| Microstructures and rheological properties of tilapia fish-scale collagen hydrogels with aligned fibrils fabricated under magnetic fields. | |
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MedLine Citation:
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PMID: 20851220 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Tilapia fish-scale type I atelocollagen hydrogels with aligned fibril structures were fabricated under a strong magnetic field of 6 or 12 T using two different methods. In the first method, a solution of acid-soluble collagen was neutralized with phosphate buffer saline and maintained in the magnetic field at 28°C for 3h. Under these conditions fibrogenesis occurs, and a hydrogel is formed. The hydrogel was subsequently crosslinked with ethyl-dimethylcarbodiimide (EDC). In the second method, the hydrogels were formed as described above, but in the absence of an applied magnetic field. Only after being crosslinked with EDC were these gels exposed to the magnetic field (28°C for 3h). Both methods led to alignment of the collagen fibrils perpendicular to the magnetic direction, the extent of which depended on the duration of magnetic treatment. Even after EDC treatment, collagen fibrils can align, indicating that crosslinking has taken place within fibrils. Both sorts of aligned hydrogels exhibited similar rheological properties with higher storage and loss moduli than were observed with unoriented gels. The hydrogels treated at 6 T had the best rheological properties. The decrease in tangent angle phase delta indicated that the ratio of elasticity to viscosity was greater in the crosslinked than in the non-crosslinked hydrogels. Atomic force microscopy images showed that magnetic treatment had no effect on the nanostructure of collagen fibrils. Differential scanning calorimetry measurements indicated that collagen hydrogels with and without magnetic treatment had the same denaturation temperature, 48°C, while EDC crosslinking increased the denaturation temperature to 62°C. |
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Authors:
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S Chen; N Hirota; M Okuda; M Takeguchi; H Kobayashi; N Hanagata; T Ikoma |
Publication Detail:
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Type: Journal Article Date: 2010-09-17 |
Journal Detail:
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Title: Acta biomaterialia Volume: 7 ISSN: 1878-7568 ISO Abbreviation: Acta Biomater Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-03 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101233144 Medline TA: Acta Biomater Country: England |
Other Details:
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Languages: eng Pagination: 644-52 Citation Subset: IM |
Copyright Information:
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Copyright © 2010. Published by Elsevier Ltd. |
Affiliation:
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Biomaterials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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