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Ahn SY, Song YS. Enhanced Dichroism of Polarizing Composite Films by Embedding Sepiolite. ACS OMEGA 2024; 9:25793-25799. [PMID: 38911710 PMCID: PMC11191128 DOI: 10.1021/acsomega.3c10402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 05/19/2024] [Accepted: 05/28/2024] [Indexed: 06/25/2024]
Abstract
The present study investigated the use of fibrous nanoparticle-filled polarizing films. Sepiolites were selected as nanoparticles and incorporated into a PVA-iodine complex. The resulting nanocomposite film was elongated and dyed with iodine. Various properties of the nanocomposite polarizing films, including thermal, morphological, optical, and rheological features, were experimentally analyzed. The study demonstrated that an increase in sepiolite loading was accompanied by an enhancement in both the mechanical and viscoelastic properties. In particular, the incorporation of nanoparticles led to an increase in birefringence and the degree of polarization. This was attributed to the alteration of the internal structure of the PVA film caused by the embedded sepiolites. The thermal analysis showed that the composite film with a higher content of sepiolites exhibited higher crystallinity and a higher melting temperature.
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Affiliation(s)
- So Yeon Ahn
- Department of Fiber System
Engineering, Dankook University, 126 Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea
| | - Young Seok Song
- Department of Fiber System
Engineering, Dankook University, 126 Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea
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Ahmed D, Puthussery H, Basnett P, Knowles JC, Lange S, Roy I. Controlled Delivery of Pan-PAD-Inhibitor Cl-Amidine Using Poly(3-Hydroxybutyrate) Microspheres. Int J Mol Sci 2021; 22:ijms222312852. [PMID: 34884657 PMCID: PMC8658019 DOI: 10.3390/ijms222312852] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 11/23/2021] [Accepted: 11/25/2021] [Indexed: 12/13/2022] Open
Abstract
This study deals with the process of optimization and synthesis of Poly(3-hydroxybutyrate) microspheres with encapsulated Cl-amidine. Cl-amidine is an inhibitor of peptidylarginine deiminases (PADs), a group of calcium-dependent enzymes, which play critical roles in a number of pathologies, including autoimmune and neurodegenerative diseases, as well as cancer. While Cl-amidine application has been assessed in a number of in vitro and in vivo models; methods of controlled release delivery remain to be investigated. P(3HB) microspheres have proven to be an effective delivery system for several compounds applied in antimicrobial, wound healing, cancer, and cardiovascular and regenerative disease models. In the current study, P(3HB) microspheres with encapsulated Cl-amidine were produced in a size ranging from ~4–5 µm and characterized for surface morphology, porosity, hydrophobicity and protein adsorption, in comparison with empty P(3HB) microspheres. Cl-amidine encapsulation in P(3HB) microspheres was optimized, and these were found to be less hydrophobic, compared with the empty microspheres, and subsequently adsorbed a lower amount of protein on their surface. The release kinetics of Cl-amidine from the microspheres were assessed in vitro and expressed as a function of encapsulation efficiency. There was a burst release of ~50% Cl-amidine in the first 24 h and a zero order release from that point up to 16 days, at which time point ~93% of the drug had been released. As Cl-amidine has been associated with anti-cancer effects, the Cl-amidine encapsulated microspheres were assessed for the inhibition of vascular endothelial growth factor (VEGF) expression in the mammalian breast cancer cell line SK-BR-3, including in the presence of the anti-proliferative drug rapamycin. The cytotoxicity of the combinatorial effect of rapamycin with Cl-amidine encapsulated P(3HB) microspheres was found to be 3.5% more effective within a 24 h period. The cells treated with Cl-amidine encapsulated microspheres alone, were found to have 36.5% reduction in VEGF expression when compared with untreated SK-BR-3 cells. This indicates that controlled release of Cl-amidine from P(3HB) microspheres may be effective in anti-cancer treatment, including in synergy with chemotherapeutic agents. Using controlled drug-delivery of Cl-amidine encapsulated in Poly(3-hydroxybutyrate) microspheres may be a promising novel strategy for application in PAD-associated pathologies.
