1
|
Cardoso CS, de Carvalho FF, Gomes RC, Gianini RJ, Fanelli C, Noronha IDL, Dos Santos NB, Komatsu D, Randazzo-Moura P. New approaches to second-degree burn healing: Polyvinyl alcohol membrane loaded to arnica combined to laser therapy. J Biomater Appl 2024; 38:1058-1072. [PMID: 38470813 DOI: 10.1177/08853282241238609] [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] [Indexed: 03/14/2024]
Abstract
Second-degree burns require greater care, as the damage is more extensive and worrisome and the use of a biomaterial can help in the cell repair process, with better planning, low cost, and better accessibility. Arnica has anti-inflammatory and analgesic properties in skin lesions treatments and laser therapy is another therapeutic alternative for burns. Evaluate the effects of arnica incorporated into PVA associated or not with low intensity laser on burns in rats. PVA and PVA with arnica (PVA+A) were obtained and characterized physicochemically. Through in vivo studies, the effects of PVA and PVA+A with or without the application of laser on the lesions allowed histological and immunohistochemical analyzes. PVA+A was biocompatible and with sustained release of the active, being a promising pharmacological tool and confirmed that laser therapy was effective in accelerating the healing process, due to its potential biomodulator, improving inflammatory aspects, promoting rapid healing in skin lesions.
Collapse
Affiliation(s)
- Carolina Silva Cardoso
- Program of Postgraduate in Biomaterials and Regenerative Medicine, Faculty of Medical and Health Sciences, Pontifical Catholic University of São Paulo (PUC-SP), São Paulo, Brazil
| | - Filipe Feitosa de Carvalho
- Program of Postgraduate in Biomaterials and Regenerative Medicine, Faculty of Medical and Health Sciences, Pontifical Catholic University of São Paulo (PUC-SP), São Paulo, Brazil
| | - Rodrigo César Gomes
- Biomaterials Laboratory, Faculty of Medical and Health Sciences, Pontifical Catholic University of São Paulo (PUC-SP), São Paulo, Brazil
| | - Reinaldo José Gianini
- Program of Postgraduate in Biomaterials and Regenerative Medicine, Faculty of Medical and Health Sciences, Pontifical Catholic University of São Paulo (PUC-SP), São Paulo, Brazil
| | - Camilla Fanelli
- Laboratory of Cellular, Genetic, and Molecular Nephrology, Renal Division, University of São Paulo Medical School (USP), São Paulo, Brazil
| | - Irene de Lourdes Noronha
- Laboratory of Cellular, Genetic, and Molecular Nephrology, Renal Division, University of São Paulo Medical School (USP), São Paulo, Brazil
| | - Nelson Brancaccio Dos Santos
- Biomaterials Laboratory, Faculty of Medical and Health Sciences, Pontifical Catholic University of São Paulo (PUC-SP), São Paulo, Brazil
| | - Daniel Komatsu
- Program of Postgraduate in Biomaterials and Regenerative Medicine, Faculty of Medical and Health Sciences, Pontifical Catholic University of São Paulo (PUC-SP), São Paulo, Brazil
| | - Priscila Randazzo-Moura
- Program of Postgraduate in Biomaterials and Regenerative Medicine, Faculty of Medical and Health Sciences, Pontifical Catholic University of São Paulo (PUC-SP), São Paulo, Brazil
| |
Collapse
|
2
|
Komatsu D, Cabrera ARE, Quevedo BV, Asami J, Cristina Motta A, de Moraes SC, Duarte MAT, Hausen MDA, Aparecida de Rezende Duek E. Meniscal repair with additive manufacture of bioresorbable polymer: From physicochemical characterization to implantation of 3D printed poly (L-co-D, L lactide-co-trimethylene carbonate) with autologous stem cells in rabbits. J Biomater Appl 2024:8853282241248517. [PMID: 38646887 DOI: 10.1177/08853282241248517] [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] [Indexed: 04/23/2024]
Abstract
Three-dimensional (3D) structures are actually the state-of-the-art technique to create porous scaffolds for tissue engineering. Since regeneration in cartilage tissue is limited due to intrinsic cellular properties this study aims to develop and characterize three-dimensional porous scaffolds of poly (L-co-D, L lactide-co-trimethylene carbonate), PLDLA-TMC, obtained by 3D fiber deposition technique. The PLDLA-TMC terpolymer scaffolds (70:30), were obtained and characterized by scanning electron microscopy, gel permeation chromatography, differential scanning calorimetry, thermal gravimetric analysis, compression mechanical testing and study on in vitro degradation, which showed its amorphous characteristics, cylindrical geometry, and interconnected pores. The in vitro degradation study showed significant loss of mechanical properties compatible with a decrease in molar mass, accompanied by changes in morphology. The histocompatibility association of mesenchymal stem cells from rabbit's bone marrow, and PLDLA-TMC scaffolds, were evaluated in the meniscus regeneration, proving the potential of cell culture at in vivo tissue regeneration. Nine New Zealand rabbits underwent total medial meniscectomy, yielding three treatments: implantation of the seeded PLDLA-TMC scaffold, implantation of the unseeded PLDLA-TMC and negative control (defect without any implant). After 24 weeks, the results revealed the presence of fibrocartilage in the animals treated with polymer. However, the regeneration obtained with the seeded PLDLA-TMC scaffolds with mesenchymal stem cells had become intimal to mature fibrocartilaginous tissue of normal meniscus both macroscopically and histologically. This study demonstrated the effectiveness of the PLDLA-TMC scaffold in meniscus regeneration and the potential of mesenchymal stem cells in tissue engineering, without the use of growth factors. It is concluded that bioresorbable polymers represent a promising alternative for tissue regeneration.
