摘要
为研究红薯微波干燥过程中水分的变化情况,绘制了红薯的微波干燥曲线,采用8种数学模型对干燥曲线进行拟合计算;同时应用低场核磁共振技术分析红薯微波干燥过程中内部水分状态及其变化规律,将低场核磁测试结果与干燥曲线相印证。结果表明:在所选的干燥模型中Modified Henderson and Pabis模型能够较好地反映红薯的微波干燥过程;低场核磁T2图谱峰总面积随微波干燥时间的变化规律与干燥曲线一致;在干燥过程中,结合水比例先降低后升高,说明在干燥的初始阶段,微波能够有效降低结合水与红薯组分的相互作用,可采用微波干燥与常规干燥技术相结合来进行红薯的干燥。
In order to study the moisture change of sweet potato during microwave drying,the microwave drying curve of sweet potato was plotted,eight mathematical models were used to fit the drying curve.At the same time,LF-NMR was applied to analyze the internal moisture state and its change rule during the microwave drying process of sweet potato.The results showed that the Modified Henderson and Pabis model could better reflect the microwave drying process of sweet potato.The variation of peak area of LF-NMR T2 spectrum with microwave drying time was consistent with the drying curve.In the drying process,the proportion of bound water decreases first and then increases,indicating that in the initial stage of drying,microwave can effectively reduce the interaction between bound water and sweet potato components,and microwave combined drying techniques can be used to dry sweet potato.
作者
刘传菊
汤尚文
李欢欢
豁银强
聂荣祖
LIU Chuanju;TANG Shangwen;LI Huanhuan;HUO Yinqiang;NIE Rongzu(Hubei University of Arts and Science,Hubei Food Ingredient Engineering Research Center,Xiangyang 441053)
出处
《食品科技》
CAS
北大核心
2019年第8期58-64,共7页
Food Science and Technology
关键词
低场核磁
红薯
微波干燥
LF-NMR
sweet potato
microwave drying
