Article ID Journal Published Year Pages File Type
7640116 Microchemical Journal 2018 33 Pages PDF
Abstract
Streptomycin (STR), an aminoglycoside antibiotic, was used in human and veterinary to treat gram-negative infections. STR residue causes serious side effects on human health. Accordingly, to achieve a novel and sensitive method for detection of STR, we attempted to develop electrochemical sensing system based on graphene quantum dots (GQDs) functionalized with amine (NH) and thiol (SH) groups (GQDs-N-S) as the promising newest carbon-based nanomaterial. In this sensing system, gold nanoparticle (AuNPs) was deposited on the GCE surface. Then GQDs-N-S was coated on the AuNPs/GCE surface. After, the silver nanoparticle (AgNPs) coated on the GQDs-N-S/AuNPs/GCE. Finally, the STR thiol-aptamer (SH-Apt) was covalently attached on the AgNPs/GQDs-N-S/AuNPs/GCE via bonding formation of AgS. This system showed linear range from 0.01 pg·mL−1 to 812.21 pg·mL−1 with limit of detection of 0.0033 pg·mL−1; it was as good as or better than other similar assays, and also the proposed system, in the presence of different interferences, displayed good selectivity in detecting STR. The proposed aptasensor showed excellent results in quantitatively the detection of STR in serum samples.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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