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Gomes OJS, Leitão A, Gaspar MC, Vitorino C, Sousa JJS, de Sousa HC, Braga MEM, Gando-Ferreira LM. Fortified chocolate mousse with powder and extract from Moringa oleifera leaves for nutritional value improvement. Food Chem 2024; 441:138338. [PMID: 38194794 DOI: 10.1016/j.foodchem.2023.138338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 12/26/2023] [Accepted: 12/28/2023] [Indexed: 01/11/2024]
Abstract
This study focuses on the characterisation and incorporation of Moringa oleifera leaf powder (MOP) from Luanda (Angola) and its extract (MOE) in fortified chocolate mousse. Dark green (DG) leaves presented superior nutritional values compared to other leaves. DG contained a higher concentration of mineral salts (10 ± 1 mg/100 g of dry leaves), phenolic compounds (267 ± 4 mg GAE/g), vitamins (1.9 ± 0.2 mg/g of dry extract) and strong antioxidant capacity (IC50, 115 ± 8 µg/mL). Therefore, DG leaves were used to fortify the chocolate mousse. The leaves were prepared in three samples: control, 2 % MOP (w/w) and 2 % MOE (v/v). Textural and rheological analysis of chocolate mousse samples revealed a pseudoplastic profile for all samples, with decreased texture attributes and viscosity due to the incorporation. The sensory evaluation demonstrated that MOP and MOE samples presented 93 % and 88 % resemblance to the original product regarding general acceptance, respectively.
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Affiliation(s)
- Olívia J S Gomes
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Faculty of Sciences and Technology, Pólo II, Rua Sílvio Lima, 3030-790 Coimbra, Portugal
| | - Anabela Leitão
- LESRA-Laboratory of Separation, Reaction and Environmental Engineering, Faculty of Engineering, Agostinho Neto University, Av. Ho Chimin no 201, Luanda, Angola
| | - Marisa C Gaspar
- Centre for Innovative Care and Health Technology (ciTechCare), Polytechnic Institute of Leiria, 2410-541 Leiria, Portugal; ESSLei-School of Health Sciences, Polytechnic Institute of Leiria, 2411-901 Leiria, Portugal
| | - Carla Vitorino
- Faculty of Pharmacy, University of Coimbra, Pólo das Ciências da Saúde, Azinhaga de Santa Comba, 3000-548 Coimbra, Portugal; Coimbra Chemistry Centre, Institute of Molecular Sciences-IMS, Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal
| | - João J S Sousa
- Faculty of Pharmacy, University of Coimbra, Pólo das Ciências da Saúde, Azinhaga de Santa Comba, 3000-548 Coimbra, Portugal; Coimbra Chemistry Centre, Institute of Molecular Sciences-IMS, Department of Chemistry, University of Coimbra, Rua Larga, 3004-535 Coimbra, Portugal
| | - Hermínio C de Sousa
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Faculty of Sciences and Technology, Pólo II, Rua Sílvio Lima, 3030-790 Coimbra, Portugal
| | - Mara E M Braga
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Faculty of Sciences and Technology, Pólo II, Rua Sílvio Lima, 3030-790 Coimbra, Portugal.
| | - Licínio M Gando-Ferreira
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Faculty of Sciences and Technology, Pólo II, Rua Sílvio Lima, 3030-790 Coimbra, Portugal.
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Bento CSA, Carrelo H, Alarico S, Empadinhas N, de Sousa HC, Teresa Cidade M, Braga MEM. Effect of ScCO 2 on the decontamination of PECs-based cryogels: A comparison with H 2O steam and H 2O 2 nebulization methods. Int J Pharm 2023; 646:123451. [PMID: 37774759 DOI: 10.1016/j.ijpharm.2023.123451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/25/2023] [Accepted: 09/26/2023] [Indexed: 10/01/2023]
Abstract
Biopolymers present ideal properties to be used in wound dressing solutions. By mixing two oppositely charged macromolecules it is possible to form polyelectrolyte complex (PEC) based cryogels using lyophilization. Their application in the biomedical field is limited due to their sterilization requirements, as conventional methods compromise their physicochemical properties. ScCO2 appears as an alternative method for decontamination. This work assessed several cryogel PEC formulations, chitosan-pectin, gelatine-xanthan gum and alginate-gelatine. PEC formation was confirmed by FTIR and rheological analysis. While steam sterilization compromised cryogels' chemical and morphological properties, decontamination with scCO2 proved to be a promising method for decontamination of PEC-cryogels, because, similarly to what is observed with hydrogen peroxide, it does not compromise their physicochemical properties.
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Affiliation(s)
- Cristiana S A Bento
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal
| | - Henrique Carrelo
- i3N/CENIMAT, Department of Materials Science, NOVA School of Science and Technology (FCT NOVA), Campus de Caparica, 2829-516 Caparica, Portugal
| | - Susana Alarico
- Center for Neuroscience and Cell Biology (CNC) and Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, Rua Larga, Faculty of Medicine, Polo I, 1st floor, 3004-504 Coimbra, Portugal; Institute for Interdisciplinary Research (IIIUC), University of Coimbra, Casa Costa Alemão - Pólo II, 3030-789 Coimbra, Portugal
| | - Nuno Empadinhas
- Center for Neuroscience and Cell Biology (CNC) and Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, Rua Larga, Faculty of Medicine, Polo I, 1st floor, 3004-504 Coimbra, Portugal; Institute for Interdisciplinary Research (IIIUC), University of Coimbra, Casa Costa Alemão - Pólo II, 3030-789 Coimbra, Portugal
| | - Hermínio C de Sousa
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal
| | - Maria Teresa Cidade
- i3N/CENIMAT, Department of Materials Science, NOVA School of Science and Technology (FCT NOVA), Campus de Caparica, 2829-516 Caparica, Portugal
| | - Mara E M Braga
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal.
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Cardoso JMS, Esteves I, Egas C, Braga MEM, de Sousa HC, Abrantes I, Maleita C. Transcriptome analysis reveals the high ribosomal inhibitory action of 1,4-naphthoquinone on Meloidogyne luci infective second-stage juveniles. Front Plant Sci 2023; 14:1191923. [PMID: 37342130 PMCID: PMC10277735 DOI: 10.3389/fpls.2023.1191923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 05/03/2023] [Indexed: 06/22/2023]
Abstract
The root-knot nematode (RKN) Meloidogyne luci presents a threat to the production of several important crops. This nematode species was added to the European Plant Protection Organization Alert list in 2017. The scarce availability of efficient nematicides to control RKN and the phasing out of nematicides from the market have intensified the search for alternatives, such as phytochemicals with bionematicidal properties. The nematicidal activity of 1,4-naphthoquinone (1,4-NTQ) against M. luci has been demonstrated; however, knowledge of the potential mode(s) of action of this compound is still scarce. In this study, the transcriptome profile of M. luci second-stage juveniles (J2), the infective stage, in response to 1,4-NTQ exposure was determined by RNA-seq to identify genes and pathways that might be involved in 1,4-NTQ's mode(s) of action. Control treatments, consisting of nematodes exposed to Tween® 80 (1,4-NTQ solvent) and to water, were included in the analysis. A large set of differentially expressed genes (DEGs) was found among the three tested conditions, and a high number of downregulated genes were found between 1,4-NTQ treatment and water control, reflecting the inhibitory effect of this compound on M. luci, with a great impact on processes related to translation (ribosome pathway). Several other nematode gene networks and metabolic pathways affected by 1,4-NTQ were also identified, clarifying the possible mode of action of this promising bionematicide.