Collapse
Affiliation(s)
- Daniel Komatsu
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
| | | | - Bruna Vanessa Quevedo
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
- Post-Graduation Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba, Brazil
| | - Jessica Asami
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
- Post-Graduation Program of School of Mechanical Engineering (FEM), University of Campinas (UNICAMP), Campinas, Brazil
| | - Adriana Cristina Motta
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
| | | | | | - Moema de Alencar Hausen
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
- Post-Graduation Program of Biomaterials and Regenerative Medicine (PPGBMR), Surgery Department, PUC-SP, Sorocaba, Brazil
| | - Eliana Aparecida de Rezende Duek
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
- Post-Graduation Program of School of Mechanical Engineering (FEM), University of Campinas (UNICAMP), Campinas, Brazil
- Post-Graduation Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba, Brazil
- Post-Graduation Program of Biomaterials and Regenerative Medicine (PPGBMR), Surgery Department, PUC-SP, Sorocaba, Brazil
| |
Collapse
|
3
|
Asami J, Quevedo BV, Santos AR, Giorno LP, Komatsu D, de Rezende Duek EA. The impact of non-deproteinization on physicochemical and biological properties of natural rubber latex for biomedical applications. Int J Biol Macromol 2023; 253:126782. [PMID: 37690638 DOI: 10.1016/j.ijbiomac.2023.126782] [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: 06/26/2023] [Revised: 08/29/2023] [Accepted: 09/05/2023] [Indexed: 09/12/2023]
Abstract
Latex is a colloidal suspension derived from the Hevea brasiliensis tree, derived from natural rubber, poly(isoprene), and assorted constituents including proteins and phospholipids. These constituents are inherent to both natural rubber and latex serum. This investigation was undertaken to examine the impact of the deproteinization process on chemical and biological dynamics of natural rubber latex. Natural Rubber (NR) extracted from the pure latex (LNCP) was obtained through centrifugation, followed by six rounds of solvent purification (LP6). The structure was characterized using Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), swelling test, surface zeta potential (ζ), scanning electron microscopy (SEM) and in vitro assay. The results revealed that the LP6 group presented decreased swelling kinetics, reduced cell adhesion and proliferation, and a smoother surface with decreased negative surface charge. Conversely, the LNCP group shown accelerated swelling, heightened adhesion and cellular growth, and a more negatively charged and rougher surface. As such, the attributes of latex serum and proteins have potential usage across numerous biomedical applications.
Collapse
Affiliation(s)
- Jessica Asami
- Mechanical Engineering Faculty (FEM), State University of Campinas (UNICAMP), Campinas, SP, Brazil; Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil.
| | - Bruna V Quevedo
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil; Postgraduate Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba, SP, Brazil
| | - Arnaldo R Santos
- Center of Natural and Human Sciences, Federal University of ABC (UFABC), São Bernardo do Campo, SP, Brazil
| | - Luciana Pastena Giorno
- Center of Natural and Human Sciences, Federal University of ABC (UFABC), São Bernardo do Campo, SP, Brazil
| | - Daniel Komatsu
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil
| | - Eliana Aparecida de Rezende Duek
- Mechanical Engineering Faculty (FEM), State University of Campinas (UNICAMP), Campinas, SP, Brazil; Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil; Postgraduate Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba, SP, Brazil
| |
Collapse
|
4
|
Quevedo BV, Komatsu D, de Lourdes Rezende M, de Rezende Duek EA. Synthesis of epoxidized natural rubber grafted with hyaluronic acid for the development of biomaterials. Int J Biol Macromol 2023; 244:125359. [PMID: 37321441 DOI: 10.1016/j.ijbiomac.2023.125359] [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: 04/19/2023] [Revised: 06/06/2023] [Accepted: 06/10/2023] [Indexed: 06/17/2023]
Abstract
Natural Rubber (NR), extracted from Hevea brasiliensis rubber trees, is a biocompatible biopolymer with properties that support in the tissue repair process. However, its biomedical applications are limited due to the presence of allergenic proteins, hydrophobicity, and unsaturated bonds. To overcome these limitations and contribute to the development of new biomaterials, this study aims to deproteinize, epoxidize, and subject NR to copolymerization by grafting with hyaluronic acid (HA), which is widely recognized for its bioactive properties in the medical field. The deproteinization, epoxidation, and graft copolymerization through the esterification reaction were confirmed by Fourier Transform Infrared Spectroscopy and Hydrogen Nuclear Magnetic Resonance Spectroscopy analysis. Thermogravimetry and Differential Scanning Calorimetry demonstrated that the grafted sample exhibited a lower degradation rate and a higher glass transition temperature, indicating strong intermolecular interactions. Moreover, contact angle measurement revealed that the grafted NR exhibited a high hydrophilic character. The results obtained suggest the formation of a novel material with great potential for application in biomaterials involved in tissue repair processes.
