摘要
内外水势差是水分迁移的动力,水分由高水势向低水势迁移是机制。通过综述水势差及差值对水分迁移过程的影响,以确证该机制,为研究低能耗干燥提供数据和理论支撑。内部水势可以用水分活度表征,外部水势可以用环境相对湿度表征。内外水势差越大,水分迁移的动力越大。内部水势会随着水分含量、淀粉占比、孔隙率、外界环境温度的增加而升高;外部水势随着环境相对湿度的增加而升高。不同的水势调控方案可实现相同的水分迁移量,但对面制品的质量和能耗影响不同,为高质量面制品低能耗干燥工艺提供了设计思路。
The internal and external water potential difference is driving force of moisture migration.The mechanism refers to moisture migration of water moving from high water potential to the low.The above mechanism is confirmed by means of analyzing water potential differences and its effect on the moisture migration process,which will provide data and theoretical support for the study of low-energy drying technology.The internal water potential can be characterized by water activity,while external water potential can be characterized by environmental relative humidity.The greater the difference of waterpotential,the greater power of moisture migration.The internal water potential increases with increments of moisture content,starch ratio,porosity and ambient temperature.In contrast,the external water potential increases with the rise of environmental relative humidity.The control schemes of different water potential can achieve the same amount of water migration,but it has different effects on the quality and energy consumption of the wheat flour products,which provides an idea of design for the low-energy drying process of high-quality wheat flour products.
作者
巩艳菲
代美瑶
李芳
张波
应旦阳
Gong Yanfei;Dai Meiyao;Li Fang;Zhang Bo;Ying Danyang(Institute of Food Science and Technology,Chinese Academy of Agriculture Sciences,Key Laboratory of Agricultural Products Processing,Ministry of Agriculture and Rural Affairs ,Beijing 100193;CSIRO Agriculture&Food ,Melboume,VIC3030)
出处
《中国粮油学报》
EI
CAS
CSCD
北大核心
2020年第3期195-202,共8页
Journal of the Chinese Cereals and Oils Association
基金
国家小麦产业技术体系(CARS-03)。
关键词
水分
水分活度
相对湿度
迁移速率
moisture
water activity
relative humidity
rate of moisture migration
