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Oates WA, Anastasiou AD. A novel microfluidic tool for the evaluation of local drug delivery systems in simulated in vivo conditions. LAB ON A CHIP 2024; 24:3840-3849. [PMID: 39045628 DOI: 10.1039/d4lc00181h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
A 3D-printed microfluidic tool for assessing local drug delivery systems (LDD) in simulated in vivo conditions was developed and evaluated. The device was designed considering the oral environment and dental applications, and it was fabricated with a high-precision resin 3D printer. Chitosan scaffolds loaded with different concentrations of doxycycline were used for evaluating our device. The concentration of the released drug was measured through in-line UV-VIS spectroscopy, and to verify the repeatability and accuracy of our measurements, comparisons with standard HPLC results were made (5% deviation). Cumulative drug release profiles in steady-state conditions were obtained and compared to the Weibull model. The behaviour of the LDD system in a dynamic environment was also evaluated during experiments where step changes in pH were introduced. It was demonstrated that under infection-like conditions, there is an immediate response from the polymer and a clear increase in the concentration of the released drug. Continuous flow and recirculation experiments were also conducted, revealing significant differences in the drug release profiles. Specifically, in the case of continuous flow, the quantity of the released drug is much higher due to the higher driving force for diffusion (concentration gradient). Overall, the proposed microfluidic tool proved to be ideal for evaluating LDD systems, as the in vivo microenvironment can be replicated in a better way than with currently used standard systems.
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Affiliation(s)
- William A Oates
- Lab of Complex Fluids and Microfluidics, Department of Chemical Engineering, University of Manchester, Manchester, M1 9PL, UK.
| | - Antonios D Anastasiou
- Lab of Complex Fluids and Microfluidics, Department of Chemical Engineering, University of Manchester, Manchester, M1 9PL, UK.
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Iqbal N, Ganguly P, Yildizbakan L, Raif EM, Jones E, Giannoudis PV, Jha A. Chitosan Scaffolds from Crustacean and Fungal Sources: A Comparative Study for Bone-Tissue-Engineering Applications. Bioengineering (Basel) 2024; 11:720. [PMID: 39061802 PMCID: PMC11273506 DOI: 10.3390/bioengineering11070720] [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: 05/17/2024] [Revised: 07/05/2024] [Accepted: 07/12/2024] [Indexed: 07/28/2024] Open
Abstract
Chitosan (CS), a biopolymer, holds significant potential in bone regeneration due to its biocompatibility and biodegradability attributes. While crustacean-derived CS is conventionally used in research, there is growing interest in fungal-derived CS for its equally potent properties in bone regenerative applications. Here, we investigated the physicochemical and biological characteristics of fungal (MDC) and crustacean (ADC)-derived CS scaffolds embedded with different concentrations of tricalcium phosphate minerals (TCP), i.e., 0(wt)%: ADC/MDC-1, 10(wt)%: ADC/MDC-2, 20(wt)%: ADC/MDC-3 and 30(wt)%: ADC/MDC-4. ADC-1 and MDC-1 lyophilised scaffolds lacking TCP minerals presented the highest zeta potentials of 47.3 ± 1.2 mV and 55.1 ± 1.6 mV, respectively. Scanning electron microscopy revealed prominent distinctions whereby MDC scaffolds exhibited striation-like structural microarchitecture in contrast to the porous morphology exhibited by ADC scaffold types. With regard to the 4-week scaffold mass reductions, MDC-1, MDC-2, MDC-3, and MDC-4 indicated declines of 55.98 ± 4.2%, 40.16 ± 3.6%, 27.05 ± 4.7%, and 19.16 ± 5.3%, respectively. Conversely, ADC-1, ADC-2, ADC-3, and ADC-4 presented mass reductions of 35.78 ± 5.1%, 25.19 ± 4.2%, 20.23 ± 6.3%, and 13.68 ± 5.4%, respectively. The biological performance of the scaffolds was assessed through in vitro bone marrow mesenchymal stromal cell (BMMSCs) attachment via indirect and direct cytotoxicity studies, where all scaffold types presented no cytotoxic behaviours. MDC scaffolds indicated results comparable to ADC, where both CS types exhibited similar physiochemical properties. Our data suggest that MDC scaffolds could be a potent alternative to ADC-derived scaffolds for bone regeneration applications, particularly for 10(wt)% TCP concentrations.
