irradiation of pharmaceuticals: A literature review. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2021.109795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Delma KL, Lechanteur A, Evrard B, Semdé R, Piel G. Sterilization methods of liposomes: Drawbacks of conventional methods and perspectives. Int J Pharm 2021; 597:120271. [PMID: 33548365 DOI: 10.1016/j.ijpharm.2021.120271] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 12/18/2020] [Accepted: 12/29/2020] [Indexed: 01/15/2023]
Abstract
Liposomes are targeted drug delivery systems that are of great pharmaceutical and therapeutic interest. Parenteral route is the main way used for liposome administration. In this case, their sterility is a requirement. However, due to the particular sensitivity of liposomes and their tendency to physicochemical alterations, their sterilization remains a real challenge. Conventional sterilization methods such as heat, ethylene oxide, ultraviolet and gamma irradiations are considered as unsuitable for liposome sterilization and the recommended methods for obtaining sterility of liposomes are filtration and aseptic manufacturing. Unfortunately, these recommended methods are not without limitations. This review outlines the difficulties associated with the use of these different classical methods for obtaining liposome sterility. The effects on liposome physicochemical and biopharmaceutical characteristics as well as efficacy, toxicity and practical problems of these sterilization techniques have been discussed. The search for an alternative method being therefore necessary, the applicability of supercritical carbon dioxide (ScCO2) technology, which is nowadays a promising strategy for the sterilization of sensitive products such as liposomes, is also examined. It appears from this analysis that ScCO2 could effectively be an interesting alternative to achieve sterility of liposomes, but for this, sterilization assays including challenge tests and optimization studies are needed.
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Affiliation(s)
- Kouka Luc Delma
- Laboratory of Pharmaceutical Technology and Biopharmacy, Nanomedicine Developments, Center for Interdisciplinary Research on Medicines (CIRM), University of Liège, 4000 Liège, Belgium; Laboratory of Drug Development, Doctoral School of Sciences and Health, University Joseph KI-ZERBO, 03 BP 7021 Ouagadougou 03, Burkina Faso
| | - Anna Lechanteur
- Laboratory of Pharmaceutical Technology and Biopharmacy, Nanomedicine Developments, Center for Interdisciplinary Research on Medicines (CIRM), University of Liège, 4000 Liège, Belgium
| | - Brigitte Evrard
- Laboratory of Pharmaceutical Technology and Biopharmacy, Nanomedicine Developments, Center for Interdisciplinary Research on Medicines (CIRM), University of Liège, 4000 Liège, Belgium
| | - Rasmané Semdé
- Laboratory of Drug Development, Doctoral School of Sciences and Health, University Joseph KI-ZERBO, 03 BP 7021 Ouagadougou 03, Burkina Faso
| | - Géraldine Piel
- Laboratory of Pharmaceutical Technology and Biopharmacy, Nanomedicine Developments, Center for Interdisciplinary Research on Medicines (CIRM), University of Liège, 4000 Liège, Belgium.
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Bai Y, Moeinzadeh S, Kim S, Park Y, Lui E, Tan H, Zhao W, Zhou X, Yang YP. Development of PLGA-PEG-COOH and gelatin-based microparticles dual delivery system and E-beam sterilization effects for controlled release of BMP-2 and IGF-1. PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION : MEASUREMENT AND DESCRIPTION OF PARTICLE PROPERTIES AND BEHAVIOR IN POWDERS AND OTHER DISPERSE SYSTEMS 2020; 37:2000180. [PMID: 33384477 PMCID: PMC7771709 DOI: 10.1002/ppsc.202000180] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The purpose of this study was to develop a PLGA-PEG-COOH- and gelatin-based microparticles (MPs) dual delivery system for release of BMP-2 and IGF-1. We made and characterized the delivery system based on its morphology, loading capacity, Encapsulation efficiency and release kinetics. Second, we examined the effects of electron beam (EB) sterilization on BMP-2 and IGF-1 loaded MPs and their biological effects. Third, we evaluated the synergistic effect of a controlled dual release of BMP-2 and IGF-1 on osteogenesis of MSCs. Encapsulation efficiency of growth factors into gelatin and PLGA-PEG-COOH MPs are in the range of 64.78% to 76.11%. E-beam sterilized growth factor delivery systems were effective in significantly promoting osteogenesis of MSCs, although E-beam sterilization decreased the bioactivity of growth factors in MPs by approximately 22%. BMP-2 release behavior from gelatin MPs/PEG hydrogel shows a faster release (52.7%) than that of IGF-1 from the PLGA-PEG-COOH MPs/PEG hydrogel (27.3%). The results demonstrate that the gelatin and PLGA-PEG-COOH MPs based delivery system could realize temporal release of therapeutic biomolecules by incorporating different growth factors into distinct microparticles. EB sterilization was an accessible method for sterilizing growth factors loaded carriers, which could pave the way for implementing growth factor delivery in clinical applications.
