You need JavaScript to view this

Radiation degradation of silk

Abstract

Silk fibroin powder 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 fibroin 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%. Silk fibroin powder shows remarkable solubility, which dissolved 57% 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%. Other amino acids were degraded only 20% 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  More>>
Authors:
Ishida, Kazushige; Kamiishi, Youichi; [1]  Takeshita, Hidefumi; Yoshii, Fumio; Kume, Tamikazu [2] 
  1. Textile Research Institute of Gunma, Kiryu, Gunma (Japan)
  2. Japan Atomic Energy Research Inst., Takasaki, Gunma (Japan). Takasaki Radiation Chemistry Research Establishment
Publication Date:
Mar 01, 2001
Product Type:
Conference
Report Number:
JAERI-Conf-2001-005
Resource Relation:
Conference: Takasaki symposium on radiation processing of natural polymers, Takasaki, Gunma (Japan), 23-24 Nov 2000; Other Information: 4 refs., 5 figs., 1 tab.; PBD: Mar 2001; Related Information: In: Proceedings of the Takasaki symposium on radiation processing of natural polymers, by Kume, Tamikazu; Maekawa, Yasunari (eds.) [Japan Atomic Energy Research Inst., Takasaki, Gunma (Japan). Takasaki Radiation Chemistry Research Establishment], 288 pages.
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; RADIOLYSIS; PROTEINS; ELECTRON BEAMS; IRRADIATION; PULVERIZERS; AMINO ACIDS; GLYCINE; ALANINES; SOLUBILITY; AMORPHOUS STATE; POWDERS
OSTI ID:
20226912
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
TRN: JP0150466
Availability:
INIS
Submitting Site:
JPN
Size:
page(s) 130-138
Announcement Date:

Citation Formats

Ishida, Kazushige, Kamiishi, Youichi, Takeshita, Hidefumi, Yoshii, Fumio, and Kume, Tamikazu. Radiation degradation of silk. Japan: N. p., 2001. Web.
Ishida, Kazushige, Kamiishi, Youichi, Takeshita, Hidefumi, Yoshii, Fumio, & Kume, Tamikazu. Radiation degradation of silk. Japan.
Ishida, Kazushige, Kamiishi, Youichi, Takeshita, Hidefumi, Yoshii, Fumio, and Kume, Tamikazu. 2001. "Radiation degradation of silk." Japan.
@misc{etde_20226912,
title = {Radiation degradation of silk}
author = {Ishida, Kazushige, Kamiishi, Youichi, Takeshita, Hidefumi, Yoshii, Fumio, and Kume, Tamikazu}
abstractNote = {Silk fibroin powder 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 fibroin 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%. Silk fibroin powder shows remarkable solubility, which dissolved 57% 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%. Other amino acids were degraded only 20% 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. (author)}
place = {Japan}
year = {2001}
month = {Mar}
}