陕西科技大学学报2017，Vol.35Issue(6)：120-124,139,6.
干燥方法对细菌纤维素复水性能的影响
Influence of drying methods on rehydration quality of bacterial cellulose
摘要
Abstract
To investigate the influence of drying methods on the Bacterial cellulose (BC) re-hydration performance,hot air,microwave,vacuum freeze and freeze drying by gradient heat-ing were adopted to dry BC pellicles.The swelling rate and rehydration rate were compared. Furthermore,the microstructure,texture properties and crystallinity were analyzed.Finally, the results showed as follows :Different drying process could affected the BC structure, caused the change of crystallinity and the difference of rehydration performance.Compared with non-drying BC,the rehydration rate of BC employed freeze drying by gradient heating a-chieved 54.96%,which was 2.9 times than that of the vacuum freeze drying,29 and 31 times than that of microwave and hot air drying,respectively.Its swelling ratio and rehydration ca-pability were better than other drying methods.The next was vacuum freeze drying that re-hydration rate was 18.80%.The water absorption rate of microwave and hot-air drying was the slowest.And its rehydration rate was only 1.77% and 1.85% respectively.The results of environment scanning electron microscope (ESEM ) and X-ray diffraction indicated that the BC of freeze drying by gradient heating had looser fiber arrangement,so it maintained a well network structure,and the crystallinity could as low as 56.14%.The BC of vacuum freeze dr-ying expressed a close fiber arrangement.And the crystallinity was 60.56%.The BC fiber ar-rangement used hot air and microwave drying was tight and clutter,and presented higher crystallinity which was 63.12% and 72.64% respectively.A higher crystallinity would prob-ably lead to poor rehydration quality.The freeze drying by gradient heating was the best method of the four.关键词
细菌纤维素/热风干燥/微波干燥/真空冻干/梯度冻干/复水率Key words
bacterial cellulose/hot-air drying/microwave drying/vacuum freeze drying/freeze drying by gradient heating/rehydration rate分类
轻工纺织引用本文复制引用
罗仓学,张岢薇,丁勇..干燥方法对细菌纤维素复水性能的影响[J].陕西科技大学学报,2017,35(6):120-124,139,6.基金项目
陕西省教育厅专项科研计划项目(14JK1089) （14JK1089）
