Sensitive colorimetric detection of ochratoxin A by a dual-functional Au/Fe 3 O 4 nanohybrid-based aptasensor.

A novel colorimetric aptasensor based on a Au/Fe 3 O 4 nanohybrid was developed to detect ochratoxin A (OTA). The aptasensor is composed of a free OTA aptamer, a Au/Fe 3 O 4 nanohybrid coated with biotinylated complementary DNA of the OTA aptamer (biotin-cDNA-Au/Fe 3 O 4 ), and free alkaline-phosphatase-labeled streptavidin (SA-ALP). The Au/Fe 3 O 4 nanohybrid not only immobilizes biotin-cDNA but also magnetically separates SA-ALP from the sample solution. One part of the OTA aptamer sequence hybridizes with biotin-cDNA immobilized on Au/Fe 3 O 4 , and the left part of the OTA aptamer sequence covers the biotin and blocks the specific interaction between biotin and SA-ALP. OTA can interrupt the interaction of OTA aptamer binding to biotin-cDNA-Au/Fe 3 O 4 and can inhibit the shielding effect of the OTA aptamer on biotin. The amount of SA-ALP that can be captured by biotin-cDNA-Au/Fe 3 O 4 thus increases with increasing OTA concentration. Through a simple magnetic separation, the collected SA-ALP-linked Au/Fe 3 O 4 can produce a yellow-colored solution in the presence of p -nitrophenyl phosphate ( p -NPP). This colorimetric aptasensor can detect OTA as low as 1.15 ng mL -1 with high specificity.