Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, OE, School of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
J Hazard Mater. 2021 Jul 15;414:125539. doi: 10.1016/j.jhazmat.2021.125539. Epub 2021 Feb 25.
Sensitive detection of streptomycin (STR) has attracted increasing attention worldwide because of the relationship between food security and human health. In this paper, BiVOBr/TiC nanohybrids were obtained by one-pot solvent hydrothermal method. It was modified on ITO electrode, and STR aptamer was acted as the recognition element. With excellent photoelectrochemical (PEC) performance of BiVOBr/TiC nanohybrids, an "on-off-on" PEC aptasensor for STR detection was effectively developed. Compared with pure BiVOBr, the photocurrent intensity of as-prepared BiVOBr/TiC nanohybrids was about 9 times higher, which ascribed to the highly conductive of TiC, driving the photogenerated electrons transferred to the ITO electrode rapidly, so that the recombination of photogenerated electron and hole pairs was inhibited viably. Furthermore, the constructed "on-off-on" PEC aptasensor accomplished STR detection with high sensitivity, excellent specificity and distinguished repeatability in honey. The photocurrent increased with the increment of STR concentration with the linear range from1 nM to 1000 nM, and the detection limit of 0.3 nM (S/N = 3). Compared with the national standard method (SN/T 1925-2007), the as-constructed PEC sensor showed the consistent results.
由于食品安全和人类健康之间的关系，链霉素（STR）的灵敏检测在全球范围内受到越来越多的关注。本文采用一锅溶剂热法制备了 BiVOBr/TiC 纳米杂化材料。将其修饰在 ITO 电极上，并用 STR 适体作为识别元件。由于 BiVOBr/TiC 纳米杂化材料具有优异的光电化学（PEC）性能，因此有效地开发了一种用于 STR 检测的“开-关-开”PEC 适体传感器。与纯 BiVOBr 相比，所制备的 BiVOBr/TiC 纳米杂化材料的光电流强度约提高了 9 倍，这归因于 TiC 的高导电性，可迅速将光生电子转移到 ITO 电极，从而有效地抑制光生电子和空穴对的复合。此外，所构建的“开-关-开”PEC 适体传感器在蜂蜜中具有高灵敏度、优异的特异性和可区分的重复性，实现了 STR 的检测。光电流随着 STR 浓度的增加而增加，线性范围为 1 nM 至 1000 nM，检测限为 0.3 nM（S/N = 3）。与国家标准方法（SN/T 1925-2007）相比，所构建的 PEC 传感器具有一致的结果。