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Affiliation(s)
- Neelam Iqbal
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
- Faculty of Medicine and Health, School of Dentistry, University of Leeds, Leeds LS2 9JT, UK;
| | - Payal Ganguly
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds LS9 7JT, UK
| | - Lemiha Yildizbakan
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
| | - El Mostafa Raif
- Faculty of Medicine and Health, School of Dentistry, University of Leeds, Leeds LS2 9JT, UK;
| | - Elena Jones
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds LS9 7JT, UK
| | - Peter V. Giannoudis
- Academic Department of Trauma and Orthopaedic Surgery, University of Leeds, Leeds LS2 9JT, UK
| | - Animesh Jha
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
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Yildizbakan L, Iqbal N, Giannoudis PV, Jha A. Synthesis of Chitosan and Ferric-Ion (Fe 3+)-Doped Brushite Mineral Cancellous Bone Scaffolds. Biomimetics (Basel) 2024; 9:308. [PMID: 38921188 PMCID: PMC11202294 DOI: 10.3390/biomimetics9060308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 05/14/2024] [Accepted: 05/17/2024] [Indexed: 06/27/2024] Open
Abstract
Biodegradable scaffolds are needed to repair bone defects. To promote the resorption of scaffolds, a large surface area is required to encourage neo-osteogenesis. Herein, we describe the synthesis and freeze-drying methodologies of ferric-ion (Fe3+) doped Dicalcium Phosphate Dihydrate mineral (DCPD), also known as brushite, which has been known to favour the in situ condition for osteogenesis. In this investigation, the role of chitosan during the synthesis of DCPD was explored to enhance the antimicrobial, scaffold pore distribution, and mechanical properties post freeze-drying. During the synthesis of DCPD, the calcium nitrate solution was hydrolysed with a predetermined stoichiometric concentration of ammonium phosphate. During the hydrolysis reaction, 10 (mol)% iron (Fe3+) nitrate (Fe(NO3)3) was incorporated, and the DCPD minerals were precipitated (Fe3+-DCPD). Chitosan stir-mixed with Fe3+-DCPD minerals was freeze-dried to create scaffolds. The structural, microstructural, and mechanical properties of freeze-dried materials were characterized.
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Affiliation(s)
- Lemiha Yildizbakan
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK;
| | - Neelam Iqbal
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK;
| | - Peter V. Giannoudis
- Academic Department of Trauma and Orthopaedic Surgery, School of Medicine, University of Leeds, Leeds LS2 9JT, UK;
| | - Animesh Jha
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK;
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Wu MY, Huang SW, Kao IF, Yen SK. The Preparation and Characterization of Chitosan/Calcium Phosphate Composite Microspheres for Biomedical Applications. Polymers (Basel) 2024; 16:167. [PMID: 38256966 PMCID: PMC10820865 DOI: 10.3390/polym16020167] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 12/27/2023] [Accepted: 01/03/2024] [Indexed: 01/24/2024] Open
Abstract
In this study, we successfully prepared porous composite microspheres composed of hydroxyapatite (HAp), di-calcium phosphate di-hydrated (DCPD), and chitosan through the hydrothermal method. The chitosan played a crucial role as a chelating agent to facilitate the growth of related calcium phosphates. The synthesized porous composite microspheres exhibit a specific surface area of 38.16 m2/g and a pore volume of 0.24 cm3/g, with the pore size ranging from 4 to 100 nm. Given the unique properties of chitosan and the exceptional porosity of these composite microspheres, they may serve as carriers for pharmaceuticals. After being annealed, the chitosan transforms into a condensed form and the DCPD transforms into Ca2P2O7 at 300 °C. Then, the Ca2P2O7 initially combines with HAp to transform into β tricalcium phosphate (β-TCP) at 500 °C where the chitosan is also completely combusted. Finally, the microspheres are composed of Ca2P2O7, β-TCP, and HAp, also making them suitable for applications such as injectable bone graft materials.
