Citation:
HE Feng, WANG Hai-Jie, LI Teng-Fei, DU Peng-Fei, WANG Wei-Ting, WANG Shou-Jing, LIU Yao-Bo, MA Yan-Li, HU Peng, TAN Tian-Yu, HAN Qing. Magnetic Separation Immunosensor Based on Enzyme-linked Gold Nanocomposite Probe for Detection of Ractopamine[J]. Chinese Journal of Analytical Chemistry,
;2023, 51(1): 102-111.
doi:
10.19756/j.issn.0253-3820.221241
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A magnetic separation competitive immunosensor based on novel enzyme-linked gold nanocomposite probes (E-GNPs) was constructed for detection of ractopamine (RAC). Through the specific interaction between streptavidin and biotin, horseradish peroxidase (HRP) was labeled on the antibody that was modified on the surface of gold nanoparticles (AuNPs) by electrostatic assembly method to obtain E-GNPs. Ovalbumin (OVA)-RAC hapten coated magnetic beads (MBs) was introduced for a competitive reaction, and quantitative analysis of the target was achieved by a color reaction. With the change of the concentration of target molecule RAC, the color of the enzyme-catalyzed substrate changed, and the concentration of RAC had a linear relationship with the color signal intensity. The UV-vis absorption spectroscopy characterization results showed that one E-GNP could carry 11 HRP molecules, which made the immunosensor highly sensitive. The prepared sensor was successfully used for detection of RAC with a detection limit of 1.75 pg/mL, showing 10 times higher sensitivity than that of traditional ELISA method. Cross-reaction experiments showed that the sensor had good selectivity for RAC, and could be applied to real samples such as pork, beef and mutton, with spiked recoveries ranging from 88.3% to 103.4%. This analytical method provided a new idea for rapid screening of RAC in animal-derived foods.
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