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Liparoti S, Iozzino V, Speranza V, Pantani R. Modulating poly(lactic acid) degradation rate for environmentally sustainable applications. WASTE MANAGEMENT (NEW YORK, N.Y.) 2024; 175:215-224. [PMID: 38218092 DOI: 10.1016/j.wasman.2024.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 12/16/2023] [Accepted: 01/03/2024] [Indexed: 01/15/2024]
Abstract
The huge amount of plastics generated by the massive use of packaging makes it difficult to manage waste safely. Introducing biodegradable polymers, such as poly(lactic acid) (PLA), can at least partially reduce the environmental pollution from plastic waste. Biodegradable polymers must have a degradation rate appropriate for the intended use to replace durable plastics. This work aims to introduce PLA fillers that can modulate the degradation rate during hydrolysis and composting. For this purpose, fumaric acid and magnesium hydroxide have been proposed. The experimental findings demonstrated that magnesium oxide makes hydrolysis faster than fumaric acid. A model describing the hydrolysis reaction, which also considers the effect of crystallinity, is proposed. The model can capture the filler effect on the kinetic constants related to the autocatalytic part of the hydrolysis reaction. Degradation of the PLA and compounds was also conducted in a composting medium. The compound with fumaric acid shows faster degradation than the compound with magnesium oxide; this behavior is opposite to what is observed during hydrolysis. Degradation in a composting medium is favored in a narrow pH window corresponding to the optimum environment for microorganism growth. Magnesium oxide leads to a pH increase above the optimum level, making the environment less favorable to microorganism growth. Vice-versa, fumaric acid maintains the pH level in the optimum range: it represents an additional carbon source for microorganism growth.
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Affiliation(s)
- Sara Liparoti
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132 Fisciano, SA, Italy.
| | - Valentina Iozzino
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132 Fisciano, SA, Italy
| | - Vito Speranza
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132 Fisciano, SA, Italy
| | - Roberto Pantani
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132 Fisciano, SA, Italy
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Lee S, Baek SW, Kim DS, Park SY, Kim JH, Jung JW, Lee JK, Park GM, Park CG, Han DK. Injectable Microparticle-containing hydrogel with controlled release of bioactive molecules for facial rejuvenation. Mater Today Bio 2024; 24:100890. [PMID: 38162281 PMCID: PMC10755792 DOI: 10.1016/j.mtbio.2023.100890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 11/20/2023] [Accepted: 11/28/2023] [Indexed: 01/03/2024] Open
Abstract
The skin is the largest organ and a crucial barrier for protection against various intrinsic and extrinsic factors. As we age, the skin's components become more vulnerable to damage, forming wrinkles. Among different procedures, hyaluronic acid-based hydrogel has been extensively utilized for skin regeneration and reducing wrinkles. However, it has limitations like low retention and weak mechanical properties. In this study, we suggested the poly(l-lactic acid) (PLLA) microparticles containing alkaline magnesium hydroxide and nitric oxide-generating zinc oxide and rejuvenative hyaluronic acid (HA) hydrogels including these functional microparticles and asiaticoside, creating a novel delivery system for skin rejuvenation and regeneration. The fabricated rejuvenative hydrogels have exhibited enhanced biocompatibility, pH neutralization, reactive oxygen species scavenging, collagen biosynthesis, and angiogenesis capabilities in vitro and in vivo. Additionally, an excellent volume retention ability was demonstrated due to the numerous hydrogen bonds that formed between hyaluronic acid and asiaticoside. Overall, our advanced injectable hydrogel containing functional microparticles, with controlled release of bioactive molecules, has a significant potential for enhancing the regeneration and rejuvenation of the skin.
