Change of Several Nutrients in Jun Jujube during Drying Process

Three drying methods including natural drying,hot air drying and vacuum freeze-drying were used to explore the change rule of vitamin C,total acids,total sugar,sucrose,fructose,glucose and soluble proteins in Xinjiang grown Jun jujubes during drying process.The results showed that the contents of vitamin C and total acids revealed a decline,the contents of total sugar,fructose and glucose exhibited an increase trend while the content of sucrose declined,and the content of soluble proteins revealed an initial decrease followed by an increase in Jun jujubes during three drying processes.The impact of three drying methods on retention rate of the above-mentioned nutrients was different.Vacuum freeze-drying resulted in the highest retention rate,followed by hot air drying and natural drying.