Collapse
Affiliation(s)
- Bruna V Quevedo
- Postgraduate Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba, SP 13565-905, Brazil; Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP 18030-070, Brazil.
| | - Daniel Komatsu
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP 18030-070, Brazil; Department of Polymer, José Crespo Gonzales Faculty of Technology (FATEC), Sorocaba, SP 18013-280, Brazil
| | - Maira de Lourdes Rezende
- Department of Polymer, José Crespo Gonzales Faculty of Technology (FATEC), Sorocaba, SP 18013-280, Brazil
| | - Eliana Aparecida de Rezende Duek
- Postgraduate Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba, SP 13565-905, Brazil; Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP 18030-070, Brazil
| |
Collapse
|
5
|
Pinto MF, Quevedo BV, Asami J, Komatsu D, Hausen MDA, Duek EADR. Electrospun Membrane Based on Poly(L-co-D,L lactic acid) and Natural Rubber Containing Copaiba Oil Designed as a Dressing with Antimicrobial Properties. Antibiotics (Basel) 2023; 12:antibiotics12050898. [PMID: 37237801 DOI: 10.3390/antibiotics12050898] [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: 03/28/2023] [Revised: 05/05/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
Drug delivery systems of natural antimicrobial compounds, such as copaiba oil (CO), have become relevant in the scientific community due to the recent prevalence of the public health complications related to antibiotic resistance. Electrospun devices act as an efficient drug delivery system for these bioactive compounds, reducing systemic side effects and increasing the effectiveness of the treatment. In this way, the present study aimed to evaluate the synergistic and antimicrobial effect of the direct incorporation of different concentrations of CO in a poly(L-co-D,L lactic acid) and natural rubber (NR) electrospun membrane. It was observed that CO showed bacteriostatic and antibacterial effects against S. aureus in antibiogram assays. The prevention of biofilm formation was confirmed via scanning electron microscopy. The test with crystal violet demonstrated strong bacteria inhibition in membranes with 75% CO. A decrease in hydrophilicity, observed in the swelling test, presented that the addition of CO promotes a safe environment for the recovery of injured tissue while acting as an antimicrobial agent. In this way, the study showed strong bacteriostatic effects of the CO incorporation in combination with electrospun membranes, a suitable feature desired in wound dressings in order to promote a physical barrier with prophylactic antimicrobial properties to avoid infections during tissue healing.
Collapse
Affiliation(s)
- Marcelo Formigoni Pinto
- Mechanical Engineering Faculty (FEM), State University of Campinas (UNICAMP), Campinas 13083-860, São Paulo, Brazil
| | - Bruna V Quevedo
- Post-Graduation Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba 18052-780, São Paulo, Brazil
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
| | - Jessica Asami
- Mechanical Engineering Faculty (FEM), State University of Campinas (UNICAMP), Campinas 13083-860, São Paulo, Brazil
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
| | - Daniel Komatsu
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
| | - Moema de Alencar Hausen
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
- Post-Graduation Program of Biomaterials and Regenerative Medicine, Surgery Department, FCMS, PUC-São Paulo, Sorocaba 18030-070, São Paulo, Brazil
| | - Eliana Aparecida de Rezende Duek
- Mechanical Engineering Faculty (FEM), State University of Campinas (UNICAMP), Campinas 13083-860, São Paulo, Brazil
- Post-Graduation Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba 18052-780, São Paulo, Brazil
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
- Post-Graduation Program of Biomaterials and Regenerative Medicine, Surgery Department, FCMS, PUC-São Paulo, Sorocaba 18030-070, São Paulo, Brazil
| |
Collapse
|
6
|
Hausen MDA, Melero AMG, Asami J, Ferreira LM, Gomes da Silva GB, Bissoli MCDA, Marcato VR, Nani BD, Rosalen PL, Alencar SMD, Botaro VR, Komatsu D, Senna A, Duek EADR. In vivo therapeutic evaluation of a cellulose acetate hydrogel cross linked with ethylenediaminetetraacetic-dianhydride containing propolis ethanolic-extract for treating burns. J BIOACT COMPAT POL 2022. [DOI: 10.1177/08839115221106869] [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] [Indexed: 11/16/2022]
Abstract
An increasing interest in regenerative medicine has been an approach with natural products used for assorted skin treatments. Propolis from Apis mellifera species of bees have shown high acceptance due to antimicrobial and anti-inflammatory properties. However, just a few propolis types presents stronger effects in controlling inflammation. The current work describes an organic propolis recently isolated, named as OP6, that presented strong anti-inflammatory influences in vivo when associated with EDTA cross-linked hydrogel, used as a curative device in second-degree burns in a murine model. We developed a cellulose acetate hydrogel cross-linked with ethylenediaminetetraacetic dianhydride (HAC-EDTA) as a polymeric matrix for a bandage based on an ethanolic extract of propolis at 15%, 30%, and 60% (w/v) for treating second-degree burns. In vivo studies were carried out in Wistar rats divided into three groups: negative control (only lesion), positive control (lesion with HAC-EDTA film), and treatment group (lesion with the HAC-EDTA + OP6 at 15%, 30%, and 60%). Each group was randomized and equally subdivided into two subgroups according to the period of bandage wearing (7 and 14 days). Previous work of this research group selected the propolis OP6 sample source as the best candidate for the in vivo study. HAC-EDTA + OP6 15%, 30%, and 60% films demonstrated a concentration-dependent release rate, with the highest amount of propolis released after tests (484.3 mg) by HAC-EDTA enriched with the highest concentrated extract of propolis. HAC-EDTA + OP6 films were efficient in preventing infections, promoting lesion retraction, and tissue regeneration. The HAC-EDTA + OP6 30% treatment was more efficient, revealing a reduced inflammatory process and stimulating skin regeneration. The designed HAC-EDTA + propolis films were shown as promising tools for second-degree burns treatment, accelerating healing process to a full recovery tissue repair after 14 days.