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Affiliation(s)
- Yan Bai
- Department of Orthopaedic Surgery, Stanford University, CA, USA
- School of Pharmacy, Chongqing Medical University, Chongqing, China
| | | | - Sungwoo Kim
- Department of Orthopaedic Surgery, Stanford University, CA, USA
| | - Youngbum Park
- Department of Orthopaedic Surgery, Stanford University, CA, USA
- Dept. Prosthodontics, Yonsei University College of Dentistry, Seoul 120-752, Korea
| | - Elaine Lui
- Department of Orthopaedic Surgery, Stanford University, CA, USA
- Department of Mechanical Engineering, Stanford University, CA, USA
| | - Hua Tan
- School of Biomedical Informatics, the University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Weiling Zhao
- School of Biomedical Informatics, the University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Xiaobo Zhou
- School of Biomedical Informatics, the University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Yunzhi Peter Yang
- Department of Orthopaedic Surgery, Stanford University, CA, USA
- Department of Materials Science and Engineering, Stanford University, CA, USA
- Department of Bioengineering, Stanford University, CA, USA
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9
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El-Nabarawi MA, Abd El Rehem RT, Teaima M, Abary M, El-Mofty HM, Khafagy MM, Lotfy NM, Salah M. Natamycin niosomes as a promising ocular nanosized delivery system with ketorolac tromethamine for dual effects for treatment of candida rabbit keratitis; in vitro/in vivo and histopathological studies. Drug Dev Ind Pharm 2019; 45:922-936. [DOI: 10.1080/03639045.2019.1579827] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Mohamed Ahmed El-Nabarawi
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Randa Tag Abd El Rehem
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Mahmoud Teaima
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Mohammed Abary
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | | | - Mohamed M. Khafagy
- Department of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Nancy M. Lotfy
- Department of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Mona Salah
- Department of surgical pathology, Faculty of Medicine, Cairo University, Cairo, Egypt
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10
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Baroudi A, García-Payo C, Khayet M. Structural, Mechanical, and Transport Properties of Electron Beam-Irradiated Chitosan Membranes at Different Doses. Polymers (Basel) 2018; 10:E117. [PMID: 30966153 PMCID: PMC6415169 DOI: 10.3390/polym10020117] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 01/23/2018] [Accepted: 01/24/2018] [Indexed: 11/28/2022] Open
Abstract
Chitosan powder irradiated by electron beam at different doses, up to 250 kGy, was used to prepare membranes for drug release applications. The irradiation effect on the molecular weight of powder chitosan, the characteristics of the prepared membranes, and their transport of sulfamerazine sodium salt (SULF) were investigated. The effect of the addition of glutaraldehyde (GLA) as a crosslinking agent in the chitosan solution used for the preparation of the membranes was also studied. A decrease in the chitosan molecular weight with the increase in the irradiation dose was observed, while the membranes prepared with the irradiated chitosan at higher dose exhibited lower swelling. However, an opposite behavior was detected when the membranes were prepared with GLA-crosslinked chitosan. A GLA crosslinking agent reduced the crystallinity of the chitosan membranes and the swelling, whereas the water contact angle and SULF transport increased with the increase in the irradiation dose.