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Affiliation(s)
- Dina Ahmed
- Tissue Architecture and Regeneration Research Group, School of Life Sciences, University of Westminster, London W1W 6XH, UK;
| | - Hima Puthussery
- School of Life Sciences, University of Westminster, London W1W 6XH, UK; (H.P.); (P.B.)
| | - Pooja Basnett
- School of Life Sciences, University of Westminster, London W1W 6XH, UK; (H.P.); (P.B.)
| | - Jonathan C. Knowles
- Department of Biomaterials and Tissue Engineering, Eastman Dental Institute, University College London, Royal Free Hospital, Rowland Hill Street, London NW3 2PF, UK;
| | - Sigrun Lange
- Tissue Architecture and Regeneration Research Group, School of Life Sciences, University of Westminster, London W1W 6XH, UK;
- Correspondence: emails: (S.L.); (I.R.); Tel.: +44-(0)207-911-5000 (ext. 64832) (S.L.); +44-(0)114-222-5962 (ext. 64096) (I.R.)
| | - Ipsita Roy
- Department of Materials Science and Engineering, Faculty of Engineering, University of Sheffield, Sheffield S10 2TN, UK
- Correspondence: emails: (S.L.); (I.R.); Tel.: +44-(0)207-911-5000 (ext. 64832) (S.L.); +44-(0)114-222-5962 (ext. 64096) (I.R.)
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Riedel S, Schweizer T, Smith-Mannschott K, Dufresne ER, Panzarasa G. Supramolecular gelation controlled by an iodine clock. SOFT MATTER 2021; 17:1189-1193. [PMID: 33533787 DOI: 10.1039/d0sm02285c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Programming supramolecular assembly in the time domain is a fundamental aspect of the design of biomimetic materials. We achieved the time-controlled sol-gel transition of a poly(vinyl alcohol)-iodine supramolecular complex by generating iodine in situ with a clock reaction. We demonstrate that both the gelation time and the mechanical properties of the resulting hydrogel can be tuned by properly selecting the clock parameters or through competitive iodine complexation.
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Affiliation(s)
- Solenn Riedel
- Laboratory of Soft and Living Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, Zürich 8093, Switzerland.
| | - Thomas Schweizer
- Laboratory of Soft Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, Zürich 8093, Switzerland
| | - Katrina Smith-Mannschott
- Laboratory of Soft and Living Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, Zürich 8093, Switzerland.
| | - Eric R Dufresne
- Laboratory of Soft and Living Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, Zürich 8093, Switzerland.
| | - Guido Panzarasa
- Laboratory of Soft and Living Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, Zürich 8093, Switzerland. and Wood Materials Science, Institute for Building Materials, ETH Zürich, Stefano-Franscini-Platz 3, Zürich 8093, Switzerland
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The effect of counter cation species on the formation of various crystal forms and their phase transition behavior of poly(vinyl alcohol)-iodine complex. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.02.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Takahara S, Iwamura N, Ema Y, Sato Y, Mizukoshi M, Nagano T, Ichikuni N. Formation and dichroism of poly(vinyl alcohol)-iodine complex in photocurable film. POLYM ADVAN TECHNOL 2015. [DOI: 10.1002/pat.3457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shigeru Takahara
- Department of Image and Materials Science, Graduate School of Advanced Integration Science; Chiba University; 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Naoki Iwamura
- Department of Image and Materials Science, Graduate School of Advanced Integration Science; Chiba University; 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Yusuke Ema
- Department of Image and Materials Science, Graduate School of Advanced Integration Science; Chiba University; 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Yusuke Sato
- Department of Image and Materials Science, Graduate School of Advanced Integration Science; Chiba University; 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Masanori Mizukoshi
- Department of Image and Materials Science, Graduate School of Advanced Integration Science; Chiba University; 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Tomoki Nagano
- Department of Image and Materials Science, Graduate School of Advanced Integration Science; Chiba University; 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Nobuyuki Ichikuni
