化学
适体
检出限
线性范围
配位复合体
纳米技术
组合化学
色谱法
有机化学
遗传学
生物
材料科学
金属
作者
Weiwei Qiu,Feng Gao,Natsumi Yano,Yosuke Kataoka,Makoto Handa,Weiqiang Yang,Hidekazu Tanaka,Qingxiang Wang
出处
期刊:Analytical Chemistry
[American Chemical Society]
日期:2020-07-17
卷期号:92 (16): 11332-11340
被引量:56
标识
DOI:10.1021/acs.analchem.0c02018
摘要
Electrochemical aptasensors involved in chemical labeling are often single-use and sensitivity-limited because the probes are commonly single-point labeled and irreversible. In this work, the specific coordination between Zr4+ and phosphate group (−PO43–) was employed to construct a new aptasensor that is highly sensitive and reusable, using Ochratoxin A (OTA) as the test model. The OTA binding aptamer (OBA) was hybridized with the thiolated supporting sequence (TSS) immobilized on the surface of a gold electrode. The UiO-66 with a formula of [Zr6O4(OH)4(BDC)6], one of the class of Zr metal–organic frameworks (MOFs), was then particularly grafted on the terminal of OBA through the specific coordination between Zr4+ and 5′-PO43–, i.e., the Zr–O–P coordination bond. Similarly, as much as the 5′-PO43– and 3′-methylene blue dual-labeled sequences (DLS) were further assembled on UiO-66 due to the large surface area of MOF and rich active sites of Zr4+. Owing to the specific coordination for signal amplification, the developed aptasensor shows greatly enhanced sensitivity. A wide detection range from 0.1 fM to 2.0 μM and an ultralow detection limit of 0.079 fM (S/N = 3) for OTA were obtained. Additionally, the TSS can rehybridize with a new OBA to regenerate the aptasensor but without complicated pretreatments, enabling a aptasensor that is readily reusable for OTA detection. The aptasensor was successfully applied for OTA detection in the red wine samples, demonstrating a promising prospect for food safety monitoring.
科研通智能强力驱动
Strongly Powered by AbleSci AI