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Affiliation(s)
- Semi Lee
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si, Gyenggi 13488, South Korea
| | - Seung-Woon Baek
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si, Gyenggi 13488, South Korea
- Department of Biomedical Engineering, SKKU Institute for Convergence, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyenggi 16419, South Korea
- Department of Intelligent Precision Healthcare Convergence, SKKU Institute for Convergence, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyenggi 16419, South Korea
| | - Da-Seul Kim
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si, Gyenggi 13488, South Korea
| | - So-Yeon Park
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si, Gyenggi 13488, South Korea
- Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, South Korea
| | - Jun Hyuk Kim
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si, Gyenggi 13488, South Korea
| | - Ji-Won Jung
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si, Gyenggi 13488, South Korea
| | - Jun-Kyu Lee
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si, Gyenggi 13488, South Korea
| | - Gi-Min Park
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si, Gyenggi 13488, South Korea
| | - Chun Gwon Park
- Department of Biomedical Engineering, SKKU Institute for Convergence, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyenggi 16419, South Korea
- Department of Intelligent Precision Healthcare Convergence, SKKU Institute for Convergence, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyenggi 16419, South Korea
| | - Dong Keun Han
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si, Gyenggi 13488, South Korea
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Lee HY, Kim DS, Hwang GY, Lee JK, Lee HL, Jung JW, Hwang SY, Baek SW, Yoon SL, Ha Y, Kim KN, Han I, Han DK, Lee CK. Multi-modulation of immune-inflammatory response using bioactive molecule-integrated PLGA composite for spinal fusion. Mater Today Bio 2023; 19:100611. [PMID: 36969699 PMCID: PMC10034518 DOI: 10.1016/j.mtbio.2023.100611] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 03/03/2023] [Accepted: 03/11/2023] [Indexed: 03/15/2023] Open
Abstract
Despite current developments in bone substitute technology for spinal fusion, there is a lack of adequate materials for bone regeneration in clinical applications. Recombinant human bone morphogenetic protein-2 (rhBMP-2) is commercially available, but a severe inflammatory response is a known side effect. Bone graft substitutes that enhance osteogenesis without adverse effects are needed. We developed a bioactive molecule-laden PLGA composite with multi-modulation for bone fusion. This bioresorbable composite scaffold was considered for bone tissue engineering. Among the main components, magnesium hydroxide (MH) aids in reduction of acute inflammation affecting disruption of new bone formation. Decellularized bone extracellular matrix (bECM) and demineralized bone matrix (DBM) composites were used for osteoconductive and osteoinductive activities. A bioactive molecule, polydeoxyribonucleotide (PDRN, PN), derived from trout was used for angiogenesis during bone regeneration. A nano-emulsion method that included Span 80 was used to fabricate bioactive PLGA-MH-bECM/DBM-PDRN (PME2/PN) composite to obtain a highly effective and safe scaffold. The synergistic effect provided by PME2/PN improved not only osteogenic and angiogenic gene expression for bone fusion but also improved immunosuppression and polarization of macrophages that were important for bone tissue repair, using a rat model of posterolateral spinal fusion (PLF). It thus had sufficient biocompatibility and bioactivity for spinal fusion.
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Affiliation(s)
- Hye Yeong Lee
- Spine & Spinal Cord Institute, Department of Neurosurgery, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
| | - Da-Seul Kim
- Department of Biomedical Science, CHA University, Gyeonggi-do, 13488, Republic of Korea
- School of Integrative Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Gwang Yong Hwang
- Spine & Spinal Cord Institute, Department of Neurosurgery, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
| | - Jun-Kyu Lee
- Department of Biomedical Science, CHA University, Gyeonggi-do, 13488, Republic of Korea
| | - Hye-Lan Lee
- Spine & Spinal Cord Institute, Department of Neurosurgery, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
| | - Ji-Won Jung
- Department of Biomedical Science, CHA University, Gyeonggi-do, 13488, Republic of Korea
| | - Sae Yeon Hwang
- Spine & Spinal Cord Institute, Department of Neurosurgery, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
- Graduate Program in Bioindustrial Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Seung-Woon Baek
- Department of Biomedical Science, CHA University, Gyeonggi-do, 13488, Republic of Korea
| | - Sol lip Yoon
- Spine & Spinal Cord Institute, Department of Neurosurgery, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
| | - Yoon Ha
- Spine & Spinal Cord Institute, Department of Neurosurgery, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
| | - Keung Nyun Kim
- Spine & Spinal Cord Institute, Department of Neurosurgery, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
| | - Inbo Han
- Department of Neurosurgery, CHA University School of Medicine, CHA Bungdang Medical Center, Gyeonggi-do, 13496, Republic of Korea
| | - Dong Keun Han
- Department of Biomedical Science, CHA University, Gyeonggi-do, 13488, Republic of Korea
- Corresponding author.
| | - Chang Kyu Lee
- Spine & Spinal Cord Institute, Department of Neurosurgery, College of Medicine, Yonsei University, Seoul, 03722, Republic of Korea
- Corresponding author.