Collapse
Affiliation(s)
- Moema de Alencar Hausen
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Anna Maria Gouvea Melero
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos (DFQM/UFSCAR), Sorocaba, São Paulo, Brazil
| | - Jessica Asami
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
- Faculty of Mechanical Engineering, State University of Campinas (FEM/UNICAMP), São Paulo, Brazil
| | - Lucas Martins Ferreira
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Guilherme Borges Gomes da Silva
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Mariana Cesar de Azeredo Bissoli
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Vanessa Rigoni Marcato
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Bruno Dias Nani
- Piracicaba Dental School, University of Campinas (FOP/UNICAMP), Piracicaba, São Paulo, Brazil
| | - Pedro Luiz Rosalen
- Piracicaba Dental School, University of Campinas (FOP/UNICAMP), Piracicaba, São Paulo, Brazil
| | - Severino Matias de Alencar
- Luiz de Queiroz College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, São Paulo, Brazil
| | - Vagner Roberto Botaro
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos (DFQM/UFSCAR), Sorocaba, São Paulo, Brazil
- Post-Graduation Program in Materials Science (PPGCM), Federal University of São Carlos (UFSCAR), Sorocaba, São Paulo, Brazil
| | - Daniel Komatsu
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - André Senna
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos (DFQM/UFSCAR), Sorocaba, São Paulo, Brazil
| | - Eliana Aparecida de Rezende Duek
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
- Faculty of Mechanical Engineering, State University of Campinas (FEM/UNICAMP), São Paulo, Brazil
- Post-Graduation Program in Materials Science (PPGCM), Federal University of São Carlos (UFSCAR), Sorocaba, São Paulo, Brazil
| |
Collapse
|
7
|
Asami J, Hausen MA, Komatsu D, Ferreira LM, Silva GBG, da Silva LCSC, Baldo DA, Oliveira Junior JM, Motta AC, Duek EAR. Poly(L-co-D,L lactic acid-co-Trimethylene Carbonate) 3D printed scaffold cultivated with mesenchymal stem cells directed to bone reconstruction: In vitro and in vivo studies. J Biomater Appl 2022; 36:1550-1566. [PMID: 35130780 DOI: 10.1177/08853282211066246] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A recent and quite promising technique for bone tissue engineering is the 3D printing, peculiarly regarding the production of high-quality scaffolds. The 3D printed scaffold strictly provides suitable characteristics for living cells, in order to induce treatment, reconstruction and substitution of injured tissue. The purpose of this work was to evaluate the behavior of the 3D scaffold based on Poly(L-co-D,L lactic acid-co-Trimethylene Carbonate) (PLDLA-TMC), which was designed in Solidworks™ software, projected in 3D Slicer™, 3D printed in filament extrusion, cultured with mesenchymal stem cells (MSCs) and tested in vitro and in vivo models. For in vitro study, the MSCs were seeded in a PLDLA-TMC 3D scaffold with 600 μm pore size and submitted to proliferation and osteogenic differentiation. The in vivo assays implanted the PLDLA-TMC scaffolds with or without MSCs in the calvaria of Wistar rats submitted to 8 mm cranial bone defect, in periods of 8-12 weeks. The results showed that PLDLA-TMC 3D scaffolds favored adherence and cell growth, and suggests an osteoinductive activity, which means that the material itself augmented cellular differentiation. The implanted PLDLA-TMC containing MSCs, showed better results after 12 weeks prior grafting, due the absence of inflammatory processes, enlarged regeneration of bone tissue and facilitated angiogenesis. Notwithstanding, the 3D PLDLA-TMC itself implanted enriched tissue repair; the addition of cells known to upregulate tissue healing reinforce the perspectives for the PLDLA-TMC applications in the field of bone tissue engineering in clinical trials.
