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Photocatalytic activity and antibacterial efficacy of UVA-treated titanium oxides.
Journal of Biomaterials Applications ( IF 2.9 ) Pub Date : 2020-07-19 , DOI: 10.1177/0885328220942669
Haden Andrew Johnson 1 , Randall Scott Williamson 1 , Mary Marquart 1 , Joel David Bumgardner 2 , Amol V Janorkar 1 , Michael David Roach 1
Affiliation  

Studies have shown ultraviolet-A (UVA) irradiation of crystalline titanium oxides leads to the production of reactive oxygen species (ROS) via a photocatalytic process. The ROS exhibit antimicrobial properties that may be of benefit in preventing bacterial attachment to implant devices. Recent studies have suggested a potential benefit of mixed anatase and rutile oxides and dopants on the photocatalytic properties of titanium oxides. The goal of this work was to compare the photocatalytic activity of different anodized commercially pure titanium grade 4 (CPTi4) surfaces. CPTi4 specimens were anodized in three mixed-acid electrolytes to create crystalline oxide surfaces that were either primarily anatase, primarily rutile, or a combination of anatase and rutile. Additionally, the primarily anatase and combination oxides incorporated some phosphorous from the phosphoric acid component in the electrolyte. The photocatalytic activity of the anodized specimens was measured using both methylene blue (MB) degradation assay and comparing the attachment of S. aureus under irradiation with UVA light of differing intensities (1 mW/cm2, 8 mW/cm2, and 23 mW/cm2). Primarily rutile oxides exhibited significantly higher levels of MB degradation after exposure to 1 mW/cm2 UVA lights. Primarily rutile specimens also had the largest reduction in bacterial attachment followed by the mixed phase specimens and the primarily anatase specimens at 1 mW/cm2 UVA lights. Phosphorous-doped, mixed phase oxides exhibited an accelerated MB degradation response during exposure to 8 mW/cm2 and 23 mW/cm2 UVA lights. All anodized and unanodized CPTi4 groups revealed similar S. aureus attachment at the two higher UVA intensities. Although MB degradation assay and the bacteria attachment assay both confirmed photocatalytic activity of the oxides formed in this study, the results of the MB degradation assay did not accurately predict the oxides performance against S. aureus.



中文翻译:

UVA处理的二氧化钛的光催化活性和抗菌功效。

研究表明,晶体氧化钛的紫外线-A (UVA) 照射会导致通过光催化过程产生活性氧 (ROS)。ROS 表现出抗菌特性,可能有助于防止细菌附着在植入装置上。最近的研究表明混合锐钛矿和金红石氧化物和掺杂剂对氧化钛的光催化性能有潜在的好处。这项工作的目的是比较不同阳极氧化的商业纯钛 4 级 (CPTi4) 表面的光催化活性。CPTi4 样品在三种混合酸电解液中进行阳极氧化,以产生主要为锐钛矿、主要为金红石或锐钛矿和金红石组合的结晶氧化物表面。此外,主要的锐钛矿和复合氧化物从电解液中的磷酸组分中加入了一些磷。使用亚甲蓝 (MB) 降解试验和比较阳极氧化试样的光催化活性金黄色葡萄球菌在不同强度(1 mW/cm 2、8 mW/cm 2和 23 mW/cm 2)的UVA 光照射下。主要是金红石氧化物在暴露于 1 mW/cm 2 UVA 光后表现出显着更高水平的 MB 降解。主要是金红石样品的细菌附着减少幅度最大,其次是混合相样品和主要锐钛矿样品,在 1 mW/cm 2 UVA 光下。磷掺杂的混合相氧化物在暴露于 8 mW/cm 2和 23 mW/cm 2 UVA 光期间表现出加速的 MB 降解响应。所有阳极氧化和未阳极氧化的 CPTi4 组都显示出相似的金黄色葡萄球菌在两个较高的 UVA 强度下附着。尽管 MB 降解试验和细菌附着试验都证实了本研究中形成的氧化物的光催化活性,但 MB 降解试验的结果并没有准确预测氧化物对金黄色葡萄球菌的性能。

更新日期:2020-07-20
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