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Affiliation(s)
- Meng-Ying Wu
- Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan; (M.-Y.W.); (S.-W.H.)
- Department of Orthopedics, National Defense Medical Center, Taipei 114, Taiwan
- Department of Orthopedics, Taichung Armed Forces General Hospital, Taichung 404, Taiwan
| | - Shih-Wei Huang
- Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan; (M.-Y.W.); (S.-W.H.)
| | - I-Fang Kao
- Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan; (M.-Y.W.); (S.-W.H.)
| | - Shiow-Kang Yen
- Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan; (M.-Y.W.); (S.-W.H.)
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Pelin IM, Popescu I, Calin M, Rebleanu D, Voicu G, Ionita D, Zaharia MM, Constantin M, Fundueanu G. Tri-Component Hydrogel as Template for Nanocrystalline Hydroxyapatite Deposition Using Alternate Soaking Method for Bone Tissue Engineering Applications. Gels 2023; 9:905. [PMID: 37998995 PMCID: PMC10671408 DOI: 10.3390/gels9110905] [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: 09/27/2023] [Revised: 11/08/2023] [Accepted: 11/15/2023] [Indexed: 11/25/2023] Open
Abstract
Composite hydrogels containing apatite-like particles can act as scaffolds for osteoblast proliferation, with applications in bone tissue engineering. In this respect, porous biocompatible hydrogels were obtained from chitosan, oxidized pullulan, and PVA in different ratios. The stability of the hydrogels was ensured both by covalent bonds between aldehyde groups of oxidized pullulan and free amino groups of chitosan, and by physical bonds formed during freeze-thaw cycles and lyophilization. The deposition of calcium phosphates was performed by alternate soaking of the porous hydrogels into solutions with calcium and phosphate ions, assuring a basic pH required for hydroxyapatite formation. The mineralized hydrogels were characterized using FTIR spectroscopy, scanning electron microscopy, X-ray diffraction, and thermogravimetric analysis, showing that inorganic particles containing between 80 and 92% hydroxyapatite were deposited in a high amount on the pore walls of the polymeric matrix. The composition of the organic matrix influenced the crystallization of calcium phosphates and the mechanical properties of the composite hydrogels. In vitro biological tests showed that mineralized hydrogels support the proliferation of MG-63 osteoblast-like cells to a greater extent compared to pristine hydrogels.
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Affiliation(s)
- Irina Mihaela Pelin
- “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania; (I.M.P.); (D.I.); (M.-M.Z.); (G.F.)
| | - Irina Popescu
- “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania; (I.M.P.); (D.I.); (M.-M.Z.); (G.F.)
| | - Manuela Calin
- Institute of Cellular Biology and Pathology “Nicolae Simionescu” of the Romanian Academy, 050568 Bucharest, Romania; (M.C.); (D.R.); (G.V.)
| | - Daniela Rebleanu
- Institute of Cellular Biology and Pathology “Nicolae Simionescu” of the Romanian Academy, 050568 Bucharest, Romania; (M.C.); (D.R.); (G.V.)
| | - Geanina Voicu
- Institute of Cellular Biology and Pathology “Nicolae Simionescu” of the Romanian Academy, 050568 Bucharest, Romania; (M.C.); (D.R.); (G.V.)
| | - Daniela Ionita
- “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania; (I.M.P.); (D.I.); (M.-M.Z.); (G.F.)
| | - Marius-Mihai Zaharia
- “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania; (I.M.P.); (D.I.); (M.-M.Z.); (G.F.)
| | - Marieta Constantin
- “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania; (I.M.P.); (D.I.); (M.-M.Z.); (G.F.)
| | - Gheorghe Fundueanu
- “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania; (I.M.P.); (D.I.); (M.-M.Z.); (G.F.)
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