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering; Chiba University; 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
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Tashiro K, Kitai H, Saharin SM, Shimazu A, Itou T. Quantitative Crystal Structure Analysis of Poly(vinyl Alcohol)–Iodine Complexes on the Basis of 2D X-ray Diffraction, Raman Spectra, and Computer Simulation Techniques. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00119] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kohji Tashiro
- Department
of Future Industry-Oriented Basic Science and Materials, Toyota Technological Institute, Tempaku, Nagoya 461-8511, Japan
| | - Hideyuki Kitai
- Functional Design Technology Center, Nitto Denko Co. Ltd., Shimohozumi, Ibaraki, Osaka 567-8680, Japan
| | - Siti Munirah Saharin
- Department
of Future Industry-Oriented Basic Science and Materials, Toyota Technological Institute, Tempaku, Nagoya 461-8511, Japan
| | - Akira Shimazu
- Functional Design Technology Center, Nitto Denko Co. Ltd., Shimohozumi, Ibaraki, Osaka 567-8680, Japan
| | - Takahiko Itou
- Functional Design Technology Center, Nitto Denko Co. Ltd., Shimohozumi, Ibaraki, Osaka 567-8680, Japan
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pH-sensitive IPN hydrogel based on poly (aspartic acid) and poly (vinyl alcohol) for controlled release. Polym Bull (Berl) 2013. [DOI: 10.1007/s00289-013-0990-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Uddin AJ, Narusawa T, Gotoh Y. Enhancing mechanical properties of gel-spun polyvinyl alcohol fibers by iodine doping. POLYM ENG SCI 2010. [DOI: 10.1002/pen.21861] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Nakano Y, Matsuo M. Carbonized properties of iodine-incorporated poly(vinyl alcohol) composite films prepared by gelation/crystallization from solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:2857-2863. [PMID: 19883066 DOI: 10.1021/la900957t] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Poly(vinyl alcohol) (PVA) and titanium dioxide (TiO(2)) composite films were prepared by gelation/crystallization from a dispersed solution containing different TiO(2) contents against PVA. Iodine was incorporated into the composites, and the iodine-incorporated composites were carbonized under argon gas in the temperature range of 700-1600 degrees C. Under the carbonization process, the incorporation of iodine into composites ensured tough films without cracks. This indicated that iodine incorporation played an important role as a catalyst to promote the formation of cross links between amorphous carbon chains through the resultant Ti-C structure that occurs by hydration. Surprisingly, X-ray diffraction intensity measurements revealed that the coagulated TiO(2) powders in the composite film carbonized at 1200 degrees C remained predominantly anatase type, which has generally been known as photocatalytic activity. The perfect transition to the rutile-type structure dramatically occurred at 1600 degrees C. Judging from the carbon coating on the TiO(2) particle surface as detected by ESCA, no disruption of the composite was found to be due to the appearances of Ti(2)O(3) groups and the Ti-C structure performing cross linking between neighboring amorphous carbon chains. The characteristics of anatase-type TiO(2) crystallites and amorphous carbon structures were analyzed using the para-crystalline theory concerning the distance fluctuation between graphene sheets. The electrical conductivity of the carbonized composite was ca. 0.01 S/cm and was independent of the TiO(2) admixed in the carbon matrix.
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Affiliation(s)
- Yumiko Nakano
- Graduate School of Humanities and Sciences, Nara Women's University, Nara 630-8263, Japan
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Ohishi K, Itadani T, Hayashi T, Nakai T, Horii F. Role of boric acid in the formation of poly(vinyl alcohol)–iodine complexes in undrawn films. POLYMER 2010. [DOI: 10.1016/j.polymer.2009.01.044] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Kaneko Y, Matsuda SI, Kadokawa JI. Chemoenzymatic synthesis of amylose-grafted poly(vinyl alcohol). Polym Chem 2010. [DOI: 10.1039/b9py00215d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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