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A SnO 2 /Bi 2 S 3 -based photoelectrochemical aptasensor for sensitive detection of tobramycin in milk.

Authors :
Liu X
Jiang Y
Luo J
Guo X
Ying Y
Wen Y
Yang H
Wu Y
Source :
Food chemistry [Food Chem] 2021 May 15; Vol. 344, pp. 128716. Date of Electronic Publication: 2020 Nov 25.
Publication Year :
2021

Abstract

Abuse of tobramycin (TOB) causes a series of diseases. Therefore, the development of rapid and sensitive method for analyzing TOB in food products is necessary. In this work, aptamer modified SnO <subscript>2</subscript> /Bi <subscript>2</subscript> S <subscript>3</subscript> -based photoelectrochemical (PEC) sensor was developed for the determination of TOB in milk. Under optimal condition, a wide linear response for TOB from 5 to 50 nmol/L with a limit of detection of 4.28 nmol/L is reached. The possible detection mechanism is that TOB molecules are specifically captured by aptamer, increasing electron transfer resistance and declining the photocurrent. Thanks to the favorably matched energy level of SnO <subscript>2</subscript> , and Bi <subscript>2</subscript> S <subscript>3</subscript> , the PEC aptasensor exhibits high sensitivity, and with the aid of oxalate, the sensitivity of the sensor is further improved. Importantly, the stability of the PEC aptasensor is also satisfactory due to the calcination of SnO <subscript>2</subscript> /Bi <subscript>2</subscript> S <subscript>3</subscript> at 450 °C.<br /> (Copyright © 2020. Published by Elsevier Ltd.)

Details

Language :
English
ISSN :
1873-7072
Volume :
344
Database :
MEDLINE
Journal :
Food chemistry
Publication Type :
Academic Journal
Accession number :
33267988
Full Text :
https://doi.org/10.1016/j.foodchem.2020.128716