摘要
利用固体核磁共振波谱仪(CP/MAS 13C NMR)、粉末X–射线衍射仪(XRD)和扫描电子显微镜(SEC)研究了烤烟烟叶淀粉晶体的结构特性。结果表明:烤烟烟叶淀粉晶体CP/MAS 13C NMR波谱显示在C1区域,在化学位移99.3和100.2处有2个明显的结晶峰,同时,XRD波谱2θ在17o处有较强的衍射峰,在5.6o、15o、20o、22o和24o附近有较弱的衍射峰,均表现出典型的B–型晶体特征。根据CP/MAS 13C NMR波谱计算出的烟叶淀粉晶体的相对结晶度和双螺旋含量分别为36.1%和21.3%,其结晶度比采用XRD波谱计算值略高。
The structure characteristics, crystalline characteristics and relative crystallinity of starches from flue-cured tobacco leaves were investigated with CP/MAS 13 C NMR, X？ray powder diffraction（XRD） and scanning electron microscopy（SEC）. The results indicated that there were typical doublets at about 99.3, 100.2 ppm in C1 spectrum of CP/MAS 13 C NMR from tobacco starch. The XRD spectra of tobacco starch showed the strongest diffraction peak at around 17° 2θ, and a few small peaks at around 5.6°, 15°, 20°, 22° and 24° 2θ, which was the characteristic peaks of B？type starch. The percentage of the relative crystallinity and double helix content calculated from CP/MAS 13 C NMR in tobacco starches were 36.1% and 21.3%, respectively. The relative crystallinity obtained from CP/MAS 13 C NMR was higher than that from XRD.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第1期44-48,共5页
Journal of Hunan Agricultural University(Natural Sciences)
基金
安徽中烟工业有限责任公司项目(2015125)
重庆中烟工业有限责任公司项目(JL/CYZYG SJ003–04)
关键词
烤烟
淀粉晶体
固体核磁共振波谱
结晶度
flue-cured tobacco
starch crystal
solid state nuclear magnetic resonance
crystallinity
