黑磷
炭黑
电化学
纳米技术
化学
检出限
材料科学
色谱法
光电子学
电极
有机化学
物理化学
天然橡胶
作者
Kunxia Li,Xiujuan Qiao,Haiyan Zhao,Yaping He,Qinglin Sheng,Tianli Yue
标识
DOI:10.1016/j.microc.2021.106378
摘要
• A label-free sensing interface was designed for the detection of Ochratoxins A . • The sensing interface is based on carbon dots-black phosphorus nanohybrid. • The satisfactory practical sensing results were obtained from wheat and grape juice. In this work, we have synthesized the novel carbon dots-black phosphorus nanohybrid (CDs-BP). And a novel label-free electrochemical aptasensor based on CDs-BP was constructed for ultrasensitive detection of Ochratoxins A (OTA). The morphology and structure of nanocomposite were analyzed by transmission electron microscope, X-ray photoelectron spectroscopy, Zeta potential, et al. The CDs-BP nanohybrid, an excellent carrier for the immobilization of aptamer (Apta), was prepared through C-P bond, resulting in the enhancement of the electrochemical sensing performance for OTA detection. The results showed that the aptasensor had a wide linear range towards OTA (0.1 fg/mL − 10.0 ng/mL) with a low detection limit of 0.03 fg/mL under the optimal conditions. The proposed aptasensor displayed good electrochemical stability and excellent selectivity to OTA detection. Moreover, a satisfactory practical application results were obtained for different actual samples of wheat and grape juice samples. Thus, a new aptasensor was raised based on the CDs-BP nanocompound for the electrochemical detection of contaminants in edible agricultural food.
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