期刊
BIOMACROMOLECULES
卷 13, 期 4, 页码 1122-1128出版社
AMER CHEMICAL SOC
DOI: 10.1021/bm300006r
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资金
- Turkish Academy of Sciences (TUBA)
Silk fibroin hydrogels with tunable properties could be obtained from aqueous fibroin solutions (4.2 w/v %) in a short period of time. This was achieved by the addition of ethylene glycol diglycidyl ether (EGDE) into the reaction solution. Introduction of EGDE cross-links between the fibroin molecules decreases the mobility of the chains, which triggers the conformational transition from random-coil to beta-sheet structure and hence fibroin gelation. Dynamic rheological measurements conducted at 50 degrees C show the formation of strong to weak hydrogels depending on the pH of the reaction solution. Although EGDE attacks the amino groups of fibroin and forms interstrand cross-links, beta-sheets acting as physical cross-links dominate the elasticity of the hydrogels. Mechanical response of low-modulus fibroin hydrogels formed above pH 9.7 is highly nonlinear with strong strain hardening behavior (700%) arising from the alignment of the crystallizable amino acid segments.
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