Absrtact: The effects of microwave vacuum drying, natural sun drying, microwave drying equipment, vacuum drying and hot air drying on the drying curve, polysaccharides, total phenols, total saponins, 5-carboxymethyl furfural content and antioxidant activity of Polygonatum were studied.
Polysaccharides, phenols, saponins and 5-hydroxymethyl furfural in Polygonatum sibiricum were extracted by ultrasound-assisted method, and their contents were determined by the methods introduced in the literature.
At the same time, the antioxidant activity of Polygonatum Polygonatum polysaccharide was detected by FRAP and superoxide anion free radical assay. The results showed that microwave vacuum drying had the highest drying rate and the shortest drying time. The loss of polysaccharides, total phenols and total saponins was the least. The production of 5-carboxymethyl furfural was small. The polysaccharide content of Polygonatum sibiricum in the dried product was 63.59 (+1.25) mg.g-1, and the inhibition rate of 20 mg.mL-1 polysaccharide solution on superoxide anion free radicals was 30.01 (+1.3). 0%). It is concluded that microwave vacuum drying method is more suitable for obtaining high quality xanthate dried products.
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