Collapse
Affiliation(s)
- Jessica Asami
- Post-Graduation Program in Biotechnology and Environmental Monitoring (PPGBMA), 67780Federal University of Sao Carlos (UFSCar), Sorocaba, SP, Brazil
| | - Moema A Hausen
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), 67828Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil
| | - Daniel Komatsu
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), 67828Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil.,Sorocaba's Technology Park Alexandre Beldi Netto, 28104Sorocaba, SP, Brazil
| | - Lucas M Ferreira
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), 67828Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil
| | - Guilherme B G Silva
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), 67828Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil
| | - Lucas C S C da Silva
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), 67828Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil
| | - Denicezar A Baldo
- Laboratory of Applied Nuclear Physics, 28104University of Sorocaba (UNISO), Sorocaba, SP, Brazil
| | - José M Oliveira Junior
- Laboratory of Applied Nuclear Physics, 28104University of Sorocaba (UNISO), Sorocaba, SP, Brazil
| | - Adriana C Motta
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), 67828Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil
| | - Eliana A R Duek
- Post-Graduation Program in Biotechnology and Environmental Monitoring (PPGBMA), 67780Federal University of Sao Carlos (UFSCar), Sorocaba, SP, Brazil.,Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), 67828Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, SP, Brazil.,Sorocaba's Technology Park Alexandre Beldi Netto, 28104Sorocaba, SP, Brazil.,Mechanical Engineering Faculty (FEM), 130242State University of Campinas (UNICAMP), Campinas, SP, Brazil
| |
Collapse
|
8
|
Soeiro VS, Tundisi LL, Novaes LC, Mazzola PG, Aranha N, Grotto D, Júnior JM, Komatsu D, Gama FM, Chaud MV, Jozala AF. Production of bacterial cellulose nanocrystals via enzymatic hydrolysis and evaluation of their coating on alginate particles formed by ionotropic gelation. Carbohydrate Polymer Technologies and Applications 2021. [DOI: 10.1016/j.carpta.2021.100155] [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: 10/20/2022] Open
|
9
|
Júnior DM, Hausen MA, Asami J, Higa AM, Leite FL, Mambrini GP, Rossi AL, Komatsu D, Duek EADR. A New Dermal Substitute Containing Polyvinyl Alcohol with Silver Nanoparticles and Collagen with Hyaluronic Acid: In Vitro and In Vivo Approaches. Antibiotics (Basel) 2021; 10:antibiotics10060742. [PMID: 34205394 PMCID: PMC8235042 DOI: 10.3390/antibiotics10060742] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/16/2021] [Accepted: 06/17/2021] [Indexed: 11/16/2022] Open
Abstract
The experimental use of poly (alcohol-vinyl) (PVA) as a skin curative is increasing widely. However, the use of this hydrogel is challenging due to its favorable properties for microbiota growth. The association with silver nanoparticles (AgNPs) as an antimicrobial agent turns the match for PVA as a dressing, as it focuses on creating a physical barrier to avoid wound dehydration. When associated with extracellular components, such as the collagen matrix, the device obtained can create the desired biological conditions to act as a skin substitute. This study aimed to analyze the anti-microbiological activity and the in vitro and in vivo responses of a bilaminar device of PVA containing AgNPs associated with a membrane of collagen-hyaluronic acid (col-HA). Additionally, mesenchymal stem cells were cultured in the device to evaluate in vitro responses and in vivo immunomodulatory and healing behavior. The device morphology revealed a porous pattern that favored water retention and in vitro cell adhesion. Controlled wounds in the dorsal back of rat skins revealed a striking skin remodeling with new epidermis fulfilling all previously injured areas after 14 and 28 days. No infections or significant inflammations were observed, despite increased angiogenesis, and no fibrosis-markers were identified as compared to controls. Although few antibacterial activities were obtained, the addition of AgNPs prevented fungal growth. All results demonstrated that the combination of the components used here as a dermal device, chosen according to previous miscellany studies of low/mid-cost biomaterials, can promote skin protection avoiding infections and dehydration, minimize the typical wound inflammatory responses, and favor the cellular healing responses, features that give rise to further clinical trials of the device here developed.
Collapse
Affiliation(s)
- Dario Mendes Júnior
- Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC/SP), São Paulo 18030-070, Brazil; (D.M.J.); (M.A.H.); (D.K.)
| | - Moema A. Hausen
- Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC/SP), São Paulo 18030-070, Brazil; (D.M.J.); (M.A.H.); (D.K.)
| | - Jéssica Asami
- Faculty of Mechanical Engineering, State University of Campinas (UNICAMP), São Paulo 13083-860, Brazil;
| | - Akemi M. Higa
- Instituto de Medicina Tropical, Universidade de São Paulo (USP), São Paulo 05403-000, Brazil;
| | - Fabio L. Leite
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos (UFSCar), São Paulo 18052-780, Brazil; (F.L.L.); (G.P.M.)
| | - Giovanni P. Mambrini
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos (UFSCar), São Paulo 18052-780, Brazil; (F.L.L.); (G.P.M.)
| | - Andre L. Rossi
- Applied Physics Department, Brazilian Center of Physics Research (CBPF), Rio de Janeiro 22290-180, Brazil;
| | - Daniel Komatsu
- Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC/SP), São Paulo 18030-070, Brazil; (D.M.J.); (M.A.H.); (D.K.)
| | - Eliana A. de Rezende Duek
- Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC/SP), São Paulo 18030-070, Brazil; (D.M.J.); (M.A.H.); (D.K.)
