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TiO2 Photocatalysis–DESI-MS Rotating Array Platform for High-Throughput Investigation of Oxidation Reactions
Analytical Chemistry ( IF 6.7 ) Pub Date : 2017-10-13 00:00:00 , DOI: 10.1021/acs.analchem.7b01638
Miina Ruokolainen 1 , Ville Miikkulainen 1 , Mikko Ritala 1 , Tiina Sikanen 1 , Tapio Kotiaho 1 , Risto Kostiainen 1
Affiliation  

We present a new high-throughput platform for studying titanium dioxide (TiO2) photocatalytic oxidation reactions by performing reactions on a TiO2-coated surface, followed by direct analysis of oxidation products from the surface by desorption electrospray ionization mass spectrometry (DESI-MS). For this purpose, we coated a round glass wafer with photocatalytically active anatase-phase TiO2 using atomic layer deposition. Approximately 70 aqueous 1 μL samples can be injected onto the rim of the TiO2-coated glass wafer, before the entire wafer is exposed to UV irradiation. After evaporation of water, the oxidation products can be directly analyzed from the sample spots by DESI-MS, using a commercial rotating sample platform. The method was shown to provide fast photocatalytic oxidation reactions and analysis with throughput of about four samples per minute. The feasibility of the method was examined for mimicking phase I metabolism reactions of amodiaquine, buspirone and verapamil. Their main photocatalytic reaction products were mostly similar to the products observed earlier in TiO2 photocatalysis and in in vitro phase I metabolism assays performed using human liver microsomes.

中文翻译:

TiO 2光催化–DESI-MS旋转阵列平台用于高通量研究氧化反应

我们提供了一个用于研究二氧化钛(TiO 2)光催化氧化反应的新高通量平台,该平台通过在TiO 2涂层的表面上进行反应,然后通过解吸电喷雾电离质谱法(DESI-MS)直接分析表面的氧化产物)。为此,我们使用原子层沉积法在圆形玻璃晶片上涂覆了具有光催化活性的锐钛矿相TiO 2。可以将大约70个1μL水性样品注入TiO 2的边缘-涂覆的玻璃晶片,然后将整个晶片暴露在紫外线照射下。水蒸发后,可以使用商用旋转样品平台通过DESI-MS从样品斑点直接分析氧化产物。结果表明该方法可提供快速的光催化氧化反应和分析,每分钟的通量约为4个样品。研究了该方法用于模拟氨二喹,丁螺环酮和维拉帕米的I期代谢反应的可行性。它们的主要光催化反应产物与早期在TiO 2光催化和使用人肝微粒体进行的体外I期代谢试验中观察到的产物相似。
更新日期:2017-10-14
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