Wang Min, Yue Lin, Niazi Sobia, Khan Imran Mahmood, Zhang Yin, Wang Zhouping
State Key Laboratory of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China.
State Key Laboratory of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; International Joint Laboratory on Food Safety, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China; Collaborative Innovation Center of Food Safety and Quality Control, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China.
Int J Biol Macromol. 2022 May 1;206:886-895. doi: 10.1016/j.ijbiomac.2022.03.075. Epub 2022 Mar 17.
The modified natural biopolymers, recognized as environmentally friendly flocculants, are gaining tremendous attention in the field of water treatment. In this study, a novel hybrid flocculant with antibacterial activity, cinnamic acid (CA) conjugated N-(2-hydroxy)-propyl-3-trimethylammonium chitosan chloride (HTCC) derivative (HTCC-CA), was prepared via quaternary ammonium and amide reactions. The characterization, flocculation, and antibacterial activities were carried out to access the structural properties and potential application. The results of UV-vis, FT-TR, and H NMR confirmed the successful synthesis of HTCC-CA1-3 derivatives. XRD and TGA revealed the lower crystallinity and thermal stability of HTCC-CA1-3 derivatives than chitosan (CS). Bacterial flocculation and antibacterial tests indicated the excellent flocculation effect of HTCC-CA1-3 derivatives and showed high antibacterial activity for Escherichia coli suspension. Moreover, the mechanism of action of the derivatives was investigated via zeta potential measurements and scanning electron microscope, which can be summed up as the effective interaction between charges. The results proved that HTCC-CA derivatives are promising agents for wastewater treatment.
改性天然生物聚合物被认为是环境友好型絮凝剂，在水处理领域正受到极大关注。在本研究中，通过季铵化反应和酰胺反应制备了一种具有抗菌活性的新型复合絮凝剂，即肉桂酸（CA）共轭N-(2-羟丙基)-3-三甲基氯化铵壳聚糖（HTCC）衍生物（HTCC-CA）。对其进行了表征、絮凝和抗菌活性测试，以了解其结构性质和潜在应用。紫外可见光谱、傅里叶变换红外光谱和核磁共振氢谱的结果证实了HTCC-CA1-3衍生物的成功合成。X射线衍射和热重分析表明，HTCC-CA1-3衍生物的结晶度和热稳定性低于壳聚糖（CS）。细菌絮凝和抗菌测试表明，HTCC-CA1-3衍生物具有优异的絮凝效果，对大肠杆菌悬浮液表现出高抗菌活性。此外，通过zeta电位测量和扫描电子显微镜研究了衍生物的作用机制，其作用机制可归纳为电荷之间的有效相互作用。结果证明，HTCC-CA衍生物是有前途的废水处理剂。