- Faculty of Mechanical Engineering, State University of Campinas (UNICAMP), São Paulo 13083-860, Brazil;
- Correspondence:
| |
Collapse
|
10
|
de Souza JF, da Silva Pontes K, Alves TFR, Torqueti de Barros C, Amaral VA, de Moura Crescencio KM, Rios AC, Batain F, Souto EB, Severino P, Komatsu D, de Alencar Hausen M, Chaud MV. Structural comparison, physicochemical properties, and in vitro release profile of curcumin-loaded lyotropic liquid crystalline nanoparticle: Influence of hydrotrope as interface stabilizers. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112861] [Citation(s) in RCA: 10] [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: 11/29/2022]
|
11
|
Komatsu D, Hausen MA, Eri RY, Leal V, Pedrini F, Yaksic C, Alves TFR, Chaud MV, Fanelli C, Noronha I, Duek EAR. Alternative Cutaneous Substitutes Based on Poly(l- co-d,l-lactic acid- co-trimethylene carbonate) with Schinus terebinthifolius Raddi Extract Designed for Skin Healing. ACS Omega 2019; 4:18317-18326. [PMID: 31720533 PMCID: PMC6844116 DOI: 10.1021/acsomega.9b02427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 09/25/2019] [Indexed: 06/10/2023]
Abstract
The search for new therapies and drugs that act as topical agents to relieve pain and control the inflammatory processes in burns always attracted interest in clinical trials. As an alternative to synthetic drugs, natural extracts are useful in the development of new strategies and formulations for improving the quality of life. The aim of this study was to develop a wound dressing using poly(l-co-d,l-lactic acid-co-trimethylene carbonate) (PLDLA-TMC) containing Schinus terebinthifolius Raddi (S.T.R.). S.T.R. is a native Brazilian plant known for its strong anti-inflammatory responses. The membrane of PLDLA-TMC + S. terebinthifolius Raddi was prepared at different concentrations of S.T.R. (5, 10, 15, and 50%). The Fourier transform infrared results showed no change in the PLDLA-TMC spectrum after S.T.R. addition, whereas the swelling test showed changes only in PLDLA-TMC + S.T.R. at 50%. The wettability measurements showed a mass loss due to the decrease in the contact angle in all samples after the S.T.R. addition in the polymer, whereas the S.T.R. release test showed a linear delivery pattern. The scanning electron microscopy analysis showed that S.T.R. was homogeneously distributed at only 5 and 10%. Tensile tests demonstrated an increase in Young's modulus and a reduction in the elongation till rupture of PLDLA-TMC after the addition of S.T.R. The biocompatibility in vitro evaluation with rat fibroblast cells seeded in the membranes of PLDLA-TMC + S.T.R. showed that although S.T.R. interfered in cell morphology, all concentrations tested showed that cells were able to adhere and proliferate during 7 days. Thus, S.T.R. at 50% was chosen to be tested for in vivo trials. The histological and immunohistochemistry results revealed an accelerated skin healing at 7 days after controlled secondary burns were introduced in the dorsal skin, with a striking total recovery of the epidermis and high rates of molecular activation of cell proliferation. Due to the known biocompatibility properties of PLDLA-TMC and its stable release of S.T.R., we strongly recommend S.T.R.-containing PLDLA-TMC as a curative device to favor skin healing.
