安徽农业大学学报2017，Vol.44Issue(5)：749-755,7.DOI:10.13610/j.cnki.1672-352x.20171017.007
利用13C CP/MAS测定葛根淀粉晶体结构
Use of 13C CP/MAS in studying crystal structure properties of Kudzu starch
摘要
Abstract
A systematic research was conducted to assess general properties of Kudzu starch,including physical and physicochemical properties,such as particle size,granule distribution,thermal properties,morphol ogy,crystallite,and the relative amount of double helices and crystallinity.Kudzu starch granules showed a bimodal size distribution.The gelatinization and enthalpy temperature was 64.32℃ and 1.77 J·g-1,respectively.Crystal structures of Kudzu starch,including the crystalline,crystallinity,and double helix were precisely charac terized via 13C CP/MAS NMR spectroscopy.The Cl's chemical shift from 94 to 110 ppm revealed on the NMR spectroscopy contained two peaks after a sub-peak,indicating that crystallite of Kudzu is Cb-type.Furthermore,X-ray powder diffraction was employed for verifying the conclusion of CP/MAS spectroscopy,coherently.Dis tinct C-type signature doublets emerged at 20=5.7°,15.3°,17.2° and 17.5°,respectively,demonstrating the credi ble evidence to ensure the conclusion.The relative degree of crystallinity detected through 13C CP/MAS and XRD was 28.7％ and 19.18％,respectively.13C CP/MAS showed that a relative amount of double helix of 41.21％ ex ited in Kudzu starch.Potato starch was used as a control because potato and kudzu are tuberous root species.关键词
葛根淀粉/无定形葛根淀粉/13C CP/MAS NMR/XRD/CLSM/晶体结构Key words
Kudzu starch/amorphous kudzu starch/13C CP/MAS NMR/XRD/CLSM (confocal laser scanning microscopy)/crystal structure分类
轻工纺织引用本文复制引用
方玲玲,杜先锋..利用13C CP/MAS测定葛根淀粉晶体结构[J].安徽农业大学学报,2017,44(5):749-755,7.基金项目
国家自然科学基金(31471700)资助. （31471700）