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Affiliation(s)
- Alia Baroudi
- Department of Applied Physics I, Faculty of Physics, University Complutense of Madrid, Avda. Complutense, s/n, 28040 Madrid, Spain.
| | - Carmen García-Payo
- Department of Applied Physics I, Faculty of Physics, University Complutense of Madrid, Avda. Complutense, s/n, 28040 Madrid, Spain.
| | - Mohamed Khayet
- Department of Applied Physics I, Faculty of Physics, University Complutense of Madrid, Avda. Complutense, s/n, 28040 Madrid, Spain.
- Madrid Institute for Advanced Studies of Water (IMDEA Water Institute), Avda. Punto Com n° 2, Alcalá de Henares, 28805 Madrid, Spain.
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Galante R, Pinto TJA, Colaço R, Serro AP. Sterilization of hydrogels for biomedical applications: A review. J Biomed Mater Res B Appl Biomater 2017; 106:2472-2492. [PMID: 29247599 DOI: 10.1002/jbm.b.34048] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 11/04/2017] [Accepted: 11/12/2017] [Indexed: 12/19/2022]
Abstract
Despite the beneficial properties and outstanding potential of hydrogels for biomedical applications, several unmet challenges must be overcome, especially regarding to their known sensitivity to conventional sterilization methods. It is crucial for any biomaterial to withstand an efficient sterilization to obtain approval from regulatory organizations and to safely proceed to clinical trials. Sterility assurance minimizes the incidence of medical device-related infections, which still constitute a major concern in health care. In this review, we provide a detailed and comprehensive description of the published work from the past decade regarding the effects of sterilization on different types of hydrogels for biomedical applications. Advances in hydrogel production methods with simultaneous sterilization are also reported. Terminal sterilization methods can induce negative or positive effects on several material properties (e.g., aspect, size, color, chemical structure, mechanical integrity, and biocompatibility). Due to the complexity of factors involved (e.g., material properties, drug stability, sterilization conditions, and parameters), it is important to note the virtual impossibility of predicting the outcome of sterilization methods to determine a set of universal rules. Each system requires case-by-case testing to select the most suitable, effective method that allows for the main properties to remain unaltered. The impact of sterilization methods on the intrinsic properties of these systems is understudied, and further research is needed. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2472-2492, 2018.
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Affiliation(s)
- Raquel Galante
- Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Butantã, São Paulo, Brazil.,Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Terezinha J A Pinto
- Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Butantã, São Paulo, Brazil
| | - Rogério Colaço
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal.,Departamento de Engenharia Mecânica and IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Ana Paula Serro
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal.,Centro de Investigação Interdisciplinar Egas Moniz, Instituto Superior de Ciências da Saúde Egas Moniz, Quinta da Granja, Monte de Caparica, Caparica, Portugal
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de Oliveira AR, Mesquita PC, Machado PRL, Farias KJS, de Almeida YMB, Fernandes-Pedrosa MF, Cornélio AM, do Egito EST, da Silva-Júnior AA. Monitoring structural features, biocompatibility and biological efficacy of gamma-irradiated methotrexate-loaded spray-dried microparticles. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 80:438-448. [PMID: 28866185 DOI: 10.1016/j.msec.2017.06.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 05/26/2017] [Accepted: 06/16/2017] [Indexed: 12/14/2022]
Abstract
In this study, biodegradable and biocompatible gamma irradiated poly-(dl-lactide-co-glycolide) (PLGA) spray-dried microparticles were prepared aiming to improve the efficacy of methotrexate (MTX). The experimental design included three formulations of microparticles containing distinct drug amount (9%, 18%, and 27% w/w) and three distinct gamma irradiation dose (15kGy, 25kGy, and 30kGy). The physicochemical and drug release properties of the microparticles supported their biocompatibility and biological efficacy studies in different cell lines. The irradiation induced slight changes in the spherical shape of the microparticles and the formation of free radicals was dependent on the drug loading. However, the amorphous character, particle size, drug loading, and drug release rate of the microparticles were preserved. The drug release data from all microparticles formulation were evaluated by using four drug kinetic models and by comparison of their similarity factor (f2). The gamma irradiation did not induce changes in the biocompatibility of PLGA microparticles and in the biological activity of the MTX-loaded microparticles. Finally, the spray-dried MTX-loaded PLGA microparticles enhanced the efficacy of the drug in the human cervical cancer cells (SiHa cell line). This study demonstrated the feasibility of the gamma irradiated spray dried PLGA microparticles for prolonged release of MTX, supporting a promising antitumor-drug delivery system for parenteral (subcutaneous) or pulmonary use.
