Effects of Different Drying Methods on Quality of Lanzhou Baihe[Lilium davidii var.willmottiae(E.H.Wilson)Raffill]
Objective To study the suitable drying method based on the appearance quality and main quality index of Lanzhou Baihe[Lilium davidii var.willmottiae(E.H.Wilson)Raffill]after drying by different drying methods.Methods Different tem-perature drying,sun drying,shade drying,vacuum drying and freeze drying were used to extract the extracts by cold immersion method.The content of Regaloside A was determined by HPLC.The contents of lilioside polysaccharide and total flavone were determined by ultraviolet spectrophotometry.Results The comprehensive evaluation of vacuum drying and freeze drying was the best,followed by 80～100 ℃ drying.Vacuum drying treatment had the highest drying rate,the highest contents of polysaccharide and Regaloside A and the lowest total ash,which were 56.77％,23.13％,1.95 mg·g-1 and 3.26％,respectively.The contents of freeze drying extract and total flavonoids were the highest,which were 66.07％and 3.84 mg·g-1,respectively,followed by vacuum drying.In the drying treatment,the highest contents of polysaccharide,total flavone and Regaloside A were 21.30％,3.28 mg·g-1 and 1.81 mg·g-1,respectively.The highest extract content was 56.83％when drying at 90℃,and there was no significant difference between 100 ℃ and 90℃(P＞0.05).The energy consumption of freeze drying was high,and the time cost of drying in the shade and in the sun was high.From the comprehensive consideration of appearance quality,the main index com-ponents and energy consumption,it is concluded that vacuum drying and 100 ℃ drying are suitable methods for the drying of Lanzhou Baihe[Lilium davidii var.willmottiae(E.H.Wilson)Raffill].
Lanzhou Baihe[Lilium davidii var.willmottiae(E.H.Wilson)Raffill]drying methodquality of appearancemain quality indicatorsenergy consumption
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