结论：乙酸是催化剂，对缩合反应有利，希夫碱化合物具有一定抗菌活性。
Conclusion: Acetic acid is an important catalyst in the condensation reaction. Schiff bases had antibacterial activity.
在水溶液中，壳聚糖与香草醛发生希夫碱反应，生成改性壳聚糖vcg。
Chitosan react with vanillin aldehyde by Schiff's base reaction in water, a polymer product-VCG can be prepared.
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