Modified oligochitosan for aquaculture and preparation method thereof

The invention discloses modified oligochitosan for aquaculture and a preparation method thereof. The preparation method includes: adopting piperazinedione acid to graft C2-NH2 on oligochitosan high in antibacterial performance; grafting quaternary ammonium salt with C6-OH on oligochitosan modified by piperazinedione acid to prepare and synthesize the modified oligochitosan. The preparation method is simple to operate and safe in operation environment, and both antibacterial performance and dissolubility of an oligochitosan derivative obtained are improved obviously. 本发明公开了一种用于水产养殖的改性低聚壳聚糖及其制备方法。首先采用哌嗪二酮酸对抑菌较强的低聚壳聚糖上的C-NH进行接枝；之后再对用哌嗪二酮酸改性的低聚壳聚糖上C-OH接枝季铵盐，制备合成改性低聚壳聚糖。该制备方法，操作简单、操作环境安全，所得低聚壳聚衍生物在抗菌性能和溶解方面均得到了明显改善。