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Affiliation(s)
- Joana M. S. Cardoso
- Centre for Functional Ecology - Science for People and The Planet, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
| | - Ivânia Esteves
- Centre for Functional Ecology - Science for People and The Planet, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
| | - Conceição Egas
- Center for Neuroscience and Cell Biology, Faculdade de Medicina, University of Coimbra, Coimbra, Portugal
- Biocant-Transfer Technology Center, BiocantPark, Cantanhede, Portugal
| | - Mara E. M. Braga
- Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, Coimbra, Portugal
| | - Hermínio C. de Sousa
- Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, Coimbra, Portugal
| | - Isabel Abrantes
- Centre for Functional Ecology - Science for People and The Planet, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
| | - Carla Maleita
- Centre for Functional Ecology - Science for People and The Planet, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
- Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, Coimbra, Portugal
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Henriques J, Pina J, Braga MEM, Dias AMA, Coimbra P, de Sousa HC. Novel Oxygen- and Curcumin-Laden Ionic Liquid@Silica Nanocapsules for Enhanced Antimicrobial Photodynamic Therapy. Pharmaceutics 2023; 15:pharmaceutics15041080. [PMID: 37111567 PMCID: PMC10140864 DOI: 10.3390/pharmaceutics15041080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 03/22/2023] [Accepted: 03/23/2023] [Indexed: 03/30/2023] Open
Abstract
The efficiency of photodynamic therapy is often limited by the scarcity of oxygen at the target site. To address this problem, this work proposes the development of a new nanosystem for antimicrobial photodynamic therapy applications (aPDT) where the natural-origin photosensitizer curcumin (CUR) is immersed in an oxygen-rich environment. Inspired by the perfluorocarbon-based photosensitizer/O2 nanocarriers reported in the literature, we developed a new type of silica nanocapsule containing curcumin dissolved in three hydrophobic ionic liquids (ILs) with high oxygen dissolving capacities. The nanocapsules (CUR-IL@ncSi), prepared by an original oil-in-water microemulsion/sol-gel method, had a high IL content and exhibited clear capacities to dissolve and release significant amounts of oxygen, as demonstrated by deoxygenation/oxygenation studies. The ability of CUR-IL solutions and of CUR-IL@ncSi to generate singlet oxygen (1O2) upon irradiation was confirmed by the detection of 1O2 phosphorescence at 1275 nm. Furthermore, the enhanced capacities of oxygenated CUR-IL@ncSi suspensions to generate 1O2 upon irradiation with blue light were confirmed by an indirect spectrophotometric method. Finally, preliminary microbiological tests using CUR-IL@ncSi incorporated into gelatin films showed the occurrence of antimicrobial effects due to photodynamic inactivation, with their relative efficiencies depending on the specific IL in which curcumin was dissolved. Considering these results, CUR-IL@ncSi has the potential to be used in the future to develop biomedical products with enhanced oxygenation and aPDT capacities.
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Affiliation(s)
- Joana Henriques
- Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal
| | - João Pina
- Coimbra Chemistry Centre-Institute of Molecular Sciences, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Mara E. M. Braga
- Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal
| | - Ana M. A. Dias
- Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal
| | - Patrícia Coimbra
- Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal
- Correspondence: (P.C.); (H.C.d.S.)
| | - Hermínio C. de Sousa
- Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal
- Correspondence: (P.C.); (H.C.d.S.)
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S A Bento C, Gaspar MC, Coimbra P, de Sousa HC, E M Braga M. A review of conventional and emerging technologies for hydrogels sterilization. Int J Pharm 2023; 634:122671. [PMID: 36736965 DOI: 10.1016/j.ijpharm.2023.122671] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 01/26/2023] [Accepted: 01/28/2023] [Indexed: 02/04/2023]
Abstract
Hydrogels are extensively used in the biomedical field, as drug delivery systems, wound dressings, contact lenses or as scaffolds for tissue engineering. Due to their polymeric nature and the presence of high amounts of water in their structure, hydrogels generally present high sensitivity to terminal sterilization. The establishment of an efficient sterilization protocol that does not compromise the functional properties of the hydrogels is one of the challenges faced by researchers when developing a hydrogel for a specific application. Yet, until very recently this aspect was largely ignored in the literature. The present paper reviews the state of literature concerning hydrogels sterilization, compiling the main findings. Conventional terminal sterilization methods (heat sterilization, radiation sterilization, and gas sterilization) as well as emerging sterilization techniques (ozone, supercritical carbon dioxide) are covered. Considerations about aseptic processing are also included. Additionally, and as a framework, hydrogels' polymeric materials, types of networks, and main biomedical applications are summarily described.
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Affiliation(s)
- Cristiana S A Bento
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Marisa C Gaspar
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal; Center for Innovative Care and Health Technology (ciTechCare), Polytechnic of Leiria, 2410-541 Leiria, Portugal
| | - Patrícia Coimbra
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Hermínio C de Sousa
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Mara E M Braga
- University of Coimbra, CIEPQPF, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal.
