Sadowski Rafał, Strus Magdalena, Buchalska Marta, Heczko Piotr B, Macyk Wojciech
Faculty of Chemistry, Jagiellonian University in Krakow, ul. Ingardena 3, 30-060 Kraków, Poland.
Photochem Photobiol Sci. 2015 Mar;14(3):514-9. doi: 10.1039/c4pp00270a.
Commercially available polypropylene foil was pretreated with a low temperature oxygen plasma and covered with a thin film of nanocrystalline titanium dioxide by dip coating. The films were then photosensitized by titanium(IV) surface charge transfer complexes formed by impregnation with catechol. The photoactivity of the coatings up to 460 nm was confirmed by photoelectrochemical measurements. The photoinactivation of Escherichia coli and Staphylococcus aureus was evaluated by a glass adhesion test based on ISO 27447:2009(E) in the presence of visible light. The coating showed good antimicrobial activity induced by light from a light-emitting diode (405 nm), in particular towards E. coli ATCC 25922 strain. Adaptation of ISO 27447:2009(E) to assess bacterial photoinactivation by photocatalytic coatings will allow this procedure to be applied for the comparison of photoactivity under a range of irradiation conditions.
市售聚丙烯箔先用低温氧等离子体进行预处理，然后通过浸涂法覆盖一层纳米晶二氧化钛薄膜。接着，通过用儿茶酚浸渍形成的钛（IV）表面电荷转移络合物对薄膜进行光敏化处理。通过光电化学测量证实了涂层在460nm以下的光活性。基于ISO 27447:2009(E)，在可见光存在下，通过玻璃粘附试验评估了大肠杆菌和金黄色葡萄球菌的光灭活情况。该涂层在发光二极管（405nm）发出的光诱导下表现出良好的抗菌活性，尤其是对大肠杆菌ATCC 25922菌株。采用ISO 27447:2009(E)来评估光催化涂层对细菌的光灭活作用，将使该程序可用于比较一系列辐照条件下的光活性。
