Effects of Different Drying Methods on Rehydration Characteristics and Quality of Dictyophora rubrovolvata
Objective:To study the effects of different drying methods on rehydration characteristics and quality of Dictyophora rubrovolvata.Methods:Three kinds of dried Dictyophora rubrovolvata by vacuum freezing,hot air and microwave were rehydrated to equilibrium in warm water at 45 ℃,and the rehydration ratio,texture,aroma and nutrition of Dictyophora rubrovolvata were compared by color difference meter,gas chromatography-mass spectrometer(GC-MS)and ultraviolet spectrophotometer.Results:The rehydration ratio was vacuum freezing(12.48)＞hot air(9.63)＞microwave(8.64).Color difference:vacuum freezing(12.090)＜hot air(15.893)＜microwave(19.240);Shear force:hot air(1402.56 g)＞vacuum freezing(1215.34 g)＞microwave(983.47 g).Vacuum-frozen Dictyophora rubrovolvata has good rehydration characteristics,moderate shear force,and its color is close to fresh products.Except polysaccharide,the nutrients are closest to fresh products.The rehydration ratio of Dictyophora rubrovolvata dried by hot air is in the middle,and shear force is larger,and the texture is hard and the color is poor,so it is difficult to retain nutrients.Microwave-dried Dictyophora rubrovolvata has the worst rehydration,soft texture,and different color from fresh ones,but the polysaccharide content is close to fresh ones.After vacuum freezing,hot air and microwave drying Dictyophora rubrovolvata was rehydrated,81,102,80 kinds of aroma substances were detected respectively,among which alcohols,hydrocarbons,esters and ketones were the important components of aroma substances of Dictyophora rubrovolvata.Vacuum freezing can keep the aroma substances,and hot air drying is beneficial to the generation of sulfur-containing compounds,so the aroma substances are the most abundant,and microwave drying loses all the aroma substances except phenols.Conclusion:Generally speaking,vacuum freezing has the least effect on the quality of Dictyophora rubrovolvata,and the aroma substances are retained to some extent,followed by hot air drying,which is beneficial to the generation and enrichment of aroma substances.To sum up,both vacuum freezing and hot air drying can be used to dry Dictyophora rubrovolvata,and the drying method can be selected according to different requirements such as time,cost and quality.
different drying methodsDictyophora rubrovolvata dry productrehydration characteristicstexturearomanourishment
万方数据
维普
