摘要
为了探索菊粉的贮藏环境及其吸湿后晶体结构变化规律,采用静态吸附法考察菊粉在25℃、30℃和45℃条件下的吸湿特性,并利用X-射线衍射仪分析了菊粉晶体转变过程。实验发现菊粉具有良好的吸湿能力,并随着环境相对湿度和温度的提高而增强。当相对湿度为98%时,菊粉在30℃和45℃的吸湿率分别为40.5%和45.0%。菊粉在25℃、30℃和45℃时临界相对湿度分别为75.73%、87.54%和87.78%。X-射线衍射分析发现菊粉无吸湿时为无定形态结构,当吸湿率在6.50%～11.25%时,菊粉开始由无定形态结构向半晶体转变,且在2θ=9.1°时有一个衍射峰,当吸湿率大于11.25%时,晶体态的菊粉含量随吸湿率的增大而增加。
To explore the storage environment and crystal structure transformation of inulin after water absorption, the hygroscopicity of inulin at 25℃ , 30℃ and 45℃ were studied through static adsorption method. The crystal change was explored by using X-ray diffraction. The results showed that the moisture absorption ability of inulin was relative strong, which increased with increasing humidity and temperature. When the relative humidity of environment was 98% , the moisture absorption of inulin was 40.5% and 45.0% at 30℃ and 45℃, respectively. The values of critical relative humidity were 75.73% , 87.54% and 87.78% at 25℃, 30℃ and 45℃ , respectively. The X-ray diffraction results illustrated that inulin power was an amorphous structure in dry state. The change from amorphous state to semi-crystalline state would happen during the sorption content ranged from 6.50% to 11.25% with a peak of 20 of 9.1 ~. The crystal inulin increased with increasing humidity when the moisture absorption was higher than 11.25 %.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2012年第8期160-163,192,共5页
Transactions of the Chinese Society for Agricultural Machinery
基金
河南省教育厅自然科学研究计划资助项目(2008B550002)
河南科技大学SRTP资助项目(2011230)
关键词
菊粉
吸湿
晶体态
无定形态
Inulin, Moisture absorption, Crystal structure, Amorphous
