本文以柚子果皮为材料，采用热水提取结合低温醇沉制备柚皮多糖。通过扫面电镜和化学方法分析研究六种烟叶载体物理结构和化学成分的差异，并研究柚皮多糖在不同烟叶载体上保润动力学。扫面电镜表明不同载体表面光滑度不同，表皮气孔数量也不相同，上部叶B3F表皮气孔排布要比中部叶C2F致密一些，中部叶C2F表皮气孔排布又比下部叶B1F要致密一些。化学成分有机酸含量DY2含量最高为28.1%，DY3最低为16.2%。多酚含量由2.2 mg/kg增加至5.58 mg/kg，品种间有显著差异。总糖含量最高是C2F为26.37%，显著高于其它几种，烟碱含量DY1最低为2.82%，B3F最高为5.12%。保润特性表明：自身保润特性呈现一定的差异，柚皮多糖在六种烟叶载体上保润动力学呈现不同的变化趋势，对B3F载体的保润效果最佳，对B1F载体的保润效果相对较差。

Pomelo peel was used to prepare polysaccharide by hot water extraction and organic solvent precipitation combined with low temperature. Differences of the physical structure and chemical composition of six tobacco carriers were determined by scanning electron microscopy (SEM) and chemical analysis. The moisturizing dynamics of polysaccharides from pomelo peel on the carriers were also studied..The results showed that the different carriers had different smoothness and stomata. The distribution of stomata on upper leaves B3F was higher than that in the middle leaves C2F. The lowest distribution was found in leaves B1F. The chemical composition showed that organic acid content DY2 was the highest of 28.1%, and DY3 was the lowest of 16.2%. The polyphenol content increased from 2.2 mg/kg to 5.58 mg/kg, and there was significant difference among varieties. Total sugar content exhibited the highest in C2F of 26.37%, and was significantly higher than that of other parts. The nicotine content was the minimum in DY1 for 2.82%, while the maximum value was found in B3F for 5.12%. The moisturizing properties showed the moisturizing dynamics of polysaccharides from pomelo peel on the six carriers had different trends. The moisturizing effect on B3F was the best, and relatively poor in B1F.

广东中烟科技项目（粤烟工05XM-QK[2011]028）