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Affiliation(s)
- Alice R de Oliveira
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte, UFRN, 59012-570 Natal, RN, Brazil
| | - Philippe C Mesquita
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte, UFRN, 59012-570 Natal, RN, Brazil
| | - Paula R L Machado
- Department of Clinical Analysis and Toxicology, Federal University of Rio Grande do Norte, UFRN, 59012-570 Natal, RN, Brazil
| | - Kleber J S Farias
- Department of Clinical Analysis and Toxicology, Federal University of Rio Grande do Norte, UFRN, 59012-570 Natal, RN, Brazil
| | - Yêda M B de Almeida
- Department of Chemical Engineering, Federal University of Pernambuco, UFPE, 50740-521 Recife, PE, Brazil
| | - Matheus F Fernandes-Pedrosa
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte, UFRN, 59012-570 Natal, RN, Brazil
| | - Alianda M Cornélio
- Department of Morphology, Federal University of Rio Grande do Norte, UFRN, 59078-970 Natal, RN, Brazil
| | - Eryvaldo Sócrates T do Egito
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte, UFRN, 59012-570 Natal, RN, Brazil
| | - Arnóbio A da Silva-Júnior
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte, UFRN, 59012-570 Natal, RN, Brazil.
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Masina N, Choonara YE, Kumar P, du Toit LC, Govender M, Indermun S, Pillay V. A review of the chemical modification techniques of starch. Carbohydr Polym 2017; 157:1226-1236. [DOI: 10.1016/j.carbpol.2016.09.094] [Citation(s) in RCA: 193] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 09/21/2016] [Accepted: 09/22/2016] [Indexed: 10/20/2022]
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14
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Zhao Y, Han L, Yan J, Li Z, Wang F, Xia Y, Hou S, Zhong H, Zhang F, Gu N. Irradiation Sterilized Gelatin-Water-Glycerol Ternary Gel as an Injectable Carrier for Bone Tissue Engineering. Adv Healthc Mater 2017; 6. [PMID: 27863162 DOI: 10.1002/adhm.201600749] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/29/2016] [Indexed: 12/18/2022]
Abstract
Injectable gelatin gels offer an attractive option for filling bone defects. The challenge is to fabricate gelatin gels with optimal gelation properties, which can be irradiation sterilized. Here, a gelatin-water-glycerol (GWG) gel is reported for use as a broad-spectrum injectable carrier. This ternary gel is high in glycerol and low in water, and remains stable after gamma irradiation at doses (25 kGy). As an injectable gel, it remains a viscous solution at gelatin concentrations ≤2.0%, at room temperature. Its storage modulus increases dramatically and eventually exceeds the loss modulus around 46-50 °C, indicating a transition from a liquid-like state to an elastic gel-like state. This ternary gel ranges significantly in terms of storage modulus (12-1700 Pa) while demonstrating a narrow pH range (5.58-5.66), depending on the gelatin concentration. Therefore, it can be loaded with a variety of materials. It is highly cytocompatible compared with saline in vivo and culture media in vitro. When loaded with demineralized bone matrix, the composites show favorable injectability, and excellent osteogenesis performance, after irradiation. These features can be attributed to high hydrophilicity and fast degradability. These findings justify that this ternary gel is promising as an irradiation-sterilized and universal injectable delivery system.