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Baek SW, Kim DS, Song DH, Kim HB, Lee S, Kim JH, Lee JK, Hong YJ, Park CG, Han DK. Reduced restenosis and enhanced re-endothelialization of functional biodegradable vascular scaffolds by everolimus and magnesium hydroxide. Biomater Res 2022; 26:86. [PMID: 36544178 PMCID: PMC9768885 DOI: 10.1186/s40824-022-00334-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 12/05/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Coronary artery disease is a cardiovascular disease with a high mortality and mortality rate in modern society. Vascular stent insertion to restore blood flow is essential to treat this disease. A fully biodegradable vascular scaffold (BVS) is a vascular poly (L-lactic acid) (PLLA) stent that is receiving growing interest as this is biodegradable in the body and does not require secondary removal surgery. However, acidic byproducts composed of PLLA produced during the biodegradation of the BVS can induce an inflammatory response. Magnesium hydroxide, a basic inorganic particle, neutralizes the acidic byproducts of PLLA. METHODS: In this study, we investigated using a BVS coated with everolimus and surface-modified magnesium hydroxide that suppresses smooth muscle cell proliferation and protects endothelial cells, respectively. The various characteristics of the functional stent were evaluated using in vitro and in vivo analyses. RESULTS: The BVS was successfully prepared with evenly coated everolimus and surface-modified magnesium hydroxide. A neutral pH value was maintained by magnesium hydroxide during degradation, and everolimus was released for one month. The coated BVS effectively inhibited protein adsorption and platelet adhesion, demonstrating excellent blood compatibility. In vitro analysis showed that BVS protects endothelial cells with magnesium hydroxide and selectively inhibits smooth muscle cell proliferation via everolimus treatment. The functional BVS was inserted into porcine coronary arteries for 28 days, and the results demonstrated that the restenosis and inflammation greatly decreased and re-endothelialization was enhanced as compared to others. CONCLUSIONS This study provides new insights into the design of drug-incorporated BVS stent for coronary artery disease.
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Affiliation(s)
- Seung-Woon Baek
- grid.410886.30000 0004 0647 3511Department of Biomedical Science, CHA University, 335 Pangyo-Ro, Bundang-Gu, Seongnam-Si, Gyeonggi 13488 Korea ,grid.264381.a0000 0001 2181 989XDepartment of Biomedical Engineering, SKKU Institute for Convergence, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi 16419 Korea ,grid.264381.a0000 0001 2181 989XDepartment of Intelligent Precision Healthcare Convergence, SKKU Institute for Convergence, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi 16419 Korea
| | - Da-Seul Kim
- grid.410886.30000 0004 0647 3511Department of Biomedical Science, CHA University, 335 Pangyo-Ro, Bundang-Gu, Seongnam-Si, Gyeonggi 13488 Korea ,grid.254224.70000 0001 0789 9563School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974 Korea
| | - Duck Hyun Song