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Braga ME, Gaspar MC, de Sousa HC. Supercritical fluid technology for agrifood materials processing. Curr Opin Food Sci 2023. [DOI: 10.1016/j.cofs.2022.100983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Lordelo R, Botelho JRS, Morais PV, de Sousa HC, Branco R, Dias AMA, Reis MS. Evaluation of the Microbiological Effectiveness of Three Accessible Mask Decontamination Methods and Their Impact on Filtration, Air Permeability and Physicochemical Properties. Int J Environ Res Public Health 2022; 19:ijerph19116567. [PMID: 35682153 PMCID: PMC9180249 DOI: 10.3390/ijerph19116567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 05/23/2022] [Accepted: 05/24/2022] [Indexed: 11/16/2022]
Abstract
The need to secure public health and mitigate the environmental impact associated with the massified use of respiratory protective devices (RPD) has been raising awareness for the safe reuse of decontaminated masks by individuals and organizations. Among the decontamination treatments proposed, in this work, three methods with the potential to be adopted by households and organizations of different sizes were analysed: contact with nebulized hydrogen peroxide (H2O2); immersion in commercial bleach (NaClO) (sodium hypochlorite, 0.1% p/v); and contact with steam in microwave steam-sanitizing bags (steam bag). Their decontamination effectiveness was assessed using reference microorganisms following international standards (issued by ISO and FDA). Furthermore, the impact on filtration efficiency, air permeability and several physicochemical and structural characteristics of the masks, were evaluated for untreated masks and after 1, 5 and 10 cycles of treatment. Three types of RPD were analysed: surgical, KN95, and cloth masks. Results demonstrated that the H2O2 protocol sterilized KN95 and surgical masks (reduction of >6 log10 CFUs) and disinfected cloth masks (reduction of >3 log10 CFUs). The NaClO protocol sterilized surgical masks, and disinfected KN95 and cloth masks. Steam bags sterilized KN95 and disinfected surgical and cloth masks. No relevant impact was observed on filtration efficiency.
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Affiliation(s)
- Roberta Lordelo
- Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal; (R.L.); (R.B.)
| | - José Rafael S. Botelho
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal; (J.R.S.B.); (H.C.d.S.); (A.M.A.D.)
| | - Paula V. Morais
- Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal; (R.L.); (R.B.)
- Correspondence: (P.V.M.); (M.S.R.)
| | - Hermínio C. de Sousa
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal; (J.R.S.B.); (H.C.d.S.); (A.M.A.D.)
| | - Rita Branco
- Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal; (R.L.); (R.B.)
| | - Ana M. A. Dias
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal; (J.R.S.B.); (H.C.d.S.); (A.M.A.D.)
| | - Marco S. Reis
- Chemical Process Engineering and Forest Products Research Centre (CIEPQPF), Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal; (J.R.S.B.); (H.C.d.S.); (A.M.A.D.)
- Correspondence: (P.V.M.); (M.S.R.)
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Maleita C, Esteves I, Braga MEM, Figueiredo J, Gaspar MC, Abrantes I, de Sousa HC. Juglone and 1,4-Naphthoquinone-Promising Nematicides for Sustainable Control of the Root Knot Nematode Meloidogyne luci. Front Plant Sci 2022; 13:867803. [PMID: 35656011 PMCID: PMC9152545 DOI: 10.3389/fpls.2022.867803] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 04/19/2022] [Indexed: 05/16/2023]
Abstract
The scarce availability of efficient and eco-friendly nematicides to control root-knot nematodes (RKN), Meloidogyne spp., has encouraged research toward the development of bionematicides. Naphthoquinones, juglone (JUG) and 1,4-naphthoquinone (1,4-NTQ), are being explored as alternatives to synthetic nematicides to control RKN. This study expands the knowledge on the effects of these natural compounds toward M. luci life cycle (mortality, hatching, penetration, reproduction). M. luci second-stage juveniles (J2)/eggs were exposed to each compound (250, 150, 100, 50, and 20 ppm) to monitor nematode mortality and hatching during 72 h and 15 days, respectively. Tomato seedlings were then inoculated with 200 J2, which had been exposed to JUG/1,4-NTQ for 3 days. The number of nematodes inside the roots was determined at 3 days after inoculation, and the final population density was assessed at 45 days after inoculation. Moreover, the potential mode of action of JUG/1,4-NTQ was investigated for the first time on RKN, through the assessment of reactive oxygen species (ROS) generation, acetylcholinesterase (AChE) in vitro inhibitory activity and expression analysis of ache and glutathione-S-transferase (gst) genes. 1,4-NTQ was the most active compound, causing ≥50% J2 mortality at 250 ppm, within 24 h. At 20 and 50 ppm, hatching was reduced by ≈50% for both compounds. JUG showed a greater effect on M. luci penetration and reproduction, decreasing infection by ≈80% (50 ppm) on tomato plants. However, 1,4-NTQ-induced generation of ROS and nematode vacuolization was observed. Our study confirms that JUG/1,4-NTQ are promising nematicidal compounds, and new knowledge on their physiological impacts on Meloidogyne was provided to open new avenues for the development of innovative sustainable nematicides.
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Affiliation(s)
- Carla Maleita
- Department of Chemical Engineering, Chemical Process Engineering and Forest Products Research Centre, University of Coimbra, Coimbra, Portugal
- Department of Life Sciences, Centre for Functional Ecology – Science for People and the Planet, University of Coimbra, Coimbra, Portugal
| | - Ivânia Esteves
- Department of Life Sciences, Centre for Functional Ecology – Science for People and the Planet, University of Coimbra, Coimbra, Portugal
| | - Mara E. M. Braga
- Department of Chemical Engineering, Chemical Process Engineering and Forest Products Research Centre, University of Coimbra, Coimbra, Portugal
| | - Joana Figueiredo
- Department of Life Sciences, Centre for Functional Ecology – Science for People and the Planet, University of Coimbra, Coimbra, Portugal
| | - Marisa C. Gaspar
- Department of Chemical Engineering, Chemical Process Engineering and Forest Products Research Centre, University of Coimbra, Coimbra, Portugal
| | - Isabel Abrantes
- Department of Life Sciences, Centre for Functional Ecology – Science for People and the Planet, University of Coimbra, Coimbra, Portugal
| | - Hermínio C. de Sousa
- Department of Chemical Engineering, Chemical Process Engineering and Forest Products Research Centre, University of Coimbra, Coimbra, Portugal
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Marceneiro S, Lobo I, Dias I, de Pinho E, M. A. Dias A, de Sousa HC. Eco-friendlier and sustainable natural-based additives for poly(vinyl chloride)-based composites. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.02.057] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Boia R, Dias PA, Galindo-Romero C, Ferreira H, Aires ID, Vidal-Sanz M, Agudo-Barriuso M, Bernardes R, Santos PF, de Sousa HC, Ambrósio AF, Braga ME, Santiago AR. Intraocular implants loaded with A3R agonist rescue retinal ganglion cells from ischemic damage. J Control Release 2022; 343:469-481. [DOI: 10.1016/j.jconrel.2022.02.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 12/16/2021] [Accepted: 02/01/2022] [Indexed: 12/20/2022]
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Syed UT, Dias AM, Crespo J, Brazinha C, de Sousa HC. Studies on the formation and stability of perfluorodecalin nanoemulsions by ultrasound emulsification using novel surfactant systems. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126315] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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12
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Silva D, de Sousa HC, Gil MH, Santos LF, Oom MS, Alvarez-Lorenzo C, Saramago B, Serro AP. Moxifloxacin-imprinted silicone-based hydrogels as contact lens materials for extended drug release. Eur J Pharm Sci 2021; 156:105591. [PMID: 33065225 DOI: 10.1016/j.ejps.2020.105591] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 09/21/2020] [Accepted: 10/05/2020] [Indexed: 11/26/2022]
Abstract
Contact lenses may act as drug release platforms for the treatment of ocular infections, but there is still the need for extending their typical release periods and enhancing ocular bioavailability. The present study aimed to develop a molecularly imprinted silicone-based hydrogel to be used in the manufacturing of contact lenses that can be loaded efficiently and be able to release the antibiotic moxifloxacin hydrochloride (MXF) in a sustained way. A set of hydrogels was prepared by the molecular imprinting method using acrylic acid (AA) as the functional monomer for the specific recognition of MXF. The modified hydrogels loaded a higher amount of MXF, which was released for a longer time. In vitro experiments, using a microfluidic cell to mimic the ocular surface fluid turnover, showed that the imprinted hydrogel TRIS(300)-I prepared with the highest content in AA led to MXF concentrations in the release medium which were effective against S. aureus and S. epidermidis for about 2 weeks. Furthermore, some important properties such as water uptake, wettability, transmittance, ionic permeability, and Young´s modulus of the modified hydrogel remained within the range of values recommended for contact lenses. No cytotoxicity and no potential ocular irritancy effect were detected. Such hydrogel seems to be a promising alternative to the current options for the treatment of ocular infections.
