Granular structure and allomorph position in C-type Chinese yam starch granule revealed by SEM,C CP/MAS NMR and XRD |
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Authors: | Shujun Wang Jinglin Yu Qinghua Zhu Jiugao Yu Fengmin Jin |
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Affiliation: | 1. School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China;2. College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China;3. Department of Chemistry, College of Science, Tianjin University, Tianjin 300072 China;4. College of Chemistry and Chemical Engineering, Tianjin University, Tianjin 300072, China |
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Abstract: | The crystalline microstructure and polymorphism of C-type starch from Chinese yam were evaluated by scanning electron microscope (SEM), 13C cross-polarization magic-angle spinning NMR (13C CP/MAS NMR) and powder X-ray diffraction (XRD) technique and acid hydrolysis method. Morphological changes during acid hydrolysis showed that the amorphous or the less crystalline areas were essentially located at the center part of C-type starch granules whereas the semi-crystalline and amorphous growth rings were found mainly in the outer part of the granules. 13C CP/MAS NMR and XRD results revealed that B-type allomorph was hydrolyzed more rapidly than A-type one. The amorphous or less crystalline areas were predominantly composed of B-allomorph whereas the outer semi-crystalline and amorphous growth rings were mostly composed of A-type allomorph. The A- and B-type allomorph coexisted in the individual C-type starch granule. B-type allomorph basically existed at the center part of the granules which was surrounded by the A-type allomorph in the peripheral part of granules. |
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Keywords: | C-type starch Ultrastructure Allomorphs Growth rings |
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