Bi2S3/BiOCl heterojunction-based photoelectrochemical aptasensor for ultrasensitive assay of fumonisin B1 via signal amplification with in situ grown Ag2S quantum dots

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL Microchimica Acta Pub Date : 2024-11-26 DOI:10.1007/s00604-024-06846-8

Pengfei Yu, Meixin Li, Shun Wang, Shanshan Li, Jiaqi Cui, Jun Yang, Shuang Liu, Ling Kong, Zhiwei Chen

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Abstract

Fumonisin B₁ (FB₁) is a mycotoxin mainly found in corn, peanuts, and wheat crops, which affects human health. Based on bismuth sulfide/bismuth oxychloride (Bi₂S₃/BiOCl) composite material, silver sulfide (Ag₂S) was grown in situ as a quantum dot sensitization signal, and a photoelectrochemical (PEC) aptasensor was designed by layer upon layer modification to detect FB₁. Bi₂S₃/BiOCl has a wide range of visible light absorption, stable chemical properties, and a simple synthesis method. In the construction process, L-ascorbic acid (AA) is selected to provide electrons and inhibit photogenerated electron-hole (e^-/h⁺) recombination. Under the optimal experimental conditions, the detection range of the fabricated PEC aptasensor was 0.001 ~ 100 ng/mL, and the detection limit was 0.016 pg/mL. The prepared PEC aptasensor has high sensitivity, stability, and reproducibility. The combination of aptamer and PEC sensor provides a novel method for the application of PEC sensor in mycotoxin detection.

Graphical Abstract

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基于 Bi2S3/BiOCl 异质结的光电化学传感器，通过原位生长的 Ag2S 量子点进行信号放大，实现伏马菌素 B1 的超灵敏检测

伏马菌素 B1（FB1）是一种霉菌毒素，主要存在于玉米、花生和小麦作物中，会影响人体健康。在硫化铋/氧氯化铋（Bi2S3/BiOCl）复合材料的基础上，原位生长了硫化银（Ag2S）作为量子点敏化信号，并通过层层修饰设计了一种光电化学（PEC）传感器来检测 FB1。Bi2S3/BiOCl 对可见光的吸收范围广，化学性质稳定，合成方法简单。在构建过程中，选择了 L-抗坏血酸（AA）来提供电子并抑制光生电子-空穴（e-/h+）重组。在最佳实验条件下，所制备的 PEC 合传感器的检测范围为 0.001 ~ 100 ng/mL，检测限为 0.016 pg/mL。制备的 PEC 合传感器具有高灵敏度、高稳定性和高重现性。灵敏度高、稳定性好、重现性好，将灵敏配体与PEC传感器相结合，为PEC传感器在霉菌毒素检测中的应用提供了一种新方法。

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.