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Affiliation(s)
- Diana Silva
- Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Hermínio C de Sousa
- Univ Coimbra, CIEPQPF, FCTUC, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra
| | - Maria Helena Gil
- Univ Coimbra, CIEPQPF, FCTUC, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra
| | - Luís F Santos
- Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Madalena Salema Oom
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz,2829-511 Caparica, Portugal
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma Group (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Benilde Saramago
- Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Ana Paula Serro
- Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.; Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz,2829-511 Caparica, Portugal.
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13
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Silva D, de Sousa HC, Gil MH, Santos LF, Amaral RA, Saraiva JA, Salema-Oom M, Alvarez-Lorenzo C, Serro AP, Saramago B. Imprinted hydrogels with LbL coating for dual drug release from soft contact lenses materials. Mater Sci Eng C Mater Biol Appl 2020; 120:111687. [PMID: 33545849 DOI: 10.1016/j.msec.2020.111687] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 10/25/2020] [Accepted: 10/27/2020] [Indexed: 12/17/2022]
Abstract
A combined strategy to control the release of two drugs, one anti-inflammatory (diclofenac sodium, DCF) and one antibiotic (moxifloxacin hydrochloride, MXF), from a soft contact lens (SCL) material, was assessed. The material was a silicone-based hydrogel, which was modified by molecular imprinting with MXF and coated by the layer-by-layer (LbL) method using natural polyelectrolytes: alginate (ALG), poly-l-lysine (PLL) and hyaluronate (HA), crosslinked with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC). Imprinting was used to increase the amount of MXF loaded and to sustain its release, while the LbL coating acted as a diffusion barrier for DCF and improved the surface properties. The drugs were loaded by soaking in a DCF + MXF dual solution. High hydrostatic pressure (HHP) was successfully applied in the sterilization of the drug-loaded hydrogels. The transmittance, refractive index, wettability and ionic permeability of the hydrogels remained within the required levels for SCLs application. The concentrations of the released DCF and MXF stayed above the IC50 and the MIC (for S. aureus and S. epidermidis) values, for 9 and 10 days, respectively. No ocular irritancy was detected by the HET-CAM test. NIH/3T3 cell viability demonstrated that the drug-loaded hydrogels were not toxic, and cell adhesion was reduced.
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Affiliation(s)
- Diana Silva
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Hermínio C de Sousa
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Maria Helena Gil
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Luís F Santos
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Renata A Amaral
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Jorge A Saraiva
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Madalena Salema-Oom
- CIIEM, Instituto Superior de Ciências da Saúde Egas Moniz, Campus Universitário, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Ana Paula Serro
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal; CIIEM, Instituto Superior de Ciências da Saúde Egas Moniz, Campus Universitário, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal
| | - Benilde Saramago
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal.
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14
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Silva D, de Sousa HC, Gil MH, Santos LF, Moutinho GM, Salema-Oom M, Alvarez-Lorenzo C, Serro AP, Saramago B. Diclofenac sustained release from sterilised soft contact lens materials using an optimised layer-by-layer coating. Int J Pharm 2020; 585:119506. [PMID: 32512224 DOI: 10.1016/j.ijpharm.2020.119506] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 06/01/2020] [Accepted: 06/02/2020] [Indexed: 11/25/2022]
Abstract
A layer-by-layer (LbL) coating was designed using ionic polysaccharides (chitosan, sodium alginate, sodium hyaluronate) and genipin (crosslinker), to sustain the release of diclofenac sodium salt (DCF) from soft contact lens (SCL) materials. The coating was hydrophilic, biocompatible, non-toxic, reduced bacterial growth and had minor effects on the physical properties of the material, such as wettability, ionic permeability, refractive index and transmittance, which remained within the recommended values for SCLs. The coating was applied on a silicone-based hydrogel and on commercial SofLens and Purevision SCLs. The coating attenuated the initial drug burst and extended the therapeutic period for, at least, two weeks. Relevantly, the problems of sterilizing drug loaded SCLs coated with biopolymers, using classic methods that involve high temperature or radiation, were successfully solved through high hydrostatic pressure (HHP) sterilization.