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Affiliation(s)
- Yantao Zhao
- Beijing Engineering Research Center of Orthopaedic Implants; First Affiliated Hospital of CPLA General Hospital; Beijing 100048 P. R. China
| | - Liwei Han
- Beijing Engineering Research Center of Orthopaedic Implants; First Affiliated Hospital of CPLA General Hospital; Beijing 100048 P. R. China
| | - Jun Yan
- School of Stomatology; Fourth Military Medical University; Xi'an 710032 P. R. China
| | - Zhonghai Li
- Beijing Engineering Research Center of Orthopaedic Implants; First Affiliated Hospital of CPLA General Hospital; Beijing 100048 P. R. China
| | - Fuli Wang
- Beijing Engineering Research Center of Orthopaedic Implants; First Affiliated Hospital of CPLA General Hospital; Beijing 100048 P. R. China
| | - Yang Xia
- Jiangsu Key Laboratory of Oral Diseases; Nanjing Medical University; Nanjing 210029 P. R. China
- Suzhou Institute & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Suzhou 215000 P. R. China
| | - Shuxun Hou
- Beijing Engineering Research Center of Orthopaedic Implants; First Affiliated Hospital of CPLA General Hospital; Beijing 100048 P. R. China
| | - Hongbin Zhong
- Beijing Engineering Research Center of Orthopaedic Implants; First Affiliated Hospital of CPLA General Hospital; Beijing 100048 P. R. China
| | - Feimin Zhang
- Jiangsu Key Laboratory of Oral Diseases; Nanjing Medical University; Nanjing 210029 P. R. China
- Suzhou Institute & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Suzhou 215000 P. R. China
| | - Ning Gu
- Suzhou Institute & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Suzhou 215000 P. R. China
- State Key Laboratory of Bioelectronics; Jiangsu Key Laboratory of Biomaterials and Devices; School of Biological Science and Medical Engineering; Southeast University; Nanjing 210009 P. R. China
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15
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Asasutjarit R, Theerachayanan T, Kewsuwan P, Veeranondha S, Fuongfuchat A, Ritthidej GC. Gamma sterilization of diclofenac sodium loaded- N-trimethyl chitosan nanoparticles for ophthalmic use. Carbohydr Polym 2016; 157:603-612. [PMID: 27987968 DOI: 10.1016/j.carbpol.2016.10.029] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 09/24/2016] [Accepted: 10/10/2016] [Indexed: 02/06/2023]
Abstract
This study was conducted to investigate the effect of gamma irradiation on physicochemical properties of N-trimethyl chitosan (TMC), diclofenac sodium (DC) and diclofenac sodium loaded N-trimethylchitosan nanoparticles (DC-TMCNs), and to determine suitable doses of gamma rays for sterilization of DC-TMCNs. Physicochemical properties of TMC, DC and DC-TMCNs before and after exposure to gamma rays at various doses were investigated. It was found that gamma irradiation at doses of 5-25kGy did not cause any significant changes in physical and chemical properties of TMC, DC and DC-TMCNs. The bioburden of DC-TMCNs was 1.5×106 CFU/vial. The initial contaminating bacteria were radiosensitive bacteria. A number of microorganisms was reduced to 10-6 after exposure to 9.9kGy of gamma rays. Therefore, DC-TMCNs could be sterilized by gamma irradiation at a dose of 10kGy, which did not alter their physicochemical properties and did not produce any substances toxic to the eye.
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Affiliation(s)
- Rathapon Asasutjarit
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, Thammasat University, Pathum Thani 12120, Thailand.
| | - Thitaree Theerachayanan
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Rangsit University, Pathum Thani 12000, Thailand
| | - Prartana Kewsuwan
- Group of Research and Development, Thailand Institute of Nuclear Technology (Public Organization), Nakhon Nayok 26120, Thailand
| | - Sukitaya Veeranondha
- National Center For Genetic Engineering and Biotechnology, National Science and Technology Development Agency (NSTDA), Thailand Science Park, Pathum Thani 12120, Thailand
| | - Asira Fuongfuchat
- National Metal and Materials Technology Center, National Science and Technology Development Agency (NSTDA), Thailand Science Park, Pathum Thani 12120, Thailand
| | - Garnpimol C Ritthidej
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
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16
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Mazor E, Zilberman M. Effect of gamma-irradiation sterilization on the physical and mechanical properties of a hybrid wound dressing. POLYM ADVAN TECHNOL 2016. [DOI: 10.1002/pat.3854] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Eytan Mazor
- Department of Materials Science and Engineering; Tel-Aviv University; Tel-Aviv 69978 Israel
| | - Meital Zilberman
- Department of Materials Science and Engineering; Tel-Aviv University; Tel-Aviv 69978 Israel
