DEPOLYMERIZATION OF SCHIZOPHYLLAN BY GAMMA-RAY IRRADIATION

被引:0
作者
TABATA, K
ITO, W
HIRATA, A
KOJIMA, T
机构
来源
NIPPON NOGEIKAGAKU KAISHI-JOURNAL OF THE JAPAN SOCIETY FOR BIOSCIENCE BIOTECHNOLOGY AND AGROCHEMISTRY | 1992年 / 66卷 / 11期
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中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Schizophyllan, an antitumor (1-->3)-beta-D-glucan that takes on a triple helical structure in aqueous solution, was irradiated with gamma-ray at doses of 0.058 to 8.4 Mrad. The molecular weight of the polysaccharide decreased as the dose of radiation increased, and the number of reducing group increased. Methylation analysis by enzymic hydrolysis with exo-beta-1,3-glucanase and antitumor tests showed that the polysaccharide after irradiation at 0.058 or 0.26 Mrad had essentially the same chemical structure and antitumor activity as native schizophyllan. Treatment at 2 or 8.4 Mrad caused changes in the chemical structure and antitumor activity. The depolymerization mechanism seemed to be different from that caused by ultrasonic treatment or hydrodynamic shearing, because irradiation most readily caused changes in the chemical structure and antitumor activity.
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页码:1633 / 1640
页数:8
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