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Affiliation(s)
- Diana Silva
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Hermínio C de Sousa
- Univ Coimbra, CIEPQPF, FCTUC, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Maria Helena Gil
- Univ Coimbra, CIEPQPF, FCTUC, Department of Chemical Engineering, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Luís F Santos
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Guilhermina Martins Moutinho
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, 2829-511 Caparica, Portugal
| | - Madalena Salema-Oom
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, 2829-511 Caparica, Portugal
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Ana Paula Serro
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, 2829-511 Caparica, Portugal
| | - Benilde Saramago
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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15
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16
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Seabra IJ, Braga ME, Oliveira RA, de Sousa HC. Two-step high pressure solvent extraction of walnut (Juglans regia L.) husks: scCO2 + CO2/ethanol/H2O. J CO2 UTIL 2019. [DOI: 10.1016/j.jcou.2019.07.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Boia R, Dias PA, Martins JM, Galindo-Romero C, Aires ID, Vidal-Sanz M, Agudo-Barriuso M, de Sousa HC, Ambrósio AF, Braga ME, Santiago AR. Porous poly(ε-caprolactone) implants: A novel strategy for efficient intraocular drug delivery. J Control Release 2019; 316:331-348. [DOI: 10.1016/j.jconrel.2019.09.023] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 09/26/2019] [Accepted: 09/29/2019] [Indexed: 01/22/2023]
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18
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Dias AMA, Costa S, Simões PN, de Sousa HC. Thermal Stability and Non-isothermal Kinetic Analysis of Suspension Poly(vinyl chloride) Films Formulated with Phosphonium-Based Ionic Liquids. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b00548] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Ana M. A. Dias
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II−Pinhal
de Marrocos, 3030-790 Coimbra, Portugal
| | - Samaritana Costa
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II−Pinhal
de Marrocos, 3030-790 Coimbra, Portugal
| | - Pedro N. Simões
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II−Pinhal
de Marrocos, 3030-790 Coimbra, Portugal
| | - Hermínio C. de Sousa
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II−Pinhal
de Marrocos, 3030-790 Coimbra, Portugal
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19
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Pires ALR, de Azevedo Motta L, Dias AM, de Sousa HC, Moraes ÂM, Braga ME. Towards wound dressings with improved properties: Effects of poly(dimethylsiloxane) on chitosan-alginate films loaded with thymol and beta-carotene. Materials Science and Engineering: C 2018; 93:595-605. [DOI: 10.1016/j.msec.2018.08.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 07/15/2018] [Accepted: 08/02/2018] [Indexed: 01/22/2023]
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20
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Marceneiro S, Alves R, Lobo I, Dias I, de Pinho E, Dias AMA, Rasteiro MG, C. de Sousa H. Effects of Poly(vinyl chloride) Morphological Properties on the Rheology/Aging of Plastisols and on the Thermal/Leaching Properties of Films Formulated Using Nonconventional Plasticizers. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.7b03097] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sofia Marceneiro
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
- TMG Automotive, S. Cosme
do Vale, Apartado 14, 4761-912 Vila Nova de Famalicão, Portugal
| | - Rafael Alves
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Irene Lobo
- TMG Automotive, S. Cosme
do Vale, Apartado 14, 4761-912 Vila Nova de Famalicão, Portugal
| | - Isabel Dias
- TMG Automotive, S. Cosme
do Vale, Apartado 14, 4761-912 Vila Nova de Famalicão, Portugal
| | - Elizabete de Pinho
- TMG Automotive, S. Cosme
do Vale, Apartado 14, 4761-912 Vila Nova de Famalicão, Portugal
| | - Ana M. A. Dias
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - M. Graça Rasteiro
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Hermínio C. de Sousa
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II − Pinhal de Marrocos, 3030-790 Coimbra, Portugal
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21
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Gañán NA, Dias AM, Bombaldi F, Zygadlo JA, Brignole EA, de Sousa HC, Braga ME. Alkaloids from Chelidonium majus L.: Fractionated supercritical CO2 extraction with co-solvents. Sep Purif Technol 2016. [DOI: 10.1016/j.seppur.2016.04.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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de Matos MBC, Puga AM, Alvarez-Lorenzo C, Concheiro A, Braga MEM, de Sousa HC. Osteogenic poly(ε-caprolactone)/poloxamine homogeneous blends prepared by supercritical foaming. Int J Pharm 2014; 479:11-22. [PMID: 25541145 DOI: 10.1016/j.ijpharm.2014.12.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2014] [Revised: 12/17/2014] [Accepted: 12/19/2014] [Indexed: 11/16/2022]
Abstract
Homogeneous poly(ε-caprolactone) (PCL) and poloxamines (PLXs) porous blends were prepared using a supercritical carbon dioxide-assisted foaming/mixing (SFM) approach aiming to obtain cytocompatible implantable materials presenting tunable morphologies, bioerosion rates, bioactive molecules release and osteogenic features. Pure PCL, pure PLXs (T908 and T1107 varieties) and three distinct PCL:PLX 75:25, 50:50, 25:75% w/w blends, with and without the osteogenic and angiogenic bioactive molecule simvastatin were processed at constant pressure of 20 MPa and temperature of 40 °C or 43 °C, for T1107 and T908, respectively. Obtained porous blends were characterized applying a wide range of techniques and in vitro methods. Calorimetric analysis showed that hydrophilic T908 and T1107 PLXs are miscible with PCL for all tested compositions. Prepared PCL:PLX porous blends rapidly lost mass when immersed into phosphate buffer pH 7.4 due to PLXs dissolution and then went through slow and almost constant erosion rates for the subsequent weeks due to PCL slow hydrolytic degradation, which explains the rapid initial release of simvastatin and its subsequent sustained release for longer periods of time. PCL and PCL:PLX 75:25% w/w porous blends, containing or not simvastatin, showed a high cytocompatibility with SAOS-2 cells. In addition, prepared biomaterials promoted mesenchymal stem cells proliferation and their differentiation into osteoblasts. Overall, obtained results showed novel possibilities of addressing local treatment of small bone defects/fractures using highly porous PCL:PLX homogeneous blends.
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Affiliation(s)
- Maria B C de Matos
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II-Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Ana M Puga
- Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain; Instituto de Ortopedia y Banco de Tejidos Musculoesqueléticos, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain.
| | - Angel Concheiro
- Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain
| | - Mara E M Braga
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II-Pinhal de Marrocos, 3030-790 Coimbra, Portugal.
| | - Hermínio C de Sousa
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II-Pinhal de Marrocos, 3030-790 Coimbra, Portugal.
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23
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Marceneiro S, Hu Q, Dias AMA, Lobo I, Dias I, de Pinho E, Rasteiro MG, de Sousa HC. Effects of Two Phosphonium-Type Ionic Liquids on the Rheological and Thermomechanical Properties of Emulsion Poly(vinyl chloride)-Based Formulations Plasticized with DINP and CITROFOL. Ind Eng Chem Res 2014. [DOI: 10.1021/ie502382a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sofia Marceneiro
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal
- TMG Automotive, Apartado
14, São Cosme do Vale, 4761-912 Vila Nova de Famalicão, Portugal
| | - Qingyun Hu
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Ana M. A. Dias
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Irene Lobo
- TMG Automotive, Apartado
14, São Cosme do Vale, 4761-912 Vila Nova de Famalicão, Portugal
| | - Isabel Dias
- TMG Automotive, Apartado
14, São Cosme do Vale, 4761-912 Vila Nova de Famalicão, Portugal
| | - Elizabete de Pinho
- TMG Automotive, Apartado
14, São Cosme do Vale, 4761-912 Vila Nova de Famalicão, Portugal
| | - M. Graça Rasteiro
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal
| | - Hermínio C. de Sousa
- CIEPQPF,
Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal
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24
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Alves P, Pinto S, Ferreira P, Kaiser JP, Bruinink A, de Sousa HC, Gil MH. Improving cell adhesion: development of a biosensor for cell behaviour monitoring by surface grafting of sulfonic groups onto a thermoplastic polyurethane. J Mater Sci Mater Med 2014; 25:2017-26. [PMID: 24854674 DOI: 10.1007/s10856-014-5233-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Accepted: 05/05/2014] [Indexed: 05/23/2023]
Abstract
The surface properties of a material in combination with the mechanical properties are responsible for the material performance in a biological environment as well as the behaviour of the cells which contact with the material. Surface properties such as chemical, physical, biological play an important role in the biomaterials filed. In this work, the surface of a thermoplastic polyurethane film (Elastollan(®)1180A50) was tailored with sulfonic groups by grafting [2-(methacryloxyl)ethyl]-dimethyl-(3-sulfopropyl)-ammonium hydroxide (SB) after a previous surface activation either by Argon plasma or by ultra-violet irradiation. This surface modification had the purpose of improving cell adhesion in order to develop a biosensor able to monitor cell behaviour. The surfaces were characterized by X-ray photoelectron spectroscopy, by atomic force microscopy and by contact angle measurements in order to evaluate the efficiency of the modification. Additionally, blood compatibility studies and cell adhesion tests with human bone marrow cells were performed. These methods allowed the grafting of SB and the results indicate that a higher density of grafting was achieved with previous surface plasma treatment than with UV irradiation. However, for both techniques, the presence of SB functional groups led to a decrease of hydrophobicity and roughness of the surface, together with an improvement of the materials biological performance.
