Data for: Synthesis of 1,4-diazabicyclo[2.2.2]octane and pyridinium based cationic polymers via ROMP and examination of their antibacterial activity and cytotoxicity

This paper focuses on the synthesis of cationic antibacterial polymers that could be a potential for new generation antibiotics with well-defined architecture derived by Ring Opening Metathesis Polymerization (ROMP) technique. Mono and double charge bearing quaternary groups have been used to synthesize cationic homopolymers (MWs: 3000 and 10000 g/mole) and their copolymers (MWs: 5000 g/mole). Hemolytic concentration (HC50, ≥1000 µg/mL) and MTS assay results showed that the polymers are non-toxic. It has been observed the double charge bearing polymers has the highest antimicrobial activity (S. aureus= 8 µg/mL) and a high selectivity with a value of 250 against S. aureus. Percent killing efficiencies were tested on glass surface and moderate killing efficiency was observed between a ranges 40-80% in 5 minutes. Cationic charge density and zeta potential studies were used to investigate mechanism of antimicrobial efficiency of the polymer in solution during the action against S. aureus to understand structure-activity relationship.

本研究聚焦于阳离子抗菌聚合物的合成，这类聚合物可通过开环易位聚合（Ring Opening Metathesis Polymerization, ROMP）技术制备得到结构明确的分子结构，有望成为新一代抗生素的候选材料。研究采用单电荷及双电荷季铵基团，合成了分子量（Molecular Weight, MW）分别为3000 g/mol和10000 g/mol的阳离子均聚物，以及分子量为5000 g/mol的阳离子共聚物。半数溶血浓度（Hemolytic Concentration, HC₅₀，≥1000 μg/mL）与MTS细胞毒性检测法（MTS assay）结果均表明，该类聚合物无明显细胞毒性。研究发现，带有双电荷的聚合物抗菌活性最高，对金黄色葡萄球菌（Staphylococcus aureus, S. aureus）的最低抑菌浓度为8 μg/mL，且针对该菌的选择性指数达250，表现出优异的选择性。研究还在玻璃表面测试了聚合物的杀菌效率，结果显示5分钟内其杀菌效率介于40%~80%，处于中等水平。为阐明该聚合物的构效关系（structure-activity relationship），研究通过阳离子电荷密度与zeta电位（zeta potential）分析，探究了其在溶液中针对金黄色葡萄球菌的抗菌作用机制。