不同植物多糖对烟丝吸湿性和保润性的影响及其作用机制

以常见的烟草保润剂丙二醇和水为对照,比较了黄精多糖、葫芦巴多糖、小球藻多糖和灵芝多糖的吸湿保润效果,结果表明黄精多糖具有与丙二醇类似的吸湿性,但其保润效果显著优于丙二醇。以常见薄层干燥模型对烟丝低湿条件下的解吸过程进行非线性拟合,比较干燥速率常数(k)和解吸速率,发现添加黄精多糖的烟丝,干燥速率常数最小,解吸速率最慢。低场核磁(LF-NMR)结果表明,相比于空白烟丝和添加丙二醇的烟丝,黄精多糖的添加使得烟丝中物理结合水含量下降,化学结合水含量显著增加。因此,黄精多糖可以作为一种天然高效的保润剂应用于烟草,防止烟草在贮藏过程中水分的散失。

Moisture retention properties of polygonatum polysaccharide in tobacco and its mechanism

The moisture absorption and moisture retention properties of polygonatum polysaccharides, fenugreek polysaccha-rides, chlorella polysaccharides and ganoderma lucidum polysaccharides were investigated as compared with propylene glycol and water. The results showed that polygonatum polysaccharides had similar moisture absorption properties as propylene glycol, but its moisture retention was significantly better than that of propylene glycol. Therefore, the desorption process of tobacco under low humidity conditions was fitted nonlinearly by common thin-layer drying models. It was found that the tobacco added with polygonatum polysaccharides have the lowest drying rate constant and the slowest moisture retention rate. Low field nuclear magnetic (LF-NMR) results showed that, the addition of polygonatum polysaccharides reduced the physical bound water content where as the chemically bound water content in tobacco was increased. Therefore, polygonatum polysaccharides could be used as a natural and efficient humectant in tobacco to prevent the loss of moisture during storage.