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Affiliation(s)
- P Alves
- CIEPQPF, Departamento de Engenharia Química, Universidade de Coimbra, Polo II, Pinhal de Marrocos, 3030-790, Coimbra, Portugal,
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25
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Moura LI, Dias AM, Leal EC, Carvalho L, de Sousa HC, Carvalho E. Chitosan-based dressings loaded with neurotensin--an efficient strategy to improve early diabetic wound healing. Acta Biomater 2014; 10:843-57. [PMID: 24121197 DOI: 10.1016/j.actbio.2013.09.040] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 09/20/2013] [Accepted: 09/30/2013] [Indexed: 01/17/2023]
Abstract
One important complication of diabetes mellitus is chronic, non-healing diabetic foot ulcers (DFUs). This study aims to develop and use dressings based on chitosan derivatives for the sustained delivery of neurotensin (NT), a neuropeptide that acts as an inflammatory modulator in wound healing. Three different derivatives, namely N-carboxymethyl chitosan, 5-methyl pyrrolidinone chitosan (MPC) and N-succinyl chitosan, are presented as potential biomaterials for wound healing applications. Our results show that MPC has the best fluid handling capacity and delivery profile, also being non-toxic to Raw 264.7 and HaCaT cells. NT-loaded and non-loaded MPC dressings were applied to control/diabetic wounds to evaluate their in vitro/in vivo performance. The results show that the former induced more rapid healing (50% wound area reduction) in the early phases of wound healing in diabetic mice. A NT-loaded MPC foam also reduced expression of the inflammatory cytokine TNF-α (P<0.001) and decreased the amount of inflammatory infiltrate on day 3. On day 10 MMP-9 was reduced in diabetic skin (P<0.001), significantly increasing fibroblast migration and collagen (COL1A1, COL1A2 and COL3A1) expression and deposition. These results suggest that MPC-based dressings may work as an effective support for sustained NT release to reduce DFUs.
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26
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Moura LIF, Dias AMA, Suesca E, Casadiegos S, Leal EC, Fontanilla MR, Carvalho L, de Sousa HC, Carvalho E. Neurotensin-loaded collagen dressings reduce inflammation and improve wound healing in diabetic mice. Biochim Biophys Acta Mol Basis Dis 2013; 1842:32-43. [PMID: 24161538 DOI: 10.1016/j.bbadis.2013.10.009] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 09/25/2013] [Accepted: 10/15/2013] [Indexed: 11/18/2022]
Abstract
Impaired wound healing is an important clinical problem in diabetes mellitus and results in failure to completely heal diabetic foot ulcers (DFUs), which may lead to lower extremity amputations. In the present study, collagen based dressings were prepared to be applied as support for the delivery of neurotensin (NT), a neuropeptide that acts as an inflammatory modulator in wound healing. The performance of NT alone and NT-loaded collagen matrices to treat wounds in streptozotocin (STZ) diabetic induced mice was evaluated. Results showed that the prepared dressings were not-cytotoxic up to 72h after contact with macrophages (Raw 264.7) and human keratinocyte (HaCaT) cell lines. Moreover, those cells were shown to adhere to the collagen matrices without noticeable change in their morphology. NT-loaded collagen dressings induced faster healing (17% wound area reduction) in the early phases of wound healing in diabetic wounded mice. In addition, they also significantly reduced inflammatory cytokine expression namely, TNF-α (p<0.01) and IL-1β (p<0.01) and decreased the inflammatory infiltrate at day 3 post-wounding (inflammatory phase). After complete healing, metalloproteinase 9 (MMP-9) is reduced in diabetic skin (p<0.05) which significantly increased fibroblast migration and collagen (collagen type I, alpha 2 (COL1A2) and collagen type III, alpha 1 (COL3A1)) expression and deposition. These results suggest that collagen-based dressings can be an effective support for NT release into diabetic wound enhancing the healing process. Nevertheless, a more prominent scar is observed in diabetic wounds treated with collagen when compared to the treatment with NT alone.
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Affiliation(s)
- Liane I F Moura
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal; CIEPQPF, Chemical Engineering Department, FCTUC-University of Coimbra, Coimbra, Portugal
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27
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Moura LIF, Dias AMA, Carvalho E, de Sousa HC. Recent advances on the development of wound dressings for diabetic foot ulcer treatment--a review. Acta Biomater 2013; 9:7093-114. [PMID: 23542233 DOI: 10.1016/j.actbio.2013.03.033] [Citation(s) in RCA: 440] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 03/06/2013] [Accepted: 03/21/2013] [Indexed: 12/13/2022]
Abstract
Diabetic foot ulcers (DFUs) are a chronic, non-healing complication of diabetes that lead to high hospital costs and, in extreme cases, to amputation. Diabetic neuropathy, peripheral vascular disease, abnormal cellular and cytokine/chemokine activity are among the main factors that hinder diabetic wound repair. DFUs represent a current and important challenge in the development of novel and efficient wound dressings. In general, an ideal wound dressing should provide a moist wound environment, offer protection from secondary infections, remove wound exudate and promote tissue regeneration. However, no existing dressing fulfills all the requirements associated with DFU treatment and the choice of the correct dressing depends on the wound type and stage, injury extension, patient condition and the tissues involved. Currently, there are different types of commercially available wound dressings that can be used for DFU treatment which differ on their application modes, materials, shape and on the methods employed for production. Dressing materials can include natural, modified and synthetic polymers, as well as their mixtures or combinations, processed in the form of films, foams, hydrocolloids and hydrogels. Moreover, wound dressings may be employed as medicated systems, through the delivery of healing enhancers and therapeutic substances (drugs, growth factors, peptides, stem cells and/or other bioactive substances). This work reviews the state of the art and the most recent advances in the development of wound dressings for DFU treatment. Special emphasis is given to systems employing new polymeric biomaterials, and to the latest and innovative therapeutic strategies and delivery approaches.