- Department of Biomedical Engineering; Tel-Aviv University; Tel-Aviv 69978 Israel
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17
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Levofloxacin hemihydrate ocular semi-sponges for topical treatment of bacterial conjunctivitis: Formulation and in-vitro/in-vivo characterization. J Drug Deliv Sci Technol 2016. [DOI: 10.1016/j.jddst.2015.11.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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18
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Saher O, Ghorab DM, Mursi NM. Preparation and in vitro/in vivo evaluation of antimicrobial ocular in situ gels containing a disappearing preservative for topical treatment of bacterial conjunctivitis. Pharm Dev Technol 2015; 21:600-10. [DOI: 10.3109/10837450.2015.1035728] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Osama Saher
- Department Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Dalia M. Ghorab
- Department Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Nadia M. Mursi
- Department Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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19
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Mechanical properties of tough hydrogels synthesized with a facile simultaneous radiation polymerization and cross-linking method. Radiat Phys Chem Oxf Engl 1993 2015. [DOI: 10.1016/j.radphyschem.2014.06.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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20
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Abuhanoğlu G, Ozer AY. Radiation sterilization of new drug delivery systems. Interv Med Appl Sci 2014; 6:51-60. [PMID: 24936306 PMCID: PMC4047505 DOI: 10.1556/imas.6.2014.2.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 01/17/2014] [Accepted: 02/14/2014] [Indexed: 11/19/2022] Open
Abstract
Radiation sterilization has now become a commonly used method for sterilization of several active ingredients in drugs or drug delivery systems containing these substances. In this context, many applications have been performed on the human products that are required to be sterile, as well as on pharmaceutical products prepared to be developed. The new drug delivery systems designed to deliver the medication to the target tissue or organ, such as microspheres, nanospheres, microemulsion, and liposomal systems, have been sterilized by gamma (γ) and beta (β) rays, and more recently, by e-beam sterilization. In this review, the sterilization of new drug delivery systems was discussed other than conventional drug delivery systems by γ irradiation.
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Affiliation(s)
- Gürhan Abuhanoğlu
- Department of Radiopharmacy, Faculty of Pharmacy, Hacettepe University Sıhhiye, Ankara Turkey
| | - A Yekta Ozer
- Department of Radiopharmacy, Faculty of Pharmacy, Hacettepe University Sıhhiye, Ankara Turkey
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21
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Halpern JM, Gormley CA, Keech M, von Recum HA. Thermomechanical Properties, Antibiotic Release, and Bioactivity of a Sterilized Cyclodextrin Drug Delivery System. J Mater Chem B 2014; 2:2764-2772. [PMID: 24949201 PMCID: PMC4058863 DOI: 10.1039/c4tb00083h] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various local drug delivery devices and coatings are being developed as slow, sustained release mechanism for drugs, yet the polymers are typically not evaluated after commercial sterilization techniques. We examine the effect that commercial sterilization techniques have on the physical, mechanical, and drug delivery properties of polyurethane polymers. Specifically we tested cyclodextrin-hexamethyl diisocyanate crosslinked polymers before and after autoclave, ethylene oxide, and gamma radiation sterilization processes. We found that there is no significant change in the properties of polymers sterilized by ethylene oxide and gamma radiation compared to non-sterilized polymers. Polymers sterilized by autoclave showed increased tensile strength (p<0.0001) compared to non-sterilized polymers . In the release of drugs, which were loaded after the autoclave sterilization process, we observed a prolonged release (p<0.05) and a prolonged therapeutic effect (p<0.05) but less drug loading (p<0.0001) compared to non-sterilized polymers. The change in the release profile and tensile strength in polymers sterilized by autoclave was interpreted as being caused by additional crosslinking from residual, unreacted, or partially-reacted crosslinker contained within the polymer. Autoclaving therefore represents additional thermo-processing to modify rate and dose from polyurethanes and other materials.