Collapse
Affiliation(s)
- Daniel Komatsu
- Biomaterials Laboratory,
Medical and Health Sciences Faculty, Pontifical
University Catholic of São Paulo (PUC-SP), Sorocaba 18060-030, SP, Brazil
| | - Moema A. Hausen
- Biomaterials Laboratory,
Medical and Health Sciences Faculty, Pontifical
University Catholic of São Paulo (PUC-SP), Sorocaba 18060-030, SP, Brazil
| | - Ricardo Yugi Eri
- Biomaterials Laboratory,
Medical and Health Sciences Faculty, Pontifical
University Catholic of São Paulo (PUC-SP), Sorocaba 18060-030, SP, Brazil
| | - Vinicius Leal
- Biomaterials Laboratory,
Medical and Health Sciences Faculty, Pontifical
University Catholic of São Paulo (PUC-SP), Sorocaba 18060-030, SP, Brazil
| | - Flavia Pedrini
- Biomaterials Laboratory,
Medical and Health Sciences Faculty, Pontifical
University Catholic of São Paulo (PUC-SP), Sorocaba 18060-030, SP, Brazil
| | - Camilo Yaksic
- Facultad
de Ciencias de la Salud, Universidad Privada
del Valle, Cochabamba, Bolivia
| | - Thais F. R. Alves
- Laboratory of Biomaterials and Nanotechnology, University of Sorocaba (UNISO), Sorocaba 18023-000, SP, Brazil
| | - Marco V. Chaud
- Laboratory of Biomaterials and Nanotechnology, University of Sorocaba (UNISO), Sorocaba 18023-000, SP, Brazil
| | - Camilla Fanelli
- Medical
Faculty, University of São Paulo
(USP), São Paulo 01246-903, SP, Brazil
| | - Irene Noronha
- Medical
Faculty, University of São Paulo
(USP), São Paulo 01246-903, SP, Brazil
| | - Eliana A. R. Duek
- Biomaterials Laboratory,
Medical and Health Sciences Faculty, Pontifical
University Catholic of São Paulo (PUC-SP), Sorocaba 18060-030, SP, Brazil
| |
Collapse
|
12
|
Alves TFR, das Neves Lopes FCC, Rebelo MA, Souza JF, da Silva Pontes K, Santos C, Severino P, Junior JMO, Komatsu D, Chaud MV. Crystalline Ethylene Oxide and Propylene Oxide Triblock Copolymer Solid Dispersion Enhance Solubility, Stability and Promoting Time- Controllable Release of Curcumin. ACTA ACUST UNITED AC 2018; 12:65-74. [PMID: 29345599 DOI: 10.2174/1872211312666180118104920] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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: 09/16/2017] [Revised: 11/27/2017] [Accepted: 01/08/2018] [Indexed: 11/22/2022]
Abstract
AIMS AND BACKGROUND The design and development of an effective medicine are, however, often faced with a number of challenges. One of them is the close relationship of drug's bioavailability with solubility, dissolution rate and permeability. The use of curcumin's (CUR) therapeutic potential is limited by its poor water solubility and low chemical stability. The purpose was to evaluate the effect of polymer and solid dispersion (SD) preparation techniques to enhance the aqueous solubility, dissolution rate and stability of the CUR. The recent patents on curcumin SD were reported as (i) curcumin with polyvinylpyrrolidone (CN20071 32500 20071214, WO2006022012 and CN20151414227 20150715), (ii) curcumin-zinc/polyvinylpyrrolidone (CN20151414227 20150715), (iii) curcumin-poloxamer 188 (CN2008171177 20080605), (iv) curcumin SD prepared by melting method (CN20161626746-20160801). MATERIALS AND METHODS SD obtained by co-preciptation or microwave fusion and the physical mixture of CUR with Poloxamer-407 (P-407), Hydroxypropylmetylcellulose-K4M (HPMC K4M) and Polyvinylpyrrolidone-K30 (PVP-K30) were prepared at the ratios of 1:2; 1:1 and 2:1. The samples were evaluated by solubility, stability, dissolution rate and characterized by SEM, PXRD, DSC and FTIR. RESULTS The solubility, stability (pH 7.0) and dissolution rate were significantly greater for SD (CUR:P-407 1:2). The PXRD,SEM and DSC indicated a change in the crystalline state of CUR. The enhancement of solubility was dependent on a combination of factors including the weight ratio, preparation techniques and carrier properties. The drug release data fitted well with the Weibull equation, indicating that the drug release was controlled by diffusion, polymer relaxation and erosion occurring simultaneously. CONCLUSION Thus, these SDs, specifically CUR:P-407 1:2 w/w, can overcome the barriers of poor bioavailability to reap many beneficial properties.
Collapse
Affiliation(s)
- Thais F R Alves
- Laboratory of Biomaterials and Nanotechnology- UNISO. Sorocaba, SP, Brazil
| | | | - Marcia A Rebelo
- Laboratory of Biomaterials and Nanotechnology- UNISO. Sorocaba, SP, Brazil
| | - Juliana F Souza
- Laboratory of Biomaterials and Nanotechnology- UNISO. Sorocaba, SP, Brazil
| | | | - Carolina Santos
- Laboratory of Biomaterials and Nanotechnology- UNISO. Sorocaba, SP, Brazil
| | - Patricia Severino
- Institute of Technology and Research (ITP), University Tiradentes- UNIT. Aracaju, SE, Brazil
| | - Jose M O Junior
- Laboratory of Applicated Nuclear Physical-UNISO. Sorocaba, SP, Brazil
| | - Daniel Komatsu
- Laboratory of Biomaterials - PUC-SP. Sorocaba, SP, Brazil
| | - Marco V Chaud
- Laboratory of Biomaterials and Nanotechnology- UNISO. Sorocaba, SP, Brazil
| |
Collapse
|
13
|
Komatsu D, Mistura DV, Motta A, Domingues JA, Hausen MA, Duek E. Development of a membrane of poly (L-co-D,L lactic acid-co-trimethylene carbonate) with aloe vera: An alternative biomaterial designed to improve skin healing. J Biomater Appl 2017; 32:311-320. [DOI: 10.1177/0885328217719854] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The search for new therapies and drugs that act as topical agents to relieve pain and control the infectious processes in burns always attracted interest in clinical trials. As an alternative to synthetic drugs, the use of natural extracts is useful in the development of new strategies and formulations for improving the life quality. The aim of this study was to develop a wound dressing using Poly(L-co-D,L lactic acid-co-TMC) (PLDLA-co-TMC) containing aloe vera (AV). This natural plant extract is known for its modulatory effects under healing process. The membrane of PLDLA-co-TMC+aloe vera was prepared at different concentrations of AV (5, 10, 15 and 50%). The FTIR showed no change in the PLDLA-co-TMC spectrum after AV addition, while the swelling test showed changes only in PLDLA-co-TMC+AV at 50%. The wettability measurements showed decrease in the contact angle in all samples after the AV addition in the polymer, while the AV release test showed that PLDLA-co-TMC+50%AV sample has higher AV release rate than the sample with other AV concentrations. The SEM analysis showed that AV was homogeneously distributed at 5% only. Tensile tests demonstrated an increase in the Young's modulus and a reduction in the elongation till rupture of the PLDLA-co-TMC after the addition of AV. Biocompatibility in vitro evaluation with fibroblast cells seeded in the membranes of PLDLA-co-TMC+AV showed that the cells were able to adhere, proliferate and maintain mitochondrial activity in all AV concentrations tested. Due to the known skin medicinal properties attributed to AV and the results here obtained, we suggest that after in vivo trials, the PLDLA-co-TMC+AV should be a promising biomaterial for application as a device for skin curative and healing agent.
