海带晾晒干燥特性及干燥模型研究

为探究新鲜海带在晾晒情况下海带总多糖、甘露醇和褐藻胶含量的变化,掌握其晾晒干燥特性并建立可准确预测干燥进程的干燥模型,以湿基含水率、干燥速率、干燥时间为指标,海带湿基含水率达到18％以下作为干燥终点,分析山东荣成海域海带在光照度大于30000 Lx且相对湿度小于70％情况下晾晒,湿基含水率以及海带总多糖、甘露醇和褐藻胶...

Study on drying characteristics and drying model of kelp

In order to explore the changes of total polysaccharide,mannitol and algin content of fresh kelp under drying conditions,grasp its drying characteristics and establish a drying model that can accurately predict the drying process.The wet base moisture content of kelp reaches less than 18%as the drying end point.It is analyzed that the kelp in the Rongcheng sea area of Shandong Province is dried under the condition that the light intensity is greater than 30000 Lx and the relative humidity is less than 70%from June to July.Changes in the content of alcohol and algin,and the kelp drying model was established by fitting six drying mathematical models.The results show that the root thickness of kelp is different,but the initial moisture content is similar,which is between 88%and 92%.The drying process is mainly divided into adjustment stage,fast precipitation stage and slow precipitation stage,and the drying rate goes through two stages of acceleration and deceleration.Different fresh kelp had different initial total polysaccharide,mannitol and algin content.After long-term drying,the total polysaccharide content decreased the most,followed by alginate,and mannitol changed the least.Using six common drying mathematical models to fit and analyze,the mean value of Page model R² is 0.990,and the mean value of root mean square error R_MSE is 0.0224,which can best describe the moisture change of kelp during drying.A set of data outside the modeling was selected for verification analysis,and the correlation coefficient between the simulated and measured M_R values was 0.995(P<0.05),and the two were significantly correlated,indicating that the model can relatively well describe the natural drying of fresh kelp.Changes in moisture content over time during drying.The research results can provide a theoretical reference for the later joint drying research with heat pump.