壳聚糖-g-N-羧甲基-2-硫代-4，5-2H咪唑啉酮的制备及其抑菌性能

以2-溴乙酸、壳聚糖、2-硫代四氢咪唑啉酮为原料，合成了不同接枝率的壳聚糖-g-N-羧甲基-2-硫代-4，5-2H咪唑啉酮（CTS-g-CSIDZ）,并对其理化性质进行了考察。用络合滴定法测定了该聚合物对Cd²⁺，CrO4^2-,Fe³⁺,Cu²⁺,Pb²⁺等重金属离子的吸附作用；进行了聚合物的悬菌定量实验，测定了接枝聚合物对一系列细菌的抑制能力；采用失重法研究了合成的聚合物在1mol/L HCl溶液中对N80钢片腐蚀的抑制作用。结果表明，部分接枝的CSIDZ比小分子化合物具有更高的对测试的多数金属离子吸附作用的热稳定性；接枝CSIDZ具有较强的抑菌效果，最小抑菌浓度为5.10 g/L;接枝CSIDZ比小分子缓蚀剂具有更高的热稳定性，在90 ℃时对N80钢片的缓蚀效率仍然可以达到71.1％,且用量仅为小分子化合物CSIDZ的1/2。

Preparation of Chitosan-g-N-carboxymethyl-2-sulfo-4, 5-2H imidazolinone and its antibacterial behavior

Chitosan-g-N-carboxymethyl-2-sulfo-4,5-2H imidazolinone ( CSIDZ) with different grafting ratio polymers were synthesized with 2-bromoacetic acid, chitosan, 2-sulfo imidazolinone as raw materials. Their physical and chemical characteristics were studied. Adsorptions of synthesized polymers for metal ions, such as, Cd~(2+) , CrO~(2-)_4 , Fe~(3+) , Cu~(2+) , Pb~(2+) were determined with EDTA complexometric titration. The antibacterial activity of the grafted polymer was examined against a series of test microorganisms by quantitative suspension method; corrosion inhibition efficiency of the synthesized polymer in 1 mol/L HCl solutions for N80 steel panel was measured by mass-loss method. Results from the experiments indicate that the partially grafted CSIDZ made the complexing action of partially grafted CSIDZ to most tested metal ions higher thermal stability than small molecule-CSIDZ, the grafted polymer bears a relatively strong antibacterial activity, its MIC ( minimal inhibited concentration) is 5. 10 g/L and it has a higher thermal stability than small molecule inhibitor CSIDZ. Its inhibition efficiency still amounts to 71. 1% when temperature reaches to 90 ℃ , and the amount used is only 1/2 that of CSIDZ.