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Júnior AF, Ribeiro CA, Leyva ME, Marques PS, Soares CRJ, Alencar de Queiroz AA. Biophysical properties of electrospun chitosan-grafted poly(lactic acid) nanofibrous scaffolds loaded with chondroitin sulfate and silver nanoparticles. J Biomater Appl 2021; 36:1098-1110. [PMID: 34601887 DOI: 10.1177/08853282211046418] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 11/16/2022]
Abstract
The aim of this work was to study the biophysical properties of the chitosan-grafted poly(lactic acid) (CH-g-PLA) nanofibers loaded with silver nanoparticles (AgNPs) and chondroitin-4-sulfate (C4S). The electrospun CH-g-PLA:AgNP:C4S nanofibers were manufactured using the electrospinning technique. The microstructure of the CH-g-PLA:AgNP:C4S nanofibers was investigated by proton nuclear magnetic resonance (1H-NMR), scanning electron microscopy (SEM), UV-Visible spectroscopy (UV-Vis), X-ray diffraction (XRD), and Fourier transform infrared (ATR-FTIR) spectroscopy. ATR-FTIR and 1H-NMR confirm the CH grafting successfully by PLA with a substitution degree of 33.4%. The SEM measurement results indicated apparently smooth nanofibers having a diameter range of 340 ± 18 nm with porosity of 89 ± 3.08% and an average pore area of 0.27 μm2. UV-Vis and XRD suggest that silver nanoparticles with the size distribution of 30 nm were successfully incorporated into the electrospun nanofibers. The water contact angle of 12.8 ± 2.7° reveals the hydrophilic nature of the CH-g-PLA:AgNP:C4S nanofibers has been improved by C4S. The electrospun CH-g-PLA:AgNP:C4S nanofibers are found to release ions Ag+ at a concentration level capable of rendering an antimicrobial efficacy. Gram-positive bacteria (S.aureus) were more sensitive to CH-g-PLA:AgNP:C4S than Gram-negative bacteria (E. coli). The electrospun CH-g-PLA:AgNP:C4S nanofibers exhibited no cytotoxicity to the L-929 fibroblast cells, suggesting cytocompatibility. Fluorescence microscopy demonstrated that C4S promotes the adhesion and proliferation of fibroblast cells onto electrospun CH-g-PLA:AgNP:C4S nanofibers.
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Affiliation(s)
- Alexandre F Júnior
- Doctorate Post-graduate scholarship in Materials for Engineering/Biomaterials (CAPES), 28094Federal University of Itajubá (UNIFEI), Itajubá, Brazil
| | - Charlene A Ribeiro
- Doctorate Post-graduate scholarship in Materials for Engineering/Biomaterials (CAPES), 28094Federal University of Itajubá (UNIFEI), Itajubá, Brazil
| | - Maria E Leyva
- 28094Institute of Physics and Chemistry/Federal University of Itajubá (UNIFEI), Itajubá, Brazil
| | - Paulo S Marques
- 28094Institute of Natural Resources (IRN)/Federal University of Itajubá (UNIFEI), Itajubá, Brazil
| | - Carlos R J Soares
- Biotechnology Center (CEBIO), 119500Nuclear and Energy Research Institute, Sao Paulo, Brazil
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Moreno-Vásquez MJ, Plascencia-Jatomea M, Sánchez-Valdes S, Tanori-Córdova JC, Castillo-Yañez FJ, Quintero-Reyes IE, Graciano-Verdugo AZ. Characterization of Epigallocatechin-Gallate- Grafted Chitosan Nanoparticles and Evaluation of Their Antibacterial and Antioxidant Potential. Polymers (Basel) 2021; 13:1375. [PMID: 33922410 PMCID: PMC8122830 DOI: 10.3390/polym13091375] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 03/22/2021] [Revised: 04/16/2021] [Accepted: 04/19/2021] [Indexed: 01/28/2023] Open
Abstract