Collapse
Affiliation(s)
- Daniel Komatsu
- Faculdade de Ciencias Medicas e da Saude, Pontificia Universidade Catolica de Sao Paulo, São Paulo, Brazil
| | - Daniel V Mistura
- Universidade Estadual de Campinas Instituto de Biologia, São Paulo, Brazil
| | - Adriana Motta
- Faculdade de Ciencias Medicas e da Saude, Pontificia Universidade Catolica de Sao Paulo, São Paulo, Brazil
| | | | - Moema A Hausen
- Faculdade de Ciencias Medicas e da Saude, Pontificia Universidade Catolica de Sao Paulo, São Paulo, Brazil
| | - Eliana Duek
- Faculdade de Ciencias Medicas e da Saude, Pontificia Universidade Catolica de Sao Paulo, São Paulo, Brazil
| |
Collapse
|
14
|
Komatsu D, Paranhos CM, Venâncio T, Ruvolo-Filho A. Change in the Properties of Linear Low-Density Polyethylene (LLDPE)/Montmorillonite Clay Nanocomposites after a Fuel-Aging Process. Ind Eng Chem Res 2013. [DOI: 10.1021/ie303112w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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)
- Daniel Komatsu
- Department
of Chemistry and ‡Department of Materials Engineering, Federal University of São Carlos, Rodovia Washington
Luís, km 235 - SP-310, São Carlos, São Paulo,
Brazil
| | - Caio Márcio Paranhos
- Department
of Chemistry and ‡Department of Materials Engineering, Federal University of São Carlos, Rodovia Washington
Luís, km 235 - SP-310, São Carlos, São Paulo,
Brazil
| | - Tiago Venâncio
- Department
of Chemistry and ‡Department of Materials Engineering, Federal University of São Carlos, Rodovia Washington
Luís, km 235 - SP-310, São Carlos, São Paulo,
Brazil
| | - Adhemar Ruvolo-Filho
- Department
of Chemistry and ‡Department of Materials Engineering, Federal University of São Carlos, Rodovia Washington
Luís, km 235 - SP-310, São Carlos, São Paulo,
Brazil
| |
Collapse
|
15
|
Nonomura K, Komatsu D, Yoshida T, Minoura H, Schlettwein D. Dependence of the photoelectrochemical performance of sensitised ZnO on the crystalline orientation in electrodeposited ZnO thin films. Phys Chem Chem Phys 2007; 9:1843-9. [PMID: 17415497 DOI: 10.1039/b617986j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The influence of the crystal orientation in porous crystalline films of ZnO electrodeposited on the photoelectrochemical characteristics of the films is studied. For differently oriented ZnO thin films following removal of the respective structure-directing agent (SDA) and adsorption of a sensitiser, time-resolved photocurrent measurements, intensity modulated photocurrent spectroscopy (IMPS), intensity modulated photovoltage spectroscopy (IMVS) and current-voltage curves were measured in acetonitrile-based electrolytes containing I(3)(-)/I(-) as the redox electrolyte. The crystal orientation has a significant influence on the charge transport across such films and hence is reflected in the observed electrode kinetics. Films originally grown in the presence of, e.g., Coumarin 343 as a SDA, showed a significantly faster response to illumination. Increased electron diffusion coefficients and diffusion lengths were calculated from the results of IMPS and IMVS, caused by a faster electron movement in the films. Implications of these findings on further improvements of sensitised ZnO films prepared by electrochemical deposition are discussed.
Collapse
Affiliation(s)
- K Nonomura
- Institute of Applied Physics, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
| | | | | | | | | |
Collapse
|