Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia.
Int J Biol Macromol. 2018 May;111:1140-1145. doi: 10.1016/j.ijbiomac.2018.01.096. Epub 2018 Feb 19.
In the current study, a facile and an eco-friendly manganese oxide nanoparticles dispersed in chitosan (CS-MnO) nanocomposite was synthesized. A chemical precipitation method was used for the product synthesis. The product characterization was performed using various spectroscopic techniques such as X-ray scattering, scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis and zeta potential which confirmed its successful formation. The CS-MnO nanocomposite was evaluated in the Pb ions adsorption from it aqueous solution. The CS-MnO showed an approvable accomplishment for the removal of Pb ions and evidence was provided from the adsorption experiments. The efficiency of adsorbent did not change much even after 5 cycles of reuse. Therefore, CS-MnO would serve as promising adsorbent. Additionally, the CS-MnO nanocomposite showed low to moderate antibacterial efficacy against Escherichia coli and Staphylococcus aureus by inhibiting nearly 50% of the bacterial growth. Colony forming units method was used in the antibacterial studies which showed that the bio-nanocomposite had moderate antibacterial activity against the stated strains of bacteria.
在本研究中，制备了一种简便且环保的壳聚糖分散的氧化锰纳米粒子（CS-MnO）纳米复合材料。采用化学沉淀法进行产物合成。通过 X 射线散射、扫描电子显微镜、傅里叶变换红外光谱、热重分析和 zeta 电位等多种光谱技术对产物进行了表征，证实了其成功形成。在从水溶液中吸附 Pb 离子的实验中对 CS-MnO 纳米复合材料进行了评估。CS-MnO 对 Pb 离子的去除具有良好的效果，吸附实验提供了证据。即使经过 5 次重复使用，吸附剂的效率也没有太大变化。因此，CS-MnO 将是一种很有前途的吸附剂。此外，CS-MnO 纳米复合材料对大肠杆菌和金黄色葡萄球菌表现出低到中等的抗菌效果，抑制了近 50%的细菌生长。在抗菌研究中使用了集落形成单位法，表明该生物纳米复合材料对所研究的细菌菌株具有中等的抗菌活性。
