By increasing the number of subchain and length the high molecule flocculant with higher efficient ( VCG ) was prepared by chitosan with vanillic aldehyde and the best condition was determined .

利用壳聚糖与 香草醛之间的希夫碱反应，对壳聚糖的分子进行修饰，增加其支链数目与长度，制备出更为高效的天然高分子絮凝剂VCG，并 初步确定了 反应条件。