Mitoraj Dariusz, Jańczyk Agnieszka, Strus Magdalena, Kisch Horst, Stochel Grazyna, Heczko Piotr B, Macyk Wojciech
Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Kraków, Poland.
Photochem Photobiol Sci. 2007 Jun;6(6):642-8. doi: 10.1039/b617043a. Epub 2007 Apr 2.
Visible light induced photocatalytic inactivation of bacteria (Escherichia coli, Staphylococcus aureus, Enterococcus faecalis) and fungi (Candida albicans, Aspergillus niger) was tested. Carbon-doped titanium dioxide and TiO2 modified with platinum(IV) chloride complexes were used as suspension or immobilised at the surface of plastic plates. A biocidal effect was observed under visible light irradiation in the case of E. coli in the presence of both photocatalysts. The platinum(IV) modified titania exhibited a higher inactivation effect, also in the absence of light. The mechanism of visible light induced photoinactivation is briefly discussed. The observed detrimental effect of photocatalysts on various microorganism groups decreases in the order: E. coli > S. aureus approximately E. faecalis>>C. albicans approximately A. niger. This sequence results most probably from differences in cell wall or cell membrane structures in these microorganisms and is not related to the ability of catalase production.
测试了可见光诱导的细菌（大肠杆菌、金黄色葡萄球菌、粪肠球菌）和真菌（白色念珠菌、黑曲霉）的光催化失活情况。碳掺杂二氧化钛和用四氯化铂配合物改性的二氧化钛用作悬浮液或固定在塑料板表面。在两种光催化剂存在的情况下，在可见光照射下观察到对大肠杆菌有杀菌作用。经铂（IV）改性的二氧化钛即使在无光照的情况下也表现出更高的失活效果。简要讨论了可见光诱导光失活的机制。观察到光催化剂对各种微生物群体的有害作用按以下顺序降低：大肠杆菌>金黄色葡萄球菌≈粪肠球菌>>白色念珠菌≈黑曲霉。这个顺序很可能是由这些微生物细胞壁或细胞膜结构的差异导致的，与过氧化氢酶的产生能力无关。
