摘要:
研究微波真空干燥法、自然晒干法、微波干燥法、真空干燥法和热风干燥法5种不同干燥方法对黄精干燥曲线和黄精多糖、总酚、总皂苷、5-羧甲基糠醛含量及多糖抗氧化活性的影响。分别采用超声波辅助法提取黄精中的黄精多糖、总酚、总皂苷、5-羟甲基糠醛,并运用文献介绍的方法测定其含量。同时用FRAP和超氧阴离子自由基检测法检测黄精多糖抗氧化活性。结果表明,微波真空干燥法干燥速率最大,所用干燥时间最短,黄精干燥产品中多糖、总酚、总皂苷含量损失最少,5-羧甲基糠醛生成量较小,其干燥品中黄精多糖含量达(63.59±1.25) mg·g-1,且其20 mg·mL-1多糖溶液对超氧阴离子自由基的抑制率达(30.01%±1.30%)。说明微波真空干燥法更适于得到高品质的黄精干燥产品。
Abstract:
The effects of five different drying methods,such as microwave vacuum drying, natural drying, microwave drying, vacuum drying and hot air drying,on the dry curve of Polygonatum sibiricum and the contents of polysaccharides,total phenolics, total saponins, 5-carboxymethylfurfural and the polysaccharide antioxidant activity were studied. The polysaccharides, total phenols,total saponins and 5-hydroxymethylfurfural of Polygonatum sibiricum were extracted by ultrasonic-assisted method respectively,and their contents were determined by the corresponding literature methods.At the same time,the antioxidant activity of Polygonatum polysaccharides was detected by FRAP and superoxide anion free radical assay.The results showed that the drying rate of microwave vacuum drying method was the highest and its drying time was the shortest,the contents of polysaccharides,total phenol and total saponins in the dried products of Polygonatum sibiricum were the least, and the furfural production of 5-carboxymethylfurfural was lesser.In addition,the polysaccharide content was(63.59±1.25) mg·g-1,and the inhibitory rate of 20 mg·mL-1 polysaccharide solution on superoxide anion radical was 30.01%±1.30%. The microwave vacuum drying method is more suitable for obtaining high-quality dried product of Polygonatum sibiricum.
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