摘要
为改善细菌纤维素(Bacterial Cellulose,简称BC)的复水性能及降低干燥细菌纤维素的成本,采用热风-冷冻复式干燥的方式对细菌纤维素进行干燥处理,确定其最佳干燥的工艺参数,并对干燥后样品做表征分析。结果表明:热风干燥温度为50℃,干燥时间150 min,-80℃冷冻干燥28.5 h,干燥后细菌纤维素的复水率达到56%,较热风干燥复水率提高250%,较冷冻干燥时间缩短42%。X衍射及表面接触角结果显示,热风-冷冻复式干燥较热风干燥处理BC结晶度和接触角变小,避免BC微纤维间氢键缔合提高其复水性能。
To improve the bacterial cellulose rehydration performance and reduce the cost of drying bacterial cellulose, drying process combined with hot air and freezing was adopted to dehydrate bacterial cellulose, determine the optimal drying technological parameters, and the dry sample characterization analysis. The conditions are as follows： hot air-drying temperature is 50 ℃ and drying time is 150 min, then freezing-drying time is 28.5 hours when water content of sample is 40%. The results show that the rehydration rate achieves 56% where increases by 250% than that of hot air-drying process, and drying time reduces by 42% than that of freezing-drying. Moreover, X radial diffraction and surface water contact angle indicate that BC crystallinity and contact angle decrease obviously than hot air drying processing and avoid hydrogen bond association between micro fiber in BC.
出处
《食品科技》
CAS
北大核心
2016年第10期228-233,共6页
Food Science and Technology
基金
榆林轻工绿色产业技术研发及示范基地项目(2012cxy1-9)
关键词
细菌纤维素
复水性
干燥
X衍射
表面接触角
bacterial cellulose
rehydration performance
drying processes
X radial diffraction
surface water contact angle