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Affiliation(s)
- Liane I F Moura
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
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Bierhalz AC, da Silva MA, de Sousa HC, Braga ME, Kieckbusch TG. Influence of natamycin loading methods on the physical characteristics of alginate active films. J Supercrit Fluids 2013. [DOI: 10.1016/j.supflu.2013.01.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nabais CRJOD, Heron BM, de Sousa HC, Gil MH, Sobral AJFN. Synthesis and Characterization of Co-polymers Based on Methyl Methacrylate and 2-Hexyl Acrylate Containing Naphthopyrans for a Light-Sensitive Contact Lens. Journal of Biomaterials Science, Polymer Edition 2012; 22:139-52. [DOI: 10.1163/092050609x12580984253769] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Cláudia R. J. O. D. Nabais
- a Departamento de Engenharia Mecânica e Gestão Industrial, Faculdade de Engenharia da Universidade do Porto, 4200-465 Porto, Portugal
| | - B. Mark Heron
- b Department of Colour and Polymer Chemistry, University of Leeds, Leeds LS2 9JT, UK
| | - Hermínio C. de Sousa
- c CIEPQPF, Chemical Engineering Department, University of Coimbra, Pólo II–Pinhal de Marrocos, Rua Sílvio Lima, 3030-790 Coimbra, Portugal
| | - Maria H. Gil
- d CIEPQPF, Chemical Engineering Department, University of Coimbra, Pólo II–Pinhal de Marrocos, Rua Sílvio Lima, 3030-790 Coimbra, Portugal
| | - Abílio J. F. N. Sobral
- e Departamento de Química, Faculdade de Ciências e Tecnologia da Universidade de Coimbra, 3004-535 Coimbra, Portugal
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de Sousa HC, Costa MS, Coimbra P, Matias AA, Duarte CM. Experimental determination and correlation of meloxicam sodium salt solubility in supercritical carbon dioxide. J Supercrit Fluids 2012. [DOI: 10.1016/j.supflu.2011.12.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Dias AMA, Marceneiro S, Braga MEM, Coelho JFJ, Ferreira AGM, Simões PN, Veiga HIM, Tomé LC, Marrucho IM, Esperança JMSS, Matias AA, Duarte CMM, Rebelo LPN, de Sousa HC. Phosphonium-based ionic liquids as modifiers for biomedical grade poly(vinyl chloride). Acta Biomater 2012; 8:1366-79. [PMID: 22085860 DOI: 10.1016/j.actbio.2011.10.034] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 09/26/2011] [Accepted: 10/28/2011] [Indexed: 11/16/2022]
Abstract
This work reports and discusses the influence of four phosphonium-based ionic liquids (PhILs), namely trihexyl(tetradecyl) phosphonium dicyanamide, [P(6,6,6,14)][dca]; trihexyl(tetradecyl) phosphonium bis(trifluoromethylsulfonyl)imide, [P(6,6,6,14)][Tf(2)N]; tetrabutyl phosphonium bromide, [P(4,4,4,4)][Br]; and tetrabutyl phosphonium chloride, [P(4,4,4,4)][Cl], on some of the chemical, physical and biological properties of a biomedical-grade suspension of poly(vinyl chloride) (PVC). The main goal of this work was to evaluate the capacity of these PhILs to modify some of the properties of neat PVC, in particular those that may allow their use as potential alternatives to traditional phthalate-based plasticizers in PVC biomedical applications. PVC films having different PhIL compositions (0, 5, 10 and 20 wt.%) were prepared (by solvent film casting) and characterised by Fourier transform infrared, thermogravimetric analysis, differential scanning calorimetry, dynamical mechanical thermal analysis, scanning electron microscopy/energy-dispersive X-ray/electron probe microanalysis, X-ray diffraction, transmittance, permeability towards oxygen and carbon dioxide, thermal degradation, contact angle measurement, water and vapour uptake, leachability and biocompatibility (haemolytic potential, thrombogenicity and cytotoxicity). A conventional organic plasticizer (di-isononyl phthalate) was used for comparison purposes. The results obtained showed that it was possible to change the neat PVC hydrophobicity, and consequently its water uptake capacity and plasticizer leachability, just by changing the PhIL employed and its composition. It was also possible to significantly change the thermal and mechanical properties of PVC films by choosing appropriate PhIL cation/anion combinations. However, a specific PhIL may not always be capable of simultaneously keeping and/or improving both physical properties. In addition, ionic halide salts were found to promote PVC dehydrochlorination. Finally, none of the prepared materials presented toxicity against Caco-2 cells, though pure [P(6,6,6,14)][dca] decreased HepG2 cells viability. Moreover, PVC films with [P(6,6,6,14)][dca] and [P(4,4,4,4)][Cl] were found to be haemolytic and thus these PhILs must be avoided as PVC modifiers if biomedical applications are envisaged. In conclusion, from all the PhILs tested, [P(6,6,6,14)][Tf(2)N] showed the most promising results regarding blood compatibility, leaching and permeability to gases of PVC films. The results presented are a strong indicator that adequate PhILs may be successfully employed as PVC multi-functional plasticizers for a wide range of potential applications, including those in the biomedical field.
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Affiliation(s)
- Ana M A Dias
- CIEPQPF, Chemical Engineering Department, FCTUC, University of Coimbra, Rua Sílvio Lima, Pólo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal.