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Affiliation(s)
- Jeffrey M. Halpern
- Case Western Reserve University, Department of Biomedical Engineering, 10900 Euclid Ave, Cleveland, OH 44118 USA Fax: +1 (216) 368-5513; Tel: +1 (216) 368-4969
| | - Catherine A. Gormley
- Case Western Reserve University, Department of Biomedical Engineering, 10900 Euclid Ave, Cleveland, OH 44118 USA Fax: +1 (216) 368-5513; Tel: +1 (216) 368-4969
| | - Melissa Keech
- Case Western Reserve University, Department of Biomedical Engineering, 10900 Euclid Ave, Cleveland, OH 44118 USA Fax: +1 (216) 368-5513; Tel: +1 (216) 368-4969
| | - Horst A. von Recum
- Case Western Reserve University, Department of Biomedical Engineering, 10900 Euclid Ave, Cleveland, OH 44118 USA Fax: +1 (216) 368-5513; Tel: +1 (216) 368-4969
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22
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A comparative study of the effect of Ni9+ and Au8+ ion beams on the properties of poly(methacrylic acid) grafted gum ghatti films. Radiat Phys Chem Oxf Engl 1993 2014. [DOI: 10.1016/j.radphyschem.2013.12.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Guillot R, Gilde F, Becquart P, Sailhan F, Lapeyrere A, Logeart-Avramoglou D, Picart C. The stability of BMP loaded polyelectrolyte multilayer coatings on titanium. Biomaterials 2013; 34:5737-46. [PMID: 23642539 DOI: 10.1016/j.biomaterials.2013.03.067] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Accepted: 03/24/2013] [Indexed: 02/07/2023]
Abstract
Immobilization of bone morphogenetic proteins (BMP) onto material surfaces is a promising, but still challenging, strategy for achieving dependable and consistent osseointegration of long-term metal implants. In the present study, we have developed an osteoinductive coating of a porous titanium implant using biomimetic polyelectrolyte multilayer (PEM) films loaded with BMP-2. The amount of BMP-2 loaded in these films was tuned - over a large range - depending on the cross-linking extent of the film and of the BMP-2 initial concentration. The air-dried PEM films were stable for at least one year of storage at 4 °C. In addition, they resisted exposure to γ-irradiation at clinically approved doses. The preservation of the growth factor bioactivity upon long-term storage and sterilization were evaluated both in vitro (using C2C12 cells) and in vivo (in a rat ectopic model) for the perspective of industrial and clinical development. BMP-2 loaded in dried PEM films exhibited shelf-life stability over one year. However, their bioactivity in vitro decreased from 50 to 80% after irradiation depending on the γ-irradiation dose. Remarkably, the in vivo studies showed that the osteoinductive potential of BMP-2 contained in PEM-coated Ti implants was fully preserved after air-drying of the implants and sterilization at 25 kGy. Film drying or irradiation did not affect the amount of new bone tissue formation. This "off-the-shelf" novel technology of functionalized implants opens promising applications in prosthetic and tissue engineering fields.
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Affiliation(s)
- Raphael Guillot
- UMR 5628 (LMGP), Grenoble Institute of Technology and CNRS, 3 Parvis Louis Néel, F-38016 Grenoble Cedex, France
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24
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Current application of controlled degradation processes in polymer modification and functionalization. J Appl Polym Sci 2013. [DOI: 10.1002/app.39006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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25
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Tayel SA, El-Nabarawi MA, Tadros MI, Abd-Elsalam WH. Promising ion-sensitive in situ ocular nanoemulsion gels of terbinafine hydrochloride: Design, in vitro characterization and in vivo estimation of the ocular irritation and drug pharmacokinetics in the aqueous humor of rabbits. Int J Pharm 2013; 443:293-305. [PMID: 23333217 DOI: 10.1016/j.ijpharm.2012.12.049] [Citation(s) in RCA: 124] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Revised: 12/24/2012] [Accepted: 12/29/2012] [Indexed: 01/11/2023]
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26
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Behnoodfar D, Dadbin S, Frounchi M. PLA Microspheres-Embedded PVA Hydrogels Prepared by Gamma-Irradiation and Freeze-Thaw Methods as Drug Release Carriers. INT J POLYM MATER PO 2013. [DOI: 10.1080/00914037.2011.641648] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Cao Y, Wang B, Lou D, Wang Y, Hao S, Zhang L. Nanoscale delivery systems for multiple drug combinations in cancer. Future Oncol 2011; 7:1347-57. [DOI: 10.2217/fon.11.109] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Although drug-delivery systems have been developed to improve drug biodistribution and efficiency in cancer therapy, some limitations still hinder successful drug targeting and delivery. Multiple drugs in combination seems a promising strategy for cancer therapy. It enables drugs to be delivered to multiple targets and exhibits the additive or synergistic effects of drugs. Physiological barriers are known to be the main obstacles of insufficient drug efficacy and delivery in tumors, but they are likely to be potential targets in combination therapy as well. This article discusses some general considerations for optimizing multiply drug delivery, including drug-release profiles and loading strategies.