- grid.410886.30000 0004 0647 3511Department of Biomedical Science, CHA University, 335 Pangyo-Ro, Bundang-Gu, Seongnam-Si, Gyeonggi 13488 Korea
| | - Han Byul Kim
- grid.412484.f0000 0001 0302 820XThe Cardiovascular Convergence Research Center of Chonnam, National University Hospital Designated By Korea Ministry of Health and Welfare, 42 Jebong-ro, Dong-gu, Gwangju, 61469 Korea
| | - Semi Lee
- grid.410886.30000 0004 0647 3511Department of Biomedical Science, CHA University, 335 Pangyo-Ro, Bundang-Gu, Seongnam-Si, Gyeonggi 13488 Korea
| | - Jun Hyuk Kim
- grid.410886.30000 0004 0647 3511Department of Biomedical Science, CHA University, 335 Pangyo-Ro, Bundang-Gu, Seongnam-Si, Gyeonggi 13488 Korea
| | - Jun-Kyu Lee
- grid.410886.30000 0004 0647 3511Department of Biomedical Science, CHA University, 335 Pangyo-Ro, Bundang-Gu, Seongnam-Si, Gyeonggi 13488 Korea
| | - Young Joon Hong
- grid.412484.f0000 0001 0302 820XDivision of Cardiology of Chonnam, Cardiovascular Convergence Research Center Nominated By Korea Ministry of Health and Welfare, National University Hospital, 42 Jebong-ro, Dong-gu, Gwangju, 61469 Korea
| | - Chun Gwon Park
- grid.264381.a0000 0001 2181 989XDepartment of Biomedical Engineering, SKKU Institute for Convergence, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi 16419 Korea ,grid.264381.a0000 0001 2181 989XDepartment of Intelligent Precision Healthcare Convergence, SKKU Institute for Convergence, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi 16419 Korea
| | - Dong Keun Han
- grid.410886.30000 0004 0647 3511Department of Biomedical Science, CHA University, 335 Pangyo-Ro, Bundang-Gu, Seongnam-Si, Gyeonggi 13488 Korea
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Baek SW, Kim DS, Song DH, Lee S, Lee JK, Park SY, Kim JH, Kim TH, Park CG, Han DK. PLLA Composites Combined with Delivery System of Bioactive Agents for Anti-Inflammation and Re-Endothelialization. Pharmaceutics 2022; 14:pharmaceutics14122661. [PMID: 36559156 PMCID: PMC9782680 DOI: 10.3390/pharmaceutics14122661] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 11/24/2022] [Accepted: 11/25/2022] [Indexed: 12/02/2022] Open
Abstract
The development of a biodegradable vascular scaffold (BVS) for the treatment of cardiovascular diseases (CVDs) still requires some improvement. Among them, re-endothelialization and anti-inflammation are clinically important to restore vascular function. In this study, we proposed a coating system to deliver hydrophilic bioactive agents to BVS using nanoemulsion and drop-casting methods. The poly(L-lactide) (PLLA) scaffold containing magnesium hydroxide (MH) was coated on the surface with bioactive molecules such as polydeoxyribonucleotide (PDRN), L-arginine (Arg, R), and mesenchymal stem cell-derived extracellular vesicles (EVs). PDRN upregulates the expression of VEGF as one of the A2A receptor agonists; and Arg, synthesized into nitric oxide by intracellular eNOS, induces endothelialization. In particular, EVs, which are composed of a lipid bilayer and transfer bioactive materials such as protein and nucleic acid, regulate homeostasis in blood vessels. Such a bioactive agent coating system and its PLLA composite suggest a new platform for the treatment of cardiovascular dysfunction.