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Natu MV, Gaspar MN, Fontes Ribeiro CA, Cabrita AM, de Sousa HC, Gil M. In vitro and in vivo evaluation of an intraocular implant for glaucoma treatment. Int J Pharm 2011; 415:73-82. [DOI: 10.1016/j.ijpharm.2011.05.047] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Revised: 05/17/2011] [Accepted: 05/18/2011] [Indexed: 10/18/2022]
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Alves P, Pinto S, de Sousa HC, Gil MH. Surface modification of a thermoplastic polyurethane by low-pressure plasma treatment to improve hydrophilicity. J Appl Polym Sci 2011. [DOI: 10.1002/app.34348] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Yañez F, Martikainen L, Braga MEM, Alvarez-Lorenzo C, Concheiro A, Duarte CMM, Gil MH, de Sousa HC. Supercritical fluid-assisted preparation of imprinted contact lenses for drug delivery. Acta Biomater 2011; 7:1019-30. [PMID: 20934541 DOI: 10.1016/j.actbio.2010.10.003] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Revised: 09/22/2010] [Accepted: 10/04/2010] [Indexed: 01/09/2023]
Abstract
The aim of this work was to develop an innovative supercritical fluid (SCF)-assisted molecular imprinting method to endow commercial soft contact lenses (SCLs) with the ability to load specific drugs and to control their release. This approach seeks to overcome the limitation of the common loading of preformed SCLs by immersion in concentrated drug solutions (only valid for highly water soluble drugs) and of the molecular imprinting methods that require choice of the drug before polymerization and thus to create drug-tailored networks. In particular, we focused on improving the flurbiprofen load/release capacity of daily wear Hilafilcon B commercial SCLs by the use of sequential SCF flurbiprofen impregnation and extraction steps. Supercritical carbon dioxide (scCO2) impregnation assays were performed at 12.0 MPa and 40 °C, while scCO2 extractions were performed at 20.0 MPa and 40 °C. Conventional flurbiprofen sorption and drug removal experiments in aqueous solutions were carried out for comparison purposes. SCF-processed SCLs showed a recognition ability and a higher affinity for flurbiprofen in aqueous solution than for the structurally related ibuprofen and dexamethasone, which suggests the creation of molecularly imprinted cavities driven by both physical (swelling/plasticization) and chemical (carbonyl groups in the network with the C-F group in the drug) interactions. Processing with scCO2 did not alter some of the critical functional properties of SCLs (glass transition temperature, transmittance, oxygen permeability, contact angle), enabled the control of drug loaded/released amounts (by the application of several consecutive processing cycles) and permitted the preparation of hydrophobic drug-based therapeutic SCLs in much shorter process times than those using conventional aqueous-based molecular imprinting methods.
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Affiliation(s)
- Fernando Yañez
- Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain
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Natu MV, Gaspar MN, Ribeiro CAF, Correia IJ, Silva D, de Sousa HC, Gil MH. A poly(ε-caprolactone) device for sustained release of an anti-glaucoma drug. Biomed Mater 2011; 6:025003. [DOI: 10.1088/1748-6041/6/2/025003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Serra AT, Matias AA, Almeida AP, Bronze M, Alves PM, de Sousa HC, Duarte CM. Processing cherries (Prunus avium) using supercritical fluid technology. Part 2. Evaluation of SCF extracts as promising natural chemotherapeutical agents. J Supercrit Fluids 2011. [DOI: 10.1016/j.supflu.2010.06.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Serra AT, Seabra IJ, Braga ME, Bronze M, de Sousa HC, Duarte CM. Processing cherries (Prunus avium) using supercritical fluid technology. Part 1: Recovery of extract fractions rich in bioactive compounds. J Supercrit Fluids 2010. [DOI: 10.1016/j.supflu.2010.06.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Dias AM, Seabra IJ, Braga MM, Gil MH, de Sousa HC. Supercritical solvent impregnation of natural bioactive compounds in N -carboxybutyl chitosan membranes for the development of topical wound healing applications. J Control Release 2010; 148:e33-5. [DOI: 10.1016/j.jconrel.2010.07.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Braga ME, Yañez F, Alvarez-Lorenzo C, Concheiro A, Duarte CM, Gil MH, de Sousa HC. Improved drug loading/release capacities of commercial contact lenses obtained by supercritical fluid assisted molecular imprinting methods. J Control Release 2010; 148:e102-4. [DOI: 10.1016/j.jconrel.2010.07.077] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Seabra IJ, Braga MEM, Batista MT, de Sousa HC. Effect of solvent (CO2/ethanol/H2O) on the fractionated enhanced solvent extraction of anthocyanins from elderberry pomace. J Supercrit Fluids 2010. [DOI: 10.1016/j.supflu.2010.05.001] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Costa VP, Braga ME, Duarte CM, Alvarez-Lorenzo C, Concheiro A, Gil MH, de Sousa HC. Anti-glaucoma drug-loaded contact lenses prepared using supercritical solvent impregnation. J Supercrit Fluids 2010. [DOI: 10.1016/j.supflu.2010.02.007] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Costa VP, Braga ME, Guerra JP, Duarte AR, Duarte CM, Leite EO, Gil MH, de Sousa HC. Development of therapeutic contact lenses using a supercritical solvent impregnation method. J Supercrit Fluids 2010. [DOI: 10.1016/j.supflu.2010.02.001] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Alves P, Kaiser JP, Haack J, Salk N, Bruinink A, de Sousa HC, Gil MH. Surface modification of thermoplastic polyurethane in order to enhance reactivity and avoid cell adhesion. Colloid Polym Sci 2009. [DOI: 10.1007/s00396-009-2116-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Natu MV, Gil M, de Sousa HC. Supercritical solvent impregnation of poly(ɛ-caprolactone)/poly(oxyethylene-b-oxypropylene-b-oxyethylene) and poly(ɛ-caprolactone)/poly(ethylene-vinyl acetate) blends for controlled release applications. J Supercrit Fluids 2008. [DOI: 10.1016/j.supflu.2008.05.006] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Seabra IJ, Braga MEM, Batista MTP, de Sousa HC. Fractioned High Pressure Extraction of Anthocyanins from Elderberry (Sambucus nigra L.) Pomace. FOOD BIOPROCESS TECH 2008. [DOI: 10.1007/s11947-008-0134-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Coimbra P, Fernandes D, Ferreira P, Gil MH, de Sousa HC. Solubility of Irgacure® 2959 photoinitiator in supercritical carbon dioxide: Experimental determination and correlation. J Supercrit Fluids 2008. [DOI: 10.1016/j.supflu.2008.01.014] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Braga ME, Pato MTV, Silva HSC, Ferreira EI, Gil MH, Duarte CM, de Sousa HC. Supercritical solvent impregnation of ophthalmic drugs on chitosan derivatives. J Supercrit Fluids 2008. [DOI: 10.1016/j.supflu.2007.10.002] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Duarte ARC, Martins C, Coimbra P, Gil MH, de Sousa HC, Duarte CM. Sorption and diffusion of dense carbon dioxide in a biocompatible polymer. J Supercrit Fluids 2006. [DOI: 10.1016/j.supflu.2005.12.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Najdanovic-Visak V, Esperança JMSS, Rebelo LPN, Nunes da Ponte M, Guedes HJR, Seddon KR, de Sousa HC, Szydlowski J. Pressure, Isotope, and Water Co-solvent Effects in Liquid−Liquid Equilibria of (Ionic Liquid + Alcohol) Systems. J Phys Chem B 2003. [DOI: 10.1021/jp034576x] [Citation(s) in RCA: 146] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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