Splintering of Poly(3-hydroxybutyrate) Single Crystals by PHB-Depolymerase A from Pseudomonas lemoignei

来自 ACS

阅读量:

48

摘要:

With the aim of improved understanding of the mechanism of depolymerase action, folded chain lamellar single crystals were partially degraded with PHB-depolymerase A from Pseudomonas lemoignei. Enzymatically degraded single crystals of bacterial poly(3-hydroxybutyrate), PHB, were observed by transmission electron microscopy and were found to be splintered parallel to their long axes. Prior to degradation, the crystals were lamellar with macroscopic dimensions of approximately 2.5 μm by 20 μm and the classical baseplane single crystal diffraction pattern corresponding to bacterial PHB was recorded. When observed by TEM, the partially degraded crystals had been splintered longitudinally to a needlelike morphology. The needlelike fragments of PHB still yielded the same crystalline baseplane diffraction pattern. These results support an "edge attack" model for the degradation of PHB single crystals and explain, at a molecular level, the lack of decrease in molecular weight during the degradation since the direction of chain folding is parallel to the long axis of the crystals. The proposed mechanism explains the conversion of PHB spherulite lamellae into a needlelike morphology and suggests that PHB-depolymerase A has both endo and exo activity.

展开

DOI:

10.1021/ma961219u

被引量:

244

年份:

1996

通过文献互助平台发起求助,成功后即可免费获取论文全文。

相似文献

参考文献

引证文献

来源期刊

Macromolecules
1996/12/16

研究点推荐

引用走势

2002
被引量:29

辅助模式

0

引用

文献可以批量引用啦~
欢迎点我试用!

关于我们

百度学术集成海量学术资源,融合人工智能、深度学习、大数据分析等技术,为科研工作者提供全面快捷的学术服务。在这里我们保持学习的态度,不忘初心,砥砺前行。
了解更多>>

友情链接

百度云百度翻译

联系我们

合作与服务

期刊合作 图书馆合作 下载产品手册

©2025 Baidu 百度学术声明 使用百度前必读

引用