期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 43, 期 2, 页码 216-220出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2008.04.005
关键词
C-type starch; polymorphs; crystalline lamella; electron diffraction
C-type starch granule could be considered as the mixture of A- and B-polymorphs. The ultrastructure of C-type starch granules has not been elucidated detailedly by comparison with that of A- or B-type starch. To better understand the ultrastructure of C-type starch granules, Environment Scanning Electron Microscope (ESEM) and Field Emission Gun Transmission Electron Microscope (FEG-TEM) have been used to analyze the conformation and ultrastructure of C-type starch granule from Rhizoma Dioscorea during acid hydrolysis. SEM results showed that the amorphous areas were mainly located interior part of C-type starch granules whereas the crystalline regions were found mostly in the peripheral region of the granules. The grain size can be confirmed to be about 4.5-9 nm from the HR-TEM micrographs. The nanocrystals from acid-thinned starch displayed the typical face-centered cubic structure. This selected area electron diffraction patterns showed that individual C-type starch granule consisted of A- and B-type polymorphs. (C) 2008 Elsevier B.V. All rights reserved.
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