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Affiliation(s)
- Seung-Woon Baek
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si 13488, Republic of Korea
- Department of Biomedical Engineering, SKKU Institute for Convergence, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon-si 16419, Republic of Korea
- Department of Intelligent Precision Healthcare Convergence, SKKU Institute for Convergence, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon-si 16419, Republic of Korea
| | - Da-Seul Kim
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si 13488, Republic of Korea
- School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Duck Hyun Song
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si 13488, Republic of Korea
| | - Semi Lee
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si 13488, Republic of Korea
| | - Jun-Kyu Lee
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si 13488, Republic of Korea
| | - So-Yeon Park
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si 13488, Republic of Korea
- Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Jun Hyuk Kim
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si 13488, Republic of Korea
| | - Tae-Hyung Kim
- School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Chun Gwon Park
- Department of Biomedical Engineering, SKKU Institute for Convergence, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon-si 16419, Republic of Korea
- Department of Intelligent Precision Healthcare Convergence, SKKU Institute for Convergence, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon-si 16419, Republic of Korea
| | - Dong Keun Han
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam-si 13488, Republic of Korea
- Correspondence:
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Li Q, Liu H, Nie C, Xie G, Che Z, Zhu D, Guo L, Xiang Y, Shi W. PMMA-Grafted Calcium Sulfate Whiskers for Applications as Fillers in PVC. Polymers (Basel) 2022; 14:polym14194199. [PMID: 36236147 PMCID: PMC9572563 DOI: 10.3390/polym14194199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 10/02/2022] [Accepted: 10/04/2022] [Indexed: 11/16/2022] Open
Abstract
Calcium sulfate whiskers (CSWs) were hydroxylated with a sodium hydroxide (NaOH) solution and isolated for subsequent treatment with an ethanolic 3-(methacryloxy)propyltrimethoxysilane (KH570) solution to introduce C=C double bonds on the CSWs' surfaces. Then, CSW-g-PMMA was prepared by grafting polymethyl methacrylate (PMMA) onto the surface of modified CSW using in situ dispersion polymerization. The CSW-g-PMMA was used as a filler and melt-blended with polyvinyl chloride (PVC) to prepare PVC-based composites. The surface chemical structure, PMMA grafting rate, and hydrophobic properties of CSW-g-PMMA were analyzed using X-ray diffraction, diffuse reflectance Fourier-transform infrared spectroscopy, thermogravimetric analysis, and water contact angle measurements, respectively. The effects of the CSW-g-PMMA filler on the mechanical properties of the CSW-PMMA/PVC composites were also investigated. The results showed that NaOH treatment significantly increased the number of hydroxyl groups on the surface of the CSWs, which facilitated the introduction of KH570. PMMA was successfully grafted onto the KH570 with a grafting rate of 14.48% onto the surface of the CSWs. The CSW-g-PMMA had good interfacial compatibility and adhesion properties with the PVC matrix. The tensile, flexural, and impact strengths of the CSW-g-PMMA/PVC composite reached 39.28 MPa, 45.69 MPa, and 7.05 kJ/m2, respectively, which were 38.55%, 30.99%, and 20.10% higher than those of the CSW/PVC composite and 54.52%, 40.80%, and 32.52% higher than those of pure PVC, respectively. This work provides a new method for surface modification of inorganic fillers, resource utilization, and high value-added application of CSWs from phosphogypsum.
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Affiliation(s)
- Qingbiao Li
- School of Materials and Chemical Engineering, Tongren University, Tongren 554300, China
| | - Hao Liu
- School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
| | - Chenchen Nie
- School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
| | - Guiming Xie
- School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
- Key Laboratory of Guizhou Province for Green Chemical Industry and Clean Energy Technology, Guizhou University, Guiyang 550025, China
- Correspondence: (G.X.); (L.G.)
| | - Zhaomei Che
- School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
| | - Dehui Zhu
- School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
| | - Lei Guo
- School of Materials and Chemical Engineering, Tongren University, Tongren 554300, China
- Correspondence: (G.X.); (L.G.)
| | - Yuan Xiang
- School of Materials and Chemical Engineering, Tongren University, Tongren 554300, China
| | - Wei Shi
- School of Materials and Chemical Engineering, Tongren University, Tongren 554300, China
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Enhanced Mechanical Properties and Anti-Inflammation of Poly(L-Lactic Acid) by Stereocomplexes of PLLA/PDLA and Surface-Modified Magnesium Hydroxide Nanoparticles. Polymers (Basel) 2022; 14:polym14183790. [PMID: 36145934 PMCID: PMC9504497 DOI: 10.3390/polym14183790] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/01/2022] [Accepted: 09/07/2022] [Indexed: 12/29/2022] Open
Abstract
Poly(L-lactic acid) (PLLA), as a biodegradable polymer, has attracted attention for use as a biomaterial. In order to apply PLLA as a cardiovascular stent, stronger mechanical properties and anti-inflammatory effects against acidic by-products are required. In this study, PLLA/PDLA stereocomplex microparticles (SC) were developed and surface-modified magnesium hydroxide (MH) nanoparticles with oligolactide were combined with these PLLA composites. The SC improved the mechanical properties of the PLLA composites through the formation of stereocomplex structures. The surface-modified MH nanoparticles showed enhanced mechanical properties due to the stereocomplex structures formed by PLLA chains and inhibited inflammatory responses by pH neutralization as a result of MH. Additionally, the MH nanoparticles containing PLLA composites had antibacterial effects and increased the viability of human vascular endothelial cells. This technology is expected to have great potential in the development of PLLA composite materials for the production of various medical devices, such as cardiovascular stents.
