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KMID : 0380020090240060563
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Korean Journal of Biotechnology and Bioengineering
2009 Volume.24 No. 6 p.563 ~ p.569
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Preparation of Semi-solid Fibroin Gel and its Flow Property
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Hur Won
Lee Shin-Young
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Abstract
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subsequent dialysis. The aqueous solution is unstable and a transition from aqueous fibroin molecules rich in random coil is undergo to one rich in β-sheet content, resulting in hydrogelation. However, fibroin gel is so fragile and plastic that its mechanical property should be reformed for various applications. In this report, a semi-solid form of fibroin gel was prepared using glycerol and ethanol and was investigated to analyze their flow properties. A fibroin gel with 80% glycerol showed pseudoplastic and thixotropic properties. The square root of its yield stress varied linearly with fibroin concentration and it extrapolated to zero shear stress at 0.2% fibroin. A fibroin gel with 40% ethanol was shown to be highly thixotropic but its shear-thinning behavior was only observed above a certain level of shear rate. Its pseudoplasticity was restored by a high rate of shear stress.
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KEYWORD
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fibroin, fibroin gel, flow property, semi-solid gel
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