Antimicrobial materials with immobilized particles are of considerable interest. Sulfur, as one of the abundant elements on earth, is cheap and environmentally friendly; therefore, sulfur particles (SPs) can be used as an effective, nontoxic and low‐cost alternative to metal particles. SPs were prepared by precipitation method using sodium thiosulfate and hydrochloric acid in the presence of chitosan as a stabilizer. Further, SPs were grafted on polyethylene terephthalate (PET) foil activated by ultraviolet radiation. The changes in surface properties of modified foils were characterized by contact angle measurement, electrokinetic analysis and X‐ray photoelectron spectroscopy (XPS). The contact angle decreased on the UV‐treated sample, owing to the formation of oxidized groups. The presence of nitrogen and sulfur on the polymer surface, revealed by XPS, showed that chitosan‐capped SPs were bound to this surface. The surface morphology of samples and particle sizes were examined by scanning electron microscopy. The size of SPs increased after grafting on surface to a few micrometres. The antibacterial activity of the PET samples was tested against Staphylococcus epidermidis and Escherichia coli bacteria strains. UV‐treated samples grafted with one of the tested chitosan‐capped SPs demonstrated antibacterial effect against both of the bacteria strains. This new nanocomposite has potential to be used in medical applications as an antibacterial agent or in food processing as an antimicrobial food packaging material. Food spoilage caused by microorganisms such as E. coli during distribution and storage has a major impact on food quality and shelf life.

中文翻译：

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壳聚糖封端的硫微粒接枝到经过紫外线处理的PET表面

具有固定化颗粒的抗菌材料引起了人们的极大兴趣。硫作为地球上丰富的元素之一，价格便宜且对环境无害。因此，硫颗粒（SP）可以用作金属颗粒的有效，无毒且低成本的替代品。在壳聚糖作为稳定剂的情况下，采用硫代硫酸钠和盐酸通过沉淀法制备SP。此外，将SPs接枝到通过紫外线辐射活化的聚对苯二甲酸乙二醇酯（PET）箔上。通过接触角测量，电动分析和X射线光电子能谱（XPS）表征了改性箔的表面性能变化。由于形成了氧化基团，经紫外线处理的样品的接触角减小。聚合物表面存在氮和硫，XPS揭示的结果表明，壳聚糖封端的SP与该表面结合。通过扫描电子显微镜检查样品的表面形态和粒径。在表面上接枝到几微米后，SP的尺寸增加。测试了PET样品的抗菌活性表皮葡萄球菌和大肠杆菌菌株。用一种经过测试的壳聚糖封端的SP接枝的经紫外线处理的样品显示出对两种细菌菌株的抗菌作用。这种新的纳米复合材料有潜力在医疗应用中用作抗菌剂或在食品加工中用作抗菌食品包装材料。在分发和存储过程中，由微生物（如大肠杆菌）引起的食物变质对食物质量和保质期有重大影响。