Nanoparticles based on chitosan modified with epigallocatechin gallate (EGCG) were synthetized by nanoprecipitation (EGCG-g-chitosan-P). Chitosan was modified by free-radical-induced grafting, which was verified by Fourier transform infrared (FTIR). Furthermore, the morphology, particle size, polydispersity index, and zeta potential of the nanoparticles were investigated. The grafting degree of EGCG, reactive oxygen species (ROS) production, antibacterial and antioxidant activities of EGCG-g-chitosan-P were evaluated and compared with those of pure EGCG and chitosan nanoparticles (Chitosan-P). FTIR results confirmed the modification of the chitosan with EGCG. The EGCG-g-chitosan-P showed spherical shapes and smoother surfaces than those of Chitosan-P. EGCG content of the grafted chitosan nanoparticles was 330 μg/g. Minimal inhibitory concentration (MIC) of EGCG-g-chitosan-P (15.6 μg/mL) was lower than Chitosan-P (31.2 μg/mL) and EGCG (500 μg/mL) against Pseudomonas fluorescens (p < 0.05). Additionally, EGCG-g-chitosan-P and Chitosan-P presented higher Staphylococcus aureus growth inhibition (100%) than EGCG at the lowest concentration tested. The nanoparticles produced an increase of ROS (p < 0.05) in both bacterial species assayed. Furthermore, EGCG-g-chitosan-P exhibited higher antioxidant activity than that of Chitosan-P (p < 0.05) in 2,2'-azino-bis (3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS), 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) and ferric-reducing antioxidant power assays. Based on the above results, EGCG-g-chitosan-P shows the potential for food packaging and biomedical applications.
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Affiliation(s)
- María J. Moreno-Vásquez
- Departamento de Ciencias Químico Biológicas, Universidad de Sonora, 83000 Hermosillo, Sonora, Mexico; (M.J.M.-V.); (F.J.C.-Y.)
- Departamento de Investigación y Posgrado en Alimentos, Universidad de Sonora, 83000 Hermosillo, Sonora, Mexico
| | - Maribel Plascencia-Jatomea
- Departamento de Investigación y Posgrado en Alimentos, Universidad de Sonora, 83000 Hermosillo, Sonora, Mexico
| | - Saúl Sánchez-Valdes
- Departamento de Procesos de Transformación de Plásticos, Centro de Investigación en Química Aplicada, 25294 Saltillo, Coahuila, Mexico;
| | - Judith C. Tanori-Córdova
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, 83000 Hermosillo, Sonora, Mexico;
| | - Francisco J. Castillo-Yañez
- Departamento de Ciencias Químico Biológicas, Universidad de Sonora, 83000 Hermosillo, Sonora, Mexico; (M.J.M.-V.); (F.J.C.-Y.)
| | | | - Abril Z. Graciano-Verdugo
- Departamento de Ciencias Químico Biológicas, Universidad de Sonora, 83000 Hermosillo, Sonora, Mexico; (M.J.M.-V.); (F.J.C.-Y.)
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Mei L, Ren Y, Gu Y, Li X, Wang C, Du Y, Fan R, Gao X, Chen H, Tong A, Zhou L, Guo G. Strengthened and Thermally Resistant Poly(lactic acid)-Based Composite Nanofibers Prepared via Easy Stereocomplexation with Antibacterial Effects. ACS Appl Mater Interfaces 2018; 10:42992-43002. [PMID: 30456954 DOI: 10.1021/acsami.8b14841] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Strengthened poly(lactic acid) (PLA)-based materials with improved mechanical performance and improved thermal resistance, notably, are prepared by introducing stereocomplex crystallite (SC), an ideal filler, into the materials. Owing to the intermolecular hydrogen bond among the stereoisomer chains, the melting point of the special crystallite is up to 200 °C, which is 50 °C higher than the isostatic crystallite. The modulus of the PLA-based materials can be enhanced to several 100 MPa because of the integrated polymer chain arrangement. In this study, we electrospun hybrid nanofibers consisted of PLA stereoisomers and induced the stereocomplex crystallization under a mild condition (65 °C for 1 h). The mild warming is favorable for the protection of chlorogenic acid (CA) that was selected as the antibacterial agent. Both of Gram-positive and Gram-negative bacteria were efficiently cleared away using the warmed nanofibers that released CA rapidly within just a few hours. Used as filters, the SC electrospinning membrane also presented a potent filtering effect, leaving no bacteria retained in the filtrates. Attributing to SC, the PLA-based nanofibers showed extremely increased melting temperature over 200 °C and improved Young's modulus up to 270.0 MPa. The durable nanofibers prepared in present study are meaningful for enlarging the application of PLA-based materials, for example, as filters, masks, and packages.
