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首页> 外文会议>Takasaki Symposium on Radiation Processing of Natural Polymers November 23 and 24, 2000, JAERI, Takasaki, Japan >18 Radiation Degradation of Silk
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18 Radiation Degradation of Silk

机译：18丝绸的辐射降解

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摘要

Silk fibroin power was prepared from irradiated silk fibroin fiber by means of only physical treatment. Silk fibroin fiber irradiated with an accelerated electron beam in the dose range of 250 - 1000 kGy was pulverized by using a ball mill. Unirradiated silk fibrion fiber was not pulverized at all. But the more irradiation was increased, the more the conversion efficiency from fiber to powder was increased. The conversion efficiency of silk fibroin fiber irradiated 1000 kGy in oxygen was 94 percent. Silk fibroin powder shows remarkable solubility, which dissolved 57 percent into water of ambient temperature. It is a very interesting phenomenon that silk fibroin which did not treat with chemicals gets solubility only being pulverized. In order to study mechanism of solubilization of silk fibroin powder, amino acid component of soluble part of silk fibroin powder was analyzed. The more irradiation dose up, the more glycine or alanine degraded, but degradation fraction reached bounds about 50 percent. Other amino acids were degraded only 20 percent even at the maximum. To consider crystal construction of silk fibroin, it is suggested that irradiation on silk fibroin fiber selectively degrades glycine and alanine in amorphous region, which makes it possible to pulverize and to dissolve silk fibroin powder.
机译：丝素蛋白粉仅通过物理处理由辐照的丝素蛋白纤维制备。通过使用球磨机将用250-1000kGy剂量范围的加速电子束辐照的丝素蛋白纤维粉碎。未辐射的丝纤纤维根本没有被粉碎。但是增加的辐射越多，从纤维到粉末的转化效率就越高。丝素蛋白纤维在氧气中辐照1000 kGy的转化效率为94％。丝素蛋白粉显示出显着的溶解性，将其57％溶解在环境温度的水中。一个很有趣的现象是，未经化学处理的丝素蛋白仅被粉碎就溶解了。为了研究丝素蛋白粉的增溶机理，分析了丝素蛋白粉可溶部分的氨基酸成分。辐射剂量越大，甘氨酸或丙氨酸的降解越多，但降解率达到约50％。其他氨基酸甚至最多也只能降解20％。考虑到丝心蛋白的晶体结构，建议在丝心蛋白纤维上辐射选择性地降解无定形区域中的甘氨酸和丙氨酸，这使得粉碎和溶解丝心蛋白粉末成为可能。

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