Effect of Drying Method on Phyto-salt Extraction Rate and Quality Characteristics of Spartina alterniflora
Vacuum freeze drying(VFD),hot air drying(HAD)and boiling evaporation drying(BED)were used to prepare phyto-salt from Spartina alterniflora.The drying characteristics and quality of phyto-salt were analyzed and evaluated from salt extraction,sensory quality,rehydration,dissolution time and microstructure.The results showed that the salt extraction rate of S.alterniflora through VFD treatment was 17.5%,which was higher than that though BED treatment(15%)and HAD treatment(16.5%).Under different drying methods,the sensory evaluation analysis of color,appearance,odor,taste and impurities showed that VFD treatment was the best.The rehydration degree of phyto-salt obtained by VFD treatment was the highest,up to 82%,and the dissolution time in water was the shortest.Electron microscopy showed that VFD treated phyto-salt particles were smaller and more porous,while phyto-salt under the other two drying methods had similar microstructure.Above all,VFD is a suitable method for preparing S.alterniflora phyto-salt.
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