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Kim DH, Kim DS, Ha HJ, Jung JW, Baek SW, Baek SH, Kim TH, Lee JC, Hwang E, Han DK. Fat Graft with Allograft Adipose Matrix and Magnesium Hydroxide-Incorporated PLGA Microspheres for Effective Soft Tissue Reconstruction. Tissue Eng Regen Med 2022; 19:553-563. [PMID: 35312988 PMCID: PMC9130390 DOI: 10.1007/s13770-021-00426-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/16/2021] [Accepted: 12/20/2021] [Indexed: 10/18/2022] Open
Abstract
BACKGROUND Autologous fat grafting is one of the most common procedures used in plastic surgery to correct soft tissue deficiency or depression deformity. However, its clinical outcomes are often suboptimal, and lack of metabolic and architectural support at recipient sites affect fat survival leading to complications such as cyst formation, calcification. Extracellular matrix-based scaffolds, such as allograft adipose matrix (AAM) and poly(lactic-co-glycolic) acid (PLGA), have shown exceptional clinical promise as regenerative scaffolds. Magnesium hydroxide (MH), an alkaline ceramic, has attracted attention as a potential additive to improve biocompatibility. We attempted to combine fat graft with regenerative scaffolds and analyzed the changes and viability of injected fat graft in relation to the effects of injectable natural, and synthetic (PLGA/MH microsphere) biomaterials. METHODS In vitro cell cytotoxicity, angiogenesis of the scaffolds, and wound healing were evaluated using human dermal fibroblast cells. Subcutaneous soft-tissue integration of harvested fat tissue was investigated in vivo in nude mouse with random fat transfer protocol Fat integrity and angiogenesis were identified by qRT-PCR and immunohistochemistry. RESULTS In vitro cell cytotoxicity was not observed both in AAM and PLGA/MH with human dermal fibroblast. PLGA/MH and AAM showed excellent wound healing effect. In vivo, the AAM and PLGA/MH retained volume compared to that in the only fat group. And the PLGA/MH showed the highest angiogenesis and anti-inflammation. CONCLUSION In this study, a comparison of the volume retention effect and angiogenic ability between autologous fat grafting, injectable natural, and synthetic biomaterials will provide a reasonable basis for fat grafting.
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Affiliation(s)
- Dae-Hee Kim
- Department of Biomedical Engineering, College of Medicine, Seoul National University, 103 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Da-Seul Kim
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam, 13488, Republic of Korea
- School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Hyun-Jeong Ha
- Department of Plastic and Reconstructive Surgery, CHA Bundang Medical Center, CHA University School of Medicine, 59 Yatap-ro, Bundang-gu, Seongnam, 13496, Republic of Korea
| | - Ji-Won Jung
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam, 13488, Republic of Korea
| | - Seung-Woon Baek
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam, 13488, Republic of Korea
| | - Seung Hwa Baek
- CHA Advanced Research Institute Center for Research & Development, Histological Analysis Team, 335 Pangyo-ro, Bundang-gu, Seongnam, 13488, Republic of Korea
| | - Tae-Hyung Kim
- School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Jung Chan Lee
- Department of Biomedical Engineering, College of Medicine, Seoul National University, 103 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea.
| | - Euna Hwang
- Department of Plastic and Reconstructive Surgery, CHA Gangnam Medical Center, 566 Nonhyun-ro, Gangnam-gu, Seoul, 06135, Republic of Korea.
| | - Dong Keun Han
- Department of Biomedical Science, CHA University, 335 Pangyo-ro, Bundang-gu, Seongnam, 13488, Republic of Korea.
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