金花葵花冷冻干燥工艺优化及产品特性研究

Optimum of Freeze-drying Technology of Flower of Aurea helianthustems and Study its Product Characteristics

为确定金花葵花冷冻干燥工艺条件,通过正交实验优化金花葵花冷冻干燥工艺条件,并比较不同干燥方法对产品特性的影响。结果表明:冷冻干燥优化工艺条件为预冻时间2.5h、铺放厚度3cm、隔板温度50℃、真空压强65Pa,在此条件下金花葵花复水比达到2.68g/g。经冷冻干燥、自然晾干、热风干燥、真空干燥处理的金花葵花总黄酮的保留率分别为95.26%、85.49%%、80.38%、89.35%。表明冷冻干燥的金花葵花品质优于自然晾干、热风干燥和真空干燥方法干燥的金花葵花品质。

In order to determine the technological conditions of freeze-drying of flower of Aurea helianthustems.Orthogonal experiment methodology were used to optimal technological conditions.The effects of different drying methods on product characteristics were compared.The result showed that optimal freeze-drying conditions are as follows:pre-freezing time 2.5 h,material thickness 3 cm,partition temperature 50℃,vacuum pressure 65 Pa.The rehydration rate was 2.68 g/g under the optimum conditions.The total flavonoids retention rates of freeze drying,natural air drying,hot air drying,vacuum drying were 95.26%,85.49%%,80.38%,89.35%.The results showed that the quality of freeze-dried flower of Aurea helianthustems was better than that of natural air drying,hot air drying and vacuum drying.