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Affiliation(s)
- Lan Mei
- State Key Laboratory of Biotherapy and Cancer Center, and Department of Neurosurgery, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu , 610041 , P. R. China
| | - Yangmei Ren
- State Key Laboratory of Biotherapy and Cancer Center, and Department of Neurosurgery, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu , 610041 , P. R. China
| | - Yingchun Gu
- College of Light Industry, Textile and Food Engineering , Sichuan University , Chengdu 610065 , P. R. China
| | - Xiaoling Li
- State Key Laboratory of Biotherapy and Cancer Center, and Department of Neurosurgery, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu , 610041 , P. R. China
| | - Chao Wang
- National Engineering Research Center for Synthesis of novel Rubber and Plastic Materials, Yanshan Branch, Beijing Research Institute of Chemical Industry, SINOPEC, Beijing , 102500 , P. R. China
| | - Ying Du
- National Engineering Research Center for Synthesis of novel Rubber and Plastic Materials, Yanshan Branch, Beijing Research Institute of Chemical Industry, SINOPEC, Beijing , 102500 , P. R. China
| | - Rangrang Fan
- State Key Laboratory of Biotherapy and Cancer Center, and Department of Neurosurgery, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu , 610041 , P. R. China
| | - Xiang Gao
- State Key Laboratory of Biotherapy and Cancer Center, and Department of Neurosurgery, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu , 610041 , P. R. China
| | - Haifeng Chen
- State Key Laboratory of Biotherapy and Cancer Center, and Department of Neurosurgery, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu , 610041 , P. R. China
| | - Aiping Tong
- State Key Laboratory of Biotherapy and Cancer Center, and Department of Neurosurgery, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu , 610041 , P. R. China
| | - Liangxue Zhou
- State Key Laboratory of Biotherapy and Cancer Center, and Department of Neurosurgery, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu , 610041 , P. R. China
| | - Gang Guo
- State Key Laboratory of Biotherapy and Cancer Center, and Department of Neurosurgery, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy , Chengdu , 610041 , P. R. China
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Xu C, Cao L, Zhao P, Zhou Z, Cao C, Zhu F, Li F, Huang Q. Synthesis and Characterization of Stimuli-Responsive Poly(2-dimethylamino-ethylmethacrylate)- Grafted Chitosan Microcapsule for Controlled Pyraclostrobin Release. Int J Mol Sci 2018; 19:E854. [PMID: 29538323 DOI: 10.3390/ijms19030854] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Controllable pesticide release in response to environmental stimuli is highly desirable for better efficacy and fewer adverse effects. Combining the merits of natural and synthetic polymers, pH and temperature dual-responsive chitosan copolymer (CS-g-PDMAEMA) was facilely prepared through free radical graft copolymerization with 2-(dimethylamino) ethyl 2-methacrylate (DMAEMA) as the vinyl monomer. An emulsion chemical cross-linking method was used to expediently fabricate pyraclostrobin microcapsules in situ entrapping the pesticide. The loading content and encapsulation efficiency were 18.79% and 64.51%, respectively. The pyraclostrobin-loaded microcapsules showed pH-and thermo responsive release. Microcapsulation can address the inherent limitation of pyraclostrobin that is photo unstable and highly toxic on aquatic organisms. Compared to free pyraclostrobin, microcapsulation could dramatically improve its photostability under ultraviolet light irradiation. Lower acute toxicity against zebra fish on the first day and gradually similar toxicity over time with that of pyraclostrobin technical concentrate were in accordance with the release profiles of pyraclostrobin microcapsules. This stimuli-responsive pesticide delivery system may find promising application potential in sustainable plant protection.
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