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Affiliation(s)
- Yang Cao
- College of Bioengineering, Chongqing University, Shazheng Street No.174. Shapingba, Chongqing 400030, People’s Republic of China
| | - Bochu Wang
- College of Bioengineering, Chongqing University, Shazheng Street No.174. Shapingba, Chongqing 400030, People’s Republic of China
| | - Deshuai Lou
- College of Bioengineering, Chongqing University, Shazheng Street No.174. Shapingba, Chongqing 400030, People’s Republic of China
| | - Yazhou Wang
- College of Bioengineering, Chongqing University, Shazheng Street No.174. Shapingba, Chongqing 400030, People’s Republic of China
| | - Shilei Hao
- College of Bioengineering, Chongqing University, Shazheng Street No.174. Shapingba, Chongqing 400030, People’s Republic of China
| | - Lin Zhang
- College of Bioengineering, Chongqing University, Shazheng Street No.174. Shapingba, Chongqing 400030, People’s Republic of China
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28
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Rosario-Meléndez R, Lavelle L, Bodnar S, Halperin F, Harper I, Griffin J, Uhrich KE. Stability of a salicylate-based poly(anhydride-ester) to electron beam and gamma radiation. Polym Degrad Stab 2011; 96:1625-1630. [PMID: 21909173 DOI: 10.1016/j.polymdegradstab.2011.06.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The effect of electron beam and gamma radiation on the physicochemical properties of a salicylate-based poly(anhydride-ester) was studied by exposing polymers to 0 (control), 25 and 50 kGy. After radiation exposure, salicylic acid release in vitro was monitored to assess any changes in drug release profiles. Molecular weight, glass transition temperature and decomposition temperature were evaluated for polymer chain scission and/or crosslinking as well as changes in thermal properties. Proton nuclear magnetic resonance and infrared spectroscopies were also used to determine polymer degradation and/or chain scission. In vitro cell studies were performed to identify cytocompatibility following radiation exposure. These studies demonstrate that the physicochemical properties of the polymer are not substantially affected by exposure to electron beam and gamma radiation.
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Affiliation(s)
- Roselin Rosario-Meléndez
- Rutgers, The State University of New Jersey, Department of Chemistry and Chemical Biology, 610 Taylor Road, Piscataway, New Jersey 08854, United States
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29
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Barreto JA, O'Malley W, Kubeil M, Graham B, Stephan H, Spiccia L. Nanomaterials: applications in cancer imaging and therapy. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:H18-40. [PMID: 21433100 DOI: 10.1002/adma.201100140] [Citation(s) in RCA: 616] [Impact Index Per Article: 47.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Indexed: 05/11/2023]
Abstract
The application of nanomaterials (NMs) in biomedicine is increasing rapidly and offers excellent prospects for the development of new non-invasive strategies for the diagnosis and treatment of cancer. In this review, we provide a brief description of cancer pathology and the characteristics that are important for tumor-targeted NM design, followed by an overview of the different types of NMs explored to date, covering synthetic aspects and approaches explored for their application in unimodal and multimodal imaging, diagnosis and therapy. Significant synthetic advances now allow for the preparation of NMs with highly controlled geometry, surface charge, physicochemical properties, and the decoration of their surfaces with polymers and bioactive molecules in order to improve biocompatibility and to achieve active targeting. This is stimulating the development of a diverse range of nanometer-sized objects that can recognize cancer tissue, enabling visualization of tumors, delivery of anti-cancer drugs and/or the destruction of tumors by different therapeutic techniques.
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Affiliation(s)
- José A Barreto
- School of Chemistry, Monash University Clayton, VIC, Australia
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