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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of low molecular weight silk fibroin by high-temperature and high-pressure method
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Preparation and characterization of low molecular weight silk fibroin by high-temperature and high-pressure method

机译：高温高压法制备低分子量丝素蛋白及其表征

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A low molecular weight silk fibroin powder (LMSF) was prepared through high temperature (200degreesC) and high pressure (20 kgf/cm(2)), without any addition of chemicals. The carbonized adducts produced during this process were then removed by treatment with activated charcoal. The yield of LMSF by this preparation method was over 60% after the removal of carbonized adducts by using activated charcoal. Amino acid analysis showed an observable decrease in contents of serine and tyrosine in LMSF prepared by this method, as compared to those prepared by neutral salt, The molecular weight of this LMSF was also observably decreased with an increase in the reaction time. From the measurements of differential scanning calorimeter (DSC) and thermal gravimetric analyzer (TGA), thermal properties of LMSF through high temperature and high pressure were also decreased as compared to those produced by neutral salts. In addition, wide-angle X-ray diffraction (WAXD) patterns showed that the crystallinity of LMSF differed from that of the original silk fibroin. It can be said that the preparation method of LNSF in this study is a simple, economical, and environmentally compatible process with many advantages. (C) 2002 Wiley Periodicals, Inc. [References: 21]
机译：通过高温（200℃）和高压（20 kgf / cm（2））制备低分子量丝素蛋白粉（LMSF），无需添加任何化学物质。然后通过用活性炭处理除去在此过程中产生的碳化加合物。通过使用活性炭除去碳化的加合物后，通过该制备方法的LMSF的产率超过60％。氨基酸分析显示，与用中性盐制备的LMSF相比，用该方法制备的LMSF中的丝氨酸和酪氨酸含量明显降低，并且该LMSF的分子量也随着反应时间的增加而降低。从差示扫描量热仪（DSC）和热重分析仪（TGA）的测量来看，与中性盐相比，LMSF在高温和高压下的热性能也降低了。此外，广角X射线衍射（WAXD）图表明LMSF的结晶度不同于原始的丝素蛋白。可以说本研究中LNSF的制备方法是一种简单，经济，环保的方法，具有许多优点。 （C）2002 Wiley Periodicals，Inc. [参考：21]

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