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Confined catalysis of MOF-818 nanozyme and colorimetric aptasensing for cardiac troponin I
Talanta ( IF 5.6 ) Pub Date : 2022-08-12 , DOI: 10.1016/j.talanta.2022.123830
Ruiting Wen 1 , Chunhong Zhou 1 , Jiuying Tian 1 , Jusheng Lu 1
Affiliation  

Understanding the catalytic performance of nanozymes assembled in confined environment is an interesting topic. Herein, a three-dimensional nanozyme-catalytic nanoreactor was constructed by confining MOF-818 nanozyme in the pore of macroporous tungsten trioxide (p-WO3). The catalytic activity of MOF-818 assembled in-situ for the oxidation of 3,5-Di-tert-butylcatechol (3,5-DTBC) could be regulated by changing the pore size of p-WO3. Only when being confined in the pores of p-WO3 with an appropriate pore size, MOF-818 could exhibit high affinity towards 3,5-DTBC, and excellent catalytic activity for 3,5-DTBC oxidation, the catalytic rate constant kcat and Michaelis constant Km were determined to be 31.47 s−1 and 1.42 mM, respectively, and the maximum yield of 3,5-DTBC oxidation reached 95.2%. Furthermore, the as-constructed nanozyme-catalytic nanoreactor could be designed to construct a colorimetric aptasensor for selective determining cardiac troponin I based on the enzymatic inhibition effect and the exonuclease I-assisted target recycling signal amplification, which exhibited a good linear range of 50 fg mL−1 - 100 ng mL−1, low detection limit of 18 fg mL−1, and was applied for human serum analysis with RSD less than 5.2% and the recoveries ranged from 95% to 107%.

中文翻译:


MOF-818 纳米酶的限制催化和心肌肌钙蛋白 I 的比色适配体感应



了解在密闭环境中组装的纳米酶的催化性能是一个有趣的话题。在此,通过将 MOF-818 纳米酶限制在大孔三氧化钨 (p-WO3) 的孔中,构建了三维纳米酶-催化纳米反应器。通过改变 p-WO3 的孔径,可以调节原位组装的 MOF-818 氧化 3,5-二叔丁基邻苯二酚 (3,5-DTBC) 的催化活性。只有当被限制在具有适当孔径的 p-WO3 孔中时,MOF-818 才能表现出对 3,5-DTBC 的高亲和力,并且对 3,5-DTBC 氧化具有优异的催化活性,催化速率常数 kcat 和 Michaelis 常数 Km 分别为 31.47 s−1 和 1.42 mM,3,5-DTBC 氧化的最大产率达到 95.2%。此外,构建后的纳米酶催化纳米反应器可以设计构建一个基于酶抑制作用和核酸外切酶 I 辅助靶标再循环信号放大的比色适体传感器,用于选择性测定心肌肌钙蛋白 I,表现出 50 fg mL-1 - 100 ng mL-1 的良好线性范围,18 fg mL-1 的低检出限,适用于人血清分析,RSD 小于 5.2%,回收率为 95% 至 107%。
更新日期:2022-08-12
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